CN219498101U - Square shell cell and battery module - Google Patents

Abstract

The utility model provides a square shell battery cell and a battery module, wherein the square shell battery cell comprises: the battery cell comprises a battery cell body, a first pole and a second pole, wherein the first pole and the second pole are arranged on the end face of the battery cell body, an electric plug-in extension part is arranged on the first pole, an electric plug-in groove is arranged on the second pole, and the shape of the electric plug-in groove is matched with the shape of the electric plug-in extension part. When a plurality of square shell electric cores are assembled into a battery module, electric plug connection is realized between adjacent square shell electric cores through corresponding electric plug connection extension parts and electric plug connection grooves. By arranging the electric plug grooves and the electric plug extension parts with the shapes being matched on the two poles of the square shell battery core respectively, various problems are solved when the two adjacent battery cores are connected through welding or screwing processes. The connection mode between the battery cells is obviously optimized, and the assembly efficiency of the battery module is greatly improved.

Description

Square shell cell and battery module

Technical Field

The utility model relates to the technical field of batteries, in particular to a square shell battery cell and a battery module.

Background

Under the development of new energy automobile flame, the power battery requirement is greatly improved, the production cost and the battery safety become important points of attention of an automobile enterprise and a battery enterprise, and therefore the cost reduction and the improvement of the production efficiency become urgent requirements of enterprise development. The existing design scheme of electric connection of the module and the battery pack comprises two types of screw connection and welding, wherein a bus bar is fixed on a battery core electrode column through a screw connection finger, and a welding finger welds the bus bar on the electrode column through welding. However, the screw connection increases the kinds of materials and the production man-hour, and the weight of the system is also increased. And welding can take place risks such as weld penetration, rosin joint, and the welding slag of production also can influence the security performance of whole battery package, because a plurality of solder joints are required to production efficiency has been reduced. Therefore, it is desirable to provide a square battery cell and a battery module.

Disclosure of Invention

In view of the above drawbacks of the prior art, the present utility model is directed to a square-case battery cell and a battery module, so as to solve the problem that in the prior art, when two adjacent battery cells are connected by welding or screwing, welding failure is likely to occur or the overall weight is increased.

To achieve the above and other related objects, the present utility model provides a square-case cell, comprising: the battery cell body is provided with a first pole and a second pole which are arranged on the end face of the battery cell body;

wherein, be provided with electric grafting extension on the first utmost point post, be provided with electric grafting groove on the second utmost point post, and electric grafting groove's shape and electric grafting extension's shape looks adaptation.

In an embodiment of the utility model, the first pole and the second pole are respectively disposed on the same end face or two opposite end faces of the battery core body.

In one embodiment of the utility model, the electrical plug extension is a sheet-like or cylindrical structure.

In one embodiment of the utility model, the electrical plug extension and the electrical plug slot extend in a thickness direction of the cell body.

In one embodiment of the utility model, the electrical plug slot is a blind slot.

In one embodiment of the utility model, the electrical socket is interference-fit with the electrical socket extension.

In an embodiment of the utility model, a plug guide structure is provided between the electrical plug slot and the electrical plug extension.

In an embodiment of the present utility model, there is further provided a battery module, including a frame, and further including at least two square-case cells as set forth in any one of the above, at least two square-case cells being stacked in the frame, and adjacent square-case cells being electrically plugged with each other through the corresponding electrical plug extension and the electrical plug slot.

In an embodiment of the utility model, the plugging direction of the electrical plug extension and the electrical plug slot corresponds to the stacking direction of the square-housing cells.

In an embodiment of the present utility model, the first electrode and the second electrode are respectively disposed on the same end face of the battery core body, and the first electrode and the second electrode on two adjacent battery cores are alternately arranged along the stacking direction of the battery cores.

In summary, the present utility model provides a square-case battery cell and a battery module, wherein a first pole and a second pole are respectively disposed on an end face of a battery cell body, an electrical plug extension is disposed on the first pole, and an electrical plug slot is disposed on the second pole, wherein a shape of the electrical plug extension and a shape of the electrical plug slot are adapted to achieve electrical plug of an adjacent square-case battery cell. When a plurality of square shell electric cores are assembled into a battery module, the electric connection of two adjacent square shell electric cores is realized by inserting the electric plug extension part of the previous square shell electric core into the electric plug groove of the next square shell electric core. Therefore, the problem that welding slag can cause the failure of the battery core or increase the overall weight when two square-shell battery cores are connected in a welding or screwing mode in the prior art is effectively avoided. The mode that this application described no longer adopts welding or spiro union, has promoted production efficiency, has optimized the connected mode between the electric core, has greatly promoted battery module's packaging efficiency.

Drawings

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

FIG. 1 is a schematic diagram showing the structure of the inter-cell connection according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of two poles on the same side of a battery cell according to an embodiment of the present utility model;

FIG. 3 is a schematic view showing the structure of two poles on opposite sides of a battery cell according to an embodiment of the present utility model;

FIG. 4 is a schematic view showing the structure of the connection of the pole and the electrical plug extension according to an embodiment of the present utility model;

FIG. 5 is a cross-sectional view of a second post interposer lead structure and electrical socket connection in accordance with one embodiment of the present utility model;

fig. 6 is a schematic view illustrating a structure of a battery module according to an embodiment of the utility model.

Description of element numbers:

100. a cell body; 110. an end cap; 120. a housing; 200. a first pole; 210. an electrical plug extension; 220. a lead angle; 300. a second post; 310. an electrical socket; 320. a guide groove; 400. an explosion-proof valve; 500. a frame; 510. a bottom of the frame.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the utility model is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the utility model. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.

Please refer to fig. 1 to 6. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the utility model, are included in the spirit and scope of the utility model which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

Where numerical ranges are provided in the examples, it is understood that unless otherwise stated herein, both endpoints of each numerical range and any number between the two endpoints are significant both in the numerical range. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs and to which this utility model belongs, and any method, apparatus, or material of the prior art similar or equivalent to the methods, apparatus, or materials described in the examples of this utility model may be used to practice the utility model.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a connection between cells according to an embodiment of the utility model. The utility model provides a square shell battery cell and a battery module. On the end face of the cell body 100, a first pole 200 and a second pole 300 are provided, and the polarities of the first pole 200 and the second pole 300 are opposite. Furthermore, an electrical plug extension 210 extending outwards is provided on the first pole 200, an electrical plug slot 310 is provided on the second pole 300, and the shape of the electrical plug slot 310 is adapted to the shape of the electrical plug extension 210. When the battery module is assembled, a plurality of square-case cells are stacked on each other, and the electrical plug extension 210 of the previous square-case cell is inserted into the electrical plug slot 310 of the next square-case cell to achieve high-voltage connection between the adjacent square-case cells. The method and the device have the advantages that the adjacent square shell battery cells are connected in a traditional welding or screwing mode, the failure risk caused by welding or screwing is effectively reduced, the production efficiency is improved, the connection mode between the square shell battery cells is optimized, and the assembly efficiency of the battery module is greatly improved.

Referring to fig. 1, in an embodiment of the utility model, the square-shell cell includes: a cell body 100 and first and second poles 200 and 300.

Referring to fig. 1, the battery cell body 100 includes a case 120, an end cap 110, an electrode assembly (not shown), and an electrolyte (not shown). An opening is opened at a sidewall of the case 120, and the electrode assembly is assembled into the case 120 through the opening of the case 120, and an electrolyte is further injected into the case 120. An end cap 110 is capped at the opening of the housing 120 to achieve an integral seal. The electrode assembly comprises a positive electrode plate, a negative electrode plate and a separator with an insulating function. It is understood that the types of the battery cell body 100 include, but are not limited to, a lithium ion secondary battery cell body, a lithium ion primary battery cell body, a lithium sulfur battery cell body, a sodium lithium ion battery cell body, a sodium ion battery cell body, or a magnesium ion battery cell body, and the like, to which the embodiment of the present application is not limited.

With continued reference to fig. 1, the first pole 200 and the second pole 300 are disposed on the end surface of the battery cell body 100, and are electrically connected to the positive pole piece and the negative pole piece of the battery cell body 100, respectively. Wherein, the first pole 200 is provided with an electrical plug extension 210, the second pole 300 is provided with an electrical plug slot 310 which is matched and electrically connected with the electrical plug extension 210, so that the electrical plug extension 210 in one square-shell cell is inserted into the electrical plug slot 310 of the adjacent other square-shell cell to form a corresponding electrical connection relationship when stacked and assembled. Since the polarities of the first and second poles 200 and 300 are opposite, i.e., one of the first and second poles 200 and 300 is a positive pole and the other is a negative pole. Specifically, the first electrode post 200 and the positive electrode tab may be electrically connected to form a positive electrode post, and the second electrode post 300 and the negative electrode tab may be electrically connected to form a negative electrode post. The first electrode post 200 and the negative electrode plate may be electrically connected to form a negative electrode post, and the second electrode post 300 and the positive electrode plate may be electrically connected to form a positive electrode post. The connection mode of the specific pole and the pole piece is not limited.

Referring to fig. 1 to 3, fig. 2 is a schematic structural diagram of two poles on the same side of a battery cell according to an embodiment of the utility model, and fig. 3 is a schematic structural diagram of two poles on opposite sides of the battery cell according to an embodiment of the utility model. In an embodiment of the utility model, the first pole 200 and the second pole 300 are respectively disposed on the same end face or two opposite end faces of the battery cell body 100. When the end caps 110 are small in size, the first and second poles 200 and 300 may be symmetrically disposed on both end caps 110 of the cell body 100, considering that the first and second poles 200 and 300 and the explosion-proof valve 400 cannot be completely accommodated on the end surfaces of the same end cap 110. However, when the first pole 200 and the second pole 300 are respectively disposed on two sides of the battery cell body 100, the first pole 200 and the second pole 300 occupy a certain space of the square-case battery cell in the battery module, so that the available space of the square-case battery cell is reduced, and therefore the first pole 200 and the second pole 300 may be disposed side by side on the same end cap 110 of the battery cell body 100. The assembling modes of the two polar posts are different in applicable scene, and a person skilled in the art can adaptively select an appropriate assembling mode according to actual production requirements.

With continued reference to fig. 1-3, in an embodiment of the utility model, the first terminal 200 protrudes away from the cell body 100, and the electrical plug extension 210 is connected to a sidewall of the first terminal 200. The first pole 200 is a block-shaped convex structure that projects in a direction away from the end cap 110. The electrical plug extension 210 is connected to the side of the first pole 200 and protrudes in the direction of the width extension line of the first pole 200, such that the electrical plug extension 210 forms a T-shaped structure with the first pole 200 along a projected shape perpendicular to the plane of the end cap 110. Wherein the electrical plug extension 210 may be disposed at any location on the side wall of the first pole 200, i.e., the top surface of the electrical plug extension 210 may not be coplanar with the top surface of the first pole 200. Wherein, the top surface of the electrical plug extension 210 refers to the surface of the electrical plug extension 210 farthest from the battery core body 100, and similarly, the top surface of the first terminal 200 refers to the surface of the first terminal 200 farthest from the battery core body 100. However, in view of the robustness of the connection and the ease of machining, in one embodiment of the present utility model, the top surface of the electrical plug extension 210 and the top surface of the first pole 200 are coplanar.

Referring to fig. 2 to 3, in an embodiment of the present utility model, the electrical plug extension 210 is a sheet-like structure or a cylindrical structure. In particular, the electrical plug extension 210 may be a flat elongated sheet-like structure, one side of the electrical plug extension 210 being connected with the first pole 200, and the other side of the electrical plug extension 210 protruding in the width direction of the first pole 200. With such a sheet-like structure, the flat elongated sheet-like structure may withstand a large compressive force from the electrical socket 310 during insertion of the electrical socket extension 210 into the electrical socket 310. Furthermore, the electrical plug extension 210 may have a cylindrical structure (not shown in the drawings), one end of which is connected to the first pole 200, and the other end of which protrudes in the width direction of the first pole 200. When inserting the electrical socket 310, the cylindrical structure has a better guiding effect, which is beneficial to guiding the electrical socket extension 210 to be quickly and accurately inserted into the electrical socket 310. Further, the electrical plug extension 210 and the first pole 200 may be provided in an integrally formed configuration to achieve a secure fit therebetween.

Referring to fig. 3 to 4, fig. 4 is a schematic structural diagram of a connection between a pole and an electrical plug extension according to an embodiment of the utility model. In an embodiment of the present utility model, the electrical plug extension 210 and the electrical plug slot 310 extend along the thickness direction of the battery cell body 100, wherein the extending direction of the electrical plug slot 310 is the plug direction of the square-case battery cell. One side of the first pole 200 passes through the end cover 110 to be electrically connected with the positive pole piece or the negative pole piece in the shell 120, and the other side is protruded towards the direction away from the end cover 110. The electrical plug extension 210 extends from the sidewall of the first terminal 200 in the thickness direction of the cell body 100. Accordingly, in order to mate with the electrical plug extension 210, the electrical plug slot 310 extends a distance within the second post 200 from one side of the second post 300 in the thickness direction of the cell body 100.

Referring to fig. 1-3, the electrical socket 310 may be a blind or a through slot. In one embodiment of the present utility model, the electrical socket 310 is a blind socket. The electrical socket 310 is formed on the sidewall of the second post 300 and extends from the sidewall of the second post 300 to the inside of the second post 300 in the thickness direction of the cell body 100. When two square-case cells are electrically connected, the electrical plug extension 210 of one square-case cell is inserted into the electrical plug slot 310 of the other square-case cell, and when the end face of the electrical plug extension 210 abuts against the inner wall of the electrical plug slot 310 of the other square-case cell, the electrical connection of the two square-case cells is completed. However, in consideration of the above plugging process, if the electrical plugging slot 310 is a blind slot, when the electrical plugging extension portion 210 of the front shell cell is plugged into the electrical plugging slot 310 of the other square shell cell under the action of external force, if the force is too strong or the plugging speed is too fast, the electrical plugging extension portion 210 of the front shell cell may strike the inner wall of the electrical plugging slot 310 of the other square shell cell, which may cause damage to the electrical plugging slot 310 or the electrical plugging extension portion 210. To avoid this, in another embodiment of the present utility model, the electrical socket 310 extends through the second post 300 in the direction of extension of the electrical socket extension 210. Specifically, the electrical plug extension 210 extends along the arrangement direction of the square-case cells, and the electrical plug slot 310 communicates with the opposite side of the second pole 300 along the arrangement direction parallel to the square-case cells from one side of the second pole 300 so as to extend through the entire second pole 200. When adjacent square shell electric cores are spliced, the electric splicing extension part 210 of the front square shell electric core can be quickly and smoothly inserted into the electric splicing groove 310 of the other square shell electric core along the arrangement direction of the square shell electric cores, so that the electric connection of the two square shell electric cores is realized. Therefore, the electric connection between the square shell electric cores can be realized quickly and accurately while a plurality of electric cores are arranged.

With continued reference to fig. 1-3, in order to avoid the problem of poor contact due to the gap between the electrical socket 310 and the electrical socket extension 210 during plugging, in an embodiment of the present utility model, the electrical socket 310 is in interference fit with the electrical socket extension 210. The slot dimensions of the electrical socket 310 should be slightly smaller than the dimensions of the electrical socket extension 210 so that the electrical socket extension 210, when inserted, will closely fit the inner walls of the electrical socket 310 to form an interference fit, resulting in a secure connection of the two.

Referring to fig. 1, 4 and 5, fig. 5 is a cross-sectional view showing the connection of the second post insertion guiding structure and the electrical socket in an embodiment of the utility model. In one embodiment of the present utility model, a mating guide structure is provided between electrical mating slot 310 and electrical mating extension 210. Plug guide structures may be provided on electrical plug slots 310 and/or electrical plug extensions 210. The mating guide structure may be the guide groove 320 or the guide angle 220. Illustratively, when the mating guide structure is disposed on the electrical mating slot 310, the guide slot 320 may be disposed along the insertion direction of the electrical mating extension 210. Specifically, the guide groove 320 is flared outward from the notch of the electric plug groove 310, so that the guide groove 320 and the electric plug groove 310 constitute a horn-shaped structure with a wide upper part and a narrow lower part. The wider guide slot 320 may guide the electrical plug extension 210 to quickly find the insertion location. It should be understood that this application only illustrates one plugging guiding structure, and any other structure that facilitates guiding the electrical plugging extension 210 into the electrical plugging slot 310 during plugging to achieve quick and accurate plugging of the two structures is not described herein. Further, when the mating guide structure is provided on the electrical mating extension 210, a guide angle 220 may be provided on the electrical mating extension 210. In an embodiment of the utility model, the edge of the electrical plug extension 210 facing away from the side of the first pole 200 is provided with a lead angle 220. The lead angle 220 may act as a guide for the electrical connector extension 210 during insertion, facilitating quick insertion of the electrical connector extension 210 into the electrical connector slot 310. Further, the shape of the lead angle 220 includes, but is not limited to, rounded corners, straight chamfer or inclined surfaces having a slope. In the plugging process, the guide angle 220 can guide the electric plug extension part 210 to smoothly enter the electric plug groove 310, so that the assembly efficiency can be improved, the abrasion of the electric plug extension part 210 or the electric plug groove 310 can be reduced, and the whole service life of the square-shell battery cell is effectively prolonged. Furthermore, in another embodiment of the present utility model, the electrical socket 310 is provided with a guiding slot 320, the electrical socket extension 210 is provided with a guiding angle 220, and when the adjacent square-shell cells are plugged, the guiding slot 320 on one square-shell cell and the guiding angle 220 on the other square-shell cell are matched with each other, so that the adjacent square-shell cells can be plugged accurately.

Referring to fig. 1 to 3, in an embodiment of the present utility model, an explosion-proof valve 400 is installed on the end cap 110. The explosion proof valve 400 assembly may be constructed in a conventional manner, such as providing an explosion proof sheet, and the explosion proof valve 400 may be disposed at a substantially middle position with respect to the two end caps 110 when the first and second poles 200 and 300 are located at the same side of the cell body 100. When the first and second poles 200 and 300 are located at opposite sides of the cell body 100, the explosion-proof valve 400 and the first pole 200 can be disposed in parallel on the end cover 110 and the explosion-proof valve 400 and the second pole 300 are disposed in parallel on the opposite end cover 100 due to the large usage space of the end cover 110. When the internal pressure of the battery is excessively large due to the generation of gas by overcharge, overdischarge, or overheating of the battery, the rupture disc in the explosion-proof valve 400 may be damaged so that the gas formed inside the battery cell body 100 may be discharged to the outside through the through-hole of the explosion-proof valve 400, thereby being able to prevent the battery cell from exploding.

Referring to fig. 6, fig. 6 is a schematic diagram illustrating a battery module according to an embodiment of the utility model. In an embodiment of the present utility model, a battery module is further provided, where the battery module includes a frame 500, and the square-case cells of any of the foregoing embodiments, at least two square-case cells are stacked and disposed in the frame 500, and adjacent square-case cells are electrically plugged with each other through the corresponding electrical plug extension 210 and the electrical plug slot 310. One side of the frame 500 is open, a plurality of square-case cells are stacked in the frame 500 through the open side of the frame 500, and the electrical plug extension 210 and the electrical plug slot 310 between two adjacent square-case cells are electrically plugged together in an interference fit manner to form a high-voltage connection. In an embodiment of the battery module of the present utility model, the bottom 510 of the frame is coated with the heat-conducting structural adhesive, so that not only the square-case battery cells can be firmly adhered in the frame 500, but also the heat generated by the work of the square-case battery cells can be transferred to the outside in time, so as to improve the heat dissipation efficiency of the battery module. The bottom 510 of the frame refers to a side of the frame 500 for carrying the square-shell battery cell. During assembly, after the previous square-shell cell is placed in the frame 500 and the square-shell cell is fixed in the frame 500 by using the heat-conducting structural adhesive, the next square-shell cell is placed, and the electric plug extension 210 of the previous square-shell cell is inserted into the electric plug slot 310 of the next square-shell cell, so that interference plug of the two square-shell cells is realized. And the square-case cell is fixed in the frame 500 by the heat conductive structural adhesive. And so on until the electric plug assembly among all the square shell electric cores is completed, and the electric connection among all the square shell electric cores is realized through the high-voltage connection of the first pole 200 and the second pole 300 among the adjacent square shell electric cores.

Referring to fig. 1 and 6, in one embodiment of the present utility model, the plugging direction of the electrical plug extension 210 and the electrical plug slot 310 is consistent with the stacking direction of the square-case cells. Each of the square-case cells may be stacked one on top of the other along the width of the frame 500 with the electrical plug extension 210 of the previous square-case cell inserted into the electrical plug slot 310 of the next square-case cell in sequence. The frame 500 has a rectangular parallelepiped structure, and the width direction of the frame 500 in this embodiment is a direction from the side with the smallest area of the frame 500 to the side with the smallest area of the opposite side.

With continued reference to fig. 1 and fig. 6, in an embodiment of the present utility model, the first electrode and the second electrode are respectively disposed on the same end face of the battery core body, and the first electrode and the second electrode on two adjacent battery cores are alternately arranged along the stacking direction of the battery core. When stacking a plurality of square-case cells in the frame 500, if the first and second poles 200 and 300 are respectively disposed on the same end face of the cell body 100, in order to electrically connect adjacent square-case cells, it is necessary to ensure that the first poles 200 of the previous square-case cell and the second poles 300 of the next square-case cell are alternately arranged. That is, when stacking a plurality of square-shell cells, the first poles 200 of the previous square-shell cell are staggered in the order of the second poles 300 of the next square-shell cell, so as to realize the electrical connection of the adjacent cells.

In summary, in the present utility model, the first pole and the second pole are respectively disposed on the end face of the battery core body, the first pole is provided with the electrical plug extension portion, the second pole is provided with the electrical plug groove, and the shape of the electrical plug groove is adapted to the shape of the electrical plug extension portion, so that the electrical plug groove and the electrical plug extension portion of the adjacent square-shell battery core can be electrically connected in a matched manner. Therefore, when the battery module is assembled by stacking a plurality of square-shell electric cells in the frame, the electric plug extension part of the previous square-shell electric cell is inserted into the electric plug groove of the next electric cell, so that high-voltage connection among the square-shell electric cells is realized, and the assembly of the battery module is completed. By directly arranging the electric plug extension and the electric plug groove on the first pole and the second pole respectively, when the battery module is assembled, the square shell battery cells are only required to be stacked into the frame, and the electric plug extension of the adjacent square shell battery cells is kept in interference plug with the electric plug groove. Compared with the traditional method of connecting the battery cells with the busbar through welding or spiro union to realize the connection between the battery cells, the square shell battery cell of this application no longer adopts welding or spiro union, has promoted production efficiency, has optimized the connected mode between the battery cells, has greatly promoted the packaging efficiency of battery module or battery package PACK, can satisfy current-carrying and mechanical properties simultaneously. On the other hand, as the welding or screwing process is omitted, the welding failure rate is reduced, the failure risks such as short circuit or insulation caused by welding slag are effectively avoided, and the whole package weight of the screwing process equipment is avoided. Therefore, the utility model effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. A square cell, comprising:

the battery cell comprises a battery cell body, a first pole and a second pole, wherein the first pole and the second pole are arranged on the end face of the battery cell body;

wherein, be provided with electric grafting extension on the first utmost point post, be provided with electric grafting groove on the second utmost point post, and electric grafting groove's shape and electric grafting extension's shape looks adaptation.

2. The square-case cell of claim 1, wherein the first and second poles are disposed on a same end face or opposite end faces of the cell body, respectively.

3. The square-case cell of claim 1, wherein the electrical plug extension is a sheet-like structure or a cylindrical structure.

4. The square-housing cell of claim 1 wherein the electrical plug extension and the electrical plug slot extend in a thickness direction of the cell body.

5. The square-case cell of claim 4, wherein the electrical plug-in slot is a blind slot.

6. The square-housing cell of claim 1, wherein the electrical plug slot is interference-plugged with the electrical plug extension.

7. The square-housing cell of claim 1, wherein a mating guide structure is provided between the electrical mating slot and the electrical mating extension.

8. A battery module comprising a frame, further comprising at least two square-case cells of any one of claims 1 to 7, at least two of the square-case cells being stacked in the frame, and

adjacent square shell electric cores are electrically connected through the corresponding electric connection extension parts and the electric connection grooves.

9. The battery module of claim 8, wherein the plugging direction of the electrical plug extension and the electrical plug slot coincides with the stacking direction of the square-case cells.

10. The battery module according to claim 9, wherein the first and second poles are respectively disposed on the same end face of the cell body, and the first and second poles on two adjacent square-case cells are alternately arranged along the stacking direction of the square-case cells.