Battery cell, battery and method of assembling a battery

Abstract

The application relates to the technical field of batteries, and discloses a battery cell unit, a battery and a battery assembling method. The battery cell unit is arranged in a battery shell, and comprises a first battery cell and a second battery cell which are stacked, so that the thickness of the battery cell unit can be increased to meet the capacity requirement of the battery cell unit. By arranging a first positive electrode tab of the first battery cell and a second negative electrode tab of the second battery cell on the same side and arranging a first negative electrode tab of the first battery cell and a second positive electrode tab of the second battery cell on the same side, the first battery cell and the second battery cell are connected in series, and two electrode lead-out ends of the battery cell unit are led out from the same side, so that the space utilization rate of the formed battery is improved. The first positive electrode tab and the second negative electrode tab can be arranged in sequence in the height space, so that the first positive electrode tab and the second negative electrode tab are full tabs, and the overcurrent capacity of the tabs is improved, so that the safety performance of the battery cell unit is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery cell unit, a battery and a battery assembling method. BACKGROUND

[0002] In the related art, a battery includes a battery shell and a battery cell installed in the battery shell. Due to the limitation of the forming process of the battery cell itself, it is difficult to form a battery cell with a large thickness, and thus it is difficult to form a battery with a large capacity requirement. SUMMARY

[0003] The present application provides a battery cell unit, a battery and a battery assembling method to improve the performance of the battery cell unit.

[0004] According to a first aspect of the present application, a battery cell unit is provided for being arranged in a battery shell, the battery cell unit comprising:

[0005] a first battery cell, the first battery cell comprising a first battery cell body, a first positive electrode tab and a first negative electrode tab, the first positive electrode tab and the first negative electrode tab extending from opposite ends of the first battery cell body along a first direction and a second direction respectively;

[0006] a second battery cell, the second battery cell being stacked with the first battery cell, the stacking direction of the second battery cell and the first battery cell being perpendicular to the extension direction of the first positive electrode tab after being flattened, the second battery cell comprising a second battery cell body, a second positive electrode tab and a second negative electrode tab, the second positive electrode tab and the second negative electrode tab extending from opposite ends of the second battery cell body along the second direction and the first direction respectively.

[0007] The battery cell unit of the present application comprises a first battery cell and a second battery cell stacked together, so as to increase the thickness of the battery cell unit, thereby meeting the capacity requirement of the battery cell unit, and reducing the forming difficulty of the battery cell for a battery cell unit with a large capacity requirement, thereby improving the performance of the battery cell unit. By arranging the first positive electrode tab of the first battery cell and the second negative electrode tab of the second battery cell on the same side, and arranging the first negative electrode tab of the first battery cell and the second positive electrode tab of the second battery cell on the same side, the first battery cell and the second battery cell can be connected in series, and the two electrode lead-out ends of the battery cell unit can be led out from the same side, so as to improve the space utilization rate of the formed battery, and the first positive electrode tab and the second negative electrode tab can be arranged in height space in sequence, so as to avoid overlapping, and thus the first positive electrode tab and the second negative electrode tab can be full tabs, thereby improving the overcurrent capacity of the tabs, and improving the safety performance of the battery cell unit.

[0008] According to a second aspect of the present application, a battery is provided, comprising the above-mentioned battery cell unit and a battery shell, the battery cell unit being arranged in the battery shell.

[0009] The battery of the embodiment of the present application comprises a battery shell and a cell unit arranged in the battery shell. The cell unit comprises a first cell and a second cell stacked together, so that the thickness of the cell unit can be increased to meet the capacity requirement of the cell unit, and the forming difficulty of the cell can be reduced for the cell unit with high capacity requirement, so that the performance of the cell unit is improved. By arranging the first positive electrode tab of the first cell and the second negative electrode tab of the second cell on the same side, and arranging the first negative electrode tab of the first cell and the second positive electrode tab of the second cell on the same side, the first cell and the second cell can be connected in series, and the two electrode lead-out ends of the cell unit can be led out from the same side to improve the space utilization of the battery. The first positive electrode tab and the second negative electrode tab can be arranged in the height space in sequence, so that the first positive electrode tab and the second negative electrode tab are full tabs, so that the overcurrent capacity of the tabs is improved to improve the safety performance of the battery.

[0010] According to a third aspect of the present application, a battery assembly method is provided, comprising:

[0011] connecting the first positive electrode tab of the first cell with the third positive electrode tab of the third cell;

[0012] connecting the second negative electrode tab of the second cell with the fourth negative electrode tab of the fourth cell;

[0013] connecting the first negative electrode tab of the first cell with the second positive electrode tab of the second cell;

[0014] connecting the third negative electrode tab of the third cell with the fourth positive electrode tab of the fourth cell;

[0015] enclosing the cell unit formed by the first cell, the second cell, the third cell and the fourth cell in the battery shell.

[0016] The battery assembly method of the embodiment of the present application connects the first cell, the second cell, the third cell and the fourth cell, and stacks the first cell and the second cell, and stacks the third cell and the fourth cell, so that the battery has sufficient capacity to meet the use requirement. The two electrode lead-out ends of the cell unit enclosed in the battery shell are led out from the same side to improve the space utilization after the battery is formed, so that the assembly performance of the battery is improved.

[0017] According to a fourth aspect of the present application, a battery assembly method is provided, comprising:

[0018] connecting the first negative electrode tab of the first cell with the second positive electrode tab of the second cell;

[0019] connecting the first positive electrode tab of the first battery cell to the pole assembly of the first housing member, or connecting the second negative electrode tab of the second battery cell to the pole assembly of the first housing member;

[0020] connecting the second housing member to the first housing member to enclose the first battery cell and the second battery cell in the battery housing.

[0021] The assembling method of the battery according to the embodiments of the present application can ensure that the battery has sufficient capacity to meet the use requirements by connecting the first battery cell and the second battery cell. The two electrode lead-out ends of the battery cell units enclosed in the battery housing are led out from the same side to improve the space utilization after the battery is formed, thereby improving the assembling performance of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0022] For a better understanding of the present disclosure, reference can be made to the embodiments illustrated in the accompanying drawings. The components in the drawings are not necessarily to scale, and related elements can be omitted in order to emphasize and clarify the technical features of the present disclosure. In addition, related elements or components can have different settings as known in the art. Furthermore, in the drawings, the same reference numerals represent the same or similar components throughout the various drawings. Among them:

[0023] Figure 1 is a structural schematic diagram of a battery cell unit according to an exemplary embodiment;

[0024] Figure 2 is a structural schematic diagram of a battery according to a first exemplary embodiment;

[0025] Figure 3 is an exploded structural schematic diagram of a battery according to a first exemplary embodiment;

[0026] Figure 4 is a cross-sectional structural schematic diagram of a battery according to a first exemplary embodiment;

[0027] Figure 5 is a cross-sectional structural schematic diagram of a battery according to a second exemplary embodiment;

[0028] Figure 6 is a cross-sectional structural schematic diagram of a battery according to a third exemplary embodiment;

[0029] Figure 7 is a cross-sectional structural schematic diagram of a battery according to a fourth exemplary embodiment;

[0030] Figure 8 is a flowchart of an assembling method of a battery according to an exemplary embodiment;

[0031] Figure 9 is a flowchart of an assembling method of a battery according to another exemplary embodiment.

[0032] The reference signs are explained as follows:

[0033] 10, first battery cell; 11, first battery cell body; 12, first positive tab; 13, first negative tab; 20, second battery cell; 21, second battery cell body; 22, second positive tab; 23, second negative tab; 30, third battery cell; 31, third battery cell body; 32, third positive tab; 33, third negative tab; 40, fourth battery cell; 41, fourth battery cell body; 42, fourth positive tab; 43, fourth negative tab; 50, battery case; 51, recess; 511, protruding structure; 52, first surface; 53, second surface; 54, first case member; 55, second case member; 60, post assembly; 70, insulating support. DETAILED DESCRIPTION

[0034] The technical solutions in the example embodiments of the present disclosure will be described clearly and completely in combination with the accompanying drawings of the example embodiments of the present disclosure. The example embodiments described herein are only for illustrative purposes, and are not intended to limit the protection scope of the present disclosure, and therefore it should be understood that various modifications and changes can be made to the example embodiments without departing from the protection scope of the present disclosure.

[0035] In the description of the present disclosure, unless explicitly specified and limited, the terms “first”, “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance; the term “multiple” refers to two or more than two; the term “and / or” includes any combination and all combinations of one or more associated listed items. In particular, referring to “the” object or “one” object is also intended to represent one of the possible multiple such objects.

[0036] Unless otherwise specified or explained, the terms “connection”, “fixation” and the like should be understood broadly, for example, “connection” can be fixed connection, or detachable connection, or integrally connected, or electrically connected, or signal connected; “connection” can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0037] Further, in the description of the present disclosure, it needs to be understood that the orientation words such as "upper", "lower", "inner", "outer" and the like described in the example embodiments of the present disclosure are described in the angle shown in the drawings, and should not be understood as the limitation of the example embodiments of the present disclosure. It also needs to be understood that in the context, when referring to one element or feature connected to another element (one or more) "on", "under", or "inner", "outer", it can not only be directly connected to another element (one or more) "on", "under", or "inner", "outer", but also indirectly connected to another element (one or more) "on", "under", or "inner", "outer" through an intermediate element.

[0038] One embodiment of the present application provides an electric cell unit, please refer to Figure 1 The electric cell unit is arranged in a battery housing, and the electric cell unit comprises: a first electric cell 10, the first electric cell 10 comprises a first electric cell body 11, a first positive electrode tab 12 and a first negative electrode tab 13, the first positive electrode tab 12 and the first negative electrode tab 13 extend from opposite ends of the first electric cell body 11 along a first direction and a second direction respectively; a second electric cell 20, the second electric cell 20 is stacked with the first electric cell 10, the stacking direction of the second electric cell 20 and the first electric cell 10 is perpendicular to the extension direction of the first positive electrode tab 12 after being flattened, the second electric cell 20 comprises a second electric cell body 21, a second positive electrode tab 22 and a second negative electrode tab 23, the second positive electrode tab 22 and the second negative electrode tab 23 extend from opposite ends of the second electric cell body 21 along the second direction and the first direction respectively, and the first direction and the second direction are opposite directions.

[0039] The electric cell unit of one embodiment of the present application comprises the first electric cell 10 and the second electric cell 20 stacked with each other, so that the thickness of the electric cell unit can be increased to meet the capacity requirement of the electric cell unit, and the forming difficulty of the electric cell can be reduced for the electric cell unit with higher capacity requirement, so as to improve the performance of the electric cell unit. By arranging the first positive electrode tab 12 of the first electric cell 10 and the second negative electrode tab 23 of the second electric cell 20 on the same side, and arranging the first negative electrode tab 13 of the first electric cell 10 and the second positive electrode tab 22 of the second electric cell 20 on the same side, the first electric cell 10 and the second electric cell 20 can be connected in series, and the two electrode lead-out ends of the electric cell unit can be led out from the same side, so as to improve the space utilization rate after the battery is formed, and the first positive electrode tab 12 and the second negative electrode tab 23 can be arranged in the height space in sequence, so that they do not overlap, so that the first positive electrode tab 12 and the second negative electrode tab 23 can be full tabs, so as to improve the overcurrent capacity of the tabs, and improve the safety performance of the electric cell unit.

[0040] The electric core refers to a unit formed by winding or laminating a stacking part including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. The polarity of the first electrode and the second electrode can be interchanged.

[0041] It should be noted that the second electric core 20 is stacked with the first electric core 10, and the stacking direction of the second electric core 20 and the first electric core 10 is perpendicular to the extension direction of the first positive electrode tab 12 after being flattened, that is, the second electric core 20 and the first electric core 10 can form a structure stacked up and down, thereby increasing the overall thickness of the electric core unit. During the forming process of the independent first electric core 10 and the second electric core 20, the electric core with a large forming thickness can be avoided, which not only improves the forming efficiency, but also improves the precision after forming, thereby ensuring the use performance of the subsequent electric core unit. The first electric core 10 can include a first electrode, a separator, and a second electrode, and the extension direction of the first positive electrode tab 12 after being flattened can be considered as the extension direction of the first electrode. In one embodiment, the first positive electrode tab 12 of the first electric core 10 and the second negative electrode tab 23 of the second electric core 20 are located on the same side, the first negative electrode tab 13 of the first electric core 10 and the second positive electrode tab 22 of the second electric core 20 are located on the same side, and the projection of the first positive electrode tab 12 on the projection plane perpendicular to the stacking direction of the first electric core 10 and the second electric core 20 is the first positive projection, the projection of the second negative electrode tab 23 on the projection plane is the second positive projection, and at least part of the first positive projection and the second positive projection coincide, that is, the first positive electrode tab 12 of the first electric core 10 and the second negative electrode tab 23 of the second electric core 20 can directly face each other, so that in the subsequent process of forming the battery, the first negative electrode tab 13 of the first electric core 10 and the second positive electrode tab 22 of the second electric core 20 can be connected, and the first positive electrode tab 12 of the first electric core 10 and the second negative electrode tab 23 of the second electric core 20 can be used as two electrode leads. Since the first positive electrode tab 12 and the second negative electrode tab 23 are arranged opposite to each other, it is convenient for subsequent lead-out, and since the first positive electrode tab 12 and the second negative electrode tab 23 are arranged in an up-down manner, the first positive electrode tab 12 and the second negative electrode tab 23 can not be cut, thereby ensuring the overcurrent capacity of the first positive electrode tab 12 and the second negative electrode tab 23.

[0042] In one embodiment, in combination with Figure 1 As shown, the first negative electrode tab 13 and the second positive electrode tab 22 are connected, so that the first electric core 10 and the second electric core 20 can be connected in series, thereby facilitating the subsequent assembly of the battery and meeting the use requirements.

[0043] In the process of forming the battery, the first negative tab 13 and the second positive tab 22 are connected, and the first positive tab 12 and the second negative tab 23 can be connected with two pole assembly respectively, so that the two pole assemblies serve as electrode lead-out ends. Alternatively, the first positive tab 12 and the second negative tab 23 can be connected with the pole assembly and the battery shell respectively, so that the pole assembly and the battery shell serve as electrode lead-out ends. In some embodiments, it is not excluded that the first positive tab 12 and the second negative tab 23 can be connected with the first shell part and the second shell part of the battery shell respectively, and the first shell part and the second shell part are insulated from each other, so that the first shell part and the second shell part serve as electrode lead-out ends.

[0044] In one embodiment, the projection of the first negative tab 13 on the projection plane is a third orthographic projection, and the projection of the second positive tab 22 on the projection plane is a fourth orthographic projection. At least part of the third orthographic projection and the fourth orthographic projection overlap, so that the first negative tab 13 and the second positive tab 22 can be arranged opposite to each other. This not only facilitates the connection of the first negative tab 13 and the second positive tab 22, but also allows the reasonable arrangement of the first battery cell 10 and the second battery cell 20, so that the opposite ends of the first battery cell 10 and the opposite ends of the second battery cell 20 are substantially flush.

[0045] In some embodiments, it is not excluded that the third orthographic projection and the fourth orthographic projection do not overlap, and the first negative tab 13 and the second positive tab 22 can be electrically connected through other structures. In some embodiments, the projection of the first positive tab 12 on the projection plane perpendicular to the stacking direction of the first battery cell 10 and the second battery cell 20 is a first orthographic projection, and the projection of the second negative tab 23 on the projection plane is a second orthographic projection. The first orthographic projection and the second orthographic projection do not overlap.

[0046] In one embodiment, as shown in FIG. 1, the first battery cell 10 and the second battery cell 20 are arranged opposite to each other, and the first negative tab 13 and the second positive tab 22 are arranged opposite to each other. The first positive tab 12 and the second negative tab 23 are arranged on the same side of the first battery cell 10 and the second battery cell 20. Figure 1As shown, the battery cell unit further comprises: a third battery cell 30, the third battery cell 30 comprising a third battery cell body 31, a third positive electrode tab 32 and a third negative electrode tab 33, the third positive electrode tab 32 and the third negative electrode tab 33 extending from opposite ends of the third battery cell body 31 along the second direction and the first direction respectively; a fourth battery cell 40, the fourth battery cell 40 being stacked with the third battery cell 30, the stacking direction of the fourth battery cell 40 and the third battery cell 30 being perpendicular to the extending direction of the third positive electrode tab 32 after being flattened, the fourth battery cell 40 comprising a fourth battery cell body 41, a fourth positive electrode tab 42 and a fourth negative electrode tab 43, the fourth positive electrode tab 42 and the fourth negative electrode tab 43 extending from opposite ends of the fourth battery cell body 41 along the first direction and the second direction respectively; the first battery cell 10 and the third battery cell 30 being arranged along the first direction, the first positive electrode tab 12 being connected with the third positive electrode tab 32, the second battery cell 20 and the fourth battery cell 40 being arranged along the first direction, the second negative electrode tab 23 being connected with the fourth negative electrode tab 43, the third negative electrode tab 33 being connected with the fourth positive electrode tab 42.

[0047] The first battery cell 10, the second battery cell 20, the third battery cell 30 and the fourth battery cell 40 can form a battery cell unit, so that the length and the thickness of the battery cell unit are relatively large, thereby meeting the capacity requirement of the battery. Further, the first positive electrode tab 12 is connected with the third positive electrode tab 32, and the second negative electrode tab 23 is connected with the fourth negative electrode tab 43, so that the first positive electrode tab 12 and the third positive electrode tab 32 serve as one electrode lead-out end of the battery cell unit, and the second negative electrode tab 23 and the fourth negative electrode tab 43 serve as the other electrode lead-out end of the battery cell unit, so that the battery cell unit can be charged and discharged through the two electrode lead-out ends after being formed into a battery, and since the first positive electrode tab 12 is connected with the third positive electrode tab 32, and the second negative electrode tab 23 is connected with the fourth negative electrode tab 43, the first positive electrode tab 12 and the third positive electrode tab 32, and the second negative electrode tab 23 and the fourth negative electrode tab 43 can have sufficient overcurrent capacity on the basis of ensuring reliable connection of the first battery cell 10, the second battery cell 20, the third battery cell 30 and the fourth battery cell 40, thereby ensuring the use performance of the battery cell unit.

[0048] In combination Figure 1 As shown, the first battery cell 10 and the second battery cell 20 are stacked, and the third battery cell 30 and the fourth battery cell 40 are stacked, and the first battery cell 10 and the second battery cell 20 are connected in series through the first negative electrode tab 13 and the second positive electrode tab 22, and the third battery cell 30 and the fourth battery cell 40 are connected in series through the third negative electrode tab 33 and the fourth positive electrode tab 42, and the first positive electrode tab 12 is connected with the third positive electrode tab 32, and the second negative electrode tab 23 is connected with the fourth negative electrode tab 43, thereby forming a battery cell unit with large capacity.

[0049] It should be noted that the first electric core 10, the second electric core 20, the third electric core 30 and the fourth electric core 40 can be electric cores with the same structure, and in some embodiments, the first electric core 10, the second electric core 20, the third electric core 30 and the fourth electric core 40 can also be electric cores with different structures, which are not limited herein.

[0050] One embodiment of the present application also provides a battery, which is combined with Figures 1 to 7 As shown in the figure, the battery comprises the above-mentioned electric core unit and a battery shell 50, and the electric core unit is arranged in the battery shell 50.

[0051] The battery of one embodiment of the present application comprises an electric core unit and a battery shell 50, and the electric core unit is arranged in the battery shell 50. The electric core unit comprises the first electric core 10 and the second electric core 20 stacked together, so that the thickness of the electric core unit can be increased to meet the capacity requirement of the electric core unit, and the forming difficulty of the electric core can be reduced for the electric core unit with a larger capacity requirement, thereby improving the performance of the electric core unit. By arranging the first positive electrode tab 12 of the first electric core 10 and the second negative electrode tab 23 of the second electric core 20 on the same side, and arranging the first negative electrode tab 13 of the first electric core 10 and the second positive electrode tab 22 of the second electric core 20 on the same side, the first electric core 10 and the second electric core 20 can be connected in series, and the two electrode lead-out ends of the electric core unit can be led out from the same side to improve the space utilization of the battery, and the first positive electrode tab 12 and the second negative electrode tab 23 can be arranged in sequence in the height space, so that they do not overlap, and thus the first positive electrode tab 12 and the second negative electrode tab 23 can be full tabs, thereby improving the overcurrent capacity of the tabs to improve the safety performance of the battery.

[0052] In some embodiments, the first negative electrode tab 13 and the second positive electrode tab 22 are connected, so that the first electric core 10 and the second electric core 20 can be connected in series, thereby facilitating the subsequent assembly of the battery and meeting the use requirements.

[0053] In some embodiments, the first positive electrode tab 12 and the second negative electrode tab 23 can be led out from the battery shell 50 by two pole column assemblies respectively, and the first negative electrode tab 13 and the second positive electrode tab 22 can also be led out from the battery shell 50 by two pole column assemblies respectively, so that the first electric core 10 and the second electric core 20 can be two independent electric cores that can be charged and discharged.

[0054] In one embodiment, the first cell 10, the second cell 20, the third cell 30 and the fourth cell 40 can constitute a cell unit, at least one of the first positive tab 12, the first negative tab 13, the second positive tab 22, the second negative tab 23, the third positive tab 32, the third negative tab 33, the fourth positive tab 42 and the fourth negative tab 43 is a full tab, the arrangement of the full tab not only facilitates electrical connection, but also improves the overcurrent capacity, further, the cutting of the tab after the formation of the cell can be avoided, thereby improving the forming efficiency of the cell. The full tab can be considered as: the width of the tab perpendicular to the extension direction is equal to the width of the electrode perpendicular to the extension direction. For example, the first cell 10 can include a first electrode, a separator and a second electrode, the first electrode can be a positive electrode, and the first positive tab 12 is a full tab, i.e., the width of the first positive tab 12 can be equal to the width of the first electrode.

[0055] In some embodiments, the first positive tab 12, the first negative tab 13, the second positive tab 22, the second negative tab 23, the third positive tab 32, the third negative tab 33, the fourth positive tab 42 and the fourth negative tab 43 can be non-full tab structures, i.e., the width of the tab can be less than the width of the cell body.

[0056] It should be noted that, taking the first cell 10 as an example, the first cell 10 includes a first cell body 11, a first positive tab 12 and a first negative tab 13, the first positive tab 12 and the first negative tab 13 extend from opposite ends of the first cell body 11, if the first positive tab 12 and the first negative tab 13 are full tabs, the width of the first positive tab 12 is substantially consistent with the width of the first cell body 11, and the width of the first negative tab 13 is substantially consistent with the width of the first cell body 11, thereby indicating that the tab will not be cut. If the first positive tab 12 and the first negative tab 13 are non-full tabs, the width of the first positive tab 12 is less than the width of the first cell body 11, and the width of the first negative tab 13 is less than the width of the first cell body 11, thereby indicating that the tab will be cut.

[0057] In one embodiment, as shown in Figure 2 and Figure 3 The battery further includes a post assembly 60, the post assembly 60 is arranged in the battery housing 50, the post assembly 60 is connected to the first positive tab 12 or the second negative tab 23, so that the post assembly 60 can serve as one electrode lead-out end, and the other electrode lead-out end can be formed by the battery housing 50 or another post assembly 60.

[0058] In some embodiments, as shown in Figure 5 and Figure 7As shown, the pole assembly 60 can be two, and the two pole assemblies 60 are connected to the first positive tab 12 and the second negative tab 23 respectively, so that the two pole assemblies 60 can be used as two electrode leads of the battery respectively. The two pole assemblies 60 can be conveniently arranged on two sides of the battery case 50.

[0059] It should be noted that when at least part of the first positive projection and the second positive projection do not overlap, the two pole assemblies 60 can be arranged on the same side of the battery case 50.

[0060] In one embodiment, the battery case 50 includes a steel shell, the second negative tab 23 is electrically connected to the steel shell, and the first positive tab 12 is connected to the pole assembly 60, so that the battery case 50 and the pole assembly 60 can be used as two electrode leads of the battery respectively, not only simple structure, but also can reduce the weight of the battery. The steel shell has a high corrosion potential, so electrically connecting the second negative tab 23 to the steel shell can avoid a large amount of corrosion of the steel shell, further improving the safety performance of the battery.

[0061] In one embodiment, the battery case 50 includes an aluminum shell, the first positive tab 12 is electrically connected to the aluminum shell, and the second negative tab 23 is connected to the pole assembly 60, so that the battery case 50 and the pole assembly 60 can be used as two electrode leads of the battery respectively, not only simple structure, but also can reduce the weight of the battery. The aluminum shell has a low corrosion potential, so electrically connecting the first positive tab 12 to the aluminum shell can avoid a large amount of corrosion of the aluminum shell, further improving the safety performance of the battery.

[0062] Further, when the first positive tab 12 and the third positive tab 32 are connected to the pole assembly 60 of the battery case 50, the second negative tab 23 and the fourth negative tab 43 are electrically connected to the battery case 50, or when the second negative tab 23 and the fourth negative tab 43 are connected to the pole assembly 60 of the battery case 50, the first positive tab 12 and the third positive tab 32 are electrically connected to the battery case 50. The first positive tab 12 and the third positive tab 32 can be directly connected to the pole assembly 60, or the first positive tab 12 and the third positive tab 32 can be connected to the pole assembly 60 through an adapter structure. Correspondingly, the second negative tab 23 and the fourth negative tab 43 can be directly connected to the pole assembly 60, or the second negative tab 23 and the fourth negative tab 43 can be connected to the pole assembly 60 through an adapter structure.

[0063] In one embodiment, as Figure 2 and Figure 3As shown, the battery shell 50 is provided with a recess 51, which can be used to accommodate the pole assembly of another battery, so that when the batteries are grouped, the recess 51 gives way to the pole assembly of another battery, thereby avoiding collision of the pole assembly, thereby improving the space utilization rate when the batteries are grouped.

[0064] In one embodiment, as shown in Figure 4 The pole assembly 60 is located outside the range of the recess 51, that is, the pole assembly 60 is not provided in the recess 51, and the pole assembly 60 can protrude from the battery shell 50, as shown in Figures 2 to 4 At this time, when the batteries are grouped, the protruding pole assembly 60 can be accommodated in the recess of another battery.

[0065] In one embodiment, the recess 51 is provided on the side of the battery shell 50 away from the pole assembly 60, so that the recess 51 can reliably accommodate the pole assembly of another battery, and the subsequent connection between adjacent batteries can be facilitated, thereby improving the space utilization rate when the batteries are grouped.

[0066] In one embodiment, the projection of the recess 51 along the surface of the battery shell 50 where the pole assembly 60 is located at least partially overlaps the pole assembly 60, that is, the recess 51 and the pole assembly 60 at least partially overlap along the projection on one surface of the battery shell 50, so that when the batteries are grouped, the two batteries can be aligned with each other, and it can be ensured that the pole assembly of another battery can be reliably accommodated in the recess 51, while ensuring the consistency of battery processing, facilitating processing.

[0067] It should be noted that the specific structure of the recess 51 described above can not be limited, as long as it can accommodate the pole assembly of another battery.

[0068] In one embodiment, as shown in Figures 5 to 7 The battery shell 50 is provided with a recess 51, and the pole assembly 60 is located in the recess 51, so that the pole assembly 60 can be avoided or reduced to protrude from the battery shell 50, thereby avoiding the pole assembly between adjacent batteries affecting the space utilization rate of the battery pack.

[0069] As shown in Figure 5 The battery shell 50 is provided with a recess 51, one pole assembly 60 is located in the recess 51, and the other pole assembly 60 is located on the side of the battery shell 50 away from the recess 51.

[0070] As shown in Figure 6 The battery shell 50 is provided with a recess 51, and one pole assembly 60 is located in the recess 51.

[0071] As shown in Figure 7As shown in the figures, two recesses 51 are provided on the battery housing 50, one pole assembly 60 is located in one recess 51, and another pole assembly 60 is located in the other recess 51.

[0072] In one embodiment, the recess 51 is provided on the battery housing 50, and the recess 51 is used to connect with the battery box, so that when the battery is grouped, the battery housing 50 is connected to the battery box through the recess 51, thereby improving the installation stability of the battery.

[0073] It should be noted that when the cell unit is composed of the first cell 10 and the second cell 20, the recess 51 can be located at the end of the battery housing 50. When the cell unit is composed of the first cell 10, the second cell 20, the third cell 30, and the fourth cell 40, the recess 51 can be located in the middle of the battery housing 50, thereby achieving the different functions described above. The recess 51 for accommodating the pole assembly of another battery, the recess 51 for providing the pole assembly 60 of the battery, and the recess 51 for connecting with the battery box, the setting positions of the recesses and the specific structural forms can be inconsistent, and in some embodiments, the setting positions of the recesses and the specific structural forms can also be consistent, which is not limited here, as long as the use requirements are met.

[0074] In one embodiment, as shown in Figure 2 and Figure 3 The battery housing 50 includes a first housing member 54 and a second housing member 55 connected with the first housing member 54 to enclose the cell unit. The first housing member 54 and the second housing member 55 are independently provided, which can facilitate the installation of the cell unit and is also relatively convenient to process.

[0075] In some embodiments, the first housing member 54 and the second housing member 55 can each form a receiving cavity, and after the first housing member 54 and the second housing member 55 are butted, the cell unit is located in a cavity formed by the two receiving cavities.

[0076] In some embodiments, the second housing member 55 is a flat plate, the first housing member 54 forms a receiving cavity, and the cell unit is located in the receiving cavity. The provision of the flat plate can facilitate subsequent connection, and the processing difficulty is relatively low.

[0077] In combination with Figure 2 and Figure 3As shown, the first shell piece 54 can be formed with a receiving cavity, and the second shell piece 55 is a flat plate, the first shell piece 54 is provided with the pole assembly 60, and the second shell piece 55 is formed with the recess 51, so that a part of the second shell piece 55 can protrude towards the inside of the battery shell 50, and when the first positive tab 12 and the third positive tab 32 are connected to the pole assembly 60 of the battery shell 50, the first shell piece 54 can be connected to the second negative tab 23 and the fourth negative tab 43. Alternatively, when the second negative tab 23 and the fourth negative tab 43 are connected to the pole assembly 60 of the battery shell 50, the first shell piece 54 can be connected to the first positive tab 12 and the third positive tab 32.

[0078] In one embodiment, the recess 51 penetrates through opposite sides of the battery shell 50, which is not only simple in structure and convenient for molding, but also facilitates subsequent cooperation with other structures.

[0079] In combination Figure 3 As shown, the recess 51 can be used to accommodate the pole assembly of another battery, and at the same time the recess 51 is punched or bent, a protruding structure 511 is formed inside, so that the protruding structure 511 is electrically connected with the tab, so that the pole assembly 60 and the second shell piece 55 serve as two electrode lead-out ends of the battery.

[0080] In one embodiment, as Figure 2 As shown, the battery shell 50 includes two opposite first surfaces 52 and four second surfaces 53 arranged around the first surfaces 52, the area of the first surface 52 is larger than the area of the second surface 53; wherein the pole assembly 60 is arranged on the first surface 52, so as to ensure that the pole assembly 60 has a reliable supporting surface, thereby ensuring the stability of the pole assembly 60.

[0081] It should be noted that the two opposite first surfaces 52 are large surfaces of the battery shell 50, and the four second surfaces 53 are small surfaces of the battery shell 50, the four second surfaces 53 include two pairs of small surfaces, i.e. a first pair of small surfaces extending along the length direction of the battery shell 50, and a second pair of small surfaces extending along the width direction of the battery shell 50, and the area of the first pair of small surfaces is larger than the area of the second pair of small surfaces, but both are smaller than the area of the large surface.

[0082] In some embodiments, as Figure 2 As shown, the battery shell 50 is provided with the recess 51, which can be used to accommodate the pole assembly of another battery, at this time, one of the first surfaces 52 of the battery shell 50 can be provided with the pole assembly 60, and the other of the first surfaces 52 of the battery shell 50 can be provided with the recess 51.

[0083] In some embodiments, as shown in Figures 5 to 7 The battery shell 50 is provided with a recess 51, and the pole post assembly 60 is located in the recess 51, that is, the recess 51 and the pole post assembly 60 are provided on a first surface 52 of the battery shell 50.

[0084] In some embodiments, the battery shell 50 is provided with a recess 51 for connecting with the battery box, and the recess 51 can be provided on a second surface 53 of the battery shell 50. Of course, it is not excluded that the recess 51 can be provided on the first surface 52 of the battery shell 50.

[0085] In an embodiment, the pole post assembly 60 is arranged in the middle of the first surface 52, so that the pole post assembly 60 simultaneously connects the first positive tab 12 and the third positive tab 32, or the pole post assembly 60 simultaneously connects the second negative tab 23 and the fourth negative tab 43, so as to ensure that the pole post assembly 60 can serve as an electrode lead-out end of the battery cell unit.

[0086] The first battery cell 10, the second battery cell 20, the third battery cell 30 and the fourth battery cell 40 can form a battery cell unit, and the pole post assembly 60 can be two, one pole post assembly 60 simultaneously connects the first positive tab 12 and the third positive tab 32, and the other pole post assembly 60 simultaneously connects the second negative tab 23 and the fourth negative tab 43. Alternatively, the pole post assembly 60 can be one, the pole post assembly 60 simultaneously connects the first positive tab 12 and the third positive tab 32, and the second negative tab 23 and the fourth negative tab 43 are electrically connected to the battery shell 50. Alternatively, the pole post assembly 60 can be one, the pole post assembly 60 simultaneously connects the second negative tab 23 and the fourth negative tab 43, and the first positive tab 12 and the third positive tab 32 are electrically connected to the battery shell 50.

[0087] In an embodiment, the first positive tab 12 and the second negative tab 23 are insulated, the first positive tab 12 and the fourth negative tab 43 are insulated, the third positive tab 32 and the second negative tab 23 are insulated, and the third positive tab 32 and the fourth negative tab 43 are insulated.

[0088] In an embodiment, as shown in Figures 4 to 6 The battery further comprises an insulating support 70 arranged in the battery cell unit, and further, the insulating support 70 is located between the first positive tab 12 and the third positive tab 32, and between the second negative tab 23 and the fourth negative tab 43, so as to avoid short circuit of the battery cell unit.

[0089] An embodiment of the present application further provides an assembling method of the battery, please refer to Figure 8 The assembling method of the battery comprises:

[0090] S101, connecting the first positive electrode tab 12 of the first battery cell 10 with the third positive electrode tab 32 of the third battery cell 30;

[0091] S103, connecting the second negative electrode tab 23 of the second battery cell 20 with the fourth negative electrode tab 43 of the fourth battery cell 40;

[0092] S105, connecting the first negative electrode tab 13 of the first battery cell 10 with the second positive electrode tab 22 of the second battery cell 20;

[0093] S107, connecting the third negative electrode tab 33 of the third battery cell 30 with the fourth positive electrode tab 42 of the fourth battery cell 40;

[0094] S109, enclosing the battery cell unit formed by the first battery cell 10, the second battery cell 20, the third battery cell 30 and the fourth battery cell 40 in the battery shell 50.

[0095] The assembling method of the battery of one embodiment of the present application connects the first battery cell 10, the second battery cell 20, the third battery cell 30 and the fourth battery cell 40, and stacks the first battery cell 10 and the second battery cell 20, and stacks the third battery cell 30 and the fourth battery cell 40, so that the battery can have sufficient capacity to meet the use requirement. The two electrode leading-out ends of the battery cell unit enclosed in the battery shell 50 are led out from the same side to improve the space utilization rate after the battery is formed, so that the assembling performance of the battery is improved.

[0096] It should be noted that the first positive electrode tab 12 of the first battery cell 10 is connected with the third positive electrode tab 32 of the third battery cell 30, the second negative electrode tab 23 of the second battery cell 20 is connected with the fourth negative electrode tab 43 of the fourth battery cell 40, the first negative electrode tab 13 of the first battery cell 10 is connected with the second positive electrode tab 22 of the second battery cell 20, and the third negative electrode tab 33 of the third battery cell 30 is connected with the fourth positive electrode tab 42 of the fourth battery cell 40. The sequence of the above connection is not limited, and finally two battery cell units stacked in up and down and arranged side by side are formed to meet the capacity requirement of the battery.

[0097] In some embodiments, enclosing the battery cell unit in the battery shell 50 includes forming the battery cell unit on the first shell piece 54 of the battery shell 50, and sealingly connecting the second shell piece 55 of the battery shell 50 with the first shell piece 54. The first shell piece 54 can be used as a support structure during the forming of the battery cell unit, so as to facilitate the connection of the first battery cell 10, the second battery cell 20, the third battery cell 30 and the fourth battery cell 40.

[0098] It should be noted that forming the cell unit on the first shell piece 54 of the battery shell 50 can be considered as at least one of the following processes being completed on the first shell piece 54: connecting the first positive electrode tab 12 of the first cell 10 with the third positive electrode tab 32 of the third cell 30; connecting the second negative electrode tab 23 of the second cell 20 with the fourth negative electrode tab 43 of the fourth cell 40; connecting the first negative electrode tab 13 of the first cell 10 with the second positive electrode tab 22 of the second cell 20; and connecting the third negative electrode tab 33 of the third cell 30 with the fourth positive electrode tab 42 of the fourth cell 40. Alternatively, after the above connections are completed, the cell unit is placed on the first shell piece 54, and then the connection between the second shell piece 55 and the first shell piece 54 is completed.

[0099] In one embodiment, the assembling method of the battery further comprises: before the cell unit is enclosed in the battery shell 50, connecting the first positive electrode tab 12 and the third positive electrode tab 32 to the pole assembly 60 of the battery shell 50, i.e., connecting the first positive electrode tab 12 and the third positive electrode tab 32 to the pole assembly 60 of the first shell piece 54, so that the welding mechanism can be welded from the side where the first positive electrode tab 12 and the third positive electrode tab 32 are located, and compared with welding from the side where the pole assembly 60 is located, the welding energy can be avoided to be too large to cause damage to the pole assembly 60, and the welding is also facilitated.

[0100] Specifically, the first cell 10 and the second cell 20 are placed on the first shell piece 54, the first positive electrode tab 12 of the first cell 10 is welded with the third positive electrode tab 32 of the third cell 30, and is welded and connected with the pole assembly 60, the second negative electrode tab 23 of the second cell 20 is connected with the fourth negative electrode tab 43 of the fourth cell 40, and the first cell 10 and the second cell 20 are stacked, while the third cell 30 and the fourth cell 40 are stacked, the first negative electrode tab 13 of the first cell 10 is connected with the second positive electrode tab 22 of the second cell 20, the third negative electrode tab 33 of the third cell 30 is connected with the fourth positive electrode tab 42 of the fourth cell 40, and then the second shell piece 55 is connected with the first shell piece 54.

[0101] In one embodiment, the assembling method of the battery further comprises: before the cell unit is enclosed in the battery shell 50, connecting the second negative electrode tab 23 and the fourth negative electrode tab 43 to the pole assembly 60 of the battery shell 50.

[0102] It should be noted that the first positive tab 12 and the third positive tab 32 can be connected to one pole assembly 60 of the battery shell 50, and the second negative tab 23 and the fourth negative tab 43 can be connected to another pole assembly 60 of the battery shell 50. The above-mentioned connection can be welding, and the welding between one pole assembly 60 and the tab needs to be performed from the side where the pole assembly 60 is located.

[0103] In one embodiment, when the first positive tab 12 and the third positive tab 32 are connected to the pole assembly 60 of the battery shell 50, the second negative tab 23 and the fourth negative tab 43 are electrically connected to the battery shell 50, or when the second negative tab 23 and the fourth negative tab 43 are connected to the pole assembly 60 of the battery shell 50, the first positive tab 12 and the third positive tab 32 are electrically connected to the battery shell 50, so that the battery shell 50 and the pole assembly 60 can be used as two electrode lead-out ends of the battery, respectively.

[0104] It should be noted that, taking the connection of the first positive tab 12 and the third positive tab 32 to the pole assembly 60 of the battery shell 50 as an example, when the second shell part 55 is connected to the first shell part 54, the protruding structure 511 of the second shell part 55 can be in reliable contact with the second negative tab 23 and the fourth negative tab 43, so as to realize the electrical connection between the second shell part 55 and the second negative tab 23 and the fourth negative tab 43. An adapter structure can be provided between the protruding structure 511 and the second negative tab 23 and the fourth negative tab 43.

[0105] In one embodiment, the assembling method of the battery further includes: insulating the first positive tab 12 and the second negative tab 23 before the cell unit is enclosed in the battery shell 50; insulating the first positive tab 12 and the fourth negative tab 43; insulating the third positive tab 32 and the second negative tab 23; and insulating the third positive tab 32 and the fourth negative tab 43, so as to avoid internal short circuit of the battery.

[0106] In some embodiments, the above-mentioned insulating treatment can be performed by an insulating coating, for example, the opposite sides of the positive tab and the negative tab are coated with a coating, such as aluminum oxide (Al2O3), zirconium oxide (ZrO2), and the like. Ceramic material is used to avoid internal short circuit of the battery.

[0107] In some embodiments, the insulating treatment is performed by an insulating support 70, so as to ensure reliable insulation between the positive tab and the negative tab, and the assembling efficiency can be improved. The insulating support 70 can also serve as a fixing support.

[0108] It should be noted that the insulating support 70 is arranged between the positive and negative tabs before the first, second, third and fourth battery cells 10, 20, 30 and 40 are completely welded, thereby facilitating the installation of the insulating support 70.

[0109] In one embodiment, the first positive tab 12 is welded to the third positive tab 32, the second negative tab 23 is welded to the fourth negative tab 43, the first negative tab 13 is welded to the second positive tab 22, and the third negative tab 33 is welded to the fourth positive tab 42, thereby ensuring the stability of the structure connection and improving the connection efficiency. The welding described above can be performed by laser welding, ultrasonic welding, resistance welding, etc., which is not limited herein. The direct connection of the tabs can be butt joint or overlapping arrangement, which is not limited herein.

[0110] In one embodiment, the battery assembly method is used to form the battery described above, and the specific structure of the battery in the present embodiment can be referred to the specific structure of the battery described above, which is not repeated herein.

[0111] One embodiment of the present application also provides a battery assembly method, which is described below with reference to Figure 9 The battery assembly method comprises the following steps:

[0112] S201, connecting the first negative tab 13 of the first battery cell 10 to the second positive tab 22 of the second battery cell 20;

[0113] S203, connecting the first positive tab 12 of the first battery cell 10 to the pole assembly 60 of the first housing member 54, or connecting the second negative tab 23 of the second battery cell 20 to the pole assembly 60 of the first housing member 54;

[0114] S205, sealingly connecting the second housing member 55 to the first housing member 54 to enclose the first and second battery cells 10 and 20 in the battery housing 50.

[0115] The battery assembly method of one embodiment of the present application connects the first and second battery cells 10 and 20, thereby ensuring that the battery has sufficient capacity to meet the use requirements. The two electrode lead-out ends of the battery cell units enclosed in the battery housing 50 are led out from the same side to improve the space utilization rate after the battery is formed, thereby improving the assembly performance of the battery.

[0116] In one embodiment, when the first positive tab 12 is connected to the pole assembly 60, the second negative tab 23 is electrically connected to the battery housing 50, or when the second negative tab 23 is connected to the pole assembly 60, the first positive tab 12 is electrically connected to the battery housing 50.

[0117] In one embodiment, the first positive electrode tab 12 and the second negative electrode tab 23 are insulated before the second housing part 55 is connected with the first housing part 54. An insulating support 70 is arranged between the first positive electrode tab 12 and the second negative electrode tab 23 for insulation.

[0118] In one embodiment, the assembling method of the battery is used to form the battery described above. The specific structure of the battery in this embodiment can be referred to the specific structure of the battery described above, which is not repeated here. The steps of the assembling method of the battery in this embodiment can also be referred to the assembling method of the battery described above, which is not repeated here.

[0119] One embodiment of the present application also provides a battery pack comprising the battery described above.

[0120] The battery pack of one embodiment of the present application comprises the battery, and the battery comprises the cell unit and the battery housing 50, and the cell unit is arranged in the battery housing 50. The cell unit comprises the first cell 10 and the second cell 20 stacked together, so that the thickness of the cell unit can be increased to meet the capacity requirement of the cell unit, and the forming difficulty of the cell can be reduced for the cell unit with high capacity requirement, so that the performance of the cell unit is improved. By arranging the first positive electrode tab 12 of the first cell 10 and the second negative electrode tab 23 of the second cell 20 on the same side, and arranging the first negative electrode tab 13 of the first cell 10 and the second positive electrode tab 22 of the second cell 20 on the same side, the first cell 10 and the second cell 20 can be connected in series subsequently, and the two electrode lead-out ends of the cell unit can be led out from the same side to improve the space utilization of the battery, and the first positive electrode tab 12 and the second negative electrode tab 23 can be arranged in sequence in the height space, so that they do not overlap, and thus the first positive electrode tab 12 and the second negative electrode tab 23 can be full tabs, so that the overcurrent capacity of the tabs is improved to improve the safety performance of the battery pack.

[0121] In one embodiment, the battery pack is a battery module or a battery pack.

[0122] The battery module comprises a plurality of batteries, and the battery module can further comprise end plates and side plates for fixing the plurality of batteries.

[0123] It should be noted that the plurality of batteries can be arranged in the battery box after forming the battery module, and the plurality of batteries can be fixed by the end plates and the side plates. The plurality of batteries can be directly arranged in the battery box, i.e., the plurality of batteries do not need to be grouped, and in this case, the end plates and the side plates can be removed.

[0124] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the concepts disclosed herein. It is intended that the disclosure be construed as including any paterns of this disclosure that can be presented during prosecution of the patent application. Specification and drawings are, therefore, to be regarded in an illustrative rather than a restrictive sense. The true scope and spirit of the disclosure are indicated by the appended claims.

[0125] It is to be understood that the disclosure is not limited to the precise construction herein described and as shown in the drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope thereof. The scope of the disclosure is indicated by the appended claims, rather than the description and drawings.

Claims

1. An electric cell unit, characterized by comprising: A battery cell unit for being disposed in a battery case, the battery cell unit comprising: a first battery cell (10) including a first battery cell body (11), a first positive electrode tab (12), and a first negative electrode tab (13), the first positive electrode tab (12) and the first negative electrode tab (13) extending from opposite ends of the first battery cell body (11) in a first direction and a second direction, respectively; a second battery cell (20) stacked with the first battery cell (10), the second battery cell (20) being stacked with the first battery cell (10) in a stacking direction perpendicular to an extension direction of the first positive electrode tab (12) when flattened, the second battery cell (20) including a second battery cell body (21), a second positive electrode tab (22), and a second negative electrode tab (23), the second positive electrode tab (22) and the second negative electrode tab (23) extending from opposite ends of the second battery cell body (21) in the second direction and the first direction, respectively, the first negative electrode tab (13) being connected to the second positive electrode tab (22), the first positive electrode tab (12) and the second negative electrode tab (23) being located on the same side; a third battery cell (30) including a third battery cell body (31), a third positive electrode tab (32), and a third negative electrode tab (33), the third positive electrode tab (32) and the third negative electrode tab (33) extending from opposite ends of the third battery cell body (31) in the second direction and the first direction, respectively; a fourth battery cell (40) stacked with the third battery cell (30), the fourth battery cell (40) being stacked with the third battery cell (30) in a stacking direction perpendicular to an extension direction of the third positive electrode tab (32) when flattened, the fourth battery cell (40) including a fourth battery cell body (41), a fourth positive electrode tab (42), and a fourth negative electrode tab (43), the fourth positive electrode tab (42) and the fourth negative electrode tab (43) extending from opposite ends of the fourth battery cell body (41) in the first direction and the second direction, respectively; the first battery cell (10) and the third battery cell (30) being disposed in the first direction, the first positive electrode tab (12) being connected to the third positive electrode tab (32), the second battery cell (20) and the fourth battery cell (40) being disposed in the first direction, the second negative electrode tab (23) being connected to the fourth negative electrode tab (43), the third negative electrode tab (33) being connected to the fourth positive electrode tab (42).

2. The cell unit of claim 1, wherein, A projection of the first positive electrode tab (12) on a projection plane perpendicular to a stacking direction of the first cell (10) and the second cell (20) is a first positive projection, a projection of the second negative electrode tab (23) on the projection plane is a second positive projection, at least part of the first positive projection and the second positive projection overlap, and / or a projection of the first negative electrode tab (13) on the projection plane is a third positive projection, a projection of the second positive electrode tab (22) on the projection plane is a fourth positive projection, at least part of the third positive projection and the fourth positive projection overlap.

3. A battery, characterized by The battery includes the cell unit of claim 1 or 2 and a battery case (50), and the cell unit is arranged in the battery case (50).

4. The battery of claim 3, wherein, At least one of the first positive electrode tab (12), the first negative electrode tab (13), the second positive electrode tab (22), the second negative electrode tab (23), the third positive electrode tab (32), the third negative electrode tab (33), the fourth positive electrode tab (42), and the fourth negative electrode tab (43) is a full tab.

5. The battery of claim 3, wherein, The battery further includes: A pole assembly (60) is arranged in the battery case (50), and the pole assembly (60) is connected to the first positive electrode tab (12) or the second negative electrode tab (23).

6. The battery of claim 5, wherein, The battery case (50) includes a steel shell, the second negative electrode tab (23) is electrically connected to the steel shell, and the first positive electrode tab (12) is connected to the pole assembly (60). Or, the battery case (50) includes an aluminum shell, the first positive electrode tab (12) is electrically connected to the aluminum shell, and the second negative electrode tab (23) is connected to the pole assembly (60).

7. The battery of claim 5, wherein, The battery case (50) is provided with a recess (51), and the recess (51) is used to accommodate a pole assembly of another battery.

8. The battery of claim 7, wherein, The pole assembly (60) is located outside the range of the recess (51). The recess (51) is arranged on a side of the battery case (50) away from the pole assembly (60).

9. The battery of claim 8, wherein, The recess (51) at least partially overlaps the pole assembly (60) along the normal projection of the surface of the battery case (50) on which the pole assembly (60) is arranged.

10. The battery of claim 5, wherein, The battery case (50) is provided with a recess (51), and the pole assembly (60) is located in the recess (51).

11. The battery of claim 5, wherein, The battery case (50) is provided with a recess (51), and the recess (51) is used to connect with a battery box.

12. The battery of claim 5, wherein, The battery case (50) includes: A first case member (54); A second case member (55) is connected to the first case member (54) to enclose the cell unit.

13. The battery of any one of claims 5-12, wherein, The battery case (50) includes two opposite first surfaces (52) and four second surfaces (53) arranged around the first surfaces (52), and the area of the first surface (52) is greater than the area of the second surface (53). The pole assembly (60) is arranged on the first surface (52).

14. The battery of claim 13, wherein, The pole post assembly (60) is arranged in the middle of the first surface (52) so that the pole post assembly (60) connects the first positive electrode tab (12) and the third positive electrode tab (32) at the same time, or the pole post assembly (60) connects the second negative electrode tab (23) and the fourth negative electrode tab (43) at the same time.

15. A method of assembling a battery, characterized by It comprises: connecting the first positive electrode tab (12) of the first battery cell (10) with the third positive electrode tab (32) of the third battery cell (30); connecting the second negative electrode tab (23) of the second battery cell (20) with the fourth negative electrode tab (43) of the fourth battery cell (40); connecting the first negative electrode tab (13) of the first battery cell (10) with the second positive electrode tab (22) of the second battery cell (20); connecting the third negative electrode tab (33) of the third battery cell (30) with the fourth positive electrode tab (42) of the fourth battery cell (40); enclosing the battery cell unit formed by the first battery cell (10), the second battery cell (20), the third battery cell (30) and the fourth battery cell (40) in the battery shell (50).

16. The method of assembling a battery of claim 15, wherein, It comprises: forming the battery cell unit on the first shell part (54) of the battery shell (50); connecting the second shell part (55) of the battery shell (50) with the first shell part (54).

17. The method of assembling a battery according to claim 15 or 16, wherein It further comprises: before enclosing the battery cell unit in the battery shell (50), connecting the first positive electrode tab (12) and the third positive electrode tab (32) to the pole post assembly (60) of the battery shell (50); or connecting the second negative electrode tab (23) and the fourth negative electrode tab (43) to the pole post assembly (60) of the battery shell (50).

18. The method of assembling a battery of claim 17, wherein, When the first positive electrode tab (12) and the third positive electrode tab (32) are connected to the pole post assembly (60) of the battery shell (50), the second negative electrode tab (23) and the fourth negative electrode tab (43) are electrically connected to the battery shell (50), or when the second negative electrode tab (23) and the fourth negative electrode tab (43) are connected to the pole post assembly (60) of the battery shell (50), the first positive electrode tab (12) and the third positive electrode tab (32) are electrically connected to the battery shell (50).

19. The method of Claim 15, wherein It further comprises: before enclosing the battery cell unit in the battery shell (50), insulating the first positive electrode tab (12) and the second negative electrode tab (23), the first positive electrode tab (12) and the fourth negative electrode tab (43), the third positive electrode tab (32) and the second negative electrode tab (23), and the third positive electrode tab (32) and the fourth negative electrode tab (43) by an insulating support (70).

20. A method of assembling a battery, characterized by It comprises: connecting the first negative electrode tab (13) of the first battery cell (10) with the second positive electrode tab (22) of the second battery cell (20); connecting a first positive tab (12) of the first cell (10) to a post assembly (60) of a first housing member (54), or connecting a second negative tab (23) of the second cell (20) to the post assembly (60) of the first housing member (54); connecting a second housing member (55) to the first housing member (54) to enclose the first cell (10) and the second cell (20) within a battery housing (50).

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