CN211957818U

CN211957818U - Heap lithium ion battery structure

Info

Publication number: CN211957818U
Application number: CN202020551029.XU
Authority: CN
Inventors: 赵恒�
Original assignee: Guangdong An Energy Technology Co ltd
Current assignee: Guangdong An Energy Technology Co ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-11-17
Anticipated expiration: 2030-04-14

Abstract

The utility model provides a stacked lithium ion battery structure, wherein an electric core is arranged in a shell, the electric core comprises a folded diaphragm, and the folded diaphragm forms n first holding tanks and n second holding tanks; each first accommodating groove is internally provided with a positive plate, and the same side of each positive plate is connected with a positive electrode connecting and inserting piece; each second accommodating groove is internally provided with a negative plate, and the same side of each negative plate is connected with a negative electrode inserting piece; the diaphragm sheet comprises a polypropylene diaphragm and n +1 groups of ceramic reinforcing layers which are arranged at intervals; a positive lug is fixed on the first insulating sealing cover, and a positive slot is arranged on one side of the first insulating sealing cover, which is close to the battery core; and a negative electrode lug is fixed on the second insulating sealing cover, and a negative electrode slot is arranged on one side of the second insulating sealing cover, which is close to the battery core. The utility model discloses circuitous folding diaphragm has good short circuit performance of preventing, and special diaphragm stable in structure is firm, folding convenient, and has good heat resistance, equipment convenient operation.

Description

Heap lithium ion battery structure

Technical Field

The utility model relates to a lithium ion battery specifically discloses a heap lithium ion battery structure.

Background

The lithium ion battery is widely applied, and in the battery core of the lithium ion battery, the positive and negative pole pieces are relatively compact in position, so that the positive and negative pole pieces are easily short-circuited once misoperation or failure occurs during manufacturing, and the performance of the lithium ion battery is influenced.

In the prior art, a lithium ion battery generally uses a diaphragm to separate positive and negative pole pieces, then obtains a battery cell in a laminating or winding manner, and finally puts the battery cell into a battery shell for sealing and forming. The battery core is manufactured in a laminating mode, a thick plate-shaped structure is easy to obtain, however, the assembly operation is complex, the lithium ion battery in the prior art is poor in heat resistance, when the lithium ion battery works at a large current or is short-circuited, the lithium ion battery is easy to generate heat and bulge, and particularly when the lithium ion battery is applied to a high-power lithium ion battery, serious potential safety hazards can be formed once the short circuit occurs.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a stacked lithium ion battery structure with convenient assembly and operation and good short-circuit prevention performance for solving the problems in the prior art.

In order to solve the prior art problem, the utility model discloses a stacked lithium ion battery structure, which comprises a shell, wherein an electric core is arranged in the shell, the electric core comprises a diaphragm folded in a Z shape, the folded diaphragm forms n first holding tanks and n second holding tanks, n is an integer greater than 1, the opening of the first holding tank is opposite to the opening of the second holding tank, and a first insulating sealing cover and a second insulating sealing cover are respectively fixed at two ends of the shell;

each first accommodating groove is internally provided with a positive plate, the same side of each positive plate is connected with a positive connecting plate, and one side of each positive connecting plate, which is far away from the diaphragm plate, is fixedly provided with a positive connecting and inserting plate;

each second accommodating groove is internally provided with a negative plate, the same side of each negative plate is connected with a negative connecting plate, and the side of each negative connecting plate, which is far away from the diaphragm, is fixedly provided with a negative connecting and inserting plate;

the diaphragm sheet comprises a polypropylene diaphragm and n +1 groups of ceramic reinforcing layers which are arranged at intervals, the ceramic reinforcing layers are fixed on the surface of the polypropylene diaphragm, the ceramic reinforcing layers are opposite to the side surfaces of the positive plate or the negative plate, and a plurality of abdicating micropores are arranged in the ceramic reinforcing layers;

a positive electrode lug is fixed on one side, away from the battery cell, of the first insulating sealing cover, a positive electrode slot is formed in one side, close to the battery cell, of the first insulating sealing cover, a first conductive silver glue layer covers the inner wall of the positive electrode slot, the first conductive silver glue layer is connected with the positive electrode lug, a positive electrode inserting sheet is located in the positive electrode slot, and the positive electrode inserting sheet is in contact connection with the first conductive silver glue layer;

one side that the sealed lid of second insulation is kept away from electric core is fixed with the negative pole ear, and one side that the sealed lid of second insulation is close to electric core is equipped with the negative pole slot, and the inner wall of negative pole slot covers has the second conductive silver glue film, and the second conductive silver glue film is connected with the negative pole ear, and the negative pole connects the inserted sheet to be located the negative pole slot, and the negative pole connects the inserted sheet to be connected with the contact of second conductive silver glue film.

Further, the shell comprises an aluminum shell, and the inner wall of the aluminum shell is covered with an insulating layer.

Furthermore, a plurality of liquid absorption convex strips are integrally formed on the surface of the polypropylene diaphragm and are positioned between the polypropylene diaphragm and the ceramic reinforcing layer.

Further, the ceramic reinforcing layer is a zirconia coating.

Furthermore, the aperture size of the abdicating micropores is 0.2-2 μm.

Furthermore, the positive electrode lug and the negative electrode lug are both I-shaped.

The utility model has the advantages that: the utility model discloses a stacked lithium ion battery structure, which can conveniently obtain a thick plate-shaped structure by manufacturing an electric core in a stacked mode, and a circuitous and folded diaphragm sheet in the electric core can effectively separate a positive plate and a negative plate, thereby effectively avoiding the contact short circuit of the positive plate and the negative plate and having good short circuit prevention performance; the special diaphragm has stable and firm structure, difficult deformation, convenient folding and good heat resistance, not only can effectively simplify the manufacturing and processing steps of the battery core, but also can effectively improve the safety performance and the service life of the battery; the pole piece and the pole lug in the battery core are communicated in a plugging mode, the assembly operation is convenient, and the liquid leakage prevention performance of the whole structure is good.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic layer structure of the middle diaphragm of the present invention.

The reference signs are: the battery comprises a shell 10, an aluminum shell 11, an insulating layer 12, a battery cell 20, a diaphragm sheet 21, a first accommodating groove 21A, a second accommodating groove 21B, a polypropylene diaphragm 211, a liquid absorption convex strip 2111, a ceramic reinforcing layer 212, an abdication micropore 2121, a positive plate 22, a positive connecting sheet 221, a positive connecting inserting sheet 222, a negative plate 23, a negative connecting sheet 231, a negative connecting inserting sheet 232, a first insulating sealing cover 30, a positive lug 31, a positive inserting groove 32, a first conductive silver glue layer 33, a second insulating sealing cover 40, a negative lug 41, a negative inserting groove 42 and a second conductive silver glue layer 43.

Detailed Description

For further understanding of the features and technical means of the present invention, as well as the specific objects and functions attained by the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

Refer to fig. 1 and 2.

The embodiment of the utility model discloses heap lithium ion battery structure, including shell 10, be equipped with electric core 20 in the shell 10, still fill electrolyte in the shell 10, electric core 20 is including being the circuitous folding diaphragm piece 21 of Z style of calligraphy, and folding diaphragm piece 21 forms n first holding tank 21A and n second holding tank 21B, and n is the integer that is greater than 1, and the opening of first holding tank 21A is back to the opening of second holding tank 21B, and the both ends of shell 10 are fixed with first insulating seal lid 30 and second insulating seal lid 40 respectively;

each first accommodating groove 21A is provided with a positive plate 22, the same side of each positive plate 22 is connected with the same positive connecting plate 221, and the side of each positive connecting plate 221, which is far away from the diaphragm 21, is fixedly provided with a positive connecting insertion piece 222;

each second accommodating groove 21B is provided with a negative plate 23, the same side of each negative plate 23 is connected with the same negative communicating plate 231, the positive communicating plate 221 and the negative communicating plate 231 are respectively positioned at the two opposite ends of the integral diaphragm 21, one side of the negative communicating plate 231, which is far away from the diaphragm 21, is fixed with a negative connecting and inserting plate 232, the positive plate 22 and the negative plate 23 are respectively accommodated in the two accommodating grooves with the opposite opening directions, so that the contact short circuit of the positive plate 22 and the negative plate 23 can be effectively avoided, the reliability of the overall structure of the lithium ion battery can be effectively improved, the current collecting effect is good, and the structure is firm and stable;

the diaphragm sheet 21 comprises a polypropylene diaphragm 211 and n +1 groups of ceramic reinforcing layers 212 which are arranged at intervals, namely gaps are formed among the ceramic reinforcing layers 212 and are not in contact with each other, the diaphragm sheet 21 can be conveniently folded, the polypropylene diaphragm 211 is of a battery diaphragm structure with high porosity and ionic conductivity, the ceramic reinforcing layers 212 are fixed on the surface of the polypropylene diaphragm 211, the battery core 20 can be reinforced through the ceramic reinforcing layers 212, the structure of the battery core 20 is stable and reliable, the heat dissipation performance of the lithium ion battery and the liquid hanging capacity of electrolyte can be effectively improved, the safety performance and the service life of the lithium ion battery are effectively improved, the ceramic reinforcing layers 212 are right opposite to the side faces of the positive plate 22 or the negative plate 23, and a plurality of abdicating micropores 2121 are formed in the ceramic reinforcing layers 212 and are used for lithium ions to smoothly pass through;

a positive tab 31 is fixed on one side, away from the battery cell 20, of the first insulating sealing cover 30, a positive slot 32 is arranged on one side, close to the battery cell 20, of the first insulating sealing cover 30, a first conductive silver glue layer 33 covers the inner wall of the positive slot 32, the first conductive silver glue layer 33 is connected with the positive tab 31, the positive tab 222 is located in the positive slot 32, the positive tab 222 is in contact connection with the first conductive silver glue layer 33, the conductive silver glue has good conductivity, high friction coefficient and good elasticity, the first conductive silver glue layer 33 can effectively improve the limit stability of the positive tab 222, reliable communication between the positive tab 222 and the positive tab 31 can be effectively ensured, and the first conductive silver glue layer 33 can effectively avoid electrolyte from leaking through the connection part of the positive slot 32 and the positive tab 31;

a negative electrode lug 41 is fixed on one side of the second insulating sealing cover 40 far away from the battery core 20, a negative electrode slot 42 is arranged on one side of the second insulating sealing cover 40 near the battery core 20, a second conductive silver glue layer 43 covers the inner wall of the negative electrode slot 42, the second conductive silver glue layer 43 is connected with the negative electrode lug 41, a negative electrode inserting sheet 232 is positioned in the negative electrode slot 42, the negative electrode inserting sheet 232 is in contact connection with the second conductive silver glue layer 43, the conductive silver glue has good conductivity, higher friction coefficient and good elasticity, the second conductive silver glue layer 43 can effectively improve the limit stability of the negative electrode inserting sheet 232, can effectively ensure the reliable communication between the negative electrode inserting sheet 232 and the negative electrode lug 41, the second conductive silver glue layer 43 can effectively avoid the electrolyte from leaking through the connection part of the negative electrode slot 42 and the negative electrode lug 41, and the lug in the battery core 20 is indirectly communicated with the lug through the inserting sheet and the slot, the assembly operation is convenient.

Before assembling, firstly, the battery cell 20 is manufactured, one of the insulating sealing covers is inserted from one end of the shell 10, the shell 10 and the insulating sealing cover at the end are sealed and fixed in a glue bonding mode and the like, then, the battery cell 20 is placed into the shell 10, one of the inserting plates is inserted into the corresponding slot, the communication between the electrode plate and the electrode lug is realized, electrolyte is injected into the shell 10 from the opening at the other end of the shell 10, the other insulating sealing cover is sealed and fixed in the opening of the shell 10 in a glue bonding mode and the like, the other inserting plate is inserted into the corresponding slot, the other electrode plate is communicated with the corresponding electrode lug, the manufacturing steps are simple and convenient, and each connecting structure of the lithium ion battery is reliable and effective.

In the present embodiment, the housing 10 includes an aluminum shell 11, and the inner wall of the aluminum shell 11 is covered with an insulating layer 12, preferably, the insulating layer 12 may be a PE film, which is called polyethylene and is a thermoplastic resin, which can effectively prevent the conductive structure inside the aluminum shell 11 from being short-circuited.

In this embodiment, a plurality of liquid absorption convex strips 2111 which are uniformly distributed are integrally formed on the surface of the polypropylene diaphragm 211, the liquid absorption convex strips 2111 are located between the polypropylene diaphragm 211 and the ceramic reinforcing layer 212, and the liquid absorption convex strips 2111 can effectively improve the liquid hanging adsorption capacity of the polypropylene diaphragm 211, can effectively improve the content of electrolyte in the battery cell 20, and thus can effectively improve the ionic conductivity.

In this embodiment, the ceramic reinforcing layer 212 is a zirconia coating, and the zirconia is also called zirconia, which has the advantages of high temperature resistance, insulation, and the like, and the zirconia coating can effectively improve the heat resistance and mechanical strength of the overall structure of the battery cell 20, can effectively prevent explosion at high temperature, and has good safety performance.

In the present embodiment, the diameter of the abdicating micropores 2121 is 0.2 to 2 μm, the abdicating micropores 2121 are circular holes, and preferably, the porosity of the ceramic reinforcing layer 212 is 40 to 70%, so that the mechanical strength is enhanced and the lithium ion permeability is ensured.

In this embodiment, the positive tab 31 and the negative tab 41 are both in an i-shape, and are embedded in the insulating sealing cover through the i-shaped structure, so that the stability of the positive tab 31 in the insulating sealing cover can be effectively improved, and the stability of the negative tab 41 in the insulating sealing cover can also be effectively improved.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A stacked lithium ion battery structure comprises a shell (10), wherein a battery cell (20) is arranged in the shell (10), and the battery cell (20) comprises a diaphragm sheet (21) folded in a Z shape, the folded diaphragm sheet (21) forms n first accommodating grooves (21A) and n second accommodating grooves (21B), n is an integer larger than 1, the opening of the first accommodating groove (21A) is opposite to the opening of the second accommodating groove (21B), and a first insulating sealing cover (30) and a second insulating sealing cover (40) are respectively fixed at two ends of the shell (10);

each first accommodating groove (21A) is internally provided with a positive plate (22), the same side of each positive plate (22) is connected with a positive connecting plate (221), and a positive connecting inserting piece (222) is fixed on one side, far away from the diaphragm plate (21), of each positive connecting plate (221);

each second accommodating groove (21B) is internally provided with a negative plate (23), the same side of each negative plate (23) is connected with a negative communicating plate (231), and a negative connecting inserting piece (232) is fixed on one side, far away from the diaphragm (21), of each negative communicating plate (231);

the separator sheet (21) comprises a polypropylene separator (211) and n +1 groups of ceramic reinforcing layers (212) which are arranged at intervals, the ceramic reinforcing layers (212) are fixed on the surface of the polypropylene separator (211), the ceramic reinforcing layers (212) are opposite to the side surfaces of the positive electrode sheet (22) or the negative electrode sheet (23), and a plurality of abdicating micropores (2121) are formed in the ceramic reinforcing layers (212);

a positive lug (31) is fixed on one side, away from the battery core (20), of the first insulating sealing cover (30), a positive slot (32) is arranged on one side, close to the battery core (20), of the first insulating sealing cover (30), a first conductive silver adhesive layer (33) covers the inner wall of the positive slot (32), the first conductive silver adhesive layer (33) is connected with the positive lug (31), the positive electrode inserting piece (222) is located in the positive slot (32), and the positive electrode inserting piece (222) is in contact connection with the first conductive silver adhesive layer (33);

keep away from second insulating sealed lid (40) one side of electricity core (20) is fixed with negative pole ear (41), second insulating sealed lid (40) are close to one side of electricity core (20) is equipped with negative pole slot (42), the inner wall of negative pole slot (42) covers has second conductive silver glue film (43), second conductive silver glue film (43) with negative pole ear (41) are connected, the negative pole connects inserted sheet (232) to be located in negative pole slot (42), the negative pole connect inserted sheet (232) with second conductive silver glue film (43) contact is connected.

2. A stacked lithium ion battery structure according to claim 1, characterized in that the housing (10) comprises an aluminum shell (11), and the inner wall of the aluminum shell (11) is covered with an insulating layer (12).

3. The stacked lithium ion battery structure according to claim 1, wherein a plurality of liquid-absorbing ribs (2111) are integrally formed on the surface of the polypropylene separator (211), and the liquid-absorbing ribs (2111) are located between the polypropylene separator (211) and the ceramic reinforcing layer (212).

4. The stacked lithium ion battery structure of claim 1, wherein the ceramic reinforcement layer (212) is a zirconia coating.

5. The stacked lithium ion battery structure according to claim 1, wherein the aperture size of the receding micropores (2121) is 0.2-2 μm.

6. The stacked lithium ion battery structure according to claim 1, wherein the positive tab (31) and the negative tab (41) are both I-shaped.