CN220544065U

CN220544065U - Battery cover plate and battery

Info

Publication number: CN220544065U
Application number: CN202322199798.4U
Authority: CN
Inventors: 李恩令; 黄向峰; 冯玉川; 李峥; 何泓材
Original assignee: Suzhou Qingtao New Energy S&T Co Ltd
Current assignee: Suzhou Qingtao New Energy S&T Co Ltd
Priority date: 2023-08-16
Filing date: 2023-08-16
Publication date: 2024-02-27
Anticipated expiration: 2033-08-16

Abstract

The application relates to a battery cover plate and a battery. The battery cover plate comprises a top cover plate and a plastic sheet which are sequentially distributed along the longitudinal direction, and an insulating ring which is arranged around the plastic sheet. The application still relates to a battery that contains this battery cover plate, and the plastic piece is located between electric core and the top cap piece this moment, and the insulating ring setting is between battery case and battery cover plate, and the plastic piece can prevent to take place the short circuit between electrode assembly and the top cap, and the insulating ring can play sealed effect. According to the battery cover plate, on one hand, leakage of a battery core can be avoided, and on the other hand, short circuit of the battery core caused by the fact that welding slag and metal scraps splashed when the battery shell and the battery cover plate are subjected to laser welding enter the battery can be avoided; in addition, the assembly precision between the battery shell and the battery cover plate can be improved, and the quality of the battery is improved.

Description

Battery cover plate and battery

Technical Field

The application relates to the technical field of electric cores and batteries, in particular to a battery cover plate and a battery.

Background

From the angle of the cell structure, the battery mainly comprises square aluminum shell/steel shell batteries, cylindrical steel shell batteries, soft package square batteries and plastic shell square batteries. Compared with other types of batteries, the square aluminum shell battery has the advantages of simple structure, complete autonomy of external package and low cost; meanwhile, the square battery has a simpler structure, so that the square aluminum shell battery is different from a cylindrical battery in that stainless steel with higher strength is adopted as a shell, and accessories such as an explosion-proof safety valve are arranged, so that the weight of the whole accessory is lighter than that of the cylindrical battery; in addition, the energy density of the square battery is theoretically higher than that of the cylindrical battery, and the square battery has the advantages of high structural strength, good mechanical load bearing capacity, small internal resistance of the battery, long service life, small energy density reduction after composition and high space utilization rate. Therefore, square aluminum-shell batteries with relatively low cost and high battery energy density are mainly adopted by domestic power battery manufacturers.

With the strong support of the national development of new energy automobiles, the domestic power battery manufacturers apply the square aluminum shell battery cells to ensure that the installation quantity of the square aluminum shell battery is ridden and dust is isolated, and the square aluminum shell battery is pushed to the public opinion center once along with the ascending of the installation quantity, so that the structure of the square aluminum shell battery is optimized continuously, and the safety performance of the square aluminum shell battery is improved to be the weight of the square aluminum shell battery development road continuously.

Disclosure of Invention

In view of the above, it is desirable to provide a battery cover plate that improves battery safety and a battery including the same.

In one aspect, a battery cover plate is provided, comprising:

a top cover sheet on which a pole is provided;

the plastic sheet is positioned at one side of the top cover sheet, and a circumferential groove is formed in the lateral side of the plastic sheet; and

and the insulating ring is matched with the circumferential groove, and is in butt fit with the battery shell.

In some embodiments, the battery cover plate further comprises a connecting piece, wherein the connecting piece is arranged on one side of the plastic piece away from the top cover piece.

In some embodiments, the side of the plastic sheet remote from the top cover sheet is provided with a limit groove for engaging the connecting sheet.

In some embodiments, a first liquid injection port and a first explosion vent are provided in the top cover sheet.

In some embodiments, the plastic sheet is provided with a second liquid injection port, a second explosion-proof hole and a through hole.

In some embodiments, the first explosion vent communicates with the second explosion vent and the first fluid injection port communicates with the second fluid injection port.

In some embodiments, a rupture disc is disposed within the first rupture disc.

In some embodiments, an explosion-proof valve protection patch is further disposed in the first explosion-proof hole, and the explosion-proof valve protection patch is used for forming a closed space with the explosion-proof sheet.

In some embodiments, the insulating ring has a longitudinal thickness equal to or less than a longitudinal length of the circumferential groove.

In some embodiments, the insulating ring is made of fluororubber, ethylene propylene diene monomer or PFA.

A second aspect of the present application provides a battery comprising the battery cover of the first aspect.

The battery cover plate of the application comprises a top cover plate, a plastic piece and an insulating ring which is arranged around the plastic piece. When the battery is generated, the plastic sheet is positioned between the battery core and the top cover sheet, and the insulating ring is positioned between the battery shell and the plastic sheet; the plastic sheet can prevent short circuit between the electrode assembly and the top cover, and the insulating ring can play a role in sealing. The ingenious arrangement of the insulating ring prevents the leakage of the battery cell on one hand; on the other hand, the short circuit of the battery core caused by the fact that welding slag and metal scraps splashed when the battery shell and the battery cover plate are subjected to laser welding enter the battery is avoided; in addition, the assembly precision between the battery shell and the battery cover plate can be improved, and the quality of the battery is improved.

Drawings

Fig. 1 is a schematic structural diagram of a battery cover plate according to an embodiment of the present application.

Fig. 2 is an exploded view of a battery cover plate according to an embodiment of the present application.

Fig. 3 is a schematic structural view of a plastic sheet in a battery cover plate according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of an insulating ring according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a plastic sheet and an insulating ring in a battery cover plate according to an embodiment of the present application.

Description of the reference numerals

1. A top cover sheet; 2. a plastic sheet; 3. a connecting sheet; 4. an insulating ring;

11. a pole; 12. a first explosion-proof hole; 13. a first liquid injection port; 14. an explosion-proof valve protection patch;

21. a through hole; 22. a second explosion-proof hole; 23. a second liquid injection port; 24. a circumferential groove;

31. an assembling portion; 32. pins.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below. It is intended that the present application cover such modifications and variations as fall within the scope of the appended claims and their equivalents. Other objects, features and aspects of the present utility model will be disclosed in or be apparent from the following detailed description. It is to be understood by one of ordinary skill in the art that the present discussion is a description of exemplary embodiments only, and is not intended as limiting the broader aspects of the present utility model.

In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms refer to the orientation or positional relationship based on the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

The a direction as shown in fig. 2 is defined as the lateral direction, and the B direction perpendicular to the lateral direction is defined as the longitudinal direction.

Referring to fig. 1 and 2, fig. 1 and 2 show a schematic structural diagram of a battery cover plate in an embodiment of the present application, where the battery cover plate provided in an embodiment of the present application includes a top cover sheet 1 and a plastic sheet 2 sequentially distributed along a longitudinal direction, and an insulating ring 4 matched with a circumferential groove 24 of the plastic sheet 2.

The top cover sheet 1 is of a rectangular sheet structure, and one side of the top cover sheet 1 far away from the plastic sheet 2 is provided with a pole 11, a first explosion-proof hole 12 and a first liquid injection port 13. Wherein the first explosion proof hole 12 is located at the center of the top cover sheet 1, penetrating the top cover sheet 1; the first liquid injection port 13 is positioned at one side of the first explosion-proof hole 12 and is used for injecting electrolyte into the battery cell; the number of the polar posts 11 is 2, and the polar posts 11 are respectively positioned at two sides of the first explosion-proof hole 12, and the lower surface of the polar posts 11 is flush with the upper surface of the top cover plate 1.

The plastic sheet 2 is a rectangular sheet structure with the same size as the top cover sheet 1, and is tightly attached to one side of the top cover sheet 1 far away from the pole 11. The plastic sheet 2 is provided with a through hole 21, a second explosion-proof hole 22, a second liquid injection port 23 and a circumferential groove 24. Wherein the second explosion proof hole 22 is located at the center of the plastic sheet 2, penetrates the plastic sheet 2, and the first explosion proof hole 12 and the second explosion proof hole 22 are at least partially overlapped, so that the first explosion proof hole 12 is communicated with the second explosion proof hole 22. The second liquid injection port 23 is similar to the first liquid injection port 13 and is positioned at one side of the second explosion-proof hole 22 and is used for injecting electrolyte into the battery cell; the second liquid injection port 23 partially overlaps the first liquid injection port 13, so that the first liquid injection port 13 and the second liquid injection port 23 communicate. The through holes 21 are arranged at two sides of the second explosion-proof hole 22, penetrate through the plastic sheet 2, and are used for releasing pressure when the internal air pressure of the battery is too high, and specifically, the impact force generated by the internal air passes through the through holes 21 from bottom to top to be released from the first explosion-proof hole 12 on the top cover sheet 1. A circumferential groove 24 is provided in the lateral side of the plastic sheet 2 for matching the insulating ring 4.

The insulating ring 4 is a rectangular rubber ring, preferably a rubber ring having a rectangular hollow interior region, as shown in fig. 4 to 5.

It can be appreciated that the structure of the pole is not particularly limited, the pole can be adaptively adjusted according to design or production requirements, and the cross section of the foreseeable pole can be rectangular or circular or other regular or irregular shapes, so long as the pole can be electrically connected with the connecting sheet positioned at the other side of the plastic sheet. Similarly, the structures of the first explosion-proof hole, the second explosion-proof hole, the first liquid injection port and the second liquid injection port are not particularly limited.

In some embodiments, the battery cover plate further comprises a connecting sheet 3, wherein the connecting sheet 3 is arranged on one side of the plastic sheet 2 away from the top cover sheet 1, and a limiting groove is arranged on one side of the plastic sheet 2 away from the top cover sheet 1, so as to be used for clamping the connecting sheet 3.

The connecting sheet 3 comprises a positive electrode connecting sheet and a negative electrode connecting sheet which are respectively electrically connected with a positive electrode lug and a negative electrode lug of the battery cell so as to ensure that the battery cell can perform normal charge and discharge operation. The number of the limiting grooves is adaptively matched with the number of the connecting sheets 3, namely 2, and the limiting grooves are symmetrically distributed in the transverse direction of the plastic sheet 2; preferably, the two terminals are symmetrically distributed on both sides of the top cover sheet 1 and the plastic sheet 2.

As shown in fig. 2 for example, the connecting piece 3 includes an angularly connected fitting portion 31, a pin 32, and a transition portion connecting the fitting portion and the pin. The assembly part 31 is of a sheet structure with uniform thickness, the assembly part 31 is fixedly connected with the transition part, the transition part is also fixedly connected with the pin, and an included angle of 90 degrees is formed between the assembly part and the pin. When the plastic sheet connecting device is used, the assembling part 31 in the connecting sheet 3 is clamped into the limiting groove of the plastic sheet 2, so that the plastic sheet 2 and the connecting sheet 3 are stably connected, and relative rotation or shaking is not easy to occur.

Preferably, the fitting portion 31 and the plastic sheet 2 are laser welded, so that the connection firmness between the two is further improved.

In some embodiments, the plurality of through holes 21 are distributed on the plastic sheet 2 at intervals, so that on one hand, the risk of breakage of the plastic sheet 2 caused by thermal expansion of the plastic sheet 2 when the battery heats and shrinkage of the plastic sheet 2 when the battery returns to normal temperature can be reduced. On the other hand, a plurality of paths are added for the overflow of the generated gas of the battery cell, so that the risk that the first explosion-proof hole 12 cannot be opened in time can be further reduced. In other words, the plurality of through holes 21 effectively improves the safety performance of the battery while improving the reliability and stability of the plastic sheet.

In some embodiments, the electrode 11 comprises a positive electrode and a negative electrode.

In some embodiments, the top cover sheet is made of aluminum, which can prevent electrolyte inside the battery from corroding the top cover sheet, and of course, other metals with electrolyte corrosion resistance can be used as the top cover sheet, which is within the protection scope of the application.

In some embodiments, the plastic sheet material is polypropylene (PP) or Polyphenylene Sulfide (PPs).

In some embodiments, the insulating rubber ring material is fluororubber, ethylene propylene diene monomer, or polyvinyl fluoride copolymer (PFA).

In some embodiments, the connecting piece is a copper or aluminum material. The connecting sheet of the material has good conductivity and is easy to be welded with the top cover pole. The material of the connecting sheet can be selected according to the material of the pole and the pole lug, the material which is the same as the pole lug and the pole lug is preferentially selected, and the welding is easier.

In some embodiments, a rupture disc is disposed within the first rupture disc 12. The explosion-proof piece is fixed in the first explosion-proof hole 12 in a welding mode, and plays a role in sealing and protecting the battery, and more particularly plays a role in protecting the battery cover plate and the air tightness of the battery core inside the battery.

In some embodiments, an explosion-proof valve protection patch 14 is also disposed within the first explosion-proof aperture 12 to protect the rupture disc. The explosion-proof valve protection patch 14 is attached to the boss inside the first explosion-proof hole 12, and forms a closed space with the explosion-proof sheet, so that on one hand, electrolyte remained on the battery cover plate can be prevented from flowing into the upper surface of the explosion-proof sheet in the process of injecting the electrolyte, and on the other hand, the explosion-proof sheet can be prevented from being pierced by external foreign matters, so that potential safety hazards of the battery are brought.

In some embodiments, the insulating ring 4 abuts against the battery case, and plays a role in sealing in a square aluminum case battery.

In some embodiments, the longitudinal thickness of the insulating ring 4 is equal to or slightly less than the longitudinal length of the circumferential groove 24 in the plastic sheet 2; preferably, the longitudinal thickness of the insulating ring 4 corresponds to the longitudinal length of the circumferential groove 24.

A second aspect of the present application provides a battery comprising a housing, a cell, and a battery cover of the first aspect. Wherein the shell is for having open cuboid form structure, and the electric core sets up in the casing is inside, and battery apron sets up in the open department of casing, and matches with the shell welding.

Specifically, the battery cell is placed in the shell from the opening, then the battery cover plate is arranged at the opening of the shell, and the connecting sheet 3 of the battery cover plate is inserted into the shell from two sides of the battery cell; pole pieces with different polarities of the battery core extend out from two sides of the battery core, so that 2 connecting pieces can be connected conveniently. The battery cover plate and the shell form a sealed whole body through a laser welding mode.

The plastic sheet 2 is located between the battery core and the top cover sheet 1 of the battery cover plate, so that short circuit between the electrode assembly and the battery cover plate can be prevented, and particularly short circuit between the electrode assembly and the pole 11 on the top cover sheet 1 is prevented, so that potential safety hazards are caused.

The insulating ring 4 is matched with the axial groove of the plastic sheet 2, so that the insulating ring 4 is abutted against the shell of the battery in the battery, and the sealing effect is achieved. Specifically, the insulating ring 4 can reduce the risk of electric core weeping on the one hand and the risk that the electric core short circuit is caused by the spattered welding slag and metal scraps entering the battery when the laser welding is carried out between the shell and the battery cover plate. On the other hand, the assembly precision of the battery cover plate and the shell can be improved, so that the quality of the battery is improved.

In addition, it is expected that a great deal of heat is generated during the welding of the pole encapsulation injection molding or riveting structure, and the battery can generate heat in the charging and discharging process, so that the plastic sheet can generate the phenomenon of repeated expansion and contraction, thereby causing the bending deformation of the top cover sheet fixedly connected with the plastic sheet, and even the deformation of the whole battery cover plate, and further causing the potential safety hazard of the battery. The existence of the insulating sheet can apply fixed restraining force to the periphery of the plastic sheet when the plastic sheet deforms, so that the position deviation generated by the transverse expansion of the plastic sheet due to heat expansion and cold contraction is reduced.

In some embodiments, the insulating ring 4 is a ring-like structure as shown in fig. 4-5, with a consistent longitudinal thickness. The longitudinal thickness of the insulating ring 4 corresponds to the longitudinal length of the circumferential groove 24 in the plastic sheet 2.

In some embodiments, the insulating ring 4 may also assume a state in which the inner ring thickness is greater than the outer ring thickness, and by way of example, its inner edge longitudinal thickness coincides with the longitudinal length of the circumferential groove 24, and its outer edge intermediate portion is convex to the outside. In the production and use process of the battery, the insulating ring 4 can be expanded and deformed at high temperature, and at the moment, because gaps exist at two sides of the protruding part, the expansion and deformation tend to be carried out towards two sides of the protruding part, so that the insulating ring 4 can be prevented from generating larger pressure on the battery shell when expanding outwards to a certain extent, and the effect of releasing stress is achieved; alleviate plastic piece cooling shrinkage deformation's phenomenon, and then avoid plastic piece shrink to battery cover plate and even battery's influence.

In some embodiments, the outer edge of the insulating ring 4 has a circumferential length that is longer than the lateral circumferential length of the housing, so that the insulating ring 4 better abuts against the housing, further improving the sealability of the battery.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. A battery cover plate, comprising:

a top cover sheet on which a pole is provided;

the insulating ring is matched with the circumferential groove, and the insulating ring is used for being in butt fit with the battery shell.

2. The battery cover plate of claim 1, further comprising a connecting tab disposed on a side of the plastic tab remote from the top cover tab.

3. The battery cover plate according to claim 2, wherein a limit groove is formed in one side, away from the top cover plate, of the plastic plate, and the limit groove is used for being clamped with the connecting plate.

4. The battery cover plate of claim 1, wherein the top cover plate is provided with a first liquid injection port and a first explosion-proof hole.

5. The battery cover plate of claim 4, wherein the plastic sheet is provided with a second liquid injection port, a second explosion-proof hole and a through hole.

6. The battery cover plate of claim 5, wherein the first explosion vent communicates with the second explosion vent and the first fluid injection port communicates with the second fluid injection port.

7. The battery cover plate of claim 4, wherein the first explosion-proof aperture has an explosion-proof tab disposed therein.

8. The battery cover plate of claim 7, wherein an explosion-proof valve protection patch is further disposed in the first explosion-proof hole, and the explosion-proof valve protection patch is configured to form a closed space with the explosion-proof sheet.

9. The battery cover plate of claim 1, wherein a longitudinal thickness of the insulating ring is equal to or less than a longitudinal length of the circumferential groove.

10. A battery comprising a battery cover as claimed in any one of claims 1 to 9.