Multi-tab battery cell and battery

Abstract

The utility model discloses a multi-tab battery cell and discloses a battery with the multi-tab battery cell, the multi-tab battery cell comprises a battery cell main body, a first connecting piece and a second connecting piece, the battery cell main body is provided with a plurality of positive tabs and a plurality of negative tabs, and the positive tabs and the negative tabs are arranged at intervals along the thickness direction of the battery cell main body; at least one of the plurality of positive tabs is longer than the other positive tabs, at least one of the plurality of negative tabs is longer than the other negative tabs, the first connecting piece is arranged between two adjacent positive tabs, and the second connecting piece is arranged between two adjacent negative tabs. The positive tabs and the negative tabs do not need to be bent, the long positive tabs and the long negative tabs can extend out of the packaging bag in a straight-out mode, the packaging bag does not need to reserve a space for bending the positive tabs or the negative tabs, and the unit volume capacity of the battery can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a multi-tab battery core and a battery. Background Art

[0002] People have put forward higher requirements for the energy density, rate discharge and discharge temperature rise of lithium-ion batteries. The thickness of the battery has increased accordingly, and the length of the positive and negative electrodes of the battery has increased. If a single-pole tab form is used, the internal resistance of the battery will be very large, and the battery will be severely polarized during discharge, affecting the battery's service life and safety performance. Therefore, the application of multi-pole tab batteries is becoming more and more extensive.

[0003] Traditional multi-tab battery cells are packaged in packaging bags. The interior of the packaging bag includes a tab area that accommodates the tabs and a non-tab area that accommodates the battery cell body. Because the tab area needs to reserve the thickness of the folded tabs, a large space needs to be reserved in the tab area. Otherwise, the tabs will rebound and abut against the packaging bag, causing the tab area of ​​the packaging bag to be severely deformed. The non-tab area is not fully utilized and lacks support, resulting in a decrease in the unit volume capacity of the battery. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a multi-tab battery cell that can increase the unit volume capacity of the battery.

[0005] The utility model also provides a battery having the multi-tab battery core.

[0006] The multi-electrode battery cell according to the first embodiment of the present invention includes:

[0007] A battery cell body is provided with a plurality of positive tabs and a plurality of negative tabs, wherein the plurality of positive tabs and the plurality of negative tabs are spaced apart along the thickness direction of the battery cell body, at least one of the plurality of positive tabs is longer than the lengths of the remaining positive tabs, and at least one of the plurality of negative tabs is longer than the lengths of the remaining negative tabs;

[0008] A first connecting member is provided between two adjacent positive electrode tabs;

[0009] The second connecting piece is arranged between two adjacent negative electrode tabs.

[0010] The multi-electrode battery cell according to the first embodiment of the present invention has at least the following

[0011] Beneficial effects:

[0012] When packaging the battery, there is no need to bend multiple positive and negative ears. The longer positive and negative ears can be extended straight out of the packaging bag. The packaging bag does not need to reserve space for bending the positive or negative ears, which can increase the unit volume capacity of the battery.

[0013] According to some embodiments of the present invention, the plurality of positive tabs and the plurality of negative tabs are located on the same side of the battery cell body.

[0014] According to some embodiments of the present invention, along the length direction of the battery cell body, the plurality of positive tabs are located on one side of the battery cell body, and the plurality of negative tabs are located on the other opposite side of the battery cell body.

[0015] According to some embodiments of the present invention, the plurality of positive tabs include a first positive tab, a second positive tab, and a third positive tab that are sequentially spaced apart along the thickness direction of the battery cell body, two first connectors are correspondingly configured, and along the width direction of the battery cell body, the second positive tab is staggered with the first positive tab, the first positive tab is connected to the second positive tab via one of the first connectors, and the second positive tab is connected to the third positive tab via another of the first connectors; or

[0016] The multiple negative electrode ears include a first negative electrode ear, a second negative electrode ear and a third negative electrode ear that are arranged in sequence along the thickness direction of the battery cell body. Two second connecting members are correspondingly configured. Along the width direction of the battery cell body, the second negative electrode ears are staggered with the first negative electrode ears. The first negative electrode ear is connected to the second negative electrode ear through one of the second connecting members, and the second negative electrode ear is connected to the third negative electrode ear through another second connecting member.

[0017] According to some embodiments of the present invention, the lengths of the first positive electrode tab and the second positive electrode tab are equal, and the length of the third positive electrode tab is greater than the length of the first positive electrode tab; or,

[0018] The first negative electrode tab and the second negative electrode tab have the same length, and the third negative electrode tab has a length greater than that of the first negative electrode tab.

[0019] According to some embodiments of the present invention, along the thickness direction of the battery cell body, the projection of the first positive tab does not overlap with the projection of the second positive tab, or the projection of the first negative tab does not overlap with the projection of the second negative tab.

[0020] According to some embodiments of the present invention, the width of the first connecting member and / or the second connecting member is less than or equal to 1 mm.

[0021] According to some embodiments of the present invention, in two adjacent positive electrode tabs, both ends of the first connector are respectively connected to one side of the corresponding positive electrode tab in the thickness direction; or,

[0022] In two adjacent negative electrode tabs, both ends of the second connector are respectively connected to one side in the thickness direction of the corresponding negative electrode tab.

[0023] According to some embodiments of the present invention, both ends of the first connector are respectively welded to the corresponding positive tabs; or,

[0024] Both ends of the second connecting member are respectively welded to the corresponding negative electrode tabs.

[0025] A battery according to an embodiment of the second aspect of the present invention includes a packaging bag and the multi-pole battery cell described in the above embodiment, wherein the multi-pole battery cell is accommodated in the packaging bag.

[0026] The battery according to the second embodiment of the present invention has at least the following beneficial effects:

[0027] When packaging the battery, there is no need to bend multiple positive and negative ears. The longer positive and negative ears can be extended straight out of the packaging bag. The packaging bag does not need to reserve space for bending the positive or negative ears, which can increase the unit volume capacity of the battery.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1 This is a front view of a multi-electrode battery cell according to an embodiment of the present utility model;

[0031] Figure 2 for Figure 1 Right view;

[0032] Figure 3 for Figure 1 3D schematic diagram of

[0033] Figure 4 This is a front view of another embodiment of a multi-electrode battery cell according to an embodiment of the present utility model;

[0034] Figure 5 for Figure 4 Right view;

[0035] Figure 6 for Figure 4 Left view of;

[0036] Figure 7 for Figure 4 3D schematic diagram of .

[0037] Reference numerals:

[0038] The battery cell body 100 , the first positive tab 110 , the second positive tab 120 , the third positive tab 130 , the first negative tab 140 , the second negative tab 150 , the sixth negative tab 160 , the first connector 200 , and the second connector 300 . DETAILED DESCRIPTION

[0039] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0040] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0041] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0042] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0043] Reference Figure 1 、 Figure 4According to an embodiment of the first aspect of the present invention, a multi-electrode battery cell includes a battery cell body 100, a first connector 200, and a second connector 300. The battery cell body 100 is provided with a plurality of positive tabs and a plurality of negative tabs. The plurality of positive tabs and the plurality of negative tabs are spaced apart along the thickness direction of the battery cell body 100. The length of one of the plurality of positive tabs is greater than the length of the remaining positive tabs, and the length of one of the plurality of negative tabs is greater than the length of the remaining negative tabs. The first connector 200 is arranged between two adjacent positive tabs, and the second connector 300 is arranged between two adjacent negative tabs. In this way, by providing the first connector 200 and the second connector 300, the plurality of positive tabs and the plurality of negative tabs do not need to be bent. The longer positive tabs and negative tabs can extend straight out of the packaging bag. The packaging bag does not need to reserve space for bending the positive tabs or negative tabs, which can increase the unit volume capacity of the battery.

[0044] Specifically, two adjacent positive ears with shorter lengths are connected by corresponding first connectors 200, and a positive ear with longer length is connected to a corresponding positive ear with shorter length and angle by another corresponding first connector 200. Similarly, two adjacent negative ears with shorter lengths are connected by corresponding first connectors 200, and a negative ear with longer length is connected to a corresponding negative ear with shorter length and angle by another corresponding first connector 200. When packaging the battery, there is no need to bend multiple positive ears and multiple negative ears. The positive ears and negative ears with longer lengths can extend straight out of the packaging bag. The packaging bag does not need to reserve space for bending the positive ears or negative ears, which can increase the unit volume capacity of the battery.

[0045] It should be noted that when there are at least two positive electrode ears with a longer length, the positive electrode ears with a longer length can be gathered together and then extended out of one side of the packaging bag. Similarly, when there are at least two negative electrode ears with a longer length, the negative electrode ears with a longer length can be gathered together and then extended out of the other side of the packaging bag. This will not be repeated here.

[0046] It should be pointed out that, referring to Figure 2 When the battery cell body 100 is a wound battery cell, multiple positive tabs and multiple negative tabs are arranged on the same side of the battery cell body 100, and multiple positive tabs and multiple negative tabs are arranged at intervals along the width direction of the battery cell body 100 to avoid short circuit between the positive tabs and the negative tabs, thereby improving the reliability of the battery.

[0047] It should be noted that when the battery cell body 100 is a laminated battery cell, the multiple positive tabs and the multiple negative tabs are all arranged on the same side of the battery cell body 100, or the multiple positive tabs and the multiple negative tabs are respectively arranged on both sides of the length direction of the battery cell body 100;

[0048] When multiple positive tabs and multiple negative tabs are arranged on the same side of the battery cell body 100, the multiple positive tabs and multiple negative tabs are spaced apart along the width direction of the battery cell body 100 to avoid short circuit between the positive tabs and the negative tabs, thereby improving the reliability of the battery.

[0049] It should be noted that the specific structure of the wound battery cell or the laminated battery cell may be a well-known technology and will not be described in detail here.

[0050] Reference Figure 2 、 Figure 5 and Figure 7 In some embodiments of the present invention, the plurality of positive tabs include a first positive tab 110, a second positive tab 120, and a third positive tab 130, which are sequentially spaced apart along the thickness direction of the battery cell body 100. Two first connectors 200 are correspondingly provided. Along the width direction of the battery cell body 100, the second positive tab 120 and the first positive tab 110 are staggered. The first positive tab 110 is connected to the second positive tab 120 through one of the first connectors 200, and the second positive tab 120 is connected to the third positive tab 130 through the other first connector 200. This increases the distance between the second positive tab 120 and the first and third positive tabs 110, 130, thereby avoiding the concentration of heat generated by the first, second, and third positive tabs 110, 120, and 130, thereby improving the heat dissipation effect of the first, second, and third positive tabs 110, 120, and 130, thereby improving the heat dissipation effect of the battery.

[0051] Specifically, among the two first connectors 200, the two ends of one of the first connectors 200 are respectively connected to the first positive electrode ear 110 and the second positive electrode ear 120, and the two ends of the other first connector 200 are respectively connected to the second positive electrode ear 120 and the third positive electrode ear 130. Since the second positive electrode ear 120 and the first positive electrode ear 110 are staggered in the width direction of the battery cell body 100, the distance between the second positive electrode ear 120 and the first positive electrode ear 110 and the third positive electrode ear 130 is increased, which can avoid the concentration of heat generated by the first positive electrode ear 110, the second positive electrode ear 120 and the third positive electrode ear 130, thereby improving the heat dissipation effect of the first positive electrode ear 110, the second positive electrode ear 120 and the third positive electrode ear 130, thereby improving the heat dissipation effect of the battery.

[0052] It should be noted that, along the thickness direction of the battery cell body 100 , the multiple positive tabs may further include a fourth positive tab, a fifth positive tab, or a sixth positive tab, and the multiple negative tabs may further include a fourth negative tab, a fifth negative tab, or a sixth negative tab 160 , etc., without limitation herein.

[0053] In some embodiments of the present invention, the length of the first positive electrode tab 110 is equal to the length of the second positive electrode tab 120, and the length of the third positive electrode tab 130 is greater than the length of the first positive electrode tab 110. On the one hand, it is convenient to lead the third positive electrode tab 130 out of the packaging bag. On the other hand, it can reduce the space occupied by the first positive electrode tab 110 and the second positive electrode tab 120 in the packaging bag, thereby improving the unit volume capacity of the battery.

[0054] In some embodiments of the present invention, along the thickness direction of the battery cell body 100, the projection of the first positive tab 110 and the projection of the second positive tab 120 do not overlap, so that the distance between the second positive tab 120 and the first positive tab 110 is increased, which can avoid the concentration of heat generated by the first positive tab 110 and the second positive tab 120, thereby improving the heat dissipation effect of the first positive tab 110 and the second positive tab 120, thereby improving the heat dissipation effect of the battery.

[0055] In some embodiments of the present invention, along the thickness direction of the battery cell body 100, the projection of the first positive tab 110 and the projection of the third positive tab 130 completely overlap, so that the first positive tab 110 and the third positive tab 130 are arranged neatly, which can simplify the arrangement of the first connector 200 and facilitate the connection of the first connector 200 between adjacent positive tabs.

[0056] Of course, in other specific embodiments, the projection of the first positive tab 110 and the projection of the third positive tab 130 may also partially overlap, which can increase the distance between the first positive tab 110 and the third positive tab 130 to improve the heat dissipation effect of the first positive tab 110 and the third positive tab 130, which will not be repeated here.

[0057] In some embodiments of the present invention, the width of the first connecting member 200 is less than or equal to 1 mm, which can reduce the space occupied by the first connecting member 200 in the packaging bag and improve the unit volume capacity of the battery.

[0058] It should be noted that the width of the first connector 200 refers to the size of the first connector 200 in the length direction of the battery cell body 100 .

[0059] Reference Figure 2 、 Figure 6 and Figure 7In some embodiments of the present invention, the plurality of negative electrode tabs include a first negative electrode tab 140, a second negative electrode tab 150, and a third negative electrode tab that are sequentially spaced apart along the thickness direction of the battery cell body 100. Two second connectors 300 are correspondingly provided. Along the width direction of the battery cell body 100, the second negative electrode tab 150 and the first negative electrode tab 140 are staggered. The first negative electrode tab 140 is connected to the second negative electrode tab 150 through one of the second connectors 300, and the second negative electrode tab 150 is connected to the third negative electrode tab through the other second connector 300. This increases the distance between the second negative electrode tab 150 and the first and third negative electrode tabs, thereby preventing heat concentration among the first, second, and third negative electrode tabs, thereby improving the heat dissipation effect of the first, second, and third negative electrode tabs, and thereby improving the heat dissipation effect of the battery.

[0060] Specifically, among the two second connectors 300, the two ends of one second connector 300 are respectively connected to the first negative electrode tab 140 and the second negative electrode tab 150, and the two ends of the other second connector 300 are respectively connected to the second negative electrode tab 150 and the third negative electrode tab. Since the second negative electrode tab 150 and the first negative electrode tab 140 are staggered in the width direction of the battery cell body 100, the distance between the second negative electrode tab 150 and the first negative electrode tab 140 and the third negative electrode tab is increased, which can avoid the concentration of heat generated by the first negative electrode tab 140, the second negative electrode tab 150 and the third negative electrode tab, thereby improving the heat dissipation effect of the first negative electrode tab 140, the second negative electrode tab 150 and the third negative electrode tab, thereby improving the heat dissipation effect of the battery.

[0061] In some embodiments of the present invention, the length of the first negative electrode tab 140 is equal to the length of the second negative electrode tab 150, and the length of the third negative electrode tab is greater than the length of the first negative electrode tab 140. On the one hand, it is convenient to lead the third negative electrode tab out of the packaging bag, and on the other hand, it can reduce the space occupied by the first negative electrode tab 140 and the second negative electrode tab 150 in the packaging bag, thereby improving the unit volume capacity of the battery.

[0062] In some embodiments of the present invention, the projection of the first negative electrode tab 140 and the projection of the second negative electrode tab 150 do not overlap, so that the distance between the second negative electrode tab 150 and the first negative electrode tab 140 is increased, which can avoid the concentration of heat generated by the first negative electrode tab 140 and the second negative electrode tab 150, thereby improving the heat dissipation effect of the first negative electrode tab 140 and the second negative electrode tab 150, thereby improving the heat dissipation effect of the battery.

[0063] In some embodiments of the present invention, the projection of the first negative electrode tab 140 completely overlaps with the projection of the third negative electrode tab, so that the first negative electrode tab 140 and the third negative electrode tab are arranged neatly, which can simplify the arrangement of the second connector 300 and facilitate the connection of the second connector 300 between adjacent negative electrode tabs.

[0064] Of course, in other specific embodiments, the projection of the first negative electrode tab 140 and the projection of the third negative electrode tab may also partially overlap, which can increase the distance between the first negative electrode tab 140 and the third negative electrode tab to improve the heat dissipation effect of the first negative electrode tab 140 and the third negative electrode tab, which will not be repeated here.

[0065] It should be noted that the width of the second connecting member 300 is less than or equal to 1 mm, which can reduce the space occupied by the first connecting member 200 in the packaging bag, thereby increasing the unit volume capacity of the battery.

[0066] It should be noted that the width of the second connector 300 refers to the size of the second connector 300 in the length direction of the battery cell body 100 .

[0067] In some embodiments of the present invention, in two adjacent positive electrode tabs, both ends of the first connector 200 are respectively connected to one side of the corresponding positive electrode tab in the thickness direction, which can increase the connection area between the first connector 200 and the corresponding positive electrode tab, thereby improving the connection reliability of the first connector 200.

[0068] In some embodiments of the present invention, in two adjacent negative electrode tabs, both ends of the second connector 300 are respectively connected to one side of the corresponding negative electrode tab in the thickness direction, which can increase the connection area between the second connector 300 and the corresponding negative electrode tab, thereby improving the connection reliability of the second connector 300.

[0069] In some embodiments of the present invention, both ends of the first connector 200 are welded to the corresponding positive tabs, which is simple, convenient, and fast to fix the first connector 200. The welding method includes but is not limited to resistance welding, laser welding, or ultrasonic welding.

[0070] In some embodiments of the present invention, both ends of the second connector 300 are welded to the corresponding negative electrode tabs, which is simple, convenient, and quick to operate and can facilitate fixing the first connector 200. The welding method includes but is not limited to resistance welding, laser welding, or ultrasonic welding.

[0071] According to the battery of the embodiment of the second aspect of the present invention, it includes a packaging bag and a multi-pole tab battery cell of the embodiment of the first aspect of the present invention. The multi-pole tab battery cell is accommodated in the packaging bag. By providing a first connector 200 and a second connector 300, multiple positive tabs and multiple negative tabs do not need to be bent. Positive tabs and negative tabs with longer lengths can extend straight out of the packaging bag. The packaging bag does not need to reserve space for bending the positive tabs or negative tabs, which can increase the unit volume capacity of the battery.

[0072] Specifically, two adjacent positive ears with shorter lengths are connected by corresponding first connectors 200, and a positive ear with longer length is connected to a corresponding positive ear with shorter length and angle by another corresponding first connector 200. Similarly, two adjacent negative ears with shorter lengths are connected by corresponding first connectors 200, and a negative ear with longer length is connected to a corresponding negative ear with shorter length and angle by another corresponding first connector 200. When packaging the battery, there is no need to bend multiple positive ears and multiple negative ears. The positive ears and negative ears with longer lengths can extend straight out of the packaging bag. The packaging bag does not need to reserve space for bending the positive ears or negative ears, which can increase the unit volume capacity of the battery.

[0073] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiment is described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiment. Various changes can be made within the knowledge of ordinary technicians in the technical field without departing from the present invention.

Claims

1. A multi-electrode battery cell, characterized in that: include: A battery cell body (100) is provided with a plurality of positive tabs and a plurality of negative tabs, wherein the plurality of positive tabs and the plurality of negative tabs are spaced apart along the thickness direction of the battery cell body (100), the length of at least one of the plurality of positive tabs is greater than the lengths of the remaining positive tabs, and the length of at least one of the plurality of negative tabs is greater than the lengths of the remaining negative tabs; A first connecting member (200) is provided between two adjacent positive electrode tabs; The second connecting member (300) is arranged between two adjacent negative electrode tabs.

2. The multi-electrode battery cell according to claim 1, characterized in that: The plurality of positive electrode tabs and the plurality of negative electrode tabs are located on the same side of the battery cell body (100).

3. The multi-electrode battery cell according to claim 1, characterized in that: Along the length direction of the battery cell body (100), the plurality of positive electrode tabs are located on one side of the battery cell body, and the plurality of negative electrode tabs are located on the other side opposite to the battery cell body.

4. The multi-electrode battery cell according to any one of claims 1 to 3, characterized in that: The plurality of positive electrode tabs include a first positive electrode tab (110), a second positive electrode tab (120), and a third positive electrode tab (130) that are sequentially spaced apart along the thickness direction of the battery cell body (100); two first connectors (200) are correspondingly provided; along the width direction of the battery cell body (100), the second positive electrode tab (120) and the first positive electrode tab (110) are staggered; the first positive electrode tab (110) is connected to the second positive electrode tab (120) via one of the first connectors (200); and the second positive electrode tab (120) is connected to the third positive electrode tab (130) via another of the first connectors (200); or, The plurality of negative electrode tabs include a first negative electrode tab (140), a second negative electrode tab (150), and a third negative electrode tab that are sequentially spaced apart along the thickness direction of the battery cell body (100); two second connectors (300) are correspondingly provided; along the width direction of the battery cell body (100), the second negative electrode tab (150) and the first negative electrode tab (140) are staggered; the first negative electrode tab (140) is connected to the second negative electrode tab (150) through one of the second connectors (300); and the second negative electrode tab (150) is connected to the third negative electrode tab through another of the second connectors (300).

5. The multi-electrode battery cell according to claim 4, characterized in that: The lengths of the first positive electrode tab (110) and the second positive electrode tab (120) are equal, and the length of the third positive electrode tab (130) is greater than the length of the first positive electrode tab (110); or, The first negative electrode tab (140) and the second negative electrode tab (150) are equal in length, and the third negative electrode tab is longer than the first negative electrode tab (140).

6. The multi-electrode battery cell according to claim 4, characterized in that: Along the thickness direction of the battery cell body (100), the projection of the first positive electrode tab (110) does not overlap with the projection of the second positive electrode tab (120), or the projection of the first negative electrode tab (140) does not overlap with the projection of the second negative electrode tab (150).

7. The multi-electrode battery cell according to claim 1, characterized in that: The width of the first connecting member (200) and / or the second connecting member (300) is less than or equal to 1 mm.

8. The multi-electrode battery cell according to claim 1, characterized in that: In two adjacent positive electrode tabs, both ends of the first connector (200) are respectively connected to one side of the corresponding positive electrode tab in the thickness direction; or, In two adjacent negative electrode tabs, both ends of the second connector (300) are respectively connected to one side of the corresponding negative electrode tab in the thickness direction.

9. The multi-electrode battery cell according to claim 1, characterized in that: Both ends of the first connecting member (200) are respectively welded to the corresponding positive electrode tabs; or, Both ends of the second connecting member (300) are respectively welded to the corresponding negative electrode tabs.

10. A battery, characterized in that: It comprises a packaging bag and the multi-pole battery cell according to any one of claims 1 to 9, wherein the multi-pole battery cell is accommodated in the packaging bag.

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