CN219393456U - Cell and cell module - Google Patents

Abstract

The utility model provides a battery cell and a battery cell module, and belongs to the technical field of new energy batteries. The battery cell comprises a positive pole, a negative pole and a battery cell shell, wherein the battery cell shell comprises a top plate, a first side plate and a second side plate, the first side plate and the second side plate are oppositely arranged on two sides of the top plate, the top plate is rectangular, a first pole mounting groove is formed in one end of the first side plate in the length direction of the top plate, a second pole mounting groove is formed in the other end of the second side plate in the length direction of the top plate, the positive pole is arranged in the first pole mounting groove, and the negative pole is arranged in the second pole mounting groove. Through the optimization to electric core shell structure, solve electric core storage and production and welding short circuit risk problem under the operating mode, need not to carry out outside protection to the machining efficiency of electric core when the module effectively improves.

Description

Cell and cell module

Technical Field

The utility model relates to the technical field of new energy batteries, in particular to an electric core and an electric core module.

Background

Problems such as environmental pollution and energy shortage are increasingly prominent in recent years. Lithium ion batteries have been widely used in the fields of communication and electronic devices, energy storage power stations, new energy automobiles, and the like, due to their advantages such as green environmental protection, high energy density, low self discharge, long cycle life, and the like. The battery core of square shell is a common battery core structure in the field of lithium ion batteries, a coil core package is arranged in a square shell, a pole lug of the coil core package is welded with a pole post on a top cover through a current collecting piece, and finally a top cover sealing cover is arranged on the square shell to complete assembly. The poles are generally distributed on two sides of the top cover, in the process of forming the battery cell module by utilizing the square shell battery cells, the top of the square shell battery cells is also required to be provided with a busbar for connecting the battery cells in series and parallel to form a module, and the busbar is required to be pressed on the pole poles by using a full-page copper nozzle for penetration welding during welding.

In the related art, the existing square-shell battery core electrode column needs special attention to the short circuit of the battery core in storage and production and manufacture, and the electrode column surface is extremely dangerous in self-discharge once contacting the conductor surface, so that the product and the battery core are extremely unsafe and inconvenient. In order to solve the defect, a masking tape or a rubber sleeve is usually used for covering a pole to be welded to perform temporary insulation protection, but the masking tape is adhered for a long time, the problem that the masking tape remains on the pole when the masking tape is removed before welding processing, and the residual adhesive can influence the welding yield; the rubber sleeve mode also has the procedures of taking down one by one, is troublesome to operate and is complex to recycle. Short circuit prevention modes in the related art can influence the processing efficiency of the battery cell in the process of forming the module.

Disclosure of Invention

The embodiment of the utility model provides a battery cell and a battery cell module, which solve the problem of short circuit risk under the working conditions of battery cell storage and production welding by optimizing the structure of a battery cell shell, and do not need external protection, thereby effectively improving the processing efficiency of the battery cell in the process of forming the module. The technical scheme is as follows:

in a first aspect, an embodiment of the present utility model provides a cell and a cell module, including: a positive pole, a negative pole and a battery core shell,

the battery cell casing include the roof with set up relatively in first curb plate and the second curb plate of roof both sides, the roof is the rectangle, first curb plate is in the ascending one end of length direction of roof is provided with first post mounting groove, the second curb plate is in the ascending other end of length direction of roof is provided with the second post mounting groove, the positive pole set up in the first post mounting groove, the negative pole set up in the second post mounting groove.

Optionally, the length of the positive electrode post is greater than the depth of the first and second electrode post mounting grooves in a direction perpendicular to the first and second side plates; the length of the negative electrode post is greater than the depths of the first and second post mounting grooves in a direction perpendicular to the second side plate.

Optionally, the first pole mounting groove and the second pole mounting groove are both in communication with the top plate.

Optionally, the electric core casing still including set up relatively in the third curb plate and the fourth curb plate of the other both sides of roof, first curb plate third curb plate second curb plate with the fourth curb plate connects gradually, first utmost point post mounting groove with third curb plate intercommunication, second utmost point post mounting groove with fourth curb plate intercommunication.

Optionally, insulating rubber rings are sleeved at contact positions of the positive pole post and the negative pole post and the battery cell shell.

Optionally, an explosion-proof valve is arranged on the top plate.

Optionally, the top plate is provided with a liquid injection hole.

Optionally, the electric core further comprises a voltage acquisition sheet, and the voltage acquisition sheet is welded on the positive pole or the negative pole.

In a second aspect, an embodiment of the present utility model further provides a battery cell module, including a plurality of battery cells according to the foregoing first aspect, where the plurality of battery cells are stacked in a direction perpendicular to the first side plate and the second side plate, and the positive electrode posts and the negative electrode posts of two adjacent battery cells are oppositely arranged and connected by laser welding.

Optionally, temperature equalizing plates are arranged at the top and the bottom of the plurality of the battery cells.

The technical scheme provided by the embodiment of the utility model has the beneficial effects that at least:

through setting up positive pole post and negative pole post respectively on the first curb plate and the second curb plate of relative arrangement, in preparation production operating mode and the storage process, even set up conductors such as connecting busbar on the roof, positive pole post and negative pole post can not appear the risk of short circuit owing to not arranging on the roof. Meanwhile, in the process of forming the battery cell module by utilizing the battery cells, the battery cells can be arranged in a stacked manner along the direction perpendicular to the first side plate and the second side plate, two adjacent battery cells adopt the structures described in the two embodiments, the positive pole and the negative pole are reversely arranged, and finally the adjacent positive pole and the negative pole are connected through laser welding, so that bridging of the battery cells is realized. When the module is processed, the connection busbar structure can be optimized, and external protection is not required for the positive pole and the negative pole, so that the processing efficiency of the battery cell in the module formation process is effectively improved.

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 schematic perspective view of a battery cell according to an embodiment of the present utility model;

fig. 2 is a schematic perspective view of another electrical core according to an embodiment of the present utility model;

fig. 3 is an enlarged view of a partial structure of a battery cell according to an embodiment of the present utility model;

fig. 4 is a schematic top view of a battery module according to an embodiment of the present utility model;

fig. 5 is a schematic side view of a battery cell module according to an embodiment of the utility model.

In the figure:

1-a positive electrode post; 2-a negative electrode column; 3-a cell housing; 4-insulating rubber rings; 5-a voltage acquisition sheet; 6-a temperature equalization plate; 31-top plate; 32-a first side plate; 33-a second side panel; 34-a third side panel; 35-fourth side panel; 311-explosion-proof valve; 312-liquid injection holes; 321-a first pole mounting groove; 331-second pole mounting groove; j-laser.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the embodiments of the present utility model will be described in further detail with reference to the accompanying drawings.

In the related art, the existing square-shell battery core electrode column needs special attention in the production and manufacture of battery core short circuit, the electrode column surface can self discharge once contacting the conductor surface, the electrode column surface is dangerous, and the product and the battery core can be extremely unsafe and inconvenient. In order to solve the defect, a masking tape or a rubber sleeve is usually used for covering a pole to be welded to perform temporary insulation protection, but the masking tape is adhered for a long time, the problem that the masking tape remains on the pole when the masking tape is removed before welding processing, and the residual adhesive can influence the welding yield; the rubber sleeve mode also has the procedures of taking down one by one, is troublesome to operate and is complex to recycle. Short circuit prevention modes in the related art can influence the processing efficiency of the battery cell in the process of forming the module.

Fig. 1 is a schematic perspective view of a battery cell according to an embodiment of the present utility model. Fig. 2 is a schematic perspective view of another electrical core according to an embodiment of the present utility model. Fig. 3 is an enlarged view of a partial structure of a battery cell according to an embodiment of the present utility model. As shown in fig. 1 to 3, in practice, the applicant provides a cell and a cell module comprising a positive electrode post 1, a negative electrode post 2 and a cell housing 3.

The cell casing 3 includes a top plate 31, a first side plate 32 and a second side plate 33 disposed on two sides of the top plate 31, the top plate 31 is rectangular, a first pole mounting groove 321 is disposed at one end of the first side plate 32 in the length direction of the top plate 31, a second pole mounting groove 331 is disposed at the other end of the second side plate 33 in the length direction of the top plate 31, the positive pole 1 is disposed in the first pole mounting groove 321, and the negative pole 2 is disposed in the second pole mounting groove 331.

In the embodiment of the present utility model, the battery cell casing 3 is integrally of a laterally arranged cube structure, wherein the first side plate 32 and the second side plate 33 are large surfaces connected to the top plate 31, that is, the first side plate 32 and the second side plate 33 are connected to opposite long sides of the top plate 31. At both ends in the length direction of the top plate 31, a first pole mounting groove 321 is concavely provided at a position on the first side plate 32 near one end of the top plate 31, a second pole mounting groove 331 is concavely provided at a position on the second side plate 33 near the other end of the top plate 31, the positive pole 1 is provided in the first pole mounting groove 321, and the negative pole 2 is provided in the other one of the second pole mounting grooves 331. That is, in the embodiment of the present utility model, there are two kinds of cells in which the positive electrode post 1 and the negative electrode post 2 are arranged at opposite positions, and in one embodiment, the first electrode post mounting groove 321 is provided at one end of the top plate 31 in the length direction, and the second electrode post mounting groove 331 is provided at the other end of the top plate 31 in the length direction; in another embodiment, the first pole mounting groove 321 is disposed at the other end of the top plate 31 in the length direction, and the second pole mounting groove 331 is disposed at the one end of the top plate 31 in the length direction.

According to the battery cell provided by the embodiment of the utility model, the positive electrode column 1 and the negative electrode column 2 are respectively arranged on the first side plate 32 and the second side plate 33 which are oppositely arranged, so that the risk of short circuit can not occur because the positive electrode column 1 and the negative electrode column 2 are not arranged on the top plate 31 even if conductors such as a connecting busbar are arranged on the top plate 31 in the production working condition and the storage process. Meanwhile, in the process of forming the battery cell module by utilizing the plurality of battery cells, the plurality of battery cells can be arranged in a stacked manner along the direction perpendicular to the first side plate 32 and the second side plate 33, two adjacent battery cells adopt the structures described in the two embodiments, the positive pole 1 and the negative pole 2 are reversely arranged, and finally the adjacent positive pole 1 and the negative pole 2 are connected by laser welding, so that bridging of the plurality of battery cells is realized. When the module is processed, the connection busbar structure can be optimized, and external protection is not needed for the positive pole 1 and the negative pole 2, so that the processing efficiency of the battery cell in the module formation is effectively improved.

Alternatively, the length of the positive electrode tab 1 is greater than the depths of the first and second electrode tab mounting grooves 321 and 331 in a direction perpendicular to the first and second side plates 32 and 33; the length of the negative electrode post 2 is greater than the depths of the first and second post mounting grooves 321 and 331. Illustratively, the heights of the positive electrode tab 1 and the negative electrode tab 2 protrude from the plate surface of the first side plate 32 or the second side plate 33 in the direction perpendicular to the first side plate 32 and the second side plate 33 by a protruding length in the range of 0.5mm to 1mm. During the processing of the module, the positive pole 1 and the negative pole 2 protruding from the first side plate 32 and the second side plate 33 on the two adjacent electric cores can be tightly attached in the assembly gap between the two electric cores, so that a space is provided for a welding seam of laser welding, no additional guide piece is required to be additionally arranged between the adjacent positive pole 1 and the negative pole 2 for connection, and the processing efficiency of the electric cores during the module formation is further improved.

Alternatively, both the first pole mounting groove 321 and the second pole mounting groove 331 communicate with the top plate 31. Illustratively, in the embodiment of the present utility model, the concave spaces of the first pole mounting groove 321 and the second pole mounting groove 331 communicate with the top plate 31 in the longitudinal direction. When carrying out laser welding, laser welding device can directly stretch into the laser welding to adjacent positive pole 1 and negative pole 2 by first pole mounting groove 321 and the opening part of second pole mounting groove 331 on roof 31, and convenient processing has further improved the machining efficiency of electric core when the module.

Optionally, the cell casing 3 further includes a third side plate 34 and a fourth side plate 35 disposed on two other sides of the top plate 31, where the first side plate 32, the third side plate 34, the second side plate 33 and the fourth side plate 35 are sequentially connected, the first pole mounting groove 321 is communicated with the third side plate 34, and the second pole mounting groove is communicated with the fourth side plate 35 331. Illustratively, in the present embodiment, the third side plate 34 and the fourth side plate 35 are facets to which the top plate 31 is connected, that is, the first side plate 32 and the second side plate 33 are connected to opposite short sides of the top plate 31. The concave spaces of the first pole mounting groove 321 and the second pole mounting groove 331 are laterally communicated with the third side plate 34 and the fourth side plate 35. When carrying out laser welding, laser welding device can also stretch into the laser welding to adjacent positive pole 1 and negative pole 2 through the opening side direction of first pole mounting groove 321 and second pole mounting groove 331 on third curb plate 34 and fourth curb plate 35 again, makes the welding seam of positive pole 1 and negative pole 2 can be more abundant encircle the junction of pole 1 and negative pole 2, has further improved machining efficiency and welding stability when the electricity core is the module.

Optionally, insulating rubber rings 4 are sleeved at the contact positions of the positive pole 1 and the negative pole 2 and the cell shell 3. In the embodiment of the utility model, a layer of insulating rubber ring is sleeved between the contact positions of the positive electrode column 1 and the negative electrode column 2 and the battery cell casing 3, so that the positive electrode column 1 and the negative electrode column 2 are insulated and isolated from the battery cell casing 3 made of metal, short circuit is avoided, and the insulating performance of the battery cell is further improved.

Optionally, an explosion-proof valve 311 is provided on the top plate 31. Illustratively, in the embodiment of the utility model, by arranging the explosion-proof valve 311 on the top plate 31, when the temperature rise in the battery cell causes the gas in the battery cell housing 3 to expand, and the pressure increases to a certain extent, the nick or the explosion-proof film on the explosion-proof valve 311 is unwelded, broken and deflated, thereby preventing the explosion of the battery cell and further improving the safety of the battery cell.

Optionally, the top plate 31 is provided with a filling hole 312. In the embodiment of the utility model, during the preparation of the battery cell, electrolyte can be injected into the battery cell casing 3 through the liquid injection hole 312 on the top plate 31, and during the module forming process, when the laser welding of the adjacent battery cell positive electrode column 1 and the adjacent battery cell negative electrode column 2 is performed, sealing nails can be inserted into the liquid injection hole 312 in a clockwise manner for sealing welding, so that the processing efficiency of the battery cell during the module forming process is further improved.

Optionally, the battery cell further comprises a voltage acquisition sheet 5, and the voltage acquisition sheet 5 is welded on the positive pole 1 or the negative pole 2. Illustratively, in the embodiment of the present utility model, the voltage collecting tab 5 may be welded to the positive electrode post 1 or the negative electrode post 2 by means of laser J welding, and the wire harness on the voltage collecting tab 5 may be connected to an external detection device. When the battery cell performs charge and discharge work, voltage data of the battery cell is acquired in real time so as to monitor whether the battery cell works normally or not, and the safety of the battery cell is further improved.

Fig. 4 is a schematic top view of a battery module according to an embodiment of the present utility model. Fig. 5 is a schematic side view of a battery cell module according to an embodiment of the utility model. As shown in fig. 4 to 5, the embodiment of the present utility model further provides a battery cell module including a plurality of battery cells as shown in fig. 1 to 3, the plurality of battery cells being stacked in a direction perpendicular to the first side plate 32 and the second side plate 33, the positive electrode post 1 and the negative electrode post 2 of the adjacent two battery cells being disposed in opposite directions and being connected by laser welding. In the embodiment of the present utility model, in the process of forming the battery module by using a plurality of battery cells, the plurality of battery cells may be stacked in a direction perpendicular to the first side plate 32 and the second side plate 33, the two adjacent battery cells adopt the structure described in the foregoing two embodiments, the positive electrode column 1 and the negative electrode column 2 are reversely arranged, and finally, the adjacent positive electrode column 1 and the negative electrode column 2 are connected by laser welding, so as to realize bridging of the plurality of battery cells. When the module is processed, the connection busbar structure can be optimized, and external protection is not needed for the positive pole 1 and the negative pole 2, so that the processing efficiency of the battery cell in the module formation is effectively improved.

Optionally, the top and bottom of the plurality of cells are provided with temperature equalizing plates 6. Illustratively, in an embodiment of the present utility model, after a plurality of cells are stacked to form a cell module, the temperature equalizing plates 6 may be respectively adhered to the top and bottom thereof by using a heat conductive adhesive. Under different environmental temperatures, the temperature equalizing plate 6 is utilized to exchange heat with a plurality of electric cores, so that the working temperature of the electric core module is regulated and controlled, and the influence of the too low temperature on the charge and discharge performance of the electric cores is avoided; or the thermal runaway accident caused by the overhigh temperature further improves the working safety of the battery cell module.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of one of the components. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are present in front of "comprising" or "comprising" are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to denote relative positional relationships, which may also change accordingly when the absolute position of the object to be described changes.

The foregoing description of the preferred embodiments of the present utility model is not intended to limit the utility model, but rather, the utility model is to be construed as limited to the appended claims.

Claims (10)

1. A cell, comprising: a positive pole (1), a negative pole (2) and a battery core shell (3),

the battery cell casing (3) include roof (31) with set up relatively in first curb plate (32) and second curb plate (33) of roof (31) both sides, roof (31) are the rectangle, first curb plate (32) are in the ascending one end of length of roof (31) is provided with first utmost point post mounting groove (321), second curb plate (33) are in the ascending other end of length of roof (31) is provided with second utmost point post mounting groove (331), anodal post (1) set up in first utmost point post mounting groove (321), negative pole post (2) set up in second utmost point post mounting groove (331).

2. The cell of claim 1, wherein the length of the positive electrode post (1) is greater than the depth of the first and second post mounting grooves (321, 331) in a direction perpendicular to the first and second side plates (32, 33); the length of the negative pole (2) is greater than the depths of the first pole mounting groove (321) and the second pole mounting groove (331).

3. The cell of claim 1, wherein the first pole mounting groove (321) and the second pole mounting groove (331) are both in communication with the top plate (31).

4. A cell according to claim 3, wherein the cell housing (3) further comprises a third side plate (34) and a fourth side plate (35) which are oppositely arranged at the other two sides of the top plate (31), the first side plate (32), the third side plate (34), the second side plate (33) and the fourth side plate (35) are sequentially connected, the first pole mounting groove (321) is communicated with the third side plate (34), and the second pole mounting groove (331) is communicated with the fourth side plate (35).

5. The cell according to claim 1, characterized in that the contact positions of the positive pole (1) and the negative pole (2) and the cell housing (3) are respectively sleeved with an insulating rubber ring (4).

6. The cell according to claim 1, characterized in that the top plate (31) is provided with an explosion-proof valve (311).

7. The cell according to claim 1, wherein the top plate (31) is provided with a liquid injection hole (312).

8. The cell according to claim 1, characterized in that the cell further comprises a voltage acquisition tab (5), the voltage acquisition tab (5) being welded to the positive terminal (1) or the negative terminal (2).

9. A cell module comprising a plurality of cells according to any one of claims 1 to 7, a plurality of said cells being arranged in a stack in a direction perpendicular to said first side plate (32) and said second side plate (33), said positive and negative posts (1, 2) of adjacent two of said cells being arranged in opposite directions and connected by laser welding.

10. The cell module according to claim 9, wherein the top and bottom of a plurality of the cells are provided with temperature equalizing plates (6).