WO2024130859A1

WO2024130859A1 - Battery pack disconnect apparatus and battery pack

Info

Publication number: WO2024130859A1
Application number: PCT/CN2023/080946
Authority: WO
Inventors: 王慧; 岑鸿昌
Original assignee: 惠州亿纬锂能股份有限公司
Priority date: 2022-12-22
Filing date: 2023-03-10
Publication date: 2024-06-27
Also published as: CN219226560U

Abstract

Disclosed in the present application are a battery pack disconnect apparatus and a battery pack. The battery pack disconnect apparatus comprises a casing; a high-voltage element which is detachably connected to the casing; a copper bar which is detachably fixed on the casing and is electrically connected to the high-voltage element; and a connecting wire which is electrically connected to the copper bar and the high-voltage element. Therefore, the high-voltage element, the copper bar and the connecting wire can be quickly disassembled for replacement when being damaged, thus achieving convenience and simplicity.

Description

Battery pack circuit breaker and battery pack

This application claims priority to the Chinese patent application filed with the China Patent Office on December 22, 2022, with application number 202223473161.1. The entire contents of the above application are incorporated by reference into this application.

Technical Field

The present application relates to the field of battery technology, for example, to a battery pack circuit breaker device and a battery pack.

Background technique

BDU (Battery Disconnect Unit) is a module in electric vehicles, mainly designed for hybrid vehicles and pure electric vehicles. It protects the battery pack module in the battery box of electric vehicles. It is an important protection module for the high-voltage circuit system of electric vehicles and an important part of the vehicle control system of electric vehicles. Its role is to coordinate the function conversion and energy distribution of high-voltage accessories such as the drive motor control system, battery pack management system, charging management system, electric air conditioning, electric power steering, and braking system. In addition, it can also realize safety protection functions such as fast power-off protection for short-circuit overload and leakage protection. It makes car maintenance simpler and installation more convenient, beautifies the interior design and reduces the occupied space, makes the car battery pack life longer, and reduces the daily maintenance cost of the car.

In the related art, the architecture of BDU is that the connecting wires, copper bars and high-voltage components are fixed on the upper surface of the plastic parts by gluing or welding. This method has the following shortcomings: when the BDU is produced and assembled, the connecting wires are difficult to fix, the production efficiency is low, the labor cost is increased, and the high-voltage components are difficult to disassemble.

Summary of the invention

The embodiments of the present application provide a battery pack circuit breaker device and a battery pack, which can quickly install connecting wires and quickly replace connecting wires and high-voltage components when they are damaged.

In a first aspect, an embodiment of the present application provides a battery pack circuit breaker device, the battery pack circuit breaker device comprising:

case;

A high-voltage component, detachably connected to the housing;

A copper busbar, detachably fixed to the housing and electrically connected to the high voltage component;

A connecting wire is electrically connected to the copper bus and the high-voltage component.

In one embodiment, the high voltage component includes a fuse and a shunt, and the fuse and the shunt are detachably connected to the housing via bolts.

In one embodiment, the high voltage element comprises a relay assembly, and the relay assembly is snap-fitted and/or plug-fitted to the housing.

In one embodiment, the relay assembly includes a first relay and a second relay, the first relay is clamped at an end of the housing, and the second relay is inserted in the middle of the housing.

In one embodiment, the high-voltage element includes a pre-charging resistor, and the pre-charging resistor is snap-fitted and/or plugged into the housing.

In one embodiment, the high-voltage element includes a fuse, a shunt and a relay assembly; the fuse, the shunt and the relay assembly are arranged on one side of the housing, and the pre-charging resistor is arranged on the other side of the housing.

In one embodiment, the shell is provided with a first limiting portion and a second limiting portion, the first limiting portion forms a limiting groove, the pre-charging resistor includes a pin, the pin is inserted into the limiting groove, and the pre-charging resistor is further engaged between the second limiting portion and the shell.

In one embodiment, the first limiting portion includes a limiting body, extension walls extending from two ends of the limiting body along the same side direction, and a bent portion bent from the extension wall toward the limiting body to form the limiting groove.

In one embodiment, the second limiting portion includes:

A position-limiting support portion extending outward from the shell;

The limiting main body part extends obliquely from one end of the limiting support part away from the shell body toward the shell body, and the limiting main body part is elastic.

In one embodiment, an output-end stud is provided on the shell, and the output-end stud is fixed to the shell by a buckle, and the copper busbar is detachably fixed to the shell by the stud.

In one embodiment, the shell has a plurality of heat dissipation holes configured to dissipate heat inside the shell.

In one embodiment, the battery pack circuit breaker device further includes:

An upper cover is detachably connected to the shell to form a receiving cavity for accommodating the high-voltage component, the copper busbar and the connecting wire.

In one embodiment, the upper cover and the shell are detachably connected via a buckle.

In a second aspect, an embodiment of the present application provides a battery pack, comprising the battery pack circuit disconnecting device, wherein the battery pack circuit disconnecting device comprises the battery pack circuit disconnecting device as described above.

Beneficial effects of the present application: The present application provides a battery pack circuit breaker device and a battery pack, the battery pack circuit breaker device comprising: a shell; a high-voltage component, which is detachably connected to the shell so that it can be quickly disassembled and replaced when the high-voltage component is damaged; a copper busbar, which is detachably fixed to the shell and electrically connected to the high-voltage component, and can be quickly disassembled and replaced when the copper busbar is damaged; a connecting wire, which is electrically connected to the copper busbar and the high-voltage component, and the connecting wire can be quickly installed, and when the connecting wire needs to be replaced Can be quickly disassembled and replaced.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a battery pack circuit breaker device according to an embodiment of the present application;

FIG2 is a schematic structural diagram of a housing of a battery pack circuit breaker device according to an embodiment of the present application;

FIG3 is a schematic diagram of the structure of some components of a battery pack circuit breaker device in one embodiment of the present application;

FIG4 is an enlarged schematic structural diagram of position A shown in FIG1 ;

FIG5 is a schematic diagram of the structure of a pre-charging resistor and a housing in one embodiment of the present application;

FIG6 is a schematic structural diagram of a first limiting portion in one embodiment of the present application;

FIG. 7 is a schematic diagram of the structure of a battery pack according to an embodiment of the present application.

In the figure:
10-battery pack circuit breaker, 11-housing, 12-high voltage component, 13-copper busbar, 14-connecting wire, 110-output end stud, 111-first screw hole, 131-second screw hole, 132-screw, 141-insert, 133-terminal, 121-fuse, 122-shunt, 123-relay assembly, 124-pre-charging resistor, 1211-third screw hole, 1222-fourth screw hole, 1212-first bolt, 1221-second bolt, 12 31-first relay, 1232-second relay, 1233-card hole, 1234-installation slot, 1240-first limit part, 1248-second limit part, 1241-extension wall, 1242-limit body, 1247-bend part, 1400-limit slot, 1246-pin, 1244-limit support part, 1245-limit body, 113-heat dissipation hole, 15-upper cover, 151-upper cover body, 152-upper cover side wall, 20-battery pack

Detailed ways

In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

In the description of this application, it should be noted that, unless otherwise expressly specified, the terms "installation", "Connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

Please refer to Fig. 1, which is a schematic diagram of the structure of a battery pack disconnecting device 10 provided in an embodiment of the present application. As shown in Fig. 1, the battery pack disconnecting device 10 includes a housing 11, a high-voltage component 12, a copper bus 13 and a connecting wire 14.

The housing 11 is used to assemble and protect the high-voltage component 12, the copper busbar 13 and the connecting wire 14. The high-voltage component 12 is detachably connected to the housing 11. The copper busbar 13 is detachably fixed to the housing 11 and is electrically connected to the high-voltage component 12; the connecting wire 14 is electrically connected to the copper busbar 13 and the connecting wire 14 is electrically connected to the high-voltage component 12.

Therefore, when the high-voltage component 12, the copper busbar 13 and the connecting wire 14 are damaged, they can be quickly disassembled and replaced, which is convenient and simple.

Copper busbar 13, also known as copper busbar or copper busbar, is made of copper material, with a long conductor of rectangular or chamfered (rounded) rectangular cross section, and the chamfer is rounded. The copper busbar with rounded corners is used to avoid tip discharge, and it plays the role of transmitting current and connecting electrical equipment in the circuit. Copper busbar 13 has been widely used in electrical equipment, especially complete sets of power distribution equipment; generally, U, V, W phase busbars and PE busbars in the power distribution cabinet all use copper busbar 13; copper busbar 13 is generally marked with phase color letter signs or painted with phase color paint during use, U phase copper busbar 13 is painted "yellow", V phase copper busbar 13 is painted "green", W phase copper busbar 13 is painted "red", and PE busbar copper busbar 13 is painted "yellow and green alternating" two colors.

Please refer to Figures 2 and 3 together. In one embodiment, the copper bar 13 is detachably connected to the housing 11 through bolts and screw holes. Specifically, an output terminal stud 110 is provided on the housing 11, and the output terminal stud 110 is fixed to the housing 11 through a buckle. The housing 11 is further provided with a first screw hole 111. The first end of the copper bar 13 is provided with a second screw hole 131, and the second end is provided with a screw 132. The output terminal stud 110 is screwed into the second screw hole 131 to fix the first end of the copper bar 13 to the housing 11, and the second end of the copper bar 13 is fixed to the housing 11 through the cooperation of the first screw hole 111 and the screw 132. Among them, the output terminal stud 110 is movable, which can effectively absorb the assembly tolerance when the copper bar 13 is externally connected.

Please refer to FIG. 4 , which is an enlarged schematic diagram of the structure at A in FIG. 1 . As shown in FIGS. 1 and 4 , the connecting wire 14 is electrically connected to the high-voltage component 12 and the copper bus 13 , respectively. For example, a plug 141 is provided on the connecting wire 14 , and a terminal 133 is provided on the copper bus 13 , which are plugged in with each other to form an electrical connection. The connection between the connecting wire 14 and the high-voltage component 12 can also be set similarly.

In one embodiment, the high voltage component 12 is a high voltage, high current component in the battery pack circuit breaker. The high voltage component 12 is set as needed. In one embodiment, the high voltage component 12 includes a fuse 121, a shunt 122, a relay assembly 123, and a pre-charging resistor 124. Of course, different requirements include different electrical components. The components are different and the functions will increase accordingly.

In one embodiment, the fuse 121 is detachably connected to the housing 11 by bolts, and the shunt 122 is detachably connected to the housing 11 by bolts. Please refer to Figures 2 and 3 together. In one embodiment, a third screw hole 1211 is provided on the housing 11, and a nut is provided in the third screw hole 1211. A first bolt 1212 is provided on the fuse 121. During assembly, the first bolt 1212 is screwed into the third screw hole 1211 and tightened with the nut of the third screw hole 1211 to fix the fuse 121. Similarly, a fourth screw hole 1222 is provided on the housing 11, and a nut is provided in the fourth screw hole 1222. A second bolt 1221 is provided on the shunt 122. During assembly, the second bolt 1221 is screwed into the fourth screw hole 1222 and tightened with the nut of the fourth screw hole 1222 to fix the shunt 122.

In one embodiment, screw holes and embedded nuts are provided on the fuse 121 and the shunt 122 , and bolts or output terminals are provided on the housing 11 to fix the fuse 121 and the shunt 122 .

The relay assembly 123 is snap-fitted and/or plug-fitted with the housing 11 to achieve a detachable connection. Exemplarily, the relay assembly 123 includes a first relay 1231 and a second relay 1232, which are distinguished by position, the first relay 1231 is arranged at the end of the housing 11, and the second relay 1232 is plug-fitted and arranged in the middle of the housing 11.

In one embodiment, the first relay 1231 can be detachably connected to the housing 11 by snapping. Specifically, a snap hole 1233 is set at the end position of the housing 11. During assembly, the first relay 1231 is snapped into the snap hole 1233 to achieve a detachable connection between the first relay 1231 and the housing 11.

A mounting groove 1234 is provided in the middle of the housing 11. During assembly, the second relay 1232 is inserted into the mounting groove 1234 to fix the second relay 1232. It is understandable that, similar to the components described above, screw holes and embedded nuts may be provided on the second relay 1232, and bolts or output terminals may be provided on the housing 11 to fix the second relay 1232.

The present application makes it easy to open holes at both ends of the housing 11, for example, a clamping hole 1233 is set on the side wall of the housing 11, which is convenient for fixing the first relay 1231, simplifies assembly, and improves production efficiency. In the thicker middle part of the housing 11, since it is more troublesome to set the clamping hole, a mounting groove 1234 can be set to assemble the second relay 1232, which greatly utilizes the advantages of each part of the housing 11 to fix the relay assembly 123.

In one embodiment, the port where the relay component 123 is connected to the connecting line 14, that is, the voltage input by the connecting line 14 is low voltage, and the port where the relay component 123 is connected to the copper bus 13, that is, the voltage collection port, is high voltage.

Please refer to Figures 5 and 6 together. The pre-charging resistor 124 is detachably fixed to the housing 11 by means of snaps and/or plugging. Exemplarily, the fuse 121, the shunt 122, the relay assembly 123 and the copper bus 13 are arranged on one side of the housing 11, and the pre-charging resistor 124 is arranged on the other side of the housing 11. The high-voltage components 12 are arranged on both sides of the housing 11, so that the copper bus 13 can be isolated from part of the high-voltage components 12. The electrical equipment is safer and more reliable, and the space utilization rate is improved. The structure is compact and beautiful, and it is also beneficial for the heat of the high-voltage component 12 to be more dispersed and easy to dissipate heat.

In one embodiment, the housing 11 is provided with a first limiting portion 1240 and a second limiting portion 1248, the first limiting portion 1240 includes a limiting body 1242, an extension wall 1241 extending from both ends of the limiting body 1242 along the same side direction, and a bent portion 1247 bent from the extension wall 1241 to the limiting body 1242, so as to form a limiting groove 1400 in the first direction and the second direction, and the pre-charging resistor 124 includes a latch 1246, and the latch 1246 is inserted into the limiting groove 1400 to achieve positioning of the pre-charging resistor 124 through the limiting groove 1400. Since the limiting body 1242, the extension wall 1241 and the bent portion 1247 form a semi-enclosed structure, after the latch 1246 is inserted, the latch 1246 can be limited between the limiting body 1242 and the bent portion 1247 to achieve positioning in the first direction.

The pre-charging resistor 124 is disposed between the second limiting portion 1248 and the housing 11, and the pre-charging resistor 124 abuts against the second limiting portion 1248. In one embodiment, the second limiting portion 1248 includes: a limiting support portion 1244 extending outward from the housing 11; a limiting body portion 1245 extending obliquely toward the housing 11 from one end of the limiting support portion 1244 away from the housing 11, and the limiting body portion 1245 is elastic. That is, the limiting body portion 1245 is connected to the limiting support portion 1244 at an acute angle. The limiting body portion 1245 has elasticity that allows it to approach the limiting support portion 1244 and to be away from the limiting support portion. During installation, the pre-charging resistor 124 slides along the inclined surface of the limiting main body 1245 toward the shell 11, and is then limited by the limiting main body 1245 between the second limiting part 1248 and the shell 11, and the limiting support part 1244 and the limiting main body 1245 abut against the pre-charging resistor 124, preventing the pre-charging resistor 124 from moving in the second direction of the limiting support part 1244, and preventing the pre-charging resistor 124 from moving in the third direction of the limiting main body 1245. Since the limiting directions of the limiting support part 1244 and the limiting main body 1245 are perpendicular, the pre-charging resistor 124 is limited in the second direction and the third direction. Further, since the opening direction of the limiting groove 1400 is perpendicular to the limiting support part 1244, as described above, the limiting groove 1400 limits the pre-charging resistor 124 in the first direction of its opening, that is, limiting in three directions is achieved. In addition, since the limiting body 1245 is elastic, the assembly tolerance of the pre-charging resistor 124 can be absorbed.

In one embodiment, the housing 11 is provided with a plurality of heat dissipation holes 113, which can dissipate the heat inside the housing 11. The heat dissipation holes 113 may be arranged at intervals on the entire side wall of the housing 11, or may be concentrated at locations of the housing 11 that are prone to heat generation, such as at the location of the high-voltage component 12.

The heat dissipation holes 113 may be evenly distributed or unevenly distributed. For example, heat dissipation holes 113 with a higher density are arranged at locations prone to heat generation, and heat dissipation holes 113 with a lower density are arranged at other locations.

The sizes of the heat dissipation holes 113 may be equal or unequal. For example, a heat dissipation hole 113 with a larger diameter may be arranged at a location prone to heat generation, and a heat dissipation hole 113 with a smaller diameter may be arranged at other locations.

The battery pack disconnecting device further includes an upper cover 15. The upper cover 15 is detachably connected to the housing 11 to form a container. The upper cover 15 is a housing for the nano-high voltage element 12, the copper busbar 13 and the connecting wire 14. Specifically, the upper cover 15 includes a detachably connected upper cover body 151 and an upper cover side wall 152. The detachable upper cover body 151 and the upper cover side wall 152 are fixed to each other by snapping. As a whole upper cover, it is detachably connected to the housing 11 through a snap.

Please refer to FIG. 7 , an embodiment of the present application further provides a battery pack 20 , including the battery pack circuit breaker device 10 described above.

Claims

A battery pack circuit breaker device, comprising:

case;

A high-voltage component, detachably connected to the housing;

A copper busbar, detachably fixed to the housing and electrically connected to the high voltage component;

A connecting wire is electrically connected to the copper bus and the high voltage component.
The battery pack circuit breaker device according to claim 1, wherein the high-voltage component includes a fuse and a shunt, and the fuse and the shunt are both detachably connected to the housing by bolts.
The battery pack circuit disconnecting device according to claim 1, wherein the high-voltage element comprises a relay assembly, and the relay assembly is snap-connected and/or plugged into the housing.
The battery pack circuit breaker device according to claim 3, wherein the relay assembly includes a first relay and a second relay, the first relay is clamped on the end of the shell, and the second relay is inserted in the middle of the shell.
The battery pack circuit breaking device according to claim 1, wherein the high-voltage element comprises a pre-charging resistor, and the pre-charging resistor is snap-fitted and/or plugged into the housing.
The battery pack circuit breaker device according to claim 5, wherein the high voltage component comprises a fuse, a shunt and a relay assembly;

The fuse, the shunt and the relay assembly are arranged on one side of the housing, and the pre-charging resistor is arranged on the other side of the housing.
According to the battery pack circuit breaking device of claim 5, wherein the shell is provided with a first limiting portion and a second limiting portion, the first limiting portion forms a limiting groove, the pre-charging resistor includes a pin, the pin is inserted into the limiting groove, and the pre-charging resistor is engaged between the second limiting portion and the shell.
The battery pack circuit breaking device according to claim 7, wherein the first limiting portion includes a limiting body, an extension wall extending from both ends of the limiting body along the same side direction, and a bent portion bent from the extension wall toward the limiting body to form the limiting groove.
The battery pack circuit breaker device according to claim 7, wherein the second limiting portion comprises:

A position-limiting support portion extending outward from the shell;

The limiting main body part extends obliquely from one end of the limiting support part away from the shell body toward the shell body, and the limiting main body part is elastic.
The battery pack circuit breaker device according to claim 1, wherein an output terminal stud is provided on the shell, the output terminal stud is fixed to the shell by a buckle, and the copper busbar is detachably fixed to the shell by the stud.
The battery pack circuit breaker device according to any one of claims 1 to 10, wherein the shell has a plurality of heat dissipation holes configured to dissipate heat inside the shell.
The battery pack circuit breaker device according to any one of claims 1 to 10, wherein the battery pack circuit breaker device further comprises:

An upper cover is detachably connected to the shell to form a receiving cavity for accommodating the high-voltage component, the copper busbar and the connecting wire.
The battery pack circuit breaking device according to claim 11, wherein the upper cover is detachably connected to the shell by a snap.
A battery pack, comprising the battery pack circuit breaker device as described in claims 1-13.