Battery, battery pack and electric device

Abstract

The utility model relates to a battery, battery pack and electric equipment. The battery includes the core and the pole post subassembly. The core includes the core body and the tab that stretches from the core body. The pole post subassembly includes the adapter piece and the pole post. The adapter piece and the tab are arranged in layers, and the surface of the adapter piece facing the tab has a welding area welded with the tab. The pole post is provided on the side of the adapter piece away from the tab and is integrally formed with the adapter piece, and the orthogonal projection of the pole post along the thickness direction of the tab at least partially overlaps the orthogonal projection of the welding area along the thickness direction. The integrally formed pole post and adapter piece can eliminate the welding between the pole post and the adapter piece, reduce the resistance in the current path, enhance the overcurrent capacity of the adapter piece, and reduce the risk of heating caused by resistance during the charging and discharging process of the battery. In addition, the welding area of the adapter piece can have a larger area, which helps to improve the welding strength and reliability between the tab and the adapter piece, further enhance the overcurrent capacity of the adapter piece, and improve the charging and discharging efficiency of the battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular, to a battery, a battery pack, and an electrical device. Background Technology

[0002] With the rapid development of new energy technologies, batteries are widely used in electric vehicles, energy storage systems, and consumer electronics. In battery structure, the tabs of the cell are connected to the terminals via adapter plates to achieve current transmission. In traditional battery designs, the terminals and adapter plates are connected by welding.

[0003] However, welding the terminals to the adapter increases the resistance in the current path, reduces current transmission efficiency, and causes excessive heat to be generated in localized areas, thus increasing the risk of heat accumulation. When the heat cannot be dissipated effectively and in a timely manner, it may also cause the battery temperature to rise sharply, inducing safety hazards such as thermal runaway. Utility Model Content

[0004] In view of this, the present invention provides a battery, a battery pack and an electrical device, aiming to reduce the probability of local overheating and thermal runaway of the battery.

[0005] In a first aspect, the battery provided by this utility model includes a battery cell and a terminal assembly. The battery cell includes a battery cell body and a tab extending from the battery cell body. The terminal assembly includes an adapter plate and a terminal. The adapter plate and the tab are stacked together, and the surface of the adapter plate facing the tab has a welding area for welding to the tab. The terminal is disposed on the side of the adapter plate facing away from the tab and is integrally formed with the adapter plate, and the orthographic projection of the terminal along the thickness direction of the tab at least partially overlaps with the orthographic projection of the welding area along the thickness direction.

[0006] Secondly, the battery pack provided by this utility model includes the battery mentioned above.

[0007] Thirdly, the electrical equipment provided by this utility model includes the battery or battery pack mentioned above.

[0008] The positive effects of the above-mentioned technical solutions on batteries, battery packs, and electrical equipment are as follows:

[0009] The integral molding of the terminal block and adapter plate eliminates the need for welding between them, reduces resistance in the current path, enhances the current-carrying capacity of the adapter plate, and reduces the risk of heat generation caused by resistance during battery charging and discharging. Furthermore, the orthographic projection of the terminal block along the thickness direction of the tab at least partially overlaps with the orthographic projection of the welding area along the thickness direction, allowing for a larger welding area for the adapter plate. This helps improve the welding strength and reliability between the tab and the adapter plate, while further enhancing the current-carrying capacity of the adapter plate and improving the battery's charging and discharging efficiency. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0011] It should be understood that the following figures only show some embodiments of the present invention and should not be regarded as a limitation on the scope.

[0012] It should also be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0013] It should also be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0014] Figure 1 This is a structural schematic diagram of an electrical device according to an embodiment of the present utility model.

[0015] Figure 2 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present invention.

[0016] Figure 3 This is a schematic diagram of the structure of a battery according to an embodiment of the present invention.

[0017] Figure 4 yes Figure 3 A schematic diagram of the battery in the image.

[0018] Figure 5 yes Figure 3 A schematic diagram of a portion of the battery.

[0019] Figure 6 yes Figure 3 A schematic diagram of the structure of the terminals and cover plate in the battery.

[0020] Figure 7 yes Figure 3 An exploded view of the terminals and cover plate in a battery.

[0021] Figure 8 yes Figure 3 A top view of a portion of the battery.

[0022] Figure 9 yes Figure 3 A top view of a portion of the battery.

[0023] Figure 10 yes Figure 3 A schematic diagram of the battery terminals.

[0024] Figure 11 yes Figure 3 A cross-sectional view of a portion of the battery.

[0025] Figure 12yes Figure 3 A cross-sectional view of a portion of the battery.

[0026] Figure 13 This is a schematic diagram of the structure of a battery according to another embodiment of the present invention.

[0027] Explanation of reference numerals in the attached drawings: Battery-100; Cell-10; Cell body-11; Tab-12; Terminal assembly-20; Adapter-21, 21a; Welding area-211; Terminal-22; Housing-30; Receiving shell-31; Raised portion-311; Edge portion-312; Cover plate-32; Sealing portion-321; Through hole-322; Receiving space-33; First receiving portion-331; Second receiving portion-332; Insulator-41; Tab extension inlet-411; Terminal extension outlet-412; Connection space-413; Conductive component-50; Battery pack-200; Electrical device-300. Detailed Implementation

[0028] The embodiments of the present invention will now be described by way of example with reference to the accompanying drawings. It should be understood that there are many ways to implement the present invention, and it should not be construed as being limited to the embodiments described herein. The embodiments described herein are only for a more thorough and clear understanding of the present invention.

[0029] <Example Electrical Equipment>

[0030] This utility model provides an electrical device 300, which may include a battery pack 200.

[0031] By way of example only, electrical equipment 300 can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, engineering vehicles, etc.

[0032] In addition, electrical equipment 300 can also be used for the storage, conversion and release of recyclable electrical energy.

[0033] In a non-restrictive example, refer to Figure 1 The electrical equipment 300 can be an electric vehicle 300, and the battery pack 200 can be used as a power source to provide power to the electric vehicle 300.

[0034] <Example Battery Pack>

[0035] refer to Figure 2 The battery pack 200 includes multiple batteries 100, which can be connected in series and / or in parallel.

[0036] <Example Battery>

[0037] refer to Figure 3 and Figure 4The battery 100 includes a cell 10 and a terminal assembly 20. The cell 10 includes a cell body 11 and a tab 12 extending from the cell body 11. The terminal assembly 20 is used to connect to the tab 12 of the cell 10 to output or input electrical energy to the battery 100.

[0038] As an example, see reference Figure 5 The battery cell 10 includes two tabs 12, and the battery 100 includes two terminal assemblies 20. The two tabs 12 extend from opposite ends of the battery cell body 11 and are connected to the corresponding two terminal assemblies 20.

[0039] Continue to refer to Figure 3 and Figure 4 The battery 100 also includes a housing 30. The housing 30 includes a receiving shell 31 and a cover plate 32. The receiving shell 31 has a raised portion 311 that protrudes toward the side opposite to the cover plate 32 and an edge portion 312 surrounding the raised portion 311. The cover plate 32 mates with the receiving shell 31 in the thickness direction to form a receiving space 33 with the raised portion 311, and connects with the edge portion 312 to form a sealing edge portion 321 that surrounds and closes the receiving space 33.

[0040] A battery cell is the smallest charging and discharging unit. A battery cell consists of a positive electrode, a negative electrode, and a separator between them, formed by winding or stacking. The positive electrode includes a positive current collector and a positive active material. The positive current collector can be made of metals such as aluminum foil, nickel foil, or stainless steel, or a composite foil formed by combining metals and insulating materials. The positive active material includes the main positive active material, a conductive agent, and a binder. The main positive active material includes one or more of lithium-containing positive active materials such as lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate. Similarly, the negative electrode includes a negative current collector and a negative active material. The negative current collector can be made of metals such as copper foil, aluminum foil, or stainless steel, or a composite foil formed by combining metals and insulating materials. The negative active material includes the main negative active material, a conductive agent, and a binder. The main negative active material includes one or more of the main negative active materials such as artificial graphite, natural graphite, silicon carbide, silicon oxide, and lithium titanate. The tab serves as the current output terminal of the battery cell, and it can be integrally connected to the positive or negative electrode plate or connected separately. The separator, as an insulating layer, prevents short circuits within the battery cell caused by contact between the positive and negative electrodes. Furthermore, as a semi-permeable layer, the separator prevents larger molecules from passing through while allowing smaller charged ions to pass. The base of the tab is the edge of the active material coating area of ​​the electrode plate.

[0041] It should be noted that in the accompanying drawings of this utility model, arrows X+ and X- are used to indicate the opposite sides of the thickness direction, arrows Y+ and Y- are used to indicate the opposite sides of the first direction mentioned below, and arrows Z+ and Z- are used to indicate the opposite sides of the second direction mentioned below. The thickness direction, the first direction, and the second direction are perpendicular to each other.

[0042] Combination Figure 11 and Figure 12 The accommodating space 33 includes a first accommodating portion 331 and two second accommodating portions 332, which are located on opposite sides of the first accommodating portion 331 in a first direction. The first accommodating portion 331 has a thickness dimension larger than that of each of the second accommodating portions 332 in the thickness direction. The battery cell body 11 is disposed in the first accommodating portion 331, and the two terminal assemblies 20 are respectively at least partially disposed in the two second accommodating portions 332.

[0043] refer to Figures 5 to 8 The electrode assembly 20 includes an adapter piece 21 and an electrode post 22. The adapter piece 21 is stacked with the tab 12, and the surface of the adapter piece 21 facing the tab 12 has a welding area 211 for welding to the tab 12. The electrode post 22 is located on the side of the adapter piece 21 facing away from the tab 12 and is integrally formed with the adapter piece 21. The orthographic projection of the electrode post 22 along the thickness direction of the tab 12 at least partially overlaps with the orthographic projection of the welding area 211 along the thickness direction.

[0044] The integral molding of the terminal post 22 and the adapter piece 21 eliminates the need for welding between them, reduces resistance in the current path, and enhances the current-carrying capacity of the adapter piece 21. During the charging and discharging process of the battery 100, this implementation reduces the temperature rise caused by resistance heating, thereby reducing the risk of local overheating and thermal runaway. Furthermore, the orthographic projection of the terminal post 22 along the thickness direction of the tab 12 at least partially overlaps with the orthographic projection of the welding area 211 along the thickness direction, allowing the welding area 211 of the adapter piece 21 to have a larger area. This helps to improve the welding strength and reliability between the tab 12 and the adapter piece 21, while further enhancing the current-carrying capacity of the adapter piece 21 and improving the charging and discharging efficiency of the battery 100.

[0045] refer to Figure 6In one embodiment of this utility model, the terminal assembly 20 includes two adapter pieces 21 and two terminals 22. The two adapter pieces 21 are integrally formed with the two terminals 22, and the two adapter pieces 21 are welded to the same tab 12. By making the two terminals 22 integrally formed with the two adapter pieces 21, the current carrying capacity of the adapter pieces 21 can be improved, thereby reducing the resistance in the current path during the charging and discharging process of the battery 100, reducing the temperature rise caused by resistance heating, and thus reducing the risk of local overheating and thermal runaway. In addition, since the two adapter pieces 21 are integrally formed with the two terminals 22, there is no need to control the manufacturing precision of the spacing between the two terminals 22. Therefore, this implementation method can reduce the manufacturing difficulty of the terminal assembly 20.

[0046] refer to Figure 9 The tab 12 extends from the cell body 11 along a first direction. The distance between the two terminals 22 in a second direction is D1, in mm, and D1 can satisfy: 20 ≤ D1 ≤ 45. For example, D1 can be 20, 22, 26, 32, 36, 38, 40, 42, or 45. The dimension of the tab 12 in the second direction is D2, in mm, and D2 can satisfy: 30 ≤ D2 ≤ 60. For example, D2 can be 30, 35, 40, 45, 50, 55, or 60. D1 / D2 can satisfy: 0.5 ≤ D1 / D2 ≤ 0.9. For example, D1 / D2 can be 0.5, 0.6, 0.7, 0.8, or 0.9. Preferably, D1 / D2 can satisfy: 0.6 ≤ D1 / D2 ≤ 0.8.

[0047] If the ratio of the distance between the two terminals 22 in the second direction to the dimension of the tab 12 in the second direction is too small, i.e., less than 0.5, then the dimension of the adapter piece 21 located between the two terminals 22 in the second direction will be smaller than the dimension of the tab 12 in the second direction. This will result in a smaller welding area 211 where the adapter piece 21 is welded to the tab 12, and a smaller current-carrying area for the adapter piece 21. As a result, during the charging and discharging process of the battery 100, the resistance in the current path will be larger, which may lead to localized overheating.

[0048] If the ratio of the distance between the two terminals 22 in the second direction to the dimension of the tab 12 in the second direction is too large, i.e., greater than 0.9, then the dimension of the adapter piece 21 in the second direction is larger than the dimension of the tab 12 in the second direction. This will increase the weight of the battery 100 and is detrimental to the energy density of the battery 100. On the other hand, when the tab 12 and the adapter piece 21 are resistively welded, if the dimension of the adapter piece 21 in the second direction is larger than the dimension of the tab 12 in the second direction, the quality of the weld points formed by stamping on the adapter piece 21 may be uneven. For example, the weld points located in the middle of the adapter piece 21 may have a larger dimension in the thickness direction, while the weld points located at the edge may have a smaller dimension in the thickness direction. This will cause the welding area of ​​the weld points located at the edge to have a poor weld after the tab 12 and the adapter piece 21 are welded, resulting in problems such as low welding quality and small welding area.

[0049] According to the battery 100 provided by this utility model, the ratio of the distance between the two pole posts 22 in the second direction to the size of the tab 12 in the second direction is limited to the above-mentioned numerical range. This can limit the size of the adapter piece 21 and the tab 12 in the second direction, so as to ensure the area of ​​the welding area 211 of the adapter piece 21 and the tab 12 and the current flow area of ​​the adapter piece 21, thereby avoiding the risk of local overheating during the operation of the battery 100. At the same time, it will not excessively increase the weight of the battery 100, thus ensuring the energy density of the battery 100.

[0050] It should be noted that D1 is the distance between the centers of the two pole posts 22 in the second direction. The center of the pole post 22 can be the geometric center of its orthographic projection along the thickness direction. For example, when the orthographic projection of the pole post 22 along the thickness direction is a circle, D1 is the distance between the centers of the two pole posts 22 in the second direction; when the orthographic projection of the pole post 22 along the thickness direction is a rectangle, D1 is the distance between the centroids of the two pole posts 22 in the second direction.

[0051] It is understood that there can be various welding methods for the tab 12 and the adapter piece 21, and this utility model does not impose any particular limitation on this. For example, the tab 12 and the adapter piece 21 can be welded by laser welding or ultrasonic welding.

[0052] refer to Figure 10 and Figure 12The distance in the thickness direction between the surfaces of one adapter piece 21 facing the tab 12 and the surface of the other adapter piece 21 facing the tab 12 is H, in mm. H can satisfy: 0.005 ≤ H ≤ 0.7. For example, H can be 0.005, 0.01, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, or 0.7. The thickness of the tab 12 is T, in mm. T can satisfy: 0.1 ≤ T ≤ 1.8. For example, T can be 0.1, 0.12, 0.18, 0.2, 0.6, 1.2, 1.5, or 1.8. H / T can satisfy: 0.003≤H / T≤1.2. For example, H / T can be 0.003, 0.005, 0.01, 0.1, 0.3, 0.5, 0.7, 0.9, 1.1 or 1.2. Preferably, H / T can satisfy: 0.1≤H / T≤0.9.

[0053] If the ratio of the distance in the thickness direction between the surfaces of one adapter piece 21 facing the tab 12 and the other facing the tab 12 to the thickness of the tab 12 is too small (less than 0.003), then the two adapter pieces 21 need to have a small error margin during processing, which places high demands on the processing accuracy of the two adapter pieces 21. If the ratio of the distance in the thickness direction between the surfaces of one adapter piece 21 facing the tab 12 and the other facing the tab 12 to the thickness of the tab 12 is too large (greater than 1.2), then the surfaces of one adapter piece 21 facing the tab 12 are located on two planes with a large height difference in the thickness direction. This will result in tight contact between the tab 12 and the surface of one adapter piece 21, but an excessive gap between the tab 12 and the surface of the other adapter piece 21. After welding the tab 12 and the two adapter pieces 21, incomplete welding is likely to occur, resulting in low welding quality and a small welding area.

[0054] It should be noted that the battery cell body 11 is formed by stacking or winding multiple positive electrode plates and multiple negative electrode plates. The tabs 12 include multiple positive tabs and multiple negative tabs. The multiple positive tabs extend from the multiple positive electrode plates, and the multiple negative tabs extend from the multiple negative electrode plates. The thickness of the tabs 12 refers to the total thickness of the multiple positive tabs after stacking, or the total thickness of the multiple negative tab units after stacking.

[0055] refer to Figure 9 The minimum distance between the two adapter pieces 21 in the second direction is D3, in mm, and D3 can satisfy: 1 ​​≤ D3 ≤ 12. For example, D3 can be 1, 2, 4, 6, 8, 10, or 12. D3 / D2 can satisfy: 0.04 ≤ D3 / D2 ≤ 0.25. For example, D3 / D2 can be 0.04, 0.08, 0.1, 0.12, 0.16, 0.18, 0.2, or 0.25. Preferably, D3 / D2 can satisfy: 0.1 ≤ D3 / D2 ≤ 0.2.

[0056] If the minimum distance between the two adapter pieces 21 in the second direction is too small, i.e., less than 0.04, the two adapter pieces 21 are prone to interference during assembly. If the minimum distance between the two adapter pieces 21 in the second direction is too large, i.e., greater than 0.25, this will result in a smaller welding area 211 where the adapter piece 21 is welded to the electrode tab 12. According to the battery 100 provided by this utility model, limiting the minimum distance between the two adapter pieces 21 in the second direction to the above-mentioned value range can both avoid interference between the two adapter pieces 21 during assembly and ensure the area of ​​the welding area 211 where the adapter piece 21 is welded to the electrode tab 12.

[0057] Continue to refer to Figure 9 Each adapter piece 21 has a first edge and a second edge located on opposite sides of the corresponding pole piece 22 in a second direction. The first edge is located between the two pole pieces 22, and the distance from the first edge to the corresponding pole piece 22 along the second direction is D4, in mm. D4 can satisfy: 10 ≤ D4 ≤ 35. For example, D4 ​​can be 10, 12, 16, 20, 24, 28, 32, or 35. The distance from the second edge to the corresponding pole piece 22 along the second direction is D5, in mm, and D5 can satisfy: 3 ≤ D5 ≤ 15. For example, D5 can be 3, 5, 7, 9, 10, 12, 14, or 15. D4 / D5 can satisfy: 1 ​​≤ D4 / D5 ≤ 6. For example, D4 / D5 can be 1, 2, 3, 4, 5, or 6. Preferably, D4 / D5 can satisfy: 2 ≤ D4 / D5 ≤ 4.

[0058] If the ratio of the distance from the first edge along the second direction to the corresponding terminal 22 to the distance from the second edge along the second direction to the corresponding terminal 22 is too small, i.e., less than 1, the size of the adapter piece 21 between the two terminals 22 will be small, which is not conducive to space utilization. If the ratio of the distance from the first edge along the second direction to the corresponding terminal 22 to the distance from the second edge along the second direction to the corresponding terminal 22 is too large, i.e., greater than 6, the distance between the two adapter pieces 21 in the second direction will be too small, which will cause the two adapter pieces 21 to interfere with each other during assembly. According to the battery 100 provided by this utility model, by limiting the ratio of the distance from the first edge along the second direction to the corresponding terminal 22 to the distance from the second edge along the second direction to the corresponding terminal 22 to the above-mentioned value range, the space between the two terminals 22 can be used to set the adapter piece 21, and the interference between the adapter pieces 21 during assembly can be avoided.

[0059] It should be noted that D4 is the distance from the first edge along the second direction to the center of the corresponding pole post 22. The center of the pole post 22 can be the geometric center of its orthographic projection along the thickness direction. For example, when the orthographic projection of the pole post 22 along the thickness direction is a circle, D4 ​​is the distance from the first edge along the second direction to the center of the circle of the corresponding pole post 22 in the second direction; when the orthographic projection of the pole post 22 along the thickness direction is a rectangle, D4 ​​is the distance from the first edge along the second direction to the centroid of the corresponding pole post 22 in the second direction.

[0060] It should be noted that D5 is the distance from the second edge along the second direction to the center of the corresponding pole post 22. The center of the pole post 22 can be the geometric center of its orthographic projection along the thickness direction. For example, when the orthographic projection of the pole post 22 along the thickness direction is a circle, D5 is the distance from the second edge along the second direction to the center of the circle of the corresponding pole post 22 in the second direction; when the orthographic projection of the pole post 22 along the thickness direction is a rectangle, D5 is the distance from the second edge along the second direction to the centroid of the corresponding pole post 22 in the second direction.

[0061] refer to Figure 11 and Figure 12 The electrode assembly 20 also includes an insulating element 41 and a conductive element 50. The insulating element 41 is at least partially disposed in the second receiving portion 332. The insulating element 41 has a connection space 413, an electrode tab insertion port 411 and two electrode protrusion ports 412. The electrode tab 12 extends into the connection space 413 through the electrode tab insertion port 411. The adapter piece 21 is disposed in the connection space 413 and is welded to the electrode tab 12.

[0062] Combination Figure 7 The cover plate 32 has two through holes 322, and the two pole posts 22 correspond to the two pole post protrusions 412 and the two through holes 322 respectively. Each pole post 22 extends out of the housing 30 through the corresponding pole post protrusion 412 and the corresponding through hole 322. The conductive element 50 is located outside the housing 30 and connected to the two pole posts 22.

[0063] It should be understood that there are multiple ways to implement the battery of this utility model, and it should not be construed as being limited to the embodiments described above. The following, in conjunction with... Figure 13 Another embodiment of the present invention will be illustrated below. It should be noted that the foregoing embodiments and the following embodiments share some common elements. In the following embodiments, these elements will use the same reference numerals as in the foregoing embodiments to omit repeated descriptions.

[0064] refer to Figure 13 In another embodiment of this utility model, the electrode assembly 20 includes two electrodes 22, which are integrally formed with the same adapter piece 21a. In this way, the adapter piece 21a can provide a larger welding area for the tab 12, thereby increasing the welding area of ​​the tab 12 and the flow area of ​​the adapter piece 21a.

[0065] It should be understood that the term "comprising" and its variations used in this utility model are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0066] It should be understood that although terms such as "first" or "second" may be used in this invention to describe various elements (such as the first receiving portion and the second receiving portion), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0067] The scope of protection of this utility model is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A battery (100), characterized in that, include: Battery cell (10), the battery cell (10) comprising a battery cell body (11) and tabs (12) extending from the battery cell body (11); and The electrode assembly (20) includes an adapter plate (21) and an electrode post (22). The adapter plate (21) is stacked with the electrode tab (12). The surface of the adapter plate (21) facing the electrode tab (12) has a welding area (211) for welding with the electrode tab (12). The electrode post (22) is located on the side of the adapter plate (21) facing away from the electrode tab (12) and is integrally formed with the adapter plate (21). Wherein, the orthographic projection of the pole post (22) along the thickness direction of the tab (12) at least partially overlaps with the orthographic projection of the welding area (211) along the thickness direction.

2. The battery (100) according to claim 1, characterized in that, The pole assembly (20) includes two adapter pieces (21) and two poles (22), the two adapter pieces (21) are integrally formed with the two poles (22), and the two adapter pieces (21) are welded to the same tab (12).

3. The battery (100) according to claim 2, characterized in that, The tab (12) extends from the cell body (11) along the first direction, the distance between the two poles (22) in the second direction is D1, in mm, the size of the tab (12) in the second direction is D2, in mm, 0.5≤D1 / D2≤0.9, and the first direction, the second direction and the thickness direction are perpendicular to each other.

4. The battery (100) according to claim 3, characterized in that, The distance between the surface of one of the two adapter pieces (21) facing the tab (12) and the surface of the other facing the tab (12) in the thickness direction is H, in mm. The thickness of the tab (12) is T, in mm, and 0.003≤H / T≤1.

2.

5. The battery (100) according to claim 3, characterized in that, The minimum distance between the two adapter pieces (21) in the second direction is D3, in mm, and 0.04≤D3 / D2≤0.

25.

6. The battery (100) according to claim 2, characterized in that, Each adapter piece (21) has a first edge and a second edge located on opposite sides of the corresponding pole (22) in a second direction. The tab (12) extends from the cell body (11) in a first direction. The first direction, the second direction and the thickness direction are perpendicular to each other. The first edge is located between the two poles (22). The distance from the first edge to the corresponding pole (22) along the second direction is D4, and the distance from the second edge to the corresponding pole (22) along the second direction is D5. 1≤D4 / D5≤6.

7. The battery (100) according to claim 1, characterized in that, The pole assembly (20) includes two poles (22), which are integrally formed with the same adapter piece (21).

8. The battery (100) according to claim 1, characterized in that, The cell (10) includes two tabs (12), which extend from opposite ends of the cell body (11), and the battery (100) includes two terminal assemblies (20) corresponding to the two tabs (12).

9. The battery (100) according to claim 8, characterized in that, It also includes a housing (30), which includes a receiving shell (31) and a cover plate (32). The receiving shell (31) has a raised portion (311) that protrudes toward the side opposite to the cover plate and an edge portion (312) surrounding the raised portion (311). The cover plate (32) mates with the receiving shell (31) along the thickness direction to form a receiving space (33) with the raised portion (311), and connects with the edge portion (312) to form a sealing portion (321) that surrounds and closes the receiving space (33). The electrode tab (12) extends from the cell body (11) along a first direction. The first direction is perpendicular to the thickness direction. The accommodating space (33) includes a first accommodating portion (331) and two second accommodating portions (332). The two second accommodating portions (332) are located on opposite sides of the first accommodating portion (331) in the first direction. The size of the first accommodating portion (331) in the thickness direction is larger than the size of each second accommodating portion (332) in the thickness direction. The cell body (11) is disposed in the first accommodating portion (331). The two terminal assemblies (20) are respectively at least partially disposed in the two second accommodating portions (332).

10. The battery (100) according to claim 9, characterized in that, The electrode assembly (20) further includes an insulating element (41) and a conductive element (50). The cover plate (32) has two through holes (322). The insulating element (41) is at least partially disposed in the second receiving portion (332). The insulating element (41) has a connection space (413), an electrode tab inlet (411), and two electrode protrusions (412). The electrode tab (12) extends into the connection space (413) through the electrode tab inlet (411). The adapter piece (21) is disposed on the connection space. The electrode assembly (20) is welded to the tab (12) in the space (413). The electrode assembly (20) includes two electrodes (22). The two electrodes (22) correspond to the two electrode protrusions (412) and the two through holes (322) respectively. Each electrode (22) extends out of the housing (30) through the corresponding electrode protrusion (412) and the corresponding through hole (322) in sequence. The conductive element (50) is disposed outside the housing (30) and connected to the two electrodes (22).

11. A battery pack (200), characterized in that, Includes the battery (100) as described in any one of claims 1 to 10.

12. An electrical appliance (300), characterized in that, Includes the battery (100) of any one of claims 1 to 10; or includes the battery pack (200) of claim 11.

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