Battery cell, battery and electric equipment

Abstract

The utility model discloses a battery cell, a battery and electric equipment. The battery cell comprises a battery cell body, the n tab groups with the same polarity are arranged at the same end of the battery cell body and are staggered along the width direction of the battery cell body, and n is a positive integer greater than or equal to 2; the tab group comprises a plurality of current collector tabs; the battery cell also meets the following relational expression: w is the width of the tab group, I is the maximum continuous charging and discharging current of the battery cell, M is the number of pole pieces with the same polarity as the tab group, and h is the thickness of the current collector tab. An integral tab group in the related technology is divided into n mutually independent and staggered tab groups along the width direction of the battery cell body, so that the thickness of the tab groups is reduced, the space between the battery cell and the end cover of the battery shell is saved, the volume utilization rate of the battery cell is improved, and the capacity and energy density of the battery cell are improved. The battery cell is compact in structure, and collision of the battery cell in the battery cell manufacturing process is avoided. The number of welding layers of the current collector tab can be reduced, and the welding risk of the high-capacity multi-layer current collector tab is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery structure, and more specifically, to a battery cell. In addition, the present invention also relates to a battery including the battery cell and an electrical device including the battery. Background Art

[0002] Batteries play an important role in various electrical devices. For example, as a power source for new energy vehicles, batteries are widely used.

[0003] A battery includes a cell, which includes multiple layers of electrode sheets. Current collectors are located at the ends of the electrode sheets. After the electrode sheets are stacked or wound into a cell, the current collectors of all the positive electrode sheets are welded together to form a positive electrode tab, and the current collectors of all the negative electrode sheets are welded together to form a negative electrode tab. In related art, because the current collectors of all the positive electrode sheets are neatly arranged together, that is, overlapping along the width of the cell, the thickness of the current collectors of all the positive or negative electrode sheets after welding is relatively thick. This results in a larger space between the cell and the end cap of the battery casing, resulting in significant space waste. This in turn reduces the volume utilization of the cell within the battery, reducing the cell's capacity and energy density.

[0004] Therefore, how to improve the volume utilization of the battery cell inside the battery and increase the capacity and energy density of the battery cell is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, an object of the present invention is to provide a battery cell with high volume utilization inside the battery and large capacity and energy density.

[0006] Another object of the present invention is to provide a battery comprising the above-mentioned battery cell, wherein the volume utilization rate of the battery cell inside the battery is high, thereby improving the capacity and energy density of the battery.

[0007] Another object of the present invention is to provide an electrical device comprising the battery, wherein the battery has a large capacity and energy density.

[0008] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0009] A battery cell, comprising:

[0010] Battery cell body;

[0011] n tab groups with the same polarity are arranged at the same end of the battery cell body and staggered along the width direction of the battery cell body, where n is a positive integer ≥ 2; the tab group includes a plurality of current collector tabs;

[0012] The battery cell also satisfies the following relationship:

[0013]

[0014] Among them, w is the width of the tab group, I is the maximum continuous charge and discharge current of the battery cell, M is the number of pole pieces with the same polarity as the tab group, and h is the thickness of the current collector tab.

[0015] Optionally, the value range of I is 10~300A; the value range of M is 10~200; and the value range of w is 5~80mm.

[0016] Optionally, the current collector tab is made of copper foil, and the value range of h is 3-12 μm.

[0017] Optionally, the battery cell satisfies the following relationship:

[0018]

[0019] The material of the current collector tab is aluminum foil, and the value range of h is 7-16 μm.

[0020] Optionally, the relationship that n needs to satisfy is:

[0021]

[0022] Wherein, b is the width of the battery cell body.

[0023] Optionally, the number of current collector tabs in each of the tab groups is the same.

[0024] Optionally, the battery cell includes:

[0025] n1 positive electrode tab groups are provided at one end of the battery cell body and staggered along the width direction of the battery cell body, where n1 is a positive integer ≥ 2; and / or,

[0026] n2 negative electrode tab groups are provided at one end of the battery cell body and staggered along the width direction of the battery cell body, where n2 is a positive integer ≥2.

[0027] Optionally, the positive electrode tab group and the negative electrode tab group are respectively located at two ends of the battery cell body; or, the positive electrode tab group and the negative electrode tab group are located at the same end of the battery cell body.

[0028] A battery comprising:

[0029] Any of the above battery cells;

[0030] The battery cell is arranged in the shell, the shell is provided with a pole, and the tab group of the battery cell is connected to the pole.

[0031] Optionally, the n tab groups are connected to the pole by the same adapter sheet.

[0032] The sum of the widths of the n tab groups is less than or equal to the width of the adapter sheet, which is less than or equal to the width of the shell.

[0033] A battery including any of the above batteries.

[0034] The battery cell has the following beneficial effects:

[0035] In the related art, one integral tab is divided into n tab groups that are independent and staggered along the width direction of the battery cell body. The number of current collectors in each tab group is less than the number of current collectors in the integral battery cell body. The sum of the number of current collectors in the n tab groups is equal to the number of current collectors in the integral battery cell body. Since the thickness of the tab group is equal to the sum of the thickness of all the current collectors forming the tab group and the welding thickness of the current collectors, the number of current collectors included in the tab group is reduced after the integral tab is divided into n tab groups with the same polarity. The thickness of the tab group is reduced, and the thickness of all the current collectors forming the tab group and the welding thickness of the current collectors are reduced, thereby reducing the thickness of the tab group.

[0036] The thickness of the tab group is reduced, thereby reducing the space between the battery cell and the shell end cover of the battery. The space between the battery cell and the shell end cover of the battery is saved, which is beneficial to increasing the length of the battery cell body, improving the volume utilization of the battery cell in the battery, and improving the mass of active substances in the battery cell, thereby improving the capacity and energy density of the battery cell. In addition, this structure is also beneficial to strengthening the compactness of the battery cell structure and avoiding the risk of collision of the battery cell during the winding or stacking process. Further, after the integral tab group is divided into n tab groups with the same polarity, the number of welding layers of the current collector of the tab group can be reduced, thereby reducing the welding risk of the large-capacity multi-layer current collector tab group.

[0037] The battery provided by the utility model has the same beneficial effects as the battery cell.

[0038] The battery provided by the utility model has the same beneficial effects as the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the related art, the drawings needed in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the utility model, and those skilled in the art can obtain other drawings according to the provided drawings without creating any creative labor.

[0040] Figure 1 A schematic structural diagram of a battery provided in a specific embodiment of the present invention (one end of the battery cell includes two tab groups with the same polarity);

[0041] Figure 2 Schematic diagram of the structure of the first pole piece group;

[0042] Figure 3 Schematic diagram of the structure of the second pole piece group;

[0043] Figure 4 A schematic structural diagram of a battery provided in another specific embodiment of the present invention (one end of the battery cell includes four tab groups with the same polarity);

[0044] Figure 5 Schematic diagram of the structure of the third pole piece group;

[0045] Figure 6 Schematic diagram of the structure of the fourth pole piece group;

[0046] Figure 7 Schematic diagram of the structure of the fifth pole piece group;

[0047] Figure 8 Schematic diagram of the structure of the sixth pole piece group;

[0048] Figure 9 A schematic diagram of the structure of a battery cell in the related art (one end of the battery cell is provided with an integral tab assembly);

[0049] Figure 10 Related technologies include Figure 9 Schematic diagram of the structure of a battery with the cell shown.

[0050] Reference numerals:

[0051] 1-cell body; 11-first pole piece group; 12-second pole piece group; 13-third pole piece group; 14-fourth pole piece group; 15-fifth pole piece group; 16-sixth pole piece group; 2-tab group; 21-positive pole piece group; 211-first pole piece group; 212-third pole piece group; 213-fifth pole piece group; 214-seventh pole piece group; 215-ninth pole piece group; 216-eleventh pole piece group; 22-negative pole piece group; 221-second pole piece group; 222-fourth pole piece group; 223-sixth pole piece group; 224-eighth pole piece group; 225-tenth pole piece group; 226-twelfth pole piece group; 3-housing; 4-pole column; 5-adapter;

[0052] 100-battery cell body; 200-integral tab assembly; 201-integral positive tab assembly; 202-integral negative tab assembly. DETAILED DESCRIPTION

[0053] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0054] The core of this utility model is to provide a battery cell with high internal volume utilization, resulting in high capacity and energy density. Another core of this utility model is to provide a battery including the above-mentioned battery cell, which has high internal volume utilization, thereby increasing the battery's capacity and energy density. Another core of this utility model is to provide an electrical device including the above-mentioned battery, which has high capacity and energy density.

[0055] Please refer to Figure 1 and Figure 4 An embodiment of the present invention provides a battery cell, comprising a battery cell body 1 and n tab groups 2 with the same polarity, wherein the n tab groups 2 with the same polarity are arranged at the same end of the battery cell body 1 and are staggered along the width direction of the battery cell body 1, where n is a positive integer ≥ 2; the tab group 2 includes a plurality of current collector tabs.

[0056] It should be noted that in the embodiments of the present invention, the width direction of the cell body 1 refers to the Y-axis direction in the accompanying drawings, and the length direction of the cell body 1 refers to the X-axis direction in the accompanying drawings. Furthermore, it is understood that the width direction of the tab assembly 2 refers to the Y-axis direction in the accompanying drawings, and the thickness of the tab assembly 2 refers to the distance that the tab assembly 2 extends from the end of the cell body 1 along the length direction of the cell body 1. Therefore, the thickness direction of the tab assembly 2 is the X-axis direction.

[0057] In addition, it should be noted that, in the embodiment of the present invention, n tab groups 2 with the same polarity are arranged at the same end of the cell body 1 and are staggered along the width direction of the cell body 1, which means that the tab groups 2 with the same polarity located at the same end of the cell body 1 are staggered along the width direction of the cell body (that is, along the width direction of the cell body). Figure 1 and Figure 4 There is no overlapping part or a partial overlapping part in the Y-axis direction of the battery cell body 1, that is, along the width direction of the battery cell body 1, there is a certain distance or the distance is zero between any two adjacent electrode tab groups 2 with the same polarity.

[0058] That is to say, the embodiment of the present invention combines an integral tab group 200 (such as Figure 9 and Figure 10 As shown in FIG), the battery cell body 1 is divided into n independent and staggered tab groups 2 along the width direction (ie, the Y-axis direction) of the battery cell body 1 (as shown in FIG). Figure 1 andFigure 4 As shown), in this way, the number of current collector tabs in each tab group 2 will be reduced compared to the number of current collector tabs in the overall tab group 200. Since the thickness of the tab group 2 is equal to the sum of the overall thickness of all current collector tabs forming the tab group 2 and the welding thickness of the current collector tabs, after an overall tab group 200 is divided into n tab groups 2 with the same polarity, the number of current collector tabs contained in the tab group 2 is reduced, and the overall thickness of all current collector tabs forming the tab group 2 and the welding thickness of the current collector tabs will both be reduced, thereby reducing the thickness of the tab group 2.

[0059] It is understandable that after the thickness of the tab group 2 is reduced, the space between the battery cell and the end cover of the battery shell 3 is reduced, thereby saving space between the battery cell and the end cover of the battery shell 3, which is conducive to increasing the length of the battery cell body 1, improving the volume utilization of the battery cell inside the battery, and improving the quality of the active material in the battery cell, thereby improving the capacity and energy density of the battery cell. In addition, this structure is also conducive to enhancing the compactness of the battery cell structure and avoiding the risk of collision during the winding or stacking process of the battery cell. Furthermore, after dividing an integral tab group 200 into n tab groups 2 with the same polarity, the number of welding layers of the current collector tabs of the tab group 2 can be reduced, reducing the welding risk of large-capacity multi-layer current collector tabs.

[0060] It should be noted that this embodiment does not limit the specific value of n. The greater the number of n, the smaller the overall thickness of the tab group 2 of the battery cell. In the case of a battery case 3 of the same size, the length of the battery cell body 1 is longer, and the volume utilization rate of the battery cell is higher. It can be understood that when the number of tab groups 2 of the same polarity is n, the electrode sheets of the battery cell body 1 and the tab group 2 with the same polarity are divided into n electrode group groups, and the current collector tabs of the electrode sheets of different electrode group groups are welded to form tab groups 2 with different positions.

[0061] For example, Figure 1 As shown, in some embodiments, n=2, that is, the number of tab groups 2 with the same polarity located at the same end of the battery cell body 1 is two, and the two tab groups 2 are staggered along the width of the battery cell body 1; for example, two positive tab groups 21 are provided at one end of the battery cell body 1, and two negative tab groups 22 are provided at the other end, the two positive tab groups 21 are staggered along the width direction of the battery cell body 1, and the two negative tab groups 22 are staggered along the width direction of the battery cell body 1. Correspondingly, please combine Figure 2 and Figure 3, the number of electrode groups is two. For the sake of convenience, the two electrode groups are respectively referred to as the first electrode group 11 and the second electrode group 12. The collector tabs of the positive electrode sheet of the first electrode group 11 are welded to form the first electrode tab group 211, the collector tabs of the negative electrode sheet of the first electrode group 11 are welded to form the second electrode tab group 221, the collector tabs of the positive electrode sheet of the second electrode group 12 are welded to form the third electrode tab group 212, and the negative electrode sheet of the second electrode group 12 is welded to form the third electrode tab group 213. The current collector tabs are welded to form the fourth tab group 222. After the first pole piece group 11 and the second pole piece group 12 are stacked, the first tab group 211 and the third tab group 212 are the positive pole tab group 21, and the two are staggered along the width direction of the battery cell body 1 and are arranged at the same end of the battery cell body 1; similarly, the second tab group 221 and the fourth tab group 222 are the negative pole tab group 22, and the two are staggered along the width direction of the battery cell body 1 and are arranged at the same end of the battery cell body 1.

[0062] Of course, in other embodiments, n can be equal to 3, 4 or other values, as long as the overcurrent and temperature rise of the tab group 2 are appropriate. Figure 4 As shown, n=4, that is, the number of the tab groups 2 with the same polarity located at the same end of the battery body 1 is four, and the four tab groups 2 are staggered along the width of the battery body 1; correspondingly, please combine Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , the number of electrode groups is four. For the convenience of description, the four electrode groups are respectively referred to as the third electrode group 13, the fourth electrode group 14, the fifth electrode group 15 and the sixth electrode group 16. The collector tabs of the positive electrode sheets of the third electrode group 13 are welded to form the fifth electrode group 213, the collector tabs of the negative electrode sheets of the third electrode group 13 are welded to form the sixth electrode group 223, the collector tabs of the positive electrode sheets of the fourth electrode group 14 are welded to form the seventh electrode group 214, the collector tabs of the negative electrode sheets of the fourth electrode group 14 are welded to form the eighth electrode group 224, the collector tabs of the positive electrode sheets of the fifth electrode group 15 are welded to form the ninth electrode group 215, and the collector tabs of the negative electrode sheets of the fifth electrode group 15 are welded to form the tenth electrode group 225 The current collector tabs of the positive electrode sheet of the sixth electrode sheet group 16 are welded to form the eleventh electrode tab group 216, and the current collector tabs of the negative electrode sheet of the sixth electrode sheet group 16 are welded to form the twelfth electrode tab group 226. After the third electrode sheet group 13, the fourth electrode sheet group 14, the fifth electrode sheet group 15 and the sixth electrode sheet group 16 are stacked, the fifth electrode tab group 213, the seventh electrode tab group 214, the ninth electrode tab group 215 and the eleventh electrode tab group 216 are the positive electrode tab group 21, and the four are staggered along the width direction of the battery cell body 1 and are arranged at the same end of the battery cell body 1; the sixth electrode tab group 223, the eighth electrode tab group 224, the tenth electrode tab group 225 and the twelfth electrode tab group 226 are the negative electrode tab group 22, and the four are staggered along the width direction of the battery cell body 1 and are arranged at the same end of the battery cell body 1.

[0063] In addition, it can be understood that the greater the number n, the smaller the width of each tab group 2 , and the width of the tab group 2 will affect its flow capacity, and the flow of the tab group 2 will affect the temperature at the tab group 2 .

[0064] In order to ensure that the tab group 2 has sufficient overcurrent and an appropriate temperature rise, in some embodiments, the battery cell also satisfies the following relationship:

[0065]

[0066] Among them, w is the width of the tab group 2, I is the maximum continuous charge and discharge current of the battery cell, M is the number of pole pieces with the same polarity as the tab group 2, and h is the thickness of the current collector tab.

[0067] From the above formula, it can be seen that the width w of the tab group 2 satisfies the following relationship:

[0068]

[0069] In other words, the width w of the tab assembly 2 is related to the three parameters I, M, and h. It should be noted that this embodiment does not impose any restrictions on the range of values ​​for w, I, M, and h, as long as they meet the design requirements of the battery cell. In some embodiments, I ranges from 10 to 300A; M ranges from 10 to 200; and w ranges from 5 to 80mm.

[0070] Furthermore, in some embodiments, the material of the current collector tab is copper foil, and the value range of h is 3-12 μm.

[0071] It can be understood that the smaller the width w of the tab group 2 is, the more conducive it is to arrange multiple tab groups 2, that is, the larger the value of n can be. Therefore, ideally, w takes the minimum value, that is,

[0072]

[0073] In this case, it is possible to ensure that the value of n is larger. At the same time, it is necessary to ensure that the tab group 2 has sufficient overcurrent and an appropriate temperature rise.

[0074] In addition, in some embodiments, the battery cell satisfies the following relationship:

[0075]

[0076] Among them, the material of the current collector tab is aluminum foil, and the value range of h is 7~16μm.

[0077] It is understandable that The value is the current density. When the material of the current collector tab is different, the range of current density is different. In some embodiments, the material of the current collector tab is copper foil.

[0078] In other embodiments, the material of the current collector tab is aluminum foil. Moreover, when the material of the current collector tab is copper foil, the value range of h is 3~12μm; when the material of the current collector tab is aluminum foil, the value range of h is 7~16μm.

[0079] In addition, in some embodiments, the number n of tab groups 2 with the same polarity needs to satisfy the following relationship:

[0080]

[0081] Wherein, b is the width of the battery cell body 1.

[0082] As can be seen from the above, the larger the value of n, the more the thickness space occupied by the tab group 2 can be saved, because the more tab groups 2 that can be staggered, the fewer the number of current collector tabs contained in each tab group 2, and the sum of the thickness of the current collector tabs forming the tab group 2 and the welding thickness of the current collector tabs are smaller. Therefore, as long as the temperature rise caused by the overcurrent is reasonable, the larger the n value, the better; in addition, the n value needs to meet the structural size requirements. Therefore, this embodiment limits the maximum limit value of the n value, that is:

[0083]

[0084] Ideally, n takes the maximum value, that is,

[0085]

[0086] In this way, the total thickness of the tab group 2 can be minimized while ensuring that the tab group 2 has sufficient overcurrent and a suitable temperature rise.

[0087] It should be noted that the widths of different tab groups 2 can be the same or different, as long as the widths of each tab group 2 can meet the requirements of the above relationship to ensure sufficient current flow and appropriate temperature rise of the tab group 2. Considering the convenience of processing and assembly, in some embodiments, the widths of n tab groups 2 with the same polarity are the same.

[0088] In addition, the number of current collector tabs in different tab groups 2 may be the same or different. It is understandable that when the number of current collector tabs in different tab groups 2 is different, the total thickness of the tab group 2 is determined by the tab group 2 containing the largest number of current collector tabs. Therefore, a preferred solution is to evenly divide the number of current collector tabs in different tab groups 2, that is, the number of current collector tabs in each tab group 2 is the same. This can make the overall thickness of the current collector tabs in each tab group 2 the same, the welding thickness the same, and thus make the thickness of different tab groups 2 the same, which is conducive to minimizing the total thickness of the tab group 2 at the end of the battery cell body 1.

[0089] In addition, the above embodiments do not limit the specific thickness of the tab group 2, as long as it can ensure that the tab group 2 has sufficient flow and a suitable temperature rise.

[0090] Furthermore, it should be noted that this staggered arrangement of n tab groups 2 of the same polarity can be applied to both the positive tab group 21 and the negative tab group 22. For example, in some embodiments, the battery cell includes n1 positive tab groups 21, which are disposed at one end of the battery cell body 1 and staggered along the width of the battery cell body 1, where n1 is a positive integer ≥ 2. This arrangement reduces the overall thickness of the positive tab group 21, thereby conserving space between the end of the battery cell body 1 where the positive tab group 21 is disposed and the end cap of the battery casing 3. In other embodiments, the battery cell includes n2 negative tab groups 22, which are disposed at one end of the battery cell body 1 and staggered along the width of the battery cell body 1, where n2 is a positive integer ≥ 2. This arrangement reduces the overall thickness of the negative tab group 22, thereby conserving space between the end of the battery cell body 1 where the negative tab group 22 is disposed and the end cap of the battery casing 3. It should be noted that when the battery cell includes n1 positive electrode tab groups 21, it may also include one negative electrode tab group 22, that is, the positive electrode tab group 21 has n1 and is staggered, and the negative electrode tab group 22 is a conventional setting in the relevant art; of course, it can also be the opposite, that is, when the battery cell includes n2 negative electrode tab groups 22, it may also include one positive electrode tab group 21, that is, the negative electrode tab group 22 has n2 and is staggered, and the positive electrode tab group 21 is a conventional setting in the relevant art. In other embodiments, it can also be such a scheme: the battery cell includes n1 positive electrode tab groups 21 and n2 negative electrode tab groups 22, that is, in this embodiment, the positive electrode tab group 21 has n1 and is staggered, and the negative electrode tab group 22 has n2 and is staggered. The overall thickness of the positive electrode tab group 21 and the negative electrode tab group 22 are both low, which is conducive to minimizing the overall thickness of the tab group area.

[0091] Furthermore, it should be noted that this staggered arrangement of n tab groups 2 with the same polarity can be applied to the case where the tab group 2 is located at one end of the battery cell body 1 , and can also be applied to the case where the tab group 2 is located at both ends of the battery cell body 1 .

[0092] For example, in some embodiments, the battery cell includes a positive electrode tab group 21 and a negative electrode tab group 22, and the positive electrode tab group 21 and the negative electrode tab group 22 are respectively located at the two ends of the battery cell body 1. For example, n1 positive electrode tab groups 21 are located at one end of the battery cell body 1, and n2 negative electrode tab groups 22 are located at the other end of the battery cell body 1. In this way, for the solution in which the tab groups 2 are provided at both ends of the battery cell body 1, the total thickness of the tab groups 2 at both ends of the battery cell body 1 can be made smaller, that is, the total thickness of the tab group area can be made smaller, thereby reducing the space between the tab groups 2 at both ends of the battery cell body 1 and the end caps of the battery casing 3 at the corresponding ends, which helps to increase the length of the battery cell body 1.

[0093] Of course, in other embodiments, it is also possible to adopt such a scheme that all positive electrode tab groups 21 and all negative electrode tab groups 22 are located at the same end of the battery cell body 1. That is, this scheme is a case where the tab group 2 is provided at a single end of the battery cell body 1. In this case, the positive electrode tab group 21 and the negative electrode tab group 22 are located at the same end of the battery cell body 1, and the positive electrode tab group 21 and the negative electrode tab group 22 are staggered. For example, in some embodiments, one end of the battery cell body 1 is provided with n1 positive electrode tab groups 21 and n2 negative electrode tab groups 22, the n1 positive electrode tab group 21 is staggered along the width direction of the battery cell body 1, and the n2 negative electrode tab groups 22 are staggered along the width direction of the battery cell body 1, and the sum of the width of the n1 positive electrode tab group 21 and the width of the n2 negative electrode tab groups 22 is ≤ the width of the battery cell body 1. In this solution, the total thickness of the tab group area is determined by the larger of the overall thickness of the positive tab group 21 and the overall thickness of the negative tab group 22. Therefore, the preferred solution is that the overall thickness of the n1 positive tab groups 21 is the same as the overall thickness of the n2 negative tab groups 22.

[0094] In addition, it should be noted that the above embodiments do not limit the specific material of the tab group 2. For example, in some embodiments, the positive tab group 21 includes aluminum foil current collector tabs or other materials that can be used as positive current collector tabs; the negative tab group 22 includes aluminum foil current collector tabs, copper foil current collector tabs or other materials that can be used as negative current collector tabs.

[0095] In addition, the above embodiments do not limit the specific method of forming the battery cell body 1, as long as the battery cell body 1 can be formed.

[0096] In some embodiments, the battery cell body 1 is formed by winding; alternatively, the battery cell body 1 is formed by stacking sheets. It is understood that when the battery cell body 1 is formed by winding, the battery cell is called a wound core; when the battery cell body 1 is formed by stacking sheets, the battery cell is called a stacked core. For detailed information on the core winding and stacking processes, please refer to relevant technologies and will not be further described here.

[0097] The following is a comparative illustration of twelve battery cells with different structures and parameters. For ease of description, the twelve different battery cells are labeled C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, and C12.

[0098] The similarities between C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, and C12 are as follows: the length, width, and thickness of each cell are 280mm, 100mm, and 25mm, respectively. The cells are stacked using a lamination process, with 100 positive electrode sheets and 101 negative electrode sheets. The positive current collector tabs are made of 10μm thick aluminum foil, with the number of positive current collector tabs equal to the number of positive electrode sheets, while the negative current collector tabs are made of 6μm thick copper foil, with the number of negative current collector tabs equal to the number of negative electrode sheets. The cell chemistry is as follows: the positive electrode is made of NCM811 high-nickel ternary material, and the negative electrode is a blend of 10% silicon and 90% graphite. The cells are manufactured according to the standard cell production process.

[0099] Among them, C1 and C2 are comparative examples, which belong to the battery cells in the related art. The difference between C1 and C2 is that: C1 has an integral tab group 200 at both ends of the battery cell, that is, an integral positive tab group 201 and an integral negative tab group 202 are respectively provided at both ends of C1; C2 has an integral tab group 200 at one end of the battery cell, that is, the integral positive tab group 201 and the integral negative tab group 202 of C2 are both provided at the same end of C2.

[0100] The similarities between C1 and C2 are that: the current collector tabs of the integral positive electrode tab groups 201 of C1 and C2 are neatly arranged together, and the current collector tabs of the integral negative electrode tab group 202 are neatly arranged together, that is, the integral positive electrode tab group 201 is an integral tab group, and the integral negative electrode tab group 202 is an integral tab group; the integral positive electrode tab group 201 and the integral negative electrode tab group 202 are respectively connected to the end caps of the corresponding ends of the battery, and the distance between the end caps and the end faces of the battery cells at the corresponding ends includes The bending thickness of the tab group and the welding thickness of the tab group, that is, the distance between the end face of the battery cell at the end where the overall positive tab group 201 is located and the end cover at the corresponding end includes the bending thickness of the positive tab group (that is, the overall thickness of the collector tab contained in the positive tab group) and the welding thickness of the positive tab group, and the distance between the end face of the battery cell at the end where the overall negative tab group 202 is located and the end cover at the corresponding end includes the bending thickness of the negative tab group (that is, the overall thickness of the collector tab contained in the negative tab group) and the welding thickness of the negative tab group.

[0101] In C1, please refer to Figure 9 and Figure 10 The battery cell's body 100 is provided with integral tab assemblies 200 at both ends. These integral tab assemblies 200 comprise an integral positive tab assembly 201 and an integral negative tab assembly 202, respectively. The widths of the integral positive tab assembly 201 and the integral negative tab assembly 202 are 45 mm, respectively. The bent thickness of the integral positive tab assembly 201 of C1 is 1.5 mm, and the welded thickness is 2 mm. The bent thickness of the integral negative tab assembly 202 is 1 mm, and the welded thickness is 1.5 mm. Since the integral positive tab assembly 201 and the integral negative tab assembly 202 of C1 are located at both ends of C1, the total thickness of the positive and negative tab assembly regions is 6 mm. Furthermore, the overcurrent ratings of the integral positive tab assembly 201 are 2.22 A / mm², and those of the integral negative tab assembly 202 are 3.70 A / mm².

[0102] The bending thickness of the overall positive electrode tab group 201 of C2 is 1.5mm, and the welding thickness of the overall positive electrode tab group 201 is 2mm; the bending thickness of the overall negative electrode tab group 202 is 2mm, and the welding thickness of the overall negative electrode tab group 202 is 1.5mm. Since the overall positive electrode tab group 201 and the overall negative electrode tab group 202 of C2 are located at the same end of C2, the total thickness of the positive electrode tab group area and the negative electrode tab group area is 3.5mm. In addition, the overflow current of the overall positive electrode tab group 201 is 2.22A / mm 2 The overcurrent of the entire negative electrode tab group 202 is 3.70A / mm 2 .

[0103] C3, C4, C5 and C6 belong to embodiments of the present invention.

[0104] C3 is a battery cell disclosed in an embodiment of the present invention. C3 is a case where tab groups 2 are provided at both ends of the battery cell. The difference between C3 and C1 is that: the number of tab groups 2 at both ends of the battery cell of C3 is two, and the two tab groups 2 at the same end of the battery cell are staggered, that is, one end of C3 is provided with two tab groups 2 along the width direction of the battery cell (such as Figure 1 The positive electrode tab group 21 is staggered along the Y-axis direction of the cell, and the other end of C3 is provided with a staggered positive electrode tab group 21 along the width direction of the cell (such as Figure 1 In the Y-axis direction of the cell, two negative electrode tab groups 22 are misaligned. In this case, the widths of the positive electrode tab group 21 and the negative electrode tab group 22 are reduced by half compared to the widths of the overall positive electrode tab group 201 and the overall negative electrode tab group 202 of C1, that is, the widths of the positive electrode tab group 21 and the negative electrode tab group 22 are 22.5 mm, respectively. In this way, the sum of the widths of the two positive electrode tab groups 21 at the same end of the battery cell is 45 mm, and the sum of the widths of the negative electrode tab group 22 at the same end of the battery cell is 45 mm. However, the bending thickness of the positive electrode tab group 21 is 0.7 mm, and the total welding thickness of the positive electrode tab group 21 is 1 mm; the bending thickness of the negative electrode tab group 22 is 0.5 mm, and the welding thickness of the negative electrode tab group 22 is 0.7 mm. Therefore, the total thickness of the positive electrode tab group area and the negative electrode tab group area is 2.9 mm, which makes the length direction of the battery cell (such as Figure 1 The total space saved is 3.1mm in the X-axis direction shown. In addition, the overcurrent of the positive electrode tab group 21 is 4.44A / mm 2 The overcurrent of the negative electrode tab group 22 is 7.40A / mm 2 .

[0105] C4 is another battery cell disclosed in the embodiment of the present invention. It differs from C3 in that: the width of the positive electrode tab group 21 and the negative electrode tab group 22 are 45mm respectively, so the sum of the widths of the two positive electrode tab groups 21 at the same end of the battery cell is 90mm, and the sum of the widths of the two negative electrode tab groups 22 at the same end of the battery cell is 90mm. The total thickness of the positive electrode tab group area and the negative electrode tab group area is 2.9mm, which saves 3.1mm of total space in the length direction of the battery cell compared to C1. In addition, the overcurrent of the positive electrode tab group 21 is 2.22A / mm 2 The overcurrent of the negative electrode tab group 22 is 3.70A / mm 2 .

[0106] C5 is another battery cell disclosed in the embodiment of the present utility model. The difference between it and C3 is that the number of the tab groups 2 at both ends of the battery cell of C5 is four (such as Figure 4 As shown), and the four tab groups 2 at the same end of the cell are staggered, that is, one end of C5 is provided with four tabs along the width direction of the cell (as shown). Figure 4The positive electrode tab group 21 is staggered along the Y-axis direction of the battery cell, and the other end of C5 is provided with a staggered positive electrode tab group 21 along the width direction of the battery cell (such as Figure 4 In the Y-axis direction of the cell, the widths of the positive tab group 21 and the negative tab group 22 are respectively reduced by half compared to the widths of the positive tab group 21 and the negative tab group 22 of C3. That is, the widths of the entire positive tab group 201 and the entire negative tab group 202 of C5 are reduced to a quarter of those of C1. That is, the widths of the positive tab group 21 and the negative tab group 22 of C5 are respectively 11.25 mm. In this way, the widths of the four positive tab groups 21 at the same end of the battery cell are reduced by half compared to the widths of the positive tab group 21 and the negative tab group 22 of C3. The sum of the widths is 45mm. The sum of the widths of the four negative tab groups 22 at the same end of the battery cell is 45mm. However, the bending thickness of the positive tab group 21 is 0.3mm, and the total welding thickness of the positive tab group 21 is 0.5mm; the bending thickness of the negative tab group 22 is 0.25mm, and the welding thickness of the negative tab group 22 is 0.35mm. Therefore, the total thickness of the positive tab group area and the negative tab group area is 1.4mm, which saves 4.6mm of total space in the length direction of the battery cell compared to C1. In addition, the overcurrent of the positive tab group 21 is 8.88A / mm 2 The overcurrent of the negative electrode tab group 22 is 14.80A / mm 2 .

[0107] C6 is another battery cell disclosed in the embodiment of the present invention. It differs from C3 in that the widths of the positive electrode tab group 21 and the negative electrode tab group 22 at both ends of C6 are 40 mm respectively, the sum of the widths of the two positive electrode tab groups 21 of C6 is 80 mm, and the sum of the widths of the two negative electrode tab groups 22 of C6 is 80 mm. The total thickness of the positive electrode tab group area and the negative electrode tab group area is the same as that of C3, which is 2.9 mm. Compared with C1, the total space in the length direction of the battery cell is saved by 3.1 mm. The overcurrent of the positive electrode tab group 21 is 2.5 A / mm 2 , the overcurrent of negative electrode tab group 22 is 4.2A / mm 2 .

[0108] C7 is another battery cell disclosed in an embodiment of the present invention. It differs from C3 in that the widths of the positive electrode tab group 21 and the negative electrode tab group 22 at both ends of C7 are 7.5mm respectively (close to the maximum width of the tab group 22 determined by the formula described above. The minimum width of the positive electrode tab group 21 calculated by the formula described above is 7.14mm, and the minimum width of the negative electrode tab group 22 is 6.88mm). The total thickness of the positive electrode tab group area and the negative electrode tab group area is the same as that of C3, which is 2.9mm. Compared with C1, the total space in the length direction of the battery cell is saved by 3.1mm. The overcurrent of the positive electrode tab group 21 is 13.3A / mm 2 , the overcurrent of negative electrode tab group 22 is 22.0A / mm2 .

[0109] C8 is another battery cell disclosed in the embodiment of the present invention. It differs from C3 in that the widths of the positive tab group 21 and the negative tab group 22 at both ends of C8 are 5.6mm respectively, which is less than the minimum limit width of the tab group 22 determined by the formula described above. The total thickness of the positive tab group area and the negative tab group area is the same as C3, which is 2.9mm. Compared with C1, the total space in the length direction of the battery cell is saved by 3.1mm. The overcurrent of the positive tab group 21 is 17.9A / mm 2 , the overcurrent of negative electrode tab group 22 is 29.5A / mm 2 .

[0110] C9 is another battery cell disclosed in an embodiment of the present utility model, which differs from C7 in that: C7 has two pole tab groups 2 at both ends of the battery cell, while C9 has six pole tab groups 2 at both ends of the battery cell. The widths of the positive pole tab group 21 and the negative pole tab group 22 at both ends of C9 are the same as those of C7, which are 7.5 mm respectively. However, after the number of pole tab groups 2 at a single end of the battery cell increases to six, the total width of the positive pole tab group 21 is 45 mm, and the total width of the negative pole tab group 22 is 45 mm. The bending thickness of the positive pole tab group 21 is 0.2 mm, and the welding thickness of the positive pole tab group 21 is 0.35 mm; the bending thickness of the negative pole tab group 22 is 0.18 mm, and the welding thickness of the negative pole tab group 22 is 0.28 mm; the total thickness of the positive pole tab group area and the negative pole tab group area is 1.01 mm, which saves 4.99 mm of the total space in the length direction of the battery cell compared to C1. The overcurrent of the positive electrode tab group 21 is 13.3A / mm 2 , the overcurrent of negative electrode tab group 22 is 22.0A / mm 2 .

[0111] C10 is another battery cell disclosed in an embodiment of the present utility model, which differs from C8 in that: C8 is provided with two pole tab groups 2 at both ends of the battery cell, while C10 is provided with eight pole tab groups 2 at both ends of the battery cell. The widths of the positive pole tab group 21 and the negative pole tab group 22 at both ends of C10 are the same as those of C8, which are 5.6 mm respectively. However, after the number of pole tab groups 2 at a single end of the battery cell increases to eight, the total width of the positive pole tab group 21 is 45 mm, and the total width of the negative pole tab group 22 is 45 mm. The bending thickness of the positive pole tab group 21 is 0.16 mm, and the welding thickness of the positive pole tab group 21 is 0.3 mm; the bending thickness of the negative pole tab group 22 is 0.15 mm, and the welding thickness of the negative pole tab group 22 is 0.23 mm; the total thickness of the positive pole tab group area and the negative pole tab group area is 0.84 mm. Compared with C1, the total space in the length direction of the battery cell is saved by 5.16 mm. The overcurrent of the positive electrode tab group 21 is 17.9A / mm 2, the overcurrent of negative electrode tab group 22 is 29.5A / mm 2 .

[0112] C11 is another battery cell disclosed in the embodiment of the present utility model. It differs from C3 in that: the charge and discharge rate is changed from 1C / 1C to 1.2C / 1.2C, that is, the maximum continuous charge and discharge current of the battery cell is changed from I=100A to I=120A. The total thickness of the positive electrode tab group area and the negative electrode tab group area is the same as C3, which is 2.9mm. Compared with C1, the total space in the length direction of the battery cell is saved by 3.1mm. The overcurrent of the positive electrode tab group 2 is 5.3A / mm 2 , the overcurrent of negative electrode tab group 2 is 8.8A / mm 2 .

[0113] C12 is another battery cell disclosed in an embodiment of the present invention. C12 is a case of a single-ended tab group 2. The difference between C12 and C2 is that the number of the positive tab group 21 and the negative tab group 22 of the battery cell of C12 is two respectively. In this case, the widths of the positive tab group 21 and the negative tab group 22 are reduced by half compared to the widths of the positive tab group 21 and the negative tab group 22 of C2, that is, the widths of the positive tab group 21 and the negative tab group 22 are 22.5 mm respectively. In this way, the sum of the widths of the two positive tab groups 21 of C12 is 45mm, the sum of the widths of the two negative tab groups 22 of C12 is 45mm, the sum of the widths of the positive tab group 21 and the negative tab group 22 at one end of C12 is 90mm, and the bending thickness of the positive tab group 21 is 0.7mm, and the total welding thickness of the positive tab group 21 is 1mm; the bending thickness of the negative tab group 22 is 1mm, and the welding thickness of the negative tab group 22 is 0.7mm. Therefore, the total thickness of the positive tab group area and the negative tab group area is 1.7mm, which saves 1.8mm of total space in the length direction of the battery cell compared to C2. In addition, the overcurrent of the positive tab group 21 is 4.44A / mm 2 The overcurrent of the negative electrode tab group 22 is 7.40A / mm 2 .

[0114] Table 1 shows the data comparison of n value, I value, width of positive electrode tab group 21 and negative electrode tab group 21, overcurrent of positive electrode tab group 21, overcurrent of negative electrode tab group 22, cell capacity, cell weight energy density (WED), temperature at tab group and 1C / 1C cycle of C1, C3, C4, C6~C8 and C11.

[0115] Among them, the weight energy density WED calibration refers to recording the discharge energy of C1~C12 between 4.25V and 2.75V according to the 0.33C / 0.33C charge and discharge system, and ratioing it to the weight of each battery cell is WED.

[0116] In addition, the cell cycle test involves cycling cells C1-C12 at room temperature (25°C) using a 1C / 1C charge / discharge cycle with a voltage range of 4.25V to 2.75V. The number of cycles required for the cell capacity to decay to 80% of its initial capacity is recorded. During the cycling process, the temperature at tab group 2 is monitored to determine any overcurrent and heat generation.

[0117] Table 1: Comparison of parameters of C1, C3, C4, C6~C8, and C11

[0118]

[0119] It should be noted that the widths of the positive tab group 21 and the negative tab group 22 of each battery cell in Table 1 are the same. By comparing the data of the width w of the positive and negative tab groups of C1, C3, C4, C6~C8 in Table 1, it can be seen that the smaller the width of the tab group 2, the greater the overcurrent of the tab group 2, and the higher the temperature at the tab group 2. It can be seen from Table 1 that when the width of the tab group 2 is close to the limit width of the tab group 22 determined by the formula described above, the above formula ( or

[0120] ), for example, when the width w of the tab group 2 is 7.5 mm, which is C7 (the minimum width of the positive tab group 21 obtained by the above formula is 7.14 mm, and the minimum width of the negative tab group 22 obtained by the above formula is 6.88 mm), the temperature at the tab group 2 is higher due to the smaller width of the tab group 2. When the width w of the tab group 2 is 5.6 mm, which is C8, the width w of the tab group 2 does not satisfy the above formula, and the temperature at the tab group 2 is higher. This shows that the temperature of the tab group 2 is not suitable for taking the minimum value obtained by the formula or the width value that does not satisfy the above formula. The width of the tab group 2 needs to take an appropriate temperature greater than the minimum value to ensure an appropriate temperature rise of the tab group 2. That is, when the number n of tab groups 2 with the same polarity is the same, and the total width of the tab group 2 meets the requirements, the wider the tab group 2, the better.

[0121] By comparing the data of C11 (I=120A) and C3 (I=100A) in Table 1, it can be seen that when the width w of the tab group 2 is the same, increasing the maximum continuous charge and discharge current I value of the battery cell can also reduce the temperature at the tab group 2. Therefore, by increasing the I value and reducing the w value, it is beneficial to set a larger n value.

[0122] Table 2 shows a data comparison of the n value, the width of the positive electrode tab group 21 and the negative electrode tab group 21, the bending thickness of the positive electrode tab group 21, the total welding thickness of the positive electrode tab group 21, the bending thickness of the negative electrode tab group 22, the total welding thickness of the negative electrode tab group 22, the total thickness of the tab group area, the overcurrent of the positive electrode tab group 21, the overcurrent of the negative electrode tab group 22, the battery cell capacity, the battery cell weight energy density (WED), the temperature at the tab group, and the 1C / 1C cycle.

[0123] Table 2: Comparison of parameters of C1, C3, C5, C9 and C10

[0124]

[0125] Comparing the data for C3 (n1 = 2 and n2 = 2), C5 (n1 = 4 and n2 = 4), C9 (n1 = 6 and n2 = 6), and C10 (n1 = 8 and n2 = 8) in Table 2 with C1 (tab group 2 being a single tab group 200), it can be seen that setting the number of tab groups 2 of the same polarity to n and staggering these n tab groups 2 significantly reduces the total thickness of the tab group region. Furthermore, the greater the number of tab groups 2, n, the smaller the total thickness of the tab group region. However, in conjunction with Table 1 and the data on the widths of the positive and negative tab groups and the temperatures at the tab groups in Table 2, it can be seen that, given a fixed total width of n tab groups 2, the greater the number of tab groups 2 of the same polarity, the smaller the width of each tab group 2 will be. However, if the width of the tab group 2 is too small, the temperature rise at the tab group 2 will be excessive. Therefore, it is necessary to combine the width range of the tab group 2 determined by the above formula and the number n of the tab groups 2 of the same polarity to comprehensively select the width value of the tab group 2 so that the width w of the tab group 2 meets the temperature rise requirement while allowing n to take a larger value.

[0126] Furthermore, the data in Table 2 shows that staggering n tab groups 2 of the same polarity improves the cell's capacity and WED. The greater the number of tab groups 2, n, the greater the WED improvement. From n=2 to n=8, WED increases by approximately 2% to 3%.

[0127] In addition, it can be seen from the data in Table 3 that after n tab groups 2 with the same polarity are staggered, from the temperature rise data at the tab group 2, the larger the number n of tab groups 2, the greater the temperature rise at the tab group 2. Therefore, when selecting the value of n, it is necessary to meet the temperature rise requirements at the tab group 2 at the same time.

[0128] Table 3 is a data comparison table of n value, width of positive electrode tab group 21 and negative electrode tab group 21 respectively, bending thickness of positive electrode tab group 21, total welding thickness of positive electrode tab group 21, bending thickness of negative electrode tab group 22, total welding thickness of negative electrode tab group 22, total thickness of tab group area, overcurrent of positive electrode tab group 21, overcurrent of negative electrode tab group 22, capacity of battery cell, weight energy density (WED) of battery cell, temperature at tab group area and 1C / 1C cycle when the battery cell is single-ended with tab group.

[0129] Table 3: Comparison of parameters of C2 and C12

[0130]

[0131] From the data comparison of C12 (battery cell is single-ended with tab group, n1=2 and n2=2) and C2 (battery cell is single-ended with one whole tab group 200) in Table 3, it can be seen that for the case of battery cell being single-ended with tab group 2, the total thickness of tab group area can be obviously reduced by setting tab group 2 as n tab groups 2 with same polarity and staggered.

[0132] In addition to the above battery cell, the utility model also provides a battery including the battery cell disclosed in the above embodiments, wherein the battery further includes a shell 3, the battery cell is arranged in the shell 3, the shell 3 is provided with a pole 4, and the tab group 2 of the battery cell is connected with the pole 4. Other structures of the battery can refer to related technologies, and will not be described here.

[0133] That is to say, the focus of the embodiment is that the battery cell disclosed in any one of the above embodiments has the same beneficial effects as the battery cell described above, and will not be described here.

[0134] It should be noted that the embodiment does not limit the specific connection mode of the tab group 2 of the battery cell and the pole 4, as long as the electrical connection between the two can be realized.

[0135] In some embodiments, n tab groups 2 are connected to the electrode column 4 through the same adapter plate 5. For example, the tab group 2 includes n1 positive tab groups 21 and n2 negative tab groups 22, the electrode column 4 includes a positive electrode column 4 and a negative electrode column 4, the n1 positive tab group 21 is connected to the positive electrode column 4 through the same first adapter plate 5, and the n2 negative tab groups 22 are connected to the negative electrode column 4 through the same second adapter plate 5. That is to say, in this embodiment, n tab groups 2 are connected to the pole post 4 by adding an adapter plate 5. After each positive tab group 21 is welded respectively, different positive tab groups 21 are connected to the same first adapter plate 5, and the first adapter plate 5 is connected to the first pole post 4, that is, different positive tab groups 21 are connected to the first pole post 4 through the first adapter plate 5; after each negative tab group 22 is welded respectively, different negative tab groups 22 are connected to the same second adapter plate 5, and the second adapter plate 5 is connected to the second pole post 4, that is, different negative tab groups 22 are connected to the second pole post 4 through the second adapter plate 5.

[0136] It should be noted that this embodiment does not limit the specific materials of the first adapter plate 5 and the second adapter plate 5. For example, if the first adapter plate 5 is a positive electrode adapter plate 5, the material of the first adapter plate 5 is aluminum or other materials that can be used as a positive electrode adapter plate 5. If the second adapter plate 5 is a negative electrode adapter plate 5, the material of the second adapter plate 5 is aluminum, copper, or other materials that can be used as a negative electrode adapter plate 5.

[0137] In addition, this embodiment does not limit the specific connection method between different positive electrode tab groups 21 and the first adapter plate 5, nor does it limit the specific connection method between different negative electrode tab groups 22 and the second adapter plate 5. As long as different positive electrode tab groups 21 can be connected to the first adapter plate 5 and different negative electrode tab groups 22 can be connected to the second adapter plate 5, it is sufficient. In some embodiments, the upper part of the bent portion of the positive electrode tab group 21 is connected to the lower part of the first adapter plate 5. This connection method facilitates the connection. In other embodiments, the lower part of the bent portion of the positive electrode tab group 21 is connected to the upper part of the first adapter plate 5. This connection method can further save space between the end face of the battery cell and the end cover of the housing 3, reducing the overall thickness of the tab group area. Similarly, in some embodiments, the upper part of the bent portion of the negative electrode tab group 22 is connected to the lower part of the second adapter plate 5, or the upper part of the bent portion of the negative electrode tab group 22 is connected to the lower part of the second adapter plate 5.

[0138] Furthermore, to ensure the reliability of the connection between the tab group 2 and the electrode column 4, in some embodiments, the sum of the widths of n tab groups 2 is ≤ the width of the adapter 5 ≤ the width of the housing 3. For example, the sum of the widths of all positive tab groups 21 is ≤ the width of the first adapter 5 ≤ the width of the housing 3; the sum of the widths of all negative tab groups 22 is ≤ the width of the second adapter 5 ≤ the width of the housing 3.

[0139] It can be understood that the sum of the widths of all positive tab groups 21 is less than or equal to the width of the first adapter 5, so that the first adapter 5 can completely cover all positive tab groups 21, thereby ensuring the reliability and effectiveness of the connection between the positive tab group 21 and the first pole 4, and preventing poor connection. The width of the first adapter 5 is less than or equal to the width of the shell 3, avoiding structural interference between the first adapter 5 and the shell 3, and facilitating battery assembly. Similarly, the sum of the widths of all negative tab groups 22 is less than or equal to the width of the second adapter 5, so that the second adapter 5 can completely cover all negative tab groups 22, thereby ensuring the reliability and effectiveness of the connection between the negative tab group 22 and the second pole 4, and preventing poor connection. The width of the second adapter 5 is less than or equal to the width of the shell 3, avoiding structural interference between the second adapter 5 and the shell 3, and facilitating battery assembly.

[0140] In addition to the above-mentioned battery, the present invention also provides an electrical device including the battery disclosed in the above-mentioned embodiment. For the structures of other parts of the electrical device, please refer to the relevant technology and will not be described in detail herein.

[0141] The key point of this embodiment is that the battery disclosed in any one of the above embodiments has the same beneficial effects as the above batteries.

[0142] It should also be noted that, in this specification, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0143] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0144] The above describes in detail the battery cell, battery, and electrical equipment provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A battery cell, characterized in that: include: Battery cell body (1); n tab groups (2) with the same polarity are arranged at the same end of the battery cell body (1), and two adjacent tab groups (2) are staggered along the width direction of the battery cell body (1), where n is a positive integer ≥ 2; the tab group (2) includes a plurality of current collector tabs; The battery cell also satisfies the following relationship: Wherein, w is the width of the tab group (2), I is the maximum continuous charge and discharge current of the battery cell, M is the number of the current collector tabs, and h is the thickness of the current collector tabs.

2. The battery cell according to claim 1, characterized in that The value range of I is 10~300A; the value range of M is 10~200; the value range of w is 5~80mm.

3. The battery cell according to claim 2, characterized in that The material of the current collector tab is copper foil, and the value range of h is 3-12 μm.

4. The battery cell according to claim 2, characterized in that The battery cell satisfies the following relationship: The material of the current collector tab is aluminum foil, and the value range of h is 7-16 μm.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The relationship satisfied by n is: Wherein, b is the width of the battery cell body (1).

6. The battery cell according to any one of claims 1 to 4, characterized in that: Each of the tab groups (2) has the same number of current collector tabs.

7. The battery cell according to any one of claims 1 to 4, characterized in that: The battery cell comprises: n1 positive electrode tab groups (21) are provided at one end of the battery cell body (1) and are staggered along the width direction of the battery cell body (1), where n1 is a positive integer ≥ 2; and / or, n2 negative electrode tab groups (22) are provided at one end of the battery cell body (1) and are staggered along the width direction of the battery cell body (1), where n2 is a positive integer ≥2.

8. The battery cell according to claim 7, characterized in that: The positive electrode tab group (21) and the negative electrode tab group (22) are respectively located at two ends of the battery cell body (1); or, the positive electrode tab group (21) and the negative electrode tab group (22) are located at the same end of the battery cell body (1).

9. A battery, characterized in that: include: The battery cell according to any one of claims 1 to 8; A housing (3), wherein the battery cell is arranged in the housing (3), the housing (3) is provided with a pole (4), and the tab group (2) of the battery cell is connected to the pole (4).

10. The battery according to claim 9, characterized in that The n tab groups (2) are connected to the pole (4) via the same adapter plate (5); the sum of the widths of the n tab groups (2) ≤ the width of the adapter plate (5) ≤ the width of the housing (3).

11. An electrical device, characterized in that: A battery comprising the battery according to claim 9 or 10.

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