JP6730033B2 - Battery pack - Google Patents

Description

The present invention relates to an assembled battery.

Conventionally, an assembled battery in which a plurality of batteries are housed in a member such as a housing is known. For example, Patent Document 1 discloses an assembled battery configured by disposing a plurality of lithium ion cells on a frame member.

Special table 2014-504440 gazette

However, the terminal cover of the battery pack disclosed in Patent Document 1 does not have a structure for arranging auxiliaries such as a relay and a current sensor, nor is it attached to a pedestal having such a structure. For this reason, the auxiliary machines such as the relay and the current sensor are independently arranged above the battery pack, so that the operating vibration generated in the relay may affect the other auxiliary machines and generate noise.

An object of the present invention made in view of such a viewpoint is to provide an assembled battery capable of absorbing operating vibration of a relay and preventing sound propagation.

In order to solve the above problems, the assembled battery according to the first aspect is
An auxiliary machine base,
A relay arranged on the auxiliary machine base,
One or more battery cells attached to the auxiliary machine pedestal via a cell holder on the opposite side of the relay,
The relay is located higher than the other parts on the auxiliary machine base,
The auxiliary machine pedestal has irregularities formed on the surface where the relay is arranged and the surface where the other parts are arranged.

The assembled battery according to the second aspect is
The auxiliary machine pedestal has ribs for preventing rotation of the relay and for fastening and reinforcing the relay.

In addition, the assembled battery according to the third aspect,
A current sensor is further arranged on the auxiliary machine pedestal, and the bus bar that electrically connects the current sensor and the relay becomes higher from the current sensor toward the relay.

In addition, the assembled battery according to the fourth aspect,
A semiconductor switching element is further arranged on the auxiliary machine base,
The auxiliary machine pedestal has ribs for insulation between a bus bar that connects the relay and the semiconductor switching element and a bus bar that connects the relay and the current sensor.

According to the assembled battery of the first aspect, the operating vibration is absorbed and the sound propagation is prevented.

Further, according to the battery pack according to the second aspect, it becomes possible to temporarily hold the relay when it is mounted on the auxiliary machine pedestal and to suppress operating vibration noise.

Further, according to the assembled battery of the third aspect, it is possible to firmly fix the current sensor and the relay to the auxiliary machine pedestal while arranging the current sensor at a position lower than the relay.

Further, according to the assembled battery of the fourth aspect, not only the busbars are insulated from each other, but also the busbars can be prevented from being unstablely rotated when the busbars are attached to the auxiliary equipment pedestal.

It is an appearance perspective view of the assembled battery concerning one embodiment of the present invention. It is a functional block diagram which shows the outline of the power supply system containing the assembled battery shown in FIG. FIG. 2 is an external perspective view of the assembled battery showing a lower case and a cell holder of the assembled battery of FIG. 1 in a transparent state. It is an exploded perspective view of the assembled battery of FIG. 2 is an external perspective view of the lower case of FIG. 1. FIG. It is a top view of the lower case of FIG. It is an external appearance perspective view of the cell holder of FIG. FIG. 8 is an external perspective view showing a state where the cell holder of FIG. 7 is attached to the lower case of FIG. 5. It is an expansion appearance perspective view of the inter-cell bus bar attached to the cell holder. It is a figure which shows typically the adhesion position of the battery cell, lower case, and cell holder in the assembled battery of FIG. It is a figure which shows typically the state before and after the engagement of the engagement claw of a cell holder and the engagement hole of a lower case. FIG. 2 is an external perspective view of an accessory base of FIG. 1. FIG. 2 is a side view of the auxiliary machine pedestal of FIG. 1 when viewed from one side. FIG. 3 is an external perspective view of an auxiliary equipment pedestal showing a state in which each component and a bus bar are attached. It is a top view of an auxiliary machine pedestal which shows the state which fixed each component and a bus bar with a nut. It is a figure which shows the mode of assembly of the whole assembled battery. It is a figure for demonstrating the assembly mode of a battery module group and an auxiliary equipment module group.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an external perspective view of an assembled battery according to an embodiment of the present invention, and is an external perspective view showing a state in which an upper case of the assembled battery is removed. However, in FIG. 1, the depiction of each component is partially simplified. For details of each part, refer to FIGS. The assembled battery 100 includes a lower case 110 that houses battery cells, a cell holder 120 that holds the battery cells housed in the lower case 110 on the side where the upper case is attached (hereinafter, also referred to as “upper surface side”), and a cell holder 120. The auxiliary machine pedestal 200 mounted on the upper surface side of the above, various parts mounted on the auxiliary machine pedestal 200, and an upper case (not shown in FIG. 1) for protecting the various parts are provided.

In the present embodiment, the battery pack 100 includes, as various components attached to the auxiliary machine pedestal 200, a MOSFET (metal oxide semiconductor field effect transistor) 210 as a semiconductor switching element, a relay 220, a current sensor 230, and a fusible link. And 240. The assembled battery 100 also includes three terminals, an SSG terminal 250, a LOAD terminal 260, and a GND terminal 270, which protrude outside the upper case when the upper case is attached.

In the present embodiment, the assembled battery 100 will be described as being mounted and used in a vehicle including an internal combustion engine, or a vehicle such as a hybrid vehicle capable of traveling with the power of both the internal combustion engine and the electric motor. The use of the battery 100 is not limited to the vehicle.

FIG. 2 is a functional block diagram showing an outline of a power supply system including the assembled battery 100 shown in FIG. The power supply system 400 includes an assembled battery 100, an alternator 410, a starter 420, a second secondary battery 430, a load 440, a switch 450, and a controller 460. The assembled battery 100 includes a first secondary battery 130 housed in the lower case 110. The first secondary battery 130, the alternator 410, the starter 420, the second secondary battery 430 and the load 440 are connected in parallel.

The assembled battery 100 includes a MOSFET 210, a relay 220, a current sensor 230, a fusible link 240, a first secondary battery 130, and a battery controller (LBC) 140. The relay 220, the current sensor 230, the fusible link 240, and the first secondary battery 130 are connected in series in this order. The MOSFET 210 is connected in series with the second secondary battery 430 and the load 440.

In the assembled battery 100, the SSG terminal 250 is connected to the alternator 410 and the LOAD terminal 260 is connected to the load 440. Also, the GND terminal 270 is used for grounding.

The relay 220 functions as a switch that connects or disconnects the first secondary battery 130 in parallel with each component outside the assembled battery 100 in the power supply system 400.

The current sensor 230 has an appropriate structure and measures the current flowing through the circuit including the first secondary battery 130 by an appropriate method.

The fusible link 240 is composed of a fuse body, a housing made of an insulating resin that houses and holds the fuse body, and a cover made of an insulating resin that covers the housing, and blows when an overcurrent occurs.

The first secondary battery 130 is composed of an assembly of battery cells 150 housed in the lower case 110 as shown in a transparent state of the lower case 110 and the cell holder 120 in FIG. Each battery cell 150 constituting the first secondary battery 130 is a secondary battery such as a lithium ion battery or a nickel hydrogen battery. The positive electrode side of the first secondary battery 130 is connected to the fusible link 240, and the negative electrode side thereof is grounded via the GND terminal 270.

The MOSFET 210 functions as a switch that connects or disconnects the second secondary battery 430 and the load 440 in parallel with other components of the power supply system 400.

The LBC 140 is connected to the first secondary battery 130 and estimates the state of the first secondary battery 130. The LBC 140 estimates, for example, the state of charge (SOC) of the first secondary battery 130.

The alternator 410 is a generator and is mechanically connected to the engine of the vehicle. The alternator 410 generates power by driving the engine. The electric power generated by the alternator 410 by driving the engine can be supplied to the first secondary battery 130, the second secondary battery 430, and the load 440 included in the assembled battery 100, the output voltage of which is adjusted by the regulator. Further, the alternator 410 can generate power by regeneration when the vehicle decelerates. The electric power regenerated by the alternator 410 is used to charge the first secondary battery 130 and the second secondary battery 430.

The starter 420 includes a starter motor, for example, and receives power supply from at least one of the first secondary battery 130 and the second secondary battery 430 to start the vehicle engine.

The second secondary battery 430 is composed of, for example, a lead storage battery and supplies electric power to the load 440.

The load 440 includes, for example, an audio system, an air conditioner, and a navigation system provided in the vehicle, and operates by consuming the supplied power. The load 440 operates by receiving power supply from the first secondary battery 130 while the engine is stopped, and operates by receiving power supply from the alternator 410 and the second secondary battery 430 while the engine is running.

The switch 450 is connected in series with the starter 420. Switch 450 connects or disconnects starter 420 in parallel with other components.

The control unit 460 controls the overall operation of the power supply system 400. The control unit 460 is configured by, for example, an ECU (Electric Control Unit or Engine Control Unit) of the vehicle. The control unit 460 controls the operations of the switch 450, the MOSFET 210, and the relay 220, respectively, to supply power by the alternator 410, the first secondary battery 130, and the second secondary battery 430, and the first secondary battery 130. Then, the second secondary battery 430 is charged.

Next, a detailed configuration of the assembled battery 100 will be described with reference to FIGS. 4 to 17. FIG. 4 is an exploded perspective view of the assembled battery of FIG. However, in FIG. 4, as in FIG. 1, the depiction of each component is partially simplified. FIG. 5 is an external perspective view of the lower case 110, and FIG. 6 is a top view of the lower case 110. FIG. 7 is an external perspective view of the cell holder 120. 7A is an external perspective view from the upper surface side of the cell holder 120, and FIG. 7B is an external perspective view from the side opposite to the upper surface side of the cell holder 120 (hereinafter, also referred to as “lower surface side”). Is. FIG. 8 is an external perspective view showing a state where the cell holder 120 is attached to the lower case 110. FIG. 9 is an enlarged external perspective view of the inter-cell bus bar 160 attached to the cell holder 120. FIG. 10 is a diagram schematically showing the bonding positions of the battery cells 150, the lower case 110 and the cell holder 120 in the assembled battery 100. FIG. 11 is a diagram schematically showing a state before and after the engagement claw 205 of the cell holder 120 and the engagement hole 115 of the lower case 110 are engaged. 12 is an external perspective view of the auxiliary machine pedestal 200, and FIG. 13 is a side view of the auxiliary machine pedestal 200 when viewed from one side. FIG. 13A is a side view of only the auxiliary machine pedestal 200, and FIG. 13B is a side view of the auxiliary machine pedestal 200 in which components such as the relay 220 are mounted. FIG. 14 is an external perspective view of the auxiliary equipment pedestal 200 showing a state in which each component and the bus bar are attached. FIG. 15 is a top view of the auxiliary machine pedestal 200 showing a state where each component and the bus bar are fixed by the nut 290. FIG. 16 is a diagram showing how the entire assembled battery is assembled, and FIG. 17 is a diagram for explaining how the battery module group and the accessory module group are assembled.

The assembled battery 100 according to the present embodiment is assembled by assembling the battery module group and the accessory module group, then assembling the battery module group and the accessory module group, and fixing the upper case. That is, since the battery module group and the auxiliary equipment module group can be separately assembled, the assembly tact and the assembly loss can be reduced.

The battery module group includes a battery cell 150, a lower case 110 that houses the battery cell 150, a cell holder 120 that holds the battery cell 150, an inter-cell bus bar 160, a total positive terminal bus bar 164, and a total negative terminal bus bar 165. , LBC140 are assembled together.

In the present embodiment, the battery cell 150 included in the assembled battery 100 has a substantially rectangular parallelepiped shape. The battery pack 100 of the present embodiment accommodates five battery cells 150, but the number of battery cells 150 that the battery pack 100 can accommodate is not limited to five. The number of the battery cells 150 that can be accommodated in the assembled battery 100 is appropriately determined according to the maximum output of the battery cells 150, the power consumed by the driven device such as the vehicle, and the like.

As shown in FIG. 5, the lower case 110 is a housing having a space 110a that can accommodate the battery cells 150 from the upper surface side. That is, the lower case 110 has a bottom surface 111 and four side surfaces 112a, 112b, 112c, and 112d, and has an opening 113 on the opposite side (that is, the upper surface side) of the bottom surface 111. In the lower case 110, the side surfaces 112a and 112c face each other, and the side surfaces 112b and 112d face each other. Hereinafter, when the four side surfaces 112a, 112b, 112c, and 112d are not distinguished, they are collectively referred to as the side surface 112. The height of the side surface 112 is lower than the height of the battery cells 150 housed in the lower case 110.

The side surfaces 112b and 112d are provided with an attachment mechanism 114 for attaching the battery pack 100 to the vehicle, outside the lower case 110 (that is, on the opposite side of the space 110a). The shape and position of the mounting mechanism 114 on the side surfaces 112b and 112d are appropriately determined according to the mounting method for the vehicle.

Further, the side surface 112 has an engaging hole 115 for engaging with the cell holder 120 on the opening 113 side. In this embodiment, each side surface 112 has three engagement holes 115 in the center of the opening 113 side and in the vicinity of both ends.

The bottom surface 111 is provided inside the lower case 110 (that is, on the side of the space 110a) with a guide 116 for indicating the position of the battery cell 150 accommodated therein and for preventing displacement of the accommodated battery cell 150. The guide 116 also has a function of maintaining a space between the battery cells 150. An insulating sheet or the like may be inserted in the space between the battery cells 150 formed by the guide 116.

The height of the guide 116 is lower than the height of the side surface 112. In this embodiment, four guides 116 are provided at equal intervals in parallel to the side surfaces 112b and 112d. That is, in the present embodiment, the lower case 110 accommodates the five battery cells 150 arranged so as to be stacked from the side surface 112b to the side surface 112d along each area of the bottom surface 111 divided by the guide 116 into five parts. To do.

Generally, in manufacturing the lower case 110, dimensional errors are less likely to occur in the side surfaces 112a and 112c without the attachment mechanism 114 than in the side surfaces 112b and 112d provided with the attachment mechanism 114. Therefore, as in the present embodiment, by disposing the battery cells 150 so as to be stacked along the direction of the side surfaces 112a and 112c, the battery cells 150 housed in the lower case 110 are arranged in the lower case 110 in the stacking direction. It is difficult to shift to.

The position and size of the guide 116 are appropriately determined according to the shape and number of the battery cells 150 housed in the lower case 110.

The battery cell 150 has a positive electrode terminal 152 and a negative electrode terminal 153 on one substantially rectangular parallelepiped cap surface 151. The cap surface 151 has a rectangular shape having long sides and short sides, and the positive electrode terminal 152 and the negative electrode terminal 153 are provided near both ends of the cap surface 151 in the long side direction. Further, in the center of the cap surface 151, a safety valve that opens to discharge the gas to the outside when gas is generated inside the battery cell 150 due to aging deterioration or thermal runaway and the pressure inside the battery cell 150 exceeds a predetermined value. 154 is provided. The battery cell 150 is housed in the lower case 110 such that the cap surface 151 projects from the opening 113, that is, the upper surface side. As shown in FIG. 4, in the lower case 110, the battery cells 150 are housed in the lower case 110 such that the positive electrode terminals 152 and the negative electrode terminals 153 of the battery cells 150 adjacent to each other are arranged in opposite directions. It

The cell holder 120 is attached to the cap surface 151 side of the battery cell 150, that is, the opening 113 side of the lower case 110.

The cell holder 120 has a substantially rectangular shape in a top view, and an outer peripheral frame 121 having a predetermined height, and inside the outer peripheral frame 121, the battery holder 150 is held from the upper surface side with the cell holder 120 engaged with the lower case 110. And a holding lid 122. The holding lid 122 holds the cap surface 151 of the battery cell 150 housed in the lower case 110 from the upper surface side.

The outer peripheral frame 121 has four side surfaces 121a, 121b, 121c, and 121d. The four side surfaces 121a, 121b, 121c, and 121d are arranged at positions corresponding to the four side surfaces 112a, 112b, 112c, and 112d of the lower case 110, respectively, in a state where the outer peripheral frame 121 and the lower case 110 are engaged with each other. It

The outer peripheral frame 121 is provided with screw hole forming portions 123 having screw holes 123a for fixing the auxiliary machine pedestal 200 to the cell holder 120 by screwing at the ends of the side surfaces 121b and 121d. The outer peripheral frame 121 is formed so as to project outward from the side surfaces 121b and 121d. In the screw hole forming portion 123, the screw hole 123a is formed so that a screw can be inserted from the upper surface side.

Further, the outer peripheral frame 121 is for screwing the bus bars (that is, the total plus copper bus bar 285 and the total minus copper bus bar 286 described later) attached to the auxiliary equipment pedestal 200 to the cell holder 120 on the upper surfaces of the side surfaces 121b and 121d. It has a screw hole 123b. The screw hole 123b is preferably provided in the vicinity of the opening 124a to which the total positive terminal bus bar 164 and the total negative terminal bus bar 165 described later are attached. The copper bus bars 285, 286 and various copper bus bars listed below may be bus bars using conductors other than copper.

The holding lid 122 has an opening 124a at a position corresponding to the positive electrode terminal 152 and the negative electrode terminal 153 of the battery cell 150 in the engaged state of the cell holder 120 and the lower case 110. That is, as shown in FIG. 8, in the engaged state of the cell holder 120 and the lower case 110, the positive electrode terminal 152 and the negative electrode terminal 153 of the battery cell 150 are exposed from the opening 124a to the upper surface side of the holding lid 122. ..

Further, the holding lid 122 has an opening 124b at a position corresponding to the safety valve 154 of the battery cell 150 in the engaged state of the cell holder 120 and the lower case 110. That is, as shown in FIG. 8, in the engaged state of the cell holder 120 and the lower case 110, the gas discharged from the safety valve 154 is discharged to the outside of the battery cell 150 through the opening 124a.

The positive electrode terminal 152 and the negative electrode terminal 153 exposed from the opening 124a and aligned in a line are adjacent to each other except for the positive electrode terminal 152 connected to the fusible link 240 and the negative electrode terminal 153 connected to the GND terminal 270. Are electrically connected by the inter-cell bus bar 160. The inter-cell bus bar 160 is made of a conductive metal such as aluminum. The inter-cell bus bar 160 has a convex portion 161 for avoiding interference with the frame portion 122a of the holding lid 122 between the openings 124a in a state where the bus bar 160 is attached to the cell holder 120 and connected to the positive electrode terminal 152 and the negative electrode terminal 153. Have. That is, the inter-cell bus bar 160 is projected from the terminal connection portion 162, which connects the two terminal connection portions 162 connected to the positive electrode terminal 152 and the negative electrode terminal 153 and the two terminal connection portion 162, to the upper surface side in a side view. And a convex portion 161.

The terminal connecting portion 162 has a welding opening 162a at the center, for example, as shown in FIG. The inter-cell bus bar 160 and a total positive terminal bus bar 164 and a total negative terminal bus bar 165, which will be described later, are connected to each terminal of the battery cell 150 by bead welding at the peripheral edge of the welding opening 162a.

Further, each terminal connecting portion 162 has a voltage sensor mounting terminal 163 that projects toward the opening 124b when mounted on the cell holder 120. Each voltage sensor mounting terminal 163 has a screw hole 163a. In the inter-cell bus bar 160, each voltage sensor attachment terminal 163 is arranged on the screw hole forming portion 126 described later when the terminal connecting portion 162 of the inter-cell bus bar 160 is connected to the positive electrode terminal 152 or the negative electrode terminal 153. Is formed in. The screw hole 163a overlaps with the screw hole 126a formed in the screw hole forming portion 126 when the voltage sensor mounting terminal 163 is arranged on the screw hole forming portion 126, and the screw hole 126a and the screw hole 126a are screwed by the LBC 140 screwing. It is screwed together with the hole 163a. The voltage sensor mounting terminal 163 is connected to the voltage sensor and is used to detect the voltage between the terminals.

Further, the positive terminal 152 connected to the fusible link 240 is connected to the total positive terminal bus bar 164, and the negative terminal 153 connected to the GND terminal 270 is connected to the total negative terminal bus bar 165. The total positive terminal bus bar 164 and the total negative terminal bus bar 165 are made of a conductive metal such as aluminum. The total positive terminal bus bar 164 and the total negative terminal bus bar 165 have one terminal connecting portion 162 and an external connecting portion 166 for connecting to the total positive copper bus bar 285 and the total negative copper bus bar 286 provided in the auxiliary machine base 200, respectively. Have. The external connection portion 166 has a convex shape protruding toward the upper surface side of the terminal connection portion 162 so as to sandwich the inner surface and the outer surface of the outer peripheral frame 121. In particular, as shown in FIG. 16, the external connection portion 166 is attached along the bus bar support portion 123c formed over the inner surface and the outer surface of the outer peripheral frame 121. Further, the external connection portion 166 has a screw hole 166a at a position corresponding to the screw hole 123b in a state of being attached to the outer peripheral frame 121. The terminal connecting portions 162 of the total positive terminal bus bar 164 and the total negative terminal bus bar 165 also have the voltage sensor mounting terminal 163 protruding toward the opening 124b when mounted on the cell holder 120.

The holding lid 122 prevents the electrical connection between the bus bars between the inter-cell bus bars 160 attached to the cell holder 120, and between the inter-cell bus bar 160 and the total positive terminal bus bar 164 or the total negative terminal bus bar 165. And a bead 125 for positioning the bus bar. The bead 125 projects to the upper surface side of the holding lid 122.

In addition, the holding lid 122 includes a screw hole forming portion 126 for fixing the LBC 140 on the upper surface side. The screw hole forming portion 126 is formed between the opening 124a and the opening 124b on the upper surface side of the holding lid 122. That is, in this embodiment, the holding lid 122 includes ten screw hole forming portions 126. The screw hole forming portion 126 has a substantially columnar shape, and has a screw hole 126a at the center. The LBC 140 is placed on the upper surface side of the cell holder 120, and is screwed to the cell holder 120 from the upper surface side by using the screw holes 126a formed in the screw hole forming portion 126.

Further, the holding lid 122 is provided with a rib 127 on the lower surface side for preventing the displacement of the battery cells 150 housed in the lower case 110. Four ribs 127 are provided at equal intervals in parallel to the side surfaces 121b and 121d. That is, the rib 127 of the holding lid 122 is provided in the direction and position corresponding to the guide 116 of the lower case 110 when the cell holder 120 and the lower case 110 are engaged with each other.

The outer peripheral frame 121 has an engaging insertion portion 121e having a predetermined height over the entire circumference. The engagement insertion portion 121e is thinner than other portions of the outer peripheral frame 121, and therefore, the outer surface of the outer peripheral frame 121 has the engagement insertion portion 121e that is smaller than the other portions of the outer peripheral frame 121. It is hollow. As shown in FIG. 11B, the engagement insertion portion 121e is inserted inside the lower case 110 on the opening 113 side of the lower case 110 when the cell holder 120 is engaged with the lower case 110.

On each of the side surfaces 121a, 121b, 121c and 121d, the engagement insertion portion 121e includes three engagement claws 128 in the center and near both ends. The engagement claw 128 is provided at a position corresponding to the engagement hole 115 of the lower case 110. When the cell holder 120 and the lower case 110 are engaged with each other, the engaging claw 128 of the cell holder 120 is fitted into and engaged with the engaging hole 115 of the lower case 110, so that the cell holder 120 and the lower case 110 are engaged with each other. Are combined. The positions and the numbers of the engagement holes 115 and the engagement claws 128 are not limited to the examples shown in the present embodiment, and can be determined as appropriate positions and numbers.

Further, the outer peripheral frame 121 is provided with an engagement hole 129a on the upper surface side of the side surfaces 121a and 121c and near the screw hole 123b. The engagement hole 129a is provided so as to project from the outer peripheral frame 121 to the outside, and is a substantially rectangular hole in a top view. The engagement hole 129a is used when the cell holder 120 and the auxiliary machine pedestal 200 are assembled.

Further, the outer peripheral frame 121 is provided with an engagement hole 129b on the upper surface side near the center of each of the side surfaces 121a, 121b, 121c and 121d. The engagement hole 129b is provided so as to project from the outer peripheral frame 121 to the outside, and is a substantially rectangular hole in a top view. The engagement hole 129b is used when assembling the cell holder 120 and the upper case. The engagement hole 129b does not necessarily have to be provided near the center of each of the side surfaces 121a, 121b, 121c, and 121d, and may be provided at any position as long as it can be engaged with the upper case described later. May be.

Here, the assembly of the battery module group will be described. First, an adhesive is applied to the battery cell 150. The adhesive is any adhesive that can adhere the battery cell 150 to the lower case 110 and the cell holder 120, and for example, an epoxy adhesive can be used. When the cell holder 120 and the lower case 110 are engaged with each other, the position of the battery cell 150 may be fixed in the lower case 110. Therefore, the adhesive may not necessarily be applied to the entire battery cell 150. Alternatively, it may be applied to a part of the battery cell 150. For example, the adhesive may be a surface of the battery cell 150 that comes into contact with the bottom surface 111 when the battery cell 150 is inserted into the lower case 110 (that is, a surface opposite to the cap surface 151) and a surface of the cell holder 120 from the upper surface side. It may be applied to the surface (that is, the cap surface 151) that contacts the holding lid 122 when holding 150. Particularly, since the cap surface 151 has the positive electrode terminal 152, the negative electrode terminal 153, and the safety valve 154, the positive electrode terminal 152, the negative electrode terminal 153, and the safety valve 154 are prevented from being coated with adhesive, for example, the cap surface 151. The adhesive may be applied only to the peripheral edge in the longitudinal direction.

10 shows a surface of the battery cell 150 that contacts the bottom surface 111 when the battery cell 150 is inserted into the lower case 110 and a surface that contacts the holding lid 122 when the battery holder 150 holds the battery cell 150 from the upper surface side. It is a figure which shows typically the adhesion position when an adhesive agent is applied to (that is, the cap surface 151). FIG. 10 is a cross-sectional view taken along the line AA of FIG. 8, and shows only the central battery cell 150 and its periphery among the five stacked battery cells 150. Further, in FIG. 10, the region to which the adhesive is applied is shown by shading. In this case, as shown in FIG. 10, the battery cell 150 is bonded to the cell holder 120 around the intersection of the holding lid 122 and the rib 127, and is bonded to the lower case 110 at the bottom surface 111.

In addition, what is applied between the battery cell 150 and the bottom surface 111 of the lower case 110 is not limited to the adhesive. Another filler may be applied between the battery cell 150 and the bottom surface 111. It is preferable that the filler has elasticity. By applying a filler having elasticity between the battery cell 150 and the bottom surface 111, the filler absorbs vibration generated when the vehicle including the assembled battery 100 travels, and thus the vibration is less likely to be transmitted to the battery cell 150.

Next, with the cell holder 120 turned upside down, the cap surface 151 of the battery cell 150 faces downward, and the battery cell 150 is inserted into the lower surface side of the holding lid 122 of the cell holder 120 according to the rib 127. Then, with the lower case 110 turned upside down, the lower case 110 is engaged with the cell holder 120 by covering the cell holder 120 in which the battery cell 150 is inserted. At this time, as shown in FIGS. 11A and 11B, the engagement claw 128 of the cell holder 120 is engaged with the engagement hole 115 of the lower case 110. FIG. 8 shows an example of a state in which the cell holder 120 and the lower case 110 are engaged with each other.

The procedure for bonding the battery cells 150 is not limited to the above procedure. For example, the battery cell 150 may be inserted into the space 110a of the lower case 110 without turning the lower case 110 and the cell holder 120 upside down, and the cell holder 120 may be engaged with the lower case 110 from above.

Then, the inter-cell bus bar 160, the total positive terminal bus bar 164, and the total negative terminal bus bar 165 are attached to each terminal of the battery cell 150 exposed from the opening 124a of the holding lid 122 by bead welding, and the LBC 140 is attached to the holding lid 122. This completes the assembly of the battery module group. The LBC 140 is attached to the holding lid 122 by screwing, for example, as described above.

Next, the auxiliary machine module group of the battery pack 100 according to the present embodiment will be described. The auxiliary equipment module group electrically connects the auxiliary equipment pedestal 200, the MOSFET 210, the relay 220, the current sensor 230, and the fusible link 240 arranged on the auxiliary equipment pedestal 200, and each component arranged on the auxiliary equipment pedestal 200. It is configured by assembling a copper bus bar for connecting to.

The auxiliary machine pedestal 200 has four side surfaces 200a, 200b, 200c and 200d and a mounting surface 201. The four side surfaces 200a, 200b, 200c, and 200d are the four side surfaces 112a, 112b, 112c, and 112d of the lower case 110 (and the four side surfaces of the cell holder 120, respectively) when the auxiliary machine pedestal 200 is assembled to the battery module group. 121a, 121b, 121c and 121d).

On the mounting surface 201, a current sensor 230 is mounted near the side surface 200a, a MOSFET 210 is mounted near the side surface 200b, a relay 220 is mounted near the side surface 200c, and a fusible link 240 is mounted near the side surface 200d. .. As shown in FIG. 12, unevenness is formed on the mounting surface 201 according to the positions where the MOSFET 210, the relay 220, the current sensor 230, and the fusible link 240 are mounted. The mounting surface 201 has higher rigidity than the case where there is no unevenness due to the unevenness.

In the present embodiment, as for the unevenness of the mounting surface 201, as shown in FIG. 12, a region 201c where the relay 220 is mounted, a region 201a where the current sensor 230 is mounted, and the MOSFET 210 are mounted on the mounting surface 201. It is formed so as to be at a higher position when the assembled battery 100 is assembled, as compared with the area 201b where the battery is placed and the area 201d where the fusible link 240 is placed. Further, the unevenness of the mounting surface 201 is formed such that the region 201d on which the fusible link 240 is mounted is higher than the regions 201a and 201b when the battery pack 100 is assembled. There is. Alternatively, the region 201d may be formed to have the same height as the region 201b. That is, the unevenness of the mounting surface 201 is formed such that the region 201a on which the current sensor 230 is mounted is located lower than the regions 201c and 201d. Since the mounting surface 201 has such unevenness, the fusible link 240 is arranged at a position lower than the relay 220 on the auxiliary machine pedestal 200, and the current sensor 230 thicker than the fusible link 240 and the relay 220 are arranged. It can be placed in a lower position. Therefore, the relay 220 that generates the operating vibration is arranged at a higher position than other components (the MOSFET 210, the current sensor 230, and the fusible link 240), and the one or more battery cells 150 that are heavier than the relay 220 and the other components. Will be placed below these. Therefore, since relay 220 is arranged at a position relatively far from battery cell 150 (mass), operating vibration is not directly transmitted to battery cell 150. That is, the operating vibration of the relay 220 is absorbed and the propagation of the operating vibration sound is prevented. Further, since the thickest current sensor 230 among the MOSFET 210, the current sensor 230, and the fusible link 240 is arranged at the lowest position on the auxiliary machine pedestal 200, the current sensor 230 projects upward as compared with other auxiliary machines after assembly. do not do. Therefore, it is possible to prevent the assembled battery 100 from becoming high.

The current sensor 230, the MOSFET 210, the relay 220, and the fusible link 240 are formed by the standing wall formed by the unevenness of the mounting surface 201 or the rib 202 formed on the mounting surface 201 in the regions 201a, 201b, 201c, and 201d, respectively. Is positioned.

In the present embodiment, as shown in, for example, FIGS. 12 and 14, the region 201c is partially surrounded by the rib 202. That is, the relay 220 is positioned by the rib 202. The rib 202 of the auxiliary machine base 200 also has a function of preventing rotation (positioning) when fixing the relay 220 to the auxiliary machine base 200 with the nut 290 and a function of fastening and reinforcing the relay 220. In FIG. 14, auxiliary machine base 200 has rib 202 between copper bus bar 281 connecting relay 220 and current sensor 230, and copper bus bar 282 connecting relay 220 and MOSFET 210. The rib 202 has a function of preventing the copper bus bar 281 and the copper bus bar 282 from rotating. The rib 202 also has an insulating function of preventing contact between copper bus bars described later. For example, the rib 202 also has a function of insulating the copper bus bar 281 and the copper bus bar 282. Since the rib 202 is provided between the copper bus bar 281 and the copper bus bar 282 in this way, the vicinity of the center of the auxiliary machine pedestal 200 has a protruding shape.

Further, the MOSFET 210, the relay 220, and the fusible link 240 are positioned by the standing walls formed in parts around the regions 201a, 201b, and 201d, respectively. The standing wall on the mounting surface 201 also has a function of preventing rotation when the MOSFET 210, the relay 220, and the fusible link 240 are fixed to the accessory base 200 by the nut 290.

Further, the auxiliary machine pedestal 200 includes a plurality of upward facing studs 203 on the mounting surface 201. The studs 203 are used to electrically connect the battery cells 150 of the battery module group, the MOSFET 210, the relay 220, the current sensor 230, and the fusible link 240 to each other. Moreover, the SSG terminal 250, the LOAD terminal 260, and the GND terminal 270 also extend upward from the mounting surface 201 and function as studs.

The studs 203, the SSG terminal 250, the LOAD terminal 260, and the GND terminal 270 are provided at appropriate heights on the mounting surface 201 having irregularities. For example, each stud 203 has a height corresponding to each terminal of the current sensor 230, the MOSFET 210, the relay 220, and the fusible link 240 that are respectively mounted on the mounting surface 201 in the regions 201a, 201b, 201c, and 201d. It is provided. That is, the diameter of each stud 203 is sized according to the connection opening provided in each terminal of the current sensor 230, the MOSFET 210, the relay 220, and the fusible link 240, and the current sensor 230, the MOSFET 210, and the relay 220. The fusible link 240 and the fusible link 240 are attached to the auxiliary machine pedestal 200 by passing the studs 203 through the connection openings of the terminals from the upper surface side. By making the studs 203 face up in this manner, it is easy to attach each component to the auxiliary machine pedestal 200 by automation or the like, and temporary fixing is possible. Therefore, the productivity of the auxiliary machine module and the assembled battery 100 is improved. improves.

Further, in the present embodiment, the GND terminal 270 is provided at a position lower than the SSG terminal 250 and the LOAD terminal 260. In this way, by changing the heights of the GND terminal 270 and the SSG terminal 250 and the LOAD terminal 260, the distinguishability of the GND terminal 270 is improved, so that incorrect wiring is prevented when the assembled battery 100 is mounted in a vehicle. It will be easier.

Here, the wiring of each component using the copper bus bar on the auxiliary machine pedestal 200 will be described. As shown in FIGS. 14 and 15, the copper bus bars 280 to 284 have various shapes depending on the position where they are arranged along the unevenness of the mounting surface 201 of the accessory base 200.

The terminal 240b of the fusible link 240 is electrically connected to the terminal 230a of the current sensor 230 via the copper bus bar 280. The other terminal 230b of the current sensor 230 is electrically connected to the terminal 220a of the relay 220 via the copper bus bar 281. The copper bus bar 281 that electrically connects the current sensor 230 and the relay 220 is a stepped bus bar having a bent shape as illustrated. That is, the copper bus bar 281 rises from the other terminal 230b of the current sensor 230 toward the relay 220 arranged at a position higher than the other terminal 230b. The terminal 220b of the relay 220 is electrically connected to the positive terminal 210a of the MOSFET 210 via the copper bus bar 282. Terminal 220b of relay 220 is further electrically connected to SSG terminal 250 via copper bus bars 282 and 283. The other terminal 210b of the MOSFET 210 is electrically connected to the LOAD terminal 260 via the copper bus bar 284.

The terminal 240a of the fusible link 240 is connected to a total positive copper bus bar 285 for electrically connecting to the total positive terminal bus bar 164 of the battery module group. Further, the GND terminal 270 is connected with a total negative copper bus bar 286 for electrically connecting to the total negative terminal bus bar 165 of the battery module group. The total plus copper bus bar 285 and the total minus copper bus bar 286 extend to the lower surface side along the side surfaces 200b and 200d, respectively, and the tips thereof are respectively the total plus terminals in the state where the accessory base 200 and the cell holder 120 are assembled. By making contact with the bus bar 164 and the total negative terminal bus bar 165, electrical connection is secured. The total plus copper bus bar 285 and the total minus copper bus bar 286 have screw holes at positions corresponding to the screw holes 123b provided in the cell holder 120 in a state in which the auxiliary machine pedestal 200 and the cell holder 120 are assembled at the tips thereof. 285a and 286a.

The copper bus bars 280 to 284 and the total plus copper bus bar 285 are fixed to the auxiliary machine pedestal 200 together with the MOSFET 210, the relay 220, the current sensor 230, and the fusible link 240 by a nut 290 screwed into the stud 203 from the upper surface side. .. In addition, the relay 220 can be mounted on the auxiliary machine base 200 by passing an opening 221 provided at a position different from the terminals 220a and 220b through the stud 203 and screwing a nut 290 onto the stud 203 from the upper surface side. Fixed.

As described above, the copper bus bars are arranged so as not to come into contact with each other by the ribs 202 provided on the auxiliary machine pedestal 200. Further, the partition walls 222 provided on the terminals 220a and 220b of the relay 220 also have a function of insulating the copper bus bars from contact with each other.

The auxiliary machine pedestal 200 includes screw hole forming portions 204 having screw holes 204a for fixing the cell holder 120 and the auxiliary machine pedestal 200 by screwing at the ends of the side surfaces 200b and 200d. The screw hole 204a is provided at a position corresponding to the screw hole 123a provided in the cell holder 120 in a state where the cell holder 120 and the accessory base 200 are assembled.

In addition, the auxiliary machine pedestal 200 is provided with engaging claws 205 in the vicinity of the stud 203 to which the total plus copper bus bar 285 of the side surface 200a is attached and in the vicinity of the GND terminal 270 of the side surface 200c to which the total minus copper bus bar 286 is attached. The engaging claw 205 is provided at a position corresponding to the engaging hole 129a in a state where the cell holder 120 and the auxiliary machine pedestal 200 are assembled. The engaging claw 205 extends in the lower surface direction from the outside of the side surfaces 200a and 200c, and the tip of the engaging claw 205 has a wedge shape in a side view. By fitting the tip of the engaging claw 205 into the engaging hole 129a, the engaging claw 205 and the engaging hole 129a are engaged with each other.

Here, the assembly of the accessory module group will be described. In assembling the accessory module group, first, each component (that is, MOSFET 210, relay 220, current sensor 230, fusible link 240) and copper bus bar (that is, copper bus bar 280 to 284, total plus copper bus bar 285 and total minus copper). The bus bar 286) is arranged so as to pass through the stud 203, the SSG terminal 250, the LOAD terminal 260, and the GND terminal 270 of the mounting surface 201 of the accessory base 200. Then, the stud 203, the SSG terminal 250, the LOAD terminal 260 and the GND terminal 270 are screw-fitted with the nut 290 from the upper surface side to assemble the accessory module group.

Next, the upper case will be described. As shown in FIG. 16, the upper case 300 has three openings 310a and 310b for exposing the SSG terminal 250, the LOAD terminal 260, and the GND terminal 270 to the outside from the upper case 300 when the assembled battery 100 is assembled. And 310c.

In addition, the upper case 300 includes engagement claws 320 for engaging the cell holder 120 on the lower surfaces of the four side surfaces. The engaging claw 320 is provided at a position corresponding to the engaging hole 129b when the cell holder 120 and the upper case 300 are assembled. The engaging claw 320 extends in the lower surface direction from the outer side of each side surface, and the tip of the engaging claw 320 has a wedge shape in a side view. The engagement claw 320 and the engagement hole 129b are engaged with each other by fitting the tip of the engagement claw 320 into the engagement hole 129b.

In addition, the upper case 300 includes a bus bar protection part 330 for protecting the total plus copper bus bar 285 and the total minus copper bus bar 286 in a state where the cell holder 120 and the upper case 300 are assembled.

Next, the assembly of the entire assembled battery 100 will be described. First, the assembly of the battery module group and the accessory module group will be described. The battery module group and the accessory module group are assembled by assembling the cell holder 120 and the accessory pedestal 200.

The cell holder 120 and the auxiliary machine pedestal 200 are assembled by fitting the engaging claw 205 into the engaging hole 129a and engaging them. Further, the cell holder 120 and the auxiliary machine pedestal 200 are different from each other in that, with the auxiliary machine pedestal 200 placed on the cell holder 120, the bolt 340 is screwed into the screw hole 285a or the screw hole 286a from the outside of the side surfaces 200b and 200d. It is assembled by penetrating through the hole 166a and being screwed into the screw hole 123b. That is, the cell holder 120 and the accessory base 200 are indirectly assembled by the bolt 340 via the total plus copper bus bar 285 and the total minus copper bus bar 286. At this time, the support portion 206 provided along the total plus copper bus bar 285 and the total minus copper bus bar 286 has a function of preventing rotation.

As described above, by performing the assembling by both the assembling by the engagement and the assembling by the bolt 340, more robust assembling can be realized as compared with the case of assembling on the one hand.

In addition, as shown in FIG. 17, the cell holder 120 and the auxiliary machine pedestal 200 have a screw hole 204a which penetrates the bolt 350 from the upper surface side in a state where the cell holder 120 is mounted on the auxiliary machine pedestal 200, and the screw hole It is assembled by being screwed to 123a.

Since the battery module group and the accessory module group of the present embodiment are assembled as described above, the battery module group and the accessory module group are fixed at the four corners of the accessory pedestal 200 that is substantially rectangular in a top view. .. As a result, robust assembly can be realized.

Next, the assembling of the upper case 300 will be described. The upper case 300 is engaged with the cell holder 120 by fitting the engaging claws 320 into the engaging holes 129b of the cell holder 120 and engaging them. In this way, the upper case 300 is engaged with the cell holder 120, whereby the assembly of the entire assembled battery 100 is completed.

As described above, according to the battery pack 100 according to the embodiment of the present invention, the relay 220 that generates the operating vibration is disposed on the auxiliary machine base 200 at a position higher than other components. The one or more battery cells 150 are arranged below the relay 220 and the other components. For this reason, since the relay 220 is arranged at a position relatively far from the battery cell 150, the operating vibration is not directly transmitted to the battery cell 150 (mass). That is, the operating vibration generated by the relay 220 is absorbed and the propagation of sound is prevented.

As described above, according to the battery pack 100 according to the embodiment of the present invention, the auxiliary machine pedestal 200 has the ribs for preventing the relay 220 from rotating and for strengthening and fastening the relay. For this reason, the relay 220 is firmly fixed to the auxiliary machine pedestal 200, so that the relay 220 can be prevented from coming off the auxiliary machine pedestal 200 and the operating vibration noise can be suppressed.

As described above, according to the assembled battery 100 of the embodiment of the present invention, the current sensor 230 is further arranged on the auxiliary machine pedestal 200, and the copper bus bar 281 that electrically connects the current sensor 230 and the relay 220 is provided. It increases from the current sensor 230 toward the relay 220. Therefore, it is possible to firmly fix the current sensor 230 and the relay 220 to the auxiliary machine pedestal 200 while arranging the current sensor 230 at a position lower than the relay 220.

As described above, according to the battery pack 100 according to the embodiment of the present invention, the MOSFET 210 is further arranged on the auxiliary machine pedestal 200, and the auxiliary machine pedestal 200 connects the relay bus 2202 to the copper bus bar 282. And a rib 202 for insulation between the relay 220 and the copper bus bar 281 connecting the current sensor 230. Therefore, not only the copper bus bar 281 and the copper bus bar 282 are insulated, but also the copper bus bar 281 and the copper bus bar 282 can be prevented from being unstablely rotated.

100 assembled battery 110 lower case 110a space 111 bottom surface 112, 112a, 112b, 112c, 112d, 121a, 121b, 121c, 121d, 200a, 200b, 200c, 200d side surface 113, 124a, 124b, 221, 310a, 310b, 310c opening 114 Mounting Mechanism 115, 129a, 129b Engagement Hole 116 Guide 120 Cell Holder 121 Outer Perimeter Frame 121e Engagement Insertion Part 122 Holding Lid 122a Frame Part 123, 126, 204 Screw Hole Forming Part 123a, 123b, 126a, 163a, 166a, 204a, 285a, 286a Screw hole 123c Bus bar support portion 125 Bead 127, 202 Rib 128, 205, 320 Engaging claw 130 First secondary battery 140 LBC (battery controller)
150 Battery cell 151 Cap surface 152, 210a, 220a, 230a, 240a Terminal 153, 210b, 220b, 230b, 240b Terminal 154 Safety valve 160 Inter-cell bus bar 161 Convex part 162 Terminal connection part 162a Welding opening 163 Voltage sensor mounting terminal 164 Total Positive terminal bus bar 165 Total negative terminal bus bar 166 External connection part 200 Auxiliary machine base 201 Mounting surface 201a, 201b, 201c, 201d Region 203 Stud 206 Support part 210 MOSFET (semiconductor switching element)
220 relay 222 bulkhead 230 current sensor 240 fusible link 250 SSG terminal 260 LOAD terminal 270 GND terminal 280, 281, 282, 283, 284 Copper bus bar (bus bar)
285 total plus copper bus bar (bus bar)
286 Total Minus Copper Bus Bar (Bus Bar)
290 Nut 300 Upper Case 330 Busbar Protection 340, 350 Volt 400 Power Supply System 410 Alternator 420 Starter 430 Second Secondary Battery 440 Load 450 Switch 460 Control Unit

Claims (4)

An auxiliary machine base,
A relay arranged on the auxiliary machine base,
One or more battery cells attached to the auxiliary machine pedestal via a cell holder on the opposite side of the relay,
The relay is located higher than the other parts on the auxiliary machine base,
The auxiliary equipment pedestal is an assembled battery in which irregularities are formed on the arrangement surface of the relay and the arrangement surface of the other component. The assembled battery according to claim 1,
The assembled battery, wherein the auxiliary machine pedestal has ribs for preventing rotation of the relay and for fastening and reinforcing the relay. The assembled battery according to claim 1,
An assembled battery in which a current sensor is further arranged on the auxiliary machine pedestal, and a bus bar electrically connecting the current sensor and the relay increases from the current sensor toward the relay. The assembled battery according to claim 3 ,
A semiconductor switching element is further arranged on the auxiliary machine base,
The assembled battery, wherein the auxiliary machine pedestal has a rib for insulation between a bus bar connecting between the relay and the semiconductor switching element and a bus bar connecting between the relay and the current sensor.