CN218448356U

CN218448356U - Single battery and battery module

Info

Publication number: CN218448356U
Application number: CN202221730328.5U
Authority: CN
Inventors: 陈民; 王文杰; 吴华斌; 田冰冰; 李真堂
Original assignee: Guangdong Carriage Power Technology Co ltd
Current assignee: Guangdong Carriage Power Technology Co ltd
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2023-02-03
Anticipated expiration: 2032-07-06

Abstract

The utility model discloses a single battery and a battery module, wherein, the single battery comprises a shell, the upper and lower surfaces of the shell are both provided with openings, a naked battery cell is arranged in the shell, and an anode cover plate and a cathode cover plate are correspondingly arranged at the two openings of the shell; the bare cell consists of a positive plate, a solid electrolyte and a negative plate which are stacked in sequence, wherein a positive tab is arranged in the length direction of the positive plate, the width of the positive tab is 20-100% of the length of the positive plate, and a negative tab is arranged in the length direction of the negative plate, and the width of the negative tab is 20-100% of the length of the negative plate; the positive pole cover plate is provided with a positive pole column, the negative pole cover plate is provided with a negative pole column, the positive pole piece is connected with the positive pole column through a positive pole converging piece, and the negative pole piece is connected with the negative pole column through a negative pole converging piece. The utility model provides a reduced the current density of utmost point ear department of battery when high-power charge-discharge, reduced the heat production volume of battery, improved the security performance of single cell and module thereof.

Description

Single battery and battery module

Technical Field

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

Background

With the exhaustion of petrochemical energy and the enhancement of environmental awareness of people, new energy automobiles are increasingly popularized. However, the safety accident of the electric vehicle in case of fire and explosion occurs occasionally. The main reason for the fire of the electric vehicle is that heat generated by the power battery in the charging and discharging process cannot be discharged in time, and the heat accumulation causes the temperature inside the battery to be higher and higher, so that thermal runaway is caused. The existing solution is basically to add or optimize a cooling system in the battery pack to timely dissipate the heat generated by the battery. The scheme is simple in design and strong in operability, but when the battery pack is used for a long time, the risks of ageing of a cooling system, low heat removal efficiency and the like exist. In addition, when the battery is discharged in a large function, the heat generation efficiency of the battery is higher than the heat dissipation efficiency, and the battery pack still has a risk of post heat accumulation.

Accordingly, the prior art is yet to be improved and developed.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned prior art not enough, the utility model aims at providing a battery cell and battery module, it is great to aim at solving current battery heat production when high-power charge-discharge, the accumulational problem of heat appears easily.

The technical scheme of the utility model as follows:

a single battery comprises a cuboid shell, wherein the upper surface and the lower surface of the shell, which are enclosed in the length direction and the thickness direction, are provided with openings, a bare cell is arranged in the shell, and a positive cover plate and a negative cover plate are correspondingly arranged at the two openings of the shell; the bare cell comprises a positive plate, a solid electrolyte and a negative plate which are sequentially stacked, wherein a positive electrode tab is arranged in the length direction of the positive plate, the width of the positive electrode tab is 20-100% of the length of the positive plate, a negative electrode tab is arranged in the length direction of the negative plate, and the width of the negative electrode tab is 20-100% of the length of the negative plate; the positive pole cover plate is provided with a positive pole column, the negative pole cover plate is provided with a negative pole column, the positive pole piece is connected with the positive pole column through a positive pole converging piece, and the negative pole piece is connected with the negative pole column through a negative pole converging piece.

The single battery comprises a positive pole, a negative pole and a positive cover plate, wherein the size of the positive pole along the length direction of the positive cover plate accounts for 10-40% of the width of the positive pole lug, and the size of the negative pole along the length direction of the negative cover plate accounts for 10-40% of the width of the negative pole lug.

The single battery is characterized in that the anode cover plate is also provided with a liquid injection hole.

The single battery is characterized in that the negative cover plate is also provided with an explosion-proof valve.

The single battery is characterized in that the width of the positive electrode bus bar is 80-100% of the width of the positive electrode tab, and the width of the negative electrode bus bar is 80-100% of the width of the negative electrode tab.

The single battery is characterized in that the positive cover plate and the negative cover plate are welded at two openings of the shell.

A battery module comprises a module frame and a plurality of single batteries, wherein the single batteries are arranged in the module frame in a series-parallel connection mode.

Has the advantages that: the utility model provides a single battery, through optimizing just, negative pole utmost point ear, just, negative pole converge piece to and just, the structure and the relative size of negative pole utmost point post, reduced the current density of utmost point ear department when high-power charge-discharge of battery, reduced the heat production of battery, improved the security performance of single battery and module.

Drawings

Fig. 1 is the utility model provides a positive plate of battery cell and anodal utmost point ear structure sketch map.

Fig. 2 is the utility model provides a cell negative plate and negative pole utmost point ear structure sketch map.

Fig. 3 is a schematic diagram of a single battery structure provided by the present invention.

Fig. 4 is a schematic diagram of the explosion of the single battery provided by the present invention.

Fig. 5 is the utility model provides a positive plate cover structure schematic diagram.

Fig. 6 is a schematic diagram of a structure of the negative cover plate provided by the present invention.

A positive electrode plate 1; a negative pole piece 2; a housing 3; a positive pole 4; a positive electrode cover plate 5; a liquid injection hole 6; a negative electrode post 7; a negative electrode cover plate 8; an explosion-proof valve 9; a positive electrode tab 11; and a negative electrode tab 21.

Detailed Description

The utility model provides a battery cell and battery module, for making the utility model discloses a purpose, technical scheme and effect are clearer, more clear and definite, it is following right the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1 to 6, the present invention provides a single battery, as shown in the figure, the single battery includes a rectangular casing 3, an upper surface and a lower surface of the casing 3, which are enclosed in the length direction and the thickness direction, are both provided with openings, a bare cell is disposed in the casing 3, and an anode cover plate 5 and a cathode cover plate 8 are correspondingly disposed at the two openings of the casing 3; the bare cell comprises a positive plate 1, a solid electrolyte and a negative plate 2 which are sequentially stacked, wherein a positive tab 11 is arranged in the length direction of the positive plate 1, the width of the positive tab 11 is 20-100% of the length of the positive plate 1, a negative tab 21 is arranged in the length direction of the negative plate 2, and the width of the negative tab 21 is 20-100% of the length of the negative plate 2; the positive pole cover plate 5 is provided with a positive pole post 4, the negative pole cover plate 8 is provided with a negative pole post 6, the positive pole piece 1 is connected with the positive pole post 4 through a positive pole bus sheet, and the negative pole piece 2 is connected with the negative pole post 6 through a negative pole bus sheet.

In some embodiments, the housing is a cuboid having a length L, a height H, and a thickness T, wherein: l is more than or equal to 200mm and less than or equal to 800mm;10% L.ltoreq.H.ltoreq.30% L;2% L.ltoreq.T.ltoreq.10% L. In this embodiment, the dimension of the positive electrode post along the length direction of the positive electrode cover plate accounts for 10-40% of the width of the positive electrode tab, and the dimension of the negative electrode post along the length direction of the negative electrode cover plate accounts for 10-40% of the width of the negative electrode tab; the width of the positive electrode bus bar sheet is 80-100% of the width of the positive electrode lug, and the width of the negative electrode bus bar sheet is 80-100% of the width of the negative electrode lug.

The embodiment reduces the current density of the battery at the lug when the battery is charged and discharged at high power by optimizing the positive and negative lugs, the positive and negative bus bars and the structures and relative sizes of the positive and negative poles, reduces the heat production quantity of the battery and improves the safety performance of the single battery and the module thereof.

In some embodiments, the positive and negative cover plates are welded at two openings of the case.

In some embodiments, a battery module is also provided, which includes a module frame and a plurality of single batteries assembled in a series-parallel connection manner and placed in the module frame. The battery module that this embodiment provided, because of having optimized the utmost point ear of monomer battery in the module, the piece and the utmost point post size of converging has reduced the current density of utmost point ear department when high-power charge-discharge of battery, has reduced the heat production of battery, has improved the security performance of battery and module.

It should be understood that the application of the present invention is not limited to the above examples, and that modifications or changes can be made by those skilled in the art based on the above description, and all such modifications and changes are intended to fall within the scope of the appended claims.

Claims

1. A single battery is characterized by comprising a cuboid shell, wherein the upper surface and the lower surface of the shell, which are enclosed in the length direction and the thickness direction, are provided with openings, a bare cell is arranged in the shell, and a positive cover plate and a negative cover plate are correspondingly arranged at the two openings of the shell; the bare cell comprises a positive plate, a solid electrolyte and a negative plate which are sequentially stacked, wherein a positive electrode tab is arranged in the length direction of the positive plate, the width of the positive electrode tab is 20-100% of the length of the positive plate, a negative electrode tab is arranged in the length direction of the negative plate, and the width of the negative electrode tab is 20-100% of the length of the negative plate; the positive pole cover plate is provided with a positive pole column, the negative pole cover plate is provided with a negative pole column, the positive pole piece is connected with the positive pole column through a positive pole converging piece, and the negative pole piece is connected with the negative pole column through a negative pole converging piece.

2. The battery cell according to claim 1, wherein the dimension of the positive electrode post along the length direction of the positive electrode cover plate accounts for 10-40% of the width of the positive electrode tab, and the dimension of the negative electrode post along the length direction of the negative electrode cover plate accounts for 10-40% of the width of the negative electrode tab.

3. The single-cell battery according to claim 1, wherein the positive electrode cover plate is further provided with a liquid injection hole.

4. The single battery according to claim 1, wherein an explosion-proof valve is further arranged on the negative electrode cover plate.

5. The cell defined in claim 1, wherein the positive tab width is 80-100% of the positive tab width and the negative tab width is 80-100% of the negative tab width.

6. The battery cell according to claim 1, wherein the positive and negative electrode cap plates are welded at two openings of the case.

7. A battery module, characterized by comprising a module frame and a plurality of single batteries according to any one of claims 1 to 6, wherein the plurality of single batteries are arranged in the module frame in a series-parallel connection mode.