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

Technical Field

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

[0002] For existing commercial batteries, to avoid short circuits between batteries, an insulating film is usually coated on the outside of the battery case. The pole post provided on the cover plate serves as the electrode lead-out end and bears the main over-current function, generating a relatively high amount of heat, which easily causes the heat to be concentrated at the cover plate position, and is not conducive to the heat dissipation of the battery and the improvement of safety and stability. Summary of the Utility Model

[0003] This application discloses a battery and a battery pack, which are used to improve the heat dissipation at the cover plate, so as to improve the safety and stability of the battery.

[0004] To achieve the above object, this application provides the following technical solutions:

[0005] In a first aspect, this application provides a battery, which includes a case and a cover plate. The cover plate includes a cover plate body and a pole post assembly provided on the cover plate body. An insulating film layer is provided on the surface of the cover plate, and the insulating film layer at least partially covers the outer surface of the cover plate. The insulating film layer is provided with an opening, and the opening corresponds to the cover plate to form a region exposing at least part of the cover plate body. An insulating coating covers at least part of the opening, and the thickness of the insulating coating is less than the thickness of at least part of the insulating film layer.

[0006] For the battery of this application, the coating film provided on the outer surface of the case is used to achieve insulation between batteries. An insulating film layer is provided on the outer surface of the cover plate to protect the insulation of the cover plate. The insulating film layer is provided with an opening in the area corresponding to the cover plate, and the insulating coating covers at least part of the opening, and the thickness of the insulating coating is less than the thickness of at least part of the insulating film layer. Therefore, the thinner insulating coating can be used to improve the heat dissipation of the cover plate, avoid heat accumulation at the cover plate, and further achieve the purpose of improving the safety and stability of the battery.

[0007] In a second aspect, this application provides a battery pack, which includes at least two batteries of this application, and the at least two batteries are arranged along the width direction of the battery.

[0008] For the battery pack of this application, since it has the battery of this application, it can thus have all the advantages of the first aspect of this application, and will not be repeated here. Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of a battery provided by an embodiment of this application;

[0010] Figure 2 It is a schematic structural diagram of a battery provided by an embodiment of this application;

[0011] Figure 3 Schematic structural diagram of a battery pack provided by an embodiment of the present application.

[0012] Reference numerals in the drawings:

[0013] 01 - Battery; 10 - Housing; 11 - Coating film; 111 - First side; 112 - Second side;

[0014] 20 - Cover plate; 21 - Terminal post; 211 - Positive terminal post; 212 - Negative terminal post; 22 - Pressure relief mechanism; 23 - Opening;

[0015] 24 - Insulating coating; 30 - Insulating top plate; 02 - Batten. Detailed implementation manners

[0016] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0017] Figure 1 Schematic structural diagram of a battery. As Figure 1 shown, the battery includes a housing, an electric core, and a cover plate. The housing has a packaging opening, and the cover plate is covered at the packaging opening to form a receiving cavity. The electric core is disposed in the receiving cavity. The electric core can be a stacked core or a wound core. Among them, the stacked core is formed by a stacking process, and the wound core is formed by a winding process.

[0018] As Figure 1 shown, the housing is a cuboid structure. The length direction of the cover plate 20 is the length direction of the housing 10, such as the x direction shown in Figure 1 . The width direction of the cover plate 20 is the width direction of the housing 10, such as the y direction shown in Figure 1 . The thickness direction of the cover plate 20 is the height direction of the housing 10, such as the z direction shown in Figure 1 .

[0019] Referring to Figure 1 , the cover plate 20 of the battery can be a metal cover plate, for example, an aluminum alloy cover plate, a stainless steel cover plate, or a carbon steel cover plate, etc. The cover plate 20 can include a cover plate body and structural components such as a terminal post assembly 21 and a liquid injection port (not shown in the figure) provided on the cover plate body, and a pressure relief mechanism 22 can also be provided. The terminal post assembly 21 includes at least two terminal posts, namely a positive terminal post 211 and a negative terminal post 212. The thickness direction of the terminal post is the same as the thickness direction of the cover plate.

[0020] 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. In one embodiment, the insulating film layer includes at least one of a coating film and an insulating top plate. When the insulating film layer includes a coating film, the coating film can be coated on the outer surface of the housing and extend from the outer surface of the housing to at least a part 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.

[0021] Figure 2 It is a schematic top view structure diagram of a battery in one embodiment. In the battery of the present application, the insulating film layer is provided with an opening 23, the opening 23 corresponds to the cover plate 20, and the insulating coating 24 covers at least a part of the opening 23. The thickness of the insulating coating 24 is less than the thickness of at least a part of the insulating film layer. Generally, 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. And for insulation, it is usually the same size as the cover plate, which causes heat to easily accumulate at the position of the cover plate, thereby affecting the safety of the battery. In addition, the cover plate is electrically connected to the battery cell through a pole column. If the temperature of the cover plate is too high, it may also cause the heat of the cover plate to be reversely transferred back to the battery 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 providing an insulating coating with a thickness less than that of the insulating film layer, a part of the area of the cover plate uses the insulating coating with a thinner thickness for heat dissipation, which can improve the heat dissipation performance of the cover plate, and thereby improve the safety and performance stability of the battery.

[0022] Among them, the insulating coating 24 can be formed by spraying or brushing. After spraying or brushing the slurry, the slurry can be cured by light irradiation or heating 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, a silicone coating, etc. Compared with the coated coating film, the connection between the insulating coating and the cover plate is closer, and the insulation barrier property is better. In order not to affect the heat dissipation performance at the insulating coating, the thickness of the insulating coating is less than the thickness of the insulating top plate.

[0023] The housing 10 of the battery is a metal housing, such as a stainless steel housing, an aluminum alloy housing, a carbon steel housing, etc. To avoid short circuits between batteries, the outer surface of the housing 10 is provided with a coating film 11, and the coating film 11 can be a PET coating film. By providing the coating film 11 on the outer surface of the housing 10, short circuits between batteries can be prevented. Among them, the coating film 11 is formed on the outer surface of the housing in a coated form. In addition, since the coating film 11 can extend along the surface of the housing to a part of the surface of the cover plate body. As Figure 2 shown, the coating film 11 can extend to the joint of the housing and the cover plate 20 and cover the edge area of the cover plate body.

[0024] The outer surface of the cover plate 20 is provided with an insulating top plate 30, and the insulating top plate 30 can be, for example, a PC board or a PET board, etc. In one embodiment, as Figure 2 shown, the edge of the long side of the insulating top plate 30 overlaps with the edge of the long side of the covering film 11 on the cover plate, and the middle area does not overlap. While increasing the insulation performance of the cover plate, it is avoided that the insulating top plate 30 completely overlaps with the covering film 11, reducing the heat dissipation of the cover plate 20 to achieve the purpose of reducing heat concentration. Among them, the edge is a partial area extending inward from the circumferential contour line of the cover plate. The middle area is located in the middle area of the cover plate and is the area of the cover plate except the edge area.

[0025] 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 can 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 value between any two of the above values. The thickness direction of the insulating coating is the same as the thickness direction of the cover plate and is perpendicular to the large surface direction of the cover plate.

[0026] In one embodiment, along the length direction of the cover plate, the length of the insulating top plate is less than the length of the cover plate, and there is an opening between the covering film and the insulating top plate. In this embodiment, the length of the insulating top plate is less than the length of the cover plate, reducing the covering area of the insulating top plate and the overlapping area between the insulating top plate and the covering film, reducing heat concentration.

[0027] In one embodiment, the pole column assembly includes a positive pole column and a negative pole column, and there are two openings. Each opening is formed by enclosing the covering film and the insulating top plate. One opening is provided between the positive pole column and the edge of the cover plate adjacent to the positive pole column, and the other opening is provided between the negative pole column and the edge of the cover plate adjacent to the negative pole column. Openings are provided near both pole columns to improve heat dissipation at the pole columns and avoid heat concentration.

[0028] 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 value between any two of the above values. There is a gap between the insulating coating and the covering film, and the gap cannot be too large, otherwise it will reduce the insulation performance of the cover plate. Among them, when the gap between the covering film and the insulating coating is 0, it means that the covering film and the insulating coating are in contact or partially overlap.

[0029] In one embodiment, an opening is provided on the insulating top plate. The opening is provided on the insulating top plate, reducing the area of the insulating top plate, increasing heat dissipation, and having better insulation performance.

[0030] In one embodiment, along the length direction of the cover plate, the distance between the opening and the edge of the cover plate adjacent to the opening satisfies 0.5 - 10 mm, and can be, for example, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm or any value between any two of the above values.

[0031] Wherein, there is a transition part at the intersection of the adjacent side edges of the cover plate, and this transition part is simply called the corner. The opening cannot be too close to the position of the cover plate, especially at the corner position, where the paint is prone to sag. If the opening is too close to the corner of the cover plate, when the insulating coating is set, it is easy to sag, resulting in poor insulation performance at the corner position.

[0032] The distance between the opening and the insulating top plate adjacent to the opening is 5 - 50 mm, and can be, for example, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm or any value between any two of the above values. Among them, this distance represents the distance between the side of the opening far from the insulating top plate and the insulating top plate. The opening cannot be too close to the insulating top plate. If it is too close, the area for setting the insulating coating is small and the heat dissipation area is small. The opening also cannot be too far from the insulating top plate. When it is too far, either the insulating top plate cannot achieve good insulation for the pole column, or the opening is too close to the corner. The distance between the opening and the pole column adjacent to the opening is 6 - 250 mm, and can be, for example, 6 mm, 10 mm, 20 mm, 50 mm, 80 mm, 100 mm, 120 mm, 150 mm, 180 mm, 200 mm or 250 mm or any value between any two of the above values. The opening cannot be too close to the pole column. If it is too close to the pole column, it is easy to cause the pole column to be at high temperature and the insulating coating to be easily melted, nor can it be too far, otherwise the heat of the pole column cannot be dissipated quickly and sufficiently.

[0033] In one embodiment, the insulating coating covers all the openings to increase the insulation performance of the cover plate.

[0034] In one embodiment, the insulating coating covers all the openings, and the covering area of the insulating coating exceeds the edge line of the opening and partially overlaps with the coating film to increase the insulation performance of the cover plate.

[0035] In one embodiment, the insulating coating partially overlaps with the coating film, and the coating film is located below the insulating coating. First, the coating film is coated on part of the surfaces of the housing and the cover plate, and then the insulating coating is applied at the opening. The insulating coating can play a role in pressing the edge of the coating film to prevent the edge of the coating film from warping.

[0036] In one embodiment, the insulating coating and the covering film partially overlap, and the covering film is located above the insulating coating. The insulating coating is applied at the opening position first, and then the covering film is wrapped. When the insulating coating is applied, there may be some areas where the coating is not good. The covering film is wrapped on the insulating coating to increase the insulation effect.

[0037] In one embodiment, the thickness ratio of the insulating coating to the covering film is 0.01 - 3. Exemplarily, it can be 0.01, 0.1, 0.5, 0.8, 1.0, 1.2, 1.5, 2.0, 2.5, 3 or a value between any two of the above values. The above ratio cannot be too large. If it is too large, the insulating coating is too thick, and after the pressure strip is connected, the overall height increases. The ratio cannot be too small either. After the insulating top plate is placed on the cover plate surface, the gap between the covering film and the insulating coating is likely to let things in. If it falls to the position of the terminal post, it may cause a short circuit.

[0038] In one embodiment, the covering film has an overlapping area at the corner position of the cover plate. The ratio of the thickness of the insulating coating to the thickness of the overlapping area satisfies 0.003 - 1. Exemplarily, it can be 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 a value between any two of the above values. The corner position is the position where two adjacent side plates of the cover plate intersect. When the covering film is set, after the covering film is folded to the cover plate surface, there will be an overlapping area at the corner position. The number of layers of the covering film in the overlapping area is at least two. If the thickness of the overlapping area is too thick, it will affect heat dissipation. The thickness of the insulating coating is less than the thickness of the overlapping area, which can improve the heat dissipation ability of the cover plate.

[0039] In one embodiment, the range of the area of the overlapping area / the area of the insulating coating is 0.0008 - 3. Exemplarily, it can be 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 a value between any two of the above values. The larger the area of the overlapping area, the slightly larger the area of the insulating coating can be set to increase heat dissipation, thereby improving the overall heat dissipation ability of the cover plate.

[0040] In one embodiment, at least part of the insulating coating coincides 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 the insulation performance at the corner.

[0041] In one embodiment, along the length direction of the cover plate, the insulating top plate and the insulating coating partially overlap.

[0042] In one embodiment, the ratio of the total area of the insulating coating to the cover plate satisfies 0.005 - 0.4. Exemplarily, it can be 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 value between any two of the above values. If this ratio is too small, it means the area of the insulating coating is relatively small, the fast heat dissipation area decreases, which is not conducive to the heat dissipation of the cover plate. If this ratio is too large, it means the proportion of the area of the insulating coating is too large, the area of the insulating top plate will decrease, which is not conducive to improving the insulation between the battery and the bus bar.

[0043] In one embodiment, the pole column assembly includes at least two pole columns, namely the positive pole column and the negative pole column. The area S1 of the pole column, the thickness h of the pole column, the area S0 of the insulating coating, and the thickness d1 of the insulating coating satisfy: S1 * h * (S0 / d1) satisfies the range of 0.15 - 260000. Exemplarily, it can be 0.15, 1, 5, 10, 100, 500, 1000, 5000, 10000, 50000, 100000, 200000, 260000 or any value between any two of the above values. Among them, the unit of the area S1 of the pole column is mm 2 , the unit of the thickness h of the pole column is mm, and the unit of the area S0 of the insulating coating is mm 2 . The smaller the area of the pole column and the smaller the height of the pole column, the smaller the current-carrying area of the pole column, and the heat generation will increase. At this time, the area of the insulating coating needs to be set larger and the thickness of the insulating coating needs to be thinner. Among them, the area of the pole column is the area of the end face of the pole column far from the battery cell, and the thickness of the pole column is the distance between the end face of the pole column close to the battery cell and the end face far from the battery cell.

[0044] In one embodiment, the battery includes a battery cell. The battery cell includes a battery cell body and a tab. The tab is electrically connected to the pole column assembly. Among them, the tab and the pole column can be directly connected or indirectly connected, such as indirectly connected by using an adapter plate. The total thickness of the tab, the thickness of the pole column, and the thickness of the insulating coating satisfy the following relationship: the total thickness of the tab * the thickness of the pole column / the thickness of the insulating coating satisfies 0.75 - 12000. Among them, the units of the thickness of the pole column, the total thickness of the tab, and the thickness of the insulating coating are mm.

[0045] Exemplarily, it can be 0.75, 1, 10, 100, 500, 1000, 5000, 10000, 12000 or any value between any two of the above values. The total thickness of the tab is the thickness of a single-layer tab in the battery cell * the total number of tab layers. The thinner the total thickness of the tab, the thinner the pole column should be set accordingly. The current-carrying area is poor and the heat generation will increase. At this time, the thickness of the insulating coating needs to be smaller to improve heat dissipation.

[0046] In an alternative embodiment, along the length direction of the cover plate, the distance between the insulating coating and the adjacent pole column is 2 - 300 mm. The distance between the insulating coating and the pole column 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 value between any two of the above values. Controlling the distance between the insulating coating and the pole column within the above range can effectively control the proportion of the insulating coating, avoiding the situation that the distance between the insulating coating and the pole column is too far to utilize the insulating coating to quickly transfer the heat of the pole column part outward, and can also prevent the distance between the insulating coating and the pole column from being too small, where the heat of the pole column melts the insulating coating and damages the performance of the insulating coating.

[0047] In an alternative embodiment, along the length direction of the cover plate, the insulating top plate and the insulating coating partially overlap to improve the overall insulation performance of the cover plate.

[0048] Based on the same technical purpose, the embodiment of the present application also provides a battery pack. Figure 3 It is a schematic structural diagram of a battery pack. As Figure 3 shown, the battery pack includes a plurality of batteries 01 of the present application. Among them, the plurality of batteries are arranged along the width direction of the battery, and the width direction of the battery is the same as the width direction of the cover plate, that is, the direction perpendicular to the large surface of the battery. In the embodiment of the present application, with reference to Figure 1 , the housing 10 includes four side surfaces and a bottom surface. Among the four side surfaces, there are two relatively arranged first side surfaces 111 and two relatively arranged second side surfaces 112. The area of the first side surface 111 is larger than the area of the second side surface 112. That is, the first side surface 111 is the large surface of the battery, and the second side surface 112 is the small surface of the battery.

[0049] In one embodiment, with reference to Figure 3 , the battery pack further includes a pressing strip 02. In the arrangement direction of at least two batteries, the pressing strip 02 is bonded to the insulating coating and connects at least two batteries 01.

[0050] Among them, in one embodiment, the extending direction of the pressing strip is perpendicular to the length direction of the battery. The pressing strip is used to connect a plurality of batteries to ensure the connection stability between the batteries and avoid the situation that the plurality of batteries move during transportation or use. Compared with the case of bonding with a traditional wrapping film, the bonding strength between the insulating coating and the pressing strip is greater. By bonding the pressing strip to the insulating coating, the connection reliability between the pressing strip and the cover plate can be ensured, and further the connection stability between the plurality of batteries can be ensured.

[0051] Among them, the thickness of the pressure strip * the thickness of the insulating coating is 0.0002 - 0.6, and exemplarily, it can be 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 a value between any two of the above values. Among them, the unit of the thickness of the pressure strip is mm, and the unit of the thickness of the insulating coating is mm. When the thickness of the pressure strip is set to be relatively thick, the insulating coating can be set to be thinner to avoid increasing the overall height of the battery pack. In addition, when the thickness of the pressure strip is set to be relatively thin, when bonding the pressure strip, the adhesive layer between the insulating coating and the pressure strip can be set to be thicker to increase the bonding strength.

[0052] In one embodiment, the width of the pressure strip / the width of the insulating coating is 0.5 - 10, and exemplarily, it can be 0.5, 1.0, 1.5, 2.0, 2.5, 3, 4, 5, 6, 7, 8, 9 or 10 or a value between any two of the above values. The width of the insulating coating is the dimension of the insulating coating along the length direction of the cover plate. The width direction of the pressure strip is the dimension of the pressure strip along the length direction of the cover plate. The above ratio can ensure sufficient contact between the pressure strip and the insulating coating and ensure the connection strength.

[0053] In one embodiment, the number of openings is two, and the two openings are centrosymmetric. The openings are arranged in a centrosymmetric manner, and the center is the center of the surface of the battery for connecting the cover plate, which can facilitate the connection of the pressure strip and the cover plate, and the cover plate can also be connected by rotating 180°.

[0054] In one embodiment, along the length direction of the cover plate, the distance between the pressure strip and the edge of the battery is 0 - 30 mm, and exemplarily, it is 0.1 mm, 0.5 mm, 1 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, or a value between any two of the above values, to avoid the pressure strip exceeding the edge of the battery and increasing the lateral dimension of the battery. This distance cannot be too large. If it is too large, the pressure strip occupies the positions of other structures of the battery, affecting the setting of the pole column assembly, etc. The pole column needs to be set closer to the center of the battery, and the electron transmission path of the electrode tab at the edge of the battery core increases, resulting in easy lithium deposition at the edge of the electrode tab. When the above distance is 0, the pressure strip and the battery edge are aligned, or the pressure strip may also exceed the battery edge, and both of the above situations should be understood as the situation equal to 0.

[0055] In one embodiment, along the length direction of the cover plate, the distance between the pressing strip and the adjacent pole column is 0 - 50 mm, exemplarily 0.1 mm, 0.5 mm, 1 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm or any value between any two of the above values. If the distance between the pressing strip and the pole column assembly is too far, the pole column needs to be set towards the center, increasing the electron transmission path of the electrode tab at the edge of the battery cell, resulting in easy lithium deposition at the edge of the electrode tab. Or if the pressing 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.

[0056] In one embodiment, the bonding area of the pressing strip and the insulating coating / the area of the insulating coating is 0.5 - 1.5, exemplarily it can be 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5 or any value between any two of the above values. Controlling the bonding area of the pressing strip within the above ratio range can make the connection between the pressing strip and the insulating coating more stable.

[0057] In one embodiment, along the arrangement direction of multiple battery cells, the openings between adjacent battery cells are arranged oppositely, and at least two adjacent battery cells are bonded to the same pressing strip. The openings on the same side of the battery cells can be crimped with the same pressing strip, which is convenient for assembly.

[0058] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these changes and modifications.

Claims

1. A battery, characterized in that, It includes a housing and a cover plate. The cover plate includes a cover plate body and a terminal 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 is provided with an opening, and the opening is correspondingly arranged with respect to the cover plate to form a region exposing a part of the cover plate body. An insulating coating covers at least a part of the opening, and the thickness of the insulating coating is less than the thickness of at least a part of the insulating film layer.

2. The battery according to claim 1, wherein The insulating film layer includes a coating film and an insulating top plate.

3. The battery according to claim 2, characterized in that, The coating 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 coating film overlap at the edge of the long side of the cover plate, and do not overlap in the middle region.

4. The battery according to claim 2, wherein, The ratio of the thickness of the insulating coating to the thickness of the insulating top plate satisfies 0.005 - 0.

95.

5. The battery according to claim 2, wherein, Along the length direction 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 coating film and the insulating top plate.

6. The battery according to claim 5, characterized in that, The terminal assembly includes a positive terminal and a negative terminal. There are two openings. Each opening is formed by surrounding the coating film and the insulating top plate. One opening is disposed between the positive terminal and the edge of the cover plate adjacent to the positive terminal, and the other opening is disposed between the negative terminal and the edge of the cover plate adjacent to the negative terminal.

7. The battery according to claim 2, characterized in that, The gap between the coating film and the insulating coating is greater than or equal to 0 and less than or equal to 1 mm.

8. The battery according to any one of claims 2-7, characterized in that, The opening is provided on the insulating top plate.

9. The battery according to any one of claims 2-7, characterized in that, Along the length direction of the cover plate, the distance between the opening and the edge of the cover plate adjacent to the opening satisfies 0.5 - 10 mm; and / or, along the length direction of the cover plate, the distance between the side of the opening away from the insulating top plate and the insulating top plate is 5 - 50 mm; and / or, along the length direction of the cover plate, the distance between the opening and the terminal adjacent to the opening is 6 - 250 mm.

10. The battery according to any one of claims 2-7, characterized in that, The insulating coating covers all the openings.

11. The battery according to any one of claims 2-7, characterized in that, The insulating coating covers all the openings and partially overlaps with the coating film.

12. The battery according to claim 11, characterized in that, The insulating coating partially overlaps with the coating film, and the coating film is located below the insulating coating.

13. The battery according to claim 11, characterized in that, The insulating coating partially overlaps with the coating film, and the coating film is located above the insulating coating.

14. The battery according to any one of claims 2-7, characterized in that, The thickness relationship between the insulating coating and the coating film is 0.01 - 3.

15. The battery according to any one of claims 2-7, characterized in that, The coating film has an overlapping area at the corner of the cover plate, and the ratio of the thickness of the insulating coating to the thickness of the overlapping area satisfies 0.003 - 1.

16. The battery according to any one of claims 2-7, characterized in that, The coating film has an overlapping area at the corner of the cover plate, and the range of the area of the overlapping area / the area of the insulating coating is 0.0008 - 3.

17. The battery according to any one of claims 2-7, characterized in that, The coating film has an overlapping area at the corner of the cover plate, and the insulating coating at least partially coincides with the overlapping area.

18. The battery according to any one of claims 2-7, characterized in that, Along the length direction of the cover plate, the insulating top plate and the insulating coating partially overlap.

19. The battery according to any one of claims 1-7, characterized in that, The ratio of the area of the insulating coating to the total area of the cover plate satisfies 0.005 - 0.

4.

20. The battery according to any one of claims 1-7, characterized in that, The pole column assembly includes at least two pole columns, namely a positive pole column and a negative pole column. The area S1 of the pole column, the thickness h of the pole column, the area S0 of the insulating coating, and the thickness d1 of the insulating coating satisfy that S1*h*(S0 / d1) satisfies the range of 0.15 to 260,000; Among them, the unit of the area S1 of the terminal post is mm 2 , the unit of the thickness h of the terminal post is mm, and the unit of the area S0 of the insulating coating is mm 2 .

21. The battery according to any one of claims 1-7, characterized in that, The battery includes an electric core, the electric core includes an electric core body and pole tabs, the pole tabs are electrically connected to the pole column assembly, and the total thickness of the pole tabs, the thickness of the pole column, and the thickness of the insulating coating satisfy the following relationship: the total thickness of the pole tabs * the thickness of the pole column / the thickness of the insulating coating satisfies 0.75 to 12,000; Wherein, the units of the thickness of the pole column, the total thickness of the pole tabs, and the thickness of the insulating coating are all mm.

22. A battery pack, characterized in that, It includes at least two batteries as described in any one of claims 1-21, and the at least two batteries are arranged along the width direction of the battery.

23. The battery pack according to claim 22, characterized in that, The battery pack further includes a pressing strip. In the arrangement direction of the at least two batteries, the pressing strip is bonded to the insulating coating and connects at least two of the batteries; The thickness of the pressing strip * the thickness of the insulating coating is 0.0002-0.6, wherein the unit of the thickness of the pressing strip is mm and the unit of the thickness of the insulating coating is mm.

24. The battery pack according to claim 23, characterized in that, The width of the pressing strip / the width of the insulating coating is 0.5-10. The width of the insulating coating is the dimension of the insulating coating along the length direction of the cover plate, and the width direction of the pressing strip is the dimension of the pressing strip along the length direction of the cover plate.

25. The battery pack according to claim 23, wherein, The number of the openings is two, and the two openings are centrosymmetric.

26. The battery pack according to any one of claims 23-25, characterized in that, Along the length direction of the cover plate, the distance between the pressing strip and the edge of the battery is 0-30 mm.

27. The battery pack according to any one of claims 23-25, characterized in that, Along the length direction of the cover plate, the distance between the pressing strip and the adjacent pole column is 0-50 mm.

28. The battery pack according to any one of claims 23-25, characterized in that, The bonding area of the pressing strip and the insulating coating / the area of the insulating coating is 0.5-1.

5.

29. The battery pack according to any one of claims 23-25, characterized in that, Along the arrangement direction of the multiple batteries, the openings between adjacent batteries are arranged oppositely, and at least two adjacent batteries are bonded to the same pressing strip.

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