Battery pack and battery device

Abstract

The utility model relates to the technical field of batteries, and provides a battery pack and a battery device, the battery pack comprises a battery and a busbar, the battery comprises a battery shell, the battery shell comprises a first end wall, and the first end wall is used for forming a voltage output end of the battery; the busbar is located on the side, provided with the first end wall, of the battery and comprises a shell connecting part, and the orthographic projection of the shell connecting part on the first end wall is located on the first end wall; wherein the shell connecting part comprises a first connecting part and a second connecting part, the first connecting part is connected with the first end wall, a gap is formed between the second connecting part and the first end wall, the minimum distance between the second connecting part and the first end wall is A, the thickness of the busbar is B, and A / B is larger than 0 and smaller than or equal to 5. The battery pack provided by the utility model can dissipate heat by utilizing the gap between the second connecting part and the first end wall.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack and a battery device. Background Art

[0002] In the related art, a battery device includes multiple batteries and a bus bar. The bus bar is used to connect the multiple batteries to connect the multiple batteries in series or in parallel. However, the battery device generates a lot of heat at the bus bar position, which can easily lead to thermal runaway of the battery device.

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

[0004] The utility model provides a battery pack, which can improve the technical problem of heat easily accumulating at the connection position between the bus bar and the battery shell.

[0005] The battery pack includes:

[0006] A battery, the battery comprising a battery housing, the battery housing comprising a first end wall, the first end wall being used to form a voltage output end of the battery;

[0007] a busbar located on a side of the battery provided with the first end wall, the busbar including a shell connecting portion, the orthographic projection of the shell connecting portion on the first end wall being located on the first end wall;

[0008] Among them, the shell connection part includes a first connection part and a second connection part, the first connection part is connected to the first end wall, the second connection part and the first end wall are separated by a gap, the minimum distance between the second connection part and the first end wall is A, the thickness of the bus is B, and A / B is greater than 0 and less than or equal to 5.

[0009] In the present invention, the busbar needs to be welded to the battery shell, which generates a lot of heat during welding. In addition, the busbar is electrically connected to the battery shell, and heat is generated during the battery charging and discharging process. The present invention has a gap between the second connecting portion and the first end wall, and the battery pack can dissipate heat through this gap. This setting can improve the problem of heat accumulation at the busbar position. In addition, A / B is too large, A is too large or B is too small. When A is too large, the busbar is set higher, and the busbar and battery will occupy more space in the battery pack. When B is too small, the resistance of the busbar is large, and the busbar will generate more heat during the conduction process. When A / B is too small, A is too small, and the effect of heat dissipation of the battery pack through the gap is not obvious. The present invention sets A / B to an appropriate size. This setting not only improves the space utilization of the battery pack, but also increases the heat dissipation speed at the busbar position.

[0010] The utility model provides a battery device, which includes the battery pack mentioned above.

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

[0012] For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of the present disclosure. Furthermore, related elements or components may have different arrangements as is known in the art. Furthermore, in the drawings, the same reference numerals represent the same or similar components throughout the various figures.

[0013] in:

[0014] Figure 1 This is a schematic structural diagram of an exemplary embodiment of a battery device disclosed herein;

[0015] Figure 2 for Figure 1 An enlarged view of a local area AA in the battery device shown;

[0016] Figure 3 is a top view of an exemplary embodiment of a battery device disclosed herein;

[0017] Figure 4 for Figure 3 An enlarged view of a local area BB in the battery device shown;

[0018] Figure 5 for Figure 4 A cross-sectional view of the battery device shown along the dashed line CC;

[0019] Figure 6 FIG. 1 is a schematic diagram of the structure of a battery in an exemplary embodiment of the battery device disclosed herein.

[0020] Description of reference numerals:

[0021] 1. Battery; 11. Battery shell; 111. First end wall; 11x. Battery row; 11xy. Battery cell; 12. Post; 13. Cell body; 2. Busbar; 21. Shell connection; 211. First connection; 212. Second connection; 3. Triangular gap; 4. Heat exchange assembly; 5. Battery case; 6. Gap. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0023] In the description of this disclosure, unless otherwise expressly provided or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more; and the term "and / or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" or "an" object is also intended to mean one of a possible plurality of such objects.

[0024] Unless otherwise specified or explained, the terms "connect," "fixed," etc. should be understood broadly. For example, "connected" may refer to a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; and "connected" may refer to a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0025] Furthermore, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", and "outer" described in the exemplary embodiments of the present disclosure are described from the perspectives shown in the accompanying drawings and should not be understood as limiting the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner" or "outer" of another element, it can not only be directly connected to the "upper", "lower", or "inner" or "outer" of the other one or more elements, but can also be indirectly connected to the "upper", "lower", or "inner" or "outer" of the other one or more elements through an intermediate element.

[0026] like Figure 1-6 As shown, Figure 1 This is a schematic structural diagram of an exemplary embodiment of a battery device disclosed herein. Figure 2 for Figure 1 An enlarged view of a local area AA in the battery device shown, Figure 3 FIG1 is a top view of an exemplary embodiment of a battery device disclosed herein. Figure 4 for Figure 3 An enlarged view of a local area BB in the battery device shown, Figure 5 for Figure 4 The cross-sectional view of the battery device shown along the dotted line CC, Figure 6 FIG. 1 is a schematic diagram of the structure of a battery in an exemplary embodiment of the battery device disclosed herein.

[0027] The battery device includes a battery pack, which includes: a battery 1 and a bus 2. The battery 1 includes a battery shell 11, the battery shell 11 includes a first end wall 111, and the first end wall 111 is used to form a voltage output end of the battery 1; the bus 2 is located on the side of the battery 1 where the first end wall 111 is provided, and the bus includes a shell connecting portion 21, and the orthographic projection of the shell connecting portion 21 on the first end wall 111 is located on the first end wall 111; wherein, the shell connecting portion 21 includes a first connecting portion 211 and a second connecting portion 212, the first connecting portion 211 is connected to the first end wall 111, and the second connecting portion 212 and the first end wall 111 are separated by a gap 6, the minimum distance between the second connecting portion 212 and the first end wall 111 is A, the thickness of the bus 2 is B, and A / B is greater than 0 and less than or equal to 5.

[0028] In this exemplary embodiment, the busbar needs to be welded to the battery housing, generating significant heat during welding. Furthermore, the busbar is electrically connected to the battery housing, generating heat during the battery charging and discharging process. In this exemplary embodiment, a gap 6 is provided between the second connecting portion 212 and the first end wall 111. This gap 6 allows heat to be dissipated from the battery pack, mitigating the problem of heat accumulation at the busbar 2. Furthermore, if the ratio A / B is too large, A is too large or B is too small, busbar 2 is positioned higher, and busbar 2 and battery 1 occupy more space in the battery pack. If B is too small, busbar 2 has a higher resistance, generating more heat during electrical conduction. If A / B is too small, heat dissipation from the battery pack through gap 6 is ineffective. The present invention sets A / B to an appropriate value, which not only improves battery pack space utilization but also increases heat dissipation at the busbar. In this exemplary embodiment, A / B may be equal to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, etc.

[0029] In this exemplary embodiment, Figure 1-6As shown, the battery 1 further includes a pole 12, which is arranged on the first end wall 111, and the polarity of the pole 12 and the first end wall 111 are opposite; the ratio of the area of ​​the orthographic projection of the first connecting portion 211 on the first end wall 111 to the area of ​​the first end wall 111 is 0.03-0.3. For example, the ratio of the area of ​​the orthographic projection of the first connecting portion 211 on the first end wall 111 to the area of ​​the first end wall 111 can be equal to 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, etc. If the ratio of the area of ​​the orthographic projection of the first connection portion 211 on the first end wall 111 to the area of ​​the first end wall 111 is too small, the connection area between the busbar 2 and the first end wall 111 is small, and the flow area of ​​the busbar 2 is too small. If the ratio of the area of ​​the orthographic projection of the first connection portion 211 on the first end wall 111 to the area of ​​the first end wall 111 is too large, the area of ​​the orthographic projection of the first connection portion 211 on the first end wall 111 is too large, the area of ​​the orthographic projection of the second connection portion 212 on the first end wall 111 is too small, and the area of ​​the gap between the second connection portion 212 and the first end wall 111 is also too small, making it difficult for the battery pack to dissipate heat through the gap 6. In this exemplary embodiment, the ratio of the area of ​​the orthographic projection of the first connection portion 211 on the first end wall 111 to the area of ​​the first end wall 111 is set to an appropriate size. This setting can both ensure the flow area of ​​the busbar 2 and increase the heat dissipation rate of the battery pack through the gap.

[0030] It should be noted that the second connecting portion 212 does not include the area welded to the first end wall 111, and the minimum distance between the second connecting portion 212 and the first end wall 111 is greater than 0. The first connecting portion 211 may be partially welded to the first end wall 111, that is, the weld mark between the first connecting portion 211 and the first end wall 111 only covers a portion of the side of the first connecting portion 211 facing the first end wall 111. Alternatively, the weld mark between the first connecting portion 211 and the first end wall 111 may completely cover the entire side of the first connecting portion 211 facing the first end wall 111.

[0031] In this exemplary embodiment, Figure 1-6As shown, the area of ​​the orthographic projection of the first connecting portion 211 on the first end wall 111 is S. The value of A / S is greater than 0 and less than or equal to 0.02, and the unit of A / S is 1 / mm. For example, the value of A / S can be 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.011, 0.012, 0.013, 0.014, 0.015, 0.016, 0.017, 0.018, 0.019, 0.02, etc. If A / S is too large and S is too small, the flow area of ​​the bus 2 will be too small; if A / S is too small and A is too small, the heat dissipation effect of the gap 6 will not be obvious. This exemplary embodiment sets A / S to an appropriate size, which can not only ensure the flow area of ​​the bus 2, but also improve the heat dissipation efficiency of the bus position.

[0032] In this exemplary embodiment, Figure 1-6 As shown, the battery pack includes a plurality of battery rows 11x distributed along a first direction X, and the battery rows 11x include a plurality of batteries 1 distributed along a second direction Y. The first direction X and the second direction Y intersect; the batteries 1 in adjacent battery rows 11x are staggered in sequence in the second direction Y, and the battery 1 and the two batteries 1 in the adjacent battery rows 11x are arranged adjacent to each other and form a triangular gap 3. A / B is greater than 0 and less than or equal to 4. For example, A / B can be equal to 0.05, 0.1, 0.5, 1, 2, 3, 4, etc. The triangular gap 3 can prevent the heat dissipated from the gap 6 from affecting other batteries. Figure 1-6 As shown, the triangular gap 3 is a triangular shape. When there is a triangular gap, heat can also be dissipated through the triangular gap, so A can be set smaller to reduce the space occupied by the busbar in height.

[0033] In this exemplary embodiment, Figure 1-6As shown, the battery 1 further includes a cell body 13 located within the battery housing 11. The battery pack also includes a heat exchange assembly 4 located between two adjacent battery rows 11x. The ratio of the dimension h1 of the heat exchange assembly 4 perpendicular to the first end wall 111 to the dimension h2 of the cell body 13 perpendicular to the first end wall 111 is greater than or equal to 0.5 and less than or equal to 1. For example, h1 / h2 can be equal to 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc. Heat dissipated from the gap 6 can be absorbed by the heat exchange assembly 4. If h1 / h2 is too small, the dimension of the heat exchange assembly 4 perpendicular to the first end wall 111 is too small, and the heat exchange assembly 4 is not effective in absorbing heat dissipated from the gap 6. If h1 / h2 is too large, the dimension of the heat exchange assembly 4 perpendicular to the first end wall 111 is too large, and the heat exchange assembly 4 is likely to interfere with the bus bar 2. In this exemplary embodiment, h1 / h2 is set to an appropriate value. This setting ensures that the heat exchange assembly 4 efficiently absorbs heat dissipated from gap 6 while preventing interference between the heat exchange assembly 4 and the busbar 2. As the heat exchange assembly absorbs more heat, it removes most of the heat, allowing the gap to be smaller without excessive heat concentration in the battery. Accordingly, A / B is greater than 0 and less than or equal to 3. For example, A / B can be 0.1, 1, 2, 3, and so on.

[0034] Heat exchange assembly 4 may be formed with a heat conduction channel through which a heat transfer medium can circulate to achieve heat exchange with the battery. In this exemplary embodiment, heat exchange assembly 4 can both cool and heat the battery. For example, when the battery temperature is high, heat exchange assembly 4 can cool the battery to improve the safety and stability of the battery pack. When the battery temperature is too low in an extremely cold environment to affect normal use, heat exchange assembly 4 can heat the battery to adapt to a wider range of usage environments.

[0035] In this exemplary embodiment, Figure 1-6 As shown, the battery pack includes a plurality of battery cells 11xy distributed along a first direction X. The battery cells 11xy include a plurality of battery rows 11x distributed along the first direction X. The battery rows 11x include a plurality of batteries 1 distributed along a second direction Y. The first direction X and the second direction Y intersect. The battery pack also includes a heat exchange assembly 4 and an isolator (not shown). The heat exchange assembly 4 is located between adjacent battery cells 11xy. The isolator is located between adjacent battery rows 11x in the same battery cell 11xy. The isolator can prevent heat dissipated from the gap 6 from affecting adjacent battery columns. The isolator can be a thermal insulator, for example, made of fiberglass, asbestos, rock wool, silicate, vacuum board, etc.

[0036] In this exemplary embodiment, Figure 1-6As shown, the battery housing 11 may be a steel housing, and A / B is 1-5. For example, A / B may be 1, 2, 3, 4, 5, etc. The welding power required to weld the steel housing and the busbar 2 is relatively high, and the heat generated at the busbar 2 during welding is relatively high. Accordingly, the value of A may be increased to improve the heat dissipation effect of the gap 6, thereby preventing excessive heat accumulation at the busbar 2 during welding.

[0037] In this exemplary embodiment, Figure 1-6 As shown, the busbar 2 comprises aluminum. For example, the busbar is an aluminum structure, and aluminum has a poor thermal conductivity. During the subsequent charging and discharging process, more heat is generated. Therefore, the gap 6 needs to be larger. Accordingly, A / B is greater than or equal to 0.5 and less than or equal to 5. For example, A / B can be equal to 0.5, 1, 2, 3, 4, 5, etc.

[0038] In this exemplary embodiment, Figure 1-6 As shown, the minimum distance between the shell connection part 21 and the pole 12 is greater than or equal to 1mm. An insulating member is provided between the pole 12 and the battery shell 11. If the minimum distance between the shell connection part 21 and the pole 12 is too small, the heat dissipated from the gap 6 can easily cause the insulating member to melt and be damaged. In this exemplary embodiment, the minimum distance between the shell connection part 21 and the pole 12 is set to be greater than or equal to 1mm. This setting can reduce the risk of melting of the insulating member. The minimum distance between the shell connection part 21 and the pole 12 can be equal to 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0039] In this exemplary embodiment, Figure 1-6 As shown, the battery device may further include a battery box 5 , in which the battery pack is located.

[0040] It should be noted that a battery comprises a cell and an electrolyte. A battery is the smallest unit capable of carrying out electrochemical reactions such as charge and discharge. A cell is formed by winding or laminating a stack of components, which includes a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. The polarity of the first and second electrodes can be interchangeable. The first and second electrodes are coated with an active material.

[0041] In this exemplary embodiment, the battery may be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery may also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, a sodium-ion battery, a solid-state battery, etc.

[0042] In this exemplary embodiment, the battery may be a cylindrical battery. In other exemplary embodiments, the battery may be a square battery, that is, a quadrangular prism-shaped battery. A quadrangular prism-shaped battery primarily refers to a prism-shaped battery, but does not strictly limit whether each side of the prism must be a strictly straight line. The corners between the sides do not necessarily have to be right angles, and may be arc transitions.

[0043] The battery can be a laminated battery, which is not only easy to group but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first electrode sheet stacked on top of each other, a second electrode sheet with opposite electrical properties to the first electrode sheet, and a diaphragm sheet disposed between the first and second electrode sheets, so that multiple pairs of first and second electrode sheets are stacked to form a laminated battery cell.

[0044] Alternatively, the battery may be a wound battery, that is, a first electrode sheet, a second electrode sheet having electrical properties opposite to the first electrode sheet, and a diaphragm sheet arranged between the first electrode sheet and the second electrode sheet are wound to obtain a wound battery cell.

[0045] In this exemplary embodiment, the battery device is a battery module or a battery pack.

[0046] The battery module includes multiple batteries, which can be prismatic batteries. The battery module can also include end plates and side plates for fixing the multiple batteries. The batteries can be cylindrical batteries, which can be placed on a support plate to form a battery module.

[0047] The battery pack includes multiple batteries and a box body, and the box body is used to fix the multiple batteries.

[0048] It should be noted that the battery device proposed in the present invention can be used in various electrical devices, such as mobile phones, portable devices, laptop computers, various vehicles (such as electric vehicles, electric vehicles, etc.), ships, spacecraft, electric toys and electric tools, etc. Furthermore, the above-mentioned spacecraft may include, for example, airplanes, rockets, space shuttles and spacecrafts. The above-mentioned electric toys may include, for example, fixed or mobile electric toys (such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.). The above-mentioned electric tools may include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, specifically, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers. It should be understood that in various possible embodiments consistent with the design concept of the present invention, the cylindrical battery or battery device proposed in the present invention is not limited to the devices described above, but can also be applied to all devices that use batteries. For the sake of simplicity, the various embodiments in this specification are described using vehicles as an example.

[0049] It should be noted that the battery pack includes multiple batteries, which can be placed in a housing. The batteries can be assembled into a battery module and then installed in the housing. Alternatively, the batteries can be placed directly in the housing, without grouping them together, and the housing can be used to secure the batteries.

[0050] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the claims.

[0051] The drawings in this disclosure only relate to the structures involved in this disclosure, and other structures may refer to the general design. In the absence of conflict, the embodiments of this disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those skilled in the art that the technical solutions of this disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of this disclosure, and should be included in the scope of the claims of this disclosure.

[0052] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery pack, characterized in that: The battery pack comprises: A battery (1), the battery (1) comprising a battery housing (11), the battery housing (11) comprising a first end wall (111), the first end wall (111) being used to form a voltage output terminal of the battery (1); a busbar (2) located on a side of the battery (1) provided with the first end wall (111), the busbar comprising a shell connecting portion (21), the orthographic projection of the shell connecting portion (21) on the first end wall (111) being located on the first end wall (111); The shell connecting portion (21) comprises a first connecting portion (211) and a second connecting portion (212), the first connecting portion (211) is connected to the first end wall (111), the second connecting portion (212) and the first end wall (111) are separated by a gap (6), the minimum distance between the second connecting portion (212) and the first end wall (111) is A, the thickness of the busbar is B, and A / B is greater than 0 and less than or equal to 5.

2. The battery pack according to claim 1, characterized in that: The battery (1) further comprises a pole (12), wherein the pole (12) is arranged on the first end wall (111), and the polarity of the pole (12) and the first end wall (111) are opposite; The ratio of the area of ​​the orthographic projection of the first connecting portion (211) on the first end wall (111) to the area of ​​the first end wall (111) is 0.03-0.

3.

3. The battery pack according to claim 1, characterized in that: The area of ​​the orthographic projection of the first connecting portion (211) on the first end wall (111) is S; the value of A / S is greater than 0 and less than or equal to 0.02, and the unit of A / S is 1 / mm.

4. The battery pack according to claim 1, characterized in that: The battery pack comprises a plurality of battery rows (11x) distributed along a first direction (X), the battery rows (11x) comprising a plurality of batteries (1) distributed along a second direction (Y), the first direction (X) and the second direction (Y) intersecting; The batteries (1) in adjacent battery rows (11x) are arranged alternately in sequence in the second direction (Y), and the battery (1) and two batteries (1) in the adjacent battery row (11x) are arranged adjacent to each other and form a triangular gap (3); A / B is greater than 0 and less than or equal to 4.

5. The battery pack according to claim 4, characterized in that: The battery (1) further comprises a battery cell body (13), wherein the battery cell body (13) is located in the battery housing (11), and the battery pack further comprises: A heat exchange component (4), the heat exchange component (4) being located between two adjacent battery rows (11x); The ratio of the dimension (h1) of the heat exchange component (4) in a direction perpendicular to the first end wall (111) to the dimension (h2) of the battery cell body (13) in a direction perpendicular to the first end wall (111) is greater than or equal to 0.5 and less than or equal to 1, and AB is greater than 0 and less than or equal to 3.

6. The battery pack according to claim 1, characterized in that: The battery pack comprises a plurality of battery cells (11xy) distributed along a first direction (X), the battery cells (11xy) comprise a plurality of battery rows (11x) distributed along the first direction (X), the battery rows (11x) comprise a plurality of the batteries (1) distributed along a second direction (Y), and the first direction (X) and the second direction (Y) intersect; The battery pack further comprises: A heat exchange component (4), the heat exchange component (4) being located between adjacent battery cells (11xy); A separator is located between adjacent battery rows (11x) in the same battery unit (11xy).

7. The battery pack according to any one of claims 1 to 6, characterized in that: The battery housing (11) is a steel shell, and A / B is 1-5.

8. The battery pack according to any one of claims 1 to 6, characterized in that: The busbar (2) comprises aluminum, and A / B is greater than or equal to 0.5 and less than or equal to 5.

9. The battery pack according to any one of claims 1 to 6, characterized in that: The battery (1) further comprises a pole (12), wherein the pole (12) is arranged on the first end wall (111), and the polarity of the pole (12) and the first end wall (111) are opposite; The minimum distance between the housing connection portion (21) and the pole (12) is greater than or equal to 1 mm.

10. The battery pack according to any one of claims 1 to 6, characterized in that: The battery (1) is a cylindrical battery.

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

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