CN205828564U - A kind of low-cost aluminum structure lithium ion battery - Google Patents

Abstract

The utility model discloses a low-cost aluminum structure lithium ion battery, which comprises an aluminum case, a lithium ion cell, a negative electrode confluence plate, a positive electrode cover plate and a negative electrode cover plate; The positive and negative electrode cover plates are also provided with electrode contact terminals; the utility model has a simple structure, the negative electrode cover plate is directly welded to the negative electrode collector plate, the negative electrode collector plate is welded to the negative electrode ear of the battery cell, the positive electrode of the battery cell is welded to the bottom of the aluminum shell, and the negative electrode is welded to the bottom of the aluminum shell. The cover and the aluminum shell are sealed and welded, and the positive and negative cover plates are directly sealed and welded to the aluminum shell. The production steps are very simple, and there are fewer lithium-ion battery accessories, which can reduce the internal resistance of the lithium-ion battery; at the same time, the positive and negative cover plates are made of aluminum. , the welding speed can be increased during assembly, and the production cost can also be reduced; there is also a change in the pure aluminized structure, which makes the liquid injection method also change. Solve problems such as welding battery scrapping, and improve the production qualification rate.

Description

A low-cost aluminum structure lithium-ion battery

technical field

The utility model belongs to the general technical field of lithium batteries, in particular to a low-cost aluminum structure lithium ion battery.

Background technique

With the rapid development of the lithium-ion battery industry, the performance requirements for lithium-ion are getting higher and higher. At the same time, under the pressure of market competition, the cost of lithium-ion batteries is reduced. During the operation of the vehicle, the power battery requires low heat generation and high power. At the same time, it is required to maintain the stability of the battery performance under a series of conditions such as bumps and collisions during the operation of the vehicle; in the market environment, high performance is required. Power batteries with favorable prices will drive the industry forward; the combination of the two requires technological breakthroughs.

Utility model content

The purpose of the utility model is to provide a low-cost aluminum structure lithium-ion battery with simple structure, convenient use and reasonable design in view of the deficiencies of the prior art.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a low-cost aluminum structure lithium-ion battery, and its innovation point is that it includes an aluminum shell, a lithium-ion battery cell, a negative electrode collector plate, a positive electrode cover plate and a negative electrode cover plate The positive cover plate and the negative cover plate are respectively located at the upper and lower ends of the aluminum shell, and the positive and negative cover plates are respectively provided with electrode contact terminals;

The aluminum shell is provided with upper and lower cavities and interlayers, and the interlayer is provided with a liquid injection hole, and the upper cavity of the aluminum shell is sequentially connected with a lithium-ion battery cell, a negative electrode collector plate, and a negative electrode cover plate from bottom to top, The negative cover plate is sealed and welded with the aluminum shell, the positive cover plate is arranged on the lower cavity of the aluminum shell, and is sealed and welded with the aluminum shell, and the positive cover plate is also provided with an explosion-proof valve, a liquid injection hole, a sealing ball and screws.

Further, the positive cover plate is made of pure aluminum, the negative cover plate is a rivet structure, and the negative cover plate is made of copper rivets, copper connecting pieces, aluminum sheets, electrode contact terminals and sealing fittings combined with rivets.

Further, the connection sealing method between the negative electrode cover plate and the aluminum shell is laser continuous welding, the connection method between the negative electrode cover plate and the negative electrode bus plate is laser spot welding, and the negative electrode bus plate and the lithium ion battery The core negative electrode is connected by laser spot welding, the positive electrode of the lithium ion battery and the bottom end of the aluminum shell are connected by laser spot welding, and the connection and sealing method between the positive electrode cover plate and the aluminum shell is For continuous laser welding.

The beneficial effects of the utility model are as follows: the utility model has a simple structure, the negative electrode cover plate is directly welded to the negative electrode confluence plate, the negative electrode confluence plate is welded to the negative electrode lug of the battery cell, the positive electrode of the battery cell is welded to the bottom of the aluminum shell, and the negative electrode cover is sealed and welded to the aluminum shell. The positive and negative cover plates are directly sealed and welded with the aluminum shell, the production steps are very simple, and the lithium-ion battery has fewer accessories, which can reduce the internal resistance of the lithium-ion battery; at the same time, the positive and negative cover plates are processed with aluminum material, which can increase the welding speed during assembly , and can also reduce production costs; there is also a change in the pure aluminum structure, which makes the liquid injection method also change. First, the positive electrode cover plate and the aluminum shell are welded, and then the liquid is injected and the battery is sealed, which reduces the scrapping of the welded battery and improves the battery life. Production pass rate.

Description of drawings

Fig. 1 is the structural representation of the utility model.

detailed description

The implementation of the present utility model is illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

As shown in Figure 1, it is a schematic structural view of the utility model, a low-cost aluminum structure lithium-ion battery, including an aluminum shell 4, a lithium-ion battery cell 3, a negative electrode bus plate 2, a positive electrode cover plate 8 and a negative electrode cover plate 1; The cover plate 8 and the negative electrode cover plate 1 are respectively located at the upper and lower ends of the aluminum shell 4, and the positive and negative electrode cover plates are respectively provided with electrode contact terminals;

The aluminum shell 4 is provided with upper and lower cavities and interlayers, and the interlayer is provided with a liquid injection hole. The upper chamber 9 of the aluminum shell 4 is connected to the lithium ion battery cell 3, the negative electrode collector plate 2 and the negative electrode cover plate 1 sequentially from bottom to top. The negative cover plate 1 is sealed and welded with the aluminum shell 4, the positive cover plate 8 is arranged on the lower cavity of the aluminum shell 4, and is sealed and welded with the aluminum shell 4, and the positive cover plate 8 is also provided with an explosion-proof valve 12 and a liquid injection hole 10, Seal ball 11 and screw 13.

The positive cover plate 8 is made of pure aluminum, the negative cover plate 1 is a rivet structure, and the negative cover plate 1 is made of copper rivets, copper connecting pieces, aluminum sheets, electrode contact terminals and sealing accessories combined with rivets.

The connection and sealing method between the negative electrode cover plate 1 and the aluminum shell 4 is laser continuous welding, the connection method between the negative electrode cover plate 1 and the negative electrode collector plate 2 is laser spot welding, and the connection between the negative electrode collector plate 2 and the negative electrode of the lithium ion battery cell 3 is The laser spot welding method is used to connect the lithium-ion cell 3 positive electrode and the bottom end of the aluminum shell 4. The laser spot welding method is used to connect the positive electrode cover plate 8 and the aluminum shell 4. welding.

The utility model has a simple structure, the negative electrode cover plate 1 is directly welded to the negative electrode confluence plate 2, the negative electrode confluence plate 2 is welded to the negative electrode lug of the battery cell, the positive electrode of the battery cell 3 is welded to the bottom of the aluminum shell 4, and the negative electrode cover plate 1 is welded to the aluminum shell 4. The positive and negative electrode covers 8 are directly sealed and welded with the aluminum shell 4. The production steps are very simple, and the lithium-ion battery has fewer accessories, which can reduce the internal resistance of the lithium-ion battery. speed, and can also reduce production costs; there is also a change in the pure aluminum structure, which makes the liquid injection method also change, first welding the positive cover plate 8 and the aluminum shell 4, and then injecting liquid and sealing the battery, reducing the scrapping of the welded battery, etc. Problems, improve production pass rate.

Working principle: Negative electrode cover plate 1 is connected with negative electrode manifold 2 by laser spot welding, negative electrode manifold 2 is connected with battery cell 3 by laser spot welding, battery cell 3 is connected with cavity interlayer 6 by laser spot welding; negative electrode cover plate 1 is put into aluminum The upper cavity 7 of the shell is sealed with the aluminum shell 4 by laser continuous welding, the positive cover plate 8 is placed in the lower cavity 7 of the aluminum shell, sealed with the aluminum shell 4 by laser continuous welding, and finally the positive cover plate 8 is placed in the aluminum shell Place the cavity 7 below, seal the positive electrode cover plate 6 and the aluminum shell 4 by laser welding, inject the electrolyte from the liquid injection hole 10, and pass through the interlayer liquid injection hole 5. When the liquid injection volume reaches the standard, put it into the sealed ball 11, and then screw 13.

The above-described embodiments are only preferred embodiments of the present utility model, and are not limitations to the technical solutions of the present utility model. As long as the technical solutions that can be realized on the basis of the above-mentioned embodiments without creative work, all should be regarded as falling into the scope of this invention. within the protection scope of utility model patents.

Claims (3)

1. a low-cost aluminum structure lithium ion battery, it is characterised in that: include aluminum hull, lithium-ion electric core, negative pole conflux disk, just Polar cap plate and negative pole cover plate；Described positive pole cover plate and negative pole cover plate lay respectively at the two ends up and down of aluminum hull, described both positive and negative polarity cover plate On further respectively have contact terminal；

Be provided with upper and lower cavity and interlayer in described aluminum hull, described interlayer be provided with liquid injection hole, on described aluminum hull intracavity under Supreme lithium-ion electric core, negative pole conflux disk and the negative pole cover plate of being sequentially connected with, described negative pole cover plate and aluminum hull seal and weld, described just Polar cap plate is arranged under aluminum hull on accent, and welds with aluminum hull sealing, and described positive pole cover plate is additionally provided with explosion-proof valve, fluid injection Aperture, ball sealer and screw.

A kind of low-cost aluminum structure lithium ion battery the most according to claim 1, it is characterised in that: described positive pole cover plate is Pure aluminum material, described negative pole cover plate is rivet arrangement, and described negative pole cover plate uses copper rivet, copper to connect sheet, aluminium flake and electrode and connects Contravention and seal fitting combined rivet form.

A kind of low-cost aluminum structure lithium ion battery the most according to claim 1, it is characterised in that: described negative pole cover plate with Connection sealing means between aluminum hull is that laser welds continuously, and the connected mode between described negative pole cover plate and negative pole conflux disk is Laser spots is welded, and the mode taking laser spots to weld between described negative pole conflux disk and lithium-ion electric core negative pole is attached, institute State the mode taking laser spots to weld between lithium-ion electric core positive pole with aluminum hull bottom to be attached, described positive pole cover plate and aluminum hull Between connection sealing means be that laser welds continuously.