Mica plate, battery and vehicle

Abstract

The utility model discloses a mica plate, a battery and a vehicle, and belongs to the technical field of batteries. The mica plate is used for being arranged at one end, provided with an anti-explosion valve, of a battery cell group, a plurality of thinning areas are arranged on the mica plate, the thinning areas are suitable for being in one-to-one correspondence with the anti-explosion valves of a plurality of battery cells of the battery cell group, a weak area is arranged between every two adjacent thinning areas, and the weak areas are of an easy-to-break structure. The mica plates can play a role in protecting the battery cells, the mica plates can be more easily broken through to exhaust air outwards when the explosion-proof valve is erupted by arranging the thinning areas corresponding to the explosion-proof valve, and the weak areas can be quickly broken when a single battery cell is in thermal runaway by arranging the weak areas, so that the explosion-proof valve is prevented from being damaged. Erupted high-temperature flue gas is prevented from diffusing to other battery cells along one side, facing the battery cell group, of the mica plate, so that the probability of thermal runaway diffusion is reduced, and the safety performance of the battery is improved in an auxiliary manner.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a mica plate, a battery, and a vehicle. Background Art

[0002] In general batteries, a mica cover plate is provided above the battery cells. The mica cover plate has the functions of heat insulation and insulation. When a single battery cell has a thermal runaway, it can protect other battery cells from being easily affected. When a battery cell has a thermal runaway, the mica cover plate at the corresponding position is generally broken through. When breaking through, it may cause uncontrollable fracture or elevation of the mica plate, forming a new exhaust gap, thus easily affecting other battery cells. Utility Model Content

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this reason, this application provides a mica plate, a battery, and a vehicle, which can realize rapid heat dissipation and load unloading of the battery cells, and the thermal protection of the battery cells during thermal runaway is relatively independent and not easily affect adjacent battery cells, and can assist in improving the safety performance of the battery.

[0004] In a first aspect, this application provides a mica plate, which is used to be arranged at one end of a battery cell group provided with an explosion-proof valve. A plurality of thinning areas are provided on the mica plate, and the plurality of thinning areas are adapted to correspond to the explosion-proof valves of the plurality of battery cells of the battery cell group one by one. A weak area is provided between two adjacent thinning areas, and the weak area is an easily fractured structure.

[0005] According to the mica plate of this application, by providing thinning areas corresponding to the explosion-proof valves, it is easier to break through the mica plate and exhaust outward when the explosion-proof valve erupts. By providing a weak area, when a single battery cell has a thermal runaway, the weak area can quickly break, avoiding the high-temperature flue gas ejected from spreading to other battery cells along one side of the mica plate towards the battery cell group, reducing the probability of thermal runaway diffusion, and assisting in improving the safety performance of the battery.

[0006] According to an embodiment of this application, the plurality of thinning areas are arranged in sequence on the mica plate along a first direction, and the weak area extends along a second direction, and the second direction forms an angle with the first direction, so that the weak area separates two adjacent thinning areas.

[0007] According to an embodiment of this application, the weak area is provided with a through groove penetrating along the thickness direction of the mica plate, and the through groove extends along the second direction.

[0008] According to an embodiment of this application, the width L1 of the through groove in the first direction satisfies:

[0009] 2mm ≤ L1 ≤ 5mm.

[0010] According to an embodiment of this application, the distance L2 between the through groove and the thinning area satisfies:

[0011] 3mm ≤ L2 ≤ 6mm.

[0012] According to an embodiment of the present application, at least one end of the through groove in the second direction is spaced from the edge of the mica plate.

[0013] According to an embodiment of the present application, the distance L3 between the end of the through groove in the second direction and the edge of the mica plate satisfies:

[0014] 8mm ≤ L3 ≤ 20mm.

[0015] According to an embodiment of the present application, the thinning area is provided with a sinking groove, and the thickness M1 of the bottom wall of the sinking groove satisfies:

[0016] 0.1mm ≤ M1 ≤ 0.3mm; and / or,

[0017] The thickness M2 of the area of the mica plate other than the thinning area satisfies:

[0018] 0.5mm ≤ M2 ≤ 1mm.

[0019] In a second aspect, the present application provides a battery, which includes:

[0020] A battery cell group, including a plurality of battery cells, and the battery cells are provided with explosion-proof valves;

[0021] The mica plate according to any one of the technical solutions in the first aspect is covered on the surface of the plurality of battery cells where the explosion-proof valves are provided.

[0022] The battery provided in the second aspect of the present application has the same beneficial effects as the mica plate in the first aspect, and will not be described herein again.

[0023] In a third aspect, the present application provides a vehicle, including the battery according to the second aspect, and the battery is used to provide electrical energy for the vehicle.

[0024] The vehicle provided in the third aspect of the present application has the same beneficial effects as the battery in the second aspect, and will not be described herein again.

[0025] The additional aspects and advantages of the present application will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0027] Figure 1 is one of the schematic diagrams of the installation structure of the mica cover plate in the related art;

[0028] Figure 2 is the second schematic diagram of the installation structure of the mica cover plate in the related art;

[0029] Figure 3 It is the third schematic diagram of the installation structure of the mica cover plate in the related art;

[0030] Figure 4 It is one of the schematic diagrams of the structure of the mica plate provided by the embodiment of the present application;

[0031] Figure 5 It is the second schematic diagram of the structure of the mica plate provided by the embodiment of the present application;

[0032] Figure 6 It is the partial structure schematic diagram of the mica plate provided by the embodiment of the present application;

[0033] Figure 7 It is the schematic diagram of the structure of the battery provided by the embodiment of the present application;

[0034] Figure 8 It is the explosion structure schematic diagram of the battery provided by the embodiment of the present application.

[0035] Reference numerals:

[0036] 1. Battery; 11. Battery cell group; 111. Battery cell; 1111. Explosion-proof valve; 12. Mica plate; 121. Thinning area; 1211. Sinking groove; 122. Weak area; 1221. Through groove; 123. Avoidance hole. Detailed implementation manners

[0037] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0038] In the related art, generally, the mica cover plate is arranged directly below the upper cover of the battery pack (as shown in Figure 1 ) or directly above the cell terminal cover plate (as shown in Figure 2 ).

[0039] When the mica cover plate is located directly below the upper cover, there is a large gap between the top of the battery cell and the mica cover plate. After thermal runaway of the battery cell inside the module, the high-temperature and high-heat ejecta of the battery cell will diffuse to the top of the adjacent battery cell through the top gap, and the continuous accumulation of the ejecta will break through the adjacent battery cell from the top, triggering thermal runaway of the adjacent battery cell and then leading to thermal runaway of the whole pack.

[0040] When the mica cover plate is located directly above the cell terminal cover plate, after the explosion-proof valve is triggered to open due to thermal runaway of the battery cell, the opening of the explosion-proof valve will impact and damage the mica cover plate above it. Since the mica cover plate is hard and brittle, it will break (as shown in Figure 3As shown in the figure, the mica cover is partially lifted up, forming a similar exhaust gap. Thermal runaway of the battery cell will also accumulate in the gap, break through the adjacent battery cell from the top, and cause the whole package to thermally run away.

[0041] Based on the above considerations, the present application proposes a mica board, a battery and a vehicle. The mica board is used to be arranged at one end of the battery cell group where an explosion-proof valve is provided, so as to realize rapid heat dissipation and load release of the battery cell, and the thermal runaway thermal protection of the battery cell is relatively independent, which is not easy to affect adjacent battery cells, and can help improve the safety performance of the battery.

[0042] Reference below Figures 4 - 8 A mica board according to an embodiment of the present application is described.

[0043] See also Figure 4 , Figure 7 and Figure 8 The mica plate 12 of the embodiment of the present application is used to be arranged at one end of the battery cell group 11 where the explosion-proof valve 1111 is provided. A plurality of thinning areas 121 are provided on the mica plate 12. The plurality of thinning areas 121 are suitable for one-to-one correspondence with the explosion-proof valves 1111 of the plurality of battery cells of the battery cell group 11. A weak area 122 is provided between two adjacent thinning areas 121, and the weak area 122 is an easily breakable structure.

[0044] When the mica board 12 is installed on the battery cell group 11, the thinned area 121 on the mica board 12 can correspond to the explosion-proof valves 1111 of multiple battery cells one by one. It can be understood that the thickness of the mica board 12 in the thinned area 121 is thinner than the thickness of the mica board 12 body, so that the structural strength of the thinned area 121 is relatively weaker. When the battery cell thermal runaway and triggers the explosion-proof valve 1111 to open, the thinned area 121 can respond first, reducing the impact on the overall structure of the mica board 12, and facilitating the battery cell to quickly exhaust to the top of the mica board 12. In addition, the local thinning setting method has little damage to the overall structure of the mica board 12, the overall structural strength is higher, and other battery cells that have not experienced thermal runaway can be more effectively protected.

[0045] Among them, when the explosion-proof valve 1111 erupts, a large impact force will be applied to the thinning area 121 of the mica board 12. If the thinning area 121 is not broken in the first time, the mica board 12 in the corresponding area will be pushed to tilt upward. By setting a weak area 122 between two adjacent thinning areas 121, and the weak area 122 is an easy-to-break structure, the weak area 122 can be broken first under the impact force generated by the opening of the explosion-proof valve 1111, thereby guiding the mica board 12 to be lifted locally in an orderly manner when the thinning area 121 is not broken in the first time, forming a controllable exhaust path, and avoiding large-scale damage caused by disordered fracture. And reduce the probability of the adjacent thinning area 121 being driven to tilt, ensure the stability of the mica board 12 to protect other cells that have not experienced thermal runaway, and reduce the probability of thermal runaway spreading.

[0046] Among them, the thinning area 121 is directly opposite to the explosion-proof valve 1111 of the battery cell, and the weak area 122 can be adapted to correspond to the gap between two adjacent battery cells, so that even if the mica plate 12 breaks at the weak area 122, the impact on adjacent battery cells is relatively small.

[0047] In actual implementation, when a battery cell undergoes thermal runaway, the explosion-proof valve 1111 of the battery cell opens and ejects high-temperature and high-pressure flue gas outward. The high-temperature and high-pressure flue gas can directly break through the corresponding thinning area 121, discharge the flue gas to the side of the mica plate 12 away from the battery cell, and discharge it along the smoke exhaust channel. The mica plate 12 can effectively protect other battery cells. When the thinning area 121 does not break through immediately, the flue gas will push the mica plate 12 in the area corresponding to the battery cell to warp. It should be noted here that the mica plate 12 and the battery cell group 11 are generally connected by bonding. Therefore, there is a certain adhesive force between the mica plate 12 and the battery cell. When the mica plate 12 corresponding to the battery cell breaks through the adhesive force and warps upward, the mica plate 12 corresponding to the adjacent battery cell remains fixed under the action of the adhesive force, so that the weak area 122 between the battery cell and the adjacent battery cell instantaneously bears a certain torque and breaks, thereby decomposing the mica plate 12. The mica plate 12 corresponding to the battery cell flies out under the impact of the flue gas, and the flue gas is discharged smoothly. The mica plate 12 corresponding to the adjacent battery cell remains adhesively fixed on the battery cell, maintaining a protective state for the adjacent battery cell, thereby preventing the flue gas from diffusing above other battery cells, greatly reducing the probability of thermal runaway diffusion, and improving the overall safety.

[0048] According to the mica plate 12 of the embodiment of the present application, by providing the thinning area 121 corresponding to the explosion-proof valve 1111, it is easier to break through the mica plate 12 and exhaust outward when the explosion-proof valve 1111 ejects. By providing the weak area 122, when a single battery cell undergoes thermal runaway, the weak area 122 can break quickly, preventing the ejected high-temperature flue gas from diffusing along the side of the mica plate 12 facing the battery cell group 11 to other battery cells, reducing the probability of thermal runaway diffusion, and assisting in improving the safety performance of the battery 1.

[0049] Please refer to Figure 4 According to some embodiments of the present application, a plurality of thinning areas 121 can be arranged in sequence on the mica plate 12 along a first direction, and the weak area 122 extends along a second direction. The second direction forms an angle with the first direction, so that the weak area 122 separates two adjacent thinning areas 121.

[0050] It can be understood that a plurality of battery cells in the battery cell group 11 are generally arranged in sequence along one direction. By arranging the thinning areas 121 in sequence along the first direction (assumed to be the arrangement direction of the battery cell group 11), it is ensured that each thinning area 121 can directly correspond to the position of the explosion-proof valve 1111 of each battery cell in the battery cell group 11, improving the accuracy and efficiency of the response.

[0051] The extending direction (the second direction) of the weak area 122 forms a certain angle with the arranging direction (the first direction) of the thinning area 121. This design can ensure that when the explosion-proof valve 1111 is opened, the weak area 122 can preferentially break along the second direction, guiding the orderly lifting of the local mica plate 12 and the formation of the exhaust path, and avoiding the overall structural damage of the mica plate 12 that may be caused by disordered fracture.

[0052] In some embodiments, a series of micro-cracks or pre-set fracture lines can be arranged in the weak area 122, so that under the impact force generated when the explosion-proof valve 1111 is opened, the weak area 122 can break preferentially.

[0053] Please refer to Figure 4 and Figure 5 , according to some embodiments of the present application, the weak area 122 can be provided with a through groove 1221 that penetrates along the thickness direction of the mica plate 12, and the through groove 1221 extends along the second direction.

[0054] The through groove 1221 is designed to penetrate along the thickness direction of the mica plate 12, thereby effectively weakening the structural strength of the weak area 122, ensuring that when the explosion-proof valve 1111 is opened, the impact force can be quickly transmitted to the entire weak area 122, promoting the orderly fracture of the weak area 122, forming an effective exhaust path, and reducing the direct impact on the mica plate 12 corresponding to the adjacent battery cells.

[0055] Among them, the cross-sectional shape of the through groove 1221 in the thickness direction of the mica plate 12 is not limited herein. Different cross-sectional shapes will affect the shape and degree of tearing, and can be determined according to design requirements. In one example, as Figure 4 and Figure 5 shown, the cross-sectional shape of the through groove 1221 is rectangular; in other examples, the cross-sectional shape of the through groove 1221 can also be oval, fusiform, rhombic, etc.

[0056] Please refer to Figure 6 , according to some embodiments of the present application, the width L1 of the through groove 1221 in the first direction can satisfy:

[0057] 2mm ≤ L1 ≤ 5mm.

[0058] By limiting the width of the through groove 1221 in the first direction, it is avoided that the width of the through groove 1221 is too small to effectively cause fracture, and it is avoided that the width of the through groove 1221 is too large to affect the overall structural stability of the mica plate 12 and affect the protection of the battery cells by the mica plate 12. It can be understood that the through groove 1221 corresponds to the gap between two adjacent battery cells.

[0059] It should be noted that when there are multiple through slots 1221, the widths of the respective through slots 1221 in the first direction may be the same or different, and there is no specific limitation. It is designed according to actual requirements, such as the arrangement spacing of the battery cells, etc.

[0060] Among them, the value range of the width L1 of the through slot 1221 in the first direction is [2 mm, 5 mm]. Exemplarily, L1 can take values such as 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, or other values between 2 mm and 5 mm. There is no specific limitation here.

[0061] Please refer to Figure 6 , according to some embodiments of the present application, the distance L2 between the through slot 1221 and the thinning area 121 can satisfy:

[0062] 3 mm ≤ L2 ≤ 6 mm.

[0063] By limiting the distance L2 between the through slot 1221 and the thinning area 121, if the distance L2 is too small, it may affect the independent response of the thinning area 121 adjacent to the through slot 1221, and if the distance is too large, it will weaken the guiding effect of the through slot 1221 on the fracture path. Thus, when the battery cell is in thermal runaway, when the thinning area 121 is instantly broken through, the weak area 122 may not be torn, and when the thinning area 121 is not broken through, the mica plate 12 can be fractured orderly along the preset path to form an effective exhaust path.

[0064] It should be noted that the distance between every two adjacent through slots 1221 and thinning areas 121 may be the same or different, and it is designed according to actual requirements, such as the actual arrangement of the battery cells, etc.

[0065] Among them, the value range of the distance L2 between the through slot 1221 and the thinning area 121 is [3 mm, 6 mm]. Exemplarily, L2 can take values such as 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, or other values between 3 mm and 6 mm. There is no specific limitation here.

[0066] Please refer to Figure 6 , according to some embodiments of the present application, at least one end of the through slot 1221 in the second direction is spaced from the edge of the mica plate 12.

[0067] By setting the through slot 1221 to be spaced from the edge of the mica plate 12, the integrity of the mica plate 12 is ensured, and when assembling the mica plate 12, the whole mica plate 12 can be directly covered on the battery cell group 11, greatly improving the assembly efficiency.

[0068] Moreover, the part where the end of the through groove 1221 is spaced from the edge of the mica plate 12 in the second direction forms a weak structure of the weak area 122. Because the width is relatively narrow, the structural strength is weak, and it can be quickly torn when needed.

[0069] In one example, as Figure 4 、 Figure 5 and Figure 6 shown, both ends of the through groove 1221 in the second direction are spaced from the edge of the mica plate 12; in another example, one end of the through groove 1221 in the second direction can be spaced from the edge of the mica plate 12, and the other end penetrates through the mica plate 12.

[0070] Please refer to Figure 6 , according to some embodiments of the present application, the distance L3 between the end of the through groove 1221 in the second direction and the edge of the mica plate 12 can satisfy:

[0071] 8mm ≤ L3 ≤ 20mm.

[0072] By limiting the range of the distance L3, it is possible to avoid that too small a distance may weaken the structural strength of the edge area, thereby avoiding direct damage to the edge area when the battery cell does not have a thermal runaway, and improving the stability of the edge area structure. And it is possible to avoid that too large a distance may weaken the guiding effect of the through groove 1221 on the fracture path, resulting in failure to break quickly during thermal runaway.

[0073] Among them, the value range of the distance L3 between the end of the through groove 1221 in the second direction and the edge of the mica plate 12 is [8mm, 20mm]. Exemplarily, L3 can take values of 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm or other values between 8mm - 20mm, and no specific limitation is made here.

[0074] Please refer to Figure 4 and Figure 5 , according to some embodiments of the present application, the thinning area 121 is provided with a sinking groove 1211, and the bottom wall thickness M1 of the sinking groove 1211 can satisfy:

[0075] 0.1mm ≤ M1 ≤ 0.3mm.

[0076] By providing a sunk groove 1211 in the thinning area 121 of the mica plate 12 to reduce the thickness of the corresponding area, thereby reducing the structural strength of the thinning area 121, so that when the explosion-proof valve 1111 erupts, it can quickly break through the bottom wall of the sunk groove 1211. By defining the thickness of the bottom wall of the sunk groove 1211, it is possible to avoid the bottom wall of the sunk groove 1211 being too thick, which makes it difficult to break through when the explosion-proof valve 1111 erupts, and improve the exhaust performance; and avoid the bottom wall of the sunk groove 1211 being too thin, which affects the overall structural strength, and when other sunk grooves 1211 are broken through for exhaust, the undamaged sunk grooves 1211 can effectively protect the corresponding battery cells. And the processing is simple and the production cost is low.

[0077] It should be noted that the thickness of the bottom wall of each sunk groove 1211 can be the same or different, and no specific limitation is made here.

[0078] It should be noted that the projected shape of the sunk groove 1211 on the mica plate 12 is not specifically limited here, and it can be circular, square, rectangular, oval, etc., and can also be set according to the shape of the explosion-proof valve 1111.

[0079] Among them, the value range of the thickness M1 of the bottom wall of the sunk groove 1211 is [0.1 mm, 0.3 mm]. Exemplarily, M1 can take values of 0.1 mm, 0.13 mm, 0.15 mm, 0.17 mm, 0.2 mm, 0.23 mm, 0.25 mm, 0.28 mm, 0.3 mm or other values between 0.1 mm and 0.3 mm, and no specific limitation is made here.

[0080] Furthermore, the sunk groove 1211 can be provided on the side of the mica plate 12 facing the battery cell, or can be provided on the side of the mica plate 12 facing away from the battery cell.

[0081] According to some embodiments of the present application, the thickness M2 of the area of the mica plate 12 other than the thinning area 121 can satisfy:

[0082] 0.5 mm ≤ M2 ≤ 1 mm.

[0083] By defining the range of M2, the thickness of the non-thinning area 121 of the mica plate 12 can ensure the stability and strength of the overall structure of the mica plate 12 when the battery cell is out of control, avoid structural damage caused by insufficient thickness, and at the same time reduce the direct impact on adjacent battery cells.

[0084] Among them, the value range of the thickness M2 of the area of the mica plate 12 other than the thinning area 121 is [0.5 mm, 1 mm]. Exemplarily, M2 can take values of 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, or other values between 0.5 mm and 1 mm, and no specific limitation is made here.

[0085] Please refer to Figure 4 and Figure 5 In some embodiments, an avoidance hole 123 may be provided on the mica plate 12, and the avoidance hole 123 can be used for the temperature sampling pin to pass through. It can be understood that the projection of the avoidance hole 123 on the mica plate 12 is arranged in a dislocation manner with respect to the thinning area 121 and the weak area 122 to avoid the influence of the avoidance hole 123 on the thinning area 121 and the weak area 122.

[0086] Please refer to Figure 7 and Figure 8 An embodiment of the present application also provides a battery 1.

[0087] The battery 1 includes a battery cell group 11 and a mica plate 12 as described in any of the above technical solutions. The battery cell group 11 includes a plurality of battery cells, and the battery cells are provided with explosion-proof valves 1111; the mica plate 12 covers the surfaces of the plurality of battery cells provided with explosion-proof valves 1111.

[0088] The mica plate 12 can be adhesively fixed to the plurality of battery cells, and the plurality of thinning areas 121 on the mica plate 12 correspond to the explosion-proof valves 1111 of the plurality of battery cells one by one, and the weak areas 122 on the mica plate 12 correspond to the gaps between adjacent two battery cells.

[0089] It can be understood that since the battery 1 of the present application includes the mica plate 12 as described in any of the above technical solutions, it has the technical features and beneficial effects of the mica plate 12 as described in any of the above technical solutions, which will not be elaborated here.

[0090] In some embodiments, the battery 1 may include a plurality of battery cell groups 11, and a plurality of mica plates 12 may be provided corresponding to the plurality of battery cell groups 11.

[0091] An embodiment of the present application also provides a vehicle, including the battery 1 as described in the above technical solution, and the battery 1 is used to provide electrical energy for the vehicle.

[0092] It can be understood that since the vehicle of the embodiment of the present application includes the battery as described in the above technical solution, it has the technical features and beneficial effects of the battery as described in the above technical solution, which will not be elaborated here.

[0093] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type and do not limit the number of objects. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0094] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0095] In the description of the present application, the "first feature" and "second feature" may include one or more of such features.

[0096] In the description of the present application, the meaning of "a plurality" is two or more.

[0097] In the description of the present application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0098] In the description of the present application, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0099] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0100] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A mica plate is used for being arranged at one end of a battery cell group where an explosion-proof valve is provided, and is characterized in that, A plurality of thinning regions are provided on the mica plate, and the plurality of thinning regions are adapted to correspond one by one to the explosion-proof valves of the plurality of battery cells of the battery cell group. A weak region is provided between two adjacent thinning regions, and the weak region is a structure prone to fracture.

2. The mica plate according to claim 1, wherein, The plurality of thinning regions are arranged in sequence on the mica plate along a first direction, and the weak region extends along a second direction. The second direction forms an angle with the first direction so that the weak region separates two adjacent thinning regions.

3. The mica plate according to claim 2, wherein A through groove penetrating along the thickness direction of the mica plate is provided in the weak region, and the through groove extends along the second direction.

4. The mica plate according to claim 3, characterized in that The width L1 of the through groove in the first direction satisfies: 2mm ≤ L1 ≤ 5mm.

5. The mica plate according to claim 3, characterized in that, The distance L2 between the through groove and the thinning region satisfies: 3mm ≤ L2 ≤ 6mm.

6. The mica plate according to claim 3, wherein At least one end of the through groove in the second direction is spaced from the edge of the mica plate.

7. The mica plate according to claim 6, characterized in that, The distance L3 between the end of the through groove in the second direction and the edge of the mica plate satisfies: 8mm ≤ L3 ≤ 20mm.

8. The mica plate according to any one of claims 1-7, characterized in that, A sinking groove is provided in the thinning region, and the thickness M1 of the bottom wall of the sinking groove satisfies: 0.1mm ≤ M1 ≤ 0.3mm; and / or, The thickness M2 of the region of the mica plate other than the thinning region satisfies: 0.5mm ≤ M2 ≤ 1mm.

9. A battery, characterized in that, Comprising: A battery cell group, including a plurality of battery cells, and the battery cells are provided with explosion-proof valves; The mica plate according to any one of claims 1-8, covering the surfaces of the plurality of battery cells provided with the explosion-proof valves.

10. A vehicle, characterized in that, Including the battery according to claim 9, and the battery is used to supply electrical energy to the vehicle.

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