CN219658930U

CN219658930U - Battery cell module, battery cell assembly and laser welding tool

Info

Publication number: CN219658930U
Application number: CN202090001091.XU
Authority: CN
Inventors: 郭伟华; 刘丽荣; 林桐华; 邬亨英; 刘献华; 王斌斌
Original assignee: Farasis Energy Ganzhou Co Ltd; Farasis Energy Zhenjiang Co Ltd
Current assignee: Farasis Energy Ganzhou Co Ltd; Farasis Energy Zhenjiang Co Ltd
Priority date: 2019-12-09
Filing date: 2020-12-09
Publication date: 2023-09-08
Anticipated expiration: 2030-12-09
Also published as: WO2021115336A1; CN111106298B; CN111106298A

Abstract

The embodiment of the utility model provides a battery cell module, a battery cell assembly and a laser welding tool, wherein the battery cell module comprises at least one group of battery cell groups, each battery cell group comprises a plurality of stacked battery cells, the bending directions of the second parts of the positive electrode lugs and the negative electrode lugs of the battery cells are opposite, and the bending directions of the second parts of the positive electrode lugs and the negative electrode lugs of every two adjacent battery cells are the same and are mutually overlapped; or, in every two adjacent cells, the second part of the positive electrode tab of one cell is overlapped with the second part of the negative electrode tab of the other cell; or, the two tabs of each cell are respectively located at two opposite sides of the cell, and the second parts of the first tabs of each two adjacent cells are overlapped with each other or the first parts of the second tabs of each two adjacent cells are overlapped with each other. The scheme of the utility model not only can realize the electric connection of a plurality of battery cells, but also can ensure that the current-carrying requirement is met, and can reduce the volume of the battery cell module.

Description

Battery cell module, battery cell assembly and laser welding tool

Technical Field

The utility model relates to the technical field of batteries and battery installation, in particular to a battery cell module, a battery cell assembly and a laser welding tool.

Background

At present, for a soft package battery, a busbar is generally used for electric connection between lugs of a plurality of electric cells, so that electric connection between the electric cells is realized. However, in order to meet the current-carrying requirement, the size of the bus bar is generally larger, which increases the volume of the battery cell module, and the production efficiency is lower and the manufacturing cost of the battery cell is increased due to the complex manufacturing process of the bus bar.

Disclosure of Invention

The utility model aims to solve the problems of larger cell module volume, lower production efficiency and higher cell manufacturing cost caused by the arrangement of a bus bar in the prior art.

In order to achieve the above object, a first aspect of the present utility model provides a battery cell module, which includes at least one group of battery cell modules, each group of battery cell modules includes a plurality of stacked battery cells, and two tabs of each battery cell are respectively a positive electrode tab and a negative electrode tab;

each tab includes a first portion extending from the same side of the cell and a second portion bent relative to the first portion; the bending directions of the second parts of the positive electrode lugs and the negative electrode lugs of the battery cells are opposite, and the bending directions of the second parts of the positive electrode lugs of every two adjacent battery cells are the same and are mutually overlapped; the bending directions of the second parts of the cathode lugs of every two adjacent electric cores are the same and are mutually overlapped so as to realize the parallel connection of a plurality of electric cores; or, in each two adjacent electric cores, the second part of the positive electrode tab of one electric core is overlapped with the second part of the negative electrode tab of the other electric core, so as to realize the serial connection of each two adjacent electric cores;

Or, the positive electrode tab and the negative electrode tab of each battery cell are respectively located at two opposite sides of the battery cell, and in the two tabs of each battery cell, a first tab comprises the first part and the second part, and a second tab comprises the first part; wherein the second portions of the first tabs of each adjacent two of the cells overlap each other or the first portions of the second tabs of each adjacent two of the cells overlap each other.

Optionally, the second portions of the tabs of two adjacent cells are partially staggered in a direction perpendicular to the stacking direction of the plurality of cells.

Optionally, the tabs of every two adjacent cells are connected by laser welding.

Optionally, the battery cell groups are multiple groups, and the multiple groups of battery cell groups are arranged along the stacking direction of the multiple battery cells;

in each two adjacent battery cell groups, the positive electrode lug of the battery cell in one battery cell group is electrically connected with the negative electrode lugs of a plurality of battery cells in the other battery cell group so as to realize the serial connection of the two adjacent battery cell groups; or, the positive electrode lugs of the electric cores in the two adjacent electric core groups are electrically connected, and the negative electrode lugs of the electric cores in the two adjacent electric core groups are electrically connected, so that the parallel connection of the two adjacent electric core groups is realized.

Optionally, the number of the tabs of each battery cell is two, namely a positive electrode tab and a negative electrode tab, and the two tabs of each battery cell are respectively located at two opposite sides of the battery cell, a first tab comprises a first part extending from the battery cell and a second part bent relative to the first part, and a second tab comprises a first part extending from the battery cell; wherein the second parts of the first tabs of each two adjacent cells overlap each other or the first parts of the second tabs of each two adjacent cells overlap each other;

the battery cell module comprises at least one battery cell unit, each battery cell unit comprises a plurality of battery cell groups, and in each two adjacent battery cell groups, the lugs of the two adjacent battery cells are electrically connected;

when the number of the battery cells is multiple, the same side lug of each battery cell in one battery cell unit is electrically connected with the same side lug of each battery cell in the other battery cell unit in a one-to-one correspondence manner in every two adjacent battery cell units, so that the electrical connection between the two adjacent battery cell units is realized.

The second aspect of the present utility model provides a battery cell assembly, which includes the above battery cell module provided by the embodiment of the present utility model.

Optionally, the electric core module is a plurality of, and is adjacent two be provided with the fire prevention piece between the electric core module.

The third aspect of the utility model provides a laser welding tool, which is used for assisting in electrically connecting lugs of every two adjacent electric cores in a laser welding mode, wherein each lug comprises a first part extending from the same side of each electric core and a second part bent relative to the first part; the second parts of the lugs of every two adjacent battery cells are identical in bending direction and are mutually overlapped;

the laser welding tool comprises a laser tool component, wherein the laser tool component is used for being positioned on one side, close to the battery cell, of the second part during laser welding so as to support the second part and protect the second part and a part positioned on one side, close to the battery cell, of the second part.

Optionally, the laser fixture assembly includes a first laser fixture and a second laser fixture, where the first laser fixture and the second laser fixture are both located at a side of the second portion, which is close to the electric core, and the second laser fixture is located at a side of the first laser fixture, which is far away from the electric core, and slots through which the first portion passes are both provided in the first laser fixture and the second laser fixture; wherein, the liquid crystal display device comprises a liquid crystal display device,

The first laser jig is used for absorbing laser energy;

the second laser jig is used for supporting the second part and is made of a material transmitting laser.

Optionally, the first laser fixture includes a first sub-fixture and a second sub-fixture, and the second laser fixture includes a third sub-fixture and a fourth sub-fixture, and is disposed corresponding to the first sub-fixture and the second sub-fixture respectively;

the slots comprise a first sub-slot and a second sub-slot, wherein the first sub-slot and the second sub-slot are respectively arranged on the first sub-jig and the second sub-jig, and the second sub-slot is respectively arranged on the third sub-jig and the fourth sub-jig;

the laser welding tool further comprises a first auxiliary component and a second auxiliary component, wherein the first auxiliary component is used for driving the first sub-jig and the third sub-jig to synchronously move, and the second auxiliary component is used for driving the second sub-jig and the fourth sub-jig to synchronously move so that the first sub-jig and the second sub-jig are mutually butted or separated, and meanwhile the third sub-jig and the fourth sub-jig are mutually butted or separated; in addition, in the process of mutual butt joint or separation of the first sub-jig and the second sub-jig, the corresponding first part moves in or moves out of the first sub-slot; the third sub-jig and the fourth sub-jig are in butt joint or separated, and the corresponding first part moves in or moves out of the second sub-slot.

Optionally, the laser jig assembly comprises a first laser jig and a second laser jig, wherein,

the first laser jig is positioned on one side of the second part, which is close to the battery cell, and is provided with a slot for the first part to pass through, the first laser jig is used for supporting the second part, and the first laser jig is also provided with a laser avoiding slot;

the second laser jig is located at one side of the second part far away from the battery cell and used for pressing the second part, and a through groove for laser to pass through is formed in the position, corresponding to each second part, of the second laser jig.

the slots comprise sub slots respectively arranged on the first sub jig and the second sub jig;

the laser welding tool further comprises a first auxiliary component and a second auxiliary component, wherein the first auxiliary component is used for driving the first sub-jig and the third sub-jig to synchronously move, and the second auxiliary component is used for driving the second sub-jig and the fourth sub-jig to synchronously move so that the first sub-jig and the second sub-jig are mutually close to or separated from each other, and meanwhile the third sub-jig and the fourth sub-jig are mutually close to or separated from each other; and in the process that the first sub-jig and the second sub-jig are mutually close to or separated from each other, the corresponding first part moves in or moves out of the sub-slot.

Optionally, the laser welding tool further includes a bottom plate, the cell module is disposed on the bottom plate, and a guide rail is disposed on the bottom plate, and an extending direction of the guide rail is perpendicular to a stacking direction of the plurality of cells; the first auxiliary assembly and the second auxiliary assembly are respectively provided with a sliding structure in sliding fit with the guide rail, and the sliding structures are used for driving the first auxiliary assembly and the second auxiliary assembly to slide along the guide rail.

Optionally, two clamping plates are further disposed on the bottom plate and located between the first auxiliary assembly and the second auxiliary assembly, and the two clamping plates are disposed opposite to each other in the stacking direction of the plurality of cells, and are used for clamping the cell module between the two clamping plates.

Optionally, the laser fixture assembly further includes a support cooling mechanism, the support cooling mechanism is connected with the first laser fixture, and the second laser fixture is connected with the first laser fixture; the support cooling mechanism is used for supporting the second laser jig and the first laser jig and cooling the second laser jig and the first laser jig.

According to the technical scheme of the cell module, the connecting method thereof, the cell assembly and the laser welding tool, through the fact that the lugs of every two adjacent cells are electrically connected in a direct contact mode, not only can the electric connection of a plurality of cells be achieved, but also the current carrying requirement can be met, and a busbar can be omitted, so that the volume of the cell module can be reduced, the manufacturing process of the module is simplified, the production efficiency can be improved, and the manufacturing cost of the cells is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a block diagram of a battery cell module provided in an embodiment of the present utility model;

fig. 2A is an enlarged view of a partial structure of a battery cell module according to an embodiment of the present utility model;

FIG. 2B is a top view of adjacent tabs employed in a variation of the embodiment of the present utility model;

fig. 2C is an enlarged view of a partial structure of a battery cell module according to a modified embodiment of the present utility model;

fig. 3A is a block diagram of a battery cell module according to another embodiment of the present utility model;

fig. 3B is an enlarged view of a portion of the cell module of fig. 3A;

FIG. 3C is an enlarged view of another partial structure of the battery cell module of FIG. 3A;

fig. 3D is a block diagram of a battery cell module according to another embodiment of the present utility model;

Fig. 3E is a block diagram of a battery cell module according to still another embodiment of the present utility model;

FIG. 4 is an exploded view of a laser welding tool according to an embodiment of the present utility model;

FIG. 5A is a block diagram of the laser welding tool of FIG. 4 in a first state;

FIG. 5B is a block diagram of the laser welding tool of FIG. 4 in a second state;

FIG. 6 is a block diagram of a positioning structure employed by an embodiment of the present utility model;

FIG. 7 is an exploded view of another embodiment of a laser welding tool according to the present utility model;

fig. 8A is a structural diagram of the second laser fixture in fig. 7 in a first state;

fig. 8B is a structural diagram of the first laser fixture in fig. 7 in a first state.

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

Referring to fig. 1 and 2A, an embodiment of the present utility model provides a battery module 1, which includes at least one set of battery cell groups, where each set of battery cell groups includes a plurality of battery cells stacked in an X direction, for example, as shown in fig. 1, the plurality of battery cells are stacked in sequence, and the battery cell groups are three groups, and the three groups of battery cell groups (11, 12, 13) are sequentially disposed along the stacking direction (i.e., the X direction) of the plurality of battery cells, and two adjacent battery cell groups may have a space therebetween, or may also be stacked with each other, or may also be disposed with buffer isolation materials such as foam.

Wherein the first group of cells 11 comprises three cells (11 a,11b,11 c); the second group of cells 12 comprises three cells (12 a,12b,12 c); the third group 13 of cells comprises three cells (13 a,13b,13 c). And, every electric core has two electrode tabs 21, is anodal electrode tab and negative pole electrode tab respectively, and both are located the same side of electric core, and the electrode tab 21 of every adjacent two electric cores adopts the direct contact's mode electric connection to realize the electric connection of a plurality of electric cores. Taking the first group of cells 11 as an example, positive electrode lugs of three cells (11 a,11b,11 c) are sequentially contacted, and negative electrode lugs are sequentially contacted, so that the three cells (11 a,11b,11 c) are connected in parallel.

It should be noted that, the electrical connection manner between the plurality of electric cores in the same electric core group may be various, and is not limited to the parallel manner adopted in the embodiment, and may be series connection or series-parallel connection. For example, for the same group of cells, in every two adjacent cells, the positive electrode tab of one cell is in direct contact with the negative electrode tab of the other cell, so as to realize the serial connection of every two adjacent cells. The electrical connection manner between the different cell groups may be various, but is not limited to the serial connection adopted in the embodiment, and may be parallel connection or series-parallel connection. For example, in each two adjacent groups of cells, the positive electrode tabs of the cells in the two adjacent groups of cells are electrically connected, and the negative electrode tabs of the cells in the two adjacent groups of cells are electrically connected, so as to realize parallel connection of the two adjacent groups of cells.

It should be further noted that, in the embodiment of the present utility model, the number of groups of the battery cell groups and the number of battery cells in the same group of battery cell groups are not limited.

According to the cell module 1 provided by the embodiment of the utility model, the lugs 21 of every two adjacent cells are electrically connected in a direct contact mode, so that the electrical connection of a plurality of cells can be realized, the current carrying requirement is met, and a busbar is not required, so that the volume of the cell module can be reduced, the manufacturing process of the module is simplified, the production efficiency is improved, and the manufacturing cost of the cells is reduced.

In some embodiments, there are various ways in which two adjacent tabs 21 are in direct contact, for example, as shown in fig. 1, each tab 21 includes a first portion 211 extending from the same side of the cell (for example, extending in the Z direction in fig. 2A) and a second portion 212 bent with respect to the first portion 211, where an angle between the second portion 212 and the first portion 211 is, for example, 90 °, and this angle is beneficial for welding the second portions 212 of two adjacent tabs 21.

In some embodiments, as shown in fig. 2A, for each cell, the bending directions of the second portions 212 of the positive electrode tab and the negative electrode tab are opposite, for example, the second portion 212 of the positive electrode tab is bent toward one of the X1 direction and the X2 direction in fig. 2A, the second portion 212 of the negative electrode tab is bent toward the other of the X1 direction and the X2 direction in fig. 2A, and in the same group of cells, the polarities are the same, and the bending directions of the second portions 212 of the adjacent two tabs are the same and overlap each other to achieve parallel connection of the adjacent two cells. The overlapping means that the second portions 212 of the adjacent two tabs 21 overlap each other in the Z direction. The direct contact mode of utilizing the lap joint of the second part 212 of the tab not only can realize the electric connection among a plurality of electric cores, but also can meet the current carrying requirement, and also provides convenience for the subsequent tab welding. Of course, in practical application, the bending directions of the second portions of the two adjacent tabs may be opposite or form an included angle, and the two adjacent tabs are not limited to overlap each other in the Z direction, in practical application, the two adjacent tabs may overlap each other in any direction in the three-dimensional space, and the overlapping sequence of the second portions of the two adjacent tabs may be adjusted arbitrarily, for example, in the Z direction, for the second portions of the two adjacent tabs, any one of the second portions may be located above the other second portion.

In some embodiments, as shown in fig. 2A, for the same group of cells, the bending directions of the second portions 212 of the positive electrode tabs of every two adjacent cells are the same and overlap each other, and the bending directions of the second portions 212 of the negative electrode tabs of every two adjacent cells are the same and overlap each other, so that not only can parallel connection of two adjacent cells be achieved, but also when more than three cells are connected in parallel, by making the bending directions of the second portions of the positive electrode tabs the same, the bending directions of the second portions of the negative electrode tabs are the same, so that more than three positive electrode tabs overlap each other in sequence, and more than three negative electrode tabs overlap each other in sequence, so that the overlapping manner is simpler and convenience is provided for subsequent tab welding. Of course, in practical application, a suitable tab overlapping mode can be selected according to the electrical connection modes of the plurality of electric cores.

In some embodiments, for different cell groups, in each adjacent two cell groups, the positive tabs of a plurality of cells in one cell group are electrically connected with the negative tabs of a plurality of cells in the other cell group, so as to realize the serial connection of the adjacent two cell groups. For example, as shown in fig. 1 and 2A, in the second group of cells 12, the second portions 212 of the negative tabs (indicated by minus signs "-" in fig. 2A) of the three cells (12A, 12b,12 c) are each bent in the X1 direction in fig. 1, and the second portions 212 of the positive tabs (indicated by plus signs "+" in fig. 2A) are each bent in the X2 direction in fig. 1; in the third group of cells 13, the second portions 212 of the negative electrode tabs of the three cells (13 a,13b,13 c) are all bent in the X1 direction in fig. 1, and the second portions 212 of the positive electrode tabs are all bent in the X2 direction in fig. 1; in the first group of cells 11, the second portions 212 of the positive electrode tabs of the three cells (11 a,11b,11 c) are bent in the X2 direction in fig. 1, and the second portions 212 of the negative electrode tabs are bent in the X1 direction in fig. 1, wherein the second portions 212 of the negative electrode tabs of the cells 11a in the first group of cells 11 overlap the second portions 212 of the positive electrode tabs of the cells 12a in the adjacent second group of cells 12, and the second portions 212 of the negative electrode tabs of the cells 12c in the second group of cells 12 overlap the second portions 212 of the positive electrode tabs of the cells 13c in the adjacent third group of cells 13, so that the series connection of the three groups of cells is realized.

The second parts 212 of every two adjacent lugs 21 are in lap joint to realize the electric connection of every two adjacent lugs 21, so that the requirements of current carrying can be met, and a busbar is not needed, thereby reducing the volume of the battery cell module, simplifying the manufacturing process of the module, improving the production efficiency and reducing the manufacturing cost of the battery cell.

It should be noted that, in practical applications, the size and shape of the second portion 212 of the tab 21 and the contact area between the two second portions 212 overlapping each other may be freely set according to the actual requirements of current carrying.

In some embodiments, the tabs 21 of each adjacent two cells are optionally connected by laser welding. The tab 21 can be easily welded by laser to enable welding together of the tabs 21 of each adjacent two of the cells.

In some embodiments, optionally, foam is disposed between each adjacent two of the cells. The foam plays a role in buffering between two adjacent electric cores, so that impact friction damage between the two adjacent electric cores is avoided, meanwhile, because the thickness of each electric core is different, the foam is used for filling the thickness difference, and plays a positive role in controlling the flatness of the electric core module; and meanwhile, the foam is used for absorbing thermal expansion among the battery cores, so that the thermal runaway risk of the battery core module is effectively reduced.

As a modified embodiment of the present embodiment, as shown in fig. 2B, the second portions of the tabs of the adjacent two cells are partially staggered in the direction perpendicular to the stacking direction of the plurality of cells (i.e., the Y direction in fig. 3). Taking the second portions (212 a ',212b',212c ') of the tabs of three cells stacked in sequence as an example, the middle second portion 212b' is offset by a part in the Y direction with respect to the rightmost second portion 212a ', the leftmost second portion 212c' is offset by a part in the Y direction with respect to the middle second portion 212b ', and the three second portions (212 a',212b ',212 c') overlap in sequence. This also allows for electrical connection of multiple cells.

As a modified embodiment of the present embodiment, as shown in fig. 2C, the cell module includes three cell modules (11 ',12',13 ') and are sequentially arranged in the stacking direction of the plurality of cells, wherein the first cell module 11' includes three cells (11 a ',11b ',11C '); the second group of cells 12 'comprises three cells (12 a',12b ',12 c'); the third group 13 of cells comprises two cells (13 a ',13 b'). And each battery cell is provided with two electrode lugs, namely a positive electrode lug and a negative electrode lug, which are positioned on the same side of the battery cell, and the electrode lugs of every two adjacent battery cells are electrically connected in a direct contact mode so as to realize the electrical connection of a plurality of battery cells.

For example, in the first group of battery cells 11', the battery cell 11a' has a positive tab 2121a and a negative tab 2122a; the cell 11b' has a positive electrode tab 2121b and a negative electrode tab 2122b; the battery cell 11c ' has a positive electrode tab 2121c and a negative electrode tab 2122c, wherein the negative electrode tab 2122a of the battery cell 11a ' is opposite to the bending direction of the positive electrode tab 2121b of the adjacent battery cell 11b ', and the second parts are mutually overlapped; similarly, the negative electrode tab 2122b of the cell 11b 'and the positive electrode tab 2121c of the adjacent cell 11c' are bent in opposite directions, and the second portions are overlapped with each other, so that a plurality of cells in the same cell group are sequentially connected in series. And, the negative electrode tab 2122c of the cell 11c 'in the first group of cell groups 11' and the positive electrode tab 2121d of the cell 11a 'in the second group of cell groups 12' are opposite in bending direction, the second parts are mutually overlapped, and the like, so that different cell groups can be sequentially connected in series.

It should be noted that, the electrical connection manner between the plurality of electric cores in the same electric core group may be various, and is not limited to the serial manner adopted in the present modified embodiment, and may be parallel connection or series-parallel connection. The electrical connection manner between the different cell groups may be various, but is not limited to the serial connection adopted in the present modified embodiment, and may be parallel connection or series-parallel connection.

It should be noted that, in the embodiment of the present utility model, the extending direction of the first portion 211 of the tab 21 is not limited, and the manner of directly contacting the two adjacent tabs 21 is not limited to the overlapping manner adopted in the embodiment.

As a modification of the present embodiment, referring to fig. 3A to 3C together, the present modification provides a cell module 9 including a plurality of cell units electrically connected in sequence in the X direction, each cell unit including a plurality of groups of cell modules 91 stacked in sequence in the Z direction, each group of cell modules 91 including a plurality of cells stacked in sequence in the Z direction. For example, fig. 3A shows three cell units (I, II, III) electrically connected in sequence in the X direction, and fig. 3B and 3C show that each cell unit includes three groups of cell groups 91 stacked in sequence in the Z direction, each group of cell groups 91 includes three cells stacked in sequence in the Z direction, for example, for cell unit I, each group of cell groups 91 included therein includes three cells 91a; for the cell unit II, each of the cell groups 91 included therein includes three cells 91b; for the cell unit III, each of the cell groups 91 includes three cells 91c.

Moreover, each cell (e.g., cell 91 a) has two tabs, a negative tab and a positive tab, respectively, that are located on opposite sides of the cell. The tabs of every two adjacent cells are electrically connected in a direct contact manner, wherein the tabs of every two adjacent cells can be in the same group of cells, or between two adjacent groups of cells, or between two adjacent cells so as to realize the electrical connection of a plurality of cells in the same group of cells, the electrical connection between different cell groups and the electrical connection between different cell units. The electrical connection may be parallel, serial or parallel.

In some embodiments, as shown in fig. 3B, for the cell unit I and the cell unit III, the two tabs of each cell are different in structure, namely a bent tab 911 and a non-bent tab 911'; for the cell unit II, the two tabs of each cell 91b have the same structure and are non-bending tabs 911'. This is designed to achieve electrical connection between the cells. The structure of the bent tab 911 is the same as that of the tab 21 shown in fig. 1, that is, the bent tab 911 includes a first portion extending from the battery cell (for example, extending toward the Z direction in fig. 2A) and a second portion bent with respect to the first portion, and an included angle between the second portion and the first portion is, for example, 90 °, which is advantageous for welding the second portions of two adjacent tabs. The non-bending tab 911' includes a first portion extending from the battery cell, i.e., a straight plate-shaped tab.

In some embodiments, as shown in fig. 3B, for the cell unit I and the cell unit III, the bent tabs 911 of two adjacent cells are in a similar manner to the manner in which two adjacent tabs in fig. 2A are in direct contact, specifically, in the same group of cells 91, the polarities are the same, and the bending directions of two adjacent bent tabs 911 are the same and overlap each other. Here, adjacent two bent tabs 911 have portions overlapping each other in the X direction. Of course, in practical application, the bending directions of the two adjacent bending tabs 911 may be opposite or form an included angle, and the two adjacent bending tabs 911 are not limited to overlap each other in the X direction, in practical application, the two adjacent bending tabs 911 may overlap each other in any direction in the three-dimensional space, and the overlapping sequence of the two adjacent bending tabs 911 may be adjusted arbitrarily, for example, in the X direction, for the two adjacent bending tabs 911, wherein any one bending tab 911 may be located at the left side of the other bending tab 911.

In this embodiment, for each cell unit, the polarities of the same side tabs of two adjacent cells in the same cell group 91 are the same, so as to achieve parallel connection of two adjacent cells in the same cell group 91. Of course, the embodiment of the present utility model is not limited thereto, and in practical application, two adjacent cells in the same cell group 91 may be connected in series or in series-parallel.

In some embodiments, as shown in fig. 3B, for the cell unit I and the cell unit III, the bent tabs 911 of the cells in different cell groups 91 are located on the same side of the cell, and in each adjacent two cell groups 91, the bent tabs 911 of the cells in one cell group 91 are opposite to the bent tabs 911 of the cells in the other cell group, and overlap each other, so as to achieve the series connection of the adjacent two cell groups. For example, as shown in fig. 3B, in the Z direction, the bent tabs 911 of the plurality of cells in the uppermost and lowermost cell groups 91 are all negative electrode tabs (as shown by the minus sign "-" in fig. 3B), the bent tabs 911 of the plurality of cells in the intermediate cell group 91 are all positive electrode tabs (as shown by the plus sign "+" in fig. 3B), and the bent tabs 911 of the uppermost and intermediate cell groups 91 are sequentially overlapped to realize the series connection of the uppermost and intermediate cell groups 91. Of course, in practical application, for two adjacent cell groups, the bent tabs 911 of the cells in the different cell groups 91 may be located on different sides of the cells according to different electrical connection manners. In addition, two adjacent cell groups can be connected in parallel or in series-parallel.

In some embodiments, for the cell unit I and the cell unit III, taking the cell unit I shown in fig. 3C as an example, the non-bending tabs 911 'of the respective cells 91a in each group of the cell groups 91 are overlapped with the non-bending tabs 911' on the same side of the respective cells 91b in each group of the cell groups 91 in the cell unit II in a one-to-one correspondence manner, so as to realize electrical connection between the cell units.

In some embodiments, as shown in fig. 3C, for the cell unit I, the non-bent tab 911' of each cell 91a in the uppermost cell group 91 is a positive electrode tab, the non-bent tab 911' of each cell 91a in the middle cell group 91 is a negative electrode tab, and the non-bent tab 911' of each cell 91a in the lowermost cell group 91 is a positive electrode tab. For the cell unit III, the non-bent tabs 911' of the cells 91c in the uppermost cell group 91 are all negative electrode tabs, the non-bent tabs 911' of the cells 91c in the middle cell group 91 are all positive electrode tabs, and the non-bent tabs 911' of the cells 91c in the lowermost cell group 91 are all negative electrode tabs. For the cell unit II, the non-bent tabs 911' of the cells 91b in the uppermost cell group 91 are all negative electrode tabs, the non-bent tabs 911' of the cells 91b in the middle cell group 91 are all positive electrode tabs, and the non-bent tabs 911' of the cells 91b in the lowermost cell group 91 are all negative electrode tabs. In addition, the polarity of each non-bending tab 911 'in the battery cell unit I is opposite to that of each non-bending tab 911' on the same side in the battery cell unit II, and the non-bending tabs are electrically connected; likewise, each non-bending tab 911 'in the cell unit III is opposite in polarity to each non-bending tab 911' on the same side in the cell unit II, and is electrically connected, so that the series connection between two adjacent cell units is realized. Of course, in practical application, two adjacent battery cells can be connected in parallel or in series-parallel.

In this modified embodiment, for the cell unit I and the cell unit III, the two tabs of each cell have different structures, namely, a bent tab 911 and a non-bent tab 911'; for the cell unit II, the two tabs of each cell 91b have the same structure and are non-bending tabs 911'. However, the embodiment of the present utility model is not limited to this, and in practical application, for the cell unit I, the cell power supply II, and the cell unit III, two tabs of each cell may be bent tabs 911, which may also utilize lap joint or other contact modes of two adjacent bent tabs 911 to achieve electrical connection between two adjacent cell units.

As another modification of the present embodiment, please refer to fig. 3D, the present modification provides a battery cell module 9', which is different from the above modification only in that: there is only one cell unit including a plurality of cell groups 91 'stacked in sequence in the Z direction, each of the cell groups 91' including a plurality of cells stacked in sequence in the Z direction. For example, fig. 3D shows that the cell unit includes three groups of cell groups 91' stacked in sequence in the Z direction, each group of cell groups 91' including three cells (91 a ',91b ',91c ') stacked in sequence in the Z direction.

And each battery cell is provided with two electrode lugs, namely a negative electrode lug and a positive electrode lug, which are respectively positioned on two opposite sides of the battery cell. The tabs of every two adjacent cells are electrically connected in a direct contact manner, wherein the tabs of every two adjacent cells can be in the same group of cells or between two adjacent groups of cells so as to realize the electrical connection of a plurality of cells in the same group of cells and the electrical connection between different groups of cells. The electrical connection may be parallel, serial or parallel.

In some embodiments, as shown in fig. 3D, the two tabs of each cell are bent tabs 911, and the structure of the bent tabs 911 is the same as that of the tab 21 shown in fig. 1, that is, the bent tabs 911 each include a first portion extending from the same side of the cell (e.g., extending in the Z direction in fig. 2A) and a second portion bent with respect to the first portion, and an angle between the second portion and the first portion is, for example, 90 °, which is advantageous for welding the second portions of the two adjacent tabs. And, the bending direction of two lugs of each electric core is opposite. Of course, in practical application, the bending directions of the two tabs of each cell can be the same according to different requirements.

In some embodiments, as shown in fig. 3D, the manner of direct contact of the bent tabs 911 of two adjacent cells is similar to the manner of direct contact of the two adjacent tabs in fig. 2A, specifically, in the same group of cells 91', the polarities are the same, and the bending directions of the two adjacent bent tabs 911 are the same and overlap each other. Here, adjacent two bent tabs 911 have portions overlapping each other in the X direction. Of course, in practical application, the bending directions of the two adjacent bending tabs 911 may be opposite or form an included angle, and the two adjacent bending tabs 911 are not limited to overlap each other in the X direction, in practical application, the two adjacent bending tabs 911 may overlap each other in any direction in the three-dimensional space, and the overlapping sequence of the two adjacent bending tabs 911 may be adjusted arbitrarily, for example, in the X direction, for the two adjacent bending tabs 911, wherein any one bending tab 911 may be located at the left side of the other bending tab 911.

In this embodiment, in the same cell group 91', the polarities of the same side tabs of two adjacent cells are the same, so as to achieve parallel connection of two adjacent cells in the same cell group 91. Of course, the embodiment of the present utility model is not limited thereto, and in practical application, two adjacent cells in the same cell group 91' may be connected in series or in series-parallel.

In some embodiments, as shown in fig. 3D, in each two adjacent groups of cells 91', the bent tabs 911 of the multiple cells in one group of cells 91' are opposite to the bent tabs 911 of the multiple cells in the other group of cells 91' on the same side and overlap each other to achieve the series connection of the two adjacent groups of cells. For example, as shown in fig. 3D, in the Z direction, the left bent tabs 911 of the plurality of cells in the uppermost and lowermost cell groups 91' are positive tabs (as shown by minus signs "-" in fig. 3D), and the right bent tabs 911 are negative tabs (as shown by plus signs "+" in fig. 3D); the left bending lugs 911 of the multiple cells in the cell group 91' of the middle layer are all negative lugs, and the right bending lugs 911 are all positive lugs. Wherein, between the battery cell group 91 'of the lowest layer and intermediate layer, the adjacent negative pole tab that is located the left side overlap joint each other with anodal utmost point ear, between the battery cell group 91' of the highest layer and intermediate layer, the adjacent negative pole tab that is located the right side overlap joint each other with anodal utmost point ear to realize three group's battery cell group 91' series connection in proper order. Of course, in practical application, according to different electrical connection manners, in each two adjacent groups of the battery cell groups 91', the bent tabs 911 of the plurality of battery cells in one group of the battery cell groups 91' and the bent tabs 911 of the plurality of battery cells in the other group of the battery cell groups 91' located on the same side can be made to have the same electrical property and overlap with each other, so as to realize parallel connection of the two adjacent battery cell groups. In addition, two adjacent cell groups can be connected in series.

As yet another modification of the present embodiment, please refer to fig. 3E, the present modification provides a cell module 9″ which differs from the above modification shown in fig. 3D only in that: the polarities and overlapping modes of two adjacent lugs are different. Specifically, the present modified embodiment provides a cell module 9 "having only one cell unit including a plurality of groups of cell modules 91" stacked in sequence in the Z direction, each group of cell modules 91 "including a plurality of cells stacked in sequence in the Z direction. For example, fig. 3E shows that the cell unit includes three groups of cell groups 91″ stacked in sequence in the Z direction, each group of cell groups 91″ including three cells (91 a ",91b",91c ") stacked in sequence in the Z direction.

In some embodiments, as shown in fig. 3E, two tabs of each cell are bent tabs 911, and the structure of the bent tabs 911 is the same as that of the tab shown in fig. 2C, that is, the bent tabs 911 each include a first portion extending from the same side of the cell (e.g., extending in the Z direction in fig. 2A) and a second portion bent with respect to the first portion, and an angle between the second portion and the first portion is, for example, 90 °, which is advantageous for welding the second portions of two adjacent tabs. And, the bending direction of two lugs of each electric core is opposite. Of course, in practical application, the bending directions of the two tabs of each cell can be the same according to different requirements.

In some embodiments, as shown in fig. 3E, the bent tabs 911 of two adjacent cells are in direct contact similar to the direct contact of two adjacent tabs in fig. 2C, specifically, in the same group of cells 91", the polarities are opposite, and the bending directions of the two adjacent bent tabs 911 are opposite and overlap each other. Here, adjacent two bent tabs 911 have portions overlapping each other in the X direction. Of course, in practical application, the bending directions of the two adjacent bending tabs 911 may be opposite or form an included angle, and the two adjacent bending tabs 911 are not limited to overlap each other in the X direction, in practical application, the two adjacent bending tabs 911 may overlap each other in any direction in the three-dimensional space, and the overlapping sequence of the two adjacent bending tabs 911 may be adjusted arbitrarily, for example, in the X direction, for the two adjacent bending tabs 911, wherein any one bending tab 911 may be located at the left side of the other bending tab 911.

It should be noted that, the electrical connection manner between the plurality of electric cores in the same electric core group may be various, and is not limited to the serial manner adopted in the present modified embodiment, and may be parallel connection or series-parallel connection. The electrical connection manner between the different cell groups may be various, but is not limited to the serial connection adopted in the embodiment, and may be parallel connection or series-parallel connection.

As another technical solution, an embodiment of the present utility model further provides a battery cell assembly, which includes the above battery cell module provided by the embodiment of the present utility model.

The embodiment of the utility model also provides a battery cell assembly, which not only can realize the electric connection of a plurality of battery cells and ensure the satisfaction of the current carrying requirement, but also can avoid the use of a busbar by adopting the battery cell module provided by the embodiment of the utility model, thereby reducing the volume of the battery cell module, simplifying the manufacturing process of the module, improving the production efficiency and reducing the manufacturing cost of the battery cells.

In some embodiments, the plurality of cell modules are stacked in sequence, and a fire-proof sheet is arranged between two adjacent cell modules. The cell module is likely to generate fire, and when the cell module generates fire, the fireproof sheet plays a positive role in preventing the fire from spreading.

As another technical solution, an embodiment of the present utility model further provides a method for connecting a battery cell module, where the method for connecting a battery cell module provided by the embodiment of the present utility model includes:

the lugs of every two adjacent electric cores are electrically connected in a direct contact mode, so that the electric connection of a plurality of electric cores is realized.

According to the connection method of the battery core module, provided by the embodiment of the utility model, through adopting a direct contact mode to electrically connect the lugs of every two adjacent battery cores, not only can the electric connection of a plurality of battery cores be realized, but also the current carrying requirement can be met, and a busbar can be omitted, so that the volume of the battery core module can be reduced, the manufacturing process of the module is simplified, the production efficiency can be improved, and the manufacturing cost of the battery core is reduced.

In some embodiments, the tabs of each adjacent two cells are electrically connected by laser welding.

The mode of laser welding can enable the connection of the lugs of every two adjacent battery cells to be relatively tight, so that the service life of the battery cell module can be prolonged.

In some embodiments, as shown in fig. 1 and 2A, each tab 21 includes a first portion 211 extending from the same side of the cell (e.g., extending in the Z direction in fig. 2A) and a second portion 212 bent relative to the first portion 211. In this case, the tab of each adjacent two cells is electrically connected by means of laser welding, comprising the following steps:

S1, providing a laser welding tool;

the laser welding tool comprises a laser tool component, wherein the laser tool component is positioned on one side of the second part 212 of the tab, which is close to the battery cell, and is used for supporting the second part 212 and protecting the second part 212 and a part positioned on one side of the second part 212, which is close to the battery cell;

and S2, welding the second parts 212 of every two adjacent tabs 21 from the side, far from the battery cells, of the second parts 212 by using laser.

By means of the laser welding tool, when the second portion 212 of the tab 21 which is overlapped together is laser welded, the laser energy can be controlled within a safe range, so that the second portion 212 can be prevented from being deformed due to overhigh temperature after being penetrated by laser, and the first portion 211 and the battery cell below the second portion 212 are protected from being irradiated by the laser.

As another technical solution, an embodiment of the present utility model further provides a laser welding tool, which is used for assisting in electrically connecting the tabs of each two adjacent cells in a laser welding manner, taking the tabs of the cells shown in fig. 1 and 2A as an example, each tab 21 includes a first portion 211 extending from the same side of the cell and a second portion 212 bent relative to the first portion 211; the second portions 212 of the tabs 21 of every two adjacent cells have the same bending direction and overlap each other.

The laser welding tool comprises a laser tool component, wherein the laser tool component is used for being positioned on one side, close to the battery cell, of the second part of the tab during laser welding so as to support the second part and protect the second part and a part positioned on one side, close to the battery cell, of the second part.

According to the laser welding tool provided by the embodiment of the utility model, through adopting the direct contact mode to electrically connect the lugs of every two adjacent electric cores, the electric connection of a plurality of electric cores can be realized, the current carrying requirement is met, and the busbar is not required, so that the volume of an electric core module can be reduced, the manufacturing process of the module is simplified, the production efficiency is improved, and the manufacturing cost of the electric cores is reduced.

The above-mentioned laser fixture assembly may have various structures, for example, as shown in fig. 4, the laser fixture assembly 3 includes a first laser fixture 31 and a second laser fixture 32, the first laser fixture 31 and the second laser fixture 32 are located on a side, close to the battery core, of the second portion 212 during laser welding, and the second laser fixture 32 is located on a side, far away from the battery core, of the first laser fixture 31 (i.e., in fig. 4, the second laser fixture 32 is located above the first laser fixture 31), and slots 33 through which the first portions of the electrodes pass are provided in the first laser fixture 31 and the second laser fixture 32, and the slots 33 may also play a role in defining the positions of the tabs to ensure welding accuracy.

The first laser fixture 31 is used for absorbing laser energy, so that the laser energy can be controlled within a safe range through heat dissipation, and the second portion 212 can be ensured not to deform due to overhigh temperature after being penetrated by laser; the second laser fixture 32 is used for supporting the second portion 212, and is made of a material that transmits laser light, so that the laser light can pass through the second laser fixture 32 and irradiate onto the first laser fixture 31. In addition, the second laser fixture 32 is further used for isolating the second portion 212 of the tab from the first laser fixture 31, so as to avoid welding the two.

In some embodiments, the materials used for the second laser fixture 32 include borosilicate glass, and the borosilicate glass has a melting temperature higher than that of the silicate glass, so that the second laser fixture 32 is prevented from being damaged due to an excessively high welding temperature, and the light-transmitting performance is high, so that the laser can be effectively transmitted.

In some embodiments, the material used for the first laser fixture 31 includes a material with a better heat conducting property, such as stainless steel or graphite, so as to avoid the deformation of the cell module 1 due to the heat generated by welding.

In some embodiments, the first laser fixture 31 includes a first sub-fixture 311 and a second sub-fixture 312, the second laser fixture 32 includes a third sub-fixture 321 and a fourth sub-fixture 322, and the third sub-fixture 321 and the fourth sub-fixture 322 are respectively disposed corresponding to the first sub-fixture 311 and the second sub-fixture 312, that is, the third sub-fixture 321 is correspondingly disposed above the first sub-fixture 311, and the fourth sub-fixture 322 is correspondingly disposed above the second sub-fixture 312.

The slot 33 includes a first sub-slot 331 disposed on the first sub-jig 311 and the second sub-jig 312, and a second sub-slot 332 disposed on the third sub-jig 321 and the fourth sub-jig 322, respectively. The first sub-slot 331 and the second sub-slot 332 each have an opening in the Y direction in fig. 4 for the first portion of the tab to move in or out.

In this embodiment, the laser welding fixture further includes a first auxiliary assembly and a second auxiliary assembly, both of which adopt a moving structure 6 as shown in fig. 4, and the moving structure 6 may have various structures, for example, including a moving plate 61 and a moving shaft 62 connected thereto, wherein the moving plate 61 is vertically disposed along the Z direction, and the two moving plates 61 are oppositely disposed along the Y direction. The two moving plates 61 can be moved closer to or farther from each other by manually or automatically driving the moving shaft 62 to move in the Y direction. In addition, the first sub-jig 311, the second sub-jig 312, the third sub-jig 321 and the fourth sub-jig 322 are fixedly connected with the corresponding moving plate 6 through screws.

As a way of automatically driving the moving shaft 62 to move in the Y direction, the moving shaft 62 may be connected to a linear driving source such as a linear hydraulic cylinder, a linear motor, or the like.

The moving structure 6 of the first auxiliary assembly is used for driving the first sub-jig 311 and the third sub-jig 321 which are all located at the left side of fig. 4 to move synchronously, and the moving structure 6 of the second auxiliary assembly is used for driving the second sub-jig 312 and the fourth sub-jig 322 which are all located at the right side of fig. 4 to move synchronously, so that the first sub-jig 311 and the second sub-jig 312 are butted or separated from each other, and meanwhile, the third sub-jig 321 and the fourth sub-jig 322 are butted or separated from each other. Fig. 5A shows a first state in which the first sub-jig 311 and the second sub-jig 312 are separated from each other, and the third sub-jig 321 and the fourth sub-jig 322 are separated from each other, at which time the cell module 1 can be taken and placed; fig. 5B shows a second state in which the first sub-jig 311 and the second sub-jig 312 are butted against each other, and the third sub-jig 321 and the fourth sub-jig 322 are butted against each other, at which time laser welding is possible.

In addition, in the process of mutually butting or separating the first sub-jig 311 and the second sub-jig 312, the first part of the corresponding tab moves into or moves out of the first sub-slot 331; the third sub-fixture 321 and the fourth sub-fixture 322 move in or out of the second sub-slot 332 during the process of mutually abutting or separating the first parts of the corresponding tabs.

By dividing the first laser jig 31 and the second laser jig 32 into two sub-jigs, and driving the corresponding two sub-jigs to be in butt joint or separation by using the moving structure 6, the electrode lugs can be more conveniently and accurately welded by laser.

In some embodiments, the laser welding fixture further includes a bottom plate 4, the battery cell module 1 is disposed on the bottom plate 4, and a guide rail 41 is disposed on the bottom plate 4, and an extending direction (i.e., a Y direction) of the guide rail 41 is perpendicular to a stacking direction (i.e., an X direction) of the plurality of battery cells; the first auxiliary assembly and the second auxiliary assembly (for example, the moving plate 61) are provided with sliding structures (not shown) slidably engaged with the guide rails, and the sliding structures are used for driving the first auxiliary assembly and the second auxiliary assembly to slide along the guide rails 41. The sliding structure is for example a chute which is in sliding fit with the guide rail 4. By means of the guide rail 41 and the sliding structure, the first auxiliary assembly and the second auxiliary assembly can be guided, so that welding precision can be further improved, and meanwhile, the first part of the tab can be ensured to be accurately moved into the corresponding sub slot.

In some embodiments, two clamping plates (51, 52) are further disposed on the bottom plate 4 between the first auxiliary assembly and the second auxiliary assembly (i.e., the two moving plates 61), and the two clamping plates (51, 52) are disposed opposite to each other in the stacking direction (i.e., the X direction) of the plurality of cells for clamping the cell module 1 therebetween.

In some embodiments, as shown in fig. 4, the upper end of the clamping plate 51 is provided with a taking groove 511, and correspondingly, the upper end of the clamping plate 52 is also provided with a taking groove (not shown in the figure) so as to conveniently take out the battery cell module 1 from between the two clamping plates (51, 52).

In some embodiments, as shown in fig. 6, two butting surfaces of the first sub-jig 311 and the second sub-jig 312 are respectively provided with a convex portion 311a and a concave portion 312a, which are matched with each other, so as to define the butting positions of the first sub-jig 311 and the second sub-jig 312, and ensure welding accuracy.

When the laser welding tool is used for carrying out laser welding on the battery cell module 1, the connection method of the battery cell module comprises the following steps:

step 1, placing the battery cell module 1 between two clamping plates (51, 52);

step 2, controlling the two moving shafts 62 to respectively push the two moving plates 62 to move towards the direction approaching to each other, in the process, the two moving plates 62 respectively drive the first sub-jig 311 and the third sub-jig 321 and the second sub-jig 312 and the fourth sub-jig 322 to synchronously move until the first sub-jig 311 and the second sub-jig 312 are butted with each other and the third sub-jig 321 and the fourth sub-jig 322 are butted with each other; during docking, a first portion of tab 21 enters a corresponding sub-slot.

As shown in fig. 5B, after the butt joint is completed, the second portion 212 of the tab, the second laser jig 32, and the first laser jig 31 are sequentially disposed from top to bottom.

Step 3, welding the overlapped second parts 212 of the tabs from top to bottom by using laser;

step 4, after the laser welding is completed, controlling the two moving shafts 62 to respectively push the two moving plates 62 to move in a direction away from each other, in this process, the two moving plates 62 respectively drive the first sub-jig 311 and the third sub-jig 321 and the second sub-jig 312 and the fourth sub-jig 322 to synchronously move until the first sub-jig 311 and the second sub-jig 312 are separated from each other, and the third sub-jig 321 and the fourth sub-jig 322 are separated from each other; after the separation process is completed, the cell module 1 is taken out through the take-out groove 511.

And repeating the steps 1-5 to finish the laser welding of the battery cell module 1.

The above-mentioned laser fixture assembly may also have other structures, for example, as shown in fig. 7, the laser fixture assembly 7 includes a first laser fixture 71 and a second laser fixture 72, where the first laser fixture 71 is located on a side of the second portion 212 of the tab, which is close to the battery cell, and a slot 74 through which the first portion 212 passes is provided, and the slot 74 may also play a role in defining the position of the tab, so as to ensure welding accuracy. The first laser fixture 71 is used for supporting the second portion 212 of the tab, and can also play a role in heat dissipation on the second portion 212 of the tab. The first laser jig 71 is further provided with a laser avoiding groove 75, and the laser avoiding groove 75 is used for preventing laser from directly irradiating on the plane of the first laser jig 71 to generate a frying point, so that the welding safety can be improved. The depth of the laser escape groove 75 is, for example, 2mm or more.

The second laser fixture 72 is located at one side of the second portion 212 of the tab, which is far away from the battery cell, and is used for pressing the second portion 212, and can also play a role in heat dissipation of the second portion 212 of the tab. A through groove 73 through which the laser beam passes is provided in the second laser jig 72 at a position corresponding to each second portion 212.

The first laser jig 71 and the second laser jig 72 can control the laser energy within a safe range through heat dissipation, so that the second portion 212 can be ensured not to deform due to overhigh temperature after being penetrated by laser.

In some embodiments, the first laser fixture 71 includes a first sub-fixture 711 and a second sub-fixture 712, the second laser fixture 72 includes a third sub-fixture 721 and a fourth sub-fixture 722, and the third sub-fixture 721 and the fourth sub-fixture 722 are respectively disposed corresponding to the first sub-fixture 711 and the second sub-fixture 712, i.e. the third sub-fixture 721 is correspondingly located above the first sub-fixture 711, and the fourth sub-fixture 722 is correspondingly located above the second sub-fixture 712.

The slot 74 includes sub-slots respectively provided on the first sub-jig 711 and the second sub-jig 712. The sub-slot has an opening in the Y direction in fig. 7 for the first portion of the tab to move in or out.

In addition, the laser welding tool further includes a first auxiliary assembly and a second auxiliary assembly, both of which adopt a moving structure 6 shown in fig. 7, and the moving structure 6 is the same as the moving structure 6 shown in fig. 4, and is not described in detail herein since it has been described in the foregoing. The first sub-jig 711, the second sub-jig 712, the third sub-jig 721, and the fourth sub-jig 722 are fixedly connected with the corresponding moving plate 6 by screws.

The moving structure 6 of the first auxiliary component is used for driving the first sub-jig 711 and the third sub-jig 721 which are all located at the left side of fig. 7 to move synchronously, and the moving structure 6 of the second auxiliary component is used for driving the second sub-jig 712 and the fourth sub-jig 722 which are all located at the right side of fig. 7 to move synchronously, so that the first sub-jig 711 and the second sub-jig 712 are close to or separated from each other, and meanwhile, the third sub-jig 721 and the fourth sub-jig 722 are close to or separated from each other. Fig. 8A shows a state in which the third sub-jig 721 and the fourth sub-jig 722 are close to each other, and fig. 8B shows a state in which the first sub-jig 711 and the second sub-jig 712 are close to each other, at which time laser welding can be performed.

And, the first sub-jig 711 and the second sub-jig 712 move in or out of the sub-slots of the slot 74 during the process of approaching or separating each other, respectively, the first portions of the corresponding tabs.

By dividing the first laser jig 71 and the second laser jig 72 into two sub-jigs, and driving the corresponding two sub-jigs to be in butt joint or separation by using the moving structure 6, the tab can be more conveniently and accurately welded by laser.

In some embodiments, the laser fixture assembly 7 further comprises a support cooling mechanism connected to the first laser fixture 71, and the second laser fixture 72 is connected to the first laser fixture 71; the support cooling mechanism is used for supporting and cooling the second laser jig 72 and the first laser jig 71. By means of the supporting and cooling mechanism, the heat of the second portion of the tab can be further reduced, and therefore the second portion 212 can be effectively prevented from being deformed due to overhigh temperature after being penetrated by laser. Moreover, for the case where the first laser jig 71 includes the first sub-jig 711 and the second sub-jig 712, the above-described support cooling mechanism includes the first support cooling member 81 and the second support cooling member 82, which are fixedly connected with the two moving plates 61, respectively, and a passage for conveying cooling water is provided in each support cooling member for cooling.

In addition, the structures of the other components such as the base plate 4, the two clamping plates (51, 52) and the like shown in fig. 7 are the same as the corresponding components shown in fig. 4, and are not described again here.

In summary, according to the technical scheme of the cell module, the connection method thereof, the cell assembly and the laser welding tool provided by the embodiment of the utility model, through adopting the direct contact mode to electrically connect the lugs of every two adjacent cells, not only can the electric connection of a plurality of cells be realized, but also the current carrying requirement can be met, and the busbar can be omitted, so that the volume of the cell module can be reduced, the manufacturing process of the module can be simplified, the production efficiency can be improved, and the manufacturing cost of the cell can be reduced.

The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited thereto. The technical solution of the utility model can be subjected to a plurality of simple variants within the scope of the technical idea of the utility model. Including the various specific features being combined in any suitable manner. The various possible combinations of the utility model are not described in detail in order to avoid unnecessary repetition. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.

Claims

1. The battery cell module is characterized by comprising at least one group of battery cell groups, wherein each group of battery cell groups comprises a plurality of stacked battery cells, and two battery lugs of each battery cell are respectively a positive electrode lug and a negative electrode lug;

2. The cell module of claim 1, wherein the second portions of the tabs of two adjacent cells are partially staggered in a direction perpendicular to the stacking direction of the plurality of cells.

3. The cell module according to claim 1 or 2, wherein the tabs of each adjacent two of the cells are connected by laser welding.

4. The battery cell module according to claim 1 or 2, wherein the battery cell groups are plural groups, and plural groups of the battery cell groups are arranged along a stacking direction of plural battery cells;

in each two adjacent battery cell groups, the positive electrode lugs of the battery cells in one battery cell group are electrically connected with the negative electrode lugs of a plurality of battery cells in the other battery cell group, so that the two adjacent battery cell groups are connected in series; or, the positive electrode lugs of the electric cores in the two adjacent electric core groups are electrically connected, and the negative electrode lugs of the electric cores in the two adjacent electric core groups are electrically connected, so that the parallel connection of the two adjacent electric core groups is realized.

5. The battery cell module of claim 1, wherein the battery cells have two tabs, a positive tab and a negative tab, respectively, and are located on opposite sides of the battery cells, respectively, and wherein a first tab of the two tabs of each battery cell comprises a first portion extending from the battery cell and a second portion bent with respect to the first portion, and a second tab of the two tabs of each battery cell comprises a first portion extending from the battery cell; wherein the second parts of the first tabs of each two adjacent cells overlap each other or the first parts of the second tabs of each two adjacent cells overlap each other;

6. A battery cell assembly comprising the battery cell module of any one of claims 1-5.

7. The cell assembly of claim 6, wherein the plurality of cell modules are provided with fire-blocking sheets between two adjacent cell modules.

8. The utility model provides a laser welding frock, its characterized in that, laser welding frock is used for assisting to adopt the mode of laser welding to connect the utmost point ear electricity of every adjacent two electric core, every utmost point ear all includes the first part that extends from electric core extension identity side and the second part of buckling relative to first part; the second parts of the lugs of every two adjacent battery cells are identical in bending direction and are mutually overlapped;

9. The laser welding tool according to claim 8, wherein the laser jig assembly comprises a first laser jig and a second laser jig, the first laser jig and the second laser jig are both positioned on one side of the second portion, which is close to the battery cell, and the second laser jig is positioned on one side of the first laser jig, which is far away from the battery cell, and slots for the first portion to pass through are formed in the first laser jig and the second laser jig; wherein, the liquid crystal display device comprises a liquid crystal display device,

the first laser jig is used for absorbing laser energy;

10. The laser welding tool of claim 9, wherein the first laser fixture comprises a first sub-fixture and a second sub-fixture, the second laser fixture comprises a third sub-fixture and a fourth sub-fixture, and the second sub-fixture and the third sub-fixture are respectively arranged corresponding to the first sub-fixture and the second sub-fixture;

11. The laser welding fixture of claim 8, wherein the laser fixture assembly comprises a first laser fixture and a second laser fixture, wherein,

12. The laser welding tool of claim 11, wherein the first laser fixture comprises a first sub-fixture and a second sub-fixture, the second laser fixture comprises a third sub-fixture and a fourth sub-fixture, and the second sub-fixture and the third sub-fixture are respectively arranged corresponding to the first sub-fixture and the second sub-fixture;

13. The laser welding tool according to claim 10 or 12, further comprising a bottom plate, wherein the cell module is disposed on the bottom plate, and a guide rail is disposed on the bottom plate, and an extending direction of the guide rail is perpendicular to a stacking direction of the plurality of cells; the first auxiliary assembly and the second auxiliary assembly are respectively provided with a sliding structure in sliding fit with the guide rail, and the sliding structures are used for driving the first auxiliary assembly and the second auxiliary assembly to slide along the guide rail.

14. The laser welding fixture of claim 13, further comprising two clamping plates on the base plate and between the first and second auxiliary assemblies, the two clamping plates being disposed opposite each other in a stacking direction of the plurality of cells for clamping the cell module therebetween.

15. The laser welding fixture of claim 11, wherein the laser fixture assembly further comprises a support cooling mechanism, the support cooling mechanism being connected to the first laser fixture, the second laser fixture being connected to the first laser fixture; the support cooling mechanism is used for supporting the second laser jig and the first laser jig and cooling the second laser jig and the first laser jig.