Battery module and battery pack

Abstract

To make it easy to install a heat resistance body.SOLUTION: A battery module 100 includes a battery cell 110, a module housing 150 including a gas discharge hole 150a for discharging gas emitted from the battery cell 110, and a heat resistance sheet 160 that at least partially overlaps with the gas discharge hole 150a. The heat resistance sheet 160 is disposed movably in the module housing 150.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] In recent years, various battery packs have been developed. A battery pack includes a battery module and a pack housing that houses the battery module. A battery module includes battery cells and a module housing that houses the battery cells.

[0003] Patent Document 1 describes a battery pack. The battery pack includes two battery stacks and a case that houses the two battery stacks. The battery stacks include battery cells with exhaust valves. The case includes an upper case that is provided with a plate that overlaps with a gas exhaust section.

[0004] Patent Document 2 describes a battery device. The battery device includes a battery and a housing that houses the battery. A heat insulating member is attached to the back surface of the upper wall of the housing. The heat insulating member faces the upper surface of the battery. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-197622 [Patent Document 2] Japanese Patent Publication No. 2020-053223 Summary of the Invention [Problem to be solved by the invention]

[0006] The heat resistant body may at least partially overlap with a gas exhaust portion that exhausts gases emitted from the battery cell. When the heat resistant body at least partially overlaps with the gas exhaust portion, it may be required to facilitate installation of the heat resistant body.

[0007] One object of the present invention is to facilitate the installation of a refractory body. 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 structure having a gas exhaust section that exhausts gas emitted from the battery cell; a heat-resistant body at least partially overlapping the gas exhaust portion; Equipped with The heat-resistant body is movably disposed on the structure. 2. The battery module according to claim 1, wherein the heat-resistant body and the structure are partially attached to each other. 3. The battery module according to 1. or 2., wherein the heat-resistant body is flexible. 4. A battery module according to any one of 1. to 3.; a housing that houses the battery module; A battery pack comprising: [Effects of the Invention]

[0009] According to the above aspect of the present invention, the heat-resistant body can be easily installed. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a battery pack according to an embodiment. [Figure 2] FIG. 2 is a plan view of the battery pack according to the embodiment with the upper case removed. [Figure 3] 3 is a cross-sectional view taken along the line AA in FIG. 2. [Figure 4] FIG. 2 is an exploded perspective view of an example of a battery module according to the embodiment. [Figure 5] FIG. 10 is a perspective view of the battery module according to the embodiment in a state in which gas is discharged from the gas discharge hole. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, similar components are designated by similar reference numerals, and the description thereof will be omitted as appropriate.

[0012] Fig. 1 is a perspective view of a battery pack 10 according to an embodiment. Fig. 2 is a plan view of the battery pack 10 according to an embodiment with an upper case 220 removed. Fig. 3 is a cross-sectional view taken along line AA in Fig. 2. Fig. 4 is an exploded perspective view of an example of a battery module 100 according to an embodiment.

[0013] In the embodiment, the battery pack 10 is mounted on an automobile. Specifically, the battery pack 10 is mounted between the front and rear wheels of the automobile. Unless otherwise specified, the following description will be given assuming that the battery pack 10 is mounted on an automobile. However, the battery pack 10 can also be used for purposes other than automobiles.

[0014] For the purpose of explanation, the X, Y, and Z directions are shown in each figure. The X direction indicates the front-to-rear direction of the battery pack 10. The Y direction is perpendicular to the X direction. The Y direction indicates the left-to-right direction of the battery pack 10. The Z direction is perpendicular to both the X and Y directions. The Z direction indicates the up-to-down direction of the battery pack 10. The arrows pointing to the X direction, the Y direction, and the Z direction indicate the front, left, and up directions of the battery pack 10, respectively. In Figures 2 and 3, a white circle with a black dot indicating the Y direction or the Z direction indicates that the arrow pointing in the direction indicated by the white circle extends from the back to the front of the page. However, the relationship between the X direction, Y direction, and Z direction and the front-to-rear direction, left-to-right direction, and up-to-down direction of the battery pack 10 is not limited to this example.

[0015] In the embodiment, the front-rear direction, left-right direction, and up-down direction of the battery pack 10 are determined by the vehicle in which the battery pack 10 is mounted. The X direction, Y direction, and Z direction respectively indicate the front-rear direction, left-right direction, and up-down direction of the vehicle. The arrow pointing to the X direction, the arrow pointing to the Y direction, and the arrow pointing to the Z direction respectively indicate the front, left, and up directions of the vehicle. However, the relationship between the front-rear direction, left-right direction, and up-down direction of the battery pack 10 and the front-rear direction, left-right, and up-down directions of the vehicle is not limited to this example.

[0016] Hereinafter, as needed, the side indicated by the arrow indicating the X direction will be referred to as the +X side, and the side opposite the side indicated by the arrow indicating the X direction will be referred to as the -X side. Hereinafter, as needed, the side indicated by the arrow indicating the Y direction will be referred to as the +Y side, and the side opposite the side indicated by the arrow indicating the Y direction will be referred to as the -Y side. Hereinafter, as needed, the side indicated by the arrow indicating the Z direction will be referred to as the +Z side, and the side opposite the side indicated by the arrow indicating the Z direction will be referred to as the -Z side.

[0017] The battery pack 10 will be described with reference to FIGS.

[0018] As shown in FIGS. 1 to 3, the battery pack 10 includes four battery modules 100 and a pack housing 200. The pack housing 200 has a lower case 210 and an upper case 220. The lower case 210 includes a lower plate 212, side frames 214, and a support frame 216. The lower case 210 may also be generally referred to as, for example, a tray or a main body. The upper case 220 may also be generally referred to as, for example, a cover or a lid.

[0019] 2, when viewed from the Z direction, the four battery modules 100 are arranged in two rows and two columns in each of the X and Y directions. The number and arrangement of the battery modules 100 are not limited to the example shown in FIG.

[0020] As shown in Fig. 3, the lower plate 212 is disposed approximately perpendicular to the Z direction. The side frames 214 are approximately perpendicular to the lower plate 212. As shown in Fig. 2, when viewed from the Z direction, the side frames 214 extend along the outer peripheral edge of the lower plate 212 in the X direction. As shown in Fig. 2, when viewed from the Z direction, the support frame 216 is approximately a frame body that surrounds each of the four battery modules 100.

[0021] 3 , the upper case 220 is located on the +Z side of the lower case 210 and covers the multiple battery modules 100. The lower case 210 and the upper case 220 are attached to each other with a sealant 230 such as rubber positioned between the +Z side surface of the side frame 214 and the portion of the lower case 210 that overlaps with the +Z side surface of the side frame 214 in the Z direction. The lower case 210 and the upper case 220 define an accommodating space 250 that accommodates the multiple battery modules 100. The accommodating space 250 is sealed from the outside of the pack casing 200 when the lower case 210 and the upper case 220 are attached to each other via the sealant 230.

[0022] 1 and 2, a pair of terminals 218 is provided in front of the side frame 214. The pair of terminals 218 is aligned in the Y direction. The +X side end of each terminal 218 protrudes toward the +X side from the +X side surface of the side frame 214. In the electrical path, the four battery modules 100 are connected in series between the pair of terminals 218.

[0023] Each battery module 100 will be described with reference to Fig. 4. Note that each battery module 100 may be arranged in the battery pack 10 in a state where the X direction, Y direction, and Z direction shown in Fig. 4 do not coincide with the X direction, Y direction, and Z direction shown in Figs. 1 to 3. For example, each battery pack 10 may be arranged in the battery pack 10 in a state where the X direction shown in Fig. 4 and the Y direction shown in Figs. 1 to 3 are the same direction, and the Y direction shown in Fig. 4 and the X direction shown in Figs. 1 to 3 are the same direction.

[0024] As shown in FIG. 4, each 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, a module housing 150, and a heat-resistant sheet 160.

[0025] The multiple battery cells 110 and the multiple compression pads 120 are stacked alternately in the Y direction. Hereinafter, as necessary, the multiple battery cells 110 and the multiple compression pads 120 stacked alternately in the Y direction will be referred to as a stack of battery cells 110. The longitudinal direction of each battery cell 110 is approximately parallel to the X direction. The lateral direction of each battery cell 110 is approximately parallel to the Z direction. The thickness direction of each battery cell 110 is approximately parallel to the Y direction. The shape of each battery cell 110 is not limited to this example.

[0026] 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) stacked alternately in the Y direction, and a separator (not shown) positioned between adjacent positive electrodes and negative electrodes 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 both 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.

[0027] Each battery cell 110 may be an all-solid-state battery. In an all-solid-state battery, a solid electrolyte layer is provided in the portion corresponding to the separator. An all-solid-state battery does not contain an electrolyte solution. Hereinafter, unless otherwise specified, each battery cell 110 will be described as a battery cell containing an electrolyte solution.

[0028] The multiple battery cells 110 are electrically connected in a combination of 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 tab group 118 including 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 is electrically connected to each other, and the positive electrode tab 114 and the negative electrode tab 116 are arranged. 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. A tab group 118 is also arranged in a similar manner on the -X side of the stack of battery cells 110. Thus, multiple cell groups are connected in series from the cell group located at one end of the stack of battery cells 110 in the Y direction to the cell group located at the other end 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.

[0029] The electrical connection of the multiple battery cells 110 is not limited to the above example. For example, single battery cells 110 may be connected in series to form a stack of battery cells 110. Alternatively, each cell group may include three or more battery cells 110 connected in parallel.

[0030] The first voltage detection device 130 detects the voltages of the multiple +X side tab groups 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.

[0031] The first protector 131 covers the +X side portion of the stack of battery cells 110. The first protector 131 is made of an insulating material 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.

[0032] 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 first voltage detection terminal 132 is made of a conductor such as metal. The -X side surface of each first voltage detection terminal 132 and the +X side surface of each +X side tab group 118 are joined to each other by a joining method such as laser welding. Therefore, each first voltage detection terminal 132 and each +X side tab group 118 are electrically connected to each other. Therefore, the first voltage detection device 130 can detect the voltage of each +X side tab group 118 using each first voltage detection terminal 132. The multiple first voltage detection terminals 132 are held together by a first protector 131. Therefore, by installing the first protector 131 at an appropriate position relative to the stack of battery cells 110, each of the multiple first voltage detection terminals 132 can be positioned appropriately relative to each of the multiple +X side tab groups 118.

[0033] One end of each first voltage detection line 133 is electrically connected to each first voltage detection terminal 132. The other end of each first voltage detection line 133 is electrically connected to each first connector 134. Therefore, the multiple first voltage detection terminals 132 and the first connector 134 are electrically connected to each other via the multiple first voltage detection lines 133. Each first voltage detection line 133 is routed between one end of the first voltage detection line 133 and the other end of the first voltage detection line 133 via the first protector 131.

[0034] The first bus bar 135 is disposed at the end of the first protector 131 on the +Y side. The first bus bar 135 is electrically connected to the positive electrode tab 114 drawn out to the +X side from the battery cell 110 of the cell group located at the end of 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.

[0035] The second voltage detecting device 140 detects the voltages of the plurality of -X side tab groups 118. The second voltage detecting device 140 includes a second protector 141, a plurality of second voltage detecting terminals 142, a plurality of second voltage detecting lines 143, a second connector 144, and a second bus bar 145.

[0036] The second protector 141 covers the -X side portion of the stack of battery cells 110. The second protector 141 is made of an insulating material 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.

[0037] Each of the multiple second voltage detection terminals 142 is located on the -X side of each of the multiple -X side tab groups 118. Each second voltage detection terminal 142 is made of a conductor such as metal. The +X side surface of each second voltage detection terminal 142 and the -X side surface of each -X side tab group 118 are joined to each other by a joining method such as laser welding. Therefore, each second voltage detection terminal 142 and each -X side tab group 118 are electrically connected to each other. Therefore, the second voltage detection device 140 can detect the voltage of each -X side tab group 118 using each second voltage detection terminal 142. The multiple second voltage detection terminals 142 are held together by a second protector 141. Therefore, by installing the second protector 141 at an appropriate position relative to the stack of battery cells 110, each of the multiple second voltage detection terminals 142 can be positioned appropriately relative to each of the multiple -X side tab groups 118.

[0038] One end of each second voltage detection line 143 is electrically connected to each second voltage detection terminal 142. The other end of each second voltage detection line 143 is electrically connected to each second connector 144. Therefore, 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 the second voltage detection line 143 and the other end of the second voltage detection line 143 via the second protector 141.

[0039] The second bus bar 145 is disposed at the -Y side end of the second protector 141. The second bus bar 145 is electrically connected to the negative electrode tab 116 drawn out to the -X side from the battery cell 110 of the cell group located at the -Y side end 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.

[0040] 4, the positive electrode tab 114 at the end of each of the plurality of serially connected cell groups is drawn out toward the +X side from the battery cell 110 of the cell group located at the +Y side end of the stack of battery cells 110, and the negative electrode tab 116 at the end of each of the plurality of serially connected cell groups is drawn out toward the -X side from the battery cell 110 of the cell group located at the -Y side end of the stack of battery cells 110. Thus, the first bus bar 135 is disposed on the +X side and the +Y side of the stack of battery cells 110, and the second bus bar 145 is disposed on the -X side and the -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 each of the plurality of serially connected cell groups may differ depending on the number of battery cells 110 included in the stack of battery cells 110. For example, consider a case 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 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 on the -Y side of the stack of battery cells 110. In this case, the bus bar electrically connected to the positive electrode tab 114 at the end of the group of multiple cells connected in series is arranged on both the +X side and the +Y side of the stack of battery cells 110, and the bus bar electrically connected to the negative electrode tab 116 at the end of the group of multiple cells connected in series is arranged on the +X side and the -Y side of the stack of battery cells 110.

[0041] The module housing 150 includes a first plate 151, a second plate 152, a third plate 153, a fourth plate 154, a fifth plate 155, and a sixth plate 156. Each plate is made of a metal such as aluminum.

[0042] The first plate 151 covers the +X side portion of the stack of battery cells 110, with the first voltage detection device 130 located between the stack of battery cells 110 and the first plate 151. The second plate 152 covers the -X side portion of the stack of battery cells 110, with the second voltage detection device 140 located between the stack of battery cells 110 and the second plate 152. The third plate 153 covers the +Y side portion of the stack of battery cells 110. The fourth plate 154 covers the -Y side portion of the stack of battery cells 110. The fifth plate 155 covers the +Z side portion of the stack of battery cells 110, with multiple structural adhesives 157a located between the stack of battery cells 110 and the fifth plate 155. In the example shown in FIG. 4, the multiple structural adhesives 157a extend in the Y direction. The layout of the structural adhesives 157a is not limited to the example shown in FIG. 4. The stack of battery cells 110 and the fifth plate 155 are bonded to each other via a plurality of structural adhesives 157a. The sixth plate 156 covers the -Z side portion of the stack of battery cells 110, with a thermally conductive adhesive 157b positioned between the stack of battery cells 110 and the sixth plate 156. The stack of battery cells 110 and the sixth plate 156 are bonded to each other via the thermally conductive adhesive 157b. The stack of battery cells 110 and the sixth plate 156 are thermally coupled to each other via the thermally conductive adhesive 157b. The thermal conductivity of the thermally conductive adhesive 157b is higher than that of the structural adhesive 157a. Therefore, heat generated from the stack of battery cells 110 is more easily conducted toward the thermally conductive adhesive 157b than toward the structural adhesive 157a.

[0043] As shown in FIG. 4, the fifth plate 155 includes a plate main body 155a and multiple lead-out portions 155b. The plate main body 155a is disposed substantially perpendicular to the Z direction. When viewed from the Z direction, the plate main body 155a has a substantially square or rectangular shape with a pair of sides parallel to the X direction and another pair of sides parallel to the Y direction. The multiple lead-out portions 155b are led out from both sides of the plate main body 155a in the X direction. In the example shown in FIG. 4, when viewed from the Y direction, the lead-out portion 155b on the +X side has a substantially L-shape including a portion bent toward the -Z side from the +X side side of the plate main body 155a and another portion bent toward the +X side from the -Z side end of the portion. In the example shown in Figure 4, when viewed from the Y direction, the -X side pull-out portion 155b has a roughly L-shape that includes a part that is bent toward the -Z side from the -X side edge of the plate main body portion 155a, and another part that is bent toward the -X side from the -Z side end of the part.

[0044] As shown in Fig. 4, the plate main body 155a is provided with a plurality of gas exhaust holes 150a. Therefore, relatively high-temperature gas discharged from the battery cells 110 due to factors such as an abnormality in the battery cells 110 can be discharged through the gas exhaust holes 150a. Therefore, the module housing 150 has a structure having the gas exhaust holes 150a that function as gas exhaust sections that discharge gas discharged from the battery cells 110. In the example shown in Fig. 4, the plurality of gas exhaust holes 150a are arranged in a plurality of rows and a plurality of columns in the X direction and the Y direction. The number and arrangement of the plurality of gas exhaust holes 150a are not limited to the example shown in Fig. 4.

[0045] As shown in FIG. 4, the heat-resistant sheet 160 is disposed on the +Z side of the +Z side surface of the plate main body 155a. When viewed from the Z direction, the heat-resistant sheet 160 and the plate main body 155a have substantially the same shape. Therefore, the heat-resistant sheet 160 overlaps substantially the entire +Z side surface of the plate main body 155a. Therefore, the heat-resistant sheet 160 and the multiple gas discharge holes 150a at least partially overlap in the Z direction. When viewed from the Z direction, the heat-resistant sheet 160 and the plate main body 155a may have different shapes from each other, as long as the heat-resistant sheet 160 and the multiple gas discharge holes 150a at least partially overlap in the Z direction.

[0046] In the embodiment, the heat-resistant sheet 160 is movably disposed on the fifth plate 155. Specifically, the -Z side surface of the heat-resistant sheet 160 and the +Z side surface of the fifth plate 155 are not bonded to each other. Therefore, the heat-resistant sheet 160 and the fifth plate 155 are separable from each other. Therefore, when an external force is applied to move the heat-resistant sheet 160 toward the +Z side, the heat-resistant sheet 160 is at least partially movable in the Z direction relative to the fifth plate 155.

[0047] As shown in FIG. 4 , the heat-resistant sheet 160 and the fifth plate 155 are partially attached by a plurality of locking portions 162. Thus, the heat-resistant sheet 160 is movably fixed to the fifth plate 155. The plurality of locking portions 162 are drawn out from both sides of the heat-resistant sheet 160 in the X direction. The locking portion 162 on the +X side and the drawn-out portion 155b on the +X side are attached to each other by joining, for example, adhesive, screwing, welding, etc. The locking portion 162 on the −X side and the drawn-out portion 155b on the −X side are attached to each other by joining, for example, adhesive, screwing, welding, etc. Therefore, even if an external force is applied to move the heat-resistant sheet 160 toward the +Z side, the heat-resistant sheet 160 can be prevented from being detached from the drawn-out portion 155b. 4, three locking portions 162 are drawn out from approximately the center in the Y direction of the +X side edge of the heat-resistant sheet 160 and from both ends in the Y direction of the +X side edge of the heat-resistant sheet 160. The same can be done for the locking portions 162 drawn out from the -X side edge of the heat-resistant sheet 160. However, the number and arrangement of the locking portions 162 are not limited to the example shown in FIG.

[0048] FIG. 5 is a perspective view of the battery module 100 of the embodiment in a state where gas has been discharged from the gas discharge holes 150a.

[0049] In the example shown in FIG. 5, relatively high-temperature gas discharged from the battery cell 110 due to factors such as an abnormality in the battery cell 110 is discharged through the multiple gas discharge holes 150a. Therefore, an external force is applied to the portions of the heat-resistant sheet 160 that overlap with the multiple gas discharge holes 150a in the Z direction to move the heat-resistant sheet 160 toward the +Z side. In the example shown in FIG. 5, the heat-resistant sheet 160 is flexible. Both sides of the heat-resistant sheet 160 in the X direction are fixed to the draw-out portion 155b by locking portions 162. Therefore, as shown in FIG. 5, when gas is discharged through the multiple gas discharge holes 150a, the heat-resistant sheet 160 at least partially rises toward the +Z side when viewed from the Y direction, with the approximate center of the heat-resistant sheet 160 in the X direction curved convexly toward the +Z side.

[0050] As shown in FIG. 5 , when the heat-resistant sheet 160 is at least partially raised, the space between the plate main body 155a and the heat-resistant sheet 160 is open at both ends in the Y direction of the space between the plate main body 155a and the heat-resistant sheet 160. Therefore, gas discharged from the gas discharge holes 150a can flow toward both sides in the Y direction of the space between the plate main body 155a and the heat-resistant sheet 160. This prevents the gas discharged from the gas discharge holes 150a from being sprayed toward the +Z side of the heat-resistant sheet 160. This protects the portion of the upper case 220 located on the +Z side of the battery module 100 from the gas. In other words, the heat-resistant sheet 160 serves as a heat-resistant body that protects components, such as the upper case 220, located on the +Z side of the battery module 100 from the gas discharged from the gas discharge holes 150a.

[0051] The material of the heat-resistant sheet 160 is not particularly limited as long as it can protect components such as the upper case 220 located on the +Z side of the battery module 100 from the gas discharged through the gas discharge holes 150a. The heat-resistant sheet 160 is, for example, a fiber sheet made of silicone fibers. Alternatively, the heat-resistant sheet 160 can be, but is not limited to, a fiber sheet made of fibers containing carbon, silica, alumina, magnesia, or the like, together with a silicone resin or a fluorine-based resin, or a ceramic plate. From the viewpoints of formability and heat resistance, the above-mentioned fiber sheets having a fiber heat resistance temperature of 1000°C or higher are particularly preferred.

[0052] In the embodiment, the direction of gas flowing from the space between the plate main body 155a and the heat-resistant sheet 160 can be adjusted by the attachment positions of the fifth plate 155 and the locking portion 162. For example, if the fifth plate 155 and the locking portion 162 are attached to both sides of the heat-resistant sheet 160 in the Y direction instead of both sides in the X direction, gas discharged from the plurality of gas discharge holes 150a can flow toward both sides in the X direction with respect to the space between the plate main body 155a and the heat-resistant sheet 160. Alternatively, if the fifth plate 155 and the locking portion 162 are not attached to both sides of the heat-resistant sheet 160 in the +Y direction but are attached to both sides of the heat-resistant sheet 160 in the X direction and the -Y side, gas discharged from the plurality of gas discharge holes 150a can flow toward the +Y side with respect to the space between the plate main body 155a and the heat-resistant sheet 160.

[0053] In the embodiment, the heat-resistant sheet 160 is attached to the battery module 100. Therefore, compared to when the heat-resistant sheet 160 is attached to the −Z side surface of the upper case 220 on the +Z side of the battery module 100, it is easier to align the heat-resistant sheet 160 so that the heat-resistant sheet 160 and the multiple gas discharge holes 150a overlap each other in the Z direction. Furthermore, when the heat-resistant sheet 160 is attached to the −Z side surface of the upper case 220, gas may be emitted into the space between the +Z side surface of the battery module 100 and the −Z side surface of the heat-resistant sheet 160. Therefore, it may be difficult to place a member with relatively low heat resistance in the space between the +Z side surface of the battery module 100 and the −Z side surface of the heat-resistant sheet 160. However, in the embodiment, it is possible to suppress gas from being emitted into the space between the +Z side surface of the heat-resistant sheet 160 and the −Z side surface of the upper case 220. Therefore, in the embodiment, it is possible to easily arrange a member with relatively low heat resistance in the space between the +Z side surface of the heat-resistant sheet 160 and the −Z side surface of the upper case 220, thereby improving the degree of freedom in the layout of the members in the battery pack 10. Therefore, in the embodiment, it is possible to more easily install the heat-resistant sheet 160 compared to when the heat-resistant sheet 160 is attached to the −Z side surface of the upper case 220.

[0054] 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 other configurations can also be adopted.

[0055] For example, the heat-resistant sheet 160 and the module housing 150 do not have to be attached to each other. For example, the heat-resistant sheet 160 may be disposed on the +Z side of the +Z-side surface of the plate main body 155a without the locking portion 162, without using a bonding material such as an adhesive. Even if the heat-resistant sheet 160 is not fixed to the module housing 150, the heat-resistant sheet 160 is disposed movably with respect to the module housing 150. Therefore, when gas is discharged from the multiple gas discharge holes 150a, the heat-resistant sheet 160 is at least partially lifted toward the +Z side by the gas. This prevents the gas discharged from the multiple gas discharge holes 150a from being sprayed toward the +Z side of the heat-resistant sheet 160. Furthermore, the gas discharged from the multiple gas discharge holes 150a can flow around the Z direction of the space between the plate main body 155a and the heat-resistant sheet 160. [Explanation of symbols]

[0056] 10 battery pack, 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, 150 module housing, 150a gas exhaust hole, 151 first plate, 152 second plate, 153 third plate, 154 fourth plate, 155 fifth plate, 155a plate main body, 155b Drawer portion, 156 sixth plate, 157a structural adhesive, 157b thermally conductive adhesive, 160 heat-resistant sheet, 162 locking portion, 200 pack housing, 210 lower case, 212 lower plate, 214 side frame, 216 support frame, 218 terminal, 220 upper case, 230 sealing material, 250 storage space

Claims

1. A battery cell; a structure having a gas exhaust section that exhausts gas emitted from the battery cell; a heat-resistant body at least partially overlapping the gas exhaust portion; Equipped with The heat-resistant body is movably disposed on the structure.

2. The battery module of claim 1 , wherein the heat-resistant body and the structure are partially attached to each other.

3. The battery module according to claim 1 , wherein the heat-resistant body is flexible.

4. The battery module according to claim 1 or 2; a housing that houses the battery module; A battery pack comprising:

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