Battery and battery pack

Abstract

The utility model relates to the field of batteries, and particularly discloses a battery and a battery pack. The battery comprises a shell and a cover plate, the shell is provided with an opening, and an insulating coating is arranged on the outer surface of the shell; the cover plate covers the opening of the shell and forms an accommodating cavity with the shell; the shell comprises a plurality of side faces, and a transition part is arranged between every two adjacent side faces. The outer surface of the cover plate is provided with an insulating top cover which is laminated with the cover plate, the length of the insulating top cover is smaller than that of the cover plate along the length direction of the cover plate, so that at least one end of the cover plate is provided with a blank area which is not covered by the insulating top cover, and the blank area extends to two opposite side surfaces of the shell and the transition part along the width direction of the cover plate. The structure is used for improving the insulation reliability and the heat dissipation performance of the battery.

Description

Technical Field

[0001] This application relates to the 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 wrapped around the outside of the battery case. Since this insulating film has a wrapped and bonded structure, it is prone to bonding gaps or detachment, resulting in the failure of the battery's insulation. To improve the reliability of the battery's insulation, an existing solution is to set an insulating coating on the outer surface of the battery case to replace the wrapped insulating film. The insulating coating can be formed on the surface of the case by spraying or coating. Compared with the structure of the wrapped film, the connection between the insulating coating and the case is tighter, and the insulation reliability can also be improved. However, after setting the insulating coating, it is necessary to comprehensively consider the insulation and heat dissipation at the cover plate of the battery. While minimizing the impact on the insulation of the cover plate and other batteries, the heat dissipation capacity at the cover plate should be improved to prevent excessive heat from accumulating at the cover plate. Summary of the Utility Model

[0003] This application discloses a battery and a battery pack for improving the insulation reliability and heat dissipation 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:

[0006] A case, the case is provided with an opening, and an insulating coating is provided on the outer surface of the case; the case includes a plurality of side surfaces, and a transition portion is provided between two adjacent side surfaces;

[0007] A cover plate, the cover plate is arranged at the opening of the case and forms a receiving cavity with the case;

[0008] An insulating top cover stacked with the cover plate is provided on the outer surface of the cover plate. Along the length direction of the cover plate, the length of the insulating top cover is less than the length of the cover plate so that at least one end of the cover plate is provided with a blank area not covered by the insulating top cover, and the blank area extends along the width direction of the cover plate to the two opposite side surfaces and the transition portion of the case.

[0009] For the battery of the present application, an insulating coating is provided on the outer surface of the housing, and the insulating coating is used to achieve insulation between batteries. The housing includes a plurality of side surfaces, and a transition portion is provided between two adjacent side surfaces. The heat generated by the battery core during charging and discharging is more likely to accumulate in the transition portion. In the present application, an insulating top cover is provided on the surface of the battery cover plate, and the length of the insulating top cover is less than the length of the cover plate, so that a blank area can be left at the end of the cover plate. The blank area extends in the width direction of the cover plate to the two opposite side surfaces and the transition portion of the housing. Thus, at the position of the cover plate corresponding to the transition portion, it is not covered by the insulating top cover, so as to improve the heat dissipation performance of the transition portion and prevent heat from accumulating in the transition portion.

[0010] In a second aspect, the present application provides a battery pack, which includes:

[0011] A plurality of batteries of the present application, and the plurality of batteries are stacked along the width direction of the battery;

[0012] A bus bar for connecting the pole columns of the plurality of batteries to form a series-parallel connection;

[0013] The distance between the blank area in the battery and the bus bar is 0.5 - 5 mm.

[0014] For the battery pack of the present application, a series-parallel connection structure can be realized between the plurality of batteries through the bus bar. Among them, the battery is the battery of the first aspect of the present application. Since the battery of the first aspect has the advantage of good heat dissipation performance at the transition portion of the housing, therefore, the battery pack of the present application also has the above advantages, so as to improve the overall safety of the battery pack. In addition, in the battery pack of the present application, since the blank area is the exposed cover plate and the cover plate is a conductive cover plate, the distance between the blank area and the bus bar needs to meet 0.5 - 5 mm to ensure a certain insulation between the blank area and the bus bar and avoid discharge between the two. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a battery provided by an embodiment of the present application;

[0016] Figure 2 It is a schematic organizational structure diagram of a battery;

[0017] Figure 3 It is a schematic top view structural diagram of a battery of an embodiment;

[0018] Figure 4 It is a schematic structural diagram of a battery of an embodiment;

[0019] Figure 5 It is a schematic structural diagram of a battery pack provided by an embodiment of the present application.

[0020] Reference Numerals in the Drawings:

[0021] 01 - Battery; 10 - Housing; 11 - Side; 111 - First Side; 112 - Second Side; 12 - Bottom Surface;

[0022] 13 - Transition Portion; 14 - Blank Area; 20 - Cover Plate; 21 - Terminal Post; 22 - Pressure Relief Mechanism; 30 - Insulating Top Cover; 31 - Top Cover Main Body; 32 - Flange; 02 - Connecting Member. Detailed Implementation Manner

[0023] 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. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0024] The heat dissipation and insulation of the battery are two major factors affecting the safety of the battery. The present application provides an insulating coating on the outer surface of the housing to improve the insulation of the battery, and a blank area that is not covered by the insulating top cover is provided at the cover plate to enhance the heat dissipation on the surface of the cover plate and prevent heat from accumulating at the corners of the battery, that is, the transition portion of the housing, thereby improving the insulation and heat dissipation of the battery. The structure of the battery in the present application will be further described in detail below in conjunction with the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of the disassembly structure of a battery. Figure 2 It is a schematic diagram of the organizational structure of a battery. As Figure 1 and Figure 2 shown, the battery includes a housing 10, an electrode assembly, 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 electrode assembly is disposed in the receiving cavity. The electrode assembly can be a stacked electrode assembly or a wound electrode assembly. Among them, the stacked electrode assembly 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 electrode assembly is formed by winding a positive electrode sheet, a separator, and a negative electrode sheet.

[0026] As Figure 1 and Figure 2 shown, the housing is a cuboid structure. The length direction of the cover plate 20 is the length direction of the housing 10, as shown in the x direction in Figure 1 . The width direction of the cover plate 20 is the width direction of the housing 10, as shown in the y direction in Figure 1 . The thickness direction of the cover plate 20 is the height direction of the housing 10, as shown in the z direction in Figure 1 .

[0027] The housing of the battery is a metal housing, for example, it can be a stainless steel housing, an aluminum alloy housing, a carbon steel housing, etc. In the embodiments of the present application, the housing of the battery is an aluminum alloy housing. To avoid short circuits between batteries, an insulating coating is provided on the outer surface of the housing. The outer surface of the housing is the surface facing away from the battery cell, and the inner surface of the housing is the surface facing the battery cell. The insulating coating can be formed by spraying, brushing, coating, or electrophoresis. By the above methods, the insulating coating can be formed more evenly on the outer surface of the housing, and a high-strength connection between the insulating coating and the housing can be achieved. After spraying, coating, or brushing the slurry, the slurry can be cured by light irradiation or heating to form the insulating coating. The insulating coating can be, for example, a resinous material. As an illustrative example, the insulating coating can be a polyethylene coating, a polyurethane coating, an epoxy resin coating, a potassium silicate coating, a silicone coating, etc.

[0028] The cover plate of the battery can be a metal cover plate, for example, it can be an aluminum alloy cover plate, a stainless steel cover plate, or a carbon steel cover plate, etc. In the embodiments of the present application, the cover plate is an aluminum alloy cover plate. Referring to Figure 1 , the cover plate 20 can include a cover plate body, and structures such as a terminal post 21 and an optional pressure relief mechanism can be provided on the cover plate body. To achieve insulation between the cover plate 20 and other components, an insulating top cover needs to be provided on the outer surface of the cover plate 20. Along the thickness direction of the cover plate 20, the cover plate 20 includes two relatively arranged surfaces. The surface facing away from the battery cell is the outer surface of the cover plate, and the surface facing the battery cell is the inner surface of the cover plate. The insulating top cover 30 is stacked with the cover plate 20, and through holes are provided at positions corresponding to the terminal post, the pressure relief mechanism, etc. to expose the above structures. The material of the insulating top cover 30 can be polyurethane, or polyethylene terephthalate, etc.

[0029] As Figure 1 and Figure 2 shown in the structure, the housing 10 includes a plurality of side surfaces, and a transition portion 13 is provided between two adjacent side surfaces. Along the length direction of the cover plate 20, the length of the insulating top cover 30 is less than the length of the cover plate 20 so that at least one end of the cover plate 20 has a blank area 14 not covered by the insulating top cover 30. The blank area 14 is used to expose the surface of the cover plate 20. The blank area 14 extends along the width direction of the cover plate 20 to the two opposite side surfaces of the housing and the transition portion 13.

[0030] In the embodiments of the present application, the housing 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 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. Wherein, the connection part between any two adjacent side surfaces can be regarded as a transition part 14. Exemplarily, the transition part 14 can be an arc transition part, and the connecting outer surface of two adjacent side surfaces is an arc surface. During the operation of the battery cell, the heat generated by it is likely to accumulate at the transition part. However, since an insulating coating needs to be provided on the side surface, if the entire surface of the cover plate is covered by the insulating top cover, the heat dissipation of the cover plate will be affected. Therefore, a certain blank area not blocked by the insulating top cover can be reserved at the cover plate to increase the heat dissipation of the transition part. To set a blank area at at least one end of the cover plate, along the length direction of the cover plate, the length of the insulating top cover is less than the length of the cover plate so that at least one end of the cover plate is not blocked by the insulating top cover.

[0031] In one embodiment, blank areas are provided at both ends of the cover plate. In the width direction of the cover plate, each blank area can extend to two relatively arranged side surfaces of the housing and the transition part, that is, each blank area can extend along the width direction of the cover plate to the two large surfaces of the battery and the edge line of the transition part, and intersect with the edge lines of the two large surfaces. Providing blank areas at both ends can be beneficial to heat dissipation and avoid the influence of the insulating top cover on heat dissipation. If an insulating coating is provided in the blank area, during the process of spraying the insulating coating, the transition part is prone to material accumulation, which will cause the insulating coating in the corner area to be relatively thick and affect the heat dissipation in this area. By setting the blank area, the heat dissipation performance of this part can be improved.

[0032] Among them, the assembly method of the cover plate and the housing is generally welding. To improve the insulation of the connection area between the housing and the cover plate, the insulating coating on the side surface can extend to the connection area between the cover plate and the housing.

[0033] Figure 3 It is a schematic top view structure diagram of a battery in an embodiment. As Figure 3 shown, in one embodiment, the projection of the transition part 13 in the plane where the opening is located is an arc, and the product R*S of the radius R of the arc and the area S of the blank area 14 satisfies 100 - 10000. Wherein, the unit of R is mm, and the unit of S is mm 2 . Exemplarily, the value of R*S can be, for example, 100, 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000, or a value between any two of the above values.

[0034] The smaller the radius R of the arc, the easier it is for heat to accumulate, and at this time, the area of the blank area needs to be set larger; the larger the radius R of the arc, the faster the heat dissipation, and the area of the blank area can be set smaller. When R*S is greater than or equal to 100 and at the same time less than or equal to 10000, R cannot be too large, otherwise the transition part will interfere with the battery cell. In addition, S cannot be too large, otherwise the too large blank area will increase the insulation risk.

[0035] In one embodiment, the ratio of the thickness D of the cover plate to the area S of the blank area satisfies 3 / 40000 to 3 / 20. Among them, the unit of the thickness D of the cover plate is mm, and the unit of S is mm. 2 . Exemplarily, the value of D / S can be, for example, 3 / 40000, 3 / 30000, 3 / 20000, 3 / 10000, 3 / 8000, 3 / 6000, 3 / 5000, 3 / 2000, 3 / 1700, 3 / 1500, 3 / 1000, 3 / 800, 3 / 500, 3 / 200, 3 / 100, 3 / 80, 3 / 50, 3 / 20 or any value between any two of the above values.

[0036] The higher the thickness of the cover plate, the more its own heat dissipation ability is affected. At this time, the area of the blank area can be set relatively large. If the thickness of the cover plate is low, its heat dissipation is fast, and the blank area can be set relatively small. Thus, controlling the ratio of D to S within the above range can effectively set the area of the blank area, prevent the area of the blank area from being set too large and causing a decrease in the insulation of the cover plate, and also avoid the blank area being set too small and failing to achieve the effect of enhancing heat dissipation.

[0037] In one embodiment, the ratio of the area S of the unilateral blank area to the area S0 of the outer surface of the cover plate satisfies 0.5 - 20%. Exemplarily, the ratio of S to S0 can be, for example, 0.5%, 1%, 3%, 5%, 8%, 10%, 11%, 12%, 15%, 17%, 18%, 20%, or any value between any two of the above values. The ratio of S to S0 cannot be too small. If it is too small, it is not conducive to heat dissipation in the corner area, and heat is not conducive to being exported from the blank area. At the same time, the ratio of S to S0 cannot be too large. If it is too large, there will be a risk of short - circuit between other structures, such as the pole post and the cover plate of the blank area. Therefore, controlling the ratio of S to S0 within the above range can be conducive to heat dissipation and also reduce the probability of short - circuit between the blank area and other structures.

[0038] Continue to refer to Figure 3, in one embodiment, the cover plate is provided with a terminal post, and the product of the distance L from the blank area to the terminal post and the thickness d of the insulating coating is 50 - 1000; wherein, L is in the unit of mm; d is in the unit of μm. Exemplarily, the product of L and d can be, for example, 50, 70, 100, 130, 150, 180, 200, 230, 250, 300, 400, 500, 600, 700, 800, 900, 1000, or any value between any two of the above values.

[0039] When assembling the battery pack, if the thickness d of the insulating coating is small, the insulation performance between adjacent batteries is relatively poor. As the terminal post is the high-voltage output end, the risk of breakdown short circuit between adjacent batteries will increase. Therefore, when the thickness of the insulating coating is small, the distance from the blank area to the terminal post needs to be appropriately increased to increase the insulation distance between the terminal post and the blank area and reduce the short-circuit risk. In addition, the distance from the blank area to the terminal post needs to be set slightly farther, that is, the position near the terminal post is covered by the insulating top cover, increasing the insulation protection between the batteries and reducing the risk of short circuit between the batteries.

[0040] In one embodiment, the battery further includes a battery cell, the battery cell is disposed in the accommodating cavity, the battery cell is a wound core, and the area S of the unilateral blank area accounts for 1.5 - 20% of the total area S0 of the cover plate. Exemplarily, the ratio of S 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. When the battery cell is a wound core, the heat in the transition part of the housing of the battery cell is more concentrated. If the heat is not dissipated in time, it is easy to cause the internal heat of the battery cell to be too high, leading to safety problems. Therefore, when the battery cell is a wound core, the area S of the blank area accounts for 1.5 - 20% of the total area S0 of the cover plate to improve the heat dissipation capacity of the blank area. When the battery cell is a stacked core, the area of the blank area can be appropriately reduced.

[0041] In one embodiment, the battery further includes a battery cell, the battery cell is provided with a tab, the area surrounded by the maximum outer dimension of the tab is the tab lead-out area, there is an overlapping area between the tab lead-out area and the blank area adjacent to the tab lead-out area, and the ratio of the area S of the blank area to the area S0 of the outer surface of the cover plate satisfies 2 - 20%. Exemplarily, the ratio of S to S0 can be, for example, 2%, 5%, 8%, 10%, 11%, 12%, 15%, 17%, 18%, 20%, or any value between any two of the above values.

[0042] The tab mainly undertakes the current-carrying function, and the heat generated at the tab position is relatively large. The blank area and the tab lead-out area are overlapped, which can quickly conduct the heat generated by the tab to the blank area and conduct it outward from the blank area. Among them, the tab lead-out area can be understood as the area surrounded by the outer contour line of the tab. Among them, when the tab is connected to the terminal through the connecting piece, the area surrounded by the contour line of the connecting piece can also be understood as the tab lead-out area.

[0043] Figure 4 It is a schematic structural diagram of a battery of an embodiment. As Figure 4 shown, in one embodiment, the insulating top cover 30 includes a top cover main body 31 and a flanging 32, and the flanging 32 extends from the top cover main body 31 along the side surface of the housing in a direction away from the top cover main body 31. The insulating top cover 30 is provided with the flanging 32 to provide more effective insulation protection for the welding seam between the cover plate 20 and the housing 10. At the same time, when assembling the battery, the flanging 32 is located on the side surface of the housing 10, between two adjacent batteries. Therefore, the insulation strength between adjacent batteries can be increased, and the risk of short circuit between adjacent batteries can be reduced.

[0044] In summary, for the battery of the embodiment of the present application, an insulating coating is provided on the outer surface of the housing, and the insulation between the batteries is realized by using the insulating coating. The heat generated by the battery core during charging and discharging is more likely to accumulate in the transition part of the battery side wall. In the present application, an insulating top cover is provided on the surface of the battery cover, and the length of the insulating top cover is less than the length of the cover plate, so a blank area can be left at the end of the cover plate, so that the heat of the transition part of the battery can be dissipated through the blank area. Among them, at the blank area, the cover plate is exposed, and the heat conduction performance is good. Therefore, by dissipating heat through the blank area, the heat dissipation of the battery transition part can be improved, and heat accumulation can be prevented. When connecting multiple batteries, the connecting piece can be arranged in the blank area and connected to the blank area to improve the connection strength between the connecting piece and the cover plate.

[0045] Based on the same technical purpose, the embodiment of the present application also provides a battery pack. Figure 5 It is a schematic structural diagram of a battery pack. As Figure 5 shown, the battery pack includes a plurality of batteries 01 and a bus bar (not shown in the figure). Among them, the plurality of batteries 01 are stacked in the width direction of the battery, that is, the y direction, and the width direction of the battery is the direction perpendicular to the large surface of the battery. The above battery is the battery provided by the embodiment of the present application. The bus bar is arranged above the cover plate and is used to connect the terminals of a plurality of batteries to form a series-parallel connection. The distance between the blank area in the battery and the bus bar is 0.5-5 mm. Exemplarily, the distance between the blank area and the bus bar can be, for example, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, or any value between the above two values.

[0046] In the battery pack according to the embodiment of the present application, the multiple batteries can be connected in series and parallel through a bus bar. Among them, since the blank area is an exposed cover plate and the cover plate is a conductive cover plate, the interval between the blank area and the bus bar needs to meet 0.5 - 5 mm to ensure a certain insulation between the blank area and the bus bar and avoid discharge between the two.

[0047] Referring to Figure 5 , in one embodiment, the battery pack further includes a connecting member 02. Along the stacking direction of the multiple batteries, the connecting member 02 is bonded to the blank areas on the same side of the multiple batteries 01. The connecting member 02 can be connected to multiple batteries in the stacking direction, such as two or more batteries. The number of connecting members can be one, two, or multiple.

[0048] The connecting member is connected to the blank area 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 blank area. The connecting member can be a strip-shaped connecting plate or other shapes, and no specific limitation is made here. The connecting member can press all the batteries in the battery pack at the same time. It can be understood that in the battery pack, the blank areas on the same side of each battery can be pressed by the same connecting member or different connecting members.

[0049] In one embodiment, the battery pack further includes a heat exchange component. 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 the area of the second side. The heat exchange component is arranged between the first sides of two adjacent batteries, and the area of the blank area accounts for 3 - 20% of the surface area of the cover plate. Exemplarily, the ratio of the area of the blank area to the area of the cover plate can be, for example, 3%, 5%, 8%, 10%, 11%, 12%, 15%, 17%, 18%, 20%, or any value between any two of the above values.

[0050] Among them, the heat exchange component can be arranged between the large surfaces of two adjacent batteries. When a heat exchange component is arranged between the batteries, the heat dissipation effect of the batteries increases. At this time, the proportion of the area of the blank area on the cover plate can be appropriately reduced. Due to the connection and bonding of the blank area, in order to increase the connection strength between the blank area and the connecting member, the area of the blank area cannot be too small. The width of the connecting member and the width of the blank area are both dimensions along the length direction of the cover plate.

[0051] 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, Comprising: A housing having an opening, and an insulating coating is provided on the outer surface of the housing; the housing includes a plurality of side surfaces, and a transition portion is provided between two adjacent side surfaces; A cover plate disposed at the opening of the housing and forming a receiving cavity with the housing; An insulating top cover is provided on the outer surface of the cover plate and is stacked with the cover plate. Along the length direction of the cover plate, the length of the insulating top cover is less than the length of the cover plate so that at least one end of the cover plate has a blank area not covered by the insulating top cover, and the blank area extends along the width direction of the cover plate to two opposite side surfaces of the housing and the transition portion.

2. The battery according to claim 1, wherein The projection of the transition part in the plane where the opening is located is an arc, and the product of the radius R of the arc and the area S of the blank area satisfies 100 - 10000; where the unit of R is mm and the unit of S is mm 2 .

3. The battery according to claim 1 or 2, characterized in that, The ratio of the thickness D of the cover plate to the area S of the blank area satisfies 3 / 40000 to 3 / 20; where the unit of D is mm and the unit of S is mm 2 .

4. The battery according to claim 1 or 2, characterized in that, The ratio of the area S of one-sided blank area to the area S0 of the outer surface of the cover plate satisfies 0.5 - 20%.

5. The battery according to claim 1 or 2, characterized in that, The battery further includes an electric core disposed in the receiving cavity. The electric core is a wound core, and the area S of one-sided blank area accounts for 1.5 - 20% of the total area S0 of the cover plate.

6. The battery according to claim 1 or 2, characterized in that, The battery further includes an electric core having a tab. The area surrounded by the maximum outer dimension of the tab is the tab lead-out area. There is an overlapping area between the tab lead-out area and the blank area adjacent to the tab lead-out area, and the ratio of the area S of the blank area to the area S0 of the outer surface of the cover plate satisfies 2 - 20%.

7. The battery according to claim 1 or 2, characterized in that, The insulating top cover includes a top cover body and a flanging. The flanging extends from the top cover body along the side surface of the housing in a direction away from the top cover body.

8. A battery pack, characterized in that, Comprising: A plurality of batteries as described in any one of claims 1 - 7, and the plurality of batteries are stacked along the width direction of the battery; A bus bar for connecting the pole columns of the plurality of batteries to form a series-parallel connection; The distance between the blank area in the battery and the bus bar is 0.5 - 5 mm.

9. The battery pack according to claim 8, wherein The battery pack further includes a connecting member. Along the stacking direction of the plurality of batteries, the connecting member is bonded to the blank areas on the same side of the plurality of batteries.

10. The battery pack according to claim 8 or 9, 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 oppositely arranged, and the two second side surfaces are oppositely arranged. The area of the first side surface is larger than the area of the second side surface. The heat exchange component is disposed between the first side surfaces of two adjacent batteries, and the area of the blank area accounts for 3 - 20% of the surface area of the cover plate.

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