CN214957009U

CN214957009U - Square aluminum shell battery and battery module thereof

Info

Publication number: CN214957009U
Application number: CN202121325293.2U
Authority: CN
Inventors: 王昌权; 许飞; 杲绍芒; 杨随团; 席鹏飞; 李海龙; 买超杰; 高建华; 赵红娟
Original assignee: Multi Fluorine New Energy Technology Co ltd
Current assignee: Multi Fluorine New Energy Technology Co ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2021-11-30
Anticipated expiration: 2031-06-15

Abstract

The utility model relates to a square aluminum shell battery, which comprises a top cover plate component, a shell, an electrode component and a current collecting plate, wherein the top cover component comprises a top cover plate and a negative pole post component, a negative pole post leading-out hole is arranged on the top cover plate, the negative pole post component comprises a terminal plate and a negative pole post, the terminal plate is arranged at one side of the top cover plate and covers the negative pole post leading-out hole, an anode boss is arranged at the position corresponding to the negative pole post leading-out hole on the top cover plate, the current collecting plate comprises an anode current collecting plate and a negative current collecting plate, and the anode current collecting plate is directly connected to the top cover plate; the utility model discloses a structure optimization reduces anodal utmost point post subassembly and reaches the weight that reduces square aluminum hull battery and battery module, improves the energy density of square aluminum hull battery and battery module, also reaches the purpose that reduces square aluminum hull battery and battery module cost simultaneously; the utility model discloses still include a battery module including above-mentioned square aluminum hull battery.

Description

Square aluminum shell battery and battery module thereof

Technical Field

The utility model relates to the technical field of batteries, concretely relates to square aluminum hull battery and battery module thereof.

Background

In recent years, the power lithium battery industry in China has experienced development processes from endless, small to large, and weak to strong, at present, under the key support of national science and technology projects, the research on key technologies, key materials and products of the power lithium battery in China has made great progress, and the new energy automobile is also promoted to be widely popularized in China and even in the world, but a great number of places need to be improved to completely replace a fuel automobile; the problems of less driving mileage, high cost of the battery pack, reliability of the battery pack and the like of the automobile need to be further solved, and based on the problems, higher requirements are put forward on a core part power battery of the electric automobile, and the power battery needs to achieve higher energy density, lower cost and the like.

At present, a square aluminum shell battery shell comprises a shell body and a top cover plate assembly, wherein the shell provides a closed space for accommodating a battery cell and electrolyte, and electric energy of the battery cell is led out of the closed space from the closed space through positive and negative electrode poles of the top cover plate assembly; in the existing top cover plate assembly, a top cover plate is a metal plate and is provided with a through hole, a pole is divided into a positive pole and a negative pole, and a set of pole assemblies (comprising an upper insulating part, a lower insulating part, a terminal plate, a pole and a sealing ring) are arranged, in order to prevent the electric corrosion of a shell, a common aluminum shell is positively charged, so that the weight and the cost of a battery are reduced, whether the positive pole assembly is omitted or not can be avoided, and the current collector plate is directly connected with the top cover plate; therefore, a new prismatic aluminum-shell battery and a battery module thereof are needed to increase the energy density of the battery and reduce the cost of the battery.

Disclosure of Invention

The utility model aims at solving the above problem, and provide a square aluminum hull battery and battery module thereof, can realize reducing the part of square aluminum hull battery, reduce the weight of square aluminum hull battery, improve the energy density of square aluminum hull battery, also reduced the manufacturing cost of square aluminum hull battery simultaneously.

The purpose of the utility model is realized like this: a square aluminum shell battery comprises a top cover plate component, a shell, an electrode component and a current collecting plate, wherein the shell is provided with an opening, the electrode component is accommodated in the shell and comprises a positive electrode lug and a negative electrode lug, the top cover plate component comprises a top cover plate and a negative electrode post component, a negative electrode post leading-out hole is formed in the top cover plate, the negative electrode post component comprises a terminal plate and a negative electrode post, the terminal plate is connected with the negative electrode post, the terminal plate is arranged on one side of the top cover plate and covers the negative electrode post leading-out hole, a positive boss is arranged on the top cover plate at a position corresponding to the negative electrode post leading-out hole and is integrally formed by die stamping, the current collecting plate comprises a positive current collecting plate main body part and a current collecting plate bending part connected with the current collecting plate main body part, the current collecting plate main part of the positive current collecting plate is located on one side of the top cover plate and connected with the top cover plate, the current collecting plate bending part of the positive current collecting plate is located on one side, away from the top cover plate, of the positive current collecting plate and connected with the positive pole lug of the electrode assembly, the current collecting plate bending part of the negative current collecting plate comprises a current collecting plate main part and a current collecting plate bending part connected with the current collecting plate main part, the current collecting plate main part of the negative current collecting plate is located on one side of the top cover plate and connected with the negative pole post, and the current collecting plate bending part of the negative current collecting plate is located on one side, away from the top cover plate, of the negative current collecting plate and connected with the negative pole lug of the electrode assembly.

The anode collector plate is characterized in that the collector plate main body part of the anode collector plate and the collector plate bending part are of an integral structure and are formed at one time, the collector plate main body part of the cathode collector plate and the collector plate bending part are of an integral structure and are formed at one time, and the cathode collector plate is provided with a positioning hole and a welding hole which are used for connecting a cathode pole.

The cathode pole assembly further comprises an upper insulating part and a lower insulating part, and the upper insulating part and the lower insulating part are respectively fixed on the top surface and the lower surface of the top cover plate through the cathode pole.

The negative pole post assembly further comprises a sealing ring for preventing the electrolyte from leaking, and the sealing ring is arranged between the negative pole post and the top cover plate.

And an upper insulating part limiting groove of the negative electrode is formed around the negative electrode pole leading-out hole of the top cover plate, and corresponds to the upper insulating part of the negative electrode pole component.

And the top cover plate is provided with an explosion-proof valve hole for fixedly connecting the explosion-proof valve with the liquid injection.

The collector plate bending part of the anode collector plate is formed by folding two parts in half, and the collector plate bending part of the cathode collector plate is formed by folding two parts in half.

A battery module comprises a bus bar and a square aluminum shell battery, wherein the square aluminum shell battery is the square aluminum shell battery, and a backflow bar is welded on a positive electrode boss and a negative electrode pole of the square aluminum shell battery

The utility model has the advantages that: the utility model discloses a square aluminum hull battery and battery module thereof through the optimization of structure, reduces anodal utmost point post subassembly, with anodal collector plate lug connection to lamina tecti on, reaches the weight that reduces square aluminum hull battery and battery module, improves the energy density of square aluminum hull battery and battery module, also reaches the purpose that reduces square aluminum hull battery and battery module cost simultaneously.

Drawings

FIG. 1 is an exploded view of a prismatic aluminum cell according to an embodiment;

fig. 2 is an exploded view of a top cover plate assembly of the prismatic aluminum cell of fig. 1;

fig. 3 is a schematic top view of the prismatic aluminum-can cell of fig. 1;

FIG. 4 is a schematic cross-sectional view of the square aluminum cell of FIG. 3 taken along section line A-A;

fig. 5 is an enlarged view of a portion a of the prismatic aluminum-can cell of fig. 4;

fig. 6 is a schematic perspective view of a current collecting plate of the square aluminum-can cell of fig. 1, 2, 4 and 5;

fig. 7 is a schematic perspective view illustrating the connection of a current collecting plate and an electrode assembly of the square aluminum can battery of fig. 1, 4 and 5.

In the drawing, 1, a square aluminum-shell battery 100, a top cover plate assembly 200, a casing 300, an electrode assembly 310, a positive electrode tab 311, a negative electrode tab 400, an insulating protective layer 500, a current collecting plate 510, a negative electrode current collecting plate 511, a current collecting plate main body part 512, a current collecting plate bending part 513, a positioning hole 514, a welding hole 520, a positive electrode current collecting plate 10, a top cover plate 11, a negative electrode post leading-out hole 12, an explosion-proof valve hole 13, a positive electrode boss 14, a negative electrode upper insulating part limiting groove 20, a negative electrode post assembly 21, a terminal plate 22, an upper insulating part 23, a sealing ring 24, a negative electrode post 25, a lower insulating part 30 and an explosion-proof valve.

Detailed Description

The following will further explain the embodiments of the present invention with reference to the drawings; the following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention; in the drawings and the following description, at least some well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention, and the dimensions of some of the structures may be exaggerated for clarity; the same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted; furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As shown in fig. 1, a prismatic aluminum can battery 1 includes a top cap plate assembly 100, a case 200, and an electrode assembly 300, an insulating protective layer 400, and a current collecting plate 500 inside the case 200.

For better effect, the case 200 is made of an aluminum alloy material, and the case 200 has a rectangular box shape and is provided with an opening through which an accommodation space inside thereof can be communicated.

For better effect, the electrode assembly 300 is formed by winding together a positive electrode tab, a negative electrode tab, and a separator, wherein the separator is a film-like insulator interposed between the positive electrode tab and the negative electrode tab, and further, a positive electrode tab active material may be coated on a coating region of the positive electrode tab, a negative electrode tab active material may be coated on a coating region of the negative electrode tab, a portion extending from the coating region of the positive electrode tab serves as a positive electrode tab 310, and a portion extending from the coating region of the negative electrode tab serves as a negative electrode tab 311.

For better effect, the insulating shield layer 400 is a thin film type shield layer composed of an insulating material, and is formed to have a receiving space adapted to the contour of the electrode assembly 300, so as to maintain electrical insulation between the electrode assembly 300 and the inner wall of the case 200 by covering the insulating shield layer 400 at the outer circumference of the electrode assembly 300.

As shown in fig. 2 to 4, the top cap assembly 100 is used to seal the case 200 to seal the electrode assembly 300 within the case 200, and the top cap assembly 100 includes a top cap plate 10, a negative electrode post assembly 20, and an explosion-proof valve 30.

For better effect, the top cover plate 10 is a strip-shaped thin plate, and the external dimension matches with the opening of the casing 200, so as to be connected to the opening of the casing 200, the top cover plate 10 is made of an aluminum alloy material, in this embodiment, the top cover plate 10 is provided with a cathode pole leading-out hole 11, an insulation piece limiting groove 14 on the cathode, an explosion-proof valve hole 12 and an anode boss 13.

As shown in fig. 2 and 4, the negative pole post assembly 20 is composed of an upper insulating member 22, a terminal plate 21, a negative pole post 24, a sealing ring 23 and a lower insulating member 25, the terminal plate 21 is square and has a central hole, the terminal plate 21 is made of aluminum alloy, the terminal plate 21 is connected with the negative pole post 24 through press riveting and welding, and the upper insulating member 22 is positioned between the terminal plate 21 and the top cover plate 10 and plays an insulating role; wherein, an upper cathode insulating part limiting groove 14 is arranged around the cathode pole leading-out hole 11 of the top cover plate 10, the upper cathode insulating part limiting groove 14 corresponds to the protruding structure of the upper insulating part 22 of the cathode pole assembly 20, and the rotation of the terminal plate 21 and the cathode pole 24 can be prevented by the upper cathode insulating part limiting groove 14 when the press riveting and welding are carried out; the lower insulating part 25 is positioned between the lower end face of the cathode pole 24 and the top cover plate 10 and plays an insulating role; the sealing ring 23 is located between the cathode pole 24 and the top cover plate 10, the sealing ring 23 is made of fluororubber, and the sealing ring 23 is compressed to a certain degree through preset prepressing to play insulating and sealing roles.

As shown in fig. 2 and 4, the explosion-proof valve hole 12 is formed on the top cover plate 10 according to a predetermined size, so that after the opening of the top cover plate 10 and the housing 200 are hermetically welded, electrolyte can be injected into the accommodating space of the housing 200 through the explosion-proof valve hole 12, and the hole simultaneously plays a role of injecting liquid and connecting and fixing the explosion-proof valve; when the internal pressure of the square aluminum-casing battery becomes excessive due to gas generation caused by overcharge, overdischarge, or overheating of the battery, the explosion-proof valve 30 is broken, so that the gas formed inside the square aluminum-casing battery 1 is discharged to the outside through the explosion-proof valve hole 12, whereby the square aluminum-casing battery 1 can be prevented from exploding.

As shown in fig. 2, 3 and 4, the top cover plate 10 is provided with a positive electrode boss 13 at a position corresponding to the negative electrode post lead-out hole 11, the positive electrode boss 13 has a square structure and is formed by press molding with a die, the positive electrode boss 13 serves as a positive electrode lead-out, and the positive electrode boss 13 can be connected in series with other batteries.

As shown in fig. 6 and 7, the current collecting plate 500 includes an anode current collecting plate 510 and a cathode current collecting plate 520, the anode current collecting plate 520 is shown as an example, the material of the anode current collecting plate 510 is T2 red copper, and includes a current collecting plate main body portion 511 and a current collecting plate bending portion 512, wherein the current collecting plate main body portion 511 is provided with a positioning hole 513 and a welding hole 514, the current collecting plate main body portion 511 is located below the lower insulating member 25 and is connected and fixed with the anode pole 24 through the positioning hole 513 and the welding hole 514, the current collecting plate bending portion 512 is connected and fixed with the anode pole tab 311 in the electrode assembly 300, and the current collecting plate bending portion 512 in the anode current collecting plate 510 can be designed according to the actual current magnitude; if the overcurrent current is large, in order to reduce the temperature rise of the battery during use, the bent part 512 of the current collecting plate can be folded in half to shunt current; the positive current collecting plate 520 comprises a current collecting plate main body part 511 and a current collecting plate bending part 512 connected with the current collecting plate main body part 511, the current collecting plate main body part 511 is located on one side of the top cover plate 10 and is directly and fixedly connected with the top cover plate 10, the current collecting plate bending part 512 is located on one side far away from the top cover plate 10 and is fixedly connected with a positive pole lug 310 of the electrode assembly 300, and the connection between the positive current collecting plate 520 and the positive pole lug 310 is one of laser welding, resistance welding or ultrasonic welding.

For better effect, the current collecting plate main body portion 511 and the current collecting plate bending portion 512 of the positive current collecting plate 520 are integrally formed, and the current collecting plate main body portion 511 and the current collecting plate bending portion 512 of the negative current collecting plate 510 are integrally formed.

For better effect, the collector plate bending portion 512 of the anode collector plate 520 is formed by two-part folding, and the collector plate bending portion 512 of the cathode collector plate 510 is formed by two-part folding, so that shunting can be performed, and temperature rise of the battery during use is reduced.

The utility model also provides a battery module, it includes busbar and above-mentioned embodiment square aluminum hull battery 1, the busbar welding is in on square aluminum hull battery 1's the anodal boss 13 and the negative pole post 24, the material of busbar with the material of terminal block 21 has the same base member metal.

The utility model provides a square aluminum hull battery 1 can circulate and carry out the charge-discharge operation to in square aluminum hull battery 1 carry out repetitious usage, and the embodiment of the utility model provides a square aluminum hull battery 1 through reducing anodal utmost point post subassembly, with anodal current collector 520 lug connection to roof plate 10 on, reach the weight that reduces square aluminum hull battery 1 and battery module, improve the energy density of square aluminum hull battery 1 and battery module, also reached the purpose that reduces square aluminum hull battery 1 and battery module cost simultaneously.

It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A square aluminum-shell battery comprises a top cover plate assembly, a shell, an electrode assembly and a current collecting plate, and is characterized in that: the shell is provided with an opening, the electrode assembly is accommodated in the shell and comprises an anode tab and a cathode tab, the top cover plate assembly comprises a top cover plate and a cathode post assembly, a cathode post leading-out hole is formed in the top cover plate, the cathode post assembly comprises a terminal plate and a cathode post, the terminal plate is connected with the cathode post, the terminal plate is arranged on one side of the top cover plate and covers the cathode post leading-out hole, an anode boss is arranged on the top cover plate at a position corresponding to the cathode post leading-out hole and is integrally formed by die stamping, the current collecting plate comprises an anode current collecting plate and a cathode current collecting plate, the anode current collecting plate comprises a current collecting plate main body part and a current collecting plate bending part connected with the current collecting plate main body part, and the current collecting plate main part of the anode current collecting plate is arranged on one side of the top cover plate and is connected with the top cover plate, the current collecting plate bending part of the anode current collecting plate is located on one side, away from the top cover plate, of the anode tab of the electrode assembly, the cathode current collecting plate comprises a current collecting plate main body part and a current collecting plate bending part connected with the current collecting plate main body part, the current collecting plate main body part of the cathode current collecting plate is located on one side of the top cover plate and is connected with the cathode pole, and the current collecting plate bending part of the cathode current collecting plate is located on one side, away from the top cover plate, of the cathode tab of the electrode assembly and is connected with the cathode tab of the electrode assembly.

2. A prismatic aluminum cell in accordance with claim 1, wherein: the anode collector plate is characterized in that the collector plate main body part of the anode collector plate and the collector plate bending part are of an integral structure and are formed at one time, the collector plate main body part of the cathode collector plate and the collector plate bending part are of an integral structure and are formed at one time, and the cathode collector plate is provided with a positioning hole and a welding hole which are used for connecting a cathode pole.

3. A prismatic aluminum cell in accordance with claim 1, wherein: the cathode pole assembly further comprises an upper insulating part and a lower insulating part, and the upper insulating part and the lower insulating part are respectively fixed on the top surface and the lower surface of the top cover plate through the cathode pole.

4. A prismatic aluminum cell in accordance with claim 1, wherein: the negative pole post assembly further comprises a sealing ring for preventing the electrolyte from leaking, and the sealing ring is arranged between the negative pole post and the top cover plate.

5. A prismatic aluminum cell in accordance with claim 3, wherein: and an upper insulating part limiting groove of the negative electrode is formed around the negative electrode pole leading-out hole of the top cover plate, and corresponds to the upper insulating part of the negative electrode pole component.

6. A prismatic aluminum cell in accordance with claim 1, wherein: and the top cover plate is provided with an explosion-proof valve hole for fixedly connecting the explosion-proof valve with the liquid injection.

7. A prismatic aluminum cell in accordance with claim 1, wherein: the collector plate bending part of the anode collector plate is formed by folding two parts in half, and the collector plate bending part of the cathode collector plate is formed by folding two parts in half.

8. The utility model provides a battery module, it includes busbar and square aluminum hull battery, its characterized in that: the square aluminum-shell battery is the square aluminum-shell battery as claimed in any one of claims 1 to 7, and the reflux bar is welded on the positive electrode boss and the negative electrode post of the square aluminum-shell battery.