JP2011070872A - Battery module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery module capable of cooling a high temperature gas ejected from a battery caused by short circuiting or the like quickly to a safe temperature, to be discharged to an outside of the battery module. <P>SOLUTION: This battery module 100 includes a battery block 122 for connecting two-dimensionally battery packs 121 connected with the plurality of batteries 120, a casing 101 having a storage part 102 for storing the battery block 122 and having an opening end in at least one side, a substrate 130 for covering the opening end and having a through hole 131 corresponding to an electrode part 123 of each battery 120, a partitioning member 140 for forming a plurality of exhausting passages 141 and having an exhaust hole 143 in at least one end, and a lid body 150 for covering the partitioning member 140, and the partitioning member 140 includes one or more of ventilation holes for communicating the plurality of exhausting passages 141 each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a battery module that can reduce a high-temperature gas ejected from a battery to a safe temperature due to a malfunction or the like and discharge it to the outside of the battery module.

  In recent years, demand for secondary batteries such as nickel metal hydride, nickel cadmium, and lithium ion that can be repeatedly used is increasing from the viewpoint of resource saving and energy saving. Among these, lithium ion secondary batteries are characterized by high electromotive force and high energy density while being lightweight. For this reason, there is an increasing demand for power sources for driving various types of portable electronic devices such as mobile phones, digital cameras, video cameras, laptop computers, and mobile communication devices.

On the other hand, in order to reduce the amount of fossil fuel used and the amount of CO ₂ emitted, there is an increasing expectation for a battery module as a power source for driving a motor of an automobile or the like. This battery module is composed of two or more batteries in order to obtain a desired voltage and capacity.

  In the development of the battery module, as the capacity of the battery constituting the battery unit increases, the battery itself may generate heat and become high temperature depending on the form of use. Therefore, not only the safety of the battery itself, but also the safety of the battery module that combines the battery units that are assembled with each other is more important. That is, in the battery, the internal pressure increases due to gas generated by overcharge, overdischarge, internal short circuit or external short circuit, and in some cases, the battery outer case may burst. Therefore, in general, the battery is provided with a vent mechanism for venting gas, a safety valve, and the like to release the internal gas. At this time, there are cases where smoke is emitted due to ignition of the exhausted gas, or in rare cases, ignition occurs, and there are problems in reliability and safety. In particular, in a battery unit in which a plurality of batteries are integrated, there is a high possibility that the abnormal heat generation of one battery will cause abnormal heating to the surrounding batteries or cause a chain of fires, etc. It is important to prevent

  As means for coping with the above problems, for example, a configuration in which an exhaust duct is provided in a battery module and the generated gas is discharged to the outside through the exhaust duct is disclosed (for example, Patent Document 1). In addition, a configuration is disclosed in which a thermal expansion member is disposed in the gap between the battery pack case and the battery, and the battery that has generated heat is isolated by expansion of the thermal expansion member when the battery generates heat and ignites ( For example, Patent Document 2).

JP 2008-117765 A International Publication No. 2008/047721

  However, for example, according to Patent Document 1, the configuration in the battery module is complicated because the battery module includes the exhaust duct as a separate member. In addition, the battery module itself is increased in size, and it is difficult to reduce the size of the module itself.

  Further, according to Patent Document 2, for example, a battery that has generated heat and ignited is isolated, but the inside of the battery pack becomes high temperature, so there is a concern that it may be burned into other batteries.

  The present invention solves the above-described problems, and provides a battery module that sufficiently reduces high-temperature gas generated due to a battery failure to a safe temperature and exhausts the gas outside the pack.

  The battery module according to the present invention covers a battery block that two-dimensionally connects assembled batteries that connect a plurality of batteries, a housing that has a storage portion that stores the battery block, and has an open end in at least one of the battery blocks. A substrate having a through-hole corresponding to the electrode portion of the battery, a partition member that forms a plurality of exhaust passages and has an exhaust hole at one end, and a lid that covers the partition member, and the partition member includes a plurality of exhaust passages It has one or more air holes that communicate with each other.

  With this configuration, even if a hot gas is generated from the battery due to a malfunction of the battery, etc., a safe temperature can be obtained by using adiabatic expansion by passing through a plurality of exhaust passages connected by one or more vent holes. The gas temperature can be lowered to the outside and then discharged out of the battery module. Further, it is possible to prevent similar burning to other batteries in the battery module. Further, since the exhaust passage can be formed by partitioning the space with the partition member, it is not necessary to provide an exhaust duct or the like, so that the space can be used efficiently and the battery module itself can be downsized. As a result, a smaller, safer and more reliable battery module can be realized.

  ADVANTAGE OF THE INVENTION According to this invention, the safe and reliable battery module which can discharge | emit high temperature jet gas to the exterior of a battery module at safe temperature, without using members, such as an exhaust duct, is realizable.

1 is a cross-sectional view of a battery according to a first embodiment of the present invention. 1 is an overall perspective view of a battery module according to a first embodiment of the present invention. 1 is an exploded perspective view of a battery module according to a first embodiment of the present invention. 3-3 partial sectional view of the battery module according to the first embodiment of the present invention. 1 is a top transparent view of a battery module according to a first embodiment of the present invention. (A) A lateral view of the partition part of the battery module according to the first embodiment of the present invention, (b) a lateral view of another partition part of the battery module according to the first embodiment of the present invention. Top surface transparent view of another battery module according to the first exemplary embodiment of the present invention. Sectional drawing of the battery module concerning Embodiment 2 of this invention. Sectional drawing of the battery module concerning Embodiment 3 of this invention. The perspective view of the partition member concerning Embodiment 3 of this invention.

  According to a first aspect of the present invention, there is provided a battery block for connecting a battery pack connecting a plurality of batteries in a two-dimensional direction, a housing having a storage portion for storing the battery block and having an open end in at least one, and an opening A substrate having a through hole corresponding to the electrode portion of the battery that covers the end, a partition member that forms a plurality of exhaust passages and has an exhaust hole at one end, and a lid that covers the partition member, and a plurality of partition members A battery module comprising one or more vent holes communicating the exhaust passages.

  With this configuration, even if a high-temperature gas is ejected from the battery due to a short circuit or the like, the gas volume can be expanded by a plurality of exhaust passages communicated by one or more vent holes. By expanding the gas in this way, the temperature of the gas can be lowered to a safe temperature and released outside the battery module by the adiabatic expansion action. Further, since the gas can be quickly lowered to a safe temperature, it is possible to prevent similar burning to other batteries, and thus a safe and highly reliable battery module can be provided.

  According to a second aspect of the present invention, there is provided a battery module according to the first aspect, further comprising an isolation structure that separates the batteries for each battery in the storage portion.

  With this configuration, it is possible to further suppress the firing of other batteries in the battery module, and thus it is possible to provide a safer and more reliable battery module.

  A third invention of the present invention is the battery module according to the second invention, wherein the battery includes a shoulder portion in contact with the substrate at the upper edge portion, and the isolation structure is formed by the shoulder portion.

  With this configuration, it is possible to further suppress the firing of other batteries in the battery module, and thus it is possible to provide a safer and more reliable battery module.

  A fourth invention of the present invention is the battery module according to the second invention, further comprising a partition member, wherein the isolation structure is formed by the partition member.

  With this configuration, it is possible to further suppress the firing of other batteries in the battery module, and thus it is possible to provide a safer and more reliable battery module.

  A fifth aspect of the present invention is the battery module according to the first aspect, wherein the partition member forms an exhaust passage corresponding to each of the one or more assembled batteries.

  With this configuration, an exhaust passage can be formed effectively, and the temperature of the high-temperature gas can be more efficiently lowered using adiabatic expansion. In addition, similar firing to other assembled batteries can be suppressed. Therefore, a safe and highly reliable battery module can be provided.

  A sixth invention of the present invention is the battery module according to the first invention, wherein the vent holes are provided at a predetermined interval.

  With this configuration, since a plurality of exhaust passages can be more effectively communicated, the gas temperature can be effectively reduced by adiabatic expansion, and a safe and highly reliable battery module can be provided.

  Hereinafter, embodiments of the present invention will be described with the same reference numerals given to the same portions with reference to the drawings. The present invention is not limited to the contents described below as long as it is based on the basic characteristics described in this specification. In the following, a non-aqueous electrolyte secondary battery such as lithium ion (hereinafter referred to as “battery”) will be described as an example of the battery, but it goes without saying that the present invention is not limited thereto.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a battery constituting the battery module according to Embodiment 1 of the present invention.

  In FIG. 1, a cylindrical battery includes, for example, a positive electrode 1 having a positive electrode lead 8 made of aluminum and a negative electrode 2 having a negative electrode lead 9 made of, for example, copper opposite to the positive electrode 1 through a separator 3. The wound electrode group 4 is provided. Then, the insulating plates 10a and 10b are mounted on the upper and lower sides of the electrode group 4 and inserted into the battery case 5, the other end of the positive electrode lead 8 is used as the sealing plate 6, and the other end of the negative electrode lead 9 is used as the battery case 5. Weld to the bottom. Further, a non-aqueous electrolyte (not shown) that conducts lithium ions is injected into the battery case 5, and the open end of the battery case 5 is connected to the positive electrode cap 16, the current blocking member 18 such as a PTC element, and the like via the gasket 7 and The sealing plate 6 is caulked. In addition, the positive electrode cap 16 is provided with a hole 17 for extracting gas generated by opening a vent mechanism 19 such as a safety valve due to a failure of the electrode group 4. And the positive electrode 1 is comprised from the positive electrode collector 1a and the positive electrode layer 1b containing a positive electrode active material.

Here, the positive electrode layer 1b includes, for example, lithium-containing composite oxide such as LiCoO ₂ , LiNiO ₂ , Li ₂ MnO ₄ , or a mixture or composite compound thereof as a positive electrode active material. The positive electrode layer 1b further includes a conductive agent and a binder. Examples of the conductive agent include natural graphite and artificial graphite graphite, acetylene black, ketjen black, channel black, furnace black, lamp black, thermal black, and other carbon blacks. Binders include, for example, PVDF, poly Including tetrafluoroethylene, polyethylene, polypropylene, aramid resin, polyamide, polyimide and the like.

  Further, as the positive electrode current collector 1a used for the positive electrode 1, aluminum (Al), carbon (C), conductive resin, or the like can be used.

As the non-aqueous electrolyte, an electrolyte solution in which a solute is dissolved in an organic solvent, or a so-called polymer electrolyte layer containing these and non-fluidized with a polymer can be applied. As the solute of the non-aqueous electrolyte, LiPF ₆ , LiBF ₄ , LiClO ₄ , LiAlCl ₄ , LiSbF ₆ , LiSCN, LiCF ₃ SO ₃ , LiN (CF ₃ CO ₂ ), LiN (CF ₃ SO ₂ ) _2, etc. should be used. Can do. Furthermore, as the organic solvent, for example, ethylene carbonate (EC), propylene carbonate, butylene carbonate, vinylene carbonate, dimethyl carbonate (DMC), diethyl carbonate, ethyl methyl carbonate (EMC) and the like can be used.

  The negative electrode current collector 11 of the negative electrode 2 is made of a metal foil such as stainless steel, nickel, copper, or titanium, or a thin film of carbon or conductive resin.

Further, the negative electrode layer 15 of the negative electrode 2 has a theoretical capacity density of 833 mAh / cm ³ for reversibly occluding and releasing lithium ions such as carbon materials such as graphite, silicon (Si), tin (Sn), and the like. More negative electrode active materials can be used.

  Next, the overall image of the battery module in the present embodiment will be described with reference to FIGS. 2 (a) and 2 (b). FIG. 2A is an overall perspective view of the battery module according to the present embodiment. FIG. 2B is an exploded perspective view of the battery module according to the present embodiment.

  The battery module 100 includes a housing portion 102 having at least one open end, a battery block 122 housed in the housing portion 102, a connection member 110, a substrate 130, a partition member 140, and a lid. 150 at least.

  The battery block 122 includes a plurality of batteries 120. That is, the battery block 122 is configured by connecting the assembled battery 121 in which the batteries 120 are connected in parallel by the connecting member 110. FIG. 1 shows a battery block 122 in which, for example, seven battery packs 121 in which ten batteries 120 are connected in parallel are further connected in series. However, the number of batteries 120 constituting the battery unit 121 and the battery block 122 is not limited to this. Moreover, the assembled battery 121 does not necessarily need to be connected in parallel, and may be connected in series. Moreover, the battery block 122 may not be what connected the assembled battery in series, and may be connected in parallel.

  The battery block 122 is housed in the housing portion 102 of the housing 101, at least one of which is an open end. The housing 101 is made of, for example, flexible urethane. A substrate 130 is provided from above the battery block 122 so as to cover the open end of the housing 101 and the battery block 122. The substrate 130 may be composed of a metal plate such as Ni or Fe—Ni plating, or may be composed of Cu, Al, a composite material thereof, or the like. The substrate 130 includes a through hole 131 corresponding to the battery 120. That is, a through hole 131 is provided in a portion located above each electrode portion 123 of the battery 120. Further, the substrate 130 includes connection terminals 132 that are connected to the electrode portions 123 of the respective batteries 120. In addition, the substrate 130 has connection wirings 133 that are connected to the connection terminals 132 and connect the plurality of batteries 120. The battery 120 is connected in parallel by the connection wiring 133 and the connection terminal 132, and the assembled battery 121 is configured.

  A partition member 140 is provided so as to cover the substrate 130 from above. The partition member 140 is preferably formed of soft urethane or the like. The partition member 140 includes a partition portion 142 so as to form a plurality of exhaust passages 141. Further, the partition member includes a vent hole (not shown) that communicates the plurality of exhaust passages 141 with each other. Further, the partition member includes an exhaust hole 143 communicating with the exhaust passage 141.

  A lid 150 is provided so as to cover the partition member 140 from above. The lid 150 is preferably formed of a metal such as copper.

  The housing 101 and the partition member 140, and the partition member 140 and the lid 150 are respectively fitted. The housing 101 includes a positive terminal 103 and a negative terminal 104.

  Next, details of the battery module of the present embodiment will be described with reference to FIGS. 3, 4, and 5 (a). FIG. 3 is a 3-3 plane partial cross-sectional view of the battery module according to the present embodiment. FIG. 4 is a top transparent view of the battery module according to the present embodiment. Specifically, it is a top transparent view of the partition member 140. Fig.5 (a) is a side view of the partition part of the battery module concerning this Embodiment. FIG.5 (b) is a side view of the other partition part of the battery module concerning this Embodiment.

  In FIG. 3, the battery module 100 stores the battery 120 constituting the assembled battery 121 in the storage portion 102 of the housing 101. A substrate 130 is provided so as to cover an open end provided on one side of the housing 101. The substrate 130 includes a through hole 131 corresponding to the battery 120. The through hole 131 is provided above the electrode part 123 of the battery 120. Further, the substrate 130 includes a connection terminal 132. In addition, the substrate 130 has connection wirings 133 that are connected to the connection terminals 132 and connect the plurality of batteries 120. The connection wiring 133 and the connection terminal 132 are connected to the electrode part 123 of the battery 120 to connect the plurality of batteries 120 in parallel to form the assembled battery 121. In addition to the configuration in which the connection wiring 133 is provided on the substrate 130 as described above, the substrate 130 itself may be configured by a conductive metal. By doing in this way, each battery 120 can be connected without providing the connection wiring 133. Above the substrate 130, a partition member 140 that forms the exhaust passage 141 is provided, and a lid 150 is provided to cover the partition member 140. The partition member 140 includes an exhaust hole 143, and the exhaust hole 143 communicates with the exhaust passage 141. The exhaust passage 141 communicates with the storage portion 102 through the through hole 131.

  In FIG. 4, the partition member of the present embodiment will be described in more detail. The partition member 140 includes a partition portion 142 corresponding to the assembled battery 121 and forms an exhaust passage 141. That is, in FIG. 4, one row of exhaust passages 141 is formed for each row of assembled batteries 121. Further, the partition portion 142 of the partition member 140 has at least one vent hole 144 that allows the exhaust passages 141 to communicate with each other. That is, in FIG. 4, one vent hole 144 is provided for every four batteries 120. The exhaust passage 141 communicates with the exhaust hole 143. The vent hole 144 is configured by forming a clearance in the partition part 142 as shown in FIG. Next, the exhaust path of the high-temperature gas ejected from the battery due to a short circuit of the battery will be described with reference to FIGS.

  The battery 120 may generate a high-temperature gas (hereinafter referred to as gas) for reasons such as a short circuit. For example, in the case of a Li-ion secondary battery, this gas is composed of carbon monoxide, ethane, ethylene, hydrogen, propane, methane, and the like. In the unlikely event, the gas may ignite when mixed with air at about 400 ° C. or higher.

  When such gas is generated from the battery 120, in FIG. 3, the gas flows from the storage portion 102 through the through hole 131 of the substrate 130 to the exhaust passage 141 formed by the partition member 140. The gas flowing into the exhaust passage 141 is discharged from the exhaust hole 143 to the outside of the battery module 100 through the exhaust passage 141. Here, as shown in FIG. 4, the exhaust passages 141 communicate with each other through the air holes 144, so that the gas that flows along the path indicated by the arrow in FIG. 4 flows into the plurality of exhaust passages 141. It flows in a distributed manner. With such a configuration, the gas volume can be expanded and the temperature of the gas can be lowered by adiabatic expansion. Thus, when the gas is discharged from the exhaust hole 143 to the outside of the battery module 100, the temperature of the gas can be lowered to a safe temperature (for example, about 400 ° C. or less). Therefore, even if mixed with air containing oxygen, a phenomenon such as ignition does not occur and the gas can be safely exhausted. Furthermore, since the temperature of the gas can be quickly reduced by utilizing adiabatic expansion, it is possible to suppress similar burning to other batteries 120.

  Further, as in the present embodiment, by forming the exhaust passage 141 for each row of the assembled batteries 121, it is possible to suppress similar firing to the assembled batteries 121 other than the assembled battery 121 including the batteries 120 from which the gas has been ejected.

  Further, by forming such an exhaust passage 141 with a simple configuration like the partition member 140, it is not necessary to provide a configuration such as an exhaust duct, and an exhaust path is provided inside the battery module. Therefore, the battery module itself can be downsized.

  In addition, as a structure of the partition member 140, in this Embodiment, it is the structure which provides the one air hole 144 for four batteries, However, It is not restricted to this. For example, FIG. 6 shows a top transparent view of a partition member of another battery module according to the present embodiment.

  The partition member 140 shown in FIG. 6 is the same as that in FIG. 4 in that one vent hole is provided for four batteries, but the vent holes 144 do not overlap each other between adjacent partition portions 142. . That is, the air holes 144 are provided alternately. Even in such a configuration, the gas ejected along the path shown by the arrow in FIG. 6 can obtain the same effect as that of the partition member 140 shown in FIG. 4 by flowing into the exhaust hole 143. is there.

  In the present embodiment, exhaust passage 141 is provided for each row of assembled batteries 121, but is not limited thereto. For example, the exhaust passage 141 may be provided for every two rows of the assembled battery 121 in accordance with the number and size of the batteries constituting the battery module, or may be different such as one row, two rows, one row,. You may provide for every row number. Furthermore, it is not necessary to correspond to the assembled battery 121, and the exhaust passage 141 may be formed in a manner orthogonal to the exhaust passage 141 provided in FIG.

  Further, a part of the partition member 140 may be formed of a metal such as copper. For example, only the portion in contact with the substrate 130 may be formed of an insulating material such as soft urethane, and the other portion may be formed of a conductive material such as copper. Thereby, the heat conduction of the partition member 140 forming the exhaust passage 141 is further increased, and the temperature of the high-temperature gas can be lowered more quickly.

  Further, the vent hole 144 is not limited to the form as shown in FIG. For example, as shown in FIG. 5B, the gap may be formed so as to spread toward the lid 150 side. In this way, by providing the vent hole 144 so as to spread toward the lid 150 side, the gas flows more efficiently in the exhaust passage 141, and adiabatic expansion is effectively performed to quickly lower the temperature of the gas. Can do. In addition to the above, a round hole may be used, and an elongated slit may be used.

  In the present embodiment, the gas is discharged from the exhaust hole 143 of the partition member 140 to the outside of the battery module. However, the present invention is not limited to this. For example, the partition member 140 may be configured to be included in a space formed by the housing 101 and the lid 150. In this case, in addition to the exhaust hole 143 described above, the housing 101 or the lid 150 is further provided with an exhaust hole, and the gas passes through the exhaust hole and the exhaust hole 143 to the outside of the battery module 100. And leaked.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. Only the points different from the first embodiment will be described below.

  FIG. 7 is a partial cross-sectional view of the battery module according to the second embodiment of the present invention. The basic configuration is the same as that of the first embodiment, except that a shoulder 124 is provided on the upper edge of the battery 120. The battery 120 is disposed such that the shoulder 124 contacts the substrate 130 in the battery module 100. In the present embodiment, the shoulder 124 serves as an isolation structure that isolates the batteries 120 individually in the storage portion 102. That is, for example, when gas is ejected due to a short circuit or the like of the battery 120, the gas first spreads in the storage portion 102, but since the battery 120 is spatially isolated by the shoulder portion 124, The gas spreads only in the space 160 formed by the shoulder 124 and the substrate 130. In other words, the gas does not spread throughout the storage portion 102 but quickly flows from the through hole 131 of the substrate 130 to the exhaust passage 141.

  With this configuration, it is possible to further suppress similar firing to other batteries due to the ejected gas. Therefore, a safer and more reliable battery module can be provided.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIGS. Similar to the second embodiment, the basic configuration of the third embodiment is the same as that of the first embodiment, and only different points will be described.

  FIG. 8 is a partial cross-sectional view of the battery module according to the third embodiment of the present invention. FIG. 9 is a perspective view of the partition member according to the present embodiment. As a difference from the first embodiment and the second embodiment, a partition member 180 is further provided as an isolation structure that isolates the inside of the storage portion 102 from each battery 120. The partition member 180 is a member as shown in FIG. As shown in FIG. 8, the upper end portion of the partition wall member 180 is in contact with the substrate 130, while the lower end portion of the partition wall member 180 is in contact with the bottom portion of the housing 101. Therefore, the partition member 180 separates the storage portion 102 for each space portion 170 for each battery 120 in the battery module 100.

  With such a configuration, for example, when gas is ejected from the battery 120 due to a short circuit or the like, it is possible to prevent the high temperature gas from spreading throughout the storage unit 102. That is, because the partition member 180 is spatially separated from the adjacent battery 120, the generated gas is quickly discharged from the space 170 in which the defective battery 120 is stored through the through hole 131. It flows to the passage 141.

  Therefore, it is possible to further prevent similar burning to another normal battery 120 that has not caused a malfunction. Thereby, a safer and more reliable battery module can be provided.

  Needless to say, the partition member 180 is not limited to the configuration shown in FIG. For example, a configuration in which the partition wall is formed integrally with the housing 101 and the substrate 130 may be employed.

  INDUSTRIAL APPLICABILITY The present invention is useful as a battery module that requires high reliability and safety for automobiles, bicycles, electric tools, and the like.

DESCRIPTION OF SYMBOLS 1 Positive electrode 1a Positive electrode collector 1b Positive electrode layer 2 Negative electrode 3 Separator 4 Electrode group 5 Battery case 6 Sealing plate 7 Gasket 8 Positive electrode lead 9 Negative electrode lead 10a, 10b Insulating plate 11 Negative electrode collector 15 Negative electrode layer 16 Positive electrode cap 17 Hole 18 Current interrupting member 19 Vent mechanism 100 Battery module 101 Housing 102 Storage portion 103 Positive electrode terminal 104 Negative electrode terminal 110 Connection member 120 Battery 121 Battery assembly 122 Battery block 123 Electrode portion 124 Shoulder portion 130 Substrate 131 Through hole 132 Connection terminal 133 Connection wiring 140 Partition member 141 Exhaust passage 142 Partition portion 143 Exhaust hole 144 Ventilation hole 150 Lid 160, 170 Space portion 180 Partition member

Claims (6)

A battery block for connecting two or more battery packs connected in a two-dimensional direction;
A housing having a housing for housing the battery block and having an open end on at least one of the housing,
A substrate that covers the open end and has a through hole corresponding to the electrode portion of the battery;
A partition member forming a plurality of exhaust passages and having an exhaust hole at one end;
A lid that covers the partition member,
The battery module according to claim 1, wherein the partition member includes one or more air holes that communicate the plurality of exhaust passages. The battery module according to claim 1, further comprising an isolation structure that separates the batteries for each of the batteries in the storage unit. The battery includes a shoulder portion in contact with the substrate at an upper edge portion,
The battery module according to claim 2, wherein the isolation structure is formed by the shoulder. Furthermore, it has a partition member,
The battery module according to claim 2, wherein the isolation structure is formed by the partition member. The battery module according to claim 1, wherein the partition member forms the exhaust passage corresponding to each of the one or more assembled batteries. The battery module according to claim 1, wherein the vent holes are provided at predetermined intervals.

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