A top cover structure and lithium battery with a terminal ear and a terminal column pressed together

Abstract

The utility model relates to a top cover structure in which a pole ear and a pole are pressed together, comprising positive and negative poles, positive and negative pole ears and a top cover, wherein the top cover has through holes corresponding to the positions of the positive and negative poles, and a U-shaped pressing block is arranged between the positive and negative poles and the positive and negative pole ears, wherein the U-shaped pressing block comprises a bottom plate and a round pin, and the positive and negative poles are provided with round pin holes, and the round pins of the U-shaped pressing block are interference fit with the round pin holes of the positive and negative poles, and the positive and negative pole ears overlap with the bottom plate of the U-shaped pressing block, and the positive and negative poles form a top cover structure in which the pole ear and the pole are pressed together through the U-shaped pressing block and the positive and negative pole ears. A lithium battery adopting a top cover structure in which the pole ear and the pole are pressed together. The utility model optimizes and upgrades the pole ear welding connection method of the square-shaped battery cell, cancels the ultrasonic welding + laser welding operation of the battery cell, and adopts the pole ear and the pole column to be pressed together, which can solve the problem of excessive folding and easy damage of the pole ear of the battery cell, reduce welding dust and foreign matter, and improve the safety of the battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and particularly to a top cover structure and a lithium battery in which a pole ear and a pole are press-fitted together. Background Art

[0002] Aluminum shell batteries refer to batteries with aluminum alloy battery shells, mainly square batteries. Square batteries are generally made of two bare cells rolled together, and then a top cover is fixed on the top of the bare cells. The current mainstream top cover structure solutions are as follows:

[0003] Solution 1: The top cover structure consists of a positive pole, a negative pole, a sealing ring, a top cover sheet, a stainless steel retaining ring, a ceramic ring, and anti-rotation ceramics. Grooves are machined on the upper part of the positive and negative poles, and grooves are machined on the lower part of the positive and negative poles. Through holes are opened on the top cover sheet at positions corresponding to the positive and negative poles, and grooves are machined at positions corresponding to the ceramics on the top cover sheet. The top cover assembly method is: insert the sealing ring into the pole, put the anti-rotation ceramics into the grooves at the lower part of the positive and negative poles, pass this assembly from the bottom of the top cover sheet through the through holes at the positions of the positive and negative poles on the top cover sheet, insert the ceramic rings into the upper part of the positive and negative poles above the top cover sheet, insert the stainless steel retaining rings into the grooves at the upper part of the positive and negative poles and press the ceramic rings tightly;

[0004] Solution 2: The top cover structure consists of a positive pole, a negative pole, a sealing ring, a top cover sheet, and a PPS casting. Grooves and anti-rotation embossed textures are processed on the upper part of the positive and negative poles, and through holes are opened on the top cover sheet at the positions corresponding to the positive and negative poles. The assembly method is to insert the sealing ring into the pole, insert the assembly from the bottom of the top cover sheet into the through holes corresponding to the positive and negative poles, use a mold to fix the position of the assembly, and pour PPS around the pole column surface and between it and the through hole of the top cover sheet.

[0005] In the existing battery cell manufacturing top cover structure, the way to connect the tabs to the poles is: ultrasonic welding + laser welding. This process requires repeated folding of the tabs; and the vibration of the tabs by ultrasonic waves has the risk of damaging the tabs; laser welding of the tab connection sheet has the risk of welding slag and other metal foreign matter. In particular, for the pole group where the tabs have been folded, there is a risk of ineffective identification. Utility Model Content

[0006] The utility model aims to overcome the deficiencies in the prior art and provides a top cover structure and a lithium battery in which a pole ear and a pole are press-fitted together, which can replace ultrasonic welding + laser welding operations, avoid excessive folding of the pole ear, and improve the safety of the battery cell.

[0007] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical scheme: a top cover structure in which a pole ear and a pole are pressed together, comprising a positive pole, a negative pole, a positive pole ear and a top cover, wherein holes are opened in the top cover corresponding to the positions of the positive pole and the negative pole, a U-shaped pressing block is arranged between the positive pole and the negative pole and the positive pole ear, the U-shaped pressing block comprises a bottom plate and a round pin, and round pin holes are arranged on the positive pole and the negative pole, the round pin of the U-shaped pressing block is interference fit with the round pin hole of the positive pole and the negative pole, the positive pole ear and the bottom plate of the U-shaped pressing block are overlapped, and the positive pole and the negative pole are connected to the pole ear and the pole through the U-shaped pressing block and the positive pole ear to form a top cover structure in which the pole ear and the pole are pressed together.

[0008] Furthermore, the round pins of the U-shaped pressing block are vertically fixed to the two sides of the bottom plate, and the round pins on both sides are inserted into the round pin holes of the positive and negative poles.

[0009] Furthermore, the top of the round pin of the U-shaped pressing block is provided with an insertion chamfer.

[0010] Furthermore, a long exhaust groove is provided on the round pin of the U-shaped pressing block along its axial direction.

[0011] Furthermore, the positive and negative electrode ears are symmetrically placed at the center of the bottom plate of the U-shaped pressing block after being bent.

[0012] A lithium battery with a top cover structure in which a pole ear and a pole are press-fitted and connected, the lithium battery also includes a battery shell and a battery cell arranged in the battery shell, the outer side of the battery cell is wrapped with a first insulating film, and the outer side of the battery shell is wrapped with a second insulating film.

[0013] Beneficial effects: Compared with the prior art, the structure of the tab pressing connection of the utility model optimizes and upgrades the tab welding connection method of the square-type battery cell, cancels the ultrasonic welding + laser welding operation of the battery cell, can solve the problem of excessive folding and easy damage of the tab of the battery cell, reduce welding dust and foreign matter, improve the safety of the battery cell, and reduce the manufacturing cost of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the U-shaped pressing block;

[0015] Figure 2 It is the front view of the top cover structure;

[0016] Figure 3 yes Figure 2 Left view of

[0017] Figure 4 It is a top view of the positive and negative electrode ears after being bent and symmetrically placed on the bottom plate of the U-shaped pressing block.

[0018] In the figure: 1. positive and negative poles, 1-1. round pin holes, 2. positive and negative ears, 3. top cover, 4. U-shaped pressure block, 4-1. bottom plate, 4-2. round pins, 4-2-1. insert chamfers, 4-2-2. exhaust slots, 5. battery cells. DETAILED DESCRIPTION

[0019] The following is a detailed description of the specific implementation method provided according to the utility model in combination with the preferred embodiment: See the accompanying drawings for details. The present embodiment provides a top cover structure in which the pole ear and the pole are pressed together, including positive and negative poles 1, positive and negative pole ears 2 and a top cover 3. The top cover has through holes corresponding to the positions of the positive and negative poles. A U-shaped pressing block 4 is placed between the positive and negative poles and the positive and negative pole ears. The U-shaped pressing block includes a bottom plate 4-1 and a round pin 4-2. A round pin hole 1-1 is provided on the positive and negative poles. The round pin of the U-shaped pressing block is interference fit with the round pin hole of the positive and negative poles. The positive and negative pole ears overlap the bottom plate of the U-shaped pressing block. The positive and negative poles are connected to the pole ears and the poles through the U-shaped pressing block and the positive and negative pole ears to form a top cover structure in which the pole ears and the poles are pressed together.

[0020] The preferred solution of this embodiment is that the round pins of the U-shaped pressing block are vertically fixed to the two sides of the bottom plate, and the round pins on both sides are inserted into the round pin holes of the positive and negative poles.

[0021] The preferred solution of this embodiment is that the top of the round pin of the U-shaped pressing block is provided with an insertion chamfer 4-2-1 to facilitate the smooth insertion of the round pin into the round pin holes of the positive and negative poles.

[0022] The preferred solution of this embodiment is that a long exhaust groove 4-2-2 is provided on the round pin of the U-shaped pressing block along its axial direction, and the gas in the round hole is discharged after the round pin is successfully inserted into the round pin hole of the positive and negative poles.

[0023] A preferred solution of this embodiment is that the positive and negative electrode ears are symmetrically placed at the center of the bottom plate of the U-shaped pressing block after being bent.

[0024] The lithium battery of this embodiment is manufactured using a top cover structure in which the pole ear and the pole are press-fitted together. The lithium battery also includes a battery shell and a battery cell arranged in the battery shell. The outer side of the battery cell is wrapped with a first insulating film, and the outer side of the battery shell is wrapped with a second insulating film.

[0025] The dimensions of the U-shaped pressing block of this embodiment are: length 30-35 mm, width 20-25 mm, thickness 1-3 mm, round pin height 7-10 mm, and round pin diameter 3-6 mm.

[0026] Working process

[0027] 1. Set a U-shaped pressing block on the pole surface under the top cover;

[0028] 2. An interference fit relationship is established between the U-shaped pressing block and the pole body, so that it can be fastened and riveted;

[0029] 3. Pre-knead the pole ear of the battery cell pole group (hot pressing or cold pressing is possible), then insert it into the groove of the U-shaped pressing block, and then press and connect the U-shaped pressing block with the pole body by cold pressing to complete the connection between the pole ear and the top cover pole;

[0030] 4. The stability of the U-shaped pressing block after pressing needs to meet the pull-out force requirements such as vibration testing.

[0031] The above-mentioned reference embodiments describe in detail a top cover structure and a lithium battery in which a pole ear and a pole are pressed together, which are illustrative rather than restrictive. Several embodiments can be listed according to the limited scope. Therefore, changes and modifications without departing from the overall concept of the utility model should fall within the scope of protection of the utility model.

Claims

1. A top cover structure for connecting a pole ear to a pole column by press-fitting, comprising a positive pole column, a negative pole column, a positive pole ear and a negative pole ear, and a top cover, wherein holes are opened in the top cover corresponding to the positions of the positive pole column, and the characteristics are: A U-shaped pressing block is placed between the positive and negative electrode columns and the positive and negative electrode ears. The U-shaped pressing block includes a bottom plate and a round pin. The positive and negative electrode columns are provided with round pin holes. The round pins of the U-shaped pressing block are interference fit with the round pin holes of the positive and negative electrode columns. The positive and negative electrode ears overlap with the bottom plate of the U-shaped pressing block. The positive and negative electrode columns are connected to the positive and negative electrode ears through the U-shaped pressing block to form a top cover structure in which the pole ears and the electrode columns are pressed together.

2. The top cover structure for connecting the pole lug and the pole by press-fitting according to claim 1 is characterized in that: The round pins of the U-shaped pressing block are vertically fixed to the two sides of the bottom plate, and the round pins on the two sides are inserted into the round pin holes of the positive and negative poles.

3. The top cover structure for pressing and connecting the pole lug and the pole according to claim 1 or 2, characterized in that: The top of the round pin of the U-shaped pressing block is provided with an insertion chamfer.

4. The top cover structure for connecting the pole lug and the pole by press-fitting according to claim 3 is characterized in that: The round pin of the U-shaped pressing block is provided with a long exhaust groove along its axial direction.

5. The top cover structure for connecting the pole lug and the pole by press-fitting according to claim 1 is characterized in that: The positive and negative electrode ears are symmetrically placed at the center of the bottom plate of the U-shaped pressing block after being bent.

6. A lithium battery, characterized in that: It comprises a top cover structure in which the pole ear and the pole are press-fitted and connected as described in any one of claims 1 to 5; it also comprises a battery shell, and a battery cell arranged in the battery shell, the outer side of the battery cell is wrapped with a first insulating film, and the outer side of the battery shell is wrapped with a second insulating film.

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