A battery pack, a battery group, and a battery

Abstract

The utility model relates to new energy battery technical field discloses a kind of battery pack, battery pack and battery, its battery includes: electric core body and tab, the tab is set in the electric core body at least one end along first direction, the tab includes several layers tab layer, each the tab layer is stacked along second direction arrangement, the first direction with The second direction each other perpendicular, at least two pieces the length of tab layer in the first direction is not equal, and each the tab layer in the first direction end of the electric core body is corner and is set as fillet;Wherein, the radius of the fillet is R mm, satisfy:2≤R≤20.The utility model after tab welding, without needing to cut tab as a whole, can improve the problem of wrong layer, guarantee the effective welding area of tab, prevent tab from appearing curling defect simultaneously, will also reduce the generation of scrap, reduce the adverse effect on battery safety and performance.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a battery pack, battery group and battery. Background Technology

[0002] During battery production, after stacking or winding the electrode sheets, the tabs are welded and cut as a whole to ensure the dimensional accuracy and connection reliability of the tabs. Since the positions of the tabs on each layer are different and there are many layers of tabs, misalignment can easily occur when welding or bending the tabs. To ensure effective connection of the tabs, a larger size tab is usually reserved when manufacturing the tab sheet, and then it is welded and cut as a whole.

[0003] However, cutting generates debris, which can easily fall into the interlayer gaps or winding cavities of the battery cell. This debris may puncture the separator, causing internal short circuits and thermal runaway risks, which are detrimental to battery safety. Moreover, the debris undergoes chemical reactions in the electrolyte, generating byproducts that affect ion conduction efficiency and thus reduce rate performance and battery performance. Utility Model Content

[0004] The purpose of this invention is to provide a battery pack, battery assembly, and battery in which the tabs no longer need to be cut as a whole, reducing the generation of debris and minimizing the adverse effects on battery safety and performance.

[0005] To achieve the above objectives, this utility model provides a battery, comprising:

[0006] A battery cell includes a cell body and tabs. The tabs are disposed at at least one end of the cell body along a first direction. The tabs include a plurality of tab layers, and each tab layer is stacked along a second direction. The first direction and the second direction are perpendicular to each other. At least two tab layers have unequal lengths in the first direction, and the corners of each tab layer at the end away from the cell body in the first direction are rounded.

[0007] The radius of the fillet is R mm, which satisfies: 2≤R≤20.

[0008] This utility model also provides a battery pack, including at least two batteries as described above, each of which is electrically connected to the other.

[0009] This utility model also provides a battery pack, including a housing and at least two battery packs as described above, each of the battery packs being disposed within the housing and electrically connected to each other.

[0010] This utility model provides a battery pack, a battery assembly, and a battery. Compared with the prior art, its advantages are as follows:

[0011] The battery of this utility model includes a cell body and tabs. The tabs include tab layers stacked along a second direction. The lengths of the tab layers are not completely equal in a first direction. The corners of the tab layers at the end away from the cell body are rounded. With the size of the rounded corners limited, the problem of mis-layering can be improved without cutting the tabs as a whole after welding, ensuring the effective welding area of ​​the tabs. At the same time, it prevents the tabs from curling and reduces the generation of debris, thus reducing the adverse effects on battery safety and performance.

[0012] The battery pack of this utility model, including the battery described above, can improve the problem of misalignment without cutting the tabs as a whole after the tabs are welded, ensure the effective welding area of ​​the tabs, prevent the tabs from curling, reduce the generation of debris, and reduce the adverse effects on battery safety and performance.

[0013] The battery pack of this utility model, including the battery pack described above, can improve the problem of misalignment without cutting the tabs as a whole after the tabs are welded, ensure the effective welding area of ​​the tabs, prevent the tabs from curling, reduce the generation of debris, and reduce the adverse effects on battery safety and performance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the battery structure according to an embodiment of the present invention.

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

[0016] Figure 3 This is a schematic diagram of the battery cell body and the electrode tabs according to an embodiment of this utility model.

[0017] Figure 4 This is a schematic diagram of the first and second electrodes of an embodiment of this utility model.

[0018] Figure 5 This is a schematic diagram of the reinforcing rib of the electrode lug in an embodiment of this utility model.

[0019] Figure 6 This is a schematic diagram of the direct connection between the pole post and the pole tab in an embodiment of this utility model.

[0020] Figure 7 This is a schematic diagram of an embodiment of the present invention where a tab is connected to an adapter plate.

[0021] Figure 8 This is a schematic diagram of another embodiment of the present invention where the electrode tab is connected to the adapter plate.

[0022] In the diagram, 100 is the battery; 1 is the battery cell; 2 is the terminal post; 3 is the adapter piece; 11 is the battery cell body; 12 is the tab; 111 is the second edge; 121 is the tab layer; 121a is the first tab; 121b is the second tab; 1211 is the first edge; and 1212 is the reinforcing rib.

[0023] Z, first direction; Y, second direction; X, third direction. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Please refer to Figure 1-3 A battery according to an embodiment of the present invention includes a battery cell 1.

[0030] The battery cell 1 includes a cell body 11 and a tab 12.

[0031] The battery cell body 11 includes a separator and two types of electrodes with opposite polarities, namely a positive electrode and a negative electrode. The electrode assembly operates by the movement of metal ions between the positive and negative electrodes. The cycling process of the battery cell 1 is the process of metal ions moving from the positive electrode to the negative electrode and then from the negative electrode to the positive electrode.

[0032] The positive electrode sheet includes a positive current collector and a positive active material. The positive current collector can be made of metal materials such as aluminum foil, nickel foil, and stainless steel, or a composite foil formed by combining metal and insulating materials. The positive active material includes the positive active material, conductive agent, binder, etc. The 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.

[0033] Similarly, the negative electrode sheet includes a negative current collector and a negative active material. The negative current collector can be made of metal materials such as copper foil, aluminum foil, and stainless steel, or it can be a composite foil material formed by combining metals and insulating materials. The negative active material includes the negative active material, conductive agent, binder, etc. The negative active material includes one or more of the following: artificial graphite, natural graphite, silicon carbide, silicon oxide, lithium titanate, etc.

[0034] The tab 12 is disposed at at least one end of the cell body 11 along the first direction Z. The tab 12 includes several tab layers 121, and each tab layer 121 is stacked along the second direction Y. The first direction Z and the second direction Y are perpendicular to each other. At least two tab layers 121 have different lengths in the first direction Z, and the corners of the end of each tab layer 121 away from the cell body 11 in the first direction Z are rounded.

[0035] The tab 12 serves as the current output terminal of the battery cell 1. The material of the tab 12 can be metal materials such as copper foil, aluminum foil, and stainless steel, or it can be a composite tab 12 formed by combining metal and insulating materials.

[0036] The tab 12 refers to the overall structure including each tab layer 121.

[0037] Please refer to Figure 2 and Figure 3 When the tab layers 121 are welded together, the tabs 12 will bend. The paths of the tab layers 121 located at different positions are different. The tab layers 121 that are farther away will have a larger part used in the path compared to the tab layers 121 that are closer. The effective contact area with other tab layers 121 is smaller, and the effective welding area is also smaller, which will affect the effective connection of the tabs 12.

[0038] At least two tab layers 121 are configured with unequal lengths in the first direction Z. This means that some tab layers 121 can have equal lengths in the first direction Z, but all tab layers 121 must have unequal lengths in this direction. Since tab layers 121 are often bent in actual battery products, the length of the tab layer 121 in the first direction Z refers to its unfolded length. The different lengths of the tab layers 121 in the first direction Z allow tab layers 121 in different positions and with different bending paths to be matched with appropriate dimensions to ensure effective contact with other tab layers 121, i.e., to ensure an effective welding area.

[0039] This structure can compensate for dimensional differences that occur after welding or bending by using different sizes, thereby improving the degree of misalignment, concentrating the effective welding area of ​​the tab 12, ensuring the effective working area of ​​the tab 12, and thus ensuring the effective connection of the tab 12.

[0040] In actual production, the top surface of the tab layer 121 often has square corners. During the stacking or winding of the cell body 11, because the individual tab layer 121 is relatively thin, it is prone to folding, wrinkling, and curling during processing. This results in a decrease in the welding area and welding quality when the tab layer 121 is finally welded to form the tab 12, leading to a reduction in the current transmission capacity of the cell itself and a decrease in cell performance. In extreme cases, the folded tab layer 121 may be inserted upside down into the cell body 11, causing a short circuit in the cell and creating a safety hazard.

[0041] Compared to a rounded corner design, the square corners of the tab layer 121 are more prone to folding. Folding, wrinkling, and curling can lead to weakened weld strength and compromised weld quality when the tab layer 121 is welded to form the tab 12. Therefore, after experimental testing, the square corners at the top of the tab layer 121 were changed to rounded corners. Rounded corners are now incorporated into all tab layers 121 to prevent edge curling and maintain battery performance. However, compared to the original square corners, the weldable area of ​​the rounded-corner tab layer 121 is somewhat reduced, especially in cases of misalignment within the tab layer 121.

[0042] Therefore, after welding, the effective welding area of ​​the tab 12 is actually a part of the overlapping area of ​​all tab layers 121. Thus, the effective welding area is determined by the shape and size of a certain tab layer 121 in the tab 12, and the edge shape of this tab layer 121 is closest to the edge shape of the effective welding area.

[0043] Please refer to Figure 5The radius of the fillet is R mm, satisfying: 2 ≤ R ≤ 20. Optionally, R can take values ​​of 2, 5, 10, 15, 20, etc. If the radius of the fillet is too small, the strengthening effect on the tab layer 121 itself will be insignificant, and the top corner will still be prone to bending. However, if the radius of the fillet is too large, it will affect the size of the welding area, which is not conducive to the effective connection of the tab 12. Therefore, satisfying the above range can both prevent the tab layer 121 from developing curled edges and ensure an effective welding area.

[0044] Furthermore, for cell 1 and the battery assembled with cell 1, there are usually preset specifications and dimensions. With the length of the tab layer 121 leading out of the cell body 11 remaining unchanged, the size of R determines how much area needs to be removed from the corner area of ​​the tab layer 121 compared to the original square corner. In actual production, the hot-press welding head used for welding is generally rectangular, so the final weld mark is also rectangular. The rounded corner design limits the original weldable area, requiring the welding area to be appropriately reduced in width to avoid the rounded corner. However, after reduction, the reduced welding area decreases the cell's current carrying capacity. Therefore, this embodiment sets the tab 12 to have different lengths in the first direction Z, and sets a rounded corner at the end of the tab 12 away from the cell body 11. Combined with the size limitation of the rounded corner, after welding the tab 12, there is no need to cut the tab 12 as a whole, which can improve the problem of misalignment, ensure the effective welding area of ​​the tab 12, prevent the tab 12 from having rolled edges, reduce the generation of debris, and reduce the adverse effects on battery safety and performance.

[0045] When measuring R, any tab layer 121 can be selected, and the fillet radius can be measured using general measuring tools such as fillet gauges. The average value is taken after multiple measurements.

[0046] In some embodiments, please refer to Figure 4 The tab 12 includes a first tab 121a and a second tab 121b. Both the first tab 121a and the second tab 121b include at least two tab layers 121. In the first direction Z, the length of the first tab 121a is greater than that of the second tab 121b.

[0047] The radius of the rounded corner of the first tab 121a is R1 mm, and the radius of the rounded corner of the second tab 121b is R2 mm, satisfying: 4≤R1≤20, 2≤R2≤15.

[0048] Optionally, R1 can take values ​​of 4, 6, 9, 12, 16, 20, etc., and R2 can take values ​​of 2, 3, 7, 10, 11, 15, etc.

[0049] For tab layer 121, the size of tab layer 121 in the first direction Z affects whether tab layer 121 is prone to curling defects. Therefore, the radius of the rounded corner can be defined for tab layers 121 of different sizes.

[0050] The first tab 121a is longer and has a greater risk of curling defects. Therefore, R1 is limited to meet the above range to better adapt to the situation of the first tab 121a.

[0051] The second tab 121b is shorter, and its impact on the effective welding area is greater than that of the first tab 121a. Therefore, R2 is limited to meet the above range in order to better adapt to the situation of the second tab 121b.

[0052] When measuring R1, any tab layer 121 of the first tab 121a can be taken, and the fillet radius can be measured using a common measuring tool such as a fillet gauge. The average value is taken after multiple measurements.

[0053] When measuring R2, any tab layer 121 of the second tab 121b can be selected, and the fillet radius can be measured using a common measuring tool such as a fillet gauge. The average value is taken after multiple measurements.

[0054] In some embodiments, the length of the tab layer 121 in the third direction X gradually decreases along the lead-out direction of the tab 12 in the first direction Z. Specifically, at least one edge of the tab layer 121 in the third direction X is designated as the first edge 1211, and the edge of the cell body 11 connecting to the tab 12 is designated as the second edge 111. The angle between the straight lines containing the first edge 1211 and the second edge 111 is A° and A≠90°, such that in the direction from the cell body 11 to the tab 12 in the first direction Z, the length of the tab layer 121 in the third direction X gradually decreases, and also satisfies: 2≤R≤17.

[0055] Optionally, R can take values ​​of 2, 5, 8, 13, 17, etc.

[0056] The third direction X, the first direction Z, and the second direction Y are all perpendicular to each other.

[0057] In this embodiment, since a square battery is used as an example, the first direction Z is the height direction of the battery, the second direction Y is the thickness direction of the battery, and the third direction X is the length direction of the battery.

[0058] The first edge 1211 is inclined relative to the second edge 111, which will affect the specific shape of the tab layer 121. The shape of the tab layer 121 will also affect the size of the effective welding area. Therefore, R is limited to the above range to ensure the effective welding area under this tab 12 shape, while also preventing the tab 12 from having curling defects.

[0059] In some embodiments, the corners of each tab layer 121 connected to one end of the cell body 11 in the first direction Z are chamfered.

[0060] The chamfer can be either a rounded corner or a right angle, and it improves the distribution of stress or tension on the tab layer 121 itself, thereby reducing the defect of the tab layer 121 folding.

[0061] In some embodiments, please refer to Figure 6 The battery also includes a terminal post 2, which is connected to the cell body 11 via a tab 12, and also satisfies: 4≤R≤20.

[0062] Optionally, R can take values ​​of 4, 9, 10, 15, 19, 20, etc.

[0063] Terminal 2 serves as the current output terminal of the battery. The current output of cell 1 is electrically connected to terminal 2, and terminal 2 is electrically connected to adjacent batteries, realizing series and parallel connections between batteries. The materials of terminal 2 include metals such as aluminum, aluminum alloy, copper, nickel, and copper-aluminum alloy.

[0064] When tab 12 is directly connected to pole post 2, the connection position of tab 12 and pole post 2, as well as the bending condition of tab 12, need to match a certain effective welding area. By limiting R to meet the above range, tab 12 can satisfy the effective welding area requirement under this connection method.

[0065] In some embodiments, please refer to Figure 7 The battery also includes an adapter plate 3, which is disposed on one side of the cell body 11 in the first direction Z, and at least a portion of the tab 12 covers and is connected to the surface of the adapter plate 3 facing the cell body 11, and satisfies: 3≤R≤20.

[0066] Optionally, R can take values ​​of 3, 7, 12, 16, 20, etc.

[0067] For batteries in this situation, the adapter 3 is a key transitional component connecting the tab 12 and the terminal 2. When the tab 12 and the terminal 2 cannot be directly and stably connected, the adapter 3 is connected to the tab 12 and the terminal 2 respectively by welding or other means, playing the role of a "bridge": on the one hand, it collects the current output from the tab 12, and on the other hand, it stably conducts the current to the terminal 2, ultimately realizing the electrical connection between the internal and external circuits of the cell 1.

[0068] The tab 12 is connected to the adapter plate 3, and the tab 12 is bent on the side of the adapter plate 3 facing the cell body 11. In this case, the connection position of the tab 12 and the adapter plate 3 and the bending condition of the tab 12 need to match a certain effective welding area. Limiting R to meet the above range allows the tab 12 to meet the effective welding area requirements under this connection method.

[0069] In some embodiments, please refer to Figure 8The battery also includes an adapter plate 3, which is disposed on one side of the cell body 11 in the first direction Z. The tab 12 is bent to the side of the adapter plate 3 away from the cell body 11, and at least part of the tab 12 covers and is connected to the surface of the adapter plate 3 away from the cell body 11. It also satisfies: 3.5≤R≤20.

[0070] Optionally, R can take values ​​of 3.5, 7, 10, 14, 18, 20, etc.

[0071] The tab 12 is connected to the adapter plate 3. The tab 12 needs to be bent around the adapter plate 3 and connected to the side of the adapter plate 3 away from the cell body 11. In this connection method, the connection position of the tab 12 and the adapter plate 3 and the bending condition of the tab 12 need to match a certain effective welding area. Limiting R to meet the above range allows the tab 12 to meet the effective welding area requirements under this connection method.

[0072] In some embodiments, please refer to Figure 4 The length of the tab layer 121 in the third direction X is d mm. The third direction X, the second direction Y and the first direction Z are perpendicular to each other, and also satisfy: 10≤d≤180, 2≤R≤15.

[0073] Optionally, d can take values ​​of 10, 27, 32, 55, 68, 79, 81, 95, 111, 135, 157, 162, 180, etc., and R can take values ​​of 2, 4, 5, 9, 12, 15, etc.

[0074] The length of the tab layer 121 in the third direction X affects the overall area of ​​the tab layer 121, thereby affecting the size of the effective welding area. Therefore, d and R are limited to the above range to ensure the effective welding area under this tab 12 shape while preventing the tab 12 from having rolled edge defects.

[0075] When measuring d, any tab layer 121 can be selected, and the distance between the two edges of the tab layer 121 in the third direction X can be measured using a ruler or other common measuring tools. The average value is taken after multiple measurements.

[0076] In some embodiments, please refer to Figure 5 The tab layer 121 is provided with reinforcing ribs 1212, and also satisfies: 2≤R≤14.

[0077] Optionally, R can take values ​​of 2, 5, 7, 13, 14, etc.

[0078] The reinforcing rib 1212 can be a circular protrusion, a polygonal protrusion, or other structure that protrudes from the surface of the tab layer 121. The number and position of the reinforcing rib 1212 can be set according to actual needs.

[0079] The reinforcing ribs 1212 on the tab layer 121 can improve the structural strength of the tab 12 itself, so that the tab 12 has a stronger ability to resist curling. The range R is defined above, which can match the tab layer 121 with this structure.

[0080] In some embodiments, the length of the tab 12 in the second direction Y is t mm, and the length of the cell body 11 in the second direction Y is T mm, satisfying: 40% ≤ t / T < 100%.

[0081] Optionally, t / T can be 40%, 60%, 75%, 83%, 99%, etc.

[0082] The length of the tab 12 in the second direction Y is the thickness of the tab 12, which is the product of the thickness of a single layer of the tab layer 121 and the number of layers of the tab layer 121.

[0083] The different lengths of the tab layers 121 in the first direction Z stem from the different bending paths of each tab layer 121. The thickness of the cell body 11 directly affects the position and bending path of each tab layer 121. Therefore, batteries with tab layers 121 of different sizes have certain requirements on the thickness of the tabs 121 and the cell body 11. When t / T meets the above range, it can accommodate batteries with different lengths of tab layers 121 in the first direction Z.

[0084] It can also satisfy: 8≤t≤70, and t can take values ​​of 8, 22, 35, 51, 66, 70, etc.

[0085] This embodiment also provides a battery pack including at least two batteries as described above, each battery being electrically connected to the others. After the tabs 12 are welded, there is no need to cut the tabs 12 as a whole, which can improve the problem of misalignment, ensure the effective welding area of ​​the tabs 12, prevent the tabs 12 from having rolled edges, reduce the generation of debris, and reduce the adverse effects on battery safety and performance.

[0086] This embodiment also provides a battery pack, including a housing and at least two battery packs as described above, each battery pack being disposed within the housing and electrically connected to each other. After the tabs 12 are welded, there is no need to cut the tabs 12 as a whole, which can improve the problem of misalignment, ensure the effective welding area of ​​the tabs 12, prevent the tabs 12 from having rolled edges, reduce the generation of debris, and reduce the adverse effects on battery safety and performance.

[0087] In summary, this utility model embodiment provides a battery pack, a battery assembly, and a battery. The battery includes a cell body 11 and tabs 12. Each tab 12 includes tab layers 121 stacked along a second direction Y. The lengths of the tab layers 121 along a first direction Z are not entirely equal. The corners of the tab layers 121 at the end furthest from the cell body 11 are rounded. By limiting the size of the rounded corners, the problem of misalignment can be improved after the tabs 12 are welded without requiring overall cutting, ensuring the effective welding area of ​​the tabs 12. This also prevents the tabs 12 from developing curled edges, reduces debris generation, and minimizes adverse effects on battery safety and performance. Battery packs and battery assemblies using this battery also possess the beneficial effects of the aforementioned battery.

[0088] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery, characterized in that, include: A battery cell includes a cell body and tabs. The tabs are disposed at at least one end of the cell body along a first direction. The tabs include a plurality of tab layers, and each tab layer is stacked along a second direction. The first direction and the second direction are perpendicular to each other. At least two tab layers have unequal lengths in the first direction, and the corners of each tab layer at the end away from the cell body in the first direction are rounded. The radius of the fillet is R mm, which satisfies: 2 ≤ R ≤ 20.

2. The battery according to claim 1, characterized in that: The electrode includes a first electrode and a second electrode, both of which include at least two electrode layers. In the first direction, the length of the first electrode is greater than that of the second electrode. The radius of the rounded corner of the first electrode is R1mm, and the radius of the rounded corner of the second electrode is R2mm, satisfying: 4 ≤ R1 ≤ 20, 2 ≤ R2 ≤ 15.

3. The battery according to claim 1, characterized in that: Along the lead-out direction of the tab in the first direction, the length of the tab layer gradually decreases in the third direction, and also satisfies: 2≤R ≤17; The third direction, the first direction, and the second direction are all perpendicular to each other.

4. The battery according to claim 1, characterized in that: Each of the tab layers has a chamfered corner at one end of its connection to the cell body in the first direction.

5. The battery according to claim 1, characterized in that, Also includes: The electrode post, which is connected to the battery cell body through the electrode tab, also satisfies: 4≤R ≤20.

6. The battery according to claim 1, characterized in that, Also includes: An adapter piece is disposed on one side of the battery cell body in the first direction, and at least a portion of the tab covers and is connected to the surface of the adapter piece facing the battery cell body, and also satisfies: 3≤R ≤20.

7. The battery according to claim 1, characterized in that, Also includes: An adapter piece is disposed on one side of the battery cell body in the first direction. The tab is bent to the side of the adapter piece away from the battery cell body, and at least a portion of the tab covers and is connected to the surface of the adapter piece away from the battery cell body. It also satisfies: 3.5 ≤ R ≤ 20.

8. The battery according to claim 1, characterized in that: The length of the tab layer in the third direction is d mm. The third direction, the second direction, and the first direction are perpendicular to each other, and also satisfy: 10 ≤ d ≤ 180, 2 ≤ R ≤ 15.

9. The battery according to claim 1, characterized in that: The tab layer is provided with reinforcing ribs and also satisfies: 2≤ R ≤14.

10. The battery according to claim 1, characterized in that: The length of the electrode tab in the second direction is t mm, and the length of the cell body in the second direction is T mm, satisfying: 40% ≤ t / T < 100%.

11. A battery pack, characterized in that, It includes at least two batteries as described in any one of claims 1-10, wherein each battery is electrically connected to the other.

12. A battery pack, characterized in that, It includes a housing and at least two battery packs as described in claim 11, each of the battery packs being disposed within the housing and electrically connected to each other.

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