A battery and an electric device

Abstract

The utility model relates to battery technical field discloses a kind of battery and electric equipment, battery includes electrode assembly, electrode assembly includes first pole piece, and first pole piece includes first pole piece ontology and multiple pole lug groups.Pole lug group includes at least one pole lug, each pole lug is set to the one end of first pole piece ontology along third direction, and is stacked along second direction setting.The width of all pole lug in the same pole lug group group along first direction is same.First pole piece ontology is wound setting, and the starting end of first pole piece ontology winding is first end, and winding end is second end;From first end to second end, the pole lug width of each pole lug group first decreases and then increases, and the pole lug width of first pole lug group from first end is greater than the pole lug width of last pole lug group.The battery of the utility model can improve the problem that the overall width of battery pole lug increases caused by the misplacement of pole lug, while ensuring that there is enough overlapping area between adjacent pole lug of outer ring.

Description

Technical Field

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

[0002] Currently, both the positive and negative electrodes of wound batteries have a multi-tab structure, and the positive and negative electrodes are wound together with the separator to form a bare cell during the winding process. Due to factors such as the thickness fluctuation of the electrodes and the separator, electrode misalignment is prone to occur after winding, affecting the yield of the winding process and also affecting the performance of the battery cells.

[0003] Therefore, there is an urgent need for a battery and electrical device to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a battery and electrical device that improves the problem of increased overall width of the tabs caused by misalignment of the tabs, while ensuring sufficient overlap between adjacent tabs on the outer ring.

[0005] To achieve this objective, the present invention adopts the following technical solution: A battery includes an electrode assembly, the electrode assembly including a first electrode plate, the electrode assembly having a first direction, a second direction and a third direction that are perpendicular to each other, the first electrode plate including a first electrode plate body and a plurality of tabs; The electrode assembly includes at least one electrode, each electrode being disposed at one end of the first electrode body along the third direction, and stacked along the second direction; All the electrodes within the same electrode group have the same width along the first direction; The first electrode body is wound up, with the starting end of the winding of the first electrode body being the first end and the ending end of the winding being the second end. Each of the electrode tab groups is arranged sequentially along the direction from the first end to the second end. From the first end to the second end, the tab width of each of the electrode tab groups first decreases and then increases, and the tab width of the first electrode tab group starting from the first end is greater than the tab width of the last electrode tab group.

[0006] As an improvement to the above technical solution, from the first end to the second end, the width of the tabs of each tab group first decreases linearly and then increases linearly, or first decreases exponentially and then increases exponentially.

[0007] As an improvement to the above technical solution, when the electrode group includes multiple electrodes, all electrodes in the electrode group have the same height along the third direction; From the first end to the second end, the height of the electrode tabs in each electrode tab group decreases.

[0008] As an improvement to the above technical solution, from the first end to the second end, the height of the electrode tabs of each electrode tab group decreases linearly or exponentially.

[0009] As an improvement to the above technical solution, the first electrode is wound N turns, with at least one electrode tab provided in each turn.

[0010] As an improvement to the above technical solution, the number of electrodes in each electrode group is equal and not less than two.

[0011] As an improvement to the above technical solution, the first electrode sheet is provided with one electrode tab per revolution, and the number of electrode tabs in each electrode tab group is two.

[0012] As an improvement to the above technical solution, for the same electrode tab, the width of the electrode tab gradually decreases from the end of the electrode tab closest to the first electrode body to the end of the electrode tab furthest from the first electrode body.

[0013] As an improvement to the above technical solution, the electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The separator is sandwiched between the positive electrode plate and the negative electrode plate. The positive electrode plate, the negative electrode plate, and the separator are wound to form the electrode assembly. The positive electrode plate and / or the negative electrode plate is the first electrode plate.

[0014] An electrical device comprising a battery as described in any of the preceding claims, the battery being used to provide electrical energy.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: In this battery, the tab width of the tab group gradually decreases from the first end to the second end of the first electrode body. After the tab width decreases to a certain extent, the tab width of subsequent tab groups gradually increases to avoid the tab width being too small. This ensures that even if tab misalignment occurs during winding, there is a sufficient overlap area between the subsequent tabs on the outer ring and the previous tabs, guaranteeing the battery's current carrying capacity. Furthermore, the width of the tabs in the first tab group is greater than the width of the tabs in the last tab group and also greater than the width of the tabs in the middle tab groups, so that even if tab misalignment occurs during winding... Misalignment can also reduce the amount of misalignment to a certain extent and will not significantly increase the overall width of the tabs (the width of the tabs in the first tab group is greater than the width of the tabs in the last tab group, so that when " / " or "\" shaped misalignment occurs during winding, it will not significantly increase the overall width of all positive tabs and all negative tabs; similarly, the width of the tabs in the first tab group is greater than the width of the tabs in the middle tab group, so that when inverted "C" shaped misalignment or "C" shaped misalignment occurs during winding, it will not significantly increase the overall width of all positive tabs and all negative tabs). In summary, the battery of this invention can reduce the amount of tab misalignment, improve the problem of increased overall width of battery tabs caused by tab misalignment, and at the same time ensure sufficient overlap between adjacent tabs on the outer ring. Attached Figure Description

[0016] Figure 1 This is an exploded view of the battery provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the structure of the electrode assembly provided in this embodiment of the utility model; Figure 3 This is an isometric view of the electrode assembly provided in this embodiment of the present invention; Figure 4 This is a top view of the electrode assembly provided in an embodiment of the present utility model; Figure 5 This is a front view of the electrode assembly provided in an embodiment of the present invention; Figure 6 This is a front view of the first electrode sheet provided in this embodiment of the present invention when it is not wound.

[0017] In the picture: X, first direction; Y, second direction; Z, third direction; 1. Housing; 11. Receiving cavity; 2. Electrode assembly; 21. First electrode; 211. First electrode body; 2111. First end; 2112. Second end; 212. Tab assembly; 2121. Tab; 22. Positive electrode; 23. Negative electrode; 24. Diaphragm; 3. Top cover. Detailed Implementation

[0018] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0019] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0022] like Figures 1-6 As shown, this embodiment provides a battery, including a housing 1 and an electrode assembly 2. The housing 1 has a receiving cavity 11 and a top cover 3, the top cover 3 sealing the receiving cavity 11, and the electrode assembly 2 located in the receiving cavity 11. The electrode assembly 2 has a wound structure.

[0023] The electrode assembly 2 includes a first electrode 21. The electrode assembly 2 has two perpendicular directions: a first direction X, a second direction Y, and a third direction Z. The first electrode 21 includes a first electrode body 211 and a plurality of tab groups 212. Each tab group 212 includes at least one tab 2121. Each tab 2121 is disposed at one end of the first electrode body 211 along the third direction Z and is stacked along the second direction Y. All tabs 2121 within the same tab group 212 have the same width along the first direction X. The first electrode body 211 is wound up, with the starting end of the winding being the first end 2111 and the ending end being the second end 2112. Each tab group 212 is arranged sequentially along the direction from the first end 2111 to the second end 2112. From the first end 2111 to the second end 2112, the width of the tabs 2121 of each tab group 212 first decreases and then increases, and the width of the tabs 2121 of the first tab group 212 starting from the first end 2111 is greater than the width of the tabs 2121 of the last tab group 212. The first tab group 212 starting from the first end 2111 is also the tab group 212 on the first electrode 21 that is closest to the first end 2111, and the last tab group 212 is the tab group 212 on the first electrode 21 that is farthest from the first end 2111 (and also the tab group 212 that is closest to the second end 2112). The width of the tab 2121 along the first direction X is the maximum dimension of the portion of the tab 2121 exposed outside the first electrode body 211 along the first direction X.

[0024] In the battery provided in this embodiment, from the first end 2111 of the first electrode body 211 to the second end 2112 of the first electrode body 211, the width of the tabs 2121 of the tab group 212 gradually decreases. After the width of the tabs 2121 decreases to a certain extent, the width of the tabs 2121 of subsequent tab groups 212 gradually increases. This avoids the tabs 2121 being too small, so that when the tabs 2121 are misaligned during the winding process, there is a sufficiently wide overlap area between the subsequent tabs 2121 of the outer ring and the previous tabs 2121, ensuring the battery's current carrying capacity. Furthermore, the width of the tabs 2121 of the first tab group 212 is greater than the width of the tabs 2121 of the last tab group 212 and also greater than the width of the tabs 2121 of the middle tab group 212. The width is such that even if the tabs 2121 are misaligned during the winding process, the amount of misalignment can be reduced to a certain extent, and the overall width of the battery tabs 2121 will not be significantly increased. (The width of the tabs 2121 in the first tab group 212 is greater than the width of the tabs 2121 in the last tab group 212, so that when “ / ” or “\” type misalignment occurs during the winding process, the overall width of all positive tabs and the overall width of all negative tabs will not be significantly increased. The width of the tabs 2121 in the first tab group 212 is greater than the width of the tabs 2121 in the middle tab group 212, so that when an inverted “C” type misalignment or a “C” type misalignment occurs during the winding process, the overall width of all positive tabs and the overall width of all negative tabs will not be significantly increased.)

[0025] In summary, the battery provided in this embodiment can reduce the misalignment of the tabs 2121, improve the problem of increased overall width of the battery tabs 2121 (overall width of all positive tabs and overall width of all negative tabs) caused by the misalignment of the tabs 2121, and at the same time ensure that there is sufficient overlap between adjacent tabs 2121 on the outer ring to ensure the current carrying capacity of the tabs 2121.

[0026] Furthermore, such as Figure 6 As shown, from the first end 2111 of the first electrode body 211 to the second end 2112 of the first electrode body 211, the width of the tabs 2121 of each tab group 212 first decreases linearly and then increases linearly, or first decreases exponentially and then increases exponentially.

[0027] Specifically, from the first end 2111 to the second end 2112 of the first electrode body 211, the width of the tabs 2121 of each tab group 212 first decreases linearly and then increases linearly. This means that the difference between the widths of the tabs 2121 of any two adjacent tab groups 212 is equal. The linear change in the width of the tabs 2121 of the tab group 212 facilitates the processing and manufacturing of the first electrode 21.

[0028] From the first end 2111 of the first electrode body 211 to the second end 2112 of the first electrode body 211, the width of the tabs 2121 of each tab group 212 first decreases exponentially and then increases exponentially. This means that, from the first end 2111 of the first electrode body 211 to the second end 2112 of the first electrode body 211, the ratio of the change in width of the tabs 2121 of the later tab group 212 to the width of the tabs 2121 of the earlier tab group 212 is a constant value. For example, from the first end 2111 of the first electrode body 211 to the second end 2112 of the first electrode body 211, the width of the tabs 2121 of each tab group 212 first gradually decreases by a ratio of 3%, and then gradually increases by a ratio of 3%. The width of the tabs 2121 in each tab group 212 is gradually reduced proportionally. This method of reducing the width of the tabs 2121 in the tab group 212 allows the reduction in the width of the tabs 2121 in the tab group 212 to be gradual, avoiding the tabs 2121 from decreasing too quickly and becoming too small. Then, the width of the tabs 2121 in each tab group 212 is gradually increased proportionally. This method of increasing the width of the tabs 2121 in the tab group 212 allows the width of the tabs 2121 in the tab group 212 to increase rapidly, ensuring that the tabs 2121 in the outer ring tab group 212 have sufficient width to guarantee the overall current carrying capacity of the battery tabs 2121.

[0029] Optionally, such as Figure 3 and Figure 6 As shown, when the tab group 212 includes multiple tabs 2121, all tabs 2121 within the tab group 212 have the same height along the third direction Z. That is to say, if there are multiple tabs 2121 within a tab group 212, then the width and height of these tabs 2121 are the same.

[0030] Furthermore, such as Figure 3 , Figure 5 and Figure 6 As shown, from the first end 2111 of the first electrode body 211 to the second end 2112 of the first electrode body 211, the height of the tabs 2121 of each tab group 212 gradually decreases.

[0031] Those skilled in the art will understand that, given a fixed width, the greater the height of the cut tab 2121, the more likely the top of the tab 2121 will sag due to lack of support under the influence of its own weight and insufficient material strength. Consequently, it will collide with the cut surface of the roller during the conveyor belt movement, causing the tab 2121 to fold over. Therefore, reducing the height of the tab 2121 can effectively reduce the folding of the tab 2121. During the winding of the first electrode 21, the tabs 2121 of each tab group 212 are stacked sequentially with the tabs 2121 in front. Therefore, along the winding direction of the first electrode 21, the later the tab group 212, the longer the belt travel time required for it to form a stack with the tabs 2121 in front. This also makes the tabs 2121 of the later tab group 212 more prone to drooping during the winding of the first electrode 21. Therefore, in this embodiment, from the first end 2111 to the second end 2112 of the first electrode body 211, the height of the tabs 2121 of each tab group 212 gradually decreases to reduce the probability that the tabs 2121 will fold due to drooping and collision with the roller surface during the winding of the first electrode 21.

[0032] Furthermore, from the first end 2111 of the first electrode body 211 to the second end 2112 of the first electrode body 211, the height of the tabs 2121 of each tab group 212 decreases linearly or exponentially.

[0033] Specifically, from the first end 2111 to the second end 2112 of the first electrode body 211, the height of the tabs 2121 of each tab group 212 decreases linearly. This means that the height difference between the tabs 2121 of any two adjacent tab groups 212 is equal; for example, the height difference between the tabs 2121 of any two adjacent tab groups 212 is 1 mm. This linear change in the height of the tabs 2121 of each tab group 212 from the first end 2111 to the second end 2112 of the first electrode body 211 facilitates the processing and manufacturing of the first electrode 21.

[0034] From the first end 2111 to the second end 2112 of the first electrode body 211, the height of the tabs 2121 of each tab group 212 decreases exponentially. This means that the ratio of the height reduction of the tabs 2121 in each tab group 212 to the height of the tabs 2121 in the previous tab group 212 is a constant. For example, from the first end 2111 to the second end 2112 of the first electrode body 211, the height of the tabs 2121 in each tab group 212 decreases by a ratio of three percent. This proportional decrease in the height of the tabs 2121 avoids the tabs 2121 decreasing too rapidly, which could result in the outer ring of tabs 2121 being too low.

[0035] Specifically, in this embodiment, from the first end 2111 of the first electrode body 211 to the second end 2112 of the first electrode body 211, the height of the tabs 2121 of each tab group 212 decreases linearly, and the width first decreases linearly and then increases linearly.

[0036] Optionally, such as Figure 3 , Figure 5 and Figure 6 As shown, for the same tab 2121, the width of the tab 2121 gradually decreases from the end of the tab 2121 that is close to the first electrode body 211 to the end of the tab 2121 that is away from the first electrode body 211.

[0037] Those skilled in the art will understand that, given a fixed height, the smaller the width of the cut-and-formed tab 2121, the more prone the top of the tab 2121 is to sag due to lack of support, especially given its own weight and insufficient material strength. This can lead to collisions with the roller surface during conveyor belt movement, causing the tab 2121 to fold over. In this embodiment, the tab 2121 is designed to be wider at the bottom and narrower at the top, which reduces the weight of the top of the tab 2121, improves the support effect of the lower part of the tab 2121 on the upper part, and reduces the probability of the top of the tab 2121 saging due to lack of support. Preferably, in this embodiment, the tab 2121 is an isosceles trapezoid that is narrower at the top and wider at the bottom. Since the tab 2121 in this embodiment is wider at the top and narrower at the bottom, the width of the tab 2121 in this embodiment is the width of the end of the tab 2121 closest to the first electrode body 211, that is, the width of the position where the tab 2121 connects with the first electrode body 211. Figure 6 The dimension shown in L.

[0038] Optionally, the first electrode 21 is wound into N turns, with at least one tab 2121 on each turn, to ensure that the first electrode 21 has a sufficient number of tabs 2121 to ensure that the battery has sufficient current-carrying area and current-carrying capacity.

[0039] like Figure 3 and Figure 4 As shown, in this embodiment, the first electrode 21 is provided with one tab 2121 per turn. In other embodiments, the first electrode 21 may be provided with two tabs 2121 per turn, or the first electrode 21 may be provided with two tabs 2121 in some turns and one tab 2121 in others.

[0040] Furthermore, the number of electrodes 2121 in each electrode group 212 is equal and not less than two. In this embodiment, each electrode group 212 includes two electrodes 2121.

[0041] In this embodiment, the first electrode plate 21 is provided with one tab 2121 per ring, and each tab group 212 includes two tabs 2121. That is to say, in this embodiment, the tabs 2121 located in the outermost and innermost rings have the same width and height as the tabs 2121 on one side, and there are no tabs 2121 on the other side. Except for the tabs 2121 located in the outermost and innermost rings, each tab 2121 has the same width and height as the tab 2121 on one side, and a different width and height than the tab 2121 on the other side. The tabs 2121 located in the outermost ring have the same width and height as the tabs 2121 located inside it, and the tabs 2121 located in the innermost ring have the same width and height as the tabs 2121 located outside it. In this embodiment, the innermost tab 2121 is the first tab 2121 starting from the first end 2111 (the tab 2121 closest to the first end 2111), and the outermost tab 2121 is the last tab 2121 starting from the first end 2111 (the tab 2121 closest to the second end 2112).

[0042] Optionally, the electrode assembly 2 includes a positive electrode 22 and a negative electrode 23, wherein the positive electrode 22 and / or the negative electrode 23 is a first electrode 21. In this embodiment, both the positive electrode 22 and the negative electrode 23 are first electrodes 21. That is to say, the electrode assembly 2 includes two electrodes, both of which are the first electrodes 21 in this embodiment.

[0043] Those skilled in the art will understand that the electrode assembly 2 should also include a diaphragm 24, which is sandwiched between the positive electrode 22 and the negative electrode 23, and the positive electrode 22, the negative electrode 23 and the diaphragm 24 are wound together to form the electrode assembly 2.

[0044] Both the positive electrode 22 and the negative electrode 23 use the first electrode 21, which enables the wound positive electrode 22 and negative electrode 23 to have the advantage of improving the problem of the overall width of the electrode 2121 increased due to the misalignment of the electrode tab 2121, while ensuring that there is enough overlap area between adjacent electrode tabs 2121 on the outer ring.

[0045] The misalignment of the first electrode 21 provided in this embodiment and the electrode tabs 2121 after winding is compared in the following table (the width of each electrode tab 2121 in the prior art mentioned in the table below is the same, and the width of the electrode tab 2121 with the largest width in this embodiment is the same as the width of the electrode tab 2121 in the prior art mentioned in the table below): Those skilled in the art will understand that if the tabs 2121 of the electrode assembly 2 do not misalign during the winding process, the overall width of all the positive tabs stacked along the second direction Y of the electrode assembly 2 along the first direction X is equal to the width of the positive tab with the largest width among all the positive tabs (in this embodiment, the positive tab with the largest width is also the positive tab located in the innermost ring of the electrode assembly 2). If the width of all the positive tabs is the same, the overall width of all the positive tabs along the first direction is equal to the width of each positive tab, and the same applies to the negative tabs.

[0046] When the tabs 2121 of the electrode assembly 2 are misaligned during the winding process, the misalignment of the positive tab is equal to the difference between the overall width of all the positive tabs stacked along the second direction Y along the first direction X and the width of the positive tab with the largest width among all the positive tabs. If the width of all the positive tabs is the same, the misalignment of the positive tab is equal to the difference between the overall width of all the positive tabs stacked along the second direction Y along the first direction X and the width of the positive tab. The same applies to the negative tab.

[0047] As shown in the table above, when the tab 2121 is misaligned, for " / " shaped and "\" shaped misalignments, since the width of the outermost tab 2121 in this embodiment is smaller than the width of the innermost tab 2121, the misalignment amount of the tab 2121 in this embodiment is less than that in the prior art. The reduction in the misalignment amount of the tab 2121 is equal to the difference between the width of the innermost tab 2121 and the width of the outermost tab 2121 in this embodiment. Half of the width difference; for inverted "C" type misalignment and "C" type misalignment, since the width of the middle tab 2121 in this embodiment is smaller than the width of the innermost and outermost tabs 2121, the misalignment amount of the tabs 2121 in the inverted "C" type misalignment and "C" type misalignment in this embodiment is less than the misalignment amount of the tabs 2121 in the inverted "C" type misalignment and "C" type misalignment in the prior art. The reduction in the misalignment amount of the tabs 2121 is equal to half of the difference between the width of the innermost tab 2121 and the width of the middle tab 2121.

[0048] In summary, among the various types of electrode tab misalignment, the misalignment amount of the electrode tab 2121 after the first electrode sheet 21 is wound and the overall width of the electrode tab 2121 provided in this embodiment are both smaller than those of the prior art. That is to say, the first electrode sheet 21 in this embodiment can effectively improve the misalignment of the electrode tab 2121.

[0049] This embodiment also provides an electrical device, which includes the battery described above, and the battery is used to provide electrical energy.

[0050] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery, characterized in that, The electrode assembly (2) includes a first electrode (21) having a first direction (X), a second direction (Y) and a third direction (Z) that are perpendicular to each other. The first electrode (21) includes a first electrode body (211) and a plurality of tabs (212). The electrode assembly (212) includes at least one electrode (2121), each electrode (2121) is disposed at one end of the first electrode body (211) along the third direction (Z), and is stacked along the second direction (Y); All the tabs (2121) within the same tab group (212) have the same width along the first direction (X); The first electrode body (211) is wound up, with the starting end of the winding of the first electrode body (211) being the first end (2111) and the ending end of the winding being the second end (2112). Each of the electrode tab groups (212) is arranged sequentially along the direction from the first end (2111) to the second end (2112). From the first end (2111) to the second end (2112), the width of the tab (2121) of each of the electrode tab groups (212) first decreases and then increases, and the width of the tab (2121) of the first electrode tab group (212) starting from the first end (2111) is greater than the width of the tab (2121) of the last electrode tab group (212).

2. The battery according to claim 1, characterized in that, From the first end (2111) to the second end (2112), the width of the tabs (2121) of each tab group (212) first decreases linearly and then increases linearly, or first decreases exponentially and then increases exponentially.

3. The battery according to claim 1 or 2, characterized in that, When the electrode group (212) includes multiple electrodes (2121), all electrodes (2121) in the electrode group (212) have the same height along the third direction (Z); From the first end (2111) to the second end (2112), the height of the tabs (2121) of each tab group (212) decreases.

4. The battery according to claim 3, characterized in that, From the first end (2111) to the second end (2112), the height of the tabs (2121) of each tab group (212) decreases linearly or exponentially.

5. The battery according to claim 3, characterized in that, The first electrode (21) is wound into N turns, with at least one electrode tab (2121) provided in each turn.

6. The battery according to claim 5, characterized in that, The number of electrodes (2121) in each electrode group (212) is equal and not less than two.

7. The battery according to claim 6, characterized in that, The first electrode (21) is provided with one electrode tab (2121) per turn, and the number of electrode tabs (2121) in each electrode tab group (212) is two.

8. The battery according to claim 3, characterized in that, For the same tab (2121), the width of the tab (2121) gradually decreases from the end of the tab (2121) that is close to the first electrode body (211) to the end of the tab (2121) that is away from the first electrode body (211).

9. The battery according to claim 1, characterized in that, The electrode assembly (2) includes a positive electrode (22), a negative electrode (23) and a separator (24). The separator (24) is sandwiched between the positive electrode (22) and the negative electrode (23). The positive electrode (22), the negative electrode (23) and the separator (24) are wound to form the electrode assembly (2). The positive electrode (22) and / or the negative electrode (23) is the first electrode (21).

10. An electrical appliance, characterized in that, It includes the battery according to any one of claims 1-9, the battery being used to provide electrical energy.

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