battery

Abstract

The utility model relates to a battery field discloses a kind of battery, including shell, insulating film and multiple insulating gaskets, shell includes first wall;Battery core is set in shell;Insulating film wraps battery core, and insulating film includes the first membrane piece oppositely arranged along first direction with first wall, and the first membrane piece is provided with the notch for electrolyte to pass through;Multiple insulating gaskets are located between the first membrane piece and the first wall, and multiple insulating gaskets are spaced apart along second direction, and each insulating gasket includes the first face oppositely arranged along first direction with the first membrane piece, and the first face has the bonding area bonded with the first membrane piece, and bonding area avoids at least part of notch.The utility model ensures that insulating gasket supports the stability of battery core, and can also improve battery infiltration effect and reduce battery thermal runaway risk.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to batteries. Background Technology

[0002] With the rapid development of new energy technologies, battery applications are becoming increasingly widespread. Batteries are now widely used in vehicles and other fields. Currently, a bottom support plate is needed between the insulating film encasing the battery cell and the bottom wall of the casing to support the cell. However, the presence of the bottom support plate results in poor wetting and venting of the cell near the plate, thus reducing battery performance. Utility Model Content

[0003] This invention provides a battery to solve the problem of poor wetting and venting effects in the part of the battery cell near the bottom plate, which reduces battery performance.

[0004] This utility model provides a battery, comprising: a casing including a first wall; a battery cell disposed within the casing; an insulating film enclosing the battery cell, the insulating film including a first membrane sheet disposed opposite to the first wall along a first direction, the first membrane sheet having grooves for allowing electrolyte to pass through; and a plurality of insulating pads located between the first membrane sheet and the first wall, the plurality of insulating pads being spaced apart along a second direction, each insulating pad including a first surface opposite to the first membrane sheet along the first direction, the first surface having an adhesive area for bonding with the first membrane sheet, the adhesive area avoiding at least a portion of the grooves, the second direction being perpendicular to the first direction.

[0005] Beneficial effects: By spaced multiple insulating pads along the second direction, the stability of the battery cell is ensured, while the spacing between adjacent insulating pads improves electrolyte flow, enhances cell wetting, and thus improves battery performance. It also facilitates venting and heat dissipation, reducing the risk of thermal runaway. The first membrane has grooves for electrolyte permeation, and the adhesive area on the first surface of the insulating pads avoids these grooves, allowing electrolyte to pass smoothly through most of them, improving cell wetting. Simultaneously, gases venting from the grooves can also be effectively discharged through the space between adjacent insulating pads, reducing the risk of battery thermal runaway.

[0006] In some embodiments, the insulating gasket is thermally bonded to the first diaphragm via the bonding area; the insulating gasket further includes a second surface facing away from the first diaphragm along the first direction, the second surface being provided with a thinning groove, the bottom wall of the thinning groove being correspondingly provided with the bonding area.

[0007] Beneficial effects: The insulating pad has a thinning groove on its second side away from the first diaphragm along the first direction. The bottom wall of the thinning groove is set to correspond with the bonding area, which makes it easier for the bonding area to be thermally bonded to the first diaphragm, improving the bonding quality and thus improving the bonding reliability.

[0008] In some embodiments, the number of the thinning grooves on a single insulating pad is greater than or equal to 1 and less than or equal to 6.

[0009] Beneficial effects: The more thinning grooves there are, the more bonding areas there are, and the larger the total bonding area between the insulating gasket and the first diaphragm, resulting in a stronger bond. However, too many thinning grooves will encroach on the supporting area of ​​the insulating gasket for the battery cell, leading to unstable support. Therefore, the number of thinning grooves on a single insulating gasket should be greater than or equal to 1 and less than or equal to 6. This ensures both the total bonding area between the insulating gasket and the first diaphragm, ensuring strong bonding, and the supporting area of ​​the insulating gasket for the battery cell, ensuring support stability.

[0010] In some embodiments, at least a portion of the insulating pads have a venting groove on their second surface. Along a third direction, the two ends of the venting groove extend to opposite edges of the insulating pad, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0011] Beneficial effects: The second side of the insulating pad is provided with an exhaust groove, and the two ends of the exhaust groove extend to the opposite two edges of the insulating pad. The exhaust groove guides the gas discharged from the groove, realizes directional exhaust, avoids excessive gas concentration leading to the risk of thermal runaway, and improves battery safety.

[0012] In some embodiments, two venting grooves are provided, and the two venting grooves are respectively located on both sides of the thinning groove along the second direction.

[0013] Beneficial effect: This configuration can further disperse exhaust gas and reduce the risk of thermal runaway.

[0014] In some embodiments, there is a gap between the edge of the thinning groove and the edge of the insulating pad.

[0015] Beneficial effect: This design avoids the thinning groove occupying too much area of ​​the insulating gasket, thus ensuring the supporting area and strength of the insulating gasket.

[0016] In some embodiments, the plurality of insulating pads form a plurality of insulating pad columns, each insulating pad column including a plurality of insulating pads spaced apart along the second direction, the plurality of insulating pad columns being spaced apart along a third direction, the first direction, the second direction and the third direction being perpendicular to each other.

[0017] Beneficial effect: This setting can improve the stability of the insulating pad supporting the battery cell.

[0018] In some embodiments, a plurality of grooves are provided, and the plurality of grooves form a plurality of groove columns. Each groove column includes a plurality of grooves spaced apart along the second direction. The plurality of groove columns are spaced apart along the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0019] Beneficial effects: This setup allows the electrolyte to pass through the grooves more smoothly and wet the battery cell, improving the wetting effect and also enhancing the venting effect.

[0020] In some embodiments, the first wall is provided with a pressure relief mechanism.

[0021] Beneficial effects: The first wall is equipped with a pressure relief mechanism, which is close to the groove. Gas generated inside the cell can be quickly discharged from the pressure relief mechanism after passing through the groove, further reducing the risk of thermal runaway caused by gas accumulation.

[0022] In some embodiments, the housing further includes a second wall opposite to the first wall along the first direction, the second wall being provided with electrode terminals electrically connected to the battery cell.

[0023] Beneficial effect: The electrode terminals are located on the second wall opposite to the first wall, which keeps the electrode terminals away from the pressure relief mechanism and reduces the risk of electrical connection failure caused by gas impact on the electrode terminals.

[0024] In some embodiments, the insulating film further includes two second films connected to the first film at both ends along a third direction, with an indentation provided at the connection between the first film and the second film, and the second film corresponding to the large surface of the battery cell.

[0025] Beneficial effect: The indentation facilitates the folding of the second diaphragm, thus better wrapping the large surface of the battery cell.

[0026] In some embodiments, the thickness of each insulating pad is greater than or equal to 0.3 mm and less than or equal to 3.5 mm.

[0027] Beneficial effects: An insulating gasket thickness of 0.3 mm or more can improve the strength of the insulating gasket, thereby improving the reliability of the support. However, if the insulating gasket is too thick, greater than 3.5 mm, it occupies a lot of space and reduces the volumetric energy density of the battery. Therefore, an insulating gasket thickness of 0.3 mm or more and less than or equal to 3.5 mm can improve the strength of the insulating gasket, improve the reliability of the support, and also improve the volumetric energy density of the battery.

[0028] In some embodiments, on a projection plane perpendicular to the first direction, the ratio of the sum of the projected areas of the plurality of insulating pads to the total projected area of ​​the first diaphragm is greater than or equal to 10% and less than or equal to 90%.

[0029] Beneficial effects: A ratio of the sum of the projected areas of multiple insulating pads to the total projected area of ​​the first diaphragm is greater than 10%, which can improve the support and stability of the insulating pads. However, if this ratio is too high, exceeding 90%, the fluidity of the electrolyte will be poor, which is not conducive to the electrolyte wetting the battery cell through the grooves. At the same time, excessive material usage is not conducive to weight reduction and increases material costs. Therefore, a ratio greater than or equal to 10% and less than or equal to 90% can improve the support and stability of the insulating pads, facilitate weight reduction, and reduce material costs.

[0030] In some embodiments, the number of insulating pads is greater than or equal to 2 and less than or equal to 25.

[0031] Beneficial effects: Having two or more insulating pads improves the support and stability of the insulating pads. However, if the number is too large (greater than 25), the spacing between adjacent insulating pads becomes too small, resulting in poor electrolyte flow and hindering electrolyte wetting of the battery cell through the grooves. Furthermore, excessive material usage is detrimental to weight reduction and increases material costs. Therefore, having two to 25 insulating pads improves the support and stability of the insulating pads while also promoting weight reduction and lowering material costs. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the battery structure according to an embodiment of the present invention; Figure 2 for Figure 1 Cross-sectional view cut along EE; Figure 3This is a schematic diagram of the internal structure of the battery according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the inner side surface of the insulating film in the unfolded state according to an embodiment of the present invention. Figure 5 This is a schematic diagram of the outer surface of the insulating film in the unfolded state according to an embodiment of the present invention; Figure 6 for Figure 5 Cross-sectional view cut along AA in the middle; Figure 7 This is a schematic diagram of the outer surface of the insulating film in an unfolded state according to another embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of an insulating gasket according to another embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures: 100-Battery; 10-Casing; 11-First wall; 111-Pressure relief mechanism; 12-Second wall; 20-Cell; 30-Insulating film; 31-First diaphragm; 311-Score; 311a-Score row; 32-Second diaphragm; 321-Indentation; 40-Insulating gasket; 401-First surface; 402-Second surface; 40a-Insulating gasket row; 41-Adhesive area; 42-Thinning groove; 43-Vent groove; 50-Electrode terminal; Z-First direction; X-Second direction; Y-Third direction. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] In related technologies, a bottom support plate is placed between the insulating film encasing the battery cell and the bottom wall of the casing to support the cell. However, the bottom support plate completely covers the entire space between the bottom of the battery cell and the bottom wall of the casing, forming a relatively enclosed area. During the electrolyte injection process and battery cycling, this enclosed area hinders the flow of electrolyte, causing a "dry zone" to easily form near the bottom support plate. This results in uneven electrolyte distribution, poor cell wetting, and decreased battery performance. Furthermore, it hinders venting and heat dissipation during battery cycling, posing a risk of thermal runaway.

[0037] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0038] According to an embodiment of the present invention, a battery 100 is provided, comprising: a casing 10, a battery cell 20, an insulating film 30, and a plurality of insulating pads 40. The casing 10 includes a first wall 11. The battery cell 20 is disposed within the casing 10. The insulating film 30 encloses the battery cell 20, and the insulating film 30 includes a first membrane 31 disposed opposite to the first wall 11 along a first direction Z, the first membrane 31 having grooves 311 for electrolyte permeation. A plurality of insulating pads 40 are located between the first membrane 31 and the first wall 11, the plurality of insulating pads 40 being spaced apart along a second direction X, each insulating pad 40 including a first surface 401 opposite to the first membrane 31 along the first direction Z, the first surface 401 having an adhesive area 41 for bonding with the first membrane 31, the adhesive area 41 avoiding at least part of the grooves 311, the second direction X being perpendicular to the first direction Z.

[0039] The first wall 11 can be any wall in the outer casing 10. As an example, the outer casing 10 includes a shell and a top cover. An opening is provided on one side of the shell, and the top cover closes the opening, so that the shell and top cover together form a space for accommodating the battery cell 20. The shell includes a bottom wall perpendicular to the first direction Z, and the first wall 11 can be the bottom wall. In embodiments of this invention, the first direction Z can be the height direction of the battery 100; the second direction X can be the length direction of the battery 100; and the third direction Y can be the width direction of the battery 100. The first direction Z, the second direction X, and the third direction Y are all perpendicular to each other.

[0040] The battery cell 20 includes a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate. The battery cell 20 can be a wound core or a stacked core.

[0041] The insulating film 30 is wrapped around the outer surface of the battery cell 20, providing insulation and binding for the battery cell 20. For example, the first diaphragm 31 of the insulating film 30 corresponds to the end face of the battery cell 20 perpendicular to the first direction Z.

[0042] The groove 311 on the first diaphragm 31 is used for electrolyte transmission. The groove 311 is a slit that runs through both surfaces of the first diaphragm 31 in the thickness direction. The groove 311 can be formed by stamping without removing material, that is, the edge of the groove 311 has burrs, which is different from the through hole formed after removing part of the material.

[0043] Insulating pads 40 are used to support the battery cell 20. The first surface 401 is the side of the insulating pad 40 closest to the first diaphragm 31. The bonding area 41 on the first surface 401 that adheres to the first diaphragm 31 can be the entire first surface 401 or only a portion of it; that is, a part or all of the first surface 401 is adhered to the first diaphragm 31. The bonding area 41, as the bonding point between the insulating pad 40 and the first diaphragm 31, avoids the notch 311. It can avoid all or most of the notch 311, allowing the electrolyte to wet the battery cell 20 through the notch 311 and facilitating gas discharge through the notch. Multiple insulating pads 40 are spaced apart along the second direction X. The space between adjacent insulating pads 40 facilitates electrolyte flow and gas passage, and also serves a heat dissipation function.

[0044] The bonding area 41 and the first diaphragm 31 can be bonded by hot melting, or by adhesives such as glue.

[0045] The insulating gaskets can be rectangular, round, or irregularly shaped. The materials used for the insulating gaskets can include polypropylene (PP), polyethylene (PE), and polybutylene terephthalate (PBT), among others.

[0046] By using multiple insulating pads 40 spaced apart along the second direction X, the stability of the battery cell 20 can be ensured. Simultaneously, the space between adjacent insulating pads 40 improves electrolyte flow, enhances cell wetting, and thus improves battery performance. It also facilitates venting and heat dissipation, reducing the risk of battery thermal runaway. The first membrane 31 has grooves 311 for electrolyte permeation. The adhesive area 41 on the first surface 401 of the insulating pad 40 avoids these grooves 311, allowing electrolyte to pass smoothly through most of them, thereby improving cell wetting. Simultaneously, gas vented from the grooves can also be smoothly discharged through the space between adjacent insulating pads 40, further reducing the risk of battery thermal runaway.

[0047] In some embodiments, the insulating gasket 40 is thermally bonded to the first diaphragm 31 via the bonding area 41. The insulating gasket 40 also includes a second surface 402 that is opposite to the first diaphragm 31 along the first direction Z. The second surface 402 is provided with a thinning groove 42, and the bottom wall of the thinning groove 42 is correspondingly provided with the bonding area 41.

[0048] The thinning groove 42 is a recessed structure formed on the second surface 402 of the insulating gasket 40 after removing part of the material; it is a blind groove, not a groove that penetrates both sides of the insulating gasket 40 in the thickness direction. The thickness of the insulating gasket 40 located in the thinning groove 42 is less than the thickness of other parts.

[0049] The bottom wall of the thinning groove 42 is correspondingly set to the bonding area 41, meaning that the bottom wall of the thinning groove 42 overlaps with the bonding area 41.

[0050] A thinning groove 42 is provided on the second surface 402 of the insulating pad 40 along the first direction Z away from the first diaphragm 31. The bottom wall of the thinning groove 42 is correspondingly provided with the bonding area 41, which makes it easier for the bonding area 41 to be thermally bonded to the first diaphragm 31, thereby improving the bonding quality and making the bonding more reliable.

[0051] In some embodiments, the number of thinning grooves 42 on a single insulating pad 40 is greater than or equal to 1 and less than or equal to 6. For example, 1, 2, 3, 4, 5 or 6.

[0052] The more thinning grooves 42 there are, the more bonding areas 41 there are, and the more bonding points there are between the insulating pad 40 and the first diaphragm 31, resulting in a more reliable bond. However, if there are too many thinning grooves 42, more than 6, they will encroach on the supporting area of ​​the insulating pad 40 supporting the battery cell 20, causing the battery cell 20 to be unstable. Therefore, the number of thinning grooves 42 on a single insulating pad 40 is greater than or equal to 1 and less than or equal to 6. This ensures both the strong bond between the insulating pad 40 and the first diaphragm 31 and the supporting area of ​​the insulating pad 40 supporting the battery cell 20, making the battery cell 20 more stable.

[0053] In some embodiments, refer to Figure 7 and Figure 8 Among the plurality of insulating pads 40, at least some of the insulating pads 40 have a second surface 402 provided with an exhaust groove 43, which extends to the opposite two edges of the insulating pad 40 along the third direction Y.

[0054] Multiple insulating gaskets 40 may have some insulating gaskets 40 with venting grooves 43 and others without venting grooves 43. Alternatively, all insulating gaskets 40 may have venting grooves 43.

[0055] A venting groove 43 is provided on the second surface 402 of the insulating pad 40. The two ends of the venting groove 43 extend to the opposite edges of the insulating pad 40. The venting groove 43 guides the gas generated inside the cell, thereby achieving directional venting, avoiding excessive gas concentration that could lead to local overheating and thermal runaway risk, and improving battery safety.

[0056] In some embodiments, two venting grooves 43 are provided, and the two venting grooves 43 are respectively located on both sides of the thinning groove 42 along the second direction X.

[0057] This configuration further disperses the exhaust gas, preventing it from becoming too concentrated and reducing the risk of thermal runaway.

[0058] In some embodiments, there is a gap between the edge of the thinning groove 42 and the edge of the insulating pad 40. That is, the thinning groove 42 does not extend to the edge of the insulating pad 40.

[0059] This design avoids the thinning groove 42 occupying too much area of ​​the insulating pad 40, thus ensuring the supporting area and supporting strength of the insulating pad 40.

[0060] In some embodiments, refer to Figure 7 Multiple insulating pads 40 form multiple insulating pad rows 40a, each insulating pad row 40a including multiple insulating pads 40 spaced apart along a second direction X, and multiple insulating pad rows 40 spaced apart along a third direction Y. Figure 7 The image shows two rows 40a of insulating pads spaced Y-spaced along a third direction.

[0061] This configuration enhances the stability of the insulating pad 40 in supporting the battery cell 20.

[0062] Multiple sipes 311 are provided, and multiple sipes 311 form multiple sipe columns 311a. Each sipe column 311a includes multiple sipes 311 spaced apart along the second direction X, and the multiple sipe columns 311a are distributed spaced apart along the third direction Y. Figure 5 Four rows of notches 311a are shown, spaced at intervals along the third direction Y.

[0063] This design allows the electrolyte to pass through the grooves 311 more smoothly to wet the battery cell 20, improving the wetting effect and also enhancing the venting effect.

[0064] In some embodiments, the first wall 11 is provided with a pressure relief mechanism 111. The pressure relief mechanism 111 may be an explosion-proof valve.

[0065] The first wall 11 is provided with a pressure relief mechanism 111, which is close to the groove 311. The gas discharged from the groove 311 can be quickly discharged from the pressure relief mechanism 111, further reducing the risk of gas accumulation leading to local overheating and thermal runaway.

[0066] In some embodiments, the housing 10 further includes a second wall 12 opposite to the first wall 11 along the first direction Z, and the second wall 12 is provided with electrode terminals 50 that are electrically connected to the battery cell 20.

[0067] Electrode terminal 50 is a component used to output electrical energy from inside the battery cell 20 to the outside. Electrode terminal 50 can be a pole. The second wall 12 can be the top cover mentioned above.

[0068] The electrode terminal 50 is disposed on the second wall 12 opposite to the first wall 11, so that the electrode terminal 50 is far away from the pressure relief mechanism 111, that is, gas and electricity are separated, reducing the risk of electrical connection failure caused by gas impacting the electrode terminal 50.

[0069] In some embodiments, the insulating film 30 further includes two second films 32 connected to the first film 31 at both ends along the third direction Y. An indentation 321 is provided at the connection between the first film 31 and the second film 32, and the second film 32 corresponds to the large surface of the cell 20.

[0070] The indentation 321 facilitates the folding of the second diaphragm 32, thereby better wrapping the large surface of the battery cell 20.

[0071] Understandably, the insulating film 30 also includes a film corresponding to the narrow face of the battery cell 20.

[0072] In some embodiments, the thickness of each insulating pad 40 along the first direction Z is greater than or equal to 0.3 mm and less than or equal to 3.5 mm. It can be any one of 0.3 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, or any value between two of them.

[0073] The thickness of the insulating pad 40 refers to the thickness of the portion of the insulating pad 40 outside the thinning groove 42, that is, the thickness between the first surface 401 and the second surface 402.

[0074] The thickness of the insulating pad 40 is greater than or equal to 0.3 mm, which can improve the strength of the insulating pad 40 and thus improve the support reliability. However, if the thickness of the insulating pad 40 is too large, greater than 3.5 mm, it will occupy a lot of space and reduce the volumetric energy density of the battery. Therefore, the thickness of the insulating pad 40 is greater than or equal to 0.3 mm and less than or equal to 3.5 mm, which can improve the strength of the insulating pad 40, improve the support reliability, and also improve the volumetric energy density of the battery.

[0075] In some embodiments, on a projection plane perpendicular to the first direction Z, the ratio of the sum of the projected areas of the plurality of insulating pads 40 to the total projected area of ​​the first diaphragm 31 is greater than or equal to 10% and less than or equal to 90%. It can be any one of 10%, 20%, 40%, 60%, 80%, 100%, or any combination thereof.

[0076] The ratio of the sum of the projected areas of the multiple insulating pads 40 to the total projected area of ​​the first diaphragm 31 is greater than 10%, which can improve the supporting stability of the insulating pads 40. However, if this ratio is too high, greater than 90%, the fluidity of the electrolyte will be poor, which is not conducive to the electrolyte wetting the battery cell 20 through the grooves 311. At the same time, too much material is used, which is not conducive to weight reduction and increases material costs. Therefore, this ratio is greater than or equal to 10% and less than or equal to 90%, which can improve the supporting stability of the insulating pads 40, facilitate weight reduction, and reduce material costs.

[0077] In some embodiments, the number of insulating pads 40 is greater than or equal to 2 and less than or equal to 25. The number of insulating pads 40 can be any one of 2, 5, 10, 15, 20, 25, 30, 35, 40 or any combination thereof.

[0078] Having two or more insulating pads 40 improves their support stability. However, if the number is too large (greater than 25), the spacing between adjacent insulating pads 40 becomes too small, resulting in poor electrolyte flow and hindering the electrolyte from wetting the battery cell 20 through the grooves 311. Furthermore, excessive material usage hinders weight reduction and increases material costs. Therefore, having two to 25 insulating pads 40 improves their support stability, promotes weight reduction, and lowers material costs.

[0079] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: The outer shell, including the first wall; The battery cell is disposed within the housing; An insulating film is used to wrap the battery cell. The insulating film includes a first membrane sheet disposed opposite to the first wall along a first direction. The first membrane sheet is provided with grooves for the electrolyte to pass through. A plurality of insulating pads are located between the first diaphragm and the first wall. The plurality of insulating pads are spaced apart along a second direction. Each insulating pad includes a first surface opposite to the first diaphragm along the first direction. The first surface has an adhesive area for bonding with the first diaphragm. The adhesive area avoids at least a portion of the groove. The second direction is perpendicular to the first direction.

2. The battery according to claim 1, characterized in that, The bonding area is thermally bonded to the first diaphragm. The insulating pad also includes a second surface facing away from the first diaphragm along the first direction, the second surface being provided with a thinning groove, the bottom wall of the thinning groove being correspondingly provided with the bonding area.

3. The battery according to claim 2, characterized in that, The number of the thinning grooves on a single insulating pad is greater than or equal to 1 and less than or equal to 6.

4. The battery according to claim 2, characterized in that, In the plurality of insulating pads, at least some of the insulating pads are provided with venting grooves on their second surface. Along a third direction, the two ends of the venting grooves extend to the opposite two edges of the insulating pads, and the first direction, the second direction and the third direction are perpendicular to each other.

5. The battery according to claim 4, characterized in that, Two exhaust grooves are provided, and the two exhaust grooves are respectively located on both sides of the thinning groove along the second direction.

6. The battery according to claim 2, characterized in that, There is a gap between the edge of the thinning groove and the edge of the insulating gasket.

7. The battery according to claim 1, characterized in that, The plurality of insulating pads form a plurality of insulating pad columns, each insulating pad column including a plurality of insulating pads spaced apart along the second direction, the plurality of insulating pad columns being spaced apart along a third direction, the first direction, the second direction, and the third direction being perpendicular to each other; and / or, The grooves are provided in multiple ways, and the multiple grooves form multiple groove columns. Each groove column includes multiple grooves spaced apart along the second direction. The multiple groove columns are distributed at intervals along the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

8. The battery according to any one of claims 1-7, characterized in that, The first wall is provided with a pressure relief mechanism; and / or, The housing also includes a second wall opposite to the first wall along the first direction, and the second wall is provided with electrode terminals that are electrically connected to the battery cell.

9. The battery according to any one of claims 1-7, characterized in that, The insulating film also includes two second films connected to the first film at both ends along a third direction. An indentation is provided at the connection between the first film and the second film, and the second film corresponds to the large surface of the battery cell.

10. The battery according to any one of claims 1-7, characterized in that, The thickness of each of the insulating pads along the first direction is greater than or equal to 0.3 mm and less than or equal to 3.5 mm; and / or, On a projection plane perpendicular to the first direction, the ratio of the sum of the projected areas of the plurality of insulating pads to the total projected area of ​​the first diaphragm is greater than or equal to 10% and less than or equal to 90%; and / or, The number of insulating pads is greater than or equal to 2 and less than or equal to 25; and / or, The insulating pad is rectangular or circular in shape.

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