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 shell is provided with an opening, and the cover plate covers the opening of the shell and forms an accommodating cavity with the shell; a first insulating coating is arranged on the outer surface of the shell; an insulating plate laminated with the cover plate is arranged on the outer surface of the cover plate; the length of the insulating plate is smaller than that of the cover plate in the length direction of the cover plate, a hollow area exists between the insulating plate and the edge of the cover plate, a second insulating coating is arranged on part of the surface of the cover plate, and the second insulating coating is arranged in the hollow area; the thickness of the second insulating coating is smaller than that of the insulating plate. The battery can help to reduce the height of the battery pack and improve the connection strength of the connecting piece.

Description

Technical Field

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

[0002] Existing commercial batteries generally include a housing and a cover plate. Structures such as a liquid injection port and a terminal post are usually provided on the cover plate, resulting in an uneven surface of the cover plate. When assembling a battery pack, components such as busbars are used to connect different batteries. To prevent short circuits between the cover plate and components such as busbars, an insulating plate is usually provided on the surface of the cover plate. At the same time, when assembling a battery pack, to ensure that the batteries do not move, a connecting plate is provided at the edge of the battery. If the connecting plate is connected to the surface of the insulating plate, the overall height of the battery pack will increase, and the connection strength between the connecting plate and the insulating plate cannot be guaranteed. Summary of the Utility Model

[0003] This application discloses a battery and a battery pack for reducing the height of the battery pack and improving the connection strength of the connecting member.

[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 housing and a cover plate. The housing is provided with an opening, and the cover plate covers the opening of the housing and forms a receiving cavity with the housing;

[0006] A first insulating coating is provided on the outer surface of the housing;

[0007] An insulating plate stacked with the cover plate is provided on the outer surface of the cover plate;

[0008] Along the length direction of the cover plate, the length of the insulating plate is less than the length of the cover plate, and there is a hollowed-out area between the edge of the insulating plate and the cover plate. A second insulating coating is provided on a part of the surface of the cover plate, and the second insulating coating is provided in the hollowed-out area; the thickness of the second insulating coating is less than the thickness of the insulating plate.

[0009] For the battery of the present application, a first insulating coating is provided on the outer surface of the housing, and the first insulating coating is used to achieve insulation between batteries. The length of the insulating plate is less than the length of the cover plate. A hollowed-out area can be provided at the end of the cover plate, and a second insulating coating is provided in the hollowed-out area. The second insulating coating is used for bonding with the connecting member. Since the thickness of the second insulating coating is less than the thickness of the insulating plate, compared with the case where the connecting member is bonded to the insulating plate, bonding the connecting member to the second insulating coating can help reduce the overall height of the battery pack. Moreover, when the second insulating coating is bonded to the connecting member, the thickness of the connecting member can be increased, which helps to improve the strength of the connecting member. Alternatively, without increasing the thickness of the connecting member, the thickness of the bonding layer between the second insulating coating and the connecting member can be increased, thereby increasing the bonding strength between the cover plate and the connecting member.

[0010] In a second aspect, the present application provides a battery pack, which includes a plurality of batteries of the present application and a connecting member. The plurality of batteries are arranged along the width direction of the battery. The connecting member connects at least some of the batteries, and the connecting member is bonded to the second insulating coating.

[0011] For the battery pack of the present application, the connecting member is bonded to the second insulating coating that is not blocked by the insulating plate in the hollowed-out area, and can be pressed on the surface of the battery, avoiding the battery pack from moving due to vibration during subsequent use or transportation. Since the thickness of the second insulating coating used for connecting with the connecting member is less than the thickness of the insulating plate, compared with the traditional battery pack connected to the insulating plate, the overall height of the battery pack can be reduced, and it helps to improve the connection strength between the connecting member and the battery in the battery pack. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of a battery provided by an embodiment of the present application;

[0013] Figure 2 It is a schematic surface structural diagram of a cover plate provided by an embodiment of the present application;

[0014] Figure 3 It is a schematic structural diagram of a battery pack provided by an embodiment of the present application;

[0015] Figure 4 It is a schematic structural diagram of a battery pack provided by an embodiment of the present application.

[0016] Reference Numerals in the Drawings:

[0017] 01 - Battery; 10 - Housing; 11 - First Insulating Coating; 111 - First Side; 112 - Second Side;

[0018] 20 - Cover Plate; 21 - Terminal Post; 22 - Pressure Relief Mechanism; 23 - Hollowed - out Area; 24 - Second Insulating Coating;

[0019] 30 - Insulating plate; 02 - Connecting piece; 03 - Heat exchange component. Specific embodiments

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to 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.

[0021] The present application provides a first insulating coating on the outer surface of the housing to improve the insulation of the battery, and a second insulating coating that is not covered by the insulating plate is provided at the cover plate to bond with the connecting piece, which is beneficial to reducing the overall height of the battery pack while ensuring the insulation of the cover plate. The structure of the battery of the present application will be further described in detail below with reference to the accompanying drawings.

[0022] Figure 1 It is a schematic structural diagram of a battery. As Figure 1 shown, the battery includes a housing 01, a battery cell (not shown in the figure), and a cover plate 20. The housing 10 is provided with an opening, and the cover plate 20 is covered at the opening to form a receiving cavity. The battery cell is disposed in the receiving cavity. The battery cell can be a stacked cell or a wound cell. Among them, the stacked cell includes a positive electrode sheet, a negative electrode sheet, and a separator stacked. The separator is disposed between the positive electrode sheet and the negative electrode sheet. The wound cell is formed by winding a positive electrode sheet, a separator, and a negative electrode sheet.

[0023] 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 Figure 1 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 Figure 1 the y direction shown in

[0024] Refer to Figure 1, the housing of the battery 10 is a metal housing, such as a stainless steel housing, an aluminum alloy housing, a carbon steel housing, etc. In the embodiment of the present application, the housing of the battery 10 is an aluminum alloy housing. To avoid short - circuit between batteries, a first insulating coating 11 is provided on the outer surface of the housing 10. The outer surface of the housing 10 is the surface facing away from the battery core, and the inner surface of the housing is the surface facing the battery core. The first insulating coating 11 can be formed by spraying, coating, brushing, electrophoresis, or other methods. Through the above methods, the first insulating coating 11 can be formed more evenly on the outer surface of the housing, and a high - strength connection between the first insulating coating 11 and the housing 10 can be achieved. After spraying, coating, or brushing the slurry, the slurry can be cured by light or heating to form the first insulating coating 11. The first insulating coating 11 can include, for example, resin - based materials. As an illustrative example, the first insulating coating 11 can be a polyethylene coating, a polyurethane coating, an epoxy resin coating, a potassium silicate coating, a silicone coating, etc.

[0025] The cover plate of the battery can be a metal cover plate, such as an aluminum alloy cover plate, a stainless steel cover plate, or a carbon steel cover plate, etc. In the embodiment of the present application, the cover plate is an aluminum alloy cover plate. As Figure 1 shown, the cover plate 21 can include a cover plate body. A pole post 21 can be provided on the cover plate body, and a pressure relief mechanism 22, a liquid injection hole (not shown in the figure), and other structures can also be provided. Along the thickness direction of the cover plate 21, the cover plate 21 includes two relatively arranged surfaces. The surface facing away from the battery core is the outer surface of the cover plate, and the surface facing the battery core is the inner surface of the cover plate. The insulating plate 30 is stacked with the cover plate 20, and through - holes are provided at positions corresponding to the pole post 21, the pressure relief mechanism 22, and the liquid injection hole to expose the above - mentioned structures. The insulating plate 30 can be a polyurethane plate, a polyethylene terephthalate plate, or the like.

[0026] Figure 2 It is a schematic diagram of the surface structure of a cover plate of an embodiment. As Figure 2 shown, in the embodiment of the present application, along the length direction of the cover plate 20, the length of the insulating plate 30 is less than the length of the cover plate. There is a hollowed - out area 23 between the edge of the insulating plate 30 and the cover plate 20. A second insulating coating 24 is provided on a part of the surface of the cover plate 20, and the second insulating coating 24 is provided in the hollowed - out area 23; the thickness of the second insulating coating 24 is less than the thickness of the insulating plate.

[0027] The second insulating coating is used for bonding with the connecting member. Since the thickness of the second insulating coating is less than that of the insulating plate, compared with the case where the connecting member is bonded to the insulating plate, bonding the connecting member to the second insulating coating can help reduce the overall height of the battery pack. Moreover, when the second insulating coating is bonded to the connecting member, without increasing the overall height of the battery, the thickness of the connecting member can be increased, thus helping to improve the strength of the connecting member. Or, without increasing the thickness of the connecting member, the thickness of the bonding layer between the second insulating coating and the connecting member can be increased, thereby increasing the bonding strength between the cover plate and the connecting member.

[0028] In one embodiment, along the width direction of the cover plate, the second insulating coating penetrates to the edge of the cover plate. The second insulating coating penetrates to the edge of the cover plate in the width direction of the cover plate, thereby maximizing the size of the second insulating coating in the width direction of the cover plate, helping to increase the bonding area between the second insulating coating and the connecting member, and further improving the connection strength between the second insulating coating and the connecting member.

[0029] Among them, the first insulating coating and the second insulating coating are joined and can be an integrally sprayed structure to form an integral structure of the first insulating coating and the second insulating coating, so as to avoid leakage of electricity at the connection between the housing and the cover plate. The second insulating coating is sprayed after the first insulating coating is formed. Among them, during the spraying process, after the first insulating coating is formed, the spraying of the second insulating coating is achieved by adjusting the angle and spraying amount of the nozzle, which is convenient for operation.

[0030] As Figure 1 shown in the structure, the outer surface of the housing includes four side surfaces and a bottom surface. The bottom surface is the surface of the housing opposite to the cover plate. The four side surfaces are located between the cover plate and the bottom surface. Among them, there are two relatively arranged first side surfaces 111 and two relatively arranged second side surfaces 112 among the four side surfaces. The area of the first side surface 111 is larger than that 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. When spraying the first insulating coating and the second insulating coating, the first insulating coating can be sprayed on the outer surfaces of the four side surfaces and the bottom surface, and the first insulating coating extends to the opening edge of the housing, and the second insulating coating is sprayed on the end surface of the cover plate.

[0031] In one embodiment, the second insulating coating is in contact with or partially overlaps the projection of the insulating plate on the cover plate. When the second insulating coating partially overlaps the projection of the insulating plate on the cover plate, along the length direction of the cover plate, the width of the overlapping area is greater than 0 and less than or equal to 30 mm. Exemplarily, the width of the overlapping area can be, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 12 mm, 15 mm, 17 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm or any value between any two of the above values. When the width of the overlapping area between the second insulating coating and the insulating plate is too small or there is no overlapping area, during battery transportation, it may come into conductive contact, thus increasing the risk of battery short circuit. When the width of the overlapping area between the second insulating coating and the insulating plate is too large, it will affect the heat dissipation of the cover plate and reduce the heat dissipation capacity of the cover plate.

[0032] In one embodiment, the area S1 of the second insulating coating not covered by the insulating plate accounts for 0.5 - 20% of the surface area S0 of the cover plate. Exemplarily, the ratio of S1 to S0 can be, for example, 0.5%, 1%, 1.5%, 3%, 5%, 8%, 10%, 11%, 12%, 15%, 17%, 18%, 20% or any value between any two of the above values.

[0033] The part of the second insulating coating not covered by the insulating plate is used for bonding with the connecting piece. The connecting piece can be used to bond to the surface of the battery through the second insulating coating to prevent the battery from moving during transportation. If the proportion of the area of the second insulating coating not covered by the insulating plate is too small, it will cause the bonding area with the connecting piece to become smaller and the connection reliability to be low. If the area proportion of S1 is too large, it will cause the distance from the pole column to decrease. During the spraying process of the second insulating coating, it is easy to spray onto the pole column, affecting the electrical conductivity of the pole column. In addition, during the operation of the battery, more heat is generated at the pole column. If the area proportion of S1 is relatively large, it will affect the safety of the second insulating coating. For example, when the temperature of the pole column is too high, it will increase the risk of melting of the second insulating coating.

[0034] In one embodiment, along the length direction of the cover plate, the width of the second insulating coating is 1 - 20 mm. Exemplarily, the width of the second insulating coating can be, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 12 mm, 15 mm, 17 mm, 20 mm or any value between any two of the above values. The width of the second insulating coating cannot be too large, otherwise the distance from other structural components, such as the pole column and the pressure relief port, is too small, affecting the performance of the pole column and the pressure relief port. The width of the second insulating coating cannot be too small either, otherwise the spraying process is not easy to control, increasing the difficulty of the spraying process.

[0035] In one embodiment, along the length direction of the cover plate, the distance between the second insulating coating and the pressure relief area of the cover plate is 2 - 80 mm, and the distance between the second insulating coating and the liquid injection port of the cover plate is 20 - 150 mm. Exemplarily, the distance between the second insulating coating and the pressure relief area can be, for example, 2 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 17 mm, 20 mm, 22 mm, 25 mm, 28 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm or any value between any two of the above values. The distance between the liquid injection ports of the cover plate can be, for example, 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 or any value between any two of the above values.

[0036] The pressure relief area is the area on the cover plate where the pressure relief mechanism is provided. When the pressure relief mechanism is a pressure relief port, the pressure relief area is the area enclosed by the edge line of the pressure relief port. When the pressure relief mechanism is an explosion-proof film, the area enclosed by the outer edge line of the explosion-proof film is the pressure relief area. When the pressure relief mechanism is a weak structure formed by stamping or scoring in a local area of the cover plate, the area enclosed by the weak structure is the pressure relief area.

[0037] The liquid injection hole is a through hole formed on the cover plate for introducing electrolyte, and it will be sealed after the liquid injection is completed. The liquid injection port is the opening of the liquid injection hole of the cover plate on the surface of the cover plate.

[0038] Maintaining the distance between the second insulating coating and the pressure relief area and between the second insulating coating and the liquid injection port within the above range can prevent the spraying process from spraying onto the pressure relief area and the liquid injection port and blocking the pressure relief area and the liquid injection port. The coating blocking the pressure relief area affects the pressure relief when the battery has a thermal runaway. The coating blocking the liquid injection hole affects the liquid injection, and the electrolyte will cause the coating to be corroded.

[0039] In one embodiment, the battery further includes a battery cell, and the product of the thickness d1 of the second insulating coating and the thickness d2 of the battery cell is less than or equal to 0.06 - 24. The unit of the thickness of the first insulating coating is mm, and the unit of the thickness of the battery cell is mm. Exemplarily, the product of d1 and d2 can be, for example, 0.06, 0.1, 1, 2, 5, 8, 10, 12, 14, 16, 18, 20, 22, 24 or any value between any two of the above values.

[0040] The greater the thickness of the battery cell, the more the battery expands during charge and discharge, and the greater the risk of crosstalk between batteries. At this time, setting the thickness of the second insulating coating smaller can increase the thickness of the connecting piece to increase the strength of the connecting piece, or when bonding the second insulating coating and the connecting piece, the thickness of the bonding layer can be increased, thereby increasing the connection strength between the connecting piece and the battery.

[0041] In one embodiment, the ratio of the thickness d2 of the battery cell to the total area S of all the second insulating coatings 总 is 1 / 320 - 8 / 5. Exemplarily, the ratio of d2 to S 总 can be, for example, 1 / 320, 1 / 300, 1 / 250, 1 / 200, 1 / 150, 1 / 120, 1 / 100, 1 / 80, 1 / 50, 1 / 20, 1 / 10, 1 / 8, 1 / 5, 2 / 5, 3 / 5, 4 / 5, 5 / 5, 6 / 5, 7 / 5, 8 / 5 or any value between any two of the above values. The larger the thickness of the battery cell, the more the battery expands during charge and discharge, and the higher the risk of crosstalk between batteries. Increasing the area of the second insulating coating can increase the bonding area with the subsequent connecting member and improve the stability of the battery.

[0042] In summary, for the battery of the embodiment of the present application, a first insulating coating is provided on the outer surface of the housing, and the first insulating coating is used to achieve insulation between batteries. An insulating plate is provided on the surface of the cover plate, and the insulating plate is used to achieve insulating connection between the cover plate and other components, such as the bus bar. The length of the insulating plate is less than the length of the cover plate, and a second insulating coating can be provided at the end of the cover plate, and at least part of the second insulating coating may not be blocked by the insulating plate, so that the second insulating coating not blocked by the insulating plate is bonded to the connecting member. Among them, the first insulating coating and the second insulating coating intersect and can be an integrally sprayed structure to avoid leakage at the joint of the housing and the cover plate. The second insulating coating and the projection of the insulating plate on the cover plate are connected or partially overlapped to ensure the insulation of the cover plate. When connecting multiple batteries, the connecting member can be arranged at the second insulating coating not blocked by the insulating plate and connected to the second insulating coating to improve the connection strength between the connecting member and the cover plate.

[0043] Based on the same technical purpose, the embodiment of the present application also provides a battery pack. Figure 3 A structural schematic diagram of a battery pack. As Figure 3 shown, the battery pack includes a plurality of batteries 01 of the present application and a connecting member 02. Among them, the plurality of batteries are arranged in the width direction of the battery, and the width direction of the battery is the direction perpendicular to the large surface of the battery. The connecting member 02 connects at least some of the batteries, and the connecting member is bonded to the second insulating coating.

[0044] The connecting member is connected to the second insulating coating not shielded by the insulating plate and can be pressed on the surface of the battery to prevent the subsequent battery pack from moving due to vibration during use or transportation. The connecting member needs to have insulating properties and will not conduct electricity with the cover plate after being connected to the second insulating coating. The connecting member can be a strip-shaped connecting plate, and each connecting member can press all the batteries in the battery pack at the same time. Among them, the number of connecting members can be one, two, or multiple. The specific formation of the connecting member is not limited and can be designed according to actual design requirements. It can be understood that in the battery pack, the second insulating coatings on the same side of each battery can be pressed by the same connecting member.

[0045] It can be understood that in the battery pack according to the embodiment of the present application, in addition to the battery and the connecting member, a bus bar may also be included. The bus bar connects the pole columns of different batteries to achieve series-parallel connection between multiple batteries.

[0046] In one embodiment, the bus bar is connected to the pole column of the battery, and the surface of the connecting member facing away from the battery does not exceed the surface of the bus bar facing away from the battery. The surface of the connecting member does not exceed the surface of the bus bar, which can prevent the overall height of the battery pack from increasing. Under this condition, the thickness of the second insulating coating, the thickness of the connecting member, and the thickness of the bonding layer between the second insulating coating and the connecting member can be freely set as long as the surface of the connecting member does not exceed the surface of the bus bar.

[0047] In one embodiment, along the length direction of the cover plate, the ratio of the width of the connecting member to the width of the second insulating coating is 2-3. If the ratio is too large or too small, the relative area difference between the two will be large, the connection area will be small, and the connection strength between the connecting member and the cover plate will be affected. If the ratio is too small and the width of the connecting member is too small, the pressing effect of the connecting member will be affected, and the effect of reducing the movement of the battery will be reduced.

[0048] In one embodiment, the battery pack further includes a bus bar, the bus bar is connected to the pole columns of multiple batteries, and the surface of the connecting member on the side away from the battery does not exceed the surface of the bus bar on the side away from the battery. In this structure, the thickness of the connecting member can be set thicker to improve the strength of the connecting member. The bonding layer between the connecting member and the battery can also be set thicker to improve the bonding strength between the connecting member and the battery, as long as it does not exceed the surface of the bus bar, so as to reduce the occupied space of the battery in the box.

[0049] Figure 4 It is a schematic structural diagram of a battery pack according to an embodiment. As Figure 4As shown, in one embodiment, the battery pack further includes a heat exchange component 03. The housing of the battery includes two first sides and two second sides. The two first sides are arranged opposite to each other, and the two second sides are arranged opposite to each other. The area of the first side is larger than that of the second side. The heat exchange component 03 is disposed between the first sides of two adjacent batteries 01. The ratio of the area S1 of the second insulating coating not covered by the insulating plate to the surface area S0 of the cover plate is 1.5 - 20%. Exemplarily, the ratio of S1 to S0 can be, for example, 1.5%, 3%, 5%, 8%, 10%, 11%, 12%, 15%, 17%, 18%, 20%, or any value between any two of the above values.

[0050] The first side is the large face of the battery. The second side is the small face of the battery. The heat exchange component can be disposed between the large faces of two adjacent batteries. When a heat exchange component is disposed between the batteries, the heat dissipation effect of the battery increases. The larger the contact area between the heat dissipation component and the battery, the better the heat dissipation effect. When setting the connecting member, the connecting member can reduce the crosstalk of the battery to maintain the heat dissipation area of the heat exchange component and the battery. Therefore, S1 / S0 can be set relatively large.

[0051] Based on the same technical purpose, the embodiment of the present application provides an electrical device, which includes the battery or the battery pack of the present application. Among them, the electrical device of the embodiment of the present application includes, but is not limited to, various devices such as electric vehicles, new energy charging stations, and energy storage systems.

[0052] 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 housing is provided with an opening, and the cover plate covers the opening of the housing and forms a receiving cavity with the housing; The outer surface of the housing is provided with a first insulating coating; The outer surface of the cover plate is provided with an insulating plate laminated with the cover plate; Along the length direction of the cover plate, the length of the insulating plate is less than that of the cover plate, and there is a hollowed-out area between the edge of the insulating plate and the cover plate. A part of the surface of the cover plate is provided with a second insulating coating, and the second insulating coating is arranged in the hollowed-out area; the thickness of the second insulating coating is less than that of the insulating plate.

2. The battery according to claim 1, wherein Along the width direction of the cover plate, the second insulating coating extends to the edge of the cover plate.

3. The battery according to claim 1, characterized in that, The second insulating coating is connected or partially overlapped with the projection of the insulating plate on the cover plate; When the second insulating coating and the projection of the insulating plate on the cover plate are partially overlapped, along the length direction of the cover plate, the width of the overlapping area is greater than 0 and less than or equal to 10 mm.

4. The battery according to any one of claims 1 to 3, characterized in that, Along the length direction of the cover plate, the width of the second insulating coating is 1 - 50 mm.

5. The battery according to any one of claims 1-3, characterized in that, Along the length direction of the cover plate, the distance between the second insulating coating and the pressure relief area of the cover plate is 2 - 80 mm; the distance between the second insulating coating and the liquid injection port of the cover plate is 20 - 150 mm.

6. The battery according to any one of claims 1 to 3, characterized in that, The battery further includes a battery cell, and the ratio of the thickness d2 of the battery cell to the total area S of the second insulating coating 总 is 1 / 320 - 8 / 5.

7. A battery pack, characterized in that, It includes: A plurality of batteries as described in any one of claims 1 - 6, and the plurality of batteries are arranged along the width direction of the battery; A connecting piece, the connecting piece connects at least part of the batteries, and the connecting piece is bonded to the second insulating coating.

8. The battery pack according to claim 7, wherein, The battery pack further includes a bus bar, the bus bar is connected to the pole columns of the plurality of batteries, and the surface of the connecting piece away from the battery does not exceed the surface of the bus bar away from the battery.

9. The battery pack according to claim 7 or 8, characterized in that, The battery pack further includes a heat exchange component. The housing of the battery includes two first side surfaces and two second side surfaces. The two first side surfaces are arranged opposite to each other, and the two second side surfaces are arranged opposite to each other. The area of the first side surface is larger than that of the second side surface. The heat exchange component is arranged between the first side surfaces of adjacent two batteries, and the area S1 of the second insulating coating not covered by the insulating plate accounts for 1.5 - 20% of the surface area S0 of the cover plate.

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