Battery module

Abstract

To suppress short-circuit of an accommodation body and a battery cell in the occurrence of abnormal heat generation of the battery cell.SOLUTION: A battery module 100 includes a battery cell 110 and an accommodation body 200 for accommodating the battery cell 110. The accommodation body 200 includes a first metal part 212 and a first fire proof part 216 existing at least partially between the first metal part 212 and the battery cell 110.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a battery module. [Background technology]

[0002] 2. Description of the Related Art In recent years, various battery modules have been developed. A battery module includes battery cells and a housing that houses the battery cells.

[0003] Patent Document 1 describes an example of a battery module. The battery module includes a plurality of battery cells, a module frame that houses the plurality of battery cells, and an end plate that is coupled to the module frame. The end plate has a main body made of a metal material and an insulating coating that covers the entire surface of the main body.

[0004] An example of a battery module is described in Patent Document 2. The battery module includes a plurality of battery cells, a module frame that houses the plurality of battery cells, a bus bar frame located between a side portion of the module frame and the plurality of battery cells, and an insulating plate located between the side portion of the module frame and the bus bar frame. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2021-532543 [Patent Document 2] Special Publication No. 2022-519234 Summary of the Invention [Problem to be solved by the invention]

[0006] The container that houses the battery cells may have a metal part such as a metal plate. In order to prevent a short circuit between the battery cell and the metal part, an electrically insulating resin part may be provided between the battery cell and the metal part. However, if abnormal heat is generated in the battery cell, the resin part may melt. If the resin part melts, it may become difficult to prevent a short circuit between the battery cell and the metal part.

[0007] An example of an object of the present invention is to suppress a short circuit between a battery cell and a container when abnormal heat generation occurs in the battery cell. Other objects of the present invention will become apparent from the description of this specification. [Means for solving the problem]

[0008] One aspect of the present invention is as follows. 1. A battery cell; a housing that houses the battery cell; Equipped with The housing has a metal portion and a heat-resistant portion located at least partially between the metal portion and the battery cell. 2. The container further has a resin part, 2. The battery module according to claim 1, wherein the heat-resistant portion is at least partially located between the metal portion and the resin portion. 3. The battery module described in 2., wherein the metal portion and the resin portion are joined to each other with the resin portion at least partially penetrating the heat-resistant portion. 4. The battery module described in any one of 1. to 3., wherein the heat-resistant portion covers at least a portion of the edge of the metal portion. 5. The metal portion defines a notch including the at least a portion of the edge of the metal portion; 4. The battery module described in 4., wherein the space defined by the cutout and a conductor electrically connected to the battery cell at least partially overlap. 6. The battery module according to any one of 1. to 5., wherein the heat-resistant portion contains silicon fibers. 7. The battery cell has a tab; The battery module according to any one of 1. to 6., wherein the heat-resistant portion is at least partially located between the metal portion and the tab. Effect of the Invention

[0009] According to the above-described aspects of the present invention, it is possible to prevent a short circuit between the battery cell and the container when abnormal heat generation occurs in the battery cell. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is an exploded top perspective view of the battery module according to the embodiment. [Diagram 2] FIG. 2 is a front perspective view of a first plate and a second plate according to the embodiment. [Diagram 3] FIG. 3 is a schematic cross-sectional view of the line AA in FIG. 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In all the drawings, the same components are given the same reference numerals, and the description will be omitted as appropriate.

[0012] FIG. 1 is an exploded top perspective view of a battery module 100 according to an embodiment.

[0013] In each figure, the X direction, the Y direction, and the Z direction are shown for the purpose of explanation. The X direction indicates the front-rear direction of the battery module 100. The Y direction is perpendicular to the X direction. The Y direction indicates the left-right direction of the battery module 100. The Z direction is perpendicular to both the X direction and the Y direction. The Z direction indicates the up-down direction of the battery module 100. The arrows indicating the X direction, the Y direction, and the Z direction indicate the front, left, and up directions of the battery module 100, respectively. Hereinafter, as necessary, the tip side of the arrow indicating the X direction is referred to as the +X side, the opposite side of the tip of the arrow indicating the X direction is referred to as the -X side, the tip side of the arrow indicating the Y direction is referred to as the +Y side, the opposite side of the tip of the arrow indicating the Y direction is referred to as the -Y side, the tip side of the arrow indicating the Z direction is referred to as the +Z side, and the opposite side of the tip of the arrow indicating the Z direction is referred to as the -Z side. The relationship between the X direction, the Y direction, and the Z direction and the front-rear direction, left-right direction, and up-down direction of the battery module 100 is not limited to the above example.

[0014] The battery module 100 includes a plurality of battery cells 110 , a plurality of compression pads 120 , a first voltage detection device 130 , a second voltage detection device 140 , and a container 200 .

[0015] The battery cells 110 and the compression pads 120 are alternately stacked in the Y direction. Each compression pad 120 is disposed between the battery cells 110 adjacent to each other in the Y direction and on both sides of the battery cells 110 in the Y direction. Hereinafter, the battery cells 110 and the compression pads 120 alternately stacked in the Y direction are referred to as a stack of battery cells 110 as necessary. The dimension of each battery cell 110 in the X direction is the dimension in the longitudinal direction of each battery cell 110. The dimension of each battery cell 110 in the Z direction is the dimension in the lateral direction of each battery cell 110. The dimension of each battery cell 110 in the Y direction is the dimension in the thickness direction of each battery cell 110. The shape of each battery cell 110 is not limited to this example.

[0016] Each battery cell 110 includes a battery element (not shown), an exterior material 112, a positive electrode tab 114, and a negative electrode tab 116. In one example, the battery element includes a plurality of positive electrodes and a plurality of negative electrodes (not shown) alternately stacked in the Y direction, and a separator (not shown) located between the positive electrodes and the negative electrodes adjacent in the Y direction. The exterior material 112 seals the battery element and an electrolyte (not shown). The positive electrode tab 114 is electrically connected to the positive electrode of the battery element. The positive electrode tab 114 is drawn out from one of the two sides of the exterior material 112 in the X direction. The negative electrode tab 116 is electrically connected to the negative electrode of the battery element. The negative electrode tab 116 is drawn out from the other side of the exterior material 112 in the X direction. However, the structure of each battery cell 110 is not limited to this example.

[0017] Each battery cell 110 may be an all-solid-state battery. In an all-solid-state battery, a solid electrolyte layer is provided in a portion corresponding to a separator. An all-solid-state battery does not contain an electrolyte. Hereinafter, unless otherwise specified, each battery cell 110 will be described as a battery cell containing an electrolyte.

[0018] The battery cells 110 are electrically connected in series and parallel. Specifically, cell groups including at least two battery cells 110 adjacent to each other in the Y direction and connected in parallel are stacked in the Y direction and connected in series. On the +X side of the stack of battery cells 110, a positive electrode tab 114 drawn from a battery cell 110 of one cell group connected in parallel and a negative electrode tab 116 drawn from a battery cell 110 of another cell group connected in parallel are electrically connected to each other, and a tab group 118 including the positive electrode tab 114 and the negative electrode tab 116 is located. The positive electrode tab 114 and the negative electrode tab 116 in the tab group 118 are joined to each other by, for example, laser welding. The tab group 118 is also located on the -X side of the stack of battery cells 110. Thus, a plurality of cell groups are connected in series from the cell group located at one end side of the stack of battery cells 110 in the Y direction to the cell group located at the other end side of the stack of battery cells 110 in the Y direction. Hereinafter, as necessary, the tab group 118 located on the +X side of the stack of battery cells 110 will be referred to as the +X side tab group 118, and the tab group 118 located on the -X side of the stack of battery cells 110 will be referred to as the -X side tab group 118.

[0019] The electrical connection of the multiple battery cells 110 is not limited to the above example. For example, a stack of the battery cells 110 may be formed by connecting single battery cells 110 in series.

[0020] The first voltage detection device 130 detects the voltages of the multiple +X side tab group 118. The first voltage detection device 130 includes a first protector 131, multiple first voltage detection terminals 132, multiple first voltage detection lines 133, a first connector 134, and a first bus bar 135.

[0021] The first protector 131 covers the +X side portion of the stack of battery cells 110. The first protector 131 is, for example, an insulator such as resin. The first protector 131 defines a plurality of first openings 131a. Each of the plurality of +X side tab groups 118 is exposed toward the +X side through each of the plurality of first openings 131a.

[0022] Each of the multiple first voltage detection terminals 132 is located on the +X side of each of the multiple +X side tab groups 118. Each of the first voltage detection terminals 132 is, for example, a conductor such as metal. The -X side surface of each of the first voltage detection terminals 132 and the +X side surface of each of the +X side tab groups 118 are joined to each other by a joining method such as laser welding. Therefore, each of the first voltage detection terminals 132 and each of the +X side tab groups 118 are electrically connected to each other. Therefore, the first voltage detection device 130 can detect the voltage of each of the +X side tab groups 118 by each of the first voltage detection terminals 132. The multiple first voltage detection terminals 132 are held together by the first protector 131. Therefore, by placing the first protector 131 at an appropriate position with respect to the stack of the battery cells 110, each of the multiple first voltage detection terminals 132 can be placed at an appropriate position with respect to each of the multiple +X side tab groups 118.

[0023] One end of each first voltage detection line 133 and each first voltage detection terminal 132 are electrically connected to each other. The other end of each first voltage detection line 133 and the first connector 134 are electrically connected to each other. Thus, the first voltage detection terminals 132 and the first connector 134 are electrically connected to each other via the first voltage detection lines 133. Each first voltage detection line 133 is routed between one end of each first voltage detection line 133 and the other end of each first voltage detection line 133 via the first protector 131.

[0024] The first bus bar 135 is disposed at an end portion on the +Y side of the first protector 131. The first bus bar 135 is electrically connected to a positive electrode tab 114 drawn out to the +X side from a battery cell 110 of a cell group located at an end portion on the +Y side of the stack of battery cells 110. The first bus bar 135 functions as an external terminal for electrically connecting the battery module 100 to an external device such as another battery module.

[0025] The second voltage detection device 140 detects the voltages of the multiple -X side tab groups 118. The second voltage detection device 140 includes a second protector 141, multiple second voltage detection terminals 142, multiple second voltage detection lines 143, a second connector 144, and a second bus bar 145.

[0026] The second protector 141 covers the -X side portion of the stack of battery cells 110. The second protector 141 is, for example, an insulator such as resin. The second protector 141 defines a plurality of second openings 141a. Each of the plurality of -X side tab groups 118 is exposed toward the -X side through each of the plurality of second openings 141a.

[0027] Each of the second voltage detection terminals 142 is located on the -X side of each of the -X side tab groups 118. Each of the second voltage detection terminals 142 is, for example, a conductor such as metal. The +X side surface of each of the second voltage detection terminals 142 and the -X side surface of each of the -X side tab groups 118 are joined to each other by a joining method such as laser welding. Therefore, each of the second voltage detection terminals 142 and each of the -X side tab groups 118 are electrically connected to each other. Therefore, the second voltage detection device 140 can detect the voltage of each of the -X side tab groups 118 by each of the second voltage detection terminals 142. The second voltage detection terminals 142 are integrally held by the second protector 141. Therefore, by placing the second protector 141 at an appropriate position with respect to the stack of the battery cells 110, each of the second voltage detection terminals 142 can be placed at an appropriate position with respect to each of the -X side tab groups 118.

[0028] One end of each second voltage detection line 143 and each second voltage detection terminal 142 are electrically connected to each other. The other end of each second voltage detection line 143 and the second connector 144 are electrically connected to each other. Thus, the second voltage detection terminals 142 and the second connector 144 are electrically connected to each other via the second voltage detection lines 143. Each second voltage detection line 143 is routed between one end of each second voltage detection line 143 and the other end of each second voltage detection line 143 via the second protector 141.

[0029] The second bus bar 145 is disposed at an end portion on the -Y side of the second protector 141. The second bus bar 145 is electrically connected to a negative electrode tab 116 drawn out to the -X side from a battery cell 110 of a cell group located at an end portion on the -Y side of the stack of battery cells 110. The second bus bar 145 functions as an external terminal for electrically connecting the battery module 100 to an external device such as another battery module.

[0030] In the example shown in FIG. 1, the positive electrode tab 114 at the end of the multiple cell groups connected in series is drawn toward the +X side from the battery cell 110 of the cell group located at the end portion on the +Y side of the stack of battery cells 110, and the negative electrode tab 116 at the end of the multiple cell groups connected in series is drawn toward the -X side from the battery cell 110 of the cell group located at the end portion on the -Y side of the stack of battery cells 110. Thus, the first bus bar 135 is disposed on the +X side and +Y side of the stack of battery cells 110, and the second bus bar 145 is disposed on the -X side and -Y side of the stack of battery cells 110. However, the arrangement of the positive electrode tab 114 and the negative electrode tab 116 at the end of the multiple cell groups connected in series may differ depending on the number of battery cells 110 included in the stack of battery cells 110. For example, there are cases where the positive electrode tab 114 at the end of a group of multiple cells connected in series is pulled out toward the +X side from the battery cell 110 of the cell group located at the end portion on the +Y side of the stack of battery cells 110, and the negative electrode tab 116 at the end of a group of multiple cells connected in series is pulled out toward the +X side from the battery cell 110 of the cell group located at the end portion on the -Y side of the stack of battery cells 110. In this case, the first bus bar 135 is disposed on the +X side and +Y side of the stack of battery cells 110, and the second bus bar 145 is disposed on the +X side and -Y side of the stack of battery cells 110.

[0031] The container 200 includes a first plate 210 , a second plate 220 , a third plate 230 , a fourth plate 240 , a fifth plate 250 and a sixth plate 260 .

[0032] The first plate 210 covers the +X side portion of the stack of the battery cells 110 and the +X side portion of the first voltage detection device 130. The second plate 220 covers the -X side portion of the stack of the battery cells 110 and the -X side portion of the second voltage detection device 140. The third plate 230 covers the +Y side portion of the stack of the battery cells 110. The fourth plate 240 covers the -Y side portion of the stack of the battery cells 110. The fifth plate 250 covers the +Z side portion of the stack of the battery cells 110. The sixth plate 260 covers the -Z side portion of the stack of the battery cells 110. A thermally conductive adhesive 270 is disposed between the +Z side surface of the sixth plate 260 and the -Z side surface of the stack of the battery cells 110. Thus, heat generated from the stack of the battery cells 110 can be released downwards of the battery module 100 through the thermally conductive adhesive 270.

[0033] Fig. 2 is a front perspective view of a first plate 210 and a second plate 220 according to the embodiment. Fig. 3 is a schematic cross-sectional view taken along line AA in Fig. 2.

[0034] The first plate 210 according to the embodiment will be described with reference to FIGS. 2 and 3, and with reference to FIG. 1 as necessary.

[0035] The first plate 210 includes a first metal part 212, a first resin part 214, and a first fire-resistant part 216. The first metal part 212 defines a first notch 212a1 and a second notch 212a2. The first resin part 214 includes a first resin plate 214a and a plurality of first resin protrusions 214b. The first fire-resistant part 216 includes a first fire-resistant sheet 216a, a first fire-resistant extension sheet 216b1, and a second fire-resistant extension sheet 216b2.

[0036] The first metal part 212 is made of a metal such as aluminum or stainless steel. The rigidity of the first metal part 212 can be made higher than the rigidity of resin. Therefore, when the first plate 210 has the first metal part 212, the strength of the first plate 210 can be improved compared to when the first plate 210 does not have the first metal part 212 and is made only of resin.

[0037] The first metal portion 212 is a metal plate having a thickness approximately parallel to the X direction. Specifically, the first metal portion 212, excluding the first notch 212a1 and the second notch 212a2, has a substantially rectangular shape having a pair of long sides approximately parallel to the Y direction and a pair of short sides approximately parallel to the Z direction.

[0038] As shown in Fig. 2, the first notch 212a1 is located in a portion on the +Y side of the long side on the +Z side of the first metal portion 212. As shown in Figs. 1 and 2, the space defined by the first notch 212a1 and the first bus bar 135 at least partially overlap in the X direction. The first bus bar 135 is a conductor electrically connected to the battery cell 110. Therefore, electrical insulation between the first metal portion 212 and the first bus bar 135 can be ensured compared to a case in which the first metal portion 212 does not define the first notch 212a1.

[0039] As shown in Fig. 2, the second cutout 212a2 is located in a -Y side portion of the long side on the +Z side of the first metal portion 212. As shown in Figs. 1 and 2, the space defined by the second cutout 212a2 and the first connector 134 at least partially overlap in the X direction. The first connector 134 is a conductor electrically connected to the battery cell 110. Therefore, electrical insulation between the first metal portion 212 and the first connector 134 can be ensured compared to a case in which the first metal portion 212 does not define the second cutout 212a2.

[0040] The first metal portion 212 may define a notch instead of or in addition to the first notch 212a1 and the second notch 212a2. A space defined by the notch and a conductor electrically connected to the battery cell 110 may at least partially overlap in the X direction. When the space and the conductor at least partially overlap in the X direction, electrical insulation between the first metal portion 212 and the conductor can be ensured, compared to a case in which the first metal portion 212 does not define the notch.

[0041] The first resin portion 214 is made of a resin such as polypropylene (PP).

[0042] The first resin plate 214a has a thickness approximately parallel to the X direction. Specifically, the first resin plate 214a has a substantially rectangular shape having a pair of long sides approximately parallel to the Y direction and a pair of short sides approximately parallel to the Z direction.

[0043] The first resin plate 214a has electrical insulation properties. The first resin plate 214a covers substantially the entire surface of the -X side of the first metal part 212. Therefore, the first resin plate 214a is at least partially located in the X direction between the -X side surface of the first metal part 212 and the +X side surfaces of the tab group 118, the first voltage detection terminal 132, and the first bus bar 135 on the +X side. Therefore, the first resin plate 214a can suppress short circuits between the first metal part 212 and each of the tab group 118, the first voltage detection terminal 132, and the first bus bar 135 on the +X side.

[0044] The first resin protrusions 214b are provided on the surface side of the first resin plate 214a on the +X side. For example, the first resin plate 214a and the first resin protrusions 214b are integrally formed by resin molding. The first metal part 212 and the first resin plate 214a are joined to each other by heat caulking the first resin protrusions 214b in a state in which a first fireproof sheet 216a described later is at least partially disposed between the -X side surface of the first metal part 212 and the +X side surface of the first resin plate 214a. Specifically, in a state in which the first metal part 212 and the first resin plate 214a are joined to each other, each of the first resin protrusions 214b penetrates a through hole provided in the first fireproof sheet 216a and a through hole provided in the first metal part 212 in the X direction. The dimension of the end portion on the +X side of each first resin protrusion 214b in the direction perpendicular to the X direction is larger than the dimension of the through hole provided in the first metal part 212 in the direction perpendicular to the X direction by heat crimping the end portion on the +X side of each first resin protrusion 214b. Therefore, the first metal part 212 and the first resin plate 214a are joined to each other in a state in which the first metal part 212 does not come off the first resin plate 214a toward the +X side. However, the method of joining the first metal part 212 and the first resin plate 214a is not limited to heat crimping the end portion on the +X side of each first resin part 214.

[0045] The moldability of the first resin portion 214 is higher than the moldability of the first fire-resistant portion 216. Therefore, in the embodiment, the degree of freedom of the shape of the -X side of the first plate 210 can be improved compared to a case in which the first plate 210 does not include the first resin portion 214. However, the first plate 210 may include the first metal portion 212 and the first fire-resistant portion 216 without including the first resin portion 214.

[0046] The first refractory portion 216 includes a refractory material such as, for example, silicone fiber.

[0047] The first fire-resistant sheet 216a has a thickness approximately parallel to the X-direction. Specifically, the first resin plate 214a, except for the first fire-resistant extending sheet 216b1 and the second fire-resistant extending sheet 216b2, has a substantially rectangular shape having a pair of long sides approximately parallel to the Y-direction and a pair of short sides approximately parallel to the Z-direction.

[0048] The first fireproof sheet 216a has electrical insulation. The first fireproof sheet 216a covers substantially the entire surface of the -X side of the first metal part 212. Therefore, the first fireproof sheet 216a is at least partially located between the -X side surface of the first metal part 212 and the +X side surfaces of the tab group 118, the first voltage detection terminal 132, and the first bus bar 135 on the +X side in the X direction. Therefore, the first fireproof sheet 216a can suppress short circuits between the first metal part 212 and each of the tab group 118, the first voltage detection terminal 132, and the first bus bar 135 on the +X side.

[0049] The first fireproof sheet 216a does not have to cover substantially the entire surface of the -X side of the first metal part 212. For example, the first fireproof sheet 216a may partially cover portions of the -X side surface of the first metal part 212 that overlap in the X direction with the +X side tab group 118, the first voltage detection terminal 132, and the first bus bar 135. When the first fireproof sheet 216a partially covers the portions of the -X side surface of the first metal part 212, the first fireproof sheet 216a can suppress short circuits between the first metal part 212 and the +X side tab group 118, the first voltage detection terminal 132, and the first bus bar 135. When the first fire-resistant sheet 216a partially covers the -X side surface of the first metal part 212, the material cost of the first fire-resistant sheet 216a can be reduced compared to when the first fire-resistant sheet 216a covers almost the entire -X side surface of the first metal part 212.

[0050] As shown in FIG. 2, the first fire-resistant extension sheet 216b1 is folded back toward the -Z side with at least a portion of the first fire-resistant extension sheet 216b1 covering at least a portion of the edge of the first notch 212a1 of the first metal portion 212. In the example shown in FIG. 2, the first fire-resistant extension sheet 216b1 covers the edge of the first notch 212a1 of the first metal portion 212 facing the +Z side. Therefore, compared to a case in which the first fire-resistant extension sheet 216b1 does not cover the edge of the first metal portion 212, electrical insulation between the first metal portion 212 and the conductor disposed around the first notch 212a1 can be ensured. For example, a connection bus bar (not shown) that electrically connects the first bus bar 135 and a bus bar of an external device such as another battery module to each other may be disposed around the first notch 212a1. In the embodiment, even if the connection bus bar falls toward the edge of the first metal portion 212, a short circuit between the connection bus bar and the first metal portion 212 can be suppressed by the first fire-resistant extending sheet 216b1.

[0051] As shown in FIG. 2, the second fire-resistant extension sheet 216b2 is folded back toward the -Z side with at least a portion of the second fire-resistant extension sheet 216b2 covering at least a portion of the edge of the second notch 212a2 of the first metal part 212. In the example shown in FIG. 2, the second fire-resistant extension sheet 216b2 covers the edge of the second notch 212a2 of the first metal part 212 facing the +Z side. Therefore, compared to a case in which the second fire-resistant extension sheet 216b2 does not cover the edge of the first metal part 212, it is possible to ensure electrical insulation between the first metal part 212 and the conductor arranged around the second notch 212a2. For example, a harness (not shown) electrically connected to the first connector 134 may be arranged around the second notch 212a2. In the embodiment, even if the harness falls toward the edge of the first metal portion 212, a short circuit between the harness and the first metal portion 212 can be suppressed by the second fire-resistant extending sheet 216b2.

[0052] In the embodiment, the first refractory portion 216 covers at least a part of the edge of the notch of the first metal portion 212, such as the first notch 212a1 and the second notch 212a2. However, the first refractory portion 216 may cover at least a part of an edge different from the edge of the notch of the first metal portion 212. For example, the first refractory portion 216 may cover at least a part of the edge of the first metal portion 212 in a state in which the first metal portion 212 does not define a notch. When the first refractory portion 216 covers at least a part of the edge of the first metal portion 212, electrical insulation between the first metal portion 212 and a conductor disposed around the part of the edge of the first metal portion 212 covered by the first refractory portion 216 can be ensured, compared to a case in which the first refractory portion 216 does not cover any part of the edge of the first metal portion 212.

[0053] The first fire-resistant portion 216 is a heat-resistant portion having a relatively high heat resistance. As the heat resistance of the first fire-resistant portion 216, the electrical insulation of the first fire-resistant portion 216 is maintained, for example, after the first fire-resistant portion 216 is exposed to 800° C. for 10 minutes, preferably after the first fire-resistant portion 216 is exposed to 1000° C. for 10 minutes. In the embodiment, even if abnormal heat generation occurs in the battery cell 110, the heat resistance of the first fire-resistant portion 216 can make the first fire-resistant portion 216 difficult to melt. Therefore, even if the first resin portion 214 melts due to abnormal heat generation in the battery cell 110, the first fire-resistant portion 216 can make it difficult to melt. Therefore, even if the first resin portion 214 melts due to abnormal heat generation in the battery cell 110, the first fire-resistant portion 216 can suppress short-circuiting between the first metal portion 212 and each of the tab group 118 on the +X side, the first voltage detection terminal 132, and the first bus bar 135.

[0054] In one example, the heat resistance of the first fire-resistant portion 216 is higher than the heat resistance of the first resin portion 214. When the heat resistance of the first fire-resistant portion 216 is higher than the heat resistance of the first resin portion 214, the first fire-resistant portion 216 can be made less likely to melt than the first resin portion 214 even if abnormal heat generation occurs in the battery cell 110.

[0055] The first fire-resistant portion 216 further has a relatively high fire resistance. The fire resistance is determined by the time required for a flame to burn a certain member. The longer the time required for the flame to burn a member, the higher the fire resistance, and the shorter the time required for the flame to burn a member, the lower the fire resistance. In the embodiment, even if abnormal heat is generated in the battery cell 110, the fire resistance of the first fire-resistant portion 216 can make the first fire-resistant portion 216 difficult to melt. Therefore, even if the first resin portion 214 melts due to abnormal heat generation in the battery cell 110, the first fire-resistant portion 216 can make it difficult to melt. Therefore, even if the first resin portion 214 melts due to abnormal heat generation in the battery cell 110, the first fire-resistant portion 216 can suppress short-circuiting between the first metal portion 212 and each of the tab group 118 on the +X side, the first voltage detection terminal 132, and the first bus bar 135.

[0056] In one example, the fire resistance of the first fire-resistant portion 216 is higher than the fire resistance of the first resin portion 214. When the fire resistance of the first fire-resistant portion 216 is higher than the fire resistance of the first resin portion 214, the first fire-resistant portion 216 can be made less likely to melt than the first resin portion 214 even if abnormal heat generation occurs in the battery cell 110.

[0057] The first fire-resistant portion 216 may or may not have flame resistance. If the first fire-resistant portion 216 has flame resistance, the first fire-resistant portion 216 may melt without burning at a temperature higher than the heat resistance temperature of the first fire-resistant portion 216. If the first fire-resistant portion 216 does not have flame resistance, the first fire-resistant portion 216 may burn and melt at a temperature higher than the heat resistance temperature of the first fire-resistant portion 216.

[0058] 2, the second plate 220, like the first plate 210, includes a second metal portion 222 and a second resin portion 224 corresponding to the first metal portion 212 and the first resin portion 214, respectively. The second plate 220, like the first plate 210, includes a second fire-resistant portion (not shown) corresponding to the first fire-resistant portion 216. Therefore, even if abnormal heat generation occurs in the battery cell 110, it is possible to suppress short-circuiting between the second metal portion 222 and each of the -X side tab group 118, the second voltage detection terminal 142, and the second bus bar 145 by the second fire-resistant portion.

[0059] In the embodiment, the first plate 210 and the second plate 220 have been described as having a three-layer structure of a resin part, a fireproof part, and a metal part. However, the third plate 230, the fourth plate 240, the fifth plate 250, and the sixth plate 260 may also have a three-layer structure of a resin part, a fireproof part, and a metal part, similar to the first plate 210 and the second plate 220. When the fireproof part of each plate is at least partially located between the metal part of each plate and the battery cell 110, it is possible to suppress a short circuit between the battery cell 110 and the container 200 when abnormal heat generation occurs in the battery cell 110, compared to when the fireproof part is not provided in each plate. In addition, each plate may have a three-layer structure of a resin part, a heat-resistant part, and a metal part. The heat-resistant part may or may not have fire resistance.

[0060] Although the embodiments of the present invention have been described above with reference to the drawings, these are merely examples of the present invention, and various configurations other than those described above can also be adopted. [Explanation of symbols]

[0061] 100 battery module, 110 battery cell, 112 exterior material, 114 positive electrode tab, 116 negative electrode tab, 118 tab group, 120 compression pad, 130 first voltage detection device, 131 first protector, 131a first opening, 132 first voltage detection terminal, 133 first voltage detection line, 134 first connector, 135 first bus bar, 140 second voltage detection device, 141 second protector, 141a second opening, 142 second voltage detection terminal, 143 second voltage detection line, 144 second connector, 145 second bus bar, 200 container, 210 first plate, 212 first metal portion, 212a1 first notch, 212a2 second notch, 214 first resin portion, 214a first resin plate, 214b first resin protrusion, 216 First fireproof part, 216a First fireproof sheet, 216b1 First fireproof extension sheet, 216b2 Second fireproof extension sheet, 220 Second plate, 222 Second metal part, 224 Second resin part, 230 Third plate, 240 Fourth plate, 250 Fifth plate, 260 Sixth plate, 270 Thermally conductive adhesive

Claims

1. A battery cell; a housing that houses the battery cell; Equipped with The housing has a metal portion and a heat-resistant portion located at least partially between the metal portion and the battery cell.

2. The container further includes a resin portion. The battery module according to claim 1 , wherein the heat-resistant portion is at least partially located between the metal portion and the resin portion.

3. The battery module according to claim 2 , wherein the metal portion and the resin portion are joined to each other in a state in which the resin portion at least partially penetrates the heat-resistant portion.

4. The battery module according to any one of claims 1 to 3, wherein the heat-resistant portion covers at least a portion of an edge of the metal portion.

5. the metal portion defines a notch including the at least a portion of the edge of the metal portion; The battery module according to claim 4 , wherein the spaces defined by the cutouts and conductors electrically connected to the battery cells at least partially overlap each other.

6. The battery module according to claim 1 , wherein the heat-resistant portion includes silicon fiber.

7. The battery cell has a tab. The battery module according to any one of claims 1 to 3, wherein the heat-resistant portion is at least partially located between the metal portion and the tab.

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