Battery pack, structure, and method for manufacturing mica plate

Abstract

Provided is a battery pack having a mica plate that is less susceptible to breakage and is lightweight. This battery pack is provided with: a module having a plurality of battery cells; a housing that accommodates the module; and a mica plate disposed between the module and the case and having a first main surface and a second main surface facing the first main surface, characterized in that the battery pack also has a fixing member for fixing the mica plate, a first hole for a fixing member is formed in the mica plate and penetrates from the first main surface to the second main surface, a connection member having a second hole for the fixing member is provided in the module and / or the housing, and the fixing member includes a head portion and a main body portion connected to the head portion. The head portion of the fixing member is positioned on the first main surface side of the mica plate, and the main body portion of the fixing member passes through the first fixing member hole portion and is inserted into the second fixing member hole portion to fix the mica plate. The head portion covers at least a part of the contour of the first fixing member hole portion and overlaps with the mica plate, and the area S1 of the portion where the head portion overlaps with the mica plate is 5.8 * 10-6 times or more of the area S2 of the mica plate.

Description

Technical Field

[0001] This invention relates to a method for manufacturing battery packs, structures, and mica panels. Background Technology

[0002] In battery packs containing multiple battery cells housed in a casing, gases and flames can sometimes be generated during thermal runaway. Such gases and flames can spread to the surrounding area, potentially inducing further thermal runaway.

[0003] To prevent the spread of gas and flame during thermal runaway, Patent Document 1 discloses a battery pack with a mica plate disposed on the surface of the module. Specifically, Patent Document 1 discloses a battery pack comprising battery modules and a mica plate for thermal insulation. The mica plate is detachably fixed to the battery modules via a connecting component, and the mica plate covers multiple battery modules. The connecting component is divided into upper and lower parts; the upper part of the connecting component fixes the mica plate to the battery modules, and the lower part of the connecting component passes through the battery modules and fixes them to a lower housing. A support component for supporting the mica plate is provided between the mica plate and the battery modules, and the support component is fixed to the upper part of the connecting component. A wear-resistant material to prevent friction loss between the retainer and the mica plate is provided between the mica plate and the retainer; the wear-resistant material is adhered to the mica plate and completely covers the retainer.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Chinese Utility Model No. 218334011 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] Previously, lightweight battery packs were required to facilitate handling. However, if a mica plate is used in the battery pack as in Patent Document 1, it would increase the weight of the battery pack.

[0009] As a method to reduce the weight of the battery pack as described in Patent Document 1, a method of thinning the mica sheet is considered. However, in Patent Document 1, rivets are used to fix the mica sheet to the battery module. Under such fixing conditions, if the battery pack is subjected to impact, the stress generated around the rivet holes becomes high. Therefore, simply thinning the mica sheet results in a decrease in the strength of the mica sheet, making the area around the rivet holes prone to breakage.

[0010] This invention was made to solve the above-mentioned problems, and the purpose of this invention is to provide a battery pack with a mica plate that is not easily damaged and is lightweight.

[0011] Methods for solving problems

[0012] That is, the battery pack of the first aspect of the present invention comprises: a module having a plurality of battery cells; a housing for housing the module; and a mica plate disposed between the module and the housing, having a first main surface and a second main surface facing the first main surface. The battery pack is characterized in that it further comprises a fixing member for fixing the mica plate, wherein a first fixing member hole is formed in the mica plate extending from the first main surface to the second main surface, and a connecting member having a second fixing member hole is provided in the module and / or the housing. The fixing member comprises a head and a main body connected to the head. The head of the fixing member is located on the first main surface side of the mica plate, and the main body of the fixing member passes through the first fixing member hole and is inserted into the second fixing member hole to fix the mica plate. When the mica plate is viewed from above in perspective, the head covers at least a portion of the outline of the first fixing member hole and overlaps with the mica plate. The area S1 of the overlapping portion of the head and the mica plate is 5.8 × 10⁻⁶ of the area S2 of the mica plate. -6 More than twice.

[0013] If a hole is provided in the mica plate and the mica plate is fixed to the hole using a fixing component having a head and a body, high stress can easily be applied around the hole when there is an impact.

[0014] However, as described in the present invention, if the ratio of area S1 to area S2 is within the above range, stress can be dispersed at the head of the fixing component, thereby mitigating stress.

[0015] In the battery pack according to the first aspect of the present invention, the fixing component may be at least one shape selected from the group consisting of rivet-shaped, spring pin-shaped, push pin-shaped, locking pin-shaped and stepped pin-shaped.

[0016] Alternatively, the fixing component may be rivet-shaped, the second fixing component hole may be a through hole, the main body of the fixing component may pass through the first fixing component hole and the second fixing component hole, and a riveting portion may be formed at the front end of the main body.

[0017] Alternatively, the fixing component may be screw-shaped, the hole of the second fixing component may be a threaded hole, and the main body of the fixing component may be screwed into the hole of the second fixing component.

[0018] Such fixing components can properly secure the mica plate.

[0019] In the battery pack of the first embodiment of the present invention, preferably, the mica plate is fixed by a plurality of the fixing components, and when the mica plate is viewed from above, the area S1n of the portion of the head of one of the fixing components that overlaps with the mica plate is greater than the opening area S3 of the hole of the first fixing component.

[0020] When the ratio of area S1n to area S3 is within the above range, the stress applied around the hole of the first fixing component can be mitigated.

[0021] The battery pack of the second aspect of the present invention comprises: a module having a plurality of battery cells; a housing for housing the module; and a mica plate disposed between the module and the housing, having a first main surface and a second main surface facing the first main surface. The battery pack is characterized in that it further comprises a fixing member for fixing the mica plate, a first fixing member hole extending from the first main surface to the second main surface is formed in the mica plate, and a connecting member having a second fixing member hole is provided in the module and / or the housing. The fixing member is rivet-shaped, comprising a head and a main body connected to the head. The head of the fixing member is located on the first main surface side of the mica plate, and the main body of the fixing member passes through the first fixing member hole and the second fixing member hole. A riveting portion is formed at the front end of the main body. When the mica plate is viewed from above in perspective, the shortest distance from the outline of the first fixing member hole to the end of the riveting portion exceeds 0 mm and is less than 22 mm.

[0022] If the shortest distance from the outline of the hole in the first fixing member to the end of the riveting part exceeds 0 mm but is less than 22 mm, stress can be dispersed.

[0023] In addition, it can prevent the fixed parts from falling off.

[0024] In the battery pack of the second aspect of the present invention, it is preferable that, when the mica plate is viewed from above, the shortest distance from the outline of the hole of the first fixing member to the end of the riveting part is longer than the shortest distance from the outline of the hole of the first fixing member to the end of the head.

[0025] With such a structure, the contact area between the riveted part and the connecting part becomes larger, which can further disperse stress.

[0026] In the battery pack of the second aspect of the present invention, the mica plate is preferably fixed by a plurality of the fixing components.

[0027] The mica plate is fixed and stable by using multiple fixing components.

[0028] In the battery packs of the first and second embodiments of the present invention, it is preferred that the mica plate is approximately quadrilateral when viewed from above, and when viewed from above, the outline of the mica plate has a first side and a second side that is opposite to the first side, and a pair of holes for the first fixing member are formed at the ends of the mica plate to which the first side and the ends of the mica plate to which the second side belongs.

[0029] If the first fixing component is positioned with a hole, the mica plate at the fixing component will be more stably fixed.

[0030] In the battery packs of the first and second embodiments of the present invention, an annular washer is disposed between the head and the mica plate, and the main body passes through the annular ring of the washer.

[0031] If gaskets are provided, the pressure during fixing can be distributed, preventing damage to the mica plate.

[0032] In addition, it can increase the area of ​​the part that overlaps with the mica plate and disperse the stress, thus relieving the stress.

[0033] In the battery packs of the first and second embodiments of the present invention, it is preferable to provide protrusions extending along a first direction on the first main surface side of the mica sheet. The natural frequency of the mica sheet is affected by the length, Young's modulus, density, cross-sectional area, and moment of second of section of the mica sheet. For example, if the moment of second of section is increased, the natural frequency becomes higher. If the natural frequency of the mica sheet is higher than the vibration of the surrounding environment, resonance does not occur, and the mica sheet is less likely to generate stress. In the battery pack of the present invention, if a specified number of protrusions are provided on the mica sheet, the moment of second of section of the mica sheet is higher than that of a flat mica sheet of the same weight. That is, the moment of second of section per unit weight of the mica sheet becomes higher. Even if the battery pack of the present invention is placed in an environment that generates vibration, the natural frequency of the mica sheet is easily higher than the vibration of the surrounding environment. Therefore, even if the mica sheet is thinned, the mica sheet is less likely to break.

[0034] In the battery packs of the first and second embodiments of the present invention, a first protrusion is preferably formed on the first main surface side of the mica plate. Compared to a flat mica plate of the same weight, this shape of mica plate has a higher moment of second of section. That is, the moment of second of section per unit weight of the mica plate is higher. Therefore, even if the battery pack of the present invention is placed in an environment that generates vibration, the natural frequency of the mica plate is likely to be higher than the vibration of the surrounding environment. Therefore, even if the mica plate is thinned, it is difficult for the mica plate to break.

[0035] In the battery packs of the first and second embodiments of the present invention, it is preferred that the thickness T of the mica plate is 0.1 mm or more and 3.0 mm or less.

[0036] In the battery pack of the present invention, the thickness of the mica plate is as thin as 0.1 mm or more and 3.0 mm or less, but as described above, the fixing member is made into a prescribed shape so that stress is not concentrated on a part of the mica plate.

[0037] Therefore, mica sheets are not easily damaged.

[0038] If the thickness T of the mica sheet is less than 0.1 mm, the mica sheet becomes too thin, thus weakening its strength and making it prone to breakage. When the thickness T of the mica sheet exceeds 3.0 mm, the mica sheet tends to become heavy.

[0039] In the battery packs of the first and second embodiments of the present invention, it is preferable that the Young's modulus of the mica sheet is 110 GPa or less. If the Young's modulus is 110 GPa or less, the flexibility of the mica sheet increases, and even if stress is generated, the stress is easily dispersed and absorbed. Therefore, the mica sheet is not easily damaged.

[0040] In the battery packs of the first and second embodiments of the present invention, a safety valve is preferably formed on the surface of the module, and the mica plate is located between the surface of the module where the safety valve is formed and the housing, with a safety valve orifice formed in the mica plate to expose the safety valve. Even if flames or gases are generated from the module due to thermal runaway, they can be released from the safety valve. In addition, the mica plate can prevent the spread of flames and gases.

[0041] In the battery packs of the first and second embodiments of the present invention, preferably, the housing consists of a receiving portion and a cover portion covering the receiving portion, the module is received in the receiving portion with the safety valve located on the side of the cover portion, and the mica plate is disposed between the module and the cover portion. Battery packs with such a structure are easy to manufacture.

[0042] The third-party structure of the present invention comprises a mica plate, a substrate, and a fixing member. The mica plate has a first main surface and a second main surface opposite to the first main surface. The mica plate has a first fixing member hole extending from the first main surface to the second main surface. The substrate is provided with a connecting member having a second fixing member hole. The fixing member fixes the mica plate. The fixing member comprises a head and a main body connected to the head. The head of the fixing member is located on the first main surface side of the mica plate. The main body of the fixing member passes through the first fixing member hole and is inserted into the second fixing member hole to fix the mica plate. When the mica plate is viewed from above, the head covers at least a portion of the outline of the first fixing member hole and overlaps with the mica plate. The area S1 of the overlapping portion of the head and the mica plate is 5.8 × 10⁻⁶ of the area S2 of the mica plate. -6 More than twice.

[0043] If a hole is provided in the mica plate and the mica plate is fixed to the hole using a fixing component having a head and a body, high stress can easily be applied around the hole when there is an impact.

[0044] However, as in this invention, if the ratio of area S1 to area S2 is within the above range, stress can be dispersed at the head of the fixing component, thus mitigating stress.

[0045] The fourth embodiment of the present invention comprises a mica plate, a substrate, and a fixing member. The mica plate has a first main surface and a second main surface facing the first main surface. The mica plate has a first fixing member hole extending from the first main surface to the second main surface. The substrate is provided with a connecting member having a second fixing member hole. The fixing member fixes the mica plate. The fixing member is characterized in that it is a rivet-shaped member comprising a head and a main body connected to the head. The head of the fixing member is located on the first main surface side of the mica plate. The main body of the fixing member passes through the first fixing member hole and the second fixing member hole. A riveting portion is formed at the front end of the main body. When the mica plate is viewed from above, the shortest distance from the outline of the first fixing member hole to the end of the riveting portion is greater than 0 mm and less than 22 mm.

[0046] If the shortest distance from the outline of the hole in the first fixing component to the end of the riveting part is greater than 0 mm and less than 22 mm, then stress can be dispersed.

[0047] In addition, it can prevent the fixed parts from falling off.

[0048] The fifth aspect of the present invention describes a method for manufacturing a mica plate, characterized by comprising the following steps: a molding step, wherein a mica plate having a first main surface and a second main surface facing the first main surface is formed by placing mica prepreg in a mold and hot pressing it; and a first fixing member hole forming step, wherein a first fixing member hole is formed on the mica plate extending from the first main surface to the second main surface.

[0049] The mica plate manufacturing method of the present invention can be used to manufacture the mica plate constituting the battery pack of the present invention.

[0050] Invention Effects

[0051] According to the present invention, it is possible to provide a battery pack having a mica plate that is not easily damaged and is lightweight. Attached Figure Description

[0052] Figure 1A This is a perspective view schematically illustrating an example of a battery pack according to a first embodiment of the present invention.

[0053] Figure 1B yes Figure 1A A sectional view along line AA.

[0054] Figure 1C yes Figure 1A The diagram shown is an exploded view of the battery pack.

[0055] Figure 2A This is a schematic cross-sectional view of an example of a fixing member and its surroundings in a battery pack according to a first embodiment of the present invention, wherein the mica plate is fixed to the module by a screw-like fixing member via a connecting member.

[0056] Figure 2B Viewed from the first principal side of the mica plate Figure 2A A top view of the fixed component and its surroundings.

[0057] Figure 3A This is a schematic cross-sectional view of an example of a fixing member and its surroundings in a battery pack according to a first embodiment of the present invention, wherein the mica plate is fixed to the module by pushing a pin-shaped fixing member via a connecting member.

[0058] Figure 3B Viewed from the first principal side of the mica plate Figure 3A A top view of the fixed component and its surroundings.

[0059] Figure 4A This is a schematic cross-sectional view of an example of a fixing member and its periphery in a battery pack according to a first embodiment of the present invention, wherein the mica plate is fixed to the module by a rivet-like fixing member via a connecting member.

[0060] Figure 4B Viewed from the first principal side of the mica plate Figure 4A A top view of the rivet-shaped fixing component and its surroundings.

[0061] Figure 5 This is a top view schematically illustrating an example of a mica plate included in a battery pack according to a first embodiment of the present invention.

[0062] Figure 6A This is a perspective view schematically illustrating an example of a mica plate, i.e. a mica plate with protrusions, included in a battery pack according to a first embodiment of the present invention.

[0063] Figure 6B This is a perspective view schematically illustrating another example of a mica plate, i.e. a mica plate with protrusions, included in a battery pack according to a first embodiment of the present invention.

[0064] Figure 7AThis is a perspective view schematically showing an example of a mica plate, i.e. a mica plate with protrusions, included in a battery pack according to a first embodiment of the present invention.

[0065] Figure 7B This is a perspective view schematically illustrating another example of a mica plate, i.e. a mica plate with protrusions, included in a battery pack according to the first embodiment of the present invention.

[0066] Figure 8A This is a cross-sectional view schematically illustrating an example of a battery pack according to a second embodiment of the present invention.

[0067] Figure 8B This is a perspective view schematically illustrating an example of a mica plate included in a battery pack according to a second embodiment of the present invention.

[0068] Figure 9 This is a cross-sectional view schematically illustrating an example of a battery pack according to a third embodiment of the present invention.

[0069] Figure 10 This is a model diagram of a mica plate designed for impact simulation.

[0070] Figure 11A This is a stress contour plot of the entire mica plate in Experiment 1-1 of the impact simulation.

[0071] Figure 11B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 1-1 in the impact simulation.

[0072] Figure 11C This is a contour plot of the overall change in the mica plate in Experiment 1-1 of the impact simulation.

[0073] Figure 12A This is a stress contour plot of the mica plate as a whole in Experiment 1-3 of the impact simulation.

[0074] Figure 12B It is a stress contour map magnified to the area where the stress of the mica plate in Experiment 1-3 of the impact simulation is the largest.

[0075] Figure 12C This is a contour plot of the overall change in the mica plate in Experiment 1-3 of the impact simulation.

[0076] Figure 13A This is a stress contour plot of the mica plate as a whole in Experiment 1-4 of the impact simulation.

[0077] Figure 13B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 1-4 in the impact simulation.

[0078] Figure 13C This is a contour plot of the overall change in the mica plate in Experiment Examples 1-4 of the impact simulation.

[0079] Figure 14A This is the overall stress contour plot of the mica plate in Experiment Example 2-1 of the impact simulation.

[0080] Figure 14B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 2-1 in the impact simulation.

[0081] Figure 14C This is a contour plot of the overall change in the mica plate in Experiment Example 2-1 of the impact simulation.

[0082] Figure 15A This is the overall stress contour plot of the mica plate in Experiment Example 2-2 of the impact simulation.

[0083] Figure 15B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 2-2 in the impact simulation.

[0084] Figure 15C This is a contour plot of the overall change in the mica plate in Experiment Example 2-2 of the impact simulation.

[0085] Figure 16A This is a stress contour plot of the mica plate as a whole in Experiment Example 2-3 of the impact simulation.

[0086] Figure 16B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 2-3 in the impact simulation.

[0087] Figure 16C This is a contour plot of the overall change in the mica plate in Experiment Example 2-3 of the impact simulation.

[0088] Figure 17A This is a stress contour plot of the mica plate as a whole in Experiment 3-1 of the impact simulation.

[0089] Figure 17B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 3-1 in the impact simulation.

[0090] Figure 17C This is a contour plot of the overall change in the mica plate in Experiment 3-1 of the impact simulation.

[0091] Figure 18A This is the overall stress contour plot of the mica plate in Experiment 3-2 of the impact simulation.

[0092] Figure 18BIt is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 3-2 in the impact simulation.

[0093] Figure 18C This is a contour plot of the overall change in the mica plate in Experiment 3-2 of the impact simulation.

[0094] Figure 19A This is the overall stress contour plot of the mica plate in Experiment 3-3 of the impact simulation.

[0095] Figure 19B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 3-3 in the impact simulation.

[0096] Figure 19C This is a contour plot of the overall change in the mica plate in Experiment 3-3 of the impact simulation.

[0097] Figure 20A This is the overall stress contour plot of the mica plate in Experiment Example 4-1 of the impact simulation.

[0098] Figure 20B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 4-1 in the impact simulation.

[0099] Figure 20C This is a contour plot of the overall change in the mica plate in Experiment 4-1 of the impact simulation.

[0100] Figure 21A This is a stress contour plot of the mica plate as a whole in Experiment 4-2 of the impact simulation.

[0101] Figure 21B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 4-2 in the impact simulation.

[0102] Figure 21C This is a contour plot of the overall change in the mica plate in Experiment Example 4-2 of the impact simulation.

[0103] Figure 22A This is a stress contour plot of the mica plate as a whole in Experiment Example 4-3 of the impact simulation.

[0104] Figure 22B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 4-3 in the impact simulation.

[0105] Figure 22C This is a contour plot of the overall change in the mica plate in Experiment 4-3 of the impact simulation.

[0106] Figure 23AThis is the overall stress contour plot of the mica plate in Experiment Example 5-1 of the impact simulation.

[0107] Figure 23B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 5-1 in the impact simulation.

[0108] Figure 23C This is a contour plot of the overall change in the mica plate in Experiment Example 5-1 of the impact simulation.

[0109] Figure 24A This is the overall stress contour plot of the mica plate in Experiment 5-2 of the impact simulation.

[0110] Figure 24B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 5-2 in the impact simulation.

[0111] Figure 24C This is a contour plot of the overall change in the mica plate in Experiment 5-2 of the impact simulation.

[0112] Figure 25A This is the overall stress contour plot of the mica plate in Experiment Example 5-3 of the impact simulation.

[0113] Figure 25B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 5-3 in the impact simulation.

[0114] Figure 25C This is a contour plot of the overall change in the mica plate in Experiment 5-3 of the impact simulation.

[0115] Figure 26A This is a stress contour plot of the mica plate as a whole in Experiment 6-1 of the impact simulation.

[0116] Figure 26B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 6-1 in the impact simulation.

[0117] Figure 26C This is a contour plot of the overall change in the mica plate in Experiment 6-1 of the impact simulation.

[0118] Figure 27A This is a stress contour plot of the mica plate as a whole in Experiment 6-2 of the impact simulation.

[0119] Figure 27B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 6-2 in the impact simulation.

[0120] Figure 27CThis is a contour plot of the overall change in the mica plate in Experiment 6-2 of the impact simulation.

[0121] Figure 28A This is a stress contour plot of the mica plate as a whole in Experiment 6-3 of the impact simulation.

[0122] Figure 28B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 6-3 in the impact simulation.

[0123] Figure 28C This is a contour plot of the overall change in the mica plate in Experiment 6-3 of the impact simulation.

[0124] Figure 29A This is the overall stress contour plot of the mica plate in Experiment 7-1 of the impact simulation.

[0125] Figure 29B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 7-1 in the impact simulation.

[0126] Figure 29C This is a contour plot of the overall change in the mica plate in Experiment 7-1 of the impact simulation.

[0127] Figure 30A This is a stress contour plot of the mica plate as a whole in Experiment 7-2 of the impact simulation.

[0128] Figure 30B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 7-2 in the impact simulation.

[0129] Figure 30C This is a contour plot of the overall change in the mica plate in Experiment 7-2 of the impact simulation.

[0130] Figure 31A This is a stress contour plot of the mica plate as a whole in Experiment 7-3 of the impact simulation.

[0131] Figure 31B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 7-3 in the impact simulation.

[0132] Figure 31C This is a contour plot of the overall change in the mica plate in Experiment Example 7-3 of the impact simulation.

[0133] Figure 32A This is a stress contour plot of the mica plate as a whole in Experiment Example 8-1 of the impact simulation.

[0134] Figure 32BIt is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 8-1 in the impact simulation.

[0135] Figure 32C This is a contour plot of the overall change in the mica plate in Experiment Example 8-1 of the impact simulation.

[0136] Figure 33A This is the overall stress contour plot of the mica plate in Experiment Example 8-2 of the impact simulation.

[0137] Figure 33B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 8-2 in the impact simulation.

[0138] Figure 33C This is a contour plot of the overall change in the mica plate in Experiment Example 8-2 of the impact simulation.

[0139] Figure 34A This is a stress contour plot of the mica plate in Experiment 8-3 of the impact simulation.

[0140] Figure 34B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 8-3 in the impact simulation.

[0141] Figure 34C This is a contour plot of the overall change in the mica plate in Experiment Example 8-3 of the impact simulation.

[0142] Figure 35A This is a stress contour plot of the mica plate as a whole in Experiment Example 9-1 of the impact simulation.

[0143] Figure 35B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 9-1 in the impact simulation.

[0144] Figure 35C This is a contour plot of the overall change in the mica plate in Experiment 9-1 of the impact simulation.

[0145] Figure 36A This is the overall stress contour plot of the mica plate in Experiment 9-2 of the impact simulation.

[0146] Figure 36B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 9-2 in the impact simulation.

[0147] Figure 36C This is a contour plot of the overall change in the mica plate in Experiment 9-2 of the impact simulation.

[0148] Figure 37AThis is a stress contour plot of the mica plate as a whole in Experiment 9-3 of the impact simulation.

[0149] Figure 37B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 9-3 in the impact simulation.

[0150] Figure 37C This is a contour plot of the overall change in the mica plate in Experiment 9-3 of the impact simulation. Detailed Implementation

[0151] (First Implementation)

[0152] Figure 1A This is a perspective view schematically illustrating an example of a battery pack according to a first embodiment of the present invention. Figure 1B yes Figure 1A A sectional view along line AA. Figure 1C yes Figure 1A The diagram shown is an exploded view of the battery pack. Figure 1A , Figure 1B and Figure 1C The battery pack 10 shown includes a module 20 having multiple battery cells 21 and a housing 30 for housing the module 20. The housing 30 is composed of a housing portion 31 and a cover portion 32 covering the housing portion 31, in which the module 20 is housed. In addition, the battery pack 10 has a mica plate 40 disposed between the module 20 and the cover portion 32.

[0153] The mica plate 40 has a first main surface 41 and a second main surface 42 opposite to the first main surface 41. The mica plate 40 is configured such that the first main surface 41 is opposite to the housing 30 and the second main surface 42 is opposite to the module 20.

[0154] The battery cell 21 stores electricity, and is preferably a rechargeable secondary battery. Examples of secondary batteries include lithium-ion batteries, nickel-metal hydride batteries, and sodium-ion batteries. Figure 1A , Figure 1B as well as Figure 1C The battery cell 21 shown is rectangular parallelepiped. However, in the battery pack of the present invention, the battery cell may also be a three-dimensional shape other than a rectangular parallelepiped (e.g., a cube or deformed shape).

[0155] In module 20, multiple battery cells 21 are arranged in a row and fixed by connecting module component 20a. In addition, battery cells 21 have terminals 21a, and adjacent battery cells 21 are electrically connected by a busbar 20b disposed on the connecting module component 20a through each terminal 21a.

[0156] Busbar 20b is a flat, conductive metal component. Materials used for busbar 20b include, for example, copper, copper alloys, stainless steel (SUS), and aluminum. Busbar 20b can also be fixed to terminal 21a by any means of fastening (e.g., threaded fastening, welding, etc.).

[0157] In module 20, a connecting member 25 having a second fixing member hole 26a is formed in the connecting module member 20a.

[0158] In addition, such as Figure 1C As shown, holes 43a for fixing components are formed at the four corners of the mica plate 40.

[0159] Furthermore, when the mica plate 40 is disposed on the connecting module component 20a, the first fixing component hole 43a is connected to the second fixing component hole 26a.

[0160] Furthermore, the mica plate 40 is fixed to the connecting module component 20a by the fixing component 60.

[0161] Materials that make up the shell 30 include steel, aluminum, etc. As steel, stainless steel (SUS) is preferred.

[0162] Next, the fixing method of the fixing component 60 will be explained.

[0163] In the battery pack 10, the fixing component 60 is in the shape of a screw, push pin, rivet, or other similar shape, having a head and a main body connected to the head.

[0164] The case where the mica plate is fixed to the module via connecting parts using screw-like fixing parts will be explained.

[0165] Figure 2A This is a schematic cross-sectional view of an example of a fixing member and its surroundings in a battery pack according to a first embodiment of the present invention, wherein the mica plate is fixed to the module by a screw-like fixing member via a connecting member.

[0166] Figure 2B Viewed from the first principal side of the mica plate Figure 2A A top view of the fixed component and its surroundings.

[0167] like Figure 2A As shown, the screw-shaped fixing member 60 includes a head 61 and a body portion 62 connected to the head 61.

[0168] In addition, such as Figure 2A As shown, a first fixing member hole 43a is formed in the mica plate 40, which extends from the first main surface 41 to the second main surface 42.

[0169] Additionally, module 20 is provided with a connecting member 25 having a second fixing member hole 26a. The second fixing member hole 26a is a threaded hole.

[0170] Furthermore, the head 61 is located on the side of the first main surface 41, the main body 62 passes through the first fixing member hole 43a and is screwed into the second fixing member hole 26a, and the screw-shaped fixing member 60 fixes the mica plate 40 to the module 20.

[0171] Furthermore, although not illustrated, the mica plate 40 can be fixed by a single screw-shaped fixing component 60 or by multiple screw-shaped fixing components 60.

[0172] The connecting component 25 can be fixed to the module 20 by screws or the like, by adhesive, or by welding.

[0173] like Figure 2B As shown, the head 61 covers the outline O of the hole 43a of the first fixing component and overlaps with the mica plate 40.

[0174] Focusing on a screw-shaped fixing component 60, if the area of ​​the portion where the head 61 overlaps with the mica plate 40 is defined as area S1n, and the sum of the areas S1n of all screw-shaped fixing components 60 is defined as S1, then area S1 is 5.8 × 10⁻⁶ of the area S2 of the mica plate 40. -6 More than twice.

[0175] If a first fixing member hole 43a is provided in the mica plate 40 and a second fixing member hole 26a is provided in the connecting member 25, and the mica plate 40 is fixed by a screw-shaped fixing member 60 having a head 61 and a body 62, then a high stress is easily applied around the first fixing member hole 43a when there is an impact.

[0176] If the ratio of area S1 to area S2 is within the above range, stress can be distributed to the head 61 of the screw-shaped fixing member 60, thus relieving stress.

[0177] As a result, the mica board 40 is not easily damaged.

[0178] In addition, the breakage resistance of mica plate 40 is also affected by the thickness of mica plate 40.

[0179] For example, when the thickness of the mica plate 40 is 1.0 mm or more, the area S1 is preferably 1.4 × 10⁻⁶ times the area S2. -3 More than twice.

[0180] Furthermore, when the thickness of the mica plate 40 is 0.5 mm or more but less than 1.0 mm, the area S1 is preferably 2.5 × 10⁻⁶ times the area S2. -3More than twice, preferably 1.3 × 10⁻⁶. -2 More than twice.

[0181] Furthermore, when the thickness of the mica plate 40 is 0.3 mm or more but less than 0.5 mm, the area S1 is preferably 6.0 × 10⁻⁶ times the area S2. -3 More than twice, preferably 1.9 × 10⁻⁶. -2 More than twice.

[0182] Furthermore, when the thickness of the mica plate 40 is 0.1 mm or more and less than 0.3 mm, the area S1 is preferably 8.1 × 10⁻⁶ times the area S2. -3 More than twice, preferably 2.4 × 10⁻⁶. -2 More than twice.

[0183] The area S1n is preferably greater than the opening area S3 of a hole 43a for a first fixing member, and more preferably greater than 1 times and less than 2.2 times the opening area S3.

[0184] When the ratio of area S1n to area S3 is within the above range, the stress applied around the hole 43a of the first fixing member can be mitigated.

[0185] The material of the screw-shaped fixing component 60 is not particularly limited; it can be aluminum, stainless steel, copper, iron, brass, titanium, resin, etc.

[0186] The diameter of the head 61 of the screw-shaped fixing member 60 is preferably 1.6 mm or more, and more preferably 3.2 mm or more.

[0187] The diameter of the main body 62 of the screw-shaped fixing member 60 can be 1.1 mm or more and less than 1.6 mm, or 2.2 mm or more and less than 3.2 mm.

[0188] The diameter of the hole 43a for the first fixing member can be greater than 1.1 mm and less than 1.5 mm, or greater than 2.2 mm and less than 3.0 mm.

[0189] The material of the connecting component 25 is not particularly limited; it can be aluminum, stainless steel, copper, or a cured resin.

[0190] The diameter of the hole 26a for the second fixing component can be greater than 1.1 mm and less than 1.5 mm, or greater than 2.2 mm and less than 3.0 mm.

[0191] In the battery pack of the present invention, it is preferable that an annular gasket is disposed between the head 61 and the mica plate 40, and the main body 62 passes through the annular gasket.

[0192] If gaskets are provided, the pressure during fixing can be distributed, preventing damage to the mica plate 40.

[0193] In addition, it can increase the area of ​​the part that overlaps with the mica plate and disperse the stress, thus relieving the stress.

[0194] Next, we will explain the case where the mica plate is fixed to the module by pushing the pin-shaped fixing component via the connecting component.

[0195] Figure 3A This is a schematic cross-sectional view of an example of a fixing member and its surroundings in a battery pack according to a first embodiment of the present invention, wherein the mica plate is fixed to the module by pushing a pin-shaped fixing member via a connecting member.

[0196] Figure 3B Viewed from the first principal side of the mica plate Figure 3A A top view of the fixed component and its surroundings.

[0197] like Figure 3A As shown, the push pin-shaped fixing member 70 includes a head 71 and a main body 72 connected to the head 71.

[0198] In addition, such as Figure 3A As shown, a first fixing member hole 43b is formed in the mica plate 40, which extends from the first main surface 41 to the second main surface 42.

[0199] Additionally, module 20 is provided with a connecting member 25 having a second fixing member hole 26b.

[0200] Furthermore, the head 71 is located on the side of the first main surface 41, and the main body 72 passes through the first fixing member hole 43b and inserts into the connecting member 25 to form the second fixing member hole 26b.

[0201] Thus, the pin-shaped fixing component 70 fixes the mica plate 40 to the module 20.

[0202] It should be noted that, although not shown in the figure, the mica plate 40 can be fixed by a single push pin-shaped fixing part 70 or by multiple push pin-shaped fixing parts 70.

[0203] The connecting component 25 can be fixed to the module 20 by screws or the like, by adhesive, or by welding.

[0204] like Figure 3B As shown, the head 71 covers the outline O of the hole 43b of the first fixing component and overlaps with the mica plate 40.

[0205] Focusing on a push pin-shaped fixing component 70, if the area of ​​the portion where the head 71 overlaps with the mica plate 40 is defined as area S1n, and the sum of the areas S1n of all push pin-shaped fixing components 70 is defined as S1, then area S1 is 5.8 × 10 of the area S2 of the mica plate 40. -6 More than twice.

[0206] If a first fixing member hole 43b is provided in the mica plate 40 and a second fixing member hole 26b is provided in the connecting member 25, and the mica plate 40 is fixed by a push pin-shaped fixing member 70 having a head 71 and a main body 72, then a high stress is easily applied around the first fixing member hole 43b when there is an impact.

[0207] If the ratio of area S1 to area S2 is within the above range, stress can be distributed to the head 71 of the push pin-shaped fixing member 70, thereby easing stress.

[0208] As a result, the mica board 40 is not easily damaged.

[0209] In addition, the breakage resistance of mica plate 40 is also affected by the thickness of mica plate 40.

[0210] For example, when the thickness of the mica plate 40 is 1.0 mm or more, the area S1 is preferably 1.4 × 10⁻⁶ times the area S2. -3 More than twice.

[0211] Furthermore, when the thickness of the mica plate 40 is 0.5 mm or more but less than 1.0 mm, the area S1 is preferably 2.5 × 10⁻⁶ times the area S2. -3 More than twice, preferably 1.3 × 10⁻⁶. -2 More than twice.

[0212] Furthermore, when the thickness of the mica plate 40 is 0.3 mm or more but less than 0.5 mm, the area S1 is preferably 6.0 × 10⁻⁶ times the area S2. -3 More than twice, preferably 1.9 × 10⁻⁶. -2 More than twice.

[0213] Furthermore, when the thickness of the mica plate 40 is 0.1 mm or more and less than 0.3 mm, the area S1 is preferably 8.1 × 10⁻⁶ times the area S2. -3 More than twice, preferably 2.4 × 10⁻⁶. -2 More than twice.

[0214] The area S1n is preferably greater than the opening area S3 of a hole 43b for a first fixing member, and more preferably greater than 1 times and less than 2.2 times the opening area S3.

[0215] When the ratio of area S1n to area S3 is within the above range, the stress applied around the hole 43b of the first fixing member can be mitigated.

[0216] The material of the push pin-shaped fixing part 70 is not particularly limited, and can be aluminum, stainless steel, copper, iron, brass, titanium, resin, etc.

[0217] The diameter of the head 71 of the push pin-shaped fixing part 70 is preferably 1.6 mm or more, and more preferably 3.2 mm or more.

[0218] The diameter of the main body 72 of the push pin-shaped fixing part 70 can be 1.1 mm or more and less than 1.6 mm, or 2.2 mm or more and less than 3.2 mm.

[0219] The diameter of the hole 43b for the first fixing member can be greater than 1.1 mm and less than 1.5 mm, or greater than 2.2 mm and less than 3.0 mm.

[0220] The material of the connecting component 25 is not particularly limited; it can be aluminum, stainless steel, copper, or a cured resin.

[0221] The diameter of the hole 26b for the second fixing component is preferably 1.5 mm or more, and more preferably 3.0 mm or more.

[0222] In the battery pack of the present invention, it is preferable that an annular gasket is disposed between the head 71 and the mica plate 40, and the main body 72 passes through the annular gasket.

[0223] If gaskets are provided, the pressure during fixing can be distributed, preventing damage to the mica plate 40.

[0224] In addition, it can increase the area of ​​the part that overlaps with the mica plate and disperse the stress, thus relieving the stress.

[0225] Next, we will explain the case where the mica plate is fixed to the module via connecting parts using rivet-like fixing parts.

[0226] Figure 4A This is a schematic cross-sectional view of an example of a fixing member and its periphery in a battery pack according to a first embodiment of the present invention, wherein the mica plate is fixed to the module by a rivet-like fixing member via a connecting member.

[0227] Figure 4B Viewed from the first principal side of the mica plate Figure 4A A top view of the rivet-shaped fixing component and its surroundings.

[0228] like Figure 4A as well as Figure 4BAs shown, the rivet-shaped fixing member 80 includes a head 81 and a main body 82 connected to the head 81. The front end of the main body 82 has a front end dividing portion 82a that is divided into four parts.

[0229] In addition, a first fixing member hole 43c is formed in the mica plate 40, which extends from the first main surface 41 to the second main surface 42.

[0230] Additionally, module 20 is provided with a connecting member 25 having a second fixing member hole 26c.

[0231] Furthermore, the head 81 is located on the side of the first main surface 41, the main body 82 passes through the first fixing member hole 43c and the second fixing member hole 26c, and the rivet-shaped fixing member 80 fixes the mica plate 40 by bending (riveting) the front end dividing part 82a of the main body 82.

[0232] Furthermore, although not shown in the figure, the mica plate 40 can be fixed by a single rivet-shaped fixing member 80 or by multiple rivet-shaped fixing members 80.

[0233] like Figure 4B As shown, the head 81 covers the outline O of the hole 43c of the first fixing component and overlaps with the mica plate 40.

[0234] Focusing on a rivet-shaped fixing component 80, if the area of ​​the overlapping portion between the head 81 and the mica plate 40 is defined as area S1n, and the sum of the areas S1n of all the rivet-shaped fixing components 80 is defined as area S1, then area S1 is 5.8 × 10 of the area S2 of the mica plate 40. -6 More than twice.

[0235] If a first fixing member hole 43c is provided in the mica plate 40, and a connecting member 25 with a second fixing member hole 26c is provided in the module 20, and the mica plate 40 is fixed by a rivet-shaped fixing member 80 with a head 81 and a body 82, then a high stress is easily applied around the first fixing member hole 43c when there is an impact.

[0236] If the ratio of area S1 to area S2 is within the above range, stress can be distributed to the head 81 of the rivet-shaped fixing member 80, thus mitigating stress.

[0237] As a result, the mica board 40 is not easily damaged.

[0238] In addition, the breakage resistance of mica plate 40 is also affected by the thickness of mica plate 40.

[0239] For example, when the thickness of the mica plate 40 is 1.0 mm or more, the area S1 is preferably 1.4 × 10⁻⁶ times the area S2. -3More than twice.

[0240] Furthermore, when the thickness of the mica plate 40 is 0.5 mm or more but less than 1.0 mm, the area S1 is preferably 2.5 × 10⁻⁶ times the area S2. -3 More than twice, preferably 1.3 × 10⁻⁶. -2 More than twice.

[0241] Furthermore, when the thickness of the mica plate 40 is 0.3 mm or more but less than 0.5 mm, the area S1 is preferably 6.0 × 10⁻⁶ times the area S2. -3 More than twice, preferably 1.9 × 10⁻⁶. -2 More than twice.

[0242] Furthermore, when the thickness of the mica plate 40 is 0.1 mm or more and less than 0.3 mm, the area S1 is preferably 8.1 × 10⁻⁶ times the area S2. -3 More than twice, preferably 2.4 × 10⁻⁶. -2 More than twice.

[0243] The connecting component 25 can be fixed to the module 20 by screws or the like, by adhesive, or by welding.

[0244] The material of the rivet-shaped fastening component 80 is not particularly limited; it can be aluminum, stainless steel, copper, iron, brass, titanium, resin, etc.

[0245] The diameter of the head 81 of the rivet-shaped fixing part 80 is preferably 1.6 mm or more, and more preferably 3.2 mm or more.

[0246] The diameter of the main body 82 of the rivet-shaped fixing part 80 can be 1.1 mm or more and less than 1.6 mm, or 2.2 mm or more and less than 3.2 mm.

[0247] The length of the front end segment 82a is preferably greater than 3 mm and less than 25 mm, more preferably greater than 6 mm and less than 17 mm.

[0248] The rivet-shaped fixing member 80 has a front end dividing portion 82a that is divided into four parts at the front end. However, in the battery pack of the present invention, the front end of the main body of the rivet-shaped fixing member can be a structure that can be riveted in a way that can fix the mica plate, and its shape is not particularly limited.

[0249] Furthermore, the shortest distance from the outline of the hole in the first fixing member to the end of the riveting part is preferably greater than 0 mm and less than 22 mm, and more preferably greater than 3 mm and less than 10 mm.

[0250] If the shortest distance from the outline of the hole in the first fixing component to the end of the riveting part is greater than 0 mm and less than 22 mm, then stress can be dispersed.

[0251] In addition, it can prevent the fixed parts from falling off.

[0252] The diameter of the hole 43c for the first fixing component can be greater than 1.1 mm and less than 1.5 mm, or greater than 2.2 mm and less than 3.0 mm.

[0253] The material of the connecting component 25 is not particularly limited; it can be aluminum, stainless steel, copper, or a cured resin.

[0254] The diameter of the hole 26c for the second fixing component can be greater than 1.1 mm and less than 1.5 mm, or greater than 2.2 mm and less than 3.0 mm.

[0255] In the battery pack of the present invention, it is preferable that an annular gasket is disposed between the head 81 and the mica plate 40, and the main body 82 passes through the annular gasket.

[0256] If gaskets are provided, the pressure during fixing can be distributed, preventing damage to the mica plate 40.

[0257] In addition, it can increase the area of ​​the part that overlaps with the mica plate and disperse the stress, thus relieving the stress.

[0258] Next, the mica plate 40 will be explained.

[0259] Figure 5 This is a top view schematically illustrating an example of a mica plate included in a battery pack according to a first embodiment of the present invention.

[0260] Figure 5 The mica plate 40 shown is rectangular when viewed from above. When viewed from above, the outline of the mica plate 40 has a first side 40a and a second side 40b that is the opposite side of the first side 40a.

[0261] A first fixing member hole 43a1 and a first fixing member hole 43a2 are formed at the end of the first side 40a of the mica plate 40.

[0262] A first fixing member hole 43a3 and a first fixing member hole 43a4 are formed at the end of the second side 40b of the mica plate 40.

[0263] The first fixing component hole 43a1 and the first fixing component hole 43a3 are paired, and the straight line connecting the two is parallel to the length direction of the mica plate 40.

[0264] In addition, the first fixing member hole 43a2 and the first fixing member hole 43a4 are paired, and the straight line connecting the two is parallel to the long side direction of the mica plate 40.

[0265] Furthermore, the shape of the mica plate 40 is preferably determined appropriately according to the shape of the battery pack.

[0266] For example, the top view shape of the mica plate 40 can be various shapes, such as triangles, quadrilaterals, circles, and shapes from which a portion of these shapes has been cut off.

[0267] The lower limit of the thickness T of the mica plate 40 is preferably 0.1 mm or more, preferably 0.3 mm or more, and more preferably 0.5 mm or more.

[0268] In addition, the upper limit of the thickness T of the mica plate 40 is preferably 3.0 mm or less, preferably 2.0 mm or less, and more preferably 1.0 mm or less.

[0269] If the thickness T of the mica plate 40 is within the above range, the weight of the mica plate 40 will be reduced, making it easier to handle.

[0270] If the thickness T of the mica plate 40 is less than 0.1 mm, the mica plate 40 becomes too thin, thus weakening its strength and making it prone to breakage.

[0271] If the thickness T of the mica plate 40 exceeds 3.0 mm, the mica plate 40 becomes heavy and difficult to use.

[0272] The Young's modulus of the mica plate 40 is preferably below 110 GPa, and more preferably 20 GPa to 80 GPa.

[0273] If the Young's modulus is below 110 GPa, the flexibility of the mica plate 40 becomes higher, and even if stress is generated, the stress is easily dispersed and absorbed.

[0274] Therefore, mica board 40 is not easily damaged.

[0275] The preferred density of mica plate 40 is 1.3 g / cm³. 3 ~2.7g / cm 3 More preferably 1.7 g / cm³ 3 ~2.3g / cm 3 .

[0276] Alternatively, protrusions or ridges can be formed on the mica plate 40.

[0277] This method is illustrated with accompanying drawings.

[0278] Figure 6A This is a perspective view schematically illustrating an example of a mica plate, i.e. a mica plate with protrusions, included in a battery pack according to a first embodiment of the present invention.

[0279] exist Figure 6A In the mica plate 140 shown, a plurality of protrusions 151 are formed on the side of the first main surface 141.

[0280] In addition, the protrusion 151 is shaped like a mountain bend.

[0281] If the mica plate 140 has a protrusion 151, the second moment of the cross section of the mica plate 140 can be increased.

[0282] In addition, the protrusion 151 is zigzag-shaped, which enables weight reduction compared to the case of protrusion stacking.

[0283] Furthermore, if the second moment of cross-section of the mica plate 140 is increased, the mica plate 140 will not be easily damaged even if the battery pack with the mica plate 140 is placed in an environment that generates vibration.

[0284] The principle is explained below.

[0285] If the natural frequency of the mica sheet is the same as the vibration frequency of the surrounding environment, resonance will occur, and the mica sheet will be easily damaged. However, if the natural frequency of the mica sheet is higher than the vibration frequency of the surrounding environment, resonance will not occur, and the mica sheet will hardly generate stress.

[0286] The natural frequency of a mica plate is affected by its length, Young's modulus, density, cross-sectional area, and the second moment of its cross section.

[0287] For example, the natural frequency ω of an object when its two ends are fixed can be calculated using the following general formula (1).

[0288]

[0289] (In general formula (1), l is the length, E is the Young's modulus, I is the second moment of the section, ρ is the density, and A is the cross-sectional area.)

[0290] For example, if the second moment of the cross section is increased, the natural frequency will increase.

[0291] Because the mica plate 140 has multiple protrusions 151, its section moment of second magnitude is higher compared to a flat mica plate of the same weight. That is, the section moment of second magnitude per unit weight of the mica plate 140 is higher.

[0292] Therefore, even when the battery pack is placed in an environment that generates vibration, the natural frequency of the mica plate 140 is likely to be higher than the vibration of the surrounding environment. As a result, the mica plate 140 is not easily damaged.

[0293] Figure 6B This is a perspective view schematically illustrating another example of a mica plate, i.e. a mica plate with protrusions, included in a battery pack according to a first embodiment of the present invention.

[0294] exist Figure 6B The mica plate 240 shown has the same shape as the mica plate 140 described above, except for the stacking of the protrusions 251.

[0295] Even with this shape, the second moment of the cross section of mica plate 240 is higher, so mica plate 240 is not easily damaged.

[0296] It should be noted that, in the above Figure 6A and Figure 6B In the mica plates (140, 240) shown, a plurality of protrusions are formed on the first main surface side of the mica plate. However, in the battery pack of the first embodiment of the present invention, a single protrusion may also be formed on the first main surface side of the mica plate.

[0297] In addition, in the battery pack of the first embodiment of the present invention, a protrusion may also be formed on the second main surface side of the mica plate.

[0298] In addition, in the above Figure 6A as well as Figure 6B In the mica plate shown, protrusions are formed along the long side of the mica plate. However, in the battery pack of the first embodiment of the present invention, the direction in which the protrusions are formed is not particularly limited. For example, the protrusions may also be formed along the short side of the mica plate.

[0299] Even with this method, the second moment of the mica sheet's cross-section increases. Therefore, the mica sheet is less prone to breakage.

[0300] Figure 7A This is a perspective view schematically showing an example of a mica plate, i.e. a mica plate with protrusions, included in a battery pack according to a first embodiment of the present invention.

[0301] exist Figure 7A In the mica plate 340 shown, a plurality of first protrusions 356 are formed on the first main surface 341 side, and a plurality of second protrusions 357 are formed on the second main surface 342 side.

[0302] The first protrusion 356 is a square pyramid shape, formed by the mica plate 340 being recessed from the second main surface 342 side to the first main surface 341 side.

[0303] The second protrusion 357 is a square pyramid shape, formed by the indentation of the mica plate 340 from the side of the first main surface 341 to the side of the second main surface 342.

[0304] Furthermore, when viewed from above, the first protrusion 356 and the second protrusion 357 are arranged alternately in a straight line.

[0305] That is, the first protrusion 356 and the second protrusion 357 are formed in a checkered pattern.

[0306] Because the mica plate 340 has multiple first protrusions 356 and second protrusions 357, its section moment of second is higher compared to a flat mica plate of the same weight. That is, the section moment of second per unit weight of the mica plate 340 is higher.

[0307] Therefore, even when the battery pack is placed in an environment that generates vibration, the natural frequency of the mica plate 340 is likely to be higher than the vibration of the surrounding environment. As a result, the mica plate 340 is not easily damaged.

[0308] Figure 7B This is a perspective view schematically illustrating another example of a mica plate, i.e. a mica plate with protrusions, included in a battery pack according to the first embodiment of the present invention.

[0309] exist Figure 7B The mica plate 440 shown has the same shape as the mica plate 340 described above, except that the first protrusion 456 and the second protrusion 457 are stacked together.

[0310] Even with this shape, the second moment of the cross section of mica plate 440 is higher, so mica plate 440 is not easily damaged.

[0311] It should be noted that, in the above Figure 7A and Figure 7B The mica plates (340, 440) shown have multiple first protrusions and multiple second protrusions. However, in the battery pack of the first embodiment of the present invention, multiple first protrusions may be formed, or only one first protrusion may be formed.

[0312] In addition, in the above Figure 7A and Figure 7B In the mica plate shown, the first and second protrusions are in the shape of a quadrangular pyramid. However, in the battery pack of the first embodiment of the present invention, as long as the first and second protrusions are convex, their shapes are not particularly limited. For example, they can be conical, triangular pyramidal, or other pyramidal shapes. In addition, the first and second protrusions can also be cylindrical, triangular prism, quadrangular prism, or other columnar shapes.

[0313] Even with this method, the second moment of the mica sheet's cross-section increases. Therefore, the mica sheet is less prone to breakage.

[0314] Next, the method for manufacturing the mica plate included in the battery pack of the present invention will be described.

[0315] The method for manufacturing mica sheets is characterized by comprising the following steps: a molding step, in which mica prepreg is placed in a mold and hot-pressed to form a mica sheet having a first main surface and a second main surface opposite to the first main surface; and a first fixing member hole forming step, in which a first fixing member hole is formed on the mica sheet extending from the first main surface to the second main surface.

[0316] As for the mold used in the molding process, there are no particular limitations as long as it is a mold that makes the molded mica board into a plate shape having a first main surface and a second main surface opposite to the first main surface.

[0317] It should be noted that, in the case of wanting to form a first protrusion on the first main surface of the mica plate, a mold can be used, for example, that includes an upper part with a concave portion and a lower part with a protrusion portion and is formed by the concave portion and the protrusion portion fitting together.

[0318] If mica prepreg is placed between the upper and lower parts of such a mold and hot-pressed, a first protrusion is formed in the part sandwiched between the concave and convex parts.

[0319] There are no particular restrictions on the conditions for hot pressing, but conditions such as 5 to 60 minutes, pressure below 15 MPa, and temperature between 100°C and 300°C can be given.

[0320] In the process of forming a hole for the first fixing component, for example, when a screw-shaped component is used as the fixing component, a thread can be cut by tapping to form a hole for the first fixing component as a threaded hole.

[0321] Alternatively, when using a push pin-shaped component as a fixing component, a hole for the first fixing component can be formed by inserting the push pin-shaped fixing component into the mica plate and making it pass through.

[0322] Alternatively, a hole can be made by using a drill bit or the like, through which the main body of the fixing component passes, to form a hole for the first fixing component.

[0323] Alternatively, in the molding process, a mold with a hole through which the main body of the fixing component passes can be used to form the hole for the first fixing component. In this case, the molding process and the hole-forming process for the first fixing component are performed simultaneously.

[0324] (Second Implementation)

[0325] Next, the battery pack according to the second embodiment of the present invention will be described.

[0326] The battery pack of the second embodiment of the present invention differs from the battery pack of the first embodiment described above in that a safety valve is formed on the surface of the module, and a safety valve hole is formed on the mica plate to expose the safety valve.

[0327] The accompanying diagram illustrates this type of battery pack.

[0328] Figure 8A This is a cross-sectional view schematically illustrating an example of a battery pack according to a second embodiment of the present invention.

[0329] Figure 8B This is a perspective view schematically illustrating an example of a mica plate included in a battery pack according to a second embodiment of the present invention.

[0330] Figure 8AThe battery pack 510 shown includes: a module 520 having multiple battery cells 521, and a housing 530 for storing the module 520.

[0331] The housing 530 consists of a storage section 531 and a cover section 532 that covers the storage section 531. The module 520 is stored in the storage section 531.

[0332] Additionally, the battery pack 510 has a mica plate 540 disposed between the module 520 and the cover 532.

[0333] In module 520, multiple battery cells 521 are fixed by connecting module component 520a.

[0334] In the battery pack 510, a safety valve 520c is formed on the connecting module component 520a, which becomes module 520.

[0335] In addition, such as Figure 8A as well as Figure 8B As shown, a safety valve hole 545 is formed in the mica plate 540 to expose the safety valve 520c.

[0336] Even if flames or gases are generated from the module due to thermal runaway, they can be released from the safety valve.

[0337] In addition, the mica plate can prevent the spread of flames and gases.

[0338] A first fixing member hole 543a is formed in the mica plate 540, which extends from the first main surface to the second main surface.

[0339] In addition, the connecting module component 520a is provided with a connecting component 525 having a second fixing component hole. When the mica plate 540 is placed on the connecting module component 520a, the first fixing component hole 543a is connected to the second fixing component hole.

[0340] Furthermore, the mica plate 540 is fixed to the connecting module component 520a by a fixing component (not shown) having a head and a main body.

[0341] The head of the fixing component covers the outline of the hole 543a of the first fixing component and overlaps with the mica plate 540.

[0342] Focusing on a screw-shaped fixing component, if we define the area of ​​the portion overlapping the head with the mica plate 540 as area S1n, and the sum of the areas S1n of all screw-shaped fixing components as S1, then area S1 is 5.8 × 10⁻⁶ of the area S2 of the mica plate 540. -6 More than twice.

[0343] If a first fixing member hole 543a is provided in the mica plate 540, and a connecting member with a second fixing member hole is provided in the module 520, and the mica plate 540 is fixed by the fixing member, then a high stress is easily applied around the first fixing member hole 543a when there is an impact.

[0344] If the ratio of area S1 to area S2 is within the above range, stress can be dispersed at the head of the fixed component, thus mitigating stress.

[0345] As a result, the mica board 540 is not easily damaged.

[0346] Furthermore, when calculating the area S2 of the mica plate 540, the safety valve uses the hole 545 as the hole to be filled and the area S2 is calculated.

[0347] In addition, the breakage resistance of mica sheet 540 is also affected by the thickness of mica sheet 540.

[0348] For example, when the thickness of the mica plate 540 is 1.0 mm or more, the area S1 is preferably 1.4 × 10⁻⁶ times the area S2. -3 More than twice.

[0349] Furthermore, when the thickness of the mica plate 540 is 0.5 mm or more but less than 1.0 mm, the area S1 is preferably 2.5 × 10⁻⁶ times the area S2. -3 More than twice, preferably 1.3 × 10⁻⁶. -2 More than twice.

[0350] Furthermore, when the thickness of the mica plate 540 is 0.3 mm or more but less than 0.5 mm, the area S1 is preferably 6.0 × 10⁻⁶ times the area S2. -3 More than twice, preferably 1.9 × 10⁻⁶. -2 More than twice.

[0351] Furthermore, when the thickness of the mica plate 540 is 0.1 mm or more and less than 0.3 mm, the area S1 is preferably 8.1 × 10⁻⁶ times the area S2. -3 More than twice, preferably 2.4 × 10⁻⁶. -2 More than twice.

[0352] The preferred materials and shapes of the battery cell 521, housing 530, mica plate 540, and fixing components in the battery pack 510 are the same as those of the battery cell 21, housing 30, mica plate 40, and fixing components in the battery pack 10 of the first embodiment of the present invention.

[0353] (Third Implementation)

[0354] Next, the battery pack according to the third embodiment of the present invention will be described.

[0355] The battery pack in the third embodiment of the present invention may also be configured such that the mica plate covers the entire circumference of the module.

[0356] The accompanying diagram illustrates this type of battery pack.

[0357] Figure 9 This is a cross-sectional view schematically illustrating an example of a battery pack according to a third embodiment of the present invention.

[0358] Figure 9 The battery pack 610 shown includes a module 620 having multiple battery cells 621 and a housing 630 for storing the module 620.

[0359] The housing 630 consists of a storage section 631 and a cover section 632 that covers the storage section 631. The module 620 is stored in the storage section 631.

[0360] In module 620, multiple battery cells 621 are fixed by connecting module component 620a.

[0361] A first fixing member hole (not shown) is formed in the mica plate 640, which extends from the first main surface to the second main surface.

[0362] In addition, the connecting module component 620a is provided with a connecting component 625 having a second fixing component hole. When the mica plate 640 is placed on the connecting module component 620a, the first fixing component hole is connected to the second fixing component hole.

[0363] Furthermore, the mica plate 640 is fixed to the connecting module component 620a by a fixing component (not shown) having a head and a main body.

[0364] The head of the fixing component covers the outline of the hole of the first fixing component and overlaps with the mica plate 640.

[0365] Focusing on a screw-shaped fixing component, if we define the area of ​​the portion overlapping the head with the mica plate 640 as area S1n, and the sum of the areas S1n of all screw-shaped fixing components as area S1, then area S1 is 5.8 × 10⁻⁶ of the area S2 of the mica plate 640. -6 More than twice.

[0366] If a first fixing member hole is provided in the mica plate 640, and a connecting member with a second fixing member hole is provided in the module 620, and the mica plate 640 is fixed by the fixing member, then a high stress is easily applied around the first fixing member hole when there is an impact.

[0367] If the ratio of area S1 to area S2 is within the above range, stress can be dispersed at the head of the fixed component, thus mitigating stress.

[0368] As a result, the mica board 640 is not easily damaged.

[0369] In addition, the breakage resistance of mica sheet 640 is also affected by the thickness of mica sheet 640.

[0370] For example, when the thickness of the mica plate 640 is 1.0 mm or more, the area S1 is preferably 1.4 × 10⁻⁶ times the area S2. -3 More than twice.

[0371] Furthermore, when the thickness of the mica plate 640 is 0.5 mm or more but less than 1.0 mm, the area S1 is preferably 2.5 × 10⁻⁶ times the area S2. -3 More than twice, preferably 1.3 × 10⁻⁶. -2 More than twice.

[0372] Furthermore, when the thickness of the mica plate 640 is 0.3 mm or more and less than 0.5 mm, the area S1 is preferably 6.0 × 10⁻⁶ times the area S2. -3 More than twice, preferably 1.9 × 10⁻⁶. -2 More than twice.

[0373] Furthermore, when the thickness of the mica plate 640 is 0.1 mm or more and less than 0.3 mm, the area S1 is preferably 8.1 × 10⁻⁶ times the area S2. -3 More than twice, preferably 2.4 × 10⁻⁶. -2 More than twice.

[0374] In the battery pack 610, the entire periphery of module 620 is covered by mica plate 640.

[0375] If the mica plate 640 covers the entire circumference of the module 620, then regardless of the location where the flame or gas is generated, the mica plate 640 can prevent the flame or gas from spreading.

[0376] As a method of covering the entire circumference of module 620 with mica plate 640, one example is to form mica plate 640 into multiple parts and arrange each part around module 620.

[0377] The preferred materials of the battery cell 621, housing 630, mica plate 640 and fixing component in the battery pack 610 are the same as those of the preferred materials of the battery cell 21, housing 30, mica plate 40 and fixing component 60 in the battery pack 10 of the first embodiment of the present invention.

[0378] (Other implementation methods)

[0379] In the battery packs described in the first to third embodiments, the housing is composed of a storage part and a cover part. However, in the battery pack of the present invention, as long as the module can be stored, the shape of the housing is not particularly limited. For example, it can be a shape with only a storage part and no cover part, or it can be a square tube or a cylindrical shape.

[0380] In the battery pack described in the first embodiment, an example of the connecting member being fixed to the module was illustrated. However, in the battery pack of the present invention, the connecting member may also be fixed to the housing.

[0381] In the battery pack described in the first embodiment, adjacent battery cells are electrically connected by a busbar. However, in the battery pack of the present invention, adjacent battery cells can be electrically connected, for example, by copper wire or a cured conductive paste.

[0382] In the battery pack described in the first embodiment, in the description of the rivet-shaped connecting member, it is specified that the area S1 is 5.8 × 10⁻⁶ times the area S2. -6 The description covers rivet-shaped connecting parts that are more than twice the length of the first fixing member and whose shortest distance from the outline of the hole in the first fixing member to the end of the riveting part is greater than 0 mm and less than 22 mm.

[0383] However, in the battery pack of the present invention, as long as the area S1 is 5.8 × 10 of the area S2, -6 It is acceptable if at least one of the following is true: more than twice the length of the first fixing member and the shortest distance from the outline of the hole in the first fixing member to the end of the riveting part is greater than 0 mm and less than 22 mm.

[0384] The following matters are disclosed in this specification.

[0385] The present invention (1) is a battery pack comprising: a module having a plurality of battery cells; a housing for housing the module; and a mica plate disposed between the module and the housing, having a first main surface and a second main surface facing the first main surface, characterized in that the battery pack further comprises a fixing member for fixing the mica plate, wherein a first fixing member hole is formed in the mica plate extending from the first main surface to the second main surface, and a connecting member having a second fixing member hole is provided in the module and / or the housing, the fixing member comprising a head and a main body connected to the head, the head of the fixing member being located on the first main surface side of the mica plate, the main body of the fixing member passing through the first fixing member hole and inserted into the second fixing member hole to fix the mica plate, wherein when the mica plate is viewed from above, the head covers at least a portion of the outline of the first fixing member hole and overlaps with the mica plate, and the area S1 of the overlapping portion of the head and the mica plate is 5.8 × 10⁻⁶ of the area S2 of the mica plate.-6 More than twice.

[0386] The present invention (2) is the battery pack described in the present invention (1), wherein the fixing component is at least one shape selected from the group consisting of rivet, spring pin, push pin, locking pin and stepped pin.

[0387] The present invention (3) is the battery pack described in the present invention (1), wherein the fixing component is rivet-shaped, the second fixing component hole is a through hole, the main body of the fixing component passes through the first fixing component hole and the second fixing component hole, and a riveting part is formed at the front end of the main body.

[0388] The present invention (4) is the battery pack described in the present invention (1), wherein the fixing component is screw-shaped, the second fixing component hole is a threaded hole, and the main body of the fixing component is screwed into the second fixing component hole.

[0389] The present invention (5) is a battery pack according to any one of the present inventions (1) to (4), wherein the mica plate is fixed by a plurality of the fixing components, and when the mica plate is viewed from above, the area S1n of the part of the head of one of the fixing components that overlaps with the mica plate is greater than the opening area S3 of the hole of the first fixing component.

[0390] The present invention (6) is a battery pack comprising: a module having a plurality of battery cells; a housing for housing the module; and a mica plate disposed between the module and the housing, having a first main surface and a second main surface facing the first main surface, characterized in that the battery pack further comprises a fixing member for fixing the mica plate, wherein a first fixing member hole is formed in the mica plate extending from the first main surface to the second main surface, and a connecting member having a second fixing member hole is provided in the module and / or the housing, the fixing member being rivet-shaped including a head and a main body connected to the head, the head of the fixing member being located on the first main surface side of the mica plate, the main body of the fixing member passing through the first fixing member hole and the second fixing member hole, and a riveting portion being formed at the front end of the main body, wherein when the mica plate is viewed from above, the shortest distance from the outline of the first fixing member hole to the end of the riveting portion is greater than 0 mm and less than 22 mm.

[0391] The present invention (7) is the battery pack described in the present invention (6), wherein, when the mica plate is viewed from above, the shortest distance from the outline of the hole of the first fixing member to the end of the riveting part is longer than the shortest distance from the outline of the hole of the first fixing member to the end of the head.

[0392] The present invention (8) is the battery pack described in the present invention (6) or (7), wherein the mica plate is fixed by a plurality of the fixed components.

[0393] The present invention (9) is a battery pack according to any one of the present inventions (1) to (8), wherein the mica plate is approximately quadrilateral when viewed from above, and when viewed from above, the outline of the mica plate has a first side and a second side as the opposite side of the first side, and a pair of holes for the first fixing member are formed at the end of the first side and the end of the second side in the mica plate.

[0394] The present invention (10) is a battery pack according to any one of the present inventions (1) to (9), wherein an annular gasket is disposed between the head and the mica plate, and the main body passes through the annular gasket.

[0395] The present invention (11) is a battery pack of any combination of the present invention (1) to (10), wherein a protrusion is provided on the first main surface side of the mica plate extending in a first direction.

[0396] The present invention (12) is a battery pack according to any one of the present inventions (1) to (10), wherein a first protrusion is formed on the first main surface side of the mica plate.

[0397] The present invention (13) is a battery pack according to any one of the present invention (1) to (12), wherein the thickness T of the mica plate is 0.1 mm or more and 3.0 mm or less.

[0398] The present invention (14) is a battery pack according to any one of the present inventions (1) to (13), wherein the Young's modulus of the mica plate is less than 110 GPa.

[0399] The present invention (15) is a battery pack according to any one of the present inventions (1) to (14), wherein a safety valve is formed on the surface of the module, the mica plate is located between the surface of the module on which the safety valve is formed and the housing, and a safety valve hole is formed on the mica plate to expose the safety valve.

[0400] The present invention (16) is the battery pack described in the present invention (15), wherein the housing is composed of a storage part and a cover part covering the storage part, the module is stored in the storage part with the safety valve located on the side of the cover part, and the mica plate is disposed between the module and the cover part.

[0401] The present invention (17) is a structure comprising a mica plate, a substrate, and a fixing component. The mica plate has a first main surface and a second main surface opposite to the first main surface. The mica plate has a first fixing component hole extending from the first main surface to the second main surface. The substrate is provided with a connecting component having a second fixing component hole. The fixing component fixes the mica plate. The fixing component comprises a head and a main body connected to the head. The head of the fixing component is located on the first main surface side of the mica plate. The main body of the fixing component passes through the first fixing component hole and is inserted into the second fixing component hole to fix the mica plate. When the mica plate is viewed from above, the head covers at least a portion of the outline of the first fixing component hole and overlaps with the mica plate. The area S1 of the overlapping portion of the head and the mica plate is 5.8 × 10⁻⁶ of the area S2 of the mica plate. -6 More than twice.

[0402] The present invention (18) is a structure comprising a mica plate, a substrate, and a fixing component. The mica plate has a first main surface and a second main surface opposite to the first main surface. The mica plate has a first fixing component hole extending from the first main surface to the second main surface. The substrate is provided with a connecting component having a second fixing component hole. The fixing component fixes the mica plate. The fixing component is characterized in that it is a rivet-shaped component comprising a head and a main body connected to the head. The head of the fixing component is located on the first main surface side of the mica plate. The main body of the fixing component passes through the first fixing component hole and the second fixing component hole. A riveting portion is formed at the front end of the main body. When the mica plate is viewed from above, the shortest distance from the outline of the first fixing component hole to the end of the riveting portion is greater than 0 mm and less than 22 mm.

[0403] The present invention (19) is a method for manufacturing a mica board, characterized in that it includes the following steps: a molding step, in which mica prepreg is placed in a mold and hot-pressed to form a mica board having a first main surface and a second main surface facing the first main surface; and a first fixing member hole forming step, in which a first fixing member hole is formed on the mica board extending from the first main surface to the second main surface.

[0404] [Example]

[0405] To determine the stress applied when the first fixing component is fixed in place by the hole formed in the mica plate, the following simulation model was designed and impact simulation was performed.

[0406] Figure 10 This is a model diagram of a mica plate designed for impact simulation.

[0407] Figure 10 The mica plate 740 shown has a rectangular shape when viewed from above, with a length of 500 mm along the long side and a length of 120 mm along the short side.

[0408] like Figure 10 As shown, the two ends of the short side of the mica plate 740 are bent downwards, and the width of the bent portion ( Figure 10 In the figure, the distance indicated by the symbol "w" is 20mm.

[0409] like Figure 10 As shown, three racetrack-shaped openings (safety valve holes) 745 are formed on the mica plate 740.

[0410] The shape of the runway-shaped opening 745 is a rectangle with two short sides of length × width = 30mm × 80mm, connected by a semicircle with a diameter of 30mm.

[0411] In addition, the openings 745 of each runway type are arranged such that the center of gravity of each opening 745 is located at the center of the short side of the mica plate 740 and at a distance of 135mm, 250mm and 365mm from the end of the long side of the mica plate 740.

[0412] Additionally, the mica plate 740 is located 10mm from the ends along its two long sides. Figure 10 The position of the distance indicated by the symbol "d1" in the middle, and the distance from the ends of the two short sides in the direction of 40mm ( Figure 10 In the middle, at the distance indicated by the symbol "d2", four holes 743a for the first fixing component are formed.

[0413] Additionally, the mica plate 740 is located 50mm from the ends along its two long sides. Figure 10 The position of the distance indicated by the symbol "d3" in the middle, and the distance from the ends of the two short sides in the direction of 40mm ( Figure 10 In the middle, at the distance indicated by the symbol "d2", four holes 743a for the first fixing component are formed.

[0414] That is, eight holes 743a for first fixing components are formed in the mica plate 740.

[0415] The hole 743a for the first fixing component is circular when viewed from above, and its size is set to a diameter of 3.4 mm.

[0416] In addition, as a fixing component for fixing the mica plate 740, a main body with a diameter of 3.2 mm and a circular head connected to the main body are provided.

[0417] The density, Young's modulus, thickness, and head area of ​​the fixed component when viewed from the head side are set as shown in Table 1.

[0418] [Table 1]

[0419] The stress on mica plate 740 was simulated under an impact of 30G and 12ms in the thickness direction. Ansys LS-DYNA was used as the simulation software.

[0420] The maximum stress and variation generated in each of the set mica plates 740 in this simulation are shown in Table 1.

[0421] Additionally, the accompanying figures show the stress contour plot and the change contour plot from the simulation.

[0422] Figure 11A This is a stress contour plot of the entire mica plate in Experiment 1-1 of the impact simulation.

[0423] Figure 11B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 1-1 in the impact simulation.

[0424] Figure 11C This is a contour plot of the overall change in the mica plate in Experiment 1-1 of the impact simulation.

[0425] Figure 12A This is a stress contour plot of the mica plate as a whole in Experiment 1-3 of the impact simulation.

[0426] Figure 12B It is a stress contour map magnified to the area where the stress of the mica plate in Experiment 1-3 of the impact simulation is the largest.

[0427] Figure 12C This is a contour plot of the overall change in the mica plate in Experiment 1-3 of the impact simulation.

[0428] Figure 13A This is a stress contour plot of the mica plate as a whole in Experiment 1-4 of the impact simulation.

[0429] Figure 13B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 1-4 in the impact simulation.

[0430] Figure 13C This is a contour plot of the overall change in the mica plate in Experiment Examples 1-4 of the impact simulation.

[0431] Figure 14AThis is the overall stress contour plot of the mica plate in Experiment Example 2-1 of the impact simulation.

[0432] Figure 14B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 2-1 in the impact simulation.

[0433] Figure 14C This is a contour plot of the overall change in the mica plate in Experiment Example 2-1 of the impact simulation.

[0434] Figure 15A This is the overall stress contour plot of the mica plate in Experiment Example 2-2 of the impact simulation.

[0435] Figure 15B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 2-2 in the impact simulation.

[0436] Figure 15C This is a contour plot of the overall change in the mica plate in Experiment Example 2-2 of the impact simulation.

[0437] Figure 16A This is a stress contour plot of the mica plate as a whole in Experiment Example 2-3 of the impact simulation.

[0438] Figure 16B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 2-3 in the impact simulation.

[0439] Figure 16C This is a contour plot of the overall change in the mica plate in Experiment Example 2-3 of the impact simulation.

[0440] Figure 17A This is a stress contour plot of the mica plate as a whole in Experiment 3-1 of the impact simulation.

[0441] Figure 17B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 3-1 in the impact simulation.

[0442] Figure 17C This is a contour plot of the overall change in the mica plate in Experiment 3-1 of the impact simulation.

[0443] Figure 18A This is the overall stress contour plot of the mica plate in Experiment 3-2 of the impact simulation.

[0444] Figure 18B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 3-2 in the impact simulation.

[0445] Figure 18CThis is a contour plot of the overall change in the mica plate in Experiment 3-2 of the impact simulation.

[0446] Figure 19A This is the overall stress contour plot of the mica plate in Experiment 3-3 of the impact simulation.

[0447] Figure 19B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 3-3 in the impact simulation.

[0448] Figure 19C This is a contour plot of the overall change in the mica plate in Experiment 3-3 of the impact simulation.

[0449] Figure 20A This is the overall stress contour plot of the mica plate in Experiment Example 4-1 of the impact simulation.

[0450] Figure 20B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 4-1 in the impact simulation.

[0451] Figure 20C This is a contour plot of the overall change in the mica plate in Experiment 4-1 of the impact simulation.

[0452] Figure 21A This is a stress contour plot of the mica plate as a whole in Experiment 4-2 of the impact simulation.

[0453] Figure 21B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 4-2 in the impact simulation.

[0454] Figure 21C This is a contour plot of the overall change in the mica plate in Experiment Example 4-2 of the impact simulation.

[0455] Figure 22A This is a stress contour plot of the mica plate as a whole in Experiment Example 4-3 of the impact simulation.

[0456] Figure 22B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 4-3 in the impact simulation.

[0457] Figure 22C This is a contour plot of the overall change in the mica plate in Experiment 4-3 of the impact simulation.

[0458] Figure 23A This is the overall stress contour plot of the mica plate in Experiment Example 5-1 of the impact simulation.

[0459] Figure 23BIt is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 5-1 in the impact simulation.

[0460] Figure 23C This is a contour plot of the overall change in the mica plate in Experiment Example 5-1 of the impact simulation.

[0461] Figure 24A This is the overall stress contour plot of the mica plate in Experiment 5-2 of the impact simulation.

[0462] Figure 24B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 5-2 in the impact simulation.

[0463] Figure 24C This is a contour plot of the overall change in the mica plate in Experiment 5-2 of the impact simulation.

[0464] Figure 25A This is the overall stress contour plot of the mica plate in Experiment Example 5-3 of the impact simulation.

[0465] Figure 25B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 5-3 in the impact simulation.

[0466] Figure 25C This is a contour plot of the overall change in the mica plate in Experiment 5-3 of the impact simulation.

[0467] Figure 26A This is a stress contour plot of the mica plate as a whole in Experiment 6-1 of the impact simulation.

[0468] Figure 26B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 6-1 in the impact simulation.

[0469] Figure 26C This is a contour plot of the overall change in the mica plate in Experiment 6-1 of the impact simulation.

[0470] Figure 27A This is a stress contour plot of the mica plate as a whole in Experiment 6-2 of the impact simulation.

[0471] Figure 27B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 6-2 in the impact simulation.

[0472] Figure 27C This is a contour plot of the overall change in the mica plate in Experiment 6-2 of the impact simulation.

[0473] Figure 28AThis is a stress contour plot of the mica plate as a whole in Experiment 6-3 of the impact simulation.

[0474] Figure 28B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 6-3 in the impact simulation.

[0475] Figure 28C This is a contour plot of the overall change in the mica plate in Experiment 6-3 of the impact simulation.

[0476] Figure 29A This is the overall stress contour plot of the mica plate in Experiment 7-1 of the impact simulation.

[0477] Figure 29B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 7-1 in the impact simulation.

[0478] Figure 29C This is a contour plot of the overall change in the mica plate in Experiment 7-1 of the impact simulation.

[0479] Figure 30A This is a stress contour plot of the mica plate as a whole in Experiment 7-2 of the impact simulation.

[0480] Figure 30B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 7-2 in the impact simulation.

[0481] Figure 30C This is a contour plot of the overall change in the mica plate in Experiment 7-2 of the impact simulation.

[0482] Figure 31A This is a stress contour plot of the mica plate as a whole in Experiment 7-3 of the impact simulation.

[0483] Figure 31B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 7-3 in the impact simulation.

[0484] Figure 31C This is a contour plot of the overall change in the mica plate in Experiment Example 7-3 of the impact simulation.

[0485] Figure 32A This is a stress contour plot of the mica plate as a whole in Experiment Example 8-1 of the impact simulation.

[0486] Figure 32B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 8-1 in the impact simulation.

[0487] Figure 32CThis is a contour plot of the overall change in the mica plate in Experiment Example 8-1 of the impact simulation.

[0488] Figure 33A This is the overall stress contour plot of the mica plate in Experiment Example 8-2 of the impact simulation.

[0489] Figure 33B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 8-2 in the impact simulation.

[0490] Figure 33C This is a contour plot of the overall change in the mica plate in Experiment Example 8-2 of the impact simulation.

[0491] Figure 34A This is a stress contour plot of the mica plate in Experiment 8-3 of the impact simulation.

[0492] Figure 34B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 8-3 in the impact simulation.

[0493] Figure 34C This is a contour plot of the overall change in the mica plate in Experiment Example 8-3 of the impact simulation.

[0494] Figure 35A This is a stress contour plot of the mica plate as a whole in Experiment Example 9-1 of the impact simulation.

[0495] Figure 35B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 9-1 in the impact simulation.

[0496] Figure 35C This is a contour plot of the overall change in the mica plate in Experiment 9-1 of the impact simulation.

[0497] Figure 36A This is the overall stress contour plot of the mica plate in Experiment 9-2 of the impact simulation.

[0498] Figure 36B It is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 9-2 in the impact simulation.

[0499] Figure 36C This is a contour plot of the overall change in the mica plate in Experiment 9-2 of the impact simulation.

[0500] Figure 37A This is a stress contour plot of the mica plate as a whole in Experiment 9-3 of the impact simulation.

[0501] Figure 37BIt is a stress contour map magnified to show the area of ​​maximum stress in the mica plate of Experiment 9-3 in the impact simulation.

[0502] Figure 37C This is a contour plot of the overall change in the mica plate in Experiment 9-3 of the impact simulation.

[0503] It is believed that when stress is applied to the mica plate, if the maximum stress is about 180 MPa, the mica plate will be damaged.

[0504] Based on the ratio of area S1 to area S2 and its relationship with the maximum stress in experimental examples (Experiments 1-1 to 1-4, 2-1 to 2-3, 3-1 to 3-3, 4-1 to 4-3, and 5-1 to 5-3) with a mica plate thickness of 1 mm, a regression curve was derived. The area S1 / area S2 at the maximum stress of 180 MPa was calculated, resulting in S1 / S2 = 5.8 × 10⁻⁶. -6 Therefore, it is determined that if area S1 is 5.8 × 10⁻⁶ times the area S2 of the mica plate... -6 If the strength is more than twice that of the material, the mica board will be difficult to break.

[0505] Based on the ratio of area S1 to area S2 in experimental examples (Experiments 7-1 to 7-3) with a mica plate thickness of 0.5 mm and its relationship with the maximum stress, a regression curve was derived. The area S1 / area S2 at which the maximum stress reaches 180 MPa was calculated, yielding S1 / S2 = 2.5 × 10⁻⁶. -3 Therefore, it is determined that if the area S1 is 2.5 × 10 of the area S2 of the mica plate... -3 If the strength is more than twice that of the material, the mica board will be difficult to break.

[0506] Based on the ratio of area S1 to area S2 in experimental examples (Experiments 8-1 to 8-3) with a mica plate thickness of 0.3 mm and its relationship with the maximum stress, a regression curve was derived. The area S1 / area S2 with a maximum stress of 180 MPa was calculated, yielding S1 / S2 = 6.0 × 10⁻⁶. -3 Therefore, it is determined that if area S1 is 6.0 × 10 of the area S2 of the mica plate... -3 If the strength is more than twice that of the material, the mica board will be difficult to break.

[0507] Based on the ratio of area S1 to area S2 in experimental examples (Experiments 9-1 to 9-3) with a mica plate thickness of 0.1 mm, and its relationship with the maximum stress, a regression curve is derived. The area S1 / area S2 at the maximum stress of 180 MPa is then calculated, resulting in S1 / S2 = 8.1 × 10⁻⁶. -3 Therefore, it is determined that if area S1 is 8.1 × 10⁻⁶ times the area S2 of the mica plate... -3 If the strength is more than twice that of the material, the mica board will be difficult to break.

[0508] Label Explanation

[0509] 10, 510, 610: Battery pack; 20, 520, 620: Module; 20a, 520a, 620a: Connecting module component; 20b: Busbar; 21, 521, 621: Battery cell; 21a: Terminal; 25, 525, 625: Connecting component; 26a, 26b, 26c: Holes for second fixing component; 30, 530, 630: Housing; 31, 531, 631: Storage part; 32, 532, 632: Cover part; 40, 140, 240, 340, 440, 540, 640, 740: Mica plate; 40a: First side; 40b: Second side; 41, 141, 341: First main surface; 42, 342: Second main surface; 43a, 43a1, 43a2, 43a3, 43a4, 43b, 43c, 543a, 743a: Holes for first fixing components; 60, 70, 80: Fixing components; 61, 71, 81: Head; 62, 72, 82: Main body; 82a: Front end segment; 151, 251: Protrusions; 356, 456: First protrusions; 357, 457: Second protrusions; 520c: Safety valve; 545, 745: Holes for safety valves.

Claims

1. A battery pack, comprising: The module has multiple battery cells; A housing that houses the module; and A mica plate, disposed between the module and the housing, has a first main surface and a second main surface opposite to the first main surface. Its features are, The battery pack also has fixing components for securing the mica plate. The mica plate has a first fixing member hole that extends from the first main surface to the second main surface. The module and / or the housing are provided with a connecting member having a hole for a second fixing component. The fixing component includes a head and a main body connected to the head. The head of the fixing component is located on the first main surface side of the mica plate. The main body of the fixing component passes through the hole in the first fixing component and is inserted into the hole in the second fixing component to fix the mica plate. When the mica plate is viewed from above, the head covers at least a portion of the outline of the hole in the first fixing component and overlaps with the mica plate. The area S1 of the portion where the head overlaps with the mica plate is 5.8 × 10⁻⁶ of the area S2 of the mica plate. -6 More than twice.

2. The battery pack according to claim 1, wherein, The fixing component is selected from at least one shape chosen from the group consisting of rivet-shaped, spring pin-shaped, push pin-shaped, locking pin-shaped and stepped pin-shaped.

3. The battery pack according to claim 1, wherein, The fixing component is rivet-shaped. The second fixing component has a through hole. The main body of the fixing component passes through the first fixing component hole and the second fixing component hole, and a riveting portion is formed at the front end of the main body.

4. The battery pack according to claim 1, wherein, The fixing component is screw-shaped. The second fixing component has a threaded hole. The main body of the fixing component is screwed into the hole of the second fixing component.

5. The battery pack according to any one of claims 1 to 4, wherein, The mica plate is fixed by a plurality of the aforementioned fixing components. When viewed from above, the area S1n of the portion of the head of one of the fixing components that overlaps with the mica plate is greater than the opening area S3 of the hole in the first fixing component.

6. A battery pack comprising: The module has multiple battery cells; A housing that houses the module; and A mica plate, disposed between the module and the housing, has a first main surface and a second main surface opposite to the first main surface. Its features are, The battery pack also has fixing components for securing the mica plate. The mica plate has a first fixing member hole that extends from the first main surface to the second main surface. The module and / or the housing are provided with a connecting member having a hole for a second fixing component. The fixing component is rivet-shaped, comprising a head and a main body connected to the head. The head of the fixing component is located on the first main surface side of the mica plate. The main body of the fixing component passes through the first fixing component hole and the second fixing component hole, and a riveting portion is formed at the front end of the main body. When the mica plate is viewed from above, the shortest distance from the outline of the hole in the first fixing component to the end of the riveting part is more than 0 mm and less than 22 mm.

7. The battery pack according to claim 6, wherein, When the mica plate is viewed from above, the shortest distance from the outline of the hole in the first fixing component to the end of the riveting part is longer than the shortest distance from the outline of the hole in the first fixing component to the end of the head.

8. The battery pack according to claim 6 or 7, wherein, The mica plate is fixed by a plurality of the aforementioned fixing components.

9. The battery pack according to any one of claims 1 to 8, wherein, The mica plate is roughly quadrilateral when viewed from above. When viewed from above, the mica plate has a first side and a second side that is opposite to the first side. A pair of holes for the first fixing member are formed at the end of the first side and the end of the second side of the mica plate.

10. The battery pack according to any one of claims 1 to 9, wherein, An annular washer is disposed between the head and the mica plate. The main body passes through the ring of the washer.

11. The battery pack according to any one of claims 1 to 10, wherein, A protruding strip is provided on the first main surface side of the mica plate, extending along a first direction.

12. The battery pack according to any one of claims 1 to 10, wherein, A first protrusion is formed on the first main surface side of the mica plate.

13. The battery pack according to any one of claims 1 to 12, wherein, The thickness T of the mica plate is 0.1 mm or more and 3.0 mm or less.

14. The battery pack according to any one of claims 1 to 13, wherein, The mica plate has a Young's modulus of less than 110 GPa.

15. The battery pack according to any one of claims 1 to 14, wherein, A safety valve is formed on the surface of the module. The mica plate is located between the surface of the module where the safety valve is formed and the housing. The mica plate has a safety valve hole that exposes the safety valve.

16. The battery pack according to claim 15, wherein, The housing consists of a storage section and a cover section that covers the storage section. The module is housed in the receiving part with the safety valve located on the cover side. The mica plate is disposed between the module and the cover.

17. A structure comprising a mica plate, a substrate, and a fixing member, the mica plate having a first main surface and a second main surface opposite to the first main surface, the mica plate having a first fixing member hole extending from the first main surface to the second main surface, the substrate having a connecting member having a second fixing member hole, the fixing member fixing the mica plate. Its features are, The fixing component includes a head and a main body connected to the head. The head of the fixing component is located on the first main surface side of the mica plate. The main body of the fixing component passes through the hole in the first fixing component and is inserted into the hole in the second fixing component to fix the mica plate. When the mica plate is viewed from above, the head covers at least a portion of the outline of the hole in the first fixing component and overlaps with the mica plate. The area S1 of the portion where the head overlaps with the mica plate is 5.8 × 10⁻⁶ of the area S2 of the mica plate. -6 More than twice.

18. A structure comprising a mica sheet, a substrate, and a fixing member, the mica sheet having a first main surface and a second main surface opposite to the first main surface, the mica sheet having a first fixing member hole extending from the first main surface to the second main surface, the substrate having a connecting member having a second fixing member hole, the fixing member fixing the mica sheet. Its features are, The fixing component is rivet-shaped, comprising a head and a main body connected to the head. The head of the fixing component is located on the first main surface side of the mica plate. The main body of the fixing component passes through the first fixing component hole and the second fixing component hole, and a riveting portion is formed at the front end of the main body. When the mica plate is viewed from above, the shortest distance from the outline of the hole in the first fixing component to the end of the riveting part is greater than 0 mm and less than 22 mm.

19. A method for manufacturing a mica board, characterized in that, The manufacturing method of this mica board includes the following steps: In the molding process, mica prepreg is placed in a mold and hot-pressed to form a mica plate having a first main surface and a second main surface opposite to the first main surface. as well as In the process of forming a hole for a first fixing component, a hole for a first fixing component is formed on the mica plate, extending from the first main surface to the second main surface.

Images