Battery and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a battery and a battery device.The battery comprises a battery shell and an insulating coating, a liquid injection hole is formed in the first face of the battery shell, a rough area is arranged on the first face of the battery shell, the rough area surrounds the liquid injection hole, and the insulating coating is arranged on the rough area; the distance between the edge, deviating from the liquid injection hole, of the rough area and the liquid injection hole is a, the range of a is 1000-30000 microns, the roughness of the rough area is m, the range of m is 0.2-3 microns, and the range of the product of a and m is 200-90000 microns < 2 >; and the insulating coating is at least arranged in the rough area.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular, to a battery and a battery pack. Background Art

[0002] A battery device is often provided in an electric vehicle, and the battery device is used to provide power to the electric vehicle. One or more batteries are provided in the battery device, and the battery includes a battery housing and a battery cell, and the battery cell is provided in the battery housing. An electrolyte is also provided in the battery housing, and the battery cell is at least partially immersed in the electrolyte. An injection hole is provided on the battery housing, and the injection hole is used to inject the electrolyte into the battery housing. During the injection, the electrolyte will spill onto the surface of the battery housing. When the insulating coating is applied to the surface of the battery housing, the spilled electrolyte will affect the film formation of the insulating coating, thereby affecting the insulation performance of the battery.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The purpose of the present disclosure is to provide a battery and a battery pack, thereby ensuring the insulation performance of the battery to at least a certain extent.

[0005] According to one aspect of the present disclosure, there is provided a battery, comprising:

[0006] A battery case, wherein a liquid injection hole is arranged on the first surface of the battery case, and a rough area is arranged on the first surface of the battery case, the rough area surrounds the liquid injection hole, the distance between the edge of the rough area away from the liquid injection hole and the liquid injection hole is a, the range of a is 1000μm-30000μm, the roughness of the rough area is m, the range of m is 0.2μm-3μm, and the product range of a and m is 200μm 2 -90000μm 2 ;

[0007] An insulating coating is provided at least in the rough area.

[0008] The battery provided by the embodiment of the present disclosure includes a battery housing and an insulating coating, wherein a liquid injection hole is arranged on the first surface of the battery housing, and a rough area is arranged on the first surface of the battery housing, the rough area surrounds the liquid injection hole, the distance between the edge of the rough area away from the liquid injection hole and the liquid injection hole is a, a range of 1000μ-30000μm, the roughness of the rough area is m, m ranges from 0.2μm-3μm, and the product range of a and m is 200μm 2 -90000μm 2By setting the roughness of the rough area around the injection hole to 0.2μm-3μm, the problem of electrolyte leakage during electrolyte injection affecting the adhesion of the insulating coating to the battery shell is solved, thereby improving the insulation performance of the battery. And the product range of a and m is 200μm 2 -90000μm 2 On the one hand, it avoids the problem of difficulty in film formation of insulating coating caused by too small roughness of rough area, and on the other hand, it avoids the problem of too large roughness of rough area affecting the insulating effect of insulating coating.

[0009] According to another aspect of the present disclosure, a battery pack is provided, comprising the above-mentioned battery.

[0010] The battery pack provided by the embodiment of the present disclosure includes a battery, wherein a liquid injection hole is arranged on the first surface of the battery shell in the battery, and a rough area is arranged on the first surface of the battery shell, the rough area surrounds the liquid injection hole, and the distance between the edge of the rough area away from the liquid injection hole and the liquid injection hole is a, a range of 1000μ-30000μm, the roughness of the rough area is m, m ranges from 0.2μm-3μm, and the product range of a and m is 200μm 2 -90000μm 2 By setting the roughness of the rough area around the injection hole to 0.2μm-3μm, the problem of electrolyte leakage during electrolyte injection affecting the adhesion of the insulating coating to the battery shell is solved, thereby improving the insulation performance of the battery. And the product range of a and m is 200μm 2 -90000μm 2 On the one hand, it avoids the problem of difficulty in film formation of insulating coating caused by too small roughness of rough area, and on the other hand, it avoids the problem of too large roughness of rough area affecting the insulating effect of insulating coating.

[0011] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0013] Figure 1 A schematic diagram of the structure of a battery housing provided by an exemplary embodiment of the present disclosure;

[0014] Figure 2 A schematic diagram of the structure of a battery provided for an exemplary embodiment of the present disclosure;

[0015] Figure 3 A partial enlarged view of a battery provided for an exemplary embodiment of the present disclosure;

[0016] Figure 4 A partially enlarged view of another battery provided according to an exemplary embodiment of the present disclosure.

[0017] Description of reference numerals:

[0018] 10. Battery casing; 11. Liquid injection hole; 12. Rough area; 13. Second area; 20. Sealing pin; 30. Insulating coating. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0020] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0021] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0022] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0023] The exemplary embodiment of the present disclosure first provides a battery, such as Figure 1 , Figure 2 and Figure 3 As shown, the battery includes a battery case 10 and an insulating coating 30, a first surface of the battery case 10 is provided with a liquid injection hole 11, and a first surface of the battery case 10 is provided with a rough area 12, and the rough area 12 surrounds the liquid injection hole 11. The distance between the edge of the rough area 12 away from the liquid injection hole 11 and the liquid injection hole 11 is a, and the range of a is 1000μm-30000μm. The roughness of the rough area 12 is m, and the range of m is 0.2μm-3μm. The product of a and m is in the range of 200μm 2 -90000μm 2 The insulating coating 30 is provided at least on the rough area 12 .

[0024] The battery provided by the embodiment of the present disclosure includes a battery housing 10 and an insulating coating 30, wherein a liquid injection hole 11 is arranged on the first surface of the battery housing, and a rough area 12 is arranged on the first surface of the battery housing, the rough area 12 surrounds the liquid injection hole 11, and the distance between the edge of the rough area 12 away from the liquid injection hole 11 and the liquid injection hole 11 is a, a range of 1000μ-30000μm, the roughness of the rough area 12 is m, m ranges from 0.2μm-3μm, and the product range of a and m is 200μm 2 -90000μm 2 By setting the roughness of the rough area 12 around the injection hole 11 to 0.2μm-3μm, the problem of electrolyte leakage during electrolyte injection affecting the adhesion of the insulating coating to the battery housing 10 is solved, thereby improving the insulation performance of the battery. And the product range of a and m is 200μm 2 -90000μm 2 On the one hand, the problem of difficulty in film formation of the insulating coating due to too small roughness of the rough area 12 is avoided, and on the other hand, the problem of too large roughness of the rough area 12 affecting the insulating effect of the insulating coating is avoided.

[0025] Furthermore, the battery provided in the embodiment of the present disclosure may also include a battery cell and a pole, wherein the battery cell is disposed in the battery housing 10, the pole is disposed in the battery housing 10, and the pole is connected to the battery cell. An electrolyte is also disposed in the battery housing 10, and the battery cell is at least partially immersed in the electrolyte.

[0026] The following is a detailed description of each part of the battery provided by the embodiment of the present disclosure:

[0027] In the disclosed embodiment, the battery may be a cylindrical battery or a prismatic battery (e.g., a quadrangular prism battery or a hexagonal prism battery, etc.). When the battery is a cylindrical battery, the first surface of the battery housing 10 is an end surface of the battery housing 10. When the battery is a prismatic battery, the first surface of the battery housing 10 is any surface of the battery housing 10.

[0028] For example, the battery housing 10 may include a shell body, a first cover plate and a second cover plate, the shell body is a cylindrical structure with two ends open, and the first cover plate and the second cover plate are respectively blocked at both ends of the shell body. The first cover plate and the second cover plate are respectively sealed and connected to the shell body. The first cover plate and the second cover plate may be a separate molding structure with the shell body. Or one of the first cover plate and the second cover plate is integrally formed with the shell body, and the other is a separate molding structure with the shell body.

[0029] The injection hole 11 can be provided on the first cover plate or the second cover plate. For example, the first cover plate and the shell body are a separate molding structure, and the second cover plate and the shell body are an integral molding structure. The pole is provided on the first cover plate, and the injection hole 11 is provided on the second cover plate, or the pole and the injection hole 11 are both provided on the first cover plate, or the pole and the injection hole 11 are both provided on the second cover plate.

[0030] One or more poles may be provided on the first surface of the battery housing 10. For example, a pole is provided on the first surface of the battery housing 10, and the pole serves as one electrode end of the battery, and the battery housing 10 serves as another electrode end of the battery. Alternatively, a first pole and a second pole are provided on the first surface of the battery housing 10, and one of the first pole and the second pole is a positive pole, and the other of the first pole and the second pole is a negative pole.

[0031] In a feasible implementation, the rough area is distributed all over the first surface of the battery housing, that is, the roughness of the first surface of the battery housing is 0.2 μm-3 μm.

[0032] In another feasible embodiment, a part of the surface area of ​​the battery housing is a rough area. The first surface of the battery housing has a first area and a second area, the first area forms the rough area, the second area is located on the side of the first area away from the injection hole, and the roughness of the first area is greater than or equal to the roughness of the second area.

[0033] like Figure 4 As shown, the rough area is provided with a recessed portion (for example, the recessed portion may be staggered grooves or discretely distributed pits, etc.), the thickness of the battery shell is h, the depth of the recessed portion is n, h and n satisfy 0.0001≤n / h≤0.05, and the depth of the recessed portion is the size of the recessed portion in a direction perpendicular to the first surface of the battery shell 10. For example, the ratio of the thickness of the battery shell to the depth of the recessed portion is 0.0001, 0.0010, 01, 0.04 or 0.05, etc.

[0034] By setting the ratio of the thickness of the battery shell to the depth of the recessed portion to 0.0001-0.05, it is ensured that the roughness of the battery shell is increased without affecting the strength of the battery shell 10, which is beneficial to the film formation of the insulating coating 30.

[0035] It should be noted that in the embodiment of the present disclosure, the thickness of each part of the battery housing 10 may be uniform. When the thickness of each part of the battery housing 10 is uniform, h is the uniform thickness of the battery housing 10. Alternatively, the thickness of each part of the battery housing 10 is not uniform. When the thickness of each part of the battery housing 10 is not uniform, h is the thickness of the first surface of the battery housing 10.

[0036] In one embodiment, the injection hole 11 is a circular hole, and the radius of the injection hole 11 is b, 1 / 30≤b / a≤5. For example, the ratio of the radius of the injection hole 11 to the distance between the edge of the rough area and the injection hole 11 is 1 / 30, 1, 2, 3, 4 or 5. In practical applications, the larger the radius of the injection hole 11, the smaller the amount of liquid spilled during injection, and thus the smaller the contamination area of ​​the battery housing 10. Therefore, by setting the ratio of the radius of the injection hole 11 to the roughness of the rough area 12 to 1 / 30-5, on the one hand, the problem of being unable to completely remove the spilled liquid pollution due to the small area of ​​the rough area is avoided, and on the other hand, the problem of the rough groove area being too large, which affects the production efficiency, is also avoided.

[0037] The thickness of the insulating coating 30 is c, and the range of c is 60 μm-200 μm, and 12≤c / m≤600. For example, the ratio of the thickness of the insulating layer to the roughness of the rough area 12 can be 12, 20, 50, 100, 200, 400 or 500.

[0038] The roughness of the second area 13 is 0.2 μm-3 μm. For example, the roughness of the second area 13 may be 0.2 μm, 0.25 μm or 0.3 μm, etc. The roughness of the second area 13 may be the same as the roughness of other surfaces of the battery housing 10, that is, the roughness of the area outside the rough area 12 of the battery housing 10 is consistent. Alternatively, the roughness of the second area 13 may also be different from the roughness of other surfaces of the battery housing 10, and the embodiments of the present disclosure are not limited thereto.

[0039] The battery cell is arranged in the battery housing 10, the battery cell is connected to the pole, and the battery cell is immersed in the electrolyte. The battery cell includes a battery cell body and a pole ear, and the pole ear extends from the battery cell body; there are two pole ears on the battery cell body, the two pole ears are respectively a first pole ear (positive pole ear) and a second pole ear (negative pole ear), and the first pole ear and the second pole ear can be connected to corresponding adapters respectively.

[0040] It should be noted that the battery cell body may include more than two pole pieces, and the pole ears include more than two single-piece pole ears, which extend from the corresponding pole pieces respectively, and the width of the single-piece pole ears is smaller than the width of the pole piece. Multiple single-piece pole ears are stacked to form a pole ear.

[0041] In one embodiment, the battery is a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. The battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

[0042] Optionally, the battery cell may be a wound battery cell, that is, a first pole sheet, a second pole sheet having electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain the wound battery cell.

[0043] When the two electrode terminals of the battery are the first pole and the second pole, the first pole lug is connected to the first pole through the first adapter, and the second pole lug is connected to the second pole through the second adapter. When the two electrode terminals of the battery are the pole and the battery housing 10, the first pole lug is connected to the pole through the first adapter, and the second pole is connected to the battery housing 10 through the second adapter.

[0044] In the embodiment of the present disclosure, the rough area 12 is formed by laser grinding. In the battery cell, the minimum distance between the diaphragm and the portion where the rough area 12 is located on the battery housing 10 is 0-3 mm. By setting the minimum distance between the diaphragm and the portion where the rough area 12 is located on the battery housing 10 to 0-3 mm, it is ensured that the diaphragm will not be burned when the rough area 12 with a large roughness is formed by laser grinding, thereby improving the yield rate of the battery.

[0045] In a feasible implementation manner, the battery housing is an aluminum housing, and the minimum distance between the separator and the portion of the battery housing where the rough area is located is 0.1 mm to 2 mm.

[0046] In another feasible embodiment, the battery housing is a steel housing, and the minimum distance between the separator and the portion of the battery housing where the rough area is located is 0.5 mm to 3 mm.

[0047] The battery is a cylindrical battery, the roughness of the second surface of the battery shell is consistent with the roughness of the rough area, and the second surface of the battery shell is any surface other than the first surface of the battery shell.

[0048] It is understandable that the battery may also be a quadrangular prism battery. In the quadrangular prism battery, the roughness of the second surface of the battery housing is consistent with or inconsistent with the roughness of the rough area, and the second surface of the battery housing is any surface other than the first surface of the battery housing.

[0049] The insulating coating 30 is at least provided in the rough area 12. In practical applications, the insulating coating 30 can cover the battery housing 10. For example, the insulating coating 30 is coated on the surfaces of the first cover plate, the second cover plate and the shell body of the battery housing 10, and the pole is exposed to the insulating coating 30. The thickness of the insulating coating 30 in the rough area 12 may be consistent with or inconsistent with the thickness of the coating in other areas of the battery housing 10, and the number of layers of the insulating coating 30 in the rough area 12 may be the same as or different from the number of layers of the insulating coating 30 in other areas. The insulating coating 30 may be a UV insulating coating 30. The UV coating material can be seamlessly connected with the battery housing 10, providing more comprehensive protection for the battery and effectively preventing the risks of short circuit and thermal runaway.

[0050] Furthermore, in order to seal the injection hole 11, the battery provided in the embodiment of the present disclosure may further include a sealing nail 20, which is disposed at the injection hole 11. The sealing nail 20 has a main body area and a welding area, and the welding area is welded to the battery housing 10.

[0051] The main body area is a flat plate or a structure approximately similar to a flat plate. The welding area may include a first enclosure, a second enclosure and a connecting plate. The first enclosure is arranged around the main body area, and the first enclosure and the main body area are arranged vertically. One end of the first enclosure is connected to the main body area, and the other end of the first enclosure extends toward the direction close to the battery cell. The connecting plate is connected to the end of the first enclosure away from the main body area, the connecting plate surrounds the first enclosure, and the connecting plate extends outward. The second enclosure is connected to the outer edge of the connecting plate, the second enclosure is arranged parallel to the first enclosure, and there is a gap between the second enclosure and the first enclosure, and the gap forms a groove of the welding area.

[0052] The battery provided by the embodiment of the present disclosure includes a battery housing 10 and an insulating coating 30, wherein a liquid injection hole 11 is provided on a first surface of the battery housing 10, and a rough area 12 is provided on the first surface of the battery housing, wherein the rough area 12 surrounds the liquid injection hole 11, and the distance between the edge of the rough area 12 away from the liquid injection hole 11 and the liquid injection hole 11 is a, and the range of a is 1000μ-30000μm, the roughness of the rough area 12 is m, and the range of m is 0.2μm-3μm, and the product range of a and m is 200μm 2 -90000μm 2 By setting the roughness of the rough area 12 around the injection hole 11 to 0.2μm-3μm, the problem of electrolyte leakage during electrolyte injection affecting the adhesion of the insulating coating to the battery housing 10 is solved, thereby improving the insulation performance of the battery. And the product range of a and m is 200μm 2 -90000μm 2On the one hand, the problem of difficulty in film formation of the insulating coating due to too small roughness of the rough area 12 is avoided, and on the other hand, the problem of too large roughness of the rough area 12 affecting the insulating effect of the insulating coating is avoided.

[0053] The exemplary embodiment of the present disclosure also provides a battery pack, the battery pack includes a battery. The battery includes a battery case 10 and an insulating coating 30, a first surface of the battery case 10 is provided with a liquid injection hole 11, and a first surface of the battery case 10 is provided with a rough area 12, and the rough area 12 surrounds the liquid injection hole 11. The distance between the edge of the rough area 12 away from the liquid injection hole 11 and the liquid injection hole 11 is a, and the range of a is 1000μm-30000μm, the roughness of the rough area 12 is m, and the range of m is 0.2μm-3μm, and the product of a and m is in the range of 200μm 2 -90000μm 2 The insulating coating 30 is provided at least on the rough area 12 .

[0054] The battery pack provided by the embodiment of the present disclosure includes a battery, wherein a liquid injection hole 11 is provided on the first surface of a battery shell 10 in the battery, and a rough area 12 is provided on the first surface of the battery shell, the rough area 12 surrounds the liquid injection hole 11, and the distance between the edge of the rough area 12 away from the liquid injection hole 11 and the liquid injection hole 11 is a, a range of 1000μ-30000μm, the roughness of the rough area 12 is m, m ranges from 0.2μm-3μm, and the product range of a and m is 200μm 2 -90000μm 2 By setting the roughness of the rough area 12 around the injection hole 11 to 0.2μm-3μm, the problem of electrolyte leakage during electrolyte injection affecting the adhesion of the insulating coating to the battery housing 10 is solved, thereby improving the insulation performance of the battery. And the product range of a and m is 200μm 2 -90000μm 2 On the one hand, the problem of difficulty in film formation of the insulating coating due to too small roughness of the rough area 12 is avoided, and on the other hand, the problem of too large roughness of the rough area 12 affecting the insulating effect of the insulating coating is avoided.

[0055] Furthermore, the battery pack provided in the embodiment of the present disclosure may also include a box body, the box body has a battery compartment, and the battery is arranged in the battery compartment. For example, the box body may include a bottom plate and a frame, the frame and the bottom plate are connected, and the frame and the bottom plate surround a battery compartment for accommodating the battery. The battery is arranged in the battery compartment, and a plurality of batteries may be arranged in the battery compartment, and the plurality of batteries are arranged in the battery compartment according to a preset rule.

[0056] For example, the box body can be a rectangular parallelepiped or a structure approximately in the shape of a rectangular parallelepiped. The bottom plate is a rectangular flat plate structure, and the bottom plate supports the battery. The frame can include a first side beam, a second side beam, a third side beam and a fourth side beam, and the first side beam, the second side beam, the third side beam and the fourth side beam are connected end to end in sequence to form a rectangular frame. One or more partition beams can be provided in the frame, and the partition beams divide the space in the frame into multiple battery compartments. For example, a first partition beam and a second partition beam are vertically arranged in the frame, and the first partition beam and the second partition beam divide the space in the frame into four battery compartments.

[0057] The battery pack provided by the embodiment of the present disclosure includes a battery, wherein a liquid injection hole 11 is provided on the first surface of a battery shell 10 in the battery, and a rough area 12 is provided on the first surface of the battery shell, the rough area 12 surrounds the liquid injection hole 11, and the distance between the edge of the rough area 12 away from the liquid injection hole 11 and the liquid injection hole 11 is a, a range of 1000μ-30000μm, the roughness of the rough area 12 is m, m ranges from 0.2μm-3μm, and the product range of a and m is 200μm 2 -90000μm 2 By setting the roughness of the rough area 12 around the injection hole 11 to 0.2μm-3μm, the problem of electrolyte leakage during electrolyte injection affecting the adhesion of the insulating coating to the battery housing 10 is solved, thereby improving the insulation performance of the battery. And the product range of a and m is 200μm 2 -90000μm 2 On the one hand, the problem of difficulty in film formation of the insulating coating due to too small roughness of the rough area 12 is avoided, and on the other hand, the problem of too large roughness of the rough area 12 affecting the insulating effect of the insulating coating is avoided.

[0058] The battery pack provided by the embodiment of the present disclosure can be applied to an electric vehicle. In practical applications, the battery pack can be installed on the frame of the electric vehicle. The battery pack can be fixedly connected to the frame. Alternatively, the battery pack can be a modular battery pack, which can be detachably connected to the vehicle body for easy replacement.

[0059] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A battery, characterized in that: The battery comprises: A battery case, wherein a liquid injection hole is arranged on the first surface of the battery case, and a rough area is arranged on the first surface of the battery case, the rough area surrounds the liquid injection hole, the distance between the edge of the rough area away from the liquid injection hole and the liquid injection hole is a, the range of a is 1000μm-30000μm, the roughness of the rough area is m, the range of m is 0.2μm-3μm, and the product range of a and m is 200μm 2 -90000μm 2 ; An insulating coating is provided at least in the rough area.

2. The battery according to claim 1, characterized in that The injection hole is a circular hole, and the radius of the injection hole is b, 1 / 30≤b / a≤5.

3. The battery according to claim 1, characterized in that The thickness of the insulating coating is c, the range of c is 60 μm-200 μm, and 12≤c / m≤600.

4. The battery according to claim 1, characterized in that The first surface of the battery housing has a first area and a second area, the first area forms the rough area, the second area is located on a side of the first area away from the injection hole, and the roughness of the first area is greater than or equal to the roughness of the second area.

5. The battery according to any one of claims 1 to 4, characterized in that: The rough area is provided with a recessed portion, the thickness of the battery shell is h, the depth of the recessed portion is n, h and n satisfy 0.0001≤n / h≤0.05, and the depth of the recessed portion is the dimension of the recessed portion in a direction perpendicular to the first surface of the battery shell.

6. The battery according to claim 1, characterized in that The battery also includes: The battery core comprises a diaphragm, wherein the minimum distance between the diaphragm and the portion of the battery casing where the rough area is located is 0-3 mm.

7. The battery according to claim 6, characterized in that The battery shell is a steel shell, and the minimum distance between the diaphragm and the portion of the battery shell where the rough area is located is 0.5 mm to 3 mm.

8. The battery according to claim 6, characterized in that The battery shell is an aluminum shell, and the minimum distance between the diaphragm and the portion of the battery shell where the rough area is located is 0.1 mm to 2 mm.

9. The battery according to claim 6, characterized in that The battery is a cylindrical battery, the roughness of the second surface of the battery housing is consistent with the roughness of the rough area, and the second surface of the battery housing is any surface other than the first surface of the battery housing.

10. A battery pack, characterized in that: The battery pack comprises the battery according to any one of claims 1-9.

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