CN216818478U

CN216818478U - Pole connection structure for lithium battery cover plate

Info

Publication number: CN216818478U
Application number: CN202220519092.4U
Authority: CN
Inventors: 代德明; 崔献广; 矫贺东
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2022-06-24
Anticipated expiration: 2032-03-10

Abstract

A pole connection structure for a lithium battery cover plate comprises a top cover plate, a positive pole and a negative pole, wherein the top cover plate is provided with a positive pole through hole and a negative pole through hole, and the negative pole is welded with the negative pole through hole through a metal ceramic composite ring; the metal ceramic composite ring comprises a ceramic ring, a copper composite ring is arranged on the inner periphery of the ceramic ring, and an aluminum composite ring is arranged on the outer periphery of the ceramic ring; the inner circumference of the copper composite ring is welded with the negative pole column, and the outer circumference of the aluminum composite ring is welded with the through hole of the negative pole column. The negative pole post is welded with the through hole of the negative pole post through the metal ceramic composite ring, and the ceramic ring in the metal ceramic composite ring ensures the insulation between the negative pole post and the top cover plate; the copper composite ring and the aluminum composite ring are electroplated or poured on the ceramic ring, the inner periphery of the copper composite ring is welded with the negative pole column, and the outer periphery of the aluminum composite ring is welded with the through hole of the negative pole column, so that the sealing between the negative pole column and the top cover plate is ensured. The utility model has simple structure and simple manufacturing process, and can reduce the cost of the top cover and further reduce the cost of the battery.

Description

Pole connection structure for lithium battery cover plate

Technical Field

The utility model belongs to the technical field of a pole for a lithium battery cover plate, and particularly relates to a pole connecting structure for a lithium battery cover plate.

Background

As an energy storage unit, a battery is increasingly widely used in the electric vehicle industry and the energy storage industry, wherein a square aluminum-shell battery is dominant. The battery top cover used in the market at present has a complex structure, a plurality of manufacturing procedures and difficulty in reducing the cost of the top cover. The existing top cover structure mainly has the following schemes:

scheme 1: the top cover structure comprises an anode post, a cathode post, a sealing ring, a top cover plate, a stainless steel clamp spring, a ceramic ring and anti-rotation ceramic, wherein the anode post is machined, the lower part of the cathode post is made of aluminum (machined after copper-aluminum friction welding), grooves are machined in the upper parts of the anode post and the cathode post, grooves are machined in the lower parts of the anode post and the cathode post, through holes are formed in the positions, corresponding to the anode post and the cathode post, of the top cover plate, and grooves are machined in the positions, corresponding to the ceramic, of the top cover plate. The top cap assembling mode is as follows: the sealing ring is sleeved in the pole, the anti-rotation ceramic is placed in the grooves at the lower parts of the positive and negative poles, the combined body penetrates through the through holes at the positions, corresponding to the positive and negative poles, of the top cover plate from the lower part of the top cover plate, the ceramic ring is sleeved at the upper parts of the positive and negative poles above the top cover plate, and the stainless steel clamp spring is embedded in the grooves at the upper parts of the positive and negative poles and tightly presses the ceramic ring. The structure uses most parts and the assembly process is most complicated.

Scheme 2: the top cover structure comprises an anode post, a cathode post, a sealing ring, a top cover plate and a PPS casting piece, wherein the anode post is machined, the upper part of the cathode post is made of aluminum, the lower part of the cathode post is made of copper (machined after copper-aluminum friction welding), grooves are machined on the upper parts of positive and negative poles, anti-rotation embossing textures are machined, and through holes are formed in the positions, corresponding to the positive and negative poles, of the top cover plate. The assembly method is to sleeve the sealing ring into the pole, penetrate the assembly into the through holes corresponding to the positive and negative poles from the lower part of the top cover plate, fix the position of the assembly by using a mould, and pour PPS into the space between the periphery of the cylindrical surface of the pole and the through hole of the top cover plate. Compared with scheme 1, the scheme has the advantages that the number of parts and the manufacturing process are reduced, but the scheme is not a better scheme.

Scheme 3: the top cap structure constitutes to the positive post, the negative pole post, the sealing washer, the top cap piece, compound briquetting of aluminium-plastic, wherein the positive post uses aluminum plate stamping forming (adding the mode more efficiently than the machine, with low costs), wherein the negative pole post uses copper aluminium composite sheet to carry out stamping forming (adding the mode more efficiently than friction weld back machine, with low costs), aluminium structure in the compound piece of aluminium-plastic adopts to place after stamping forming and pours PPS plastics into a mould and forms an organic whole structure, compound briquetting periphery of aluminium-plastic is naked aluminium material, the through-hole (through-hole diameter ratio utmost point post diameter and sealing washer internal diameter are little) is opened at the position that corresponds positive negative utmost point post to the top cap piece. The assembly method is as follows: the sealing ring is arranged between the upper side of the periphery of the through hole of the top cover plate and the lower end of the pole column, the aluminum-plastic composite block which is prepared in advance is pressed above the pole column and presses the pole column downwards, so that the sealing ring is compressed to achieve sealing, and the exposed aluminum material part of the periphery of the aluminum-plastic composite pressing block is welded with the top cover plate. Compared with the scheme 2, the pole with the structure has the advantages that the plate is punched and formed without any processing, the cost of the pole can be reduced, and the cost of the top cover is reduced.

The existing technical scheme has the disadvantages of complex structure, multiple manufacturing procedures and high top cover cost.

SUMMERY OF THE UTILITY MODEL

The utility model provides the pole connecting structure for the lithium battery cover plate, aiming at solving the problems, the utility model has the advantages of simple structure and simple manufacturing process, and can reduce the cost of the top cover and further reduce the cost of the battery.

The technical scheme adopted by the utility model is as follows:

a pole connection structure for a lithium battery cover plate comprises a top cover plate, a positive pole and a negative pole, wherein the top cover plate is provided with a positive pole through hole and a negative pole through hole; the metal ceramic composite ring comprises a ceramic ring, a copper composite ring is arranged on the inner periphery of the ceramic ring, and an aluminum composite ring is arranged on the outer periphery of the ceramic ring; the inner periphery of the copper composite ring is welded with the negative pole column, and the outer periphery of the aluminum composite ring is welded with the through hole of the negative pole column.

Furthermore, the surface of the ceramic ring is provided with anti-rotation embossing textures. Therefore, the connection strength among the ceramic ring, the copper composite ring and the aluminum composite ring can be effectively improved through the anti-rotation embossing textures, and the relative movement and the relative rotation are prevented.

Further, the surface of the ceramic ring is provided with protrusions and depressions.

Furthermore, a bulge is arranged between the ceramic ring and the copper composite ring.

Furthermore, a recess is arranged between the ceramic ring and the aluminum composite ring.

Further, the width of the copper material of the copper composite ring is not less than 0.5 mm.

Furthermore, the width of the aluminum material of the aluminum composite ring is not less than 0.6 mm.

Preferably, the aluminum composite ring is provided with a boss at the periphery, the negative electrode through hole of the top cover plate is correspondingly provided with a step, and the boss can be placed on the step of the negative electrode through hole. Therefore, the welding of the metal ceramic composite ring, the top cover plate and the cathode column can be facilitated by placing the lug boss on the step of the cathode through hole.

Preferably, the negative pole column is a copper-aluminum composite plate.

As the preferred option, the positive post adopts aluminum plate, and positive post periphery and the anodal through-hole inner periphery of top cap piece contact and welding. Like this, can effectively reduce top cap cost through anodal post periphery and the anodal through-hole inner peripheral contact of top cap piece and welding.

The utility model has the beneficial effects that:

firstly, a negative pole post is welded with a through hole of the negative pole post through a metal ceramic composite ring, and a ceramic ring in the metal ceramic composite ring ensures the insulation between the negative pole post and a top cover plate; the copper composite ring and the aluminum composite ring are electroplated or poured on the ceramic ring, the inner periphery of the copper composite ring is welded with the negative pole column, and the outer periphery of the aluminum composite ring is welded with the through hole of the negative pole column, so that the sealing between the negative pole column and the top cover plate is ensured.

And secondly, anti-rotation embossing textures are arranged on the surface of the ceramic ring, and protrusions and depressions are arranged on the outer periphery surface and the inner periphery surface of the ceramic ring, so that the anti-rotation embossing textures, the protrusions and the depressions can increase the connection strength between the ceramic ring and the copper composite ring and between the ceramic ring and the aluminum composite ring, prevent relative movement and relative rotation, and enable the metal ceramic composite ring to bear certain torsional force.

And thirdly, the periphery of the aluminum composite ring is provided with a boss, the negative electrode through hole of the top cover plate is correspondingly provided with a step, and the boss can be placed on the step of the negative electrode through hole, so that the metal ceramic composite ring can be placed on the top cover plate, and the metal ceramic composite ring, the top cover plate and the negative electrode column can be conveniently welded.

Fourthly, the negative pole post uses a copper-aluminum composite plate to reduce the cost of the pole post; the positive post is directly manufactured and molded in a stamping mode, secondary machining is not needed, and the cost of the positive post can be reduced; the positive pole is directly welded on the top cover plate in a laser welding mode, and the structure is simple and the cost is low.

Fifthly, the utility model has simple structure and simple manufacturing process, and can reduce the cost of the top cover and further reduce the cost of the battery.

Drawings

Fig. 1 is a schematic diagram of a cover plate structure of a lithium battery in an embodiment of the utility model.

FIG. 2a is a schematic plane structure diagram of a cermet composite ring according to an embodiment of the present invention.

Fig. 2b is a schematic perspective view of a cermet composite ring according to an embodiment of the present invention.

Fig. 3 is a schematic view of the cross-sectional structure a-a in fig. 1.

Wherein: 1-top cover plate, 2-positive pole column, 3-liquid injection hole, 4-explosion-proof hole and explosion-proof sheet, 5-metal ceramic composite ring, 51-ceramic ring, 52-copper composite ring, 53-aluminum composite ring, 501-bulge, 502-recess, 503-boss and 6-negative pole column.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 1 to 3, a lithium battery cover plate terminal post connection structure comprises a top cover plate 1, a positive electrode post 2 and a negative electrode post 6, wherein the top cover plate 1 is provided with a positive electrode post through hole and a negative electrode post through hole, and the negative electrode post 6 is welded with the negative electrode post through hole through a metal ceramic composite ring 5. The metal ceramic composite ring 5 comprises a ceramic ring 51, a copper composite ring 52 is arranged on the inner periphery of the ceramic ring 51, and an aluminum composite ring 53 is arranged on the outer periphery of the ceramic ring 51.

The negative pole 6 is welded with the through hole of the negative pole through the metal ceramic composite ring 5, and the ceramic ring 51 in the metal ceramic composite ring 5 ensures the insulation between the negative pole 6 and the top cover plate. The copper composite ring 52 and the aluminum composite ring 53 are electroplated or cast on the ceramic ring 51, the inner periphery of the copper composite ring 52 is welded with the negative pole column 6, and the outer periphery of the aluminum composite ring 53 is welded with the through hole of the negative pole column, so that the sealing between the negative pole column 6 and the top cover plate is ensured.

Preferably, the surface of the ceramic ring 51 is roughened, and anti-rotation embossing textures are arranged, so that the contact area between the copper composite ring 52 and the surface of the ceramic ring 51 and the contact area between the aluminum composite ring 53 and the surface of the copper composite ring 52 are increased, and the anti-torsion capability of the pole is increased by increasing the connection strength between the copper composite ring 52 and the ceramic ring 51 and the connection strength between the aluminum composite ring 53 and the ceramic ring 51.

Preferably, the surface of the ceramic ring 51 is further provided with a protrusion 501 and a recess 502, when the copper composite ring 52 and the aluminum composite ring 53 are electroplated or cast on the ceramic ring 51, the contact area between the copper composite ring 52 and the ceramic ring 51 and the contact area between the aluminum composite ring 53 and the ceramic ring 51 can be increased by the protrusion 501 and the recess 502, and then the connection strength between the copper composite ring 52 and the ceramic ring 51 and the connection strength between the aluminum composite ring 53 and the ceramic ring 51 are increased to prevent relative movement and relative rotation. The ceramic ring 51 is provided with a protrusion 501 and a recess 502 on the surface, and the protrusion 501 is arranged between the ceramic ring 51 and the copper composite ring 52.

Preferably, as shown in fig. 3, a boss 503 is disposed on the periphery of the aluminum composite ring, a step is correspondingly disposed on the negative through hole of the top cover plate 1, and the boss 503 can be placed on the step of the negative through hole, so that the metal ceramic composite ring 5 can be placed on the top cover plate 1, and the metal ceramic composite ring 5 can be conveniently welded with the top cover plate 1 and the negative pole post 6.

The ceramic ring 51 has a ring structure, and the ceramic material is a high pressure resistant component, such as alumina ceramic. The width of the copper material of the copper composite ring 52 is not less than 0.5mm, so that the available size of a welding position is ensured, the thickness of the copper material is not less than 0.5mm, and the connection strength after welding is ensured. The aluminum material width of the aluminum composite ring 53 is not less than 0.6mm, the available size of the welding position is guaranteed, the aluminum material thickness is not less than 0.6mm, and the connection strength after welding is guaranteed.

The aluminum composite ring 53 on the outer side of the metal ceramic composite ring 5 is in contact with and connected with the inner periphery of the negative electrode through hole of the top cover plate 1 in a laser welding mode; the negative pole post 6 uses copper aluminium composite board stamping forming, and the copper material periphery of negative pole post 6 contacts and is connected with the inboard copper complex ring 52 of 5 compound rings of cermet, and the mode that the laser welding copper material position was used to the connected mode. Anodal post 2 uses aluminum plate stamping forming, with 2 periphery of anodal post and the anodal through-hole internal peripheral contacts of top cap piece and be connected, the connected mode can use laser welding.

The use of the copper-aluminum composite plate for the cathode post 6 can reduce the post cost; the negative pole post 6 is connected with the top cover plate 1 through the metal ceramic composite ring 5, so that the top cover has a simple structure and few manufacturing procedures, and the cost is further reduced; the appearance size of the positive pole 2 is the same as that of the negative pole 6, the positive pole is directly welded on the top cover plate in a laser welding mode, the positive pole is directly manufactured and molded in a stamping mode, secondary machining is not needed, and the cost of the positive pole can be reduced.

Compared with the prior art, the utility model cancels the sealing ring, has only a pole column on the positive pole column, has no other structures such as an aluminum-plastic composite pressing block and the like, and has low cost of the top cover.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention without departing from the technical solution of the present invention.

Details not described in this specification are within the skill of the art that are well known to those skilled in the art.

Claims

1. A pole connection structure for a lithium battery cover plate comprises a top cover plate (1), a positive pole (2) and a negative pole (6), wherein the top cover plate (1) is provided with a positive pole through hole and a negative pole through hole, and the pole connection structure is characterized in that the negative pole (6) is welded with the negative pole through hole through a metal ceramic composite ring (5); the metal ceramic composite ring (5) comprises a ceramic ring (51), a copper composite ring (52) is arranged on the inner periphery of the ceramic ring (51), and an aluminum composite ring (53) is arranged on the outer periphery of the ceramic ring (51); the inner periphery of the copper composite ring (52) is welded with the negative pole post (6), and the outer periphery of the aluminum composite ring (53) is welded with the through hole of the negative pole post.

2. The pole connecting structure for the lithium battery cover plate according to claim 1, wherein the ceramic ring (51) has an anti-rotation embossed texture on the surface.

3. The pole connecting structure for a lithium battery cover plate according to claim 2, wherein the ceramic ring (51) is provided with protrusions (501) and depressions (502) on the surface.

4. The pole connecting structure for a lithium battery cover plate according to claim 3, wherein a protrusion (501) is provided between the ceramic ring (51) and the copper composite ring (52).

5. The pole connecting structure for a lithium battery cover plate according to claim 3, wherein a recess (502) is provided between the ceramic ring (51) and the aluminum composite ring (53).

6. The pole connecting structure for a lithium battery cover plate according to claim 1, wherein the copper material width of the copper composite ring (52) is not less than 0.5 mm.

7. The pole connecting structure for a lithium battery cover plate according to claim 1, wherein the aluminum composite ring (53) has an aluminum width of not less than 0.6 mm.

8. The pole connecting structure for the lithium battery cover plate according to claim 3, wherein a boss (503) is arranged on the periphery of the aluminum composite ring (53), a step is correspondingly arranged on the negative electrode through hole of the top cover plate (1), and the boss (503) can be placed on the step of the negative electrode through hole.

9. The pole connecting structure for the lithium battery cover plate according to claim 1, wherein the negative pole (6) is a copper-aluminum composite plate.

10. The pole connecting structure for the lithium battery cover plate according to claim 1, wherein the positive pole (2) is made of an aluminum plate, and the outer periphery of the positive pole (2) is in contact with and welded to the inner periphery of the positive through hole of the top cover plate.