Battery cell, battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell, a battery and electric equipment. And the tab group extends out from one side of the battery cell body, and comprises a plurality of tabs which are sequentially arranged along the third direction Z. The tab with the smallest size along the second direction Y is taken as a reference tab, and the sizes of the other tabs along the second direction Y are sequentially increased along a direction close to the reference tab to a direction far away from the reference tab; the size of the tabs along the second direction Y is L, the size of the tabs along the first direction X is H, and the ratios of L to H of the tabs are equal. Through the gradient change design of the length of the tabs, the end parts of the tabs are flush after the tabs are folded, so that cutting after welding is avoided, the generation of metal scraps is reduced, and the safety of the battery is improved. And the length-width ratios of the tabs are set to be equal, so that the tabs with the lengths changed in a gradient manner can keep consistent resistance, the resistance difference between different pole pieces is reduced, and the consistency and the overall performance of the battery cell are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, concretely relates to a battery cell, battery and electric equipment. BACKGROUND

[0002] With the continuous development of the battery industry, the battery gradually develops to large capacity and high rate. With the increase of the battery capacity, the number of the battery cell pole piece layers gradually increases, and the size and number of the pole lug connected with the pole piece also increase.

[0003] In the assembly process of the battery, the pole lug is usually welded with the connecting piece first, and then the connecting piece is welded on the cover plate. At present, in order to facilitate the connection of each pole lug and the connecting piece, the commonly used way is to align and stack each pole lug in turn, and then weld with the connecting piece.

[0004] However, since the length of the existing pole lug is designed as equal length, the free end of each pole lug is seriously misaligned when stacking and welding due to the bending of the pole lug, thereby affecting the welding effect between each pole lug and the connecting piece, and affecting the battery performance.

[0005] In the related art, the length of the pole lug is usually changed to realize the alignment of the end part of the pole lug after bending, thereby improving the welding effect and avoiding the cutting of the end part of the pole lug.

[0006] However, increasing the length of the pole lug will increase the resistance of the pole lug, and different pole lug resistances will cause resistance differences between different pole pieces, thereby reducing the consistency and overall performance of the battery cell. INVENTION CONTENTS

[0007] The utility model provides a kind of battery cell, battery and electric equipment to solve or improve the problem that the resistance of pole lug increases in the related art by increasing the length of pole lug, and different pole lug resistances will cause resistance differences between different pole pieces, thereby reducing the consistency and overall performance of the battery cell.

[0008] In a first aspect, the utility model provides a kind of battery cell, with the first direction X, the second direction Y and the third direction Z that intersect each other, comprising:

[0009] battery cell body;

[0010] pole lug group, from the side of the battery cell body, the pole lug group includes multiple pole lugs arranged in the third direction Z in turn, with the pole lug along the second direction Y smallest size as reference pole lug, along the direction close to the reference pole lug to away from the reference pole lug, the size of the rest of the pole lug along the second direction Y increases in turn, so that the end part of each pole lug is flush when the rest of the pole lug is folded in turn towards the direction of the reference pole lug;

[0011] The size of each tab along the second direction Y is L, and the size of each tab along the first direction X is H. The ratio of L to H of each tab is equal, so that the resistance of each tab remains the same.

[0012] In an alternative embodiment, the size of each of the two adjacent tabs along the second direction Y is the same.

[0013] In an alternative embodiment, each of the tabs is uniformly spaced along the third direction Z, and the distance between two adjacent tabs along the third direction Z is K.

[0014] The size of the reference tab along the second direction Y is L1, and the size of the remaining tabs along the second direction Y from the direction close to the reference tab to the direction away from the reference tab is L2 to L i wherein L i i≥2.

[0015] In an alternative embodiment, the battery cell body comprises a plurality of positive electrode sheets, a plurality of negative electrode sheets, and a plurality of separators. The positive electrode sheets and the negative electrode sheets are alternately arranged along the third direction Z, and the separators are arranged between the positive electrode sheets and the negative electrode sheets.

[0016] The tab group comprises a positive tab group and a negative tab group. At least one of the positive tab group and the negative tab group is provided with the reference tab. The positive tab group comprises a plurality of positive tabs arranged in sequence along the third direction Z, and the positive tabs are connected to the positive electrode sheets. The negative tab group comprises a plurality of negative tabs arranged in sequence along the third direction Z, and the negative tabs are connected to the negative electrode sheets.

[0017] The distance between two adjacent positive tabs along the third direction Z is K1, and the distance between two adjacent negative tabs along the third direction Z is K2, wherein K=K1=K2.

[0018] In an alternative embodiment, the positive electrode sheet comprises a positive current collector and a positive active material layer arranged on at least one side of the positive current collector, and the positive current collector is connected to the positive tab.

[0019] The negative electrode sheet comprises a negative current collector and a negative active material layer arranged on at least one side of the negative current collector, and the negative current collector is connected to the negative tab.

[0020] In the third direction Z, the size of the positive tab is G1, the size of the single-sided positive active material layer is G2, the size of the negative tab is G3, the size of the single-sided negative active material layer is G4, and the size of the diaphragm is G5, wherein K=G1+G3+n1*G2+n2*G4+2*G5, n1 is 1 or 2, and n2 is 1 or 2.

[0021] In an optional embodiment, in the third direction Z, the reference tab is located in the middle of the tab group, and the remaining tabs are arranged symmetrically about the reference tab to form an inverted triangular distribution.

[0022] In an optional embodiment, the tab comprises:

[0023] A tab root connected to the cell body;

[0024] A tab folding part connected to the tab root, and the tab folding parts of the remaining tabs are sequentially folded towards the tab folding part of the reference tab.

[0025] In an optional embodiment, a tab welding area is arranged on the tab, the tab welding area is located at one end of the tab folding part away from the tab root, and the projections of the plurality of tab welding areas in the third direction Z completely overlap after welding.

[0026] In a second aspect, the utility model also provides a battery comprising the cell as described in any of the above.

[0027] In a third aspect, the utility model also provides a power consumption device comprising the battery as described above.

[0028] The cell provided by the utility model has the advantages that the length gradient of the tab is designed, the end of the tab is flush after folding, cutting after welding is avoided, the generation of metal debris is reduced, and the safety of the battery is improved. In addition, the length-width ratio of the tab is equal, the resistance of the tab with the length gradient is consistent, the resistance difference between different tabs is reduced, and the consistency and overall performance of the cell are improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the specific embodiments of the utility model or the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0030] Figure 1 It is a side view of the cell of the utility model embodiment.

[0031] Figure 2 The drawing is a schematic view of the ear folding and welding of the embodiment of the utility model;

[0032] Figure 3 The drawing is a partial enlarged schematic view of the folded ear of the embodiment of the utility model;

[0033] Figure 4 The drawing is a partial structure schematic view of the cell screenshot of the embodiment of the utility model;

[0034] Figure 5 The drawing is a front view of the cell of the embodiment of the utility model.

[0035] Mark explanation:

[0036] 1, cell body; 101, positive plate; 1011, positive current collector; 1012, positive active material layer; 102, negative plate; 1021, negative current collector; 1022, negative active material layer; 103, diaphragm; 2, ear group; 201, positive ear; 202, negative ear; 3, reference ear; 4, ear root; 5, ear folding part; 6, ear welding area; 7, ear folding tool. Specific implementation

[0037] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be described clearly and completely below in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0038] The cell, battery and electric equipment of the embodiment of the utility model will be described below in combination with Figures 1 to 5 .

[0039] According to the embodiment of the utility model, on the one hand, a kind of cell is provided, suitable for winding type battery or laminated battery, with first direction X, second direction Y and third direction Z intersecting each other in twos. Specifically, as shown in Figure 1 , the cell includes cell body 1 and ear group 2, and ear group 2 extends from one side of cell body 1. Ear group 2 includes a plurality of ears arranged in third direction Z in sequence.

[0040] As shown in Figure 1As shown, the tab with the smallest dimension along the second direction Y is designated as the reference tab 3. Along the direction from near to far from the reference tab 3, the dimensions of the remaining tabs along the second direction Y increase sequentially, so that when the remaining tabs are bent and folded towards the reference tab 3, the ends of each tab are flush. It should be noted that, as shown... Figure 1 and Figure 5 Regarding the placement of the battery cells shown, the first direction X in the diagram represents the width direction of the tab, the second direction Y represents the length direction of the tab, and the third direction Z represents the thickness direction of the tab.

[0041] It is understandable that, such as Figure 1 As shown, among the multiple tabs arranged sequentially along the third direction Z, the reference tab 3 is the shortest. From both sides of the reference tab 3 towards the outer tabs, the outer tabs increase in length relative to the reference tab 3, exhibiting a gradient change. Figure 2 As shown, during the tab-gathering welding process, tab-gathering fixture 7 is used to shape the tabs. This ensures that the ends of the tabs are flush after gathering, effectively guaranteeing the welding effect and improving battery performance.

[0042] And as Figure 5 As shown, the dimension of the tab along the second direction Y, i.e., the tab length, is L, and the dimension of the tab along the first direction X, i.e., the tab width, is H. The ratio of L to H for each tab is equal to ensure that the resistance of each tab remains the same. It can be understood that the conductor resistance... Where ρ represents resistivity, L represents the length of the conductor (i.e., the tab length), and S represents the cross-sectional area of ​​the conductor (i.e., the tab cross-sectional area). Since the resistivity ρ is a constant, the tab resistance... That is, the resistance of different electrodes can be kept consistent by controlling the ratio of the electrode length to the electrode cross-sectional area.

[0043] like Figure 5 As shown, the length of the tab is L, and the width of the tab is H. Therefore, the cross-sectional area of ​​the tab is S = G × H, where G represents the conductor thickness, i.e., the tab thickness. Thus, the tab resistance... Since the tab thickness G and resistivity ρ are generally constant, the tab resistance... That is, the resistance of the tab is directly proportional to the aspect ratio of the tab. Therefore, when the aspect ratio of the tabs is the same, the resistance of the tabs is also approximately equal. This improves the problem of inconsistent tab lengths L caused by making the ends of the tabs flush after they are folded together, which leads to inconsistent resistance between different tabs and ultimately causes resistance differences between different electrodes.

[0044] In this way, by designing the length gradient of the tab, the end of the tab after folding is flush, avoiding cutting after welding, reducing the generation of metal debris, and improving the safety of the battery. By setting the aspect ratio of the tab to be equal, the length gradient of the tab can also maintain consistent resistance, reducing the resistance difference between different tabs, and improving the consistency and overall performance of the battery.

[0045] In some embodiments of the present application, as shown in Figure 1 , the difference in size of the adjacent two tabs along the second direction Y is the same. In this way, the length of the tab changes regularly along the second direction Y, which is easy to manufacture and assemble, improves the assembly accuracy of the battery, and is beneficial to the folding and regularity of the tab, ensuring the performance and reliability of the battery.

[0046] In some embodiments of the present application, as shown in Figure 1 and Figure 3 , each tab is uniformly spaced in the third direction Z; and the distance between the adjacent two tabs along the third direction Z is K. The size of the reference tab 3 along the second direction Y is L1, and along the direction from the reference tab 3 to the reference tab 3, the size of the remaining tab along the second direction Y is L2 to L i , wherein L i = L1+K×(i-1), i≥2.

[0047] Specifically, as shown in Figure 3 , the folded tab structure is enlarged, the bending part of the tab is approximately right-angled, forming the structure shown, and the distance between adjacent tabs is K. The reference tab 3 is the first tab, and the second, third, i-1, and i tabs are distributed outward from both sides of the reference tab 3, and the value of i is set when the battery is designed.

[0048] Therefore, along the second direction Y, the length of the tab in the tab folding part is M, and the length of the tab in the tab root part is N, then the length of the reference tab 3, i.e. the first tab, is L1=M1+N1, the length of the second tab is L2=L1+K 1-2 , and so on, the length of the i-th tab L i is

[0049] L i =L i-1 +K (i-1)-i =L1+K 1-2 +K 2-3 +……+K (i-1)-i . Wherein, K (i-1)-i is the distance between the i-1th tab and the i-th tab, and since the distance between adjacent tabs is K, K 1-2 =K 2-3 =……=K(i-1)-i =K, therefore the length L of the i-th pole piece is... i for

[0050] L i =L1+K×(i-1). By approximating the bend of the tab with a right angle, the tab length L is made easier to calculate and formulatize, thus facilitating the setting of the tab length L during cell design.

[0051] Since the aspect ratio of the electrodes is the same, that is Therefore, based on the above formula for calculating the length of the tab, when designing a battery cell, given the length L1 and width H1 of the reference tab 3, the width H of the i-th tab can be obtained. i for This makes it easier to calculate and formulate the tab width H, which in turn facilitates the setting of the tab width H during cell design.

[0052] In some embodiments of this utility model, the battery cell body 1 includes a plurality of positive electrode plates 101, a plurality of negative electrode plates 102, and a plurality of separators 103. For example... Figure 4 As shown, along the third direction Z, positive electrode 101 and negative electrode 102 are alternately arranged, and separator 103 is disposed between positive electrode 101 and negative electrode 102. The number of positive electrode 101, negative electrode 102 and separator 103 in the cell body 1 needs to be determined according to the actual design requirements.

[0053] The electrode group 2 includes a positive electrode group and a negative electrode group, at least one of which has a reference electrode 3. The positive electrode group includes a plurality of positive electrodes 201 arranged sequentially along the third direction Z, and the positive electrodes 201 are correspondingly connected to the positive electrode plate 101. The negative electrode group includes a plurality of negative electrodes 202 arranged sequentially along the third direction Z, and the negative electrodes 202 are correspondingly connected to the negative electrode plate 102. Along the third direction Z, the distance between two adjacent positive electrodes 201 is K1, and the distance between two adjacent negative electrodes 202 is K2, where K = K1 = K2.

[0054] Understandably, along the third direction Z, positive and negative tabs are alternately distributed, with multiple positive tabs 201 forming a positive tab group and multiple negative tabs 202 forming a negative tab group. In the positive tab group, each positive tab 201 is closed and welded together to connect to the positive terminal, forming a positive current path. In the negative tab group, each negative tab 202 is closed and welded together to connect to the negative terminal, forming a negative current path. In practical applications, the distance between two adjacent positive tabs 201 is equal to the distance between two adjacent negative tabs 202, which is the distance K.

[0055] Specifically, in some embodiments, in the positive tab group, the tab 3 with the smallest size of the positive tab 201 along the second direction Y is taken as a reference tab 3. Along the direction from close to the reference tab 3 to away from the reference tab 3, the size L of the remaining positive tabs 201 along the second direction Y is sequentially increased, so that when the remaining positive tabs 201 are sequentially folded towards the direction of the reference tab 3, the end portions of the respective positive tabs 201 are flush. And the ratio of L to H of each positive tab 201 is equal, so that the resistance of each positive tab 201 remains the same.

[0056] In other embodiments, in the negative tab group, the tab 3 with the smallest size of the negative tab 202 along the second direction Y is taken as a reference tab 3. Along the direction from close to the reference tab 3 to away from the reference tab 3, the size L of the remaining negative tabs 202 along the second direction Y is sequentially increased, so that when the remaining negative tabs 202 are sequentially folded towards the direction of the reference tab 3, the end portions of the respective negative tabs 202 are flush. And the ratio of L to H of each negative tab 202 is equal, so that the resistance of each negative tab 202 remains the same.

[0057] In yet other embodiments, in the positive tab group, the tab 3 with the smallest size of the positive tab 201 along the second direction Y is taken as a reference tab 3. Along the direction from close to the reference tab 3 to away from the reference tab 3, the size L of the remaining positive tabs 201 along the second direction Y is sequentially increased, so that when the remaining positive tabs 201 are sequentially folded towards the direction of the reference tab 3, the end portions of the respective positive tabs 201 are flush. And the ratio of L to H of each positive tab 201 is equal, so that the resistance of each positive tab 201 remains the same.

[0058] Meanwhile, in the negative tab group, the tab 3 with the smallest size of the negative tab 202 along the second direction Y is taken as a reference tab 3. Along the direction from close to the reference tab 3 to away from the reference tab 3, the size L of the remaining negative tabs 202 along the second direction Y is sequentially increased, so that when the remaining negative tabs 202 are sequentially folded towards the direction of the reference tab 3, the end portions of the respective negative tabs 202 are flush. And the ratio of L to H of each negative tab 202 is equal, so that the resistance of each negative tab 202 remains the same.

[0059] In some embodiments of the present application, as shown in Figure 4 The positive tab 201 is connected with the positive sheet 101. The positive tab 201 and the positive sheet 101 can be connected together by welding, pressure welding or the like, or the positive tab 201 can be integrally formed with the positive current collector 1011.

[0060] The negative electrode sheet 102 includes a negative electrode current collector 1021 and a negative electrode active material layer 1022 arranged on at least one side of the negative electrode current collector 1021, and the negative electrode current collector 1021 is connected with the negative electrode tab 202. The negative electrode tab 202 and the negative electrode sheet 102 can be connected together by welding, pressure bonding or the like, or the negative electrode tab 202 can be integrally formed with the negative electrode current collector 1021.

[0061] Specifically, the tab layer spacing K is calculated taking the positive electrode tab 201 as an example, as shown in Figure 4 In the third direction Z, the size of the positive electrode tab 201 is G1, the size of the single-sided positive electrode active material layer 1012 is G2, the size of the negative electrode tab 202 is G3, the size of the single-sided negative electrode active material layer 1022 is G4, and the size of the separator 103 is G5. Then, the spacing K1 between the two adjacent positive electrode tabs 201, that is, the spacing K, is:

[0062] K=G1+G3+n1xG2+n2xG4+2xG5, n1 is 1 or 2, and n2 is 1 or 2. That is, if the current collector is provided with an active material layer on one side, the values of n1 and n2 are 1; if the current collector is provided with an active material layer on both sides, the values of n1 and n2 are 2. It can be understood that G1, G2, G3, G4 and G5 generally fluctuate less in the production process and can be regarded as constant values, so that the tab layer spacing K is a fixed value, and thus the size L of the tab along the second direction Y can be further obtained i .

[0063] In some embodiments of the present application, as shown in Figure 1 In the third direction Z, the reference tab 3 is located in the middle of the tab group 2, and the remaining tabs are symmetrically arranged about the reference tab 3 to form an inverted triangular distribution. In this way, when the outer layer tabs on both sides of the reference tab 3 are folded towards the middle, the tab folding tool 7 is used to shape the tabs so that the root part is tightly attached to the end of the battery core body 1, and the shape is as shown in Figure 2 Of course, in other embodiments, the position of the reference tab 3 includes but is not limited to the middle position of the tab group 2, and any tab can be regarded as the reference tab 3 according to the different tab folding positions of the battery core design, for example, the reference tab 3 is located at the end position of the tab group 2.

[0064] In some embodiments of the present application, as shown in Figure 3As shown, the tab includes a tab root 4 and a tab folding portion 5. Specifically, the tab root 4 is connected with the battery body 1. The tab folding portion 5 is connected with the tab root 4, and the tab folding portions 5 of the remaining tabs are sequentially folded towards the tab folding portion 5 of the reference tab 3. In this way, the tab root 4 is closely connected with the battery body 1, ensuring that the current can be smoothly transmitted from the battery body 1 to the tab. The tab folding portion 5 is connected with the tab root 4, and is the part of the tab that extends outward and is folded. The tab folding portions 5 of the other tabs are sequentially folded towards the tab folding portion 5 of the reference tab 3, which helps to improve the overall compactness of the battery and facilitates connection with external circuits.

[0065] In some embodiments of the present application, as shown in Figure 2 As shown, the tab is provided with a tab welding area 6, which is located at one end of the tab folding portion 5 away from the tab root 4, so as to weld the end of the tab folding portion 5 to fix all the tabs together. After welding of the multiple tab folding portions, the projections of the multiple tab welding areas 6 in the third direction Z completely overlap. In this way, after welding of the multiple tabs, the projections of the tab welding areas 6 of the multiple tabs in the third direction Z all overlap together, so that all the welding points are at the same height, which can more easily realize a planar connection structure, and helps to improve the efficiency and reliability of battery assembly, and can reduce errors and failures in the assembly process.

[0066] According to the embodiments of the present application, on the other hand, a battery is also provided, which includes the battery cell in any of the above embodiments. In this way, by designing the length gradient variation of the tab, the ends of the tab folding portions are flush after folding, avoiding cutting after welding, reducing the generation of metal debris, and improving the safety of the battery. By setting the aspect ratio of the tab to be equal, the length gradient variation of the tab can also maintain consistent resistance, reducing the resistance difference between different tabs, and improving the consistency and overall performance of the battery cell. The derivation process of the beneficial effects of the battery is similar to the derivation process of the beneficial effects of the battery cell, and therefore will not be described here.

[0067] According to the embodiments of the present application, on the other hand, a battery is also provided, which includes the battery cell in any of the above embodiments. In this way, by designing the length gradient variation of the tab, the ends of the tab folding portions are flush after folding, avoiding cutting after welding, reducing the generation of metal debris, and improving the safety of the battery. By setting the aspect ratio of the tab to be equal, the length gradient variation of the tab can also maintain consistent resistance, reducing the resistance difference between different tabs, and improving the consistency and overall performance of the battery cell. The derivation process of the beneficial effects of the battery is similar to the derivation process of the beneficial effects of the battery cell, and therefore will not be described here.

[0068] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope of the appended claims.

Claims

1. An electric cell, characterized by, Having a first direction (X), a second direction (Y) and a third direction (Z) intersecting with each other, comprising: a cell body (1); a tab group (2) extending from one side of the cell body (1), the tab group (2) comprising a plurality of tabs arranged in sequence along the third direction (Z), wherein the tab with the smallest dimension along the second direction (Y) is a reference tab (3), and the dimensions of the remaining tabs along the second direction (Y) increase in sequence from the direction close to the reference tab (3) to the direction away from the reference tab (3), so that when the remaining tabs are sequentially folded towards the direction of the reference tab (3), the end portions of each tab are flush; and the dimension of the tab along the second direction (Y) is L, the dimension of the tab along the first direction (X) is H, and the ratio of L to H of each tab is equal, so that the resistance of each tab remains the same.

2. The electric cell of claim 1, wherein, The difference in the dimension of the adjacent two tabs along the second direction (Y) is the same.

3. The electric cell of claim 2, wherein, Each tab is uniformly spaced in the third direction (Z), and the spacing between adjacent two tabs along the third direction (Z) is K; The size of the reference tab (3) along the second direction (Y) is L1, and the sizes of the remaining tabs along the second direction (Y) are L2 to L i wherein L i = L1+ K x (i-1), i≥2.

4. The electric cell of claim 3, wherein, The cell body (1) comprises a plurality of positive electrode sheets (101), a plurality of negative electrode sheets (102) and a plurality of separators (103), and the positive electrode sheets (101) and the negative electrode sheets (102) are alternately arranged along the third direction (Z), and the separators (103) are arranged between the positive electrode sheets (101) and the negative electrode sheets (102); The tab group (2) comprises a positive tab group and a negative tab group, at least one of the positive tab group and the negative tab group is provided with the reference tab (3); the positive tab group comprises a plurality of positive tabs (201) arranged in sequence along the third direction (Z), and the positive tabs (201) are connected with the positive electrode sheets (101); the negative tab group comprises a plurality of negative tabs (202) arranged in sequence along the third direction (Z), and the negative tabs (202) are connected with the negative electrode sheets (102); The spacing between adjacent two positive tabs (201) along the third direction (Z) is K1, and the spacing between adjacent two negative tabs (202) along the third direction (Z) is K2, wherein K=K1=K2.

5. The electric cell of claim 4, wherein, The positive electrode sheet (101) comprises a positive current collector (1011) and a positive active material layer (1012) arranged on at least one side of the positive current collector (1011), and the positive current collector (1011) is connected with the positive tab (201); The negative electrode sheet (102) comprises a negative current collector (1021) and a negative active material layer (1022) arranged on at least one side of the negative current collector (1021), and the negative current collector (1021) is connected with the negative tab (202); In the third direction (Z), the size of the positive tab (201) is G1, the size of the single-sided positive active material layer (1012) is G2, the size of the negative tab (202) is G3, the size of the single-sided negative active material layer (1022) is G4, and the size of the separator (103) is G5, wherein K=G1+G3+n1×G2+n2×G4+2×G5, n1 is 1 or 2, and n2 is 1 or 2.

6. The electric cell of any one of claims 1 to 5, wherein, In the third direction (Z), the reference tab (3) is located in the middle of the tab group (2), and the remaining tabs are symmetrically arranged with respect to the reference tab (3) to form an inverted triangular distribution.

7. The electric cell of any one of claims 1 to 5, wherein, The tab includes: a tab root (4) connected with the battery cell body (1); a tab folding part (5) connected with the tab root (4), and the tab folding parts (5) of the remaining tabs are sequentially folded towards the tab folding part (5) of the reference tab (3).

8. The electric cell of claim 7, wherein, The tab is provided with a tab welding area (6), which is located at one end of the tab folding part (5) away from the tab root (4). After welding of multiple tabs, the projections of multiple tab welding areas (6) in the third direction (Z) completely overlap.

9. A battery, characterized by The battery cell includes any one of the battery cells according to claims 1 to 8.

10. An electric device, characterized by The battery includes the battery according to claim 9.

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