Battery and battery pack

Abstract

The utility model relates to the field of batteries, and discloses a battery and a battery pack. The battery comprises a shell and a cover plate, the cover plate comprises a cover plate body and a pole assembly, the surface of the cover plate is provided with an insulating film layer, the insulating film layer at least partially covers the outer surface of the cover plate, the insulating film layer is provided with an opening to form an area exposing part of the cover plate body, the opening is arranged corresponding to the cover plate, and the insulating coating covers at least part of the opening. The thickness of the insulating coating is smaller than that of at least part of the insulating film layer. The battery provided by the utility model can have better heat dissipation performance.

Description

[0001] This application is a divisional application. The original application has the application number 202421741099.6 and the original application date is July 23, 2024. The original application is entitled "A Battery and Battery Pack". The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery and a battery pack. Background Technology

[0003] To prevent short circuits between batteries, existing commercial batteries typically have an insulating film covering the outside of the battery casing. The terminals on the cover plate serve as electrode leads and bear the main current-carrying function, generating a significant amount of heat. This can easily lead to heat concentration at the cover plate location, which is detrimental to battery heat dissipation and the improvement of safety and stability. Utility Model Content

[0004] This application discloses a battery and a battery pack for improving heat dissipation at the cover plate, thereby improving the safety and stability of the battery.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] In a first aspect, this application provides a battery, which includes a casing and a cover plate. The cover plate includes a cover plate body and an electrode assembly disposed on the cover plate body. An insulating film layer is provided on the surface of the cover plate. The insulating film layer at least partially covers the outer surface of the cover plate. The insulating film layer has an opening. The opening is disposed corresponding to the cover plate to form an area exposing a portion of the cover plate body. An insulating coating covers at least a portion of the opening. The thickness of the insulating coating is less than the thickness of at least a portion of the insulating film layer.

[0007] The insulating film layer includes a covering film and an insulating top plate;

[0008] Along the length of the cover plate, the length of the insulating top plate is less than the length of the cover plate, and an opening is provided between the covering film and the insulating top plate;

[0009] The ratio of the area of ​​the insulating coating to the total area of ​​the cover plate is 0.01-0.4.

[0010] The battery of this application has a coating film on the outer surface of the casing for insulation between the batteries. An insulating film layer is provided on the outer surface of the cover to protect the insulation of the cover. The insulating film layer has openings in the corresponding areas of the cover, and the insulating coating covers at least part of the openings. The thickness of the insulating coating is less than the thickness of at least part of the insulating film layer, thereby improving the heat dissipation of the cover by using a thinner insulating coating, preventing heat from accumulating at the cover, and thus improving the safety and stability of the battery.

[0011] Secondly, this application provides a battery pack comprising at least two batteries of this application, wherein the at least two batteries are arranged along the width direction of the batteries.

[0012] The battery pack of this application, having the battery of this application, can have all the advantages of the first aspect of this application, which will not be repeated here. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a battery provided in an embodiment of this application;

[0014] Figure 2 This is a schematic diagram of the structure of a battery provided in an embodiment of this application;

[0015] Figure 3 This is a schematic diagram of a battery pack provided in an embodiment of this application.

[0016] Icon labels:

[0017] 01-Battery; 10-Casing; 11-Coating; 111-First side; 112-Second side;

[0018] 20-Cover plate; 21-Pole post; 211-Positive pole post; 212-Negative pole post; 22-Pressure relief mechanism; 23-Opening;

[0019] 24 - Insulating coating; 30 - Insulating top plate; 02 - Pressure strip. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Figure 1 This is a schematic diagram of the structure of a battery. Figure 1 As shown, the battery includes a casing, a battery cell, and a cover plate. The casing has an opening, and the cover plate closes at the opening to form a receiving cavity. The battery cell is disposed within the receiving cavity. The battery cell can be a stacked cell or a wound cell. Stacked cells are formed through a lamination process, while wound cells are formed through a winding process.

[0022] like Figure 1 As shown, the shell has a cuboid structure. The length direction of the cover plate 20 is the same as the length direction of the shell 10, as shown... Figure 1 The x-direction is shown in the diagram. The width direction of the cover plate 20 is the same as the width direction of the housing 10, as shown in the diagram. Figure 1The y-direction is shown in the diagram. The thickness direction of the cover plate 20 is the height direction of the housing 10, as shown in the diagram. Figure 1 The z-direction is shown in the diagram.

[0023] Reference Figure 1 The battery cover 20 can be a metal cover, such as an aluminum alloy cover, a stainless steel cover, or a carbon steel cover. The cover 20 may include a cover body and structures such as an electrode assembly 21 and a liquid filling port (not shown in the figure) disposed on the cover body, and may also include a pressure relief mechanism 22. The electrode assembly 21 includes at least two electrodes, namely a positive electrode 211 and a negative electrode 212. The thickness direction of the electrodes is consistent with the thickness direction of the cover.

[0024] The cover plate has an insulating film layer on its surface. The insulating film layer at least partially covers the outer surface of the cover plate. In one embodiment, the insulating film layer includes at least one of a covering film and an insulating top plate. When the insulating film layer includes a covering film, the covering film may cover the outer surface of the housing and extend from the outer surface of the housing to at least a portion of the surface of the cover plate body. When the insulating film layer includes an insulating top plate, the insulating top plate is only provided on the surface of the cover plate.

[0025] Figure 2 This is a top view schematic diagram of a battery according to one embodiment. In the battery of this application, the insulating film layer has an opening 23, which corresponds to the cover plate 20. An insulating coating 24 covers at least part of the opening 23, and the thickness of the insulating coating 24 is less than the thickness of at least part of the insulating film layer. Typically, an insulating top plate is provided on the surface of the cover plate, and the thickness of the insulating top plate is generally relatively thick. In order to achieve insulation, it is usually the same size as the cover plate, which makes it easy for heat to accumulate at the cover plate location, thereby affecting the safety of the battery. Furthermore, the cover plate is electrically connected to the cell through the electrode post. If the heat of the cover plate is too high, it may cause the heat of the cover plate to be transferred back to the cell. In some batteries, since the negative electrode sheet is relatively close to the cover plate, the kinetic performance of the negative electrode material will deteriorate at high temperatures, thereby reducing the electrical performance of the battery. Therefore, by providing an opening in the insulating film layer on the surface of the cover plate and by providing an insulating coating with a thickness less than the insulating film layer, a portion of the cover plate can use a thinner insulating coating for heat dissipation, which can improve the heat dissipation performance of the cover plate, thereby improving the safety and performance stability of the battery.

[0026] The insulating coating 24 can be formed by spraying or brushing. After spraying or brushing, the slurry can be cured by light or heat to form the insulating coating. The insulating coating 24 can be, for example, a polyethylene coating, a polyurethane coating, an epoxy resin coating, a potassium silicate coating, or a siloxane coating. Compared to the covering film, the insulating coating has a tighter bond with the cover plate and better insulation barrier properties. To avoid affecting heat dissipation at the insulating coating area, the thickness of the insulating coating is less than the thickness of the insulating top plate.

[0027] The battery casing 10 is a metal casing, such as a stainless steel casing, aluminum alloy casing, or carbon steel casing. To prevent short circuits between batteries, a coating film 11, which can be a PET coating film, is provided on the outer surface of the casing 10. By providing the coating film 11 on the outer surface of the casing 10, short circuits between batteries can be prevented. The coating film 11 is formed on the outer surface of the casing in a covering manner. Furthermore, the coating film 11 can extend along the surface of the casing to a portion of the surface of the cover plate body. Figure 2 As shown, the covering film 11 can extend to the junction of the housing and the cover plate 20 and cover the edge area of ​​the cover plate body.

[0028] The outer surface of the cover plate 20 is provided with an insulating top plate 30, which may be, for example, a PC board or a PET board. In one embodiment, such as... Figure 2 As shown, the edge of the long side of the insulating top plate 30 and the covering film 11 overlap at the edge of the long side of the cover plate, but do not overlap in the middle area. This increases the insulation performance of the cover plate while preventing the insulating top plate 30 and the covering film 11 from completely overlapping, thus reducing the heat dissipation of the cover plate 20 and achieving the purpose of reducing heat concentration. The edge refers to the portion of the cover plate extending inward from its circumferential outline. The middle area is located in the central region of the cover plate, encompassing the area excluding the edge region.

[0029] In one embodiment, the ratio of the thickness of the insulating coating to the thickness of the insulating top plate satisfies 0.005-0.95. Exemplarily, the ratio of the thickness of the insulating coating to the thickness of the insulating top plate may be, for example, 0.005, 0.01, 0.15, 0.02, 0.25, 0.03, 0.035, 0.04, 0.045, 0.05, 0.055, 0.06, 0.065, 0.07, 0.075, 0.08, 0.085, 0.09, or 0.095, or any two of these values. The thickness direction of the insulating coating is consistent with the thickness direction of the cover plate and perpendicular to the large surface direction of the cover plate.

[0030] In one embodiment, the length of the insulating top plate is less than the length of the cover plate along its length, and an opening is provided between the covering film and the insulating top plate. In this embodiment, the shorter length of the insulating top plate reduces the coverage area of ​​the insulating top plate and the overlap area between the insulating top plate and the covering film, thereby reducing heat concentration.

[0031] In one embodiment, the electrode assembly includes a positive electrode and a negative electrode, with two openings. Each opening is formed by a covering film and an insulating top plate. One opening is located between the edge of the positive electrode and the edge of the cover plate adjacent to the positive electrode, and the other opening is located between the edge of the negative electrode and the edge of the cover plate adjacent to the negative electrode. The openings near both electrodes improve heat dissipation at the electrodes and prevent heat concentration.

[0032] In one embodiment, the gap between the covering film and the insulating coating is greater than or equal to 0 and less than or equal to 1 mm. Exemplarily, the gap between the covering film and the insulating coating can be, for example, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, or any two of these values. The gap between the insulating coating and the covering film must not be too large, otherwise it will reduce the insulation performance of the cover plate. When the gap between the covering film and the insulating coating is 0, it indicates that the covering film and the insulating coating are in contact or partially overlap.

[0033] In one embodiment, an opening is provided on the insulating top plate. The opening reduces the area of ​​the insulating top plate, increases heat dissipation, and improves insulation performance.

[0034] In one embodiment, along the length of the cover plate, the distance between the opening and the edge of the cover plate adjacent to the opening is 0.5-10mm, and can be, for example, any two values ​​between 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm or more.

[0035] The adjacent sides of the cover plate intersect at a transition section, referred to as the corner. The opening should not be too close to the cover plate. At the corner, the coating is prone to dripping. If the opening is too close to the corner of the cover plate, the insulating coating is also prone to dripping, resulting in poor insulation performance at the corner.

[0036] The distance between the opening and the adjacent insulating top plate is 5-50mm, and can be any value between two of the following: 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, or more. This distance represents the distance between the side of the opening furthest from the insulating top plate and the insulating top plate itself. The opening should not be too close to the insulating top plate; otherwise, the area covered by the insulating coating will be small, resulting in a small heat dissipation area. Conversely, the opening should not be too far from the insulating top plate; otherwise, the insulating top plate may not provide adequate insulation to the pole, or the opening may be too close to a corner. The distance between the opening and the adjacent pole is 6-250mm, and can be any value between two of the following: 6mm, 10mm, 20mm, 50mm, 80mm, 100mm, 120mm, 150mm, 180mm, 200mm, or 250mm, or more. The opening should not be too close to the electrode post, as this can easily cause the electrode post to overheat and the insulating coating to melt. It should also not be too far away, as this will prevent the heat from the electrode post from dissipating quickly and effectively.

[0037] In one embodiment, the insulating coating covers all openings to increase the insulation performance of the cover.

[0038] In one embodiment, the insulating coating covers the entire opening, with the coverage area extending beyond the edge line of the opening and partially overlapping with the covering film to increase the insulation performance of the cover plate.

[0039] In one embodiment, the insulating coating partially overlaps with the covering film, with the covering film located below the insulating coating. The covering film is first applied to a portion of the housing and cover surface, and then the insulating coating is applied at the opening. The insulating coating acts to press down on the edges of the covering film, preventing warping.

[0040] In one embodiment, the insulating coating and the covering film partially overlap, with the covering film positioned above the insulating coating. The insulating coating is applied first at the opening, followed by the covering film. During the application of the insulating coating, some areas may not be properly coated; the covering film, placed on top of the insulating coating, enhances the insulation effect.

[0041] In one embodiment, the thickness relationship between the insulating coating and the covering film is 0.01-3, and can be, for example, any two values ​​between 0.01, 0.1, 0.5, 0.8, 1.0, 1.2, 1.5, 2.0, 2.5, 3, or more. This ratio cannot be too large; if it is too large, the insulating coating will be too thick, increasing the overall height after the pressure strip is connected. Conversely, if the ratio is too small, after the insulating top plate is placed on the cover plate surface, the gap between the covering film and the insulating coating can easily allow material to leak in, potentially causing a short circuit if it falls onto the pole.

[0042] In one embodiment, the covering film has an overlapping area at the corner of the cover plate. The ratio of the thickness of the insulating coating to the thickness of the overlapping area satisfies 0.003-1, and can be, for example, any two values ​​between 0.003, 0.001, 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, or higher. The corner is the location where two adjacent side plates of the cover plate intersect. When the covering film is applied, after it is folded onto the cover plate surface, an overlapping area will exist at the corner. The overlapping area has at least two layers of covering film. If the thickness of the overlapping area is too thick, it will affect heat dissipation; if the thickness of the insulating coating is less than the thickness of the overlapping area, the heat dissipation capacity of the cover plate will be improved.

[0043] In one embodiment, the area of ​​the overlapping region / area of ​​the insulating coating ranges from 0.0008 to 3, and can be, exemplarily, any two values ​​between 0.0008, 0.003, 0.001, 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.2, 1.5, 1.8, 2.0, 2.2, 2.5, 2.8, 3.0, or more. A larger overlapping region allows for a slightly larger insulating coating area to increase heat dissipation and thus improve the overall heat dissipation capacity of the cover plate.

[0044] In one embodiment, the insulating coating at least partially overlaps with the overlapping area. The overlapping area is located at the corner of the cover plate, and the insulating coating and the overlapping area partially overlap to ensure insulation performance at the corner.

[0045] In one embodiment, the insulating top plate and the insulating coating partially overlap along the length of the cover plate.

[0046] In one embodiment, the ratio of the total area of ​​the insulating coating to the total area of ​​the cover plate is between 0.005 and 0.4, and can be, for example, 0.005, 0.01, 0.02, 0.05, 0.08, 0.10, 0.12, 0.15, 0.18, 0.20, 0.25, 0.30, 0.35, 0.4, or any two of these values. If this ratio is too small, it means the area of ​​the insulating coating is relatively small, reducing the area for rapid heat dissipation and hindering heat dissipation from the cover plate. If this ratio is too large, it means the area of ​​the insulating coating is too large, reducing the area of ​​the insulating top plate and negatively impacting the insulation performance between the battery and the busbar.

[0047] In one embodiment, the electrode assembly includes at least two electrodes, a positive electrode and a negative electrode. The area S1 of the electrode, the thickness h of the electrode, the area S0 of the insulating coating, and the thickness d1 of the insulating coating satisfy the condition that S1*h*(S0 / d1) is in the range of 0.15 to 260000. Exemplarily, it can be any value between two of the following: 0.15, 1, 5, 10, 100, 500, 1000, 5000, 10000, 50000, 100000, 200000, 260000, or more. The unit of the area S1 of the electrode is mm. 2 The thickness h of the electrode post is in mm, and the area S0 of the insulating coating is in mm. 2 The smaller the terminal area and height, the smaller the current-carrying area, which increases heat generation. Therefore, the area and thickness of the insulating coating need to be larger. The terminal area is the area of ​​the end face furthest from the battery cell, and the terminal thickness is the distance between the end face closest to and furthest from the battery cell.

[0048] In one embodiment, the battery includes a cell, which comprises a cell body and tabs, the tabs being electrically connected to an electrode assembly. The tabs and electrodes can be directly connected or indirectly connected, such as using an adapter plate for indirect connection. The total thickness of the tabs, the thickness of the electrodes, and the thickness of the insulating coating satisfy the following relationship: total thickness of tabs * thickness of electrodes / thickness of insulating coating satisfies 0.75 to 12000, where the units for the thickness of the electrodes, the total thickness of the tabs, and the thickness of the insulating coating are mm.

[0049] For example, it can be a value between any two values ​​of 0.75, 1, 10, 100, 500, 1000, 5000, 10000, 12000, or higher. The total thickness of the tabs is the thickness of a single tab in the cell multiplied by the total number of tab layers. The thinner the total thickness of the tabs, the thinner the corresponding electrode post, resulting in a poorer current flow area and increased heat generation. In this case, the insulation coating thickness needs to be smaller to improve heat dissipation.

[0050] In one optional embodiment, the distance between the insulating coating and the adjacent electrode post along the length of the cover plate is 2-300 mm. The distance between the insulating coating and the electrode post can be, for example, 2 mm, 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 120 mm, 130 mm, 140 mm, 150 mm, 180 mm, 200 mm, 250 mm, 300 mm, or any two of these values. Controlling the distance between the insulating coating and the electrode post within the above range effectively controls the proportion of the insulating coating, preventing the distance between the insulating coating and the electrode post from being too far, which would prevent the insulating coating from quickly transferring heat from the electrode post to the outside. It also prevents the distance from the insulating coating and the electrode post from being too small, which would cause the heat from the electrode post to melt the insulating coating and damage its performance.

[0051] In one alternative embodiment, the insulating top plate and the insulating coating partially overlap along the length of the cover plate to improve the overall insulation performance of the cover plate.

[0052] For the same technical purpose, embodiments of this application also provide a battery pack. Figure 3 This is a schematic diagram of a battery pack structure. Figure 3 As shown, the battery pack includes multiple batteries 01 as described in this application. The batteries are arranged along their width direction, which coincides with the width direction of the cover plate, i.e., the direction perpendicular to the large surface of the batteries. Reference is also made to this embodiment. Figure 1 The housing 10 includes four sides and a bottom surface. Two of the four sides are oppositely arranged first sides 111, and two are oppositely arranged second sides 112. The area of ​​the first sides 111 is larger than the area of ​​the second sides 112. That is, the first sides 111 are the larger surface of the battery, and the second sides 112 are the smaller surface of the battery.

[0053] In one embodiment, reference is made to... Figure 3 The battery pack also includes a pressure strip 02, which is bonded to an insulating coating and connects at least two batteries 01 in the arrangement direction of at least two batteries.

[0054] In one embodiment, the extension direction of the pressure strip is perpendicular to the length direction of the battery. The pressure strip is used to connect multiple batteries, ensuring the stability of the connection between the batteries and preventing them from shifting during transportation or use. Compared to bonding with a traditional coating film, the adhesive strength between the insulating coating and the pressure strip is greater. By bonding the pressure strip to the insulating coating, the reliability of the connection between the pressure strip and the cover plate can be ensured, thereby ensuring the stability of the connection between multiple batteries.

[0055] The thickness of the pressure strip multiplied by the thickness of the insulating coating is 0.0002-0.6 mm, and can be, for example, 0.00002, 0.002, 0.005, 0.01, 0.02, 0.05, 0.08, 0.1, 0.15, 0.2, 0.3, 0.4, 0.45, 0.5, 0.55, 0.6, or any two of these values. The units for both the pressure strip thickness and the insulating coating thickness are mm. When the pressure strip thickness is set to be thicker, the insulating coating can be set to be thinner to avoid increasing the overall height of the battery pack. Conversely, when the pressure strip thickness is set to be thinner, the adhesive layer between the insulating coating and the pressure strip can be made thicker during bonding to increase adhesion strength.

[0056] In one embodiment, the width of the pressure strip / width of the insulating coating is 0.5-10, and exemplaryly can be any two values ​​between 0.5, 1.0, 1.5, 2.0, 2.5, 3, 4, 5, 6, 7, 8, 9, or 10 or more. The width of the insulating coating is its dimension along the length of the cover plate. The width of the pressure strip is its dimension along the length of the cover plate. This ratio ensures sufficient contact between the pressure strip and the insulating coating, guaranteeing connection strength.

[0057] In one embodiment, there are two openings, and the two openings are centrally symmetrical. The openings are centrally symmetrically arranged, with the center being the center of the surface of the battery used to connect the cover plate, which facilitates the connection of the pressure strip and the cover plate. The connection can also be achieved by rotating the cover plate 180°.

[0058] In one embodiment, along the length of the cover plate, the distance between the pressure strip and the edge of the battery is 0-30mm, exemplarily 0.1mm, 0.5mm, 1mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, or any two of these values, to prevent the pressure strip from extending beyond the battery edge and increasing the battery's lateral dimensions. This distance cannot be too large; if it is, the pressure strip will occupy space in other battery structures, affecting the placement of electrode assemblies, requiring the electrode assemblies to be positioned closer to the battery center. This increases the electron transport path of the electrode edges, making lithium plating more likely to occur at the electrode edges. When the distance is 0, the pressure strip is aligned with the battery edge, or the pressure strip may extend beyond the battery edge; both of these situations should be understood as equal to 0.

[0059] In one embodiment, along the length of the cover plate, the distance between the pressure strip and the adjacent electrode post is 0-50mm, exemplarily a value between any two of the following: 0.1mm, 0.5mm, 1mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, or more. If the distance between the pressure strip and the electrode post assembly is too far, the electrode post needs to be positioned towards the center, increasing the electron transport path of the electrode plates at the edge of the cell, making lithium plating more likely to occur at the edge of the electrode plates. Alternatively, if the pressure strip is too close to the edge of the battery, that is, too close to the corner of the battery, it will affect the heat dissipation at the corner.

[0060] In one embodiment, the bonding area of ​​the pressure strip and the insulating coating / the area of ​​the insulating coating is 0.5-1.5, and can be, exemplarily, any two values ​​between 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, or more. Controlling the bonding area of ​​the pressure strip within the above ratio range makes the connection between the pressure strip and the insulating coating more stable.

[0061] In one embodiment, along the arrangement direction of the plurality of batteries, the openings between adjacent batteries are arranged opposite each other, and at least two adjacent batteries are bonded to the same pressure strip. The openings on the same side of the batteries can be pressed together with the same pressure strip, which facilitates assembly.

[0062] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. A battery, characterized in that, The device includes a housing and a cover plate. The cover plate includes a cover plate body and an electrode assembly disposed on the cover plate body. An insulating film layer is provided on the surface of the cover plate. The insulating film layer at least partially covers the outer surface of the cover plate. The insulating film layer has an opening. The opening is disposed corresponding to the cover plate to form an area exposing a portion of the cover plate body. An insulating coating covers at least a portion of the opening. The thickness of the insulating coating is less than the thickness of at least a portion of the insulating film layer. The insulating film layer includes a covering film and an insulating top plate; Along the length of the cover plate, the length of the insulating top plate is less than the length of the cover plate, and the opening is provided between the covering film and the insulating top plate; The ratio of the area of ​​the insulating coating to the total area of ​​the cover plate is 0.01-0.

4.

2. The battery according to claim 1, characterized in that, The covering film is disposed on the outer surface of the housing and at least partially covers the surface of the cover plate; The insulating top plate and the covering film are arranged to overlap at the edges of the long side of the cover plate, but do not overlap in the middle area.

3. The battery according to claim 1, characterized in that, The electrode assembly includes a positive electrode and a negative electrode. There are two openings, each of which is formed by the covering film and the insulating top plate. One opening is located between the edge of the positive electrode and the edge of the cover plate adjacent to the positive electrode, and the other opening is located between the edge of the negative electrode and the edge of the cover plate adjacent to the negative electrode.

4. The battery according to any one of claims 1-3, characterized in that, The opening is provided on the insulating top plate.

5. The battery according to any one of claims 1-3, characterized in that, The insulating coating covers all of the openings.

6. The battery according to any one of claims 1-3, characterized in that, The insulating coating covers all the openings and partially overlaps with the covering film.

7. The battery according to claim 6, characterized in that, The insulating coating partially overlaps with the covering film, with the covering film located below the insulating coating, or the covering film located above the insulating coating.

8. The battery according to any one of claims 1-3, characterized in that, The covering film has an overlapping area at the corner of the cover plate, and the insulating coating at least partially overlaps with the overlapping area.

9. The battery according to any one of claims 1-3, characterized in that, Along the length of the cover plate, the insulating top plate and the insulating coating partially overlap.

10. A battery pack, characterized in that, It includes at least two batteries as described in any one of claims 1-9, wherein the at least two batteries are arranged along the width direction of the battery.

11. The battery pack according to claim 10, characterized in that, The battery pack further includes a retaining strip, which is bonded to the insulating coating and connects at least two of the batteries in the arrangement direction of the at least two batteries; The thickness of the pressure strip and the thickness of the insulating coating are 0.0002-0.6 mm, where the thickness of the pressure strip and the thickness of the insulating coating are both in mm.

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