Battery pack and structure

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 further comprises an adhesive member disposed on the surface of the mica plate and fixing the mica plate, and in a plan view of the mica plate, the adhesive member adheres to the first main surface and the second main surface of the mica plate. And the area S1 of the bonding component is more than 5.8 * 10 <-6 > times of the area S2 of the mica plate.

Description

Technical Field

[0001] This invention relates to battery packs and their structures. 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 such thermal runaway, Patent Document 1 discloses a battery pack with a mica plate disposed on the surface of the module.

[0004] Specifically, Patent Document 1 discloses a battery pack comprising battery modules and a mica plate for heat 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 the battery modules 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 for preventing friction loss between the retainer and the mica plate is provided between the mica plate and the retainer, and the wear-resistant material is adhered to the mica plate and completely covers the retainer.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Chinese Utility Model No. 218334011 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] Previously, lightweight battery packs were required to make them easy to handle.

[0010] If a mica plate is configured in the battery pack as in Patent Document 1, it will lead to an increase in the weight of the battery pack.

[0011] As a method to make the battery pack as described in Patent Document 1 lighter, a method of making the mica plate thinner is considered.

[0012] However, in Patent Document 1, rivets are used when fixing the mica plate to the battery module. Under such fixing conditions, if the battery pack is subjected to an impact, the stress generated around the rivet holes becomes higher.

[0013] Therefore, simply thinning the mica sheet will result in a decrease in the strength of the mica sheet and a problem that the area around the rivet holes is prone to damage.

[0014] 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.

[0015] Methods for solving problems

[0016] That is, the battery pack 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 an adhesive component disposed on the surface of the mica plate and fixing the mica plate thereto. When the mica plate is viewed from above, the area S1 of the adhesive component is 5.8 × 10⁻⁶ of the area S2 of the mica plate. -6 More than twice.

[0017] If holes are provided in the mica plate and the mica plate is fixed through these holes using rivets or the like, high stress can easily be applied around the holes when there is an impact.

[0018] However, as described in the present invention, when the mica plate is bonded to the module using an adhesive component, if the area ratio of S1 to S2 is within the specified range, stress can be dispersed and damage to the mica plate can be prevented.

[0019] In the battery pack of the present invention, the adhesive component bonds the module and / or the housing to the mica plate.

[0020] Alternatively, in the battery pack of the present invention, a connecting member may be provided in the module and / or the housing, and the adhesive member may bond the connecting member to the mica plate.

[0021] Thus, in the battery pack of the present invention, the adhesive component can directly fix the module and / or housing to the mica plate, or the module and / or housing can be fixed to the mica plate via the connecting component.

[0022] In the battery pack of the present invention, the mica plate is preferably bonded by a plurality of the adhesive components.

[0023] By bonding the mica sheet to multiple locations, the bonding of the mica sheet is stable.

[0024] In the battery pack of the present invention, preferably, 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 the ends of the mica plate to which the first side belongs and the ends of the mica plate to which the second side belongs are fixed by the adhesive member.

[0025] If the adhesive components are placed in such a position, the mica board will be securely fixed.

[0026] In the battery pack of the present invention, preferably when the mica plate is viewed from above, the area S1n of one of the adhesive components is 5.8 × 10⁻⁶ of the area S2 of the mica plate. -6 More than twice.

[0027] If the ratio of S1n to S2 is within the range described, the stress associated with the mica plate can be mitigated.

[0028] In the battery pack of the present invention, the adhesive component may be a cured adhesive or an insert molding.

[0029] These adhesive components are capable of properly bonding mica panels and modules.

[0030] In the battery pack of the present invention, preferably, a protrusion is provided on the first main surface side of the mica plate, extending along a first direction.

[0031] The natural frequency of a mica sheet is affected by its length, Young's modulus, density, cross-sectional area, and the second moment of its cross-section. For example, increasing the second moment of the cross-section will result in a higher natural frequency.

[0032] If the natural frequency of the mica plate is higher than the vibration of the surrounding environment, resonance will not occur, and the mica plate will hardly generate stress.

[0033] In the battery pack of the present invention, if a specified protrusion is provided on the mica plate, the second moment of cross-section of the mica plate is higher than that of a flat mica plate of the same weight. That is, the second moment of cross-section per unit weight of the mica plate is higher.

[0034] Therefore, even when 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.

[0035] Therefore, even if the mica sheet becomes thinner, it is difficult for the mica sheet to break.

[0036] In the battery pack of the present invention, a first protrusion is preferably formed on the first main surface side of the mica plate.

[0037] Compared to a flat mica sheet of the same weight, this shape of mica sheet has a higher moment of second cross-section. That is, the moment of second cross-section per unit weight of mica sheet is higher.

[0038] Therefore, even when 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.

[0039] Therefore, even if the mica sheet becomes thinner, it is difficult for the mica sheet to break.

[0040] In the battery pack 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.

[0041] 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 the adhesive components are configured in such a way that stress is not concentrated on a part of the mica plate as described.

[0042] Therefore, mica sheets are not easily damaged.

[0043] 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.

[0044] When the thickness T of the mica sheet exceeds 3.0 mm, the mica sheet tends to become heavier.

[0045] In the battery pack of the present invention, the Young's modulus of the mica plate is preferably below 110 GPa.

[0046] If the Young's modulus is below 110 GPa, the mica plate becomes more flexible, and even if stress is generated, the stress is easily dispersed and absorbed.

[0047] Therefore, mica sheets are not easily damaged.

[0048] In the battery pack of the present invention, a safety valve is preferably 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.

[0049] Even if flames or gases are generated from the module due to thermal runaway, they can be released from the safety valve.

[0050] In addition, the mica plate can prevent the spread of flames and gases.

[0051] In the battery pack of the present invention, preferably, the housing is composed of a storage portion and a cover portion covering the storage portion, the module is stored in the storage portion such that the safety valve is located on the side of the cover portion, and the mica plate is disposed between the module and the cover portion.

[0052] Battery packs with this structure are easy to manufacture.

[0053] The structure of the present invention is characterized in that it comprises: an adherend; a mica plate having a first main surface and a second main surface facing the first main surface; and an adhesive member disposed on the surface of the mica plate to fix the mica plate to the adherend, wherein, when the mica plate is viewed from above, the area S1 of the adhesive member is 5.8 × 10⁻⁶ of the area S2 of the mica plate. -6 More than twice.

[0054] If holes are provided in the mica sheet and the mica sheet is fixed to the object to be bonded using rivets or the like through these holes, high stress can easily be applied around the holes when there is an impact.

[0055] However, as described in the present invention, when the mica sheet is bonded to the object using an adhesive component, if the area ratio of area S1 to area S2 is set to the range described above, stress can be dispersed and damage to the mica sheet can be prevented.

[0056] Invention Effects

[0057] 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

[0058] Figure 1A This is a perspective view schematically illustrating an example of a battery pack according to a first embodiment of the present invention.

[0059] Figure 1B yes Figure 1A A sectional view along line AA.

[0060] Figure 1C yes Figure 1A The diagram shown is an exploded view of the battery pack.

[0061] Figure 2A This is a schematic cross-sectional view of an example of an adhesive member and its surroundings in a battery pack according to a first embodiment of the present invention, where the mica plate is directly fixed to the module by an adhesive member.

[0062] Figure 2B Viewed from the first principal side of the mica plate Figure 2A A top view of the bonded component and its surroundings.

[0063] Figure 3 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.

[0064] Figure 4A 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.

[0065] Figure 4B 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.

[0066] Figure 5A 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.

[0067] Figure 5B This is a perspective view schematically illustrating another example of a mica plate or a mica plate with protrusions included in a battery pack according to a first embodiment of the present invention.

[0068] Figure 6A This is a schematic cross-sectional view of an example of an adhesive member and its surroundings when the mica plate is fixed to the module by an adhesive member via a connecting member in a battery pack according to a second embodiment of the present invention.

[0069] Figure 6B Viewed from the first principal side of the mica plate Figure 6A A top view of the bonded component and its surroundings.

[0070] Figure 7A This is a cross-sectional view schematically illustrating an example of a battery pack according to a third embodiment of the present invention.

[0071] Figure 7B This is a perspective view schematically illustrating an example of a mica plate included in a battery pack according to a third embodiment of the present invention.

[0072] Figure 8 This is a cross-sectional view schematically illustrating an example of a battery pack according to a fourth embodiment of the present invention. Detailed Implementation

[0073] The battery pack of the present invention will now be described in detail. However, the present invention is not limited to the following structure, and can be appropriately modified and applied without changing the spirit of the invention. It should be noted that the present invention also includes combinations of two or more of the preferred structures of the present invention described below.

[0074] (First Implementation)

[0075] Figure 1A This is a perspective view schematically illustrating an example of a battery pack according to a first embodiment of the present invention.

[0076] Figure 1B yes Figure 1A A sectional view along line AA.

[0077] Figure 1C yes Figure 1A The diagram shown is an exploded view of the battery pack.

[0078] 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 storing the module 20.

[0079] The housing 30 is composed of a storage section 31 and a cover section 32 that covers the storage section 31, and the module 20 is stored in the storage section 31.

[0080] Additionally, the battery pack 10 has a mica plate 40 disposed between the module 20 and the cover 32.

[0081] The mica plate 40 has a first main surface 41 and a second main surface 42 opposite to the first main surface 41.

[0082] The mica plate 40 is configured such that the first main surface 41 is opposite to the shell 30 and the second main surface 42 is opposite to the module 20.

[0083] 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.

[0084] 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).

[0085] In module 20, multiple battery cells 21 are configured in a row and fixed by connecting module component 20a.

[0086] In addition, the battery cell 21 has a terminal 21a, and adjacent battery cells 21 are electrically connected by a busbar 20b disposed on the connection module component 20a through each terminal 21a.

[0087] Busbar 20b is a flat, conductive metal component. Examples of materials that can be used for busbar 20b include copper, copper alloys, stainless steel (SUS), and aluminum.

[0088] Busbar 20b can also be fixed to terminal 21a by any fixing means (such as thread fastening, welding, etc.).

[0089] In addition, such as Figure 1C As shown, the mica plate 40 is disposed on the connecting module component 20a and is fixed by the adhesive component 90.

[0090] The fixation of the mica plate 40 based on the adhesive component 90 is described in detail.

[0091] Figure 2A This is a schematic cross-sectional view of an example of an adhesive member and its surroundings in a battery pack according to a first embodiment of the present invention, where the mica plate is directly fixed to the module by an adhesive member.

[0092] Figure 2B Viewed from the first principal side of the mica plate Figure 2A A top view of the bonded component and its surroundings.

[0093] like Figure 2A As shown, the mica plate 40 and the module 20 are fixed together by adhesive component 90.

[0094] In addition, such as Figure 2B As shown, when viewed from above, the area S1 of the aforementioned adhesive component is 5.8 × 10⁻⁶ times the area S2 of the aforementioned mica board. -6 More than twice.

[0095] If holes are provided in the mica plate and the mica plate is fixed through these holes using rivets or the like, high stress can easily be applied around the holes when there is an impact.

[0096] However, when the mica plate 40 is bonded to the module 20 using the adhesive component 90, if the area ratio of area S1 to area S2 is set to the above range, stress can be dispersed and damage to the mica plate 40 can be prevented.

[0097] In addition, the breakage resistance of mica plate 40 is also affected by the thickness of mica plate 40.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] The adhesive component 90 can be a cured adhesive or an insert.

[0103] These adhesive components are capable of properly bonding mica panels and modules.

[0104] More specifically, the material of the adhesive component 90 can also be silicone resin, acrylic resin, epoxy resin, polyamide, polyethylene, polypropylene and other hot melt adhesives.

[0105] The thickness of the adhesive component 90 is preferably 0.001 mm to 2 mm, more preferably 0.01 mm to 1 mm, and even more preferably 0.05 mm to 0.5 mm.

[0106] Next, the mica plate 40 will be explained.

[0107] Figure 3 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.

[0108] Figure 3 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 opposite to the first side 40a.

[0109] Adhesive components are provided at the end of the first side 40a and the end of the second side 40b of the mica plate 40. Figure 3 (The part shown by the dashed line in the middle), and fixed to the connecting module component.

[0110] It should be noted that the adhesive components can be disposed at one point or multiple points at the end of the mica plate 40. Furthermore, the adhesive components can be configured as dots or lines.

[0111] Furthermore, the shape of the mica plate 40 is preferably determined appropriately according to the shape of the battery pack.

[0112] 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.

[0113] The lower limit of the thickness T of the mica plate 40 is preferably 0.1 mm or more, more preferably 0.3 mm or more, and even more preferably 0.5 mm or more.

[0114] In addition, the upper limit of the thickness T of the mica plate 40 is preferably 3.0 mm or less, more preferably 2.0 mm or less, and even more preferably 1.0 mm or less.

[0115] 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.

[0116] 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.

[0117] If the thickness T of the mica plate 40 exceeds 3.0 mm, the mica plate 40 becomes heavy and difficult to use.

[0118] The Young's modulus of the mica plate 40 is preferably below 110 GPa, and more preferably 20 GPa to 80 GPa.

[0119] If the Young's modulus is below 110 GPa, the flexibility of the mica plate 40 increases, and even if stress is generated, the stress is easily dispersed and absorbed.

[0120] Therefore, mica board 40 is not easily damaged.

[0121] 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 .

[0122] Alternatively, protrusions or ridges can be formed on the mica plate 40.

[0123] This method is illustrated using accompanying drawings.

[0124] Figure 4A 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.

[0125] exist Figure 4A In the mica plate 140 shown, a plurality of protrusions 151 are formed on the side of the first main surface 141.

[0126] In addition, the protrusion 151 is shaped like a mountain bend.

[0127] If the mica plate 140 has a protrusion 151, the second moment of the cross section of the mica plate 140 can be increased.

[0128] In addition, the protrusion 151 is zigzag-shaped, which enables weight reduction compared to the case of protrusion stacking.

[0129] 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.

[0130] The principle is explained below.

[0131] 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.

[0132] 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.

[0133] For example, the natural frequency ω of an object when its two ends are fixed can be calculated using the following general formula (1).

[0134]

[0135] (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.)

[0136] For example, if the second moment of the cross section is increased, the natural frequency will increase.

[0137] 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.

[0138] 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.

[0139] Figure 4B 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.

[0140] exist Figure 4B The mica plate 240 shown has the same shape as the mica plate 140 described above, except for the stacked protrusions 251.

[0141] Even with this shape, the mica plate 240 is difficult to break because the second moment of the cross section of the mica plate 240 is larger.

[0142] It should be noted that, in the above Figure 4A and Figure 4B 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.

[0143] 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.

[0144] In addition, in the above Figure 4A as well as Figure 4B 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.

[0145] Even with this method, the second moment of the mica sheet's cross-section increases. Therefore, the mica sheet is less prone to breakage.

[0146] Figure 5A 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.

[0147] exist Figure 5A 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.

[0148] The first protrusion 356 is a four-sided pyramid shape, formed by the mica plate 340 being recessed from the second main surface 342 side to the first main surface 341 side.

[0149] 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.

[0150] Furthermore, when viewed from above, the first protrusion 356 and the second protrusion 357 are arranged alternately in a straight line.

[0151] That is, the first protrusion 356 and the second protrusion 357 are formed in a checkered pattern.

[0152] 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.

[0153] 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.

[0154] Figure 5B 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.

[0155] exist Figure 5B 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.

[0156] Even with this shape, the second moment of the cross section of mica plate 440 is high, so mica plate 440 is not easily damaged.

[0157] It should be noted that, in the above Figure 5A and Figure 5BThe 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.

[0158] In addition, in the above Figure 5A and Figure 5B 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.

[0159] Even with this method, the second moment of the mica sheet's cross-section increases. Therefore, the mica sheet is less prone to breakage.

[0160] (Second Implementation)

[0161] Next, the battery pack according to the second embodiment of the present invention will be described.

[0162] The difference between the battery pack of the second embodiment of the present invention and the battery pack of the first embodiment is that the module is provided with a connecting component, and the adhesive component adhesively bonds the connecting component to the mica plate.

[0163] Therefore, the battery pack of the second embodiment will be described with regard to the adhesive component and its surroundings when the mica plate is fixed to the module by the adhesive component via the connecting component.

[0164] Figure 6A This is a schematic cross-sectional view of an example of an adhesive member and its surroundings when the mica plate is fixed to the module by an adhesive member via a connecting member in a battery pack according to a second embodiment of the present invention.

[0165] Figure 6B Viewed from the first principal side of the mica plate Figure 6A A top view of the bonded component and its surroundings.

[0166] like Figure 6A As shown, a connecting component 525 is provided in module 520.

[0167] In addition, the connecting component 525 can be fixed to the module 520 by screws or the like, by adhesive, or by welding.

[0168] In addition, the mica plate 540 and the connecting member 525 are fixed by being bonded together by the adhesive member 590.

[0169] In addition, such as Figure 6BAs shown, when the mica plate 540 is viewed from above, the area S1 of the adhesive component 590 is 5.8 × 10⁻⁶ times the area S2 of the mica plate 540. -6 More than twice.

[0170] If holes are provided in the mica plate and the mica plate is fixed through these holes using rivets or the like, high stress can easily be applied around the holes when there is an impact.

[0171] However, by bonding the mica plate 540 to the module 520 via the bonding member 590 and the connecting member 525, if the area ratio of area S1 to area S2 is within the above range, stress can be dispersed and damage to the mica plate 540 can be prevented.

[0172] In addition, the breakage resistance of mica sheet 540 is also affected by the thickness of mica sheet 540.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] The material of the connecting component 525 is not particularly limited; it can be aluminum, stainless steel, copper, or a cured resin.

[0178] The description up to this point has described the method of fixing the mica plate 540 to the module 520, but in the battery pack of the present invention, the mica plate may also be fixed to the housing side.

[0179] Apart from the above-described configuration, in the battery pack of the second embodiment of the present invention, the preferred structure of the mica plate 540 is the same as the preferred structure of the mica plate 40 in the battery pack 10 of the first embodiment of the present invention.

[0180] (Third Implementation)

[0181] Next, the battery pack according to the third embodiment of the present invention will be described.

[0182] The battery pack of the third 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.

[0183] The accompanying diagram illustrates this type of battery pack.

[0184] Figure 7A This is a cross-sectional view schematically illustrating an example of a battery pack according to a third embodiment of the present invention.

[0185] Figure 7B This is a perspective view schematically illustrating an example of a mica plate included in a battery pack according to a third embodiment of the present invention.

[0186] Figure 7A The battery pack 610 shown has: a module 620 having multiple battery cells 621, and a housing 630 for storing the module 620.

[0187] 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.

[0188] Additionally, the battery pack 610 has a mica plate 640 disposed between the module 620 and the cover 632.

[0189] In module 620, multiple battery cells 621 are fixed by connecting module component 620a.

[0190] In the battery pack 610, a safety valve 620c is formed on the connecting module component 620a, which becomes module 620.

[0191] In addition, such as Figure 7A as well as Figure 7B As shown, a safety valve hole 645 is formed in the mica plate 640 to expose the safety valve 620c.

[0192] Even if flames or gases are generated from the module due to thermal runaway, they can be released from the safety valve.

[0193] In addition, the mica plate can prevent the spread of flames and gases.

[0194] In the battery pack 610, the mica plate 640 is bonded to the connecting module component 620a by an adhesive component (not shown).

[0195] When viewed from above, the area S1 of the bonded component is 5.8 × 10⁻⁶ times the area S2 of the mica plate. -6 More than twice.

[0196] If holes are provided in the mica plate and the mica plate is fixed through these holes using rivets or the like, high stress can easily be applied around the holes when there is an impact.

[0197] However, by using adhesive components to bond the mica plate 640 to the module 620, if the area ratio of area S1 to area S2 is set to the above range, stress can be dispersed and damage to the mica plate 640 can be prevented.

[0198] Furthermore, when calculating the area S2 of the mica plate 640, the safety valve uses the hole 645 as the buried part to calculate the area S2.

[0199] In addition, the breakage resistance of mica plate 640 is also affected by the thickness of mica plate 40.

[0200] 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.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] Alternatively, in the battery pack 610, a connecting component can also be provided in the module 620, and an adhesive component can be used to bond the connecting component to the mica plate 640.

[0205] The preferred materials and shapes of the battery cell 621, housing 630, mica plate 640, and adhesive components in the battery pack 610 are the same as those of the preferred materials and shapes of the battery cell 21, housing 30, mica plate 40, and adhesive components in the battery pack 10 of the first embodiment of the present invention.

[0206] (Fourth Implementation)

[0207] Next, the battery pack according to the fourth embodiment of the present invention will be described.

[0208] The battery pack in the fourth embodiment of the present invention may also be configured such that the mica plate covers the entire circumference of the module.

[0209] The accompanying diagram illustrates this type of battery pack.

[0210] Figure 8 This is a cross-sectional view schematically illustrating an example of a battery pack according to a fourth embodiment of the present invention.

[0211] Figure 8 The battery pack 710 shown has: a module 720 having multiple battery cells 721, and a housing 730 for storing the module 720.

[0212] The housing 730 consists of a storage section 731 and a cover 732 that covers the storage section 731, and the module 720 is stored in the storage section 731.

[0213] In module 720, multiple battery cells 721 are fixed by connecting module component 720a.

[0214] In the battery pack 710, the mica plate 740 is bonded to the connection module component 720a by an adhesive component (not shown).

[0215] When viewed from above, the area S1 of the bonded component is 5.8 × 10⁻⁶ times the area S2 of the mica plate. -6 More than twice.

[0216] If holes are provided in the mica plate and the mica plate is fixed through these holes using rivets or the like, high stress can easily be applied around the holes when there is an impact.

[0217] However, when the mica plate 740 is bonded to the module 720 using adhesive components, if the area ratio of area S1 to area S2 is set to the above range, stress can be dispersed and damage to the mica plate 740 can be prevented.

[0218] In addition, the breakage resistance of mica sheet 740 is also affected by the thickness of mica sheet 740.

[0219] For example, when the thickness of the mica plate 740 is 1.0 mm or more, the area S1 is preferably 1.4 × 10⁻⁶ times the area S2. -3 More than twice.

[0220] Furthermore, when the thickness of the mica plate 740 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.

[0221] Furthermore, when the thickness of the mica plate 740 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.

[0222] Furthermore, when the thickness of the mica plate 740 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.

[0223] Alternatively, in the battery pack 710, a connecting component can also be provided in the module 720, and an adhesive component can be used to bond the connecting component to the mica plate 740.

[0224] In the battery pack 710, the entire periphery of the module 720 is covered by the mica plate 740.

[0225] If the mica plate 740 covers the entire circumference of the module 720, then regardless of the location where the flame or gas is generated, the mica plate 740 can prevent the flame or gas from spreading.

[0226] As a method of covering the entire circumference of module 720 with mica plate 740, one example is to form mica plate 740 into multiple parts and arrange each part around module 720.

[0227] The preferred materials and shapes of the battery cell 721, housing 730, mica plate 740, and adhesive components in the battery pack 710 are the same as those of the preferred materials and shapes of the battery cell 21, housing 30, mica plate 40, and adhesive components in the battery pack 10 of the first embodiment of the present invention.

[0228] (Other implementation methods)

[0229] In the battery packs described in the first to fourth embodiments, the casing is composed of a storage part and a cover part. However, in the battery pack of the present invention, as long as it can accommodate the module, the shape of the casing 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.

[0230] In the battery pack described in the first embodiment, the mica plate is bonded to the module by an adhesive component. However, in the battery pack of the present invention, the mica plate can also be fixed to the housing by an adhesive component.

[0231] In the battery pack described in the second embodiment, a connecting component is provided in the module; however, in the battery pack of the present invention, a connecting component may also be provided in the housing.

[0232] In this case, the mica sheet is bonded to the housing via connecting components.

[0233] 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.

[0234] The following matters are described in this instruction manual.

[0235] 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 an adhesive component disposed on the surface of the mica plate and fixing the mica plate thereto, wherein, when the mica plate is viewed from above, the area S1 of the adhesive component is 5.8 × 10⁻⁶ of the area S2 of the mica plate. -6 More than twice.

[0236] The present invention (2) is the battery pack described in the present invention (1), wherein the adhesive component adhesively bonds the module and / or the housing to the mica plate.

[0237] The present invention (3) is the battery pack described in the present invention (1), wherein a connecting component is provided in the module and / or the housing, and the adhesive component adhesively bonds the connecting component to the mica plate.

[0238] The present invention (4) is a battery pack according to any one of the present invention (1) to (3), wherein the mica plate is bonded by a plurality of the adhesive components.

[0239] The present invention (5) is a battery pack according to any one of the present inventions (1) to (4), 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 the end of the mica plate to which the first side belongs and the end of the mica plate to which the second side belongs are fixed by the adhesive member.

[0240] The present invention (6) is a battery pack according to any one of the present inventions (1) to (5), wherein, when the mica plate is viewed from above, the area S1n of one of the adhesive components is 5.8 × 10⁻⁶ of the area S2 of the mica plate. -6 More than twice.

[0241] The present invention (7) is a battery pack according to any one of the present invention (1) to (6), wherein the adhesive component is a cured product of the adhesive.

[0242] The present invention (8) is a battery pack according to any one of the present inventions (1) to (6), wherein the adhesive component is an insert molding.

[0243] The present invention (9) is a battery pack according to any one of the present inventions (1) to (8), wherein a protrusion is provided on the first main surface side of the mica plate extending in a first direction.

[0244] The present invention (10) is a battery pack according to any one of the present inventions (1) to (8), wherein a first protrusion is formed on the first main surface side of the mica plate.

[0245] The present invention (11) is a battery pack according to any one of the present invention (1) to (10), wherein the thickness T of the mica plate is 0.1 mm or more and 3.0 mm or less.

[0246] The present invention (12) is a battery pack according to any one of the present inventions (1) to (11), wherein the Young's modulus of the mica plate is less than 110 GPa.

[0247] The present invention (13) is a battery pack according to any one of the present inventions (1) to (12), 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.

[0248] The present invention (14) is the battery pack described in the present invention (13), 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.

[0249] The present invention (15) is a structure characterized in that the structure comprises: an adherend; a mica plate having a first main surface and a second main surface facing the first main surface; and an adhesive component disposed on the surface of the mica plate to fix the mica plate to the adherend, wherein, when the mica plate is viewed from above, the area S1 of the adhesive component is 5.8 × 10⁻⁶ of the area S2 of the mica plate. -6 More than twice.

[0250] Label Explanation

[0251] 10, 610, 710: Battery pack; 20, 520, 620, 720: Module; 20a, 620a, 720a: Connecting module component; 20b: Busbar; 21, 621, 721: Battery cell; 21a: Terminal; 30, 630, 730: Housing; 31, 631, 731: Storage section; 32, 632, 732: Cover; 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; 90, 590: Adhesive parts; 151, 251: Protrusions; 356, 456: First protrusions; 357, 457: Second protrusions; 525: Connecting parts; 620c: Safety valve; 645: Safety valve orifice.

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 adhesive components disposed on the surface of the mica plate and fixing the mica plate. When viewed from above, the area S1 of the adhesive component is 5.8 × 10⁻⁶ times the area S2 of the mica board. -6 More than twice.

2. The battery pack according to claim 1, wherein, The adhesive component bonds the module and / or the housing to the mica plate.

3. The battery pack according to claim 1, wherein, Connecting components are provided in the module and / or the housing. The adhesive component bonds the connecting component to the mica plate.

4. The battery pack according to any one of claims 1 to 3, wherein, The mica board is bonded together by a plurality of the adhesive components.

5. The battery pack according to any one of claims 1 to 4, 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. The ends of the mica sheet belonging to the first side and the ends of the mica sheet belonging to the second side are fixed by the adhesive component.

6. The battery pack according to any one of claims 1 to 5, wherein, When viewed from above, the area S1n of one of the adhesive components is 5.8 × 10⁻⁶ of the area S2 of the mica plate. -6 More than twice.

7. The battery pack according to any one of claims 1 to 6, wherein, The adhesive component is a cured product of the adhesive.

8. The battery pack according to any one of claims 1 to 6, wherein, The adhesive component is an insert molding.

9. The battery pack according to any one of claims 1 to 8, wherein, A protruding strip is provided on the first main surface side of the mica plate, extending along a first direction.

10. The battery pack according to any one of claims 1 to 8, wherein, A first protrusion is formed on the first main surface side of the mica plate.

11. The battery pack according to any one of claims 1 to 10, wherein, The thickness T of the mica plate is 0.1 mm or more and 3.0 mm or less.

12. The battery pack according to any one of claims 1 to 11, wherein, The mica plate has a Young's modulus of less than 110 GPa.

13. The battery pack according to any one of claims 1 to 12, 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.

14. The battery pack according to claim 13, 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.

15. A structure characterized in that, The structure contains: The object to be adhered to; A mica sheet having a first main surface and a second main surface opposite to the first main surface; and An adhesive component, disposed on the surface of the mica sheet, secures the mica sheet to the object to be bonded. When viewed from above, the area S1 of the adhesive component is 5.8 × 10⁻⁶ times the area S2 of the mica board. -6 More than twice.

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