WO2022247251A1

WO2022247251A1 - Busbar repairing method for storage battery having direct connection structure

Info

Publication number: WO2022247251A1
Application number: PCT/CN2021/139684
Authority: WO
Inventors: 李明钧; 李军; 魏妮妮; 胡国柱
Original assignee: 浙江天能电池(江苏)有限公司; 浙江天能电池江苏新能源有限公司; 天能集团江苏特种电源有限公司; 天能集团江苏科技有限公司
Priority date: 2021-05-28
Filing date: 2021-12-20
Publication date: 2022-12-01
Also published as: CN113385884B; CN113385884A

Abstract

The present invention relates to the field of storage batteries, and disclosed is a busbar repairing method for a storage battery having a direct connection structure. The busbar repairing method comprises: identifying and picking out poor pseudo soldering caused by slag inclusion of a tab, and cutting a slope notch at the slag inclusion; identifying and picking out poor glue adsorption of an electrode plate caused by capillarity due to the fact that a side negative tab is not bent towards an inner side, cutting a section on each of two sides of the side negative tab, then bending the side negative tab towards the inner side, and cutting a slope notch on each of the sections on the two sides; identifying and picking out poor deviation pseudo soldering of the side negative tab, and cutting a slope notch at the virtual connection of the side negative tab and a busbar; identifying and picking out poor fusing of the tab, and cutting a trumpet-shaped notch on the busbar right above the fusing position of the tab; and respectively soldering solder wires into the slope notches and the trumpet-shaped notch by using an electric soldering iron. According to the present invention, under the condition that the busbar is not lifted and the tab is pulled out, said defects of the busbar can be directly repaired and soldered, so that the tab having relatively thin thickness can be prevented from secondary damage caused by repairing.

Description

Repair method of battery bus bar with direct connection structure

technical field

The invention relates to the field of storage batteries, in particular to a method for repairing busbars of storage batteries with a direct connection structure.

Background technique

The cast-welded structure of the electric vehicle battery basically adopts the busbar bridge-free connection structure, which has the problem of bridge breakage, and the bridge connection needs to consume more lead. At present, the improved design of the bridge-free structure of the battery into a bus-bar direct connection structure can greatly reduce the lead consumption of casting and welding, and the battery basically does not have the problem of broken cells, which improves the quality of the product. The direct connection of the busbar adopts the dipping structure, and the plate is continuously cast, and the lug is thin, and the quality problems that often occur are: code A-the slag inclusion of the pole lug causes false welding; code B-the side of the negative plate lug must be folded inward Bend, otherwise capillary phenomenon will occur, and the plate will absorb glue to cause defects; code name C side negative ear is offset and false welding; code name D - ear ear is blown.

The original method of repairing the quality problems of the above-mentioned busbars is to raise the busbars to pull out the tabs for direct welding, melt the tab material and then weld and repair, but now because the direct connection of the busbars adopts a dipped structure, At the same time, the plate adopts continuous casting, and the tab is relatively thin. If the above method is still used, it will easily cause secondary damage to the tab during the process of raising the busbar and leaking the tab. In order to solve this problem, it is necessary to find a more An optimal method overcomes the above-mentioned problems.

Contents of the invention

Purpose of the invention: Aiming at the problems existing in the prior art, the present invention provides a method for repairing battery busbars with a direct-connection structure. The defective batteries are picked out by the inspectors for repair, which prevents defective products from entering the market.

Technical solution: The present invention provides a method for repairing busbars of batteries with a direct connection structure, which includes the following steps: Step 1: identify the defect and make a cut; identify and pick out the poor welding defect A caused by the slag inclusion in the tab, and place it at the slag inclusion Cut the slope cut a, and use a scraper to scrape off the slag inclusions and oxides on the side of the tab; identify and pick out the capillary phenomenon caused by the capillary phenomenon caused by the side negative tab not bending inward, which causes the plate to absorb glue B badly. Cut a cross-section on each side, then bend the side negative ear to the inside by 10°-20°, and cut a slope incision b at the cross-section on both sides; identify and pick out the bad welding of the side negative ear deviation C , cut a slope incision c at the virtual junction between the negative tab and the bus bar; identify and pick out the bad fuse of the tab D, and cut a trumpet-shaped incision d on the bus bar directly above the fuse of the tab; the second step: repair Incisions: Use a 50-200w electric soldering iron to weld solder wires into each of the sloped incisions and the trumpet-shaped incision c.

Preferably, each of the slope cuts is 20-45°.

Preferably, the trumpet-shaped cut c is 40-90°.

Preferably, the electric soldering iron stays for 0.1-5 seconds at each of the sloping cuts or trumpet-shaped cuts c. In practical application, the soldering iron should stay at each slope incision or trumpet-shaped incision for 0.1-5s to melt the solder wire with the busbar or tab. Be careful not to stay at the slope incision for too long. , usually controlled within 0.1 to 5 seconds, poor control may easily cause solder wire leakage, affecting the repair quality.

Preferably, when soldering, the tin content in the solder wire 31 is 10%-30%.

Preferably, the direct-connected storage battery includes a pole group and a battery tank, the pole group is formed by a number of positive bus bars and negative bus bars connected in series, and the pole group is provided with a positive plate, a negative plate and a side negative plate, The positive tab is provided on the positive plate, the negative tab is provided on the negative plate, and the side negative tab is provided on the side negative plate; the positive tab, the negative tab and the side negative tab are respectively welded to the The positive bus bar and the negative bus bar; the battery slot is provided with a plurality of single cell slots, and a spacer plate is provided between two adjacent single cell slots, and each of the single cell slots is provided with a There is a matching pole group, and the side negative plate of the pole group is attached to the side wall of the partition plate.

Beneficial effects: the present invention can improve the quality of the busbar caused by bad soldering caused by slag inclusion in the tabs, poor glue absorption on the polar plates caused by the non-inward bending of the negative tabs, poor welding of the side negative tabs, and poor fusing of the tabs. The problem is that the above-mentioned defects of the bus bar can be directly reworked and welded without raising the bus bar to pull out the tabs, so that the thinner tabs can be protected from secondary damage caused by rework.

The slope incision and the trumpet-shaped incision in the present invention have a larger opening at the top of the incision and a smaller opening at the bottom, which facilitates the filling of solder wire and prevents leakage. In the process of repairing the incision, the tension of the solder wire in the molten state is used to adsorb on the slope gap or the trumpet-shaped incision to achieve successful repair.

Description of drawings

Figure 1 is a schematic cross-sectional schematic diagram of the front view of A and B defects;

Fig. 2 is a schematic cross-sectional schematic diagram of cut-off front view of A and B defects;

Figure 3 is a schematic cross-sectional schematic diagram of the front view of defects C and D;

Figure 4 is a schematic cross-sectional schematic diagram of the cut-off front view of C and D defects;

Fig. 5 is a schematic cross-sectional view of the front view when the incision is filled with solder wire;

Fig. 6 is a schematic cross-sectional view of the front view after the incision is filled with solder wire;

Fig. 7 is a front view sectional schematic diagram after bad repair of A and B;

Fig. 8 is a schematic cross-sectional view of C and D defective repairs.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

This embodiment provides a busbar repair method for a battery with a direct connection structure. As shown in FIG. 1, the battery with a direct connection structure includes an electrode group 1 and a battery tank 2. 15 connected in series, the pole group 1 is provided with a positive plate 11, a negative plate 12 and a side negative plate 13, the positive plate 11 is provided with a positive electrode ear 111, the negative plate 12 is provided with a negative electrode ear 121, and the side negative plate 13 Side negative pole ears 131 are provided on the top; positive pole ears 111, negative pole ears 121 and side negative pole ears 131 are welded to positive bus bar 14 and negative bus bar 15 respectively; Spacer plates 22 are provided between the grid slots 21 , and a matching pole group 1 is provided in each single grid slot 21 , and the side negative plates 13 of the pole group 1 are attached to the side walls of the spacer plates 22 .

1. The method of modifying the defective welding caused by the slag inclusion in the tabs of the above-mentioned direct-connected battery busbar is as follows:

Identify and pick out code A-tab slag inclusions resulting in poor welding (as shown in Figure 1), cut a 30° slope incision a at the slag inclusions, and scrape off the slag inclusions and oxides on the side of the tabs with a scraper (as shown in Figure 1) 2); Then use a 150w electric soldering iron 3 to weld a solder wire 31 with a tin content of 20% at the slope cut a (as shown in Figure 5), and keep the electric soldering iron 3 at the slope cut a for 2 seconds during welding (as shown in Figure 6 ). See Figure 7 after repairing.

2. In the bus bar of the battery with the above-mentioned direct connection structure, the capillary phenomenon caused by the capillary phenomenon caused by the side negative tab 131 not being bent inward is as follows:

Identify and pick out the code B-because the side negative electrode ear 131 is not bent inward, resulting in capillary phenomenon, which leads to poor adsorption of glue on the plate (as shown in Figure 1), cut a section on both sides of the side negative electrode ear 131, and then insert the side negative electrode ear 131 bend 10°-20° towards the inside, and cut 30° slope cuts b on both sides (as shown in Figure 2); 20% solder wire 31 (as shown in FIG. 5 ), and keep the electric soldering iron 3 at the slope notch b for 3 seconds during soldering (as shown in FIG. 6 ). See Figure 7 after repairing.

3. The method of modifying the bad welding of the side negative tab of the bus bar of the above-mentioned direct-connected battery is as follows:

Identify and pick out the code C-side negative electrode ear 131 deviation and poor welding (as shown in Figure 3), cut a 30° slope incision c at the virtual junction between the side negative electrode ear 131 and the bus bar (as shown in Figure 4); then use a 150w electric With the soldering iron 3, solder the solder wire 31 with a tin content of 20% at the slope cut c, and keep the electric soldering iron 3 at the slope cut c for 2 seconds during welding. See Figure 8 after repairing.

4. The method of modifying the bad fuse of the tabs in the bus bar of the above-mentioned direct-connected battery is as follows:

Identify and pick out the code D-bad lug fuse (as shown in Figure 3), cut an 80° horn-shaped cut d on the bus bar directly above the fuse of the tab (as shown in Figure 4); then use a 150w electric soldering iron 3, Solder wire 31 with a tin content of 20% into the trumpet-shaped cutout d (as shown in Figure 5), and keep the electric soldering iron at the trumpet-shaped cutout d for 4 seconds during welding (as shown in Figure 6). See Figure 8 after repairing.

In this embodiment, for the above defects, it is simple and quick to pick and repair, use the electric soldering iron 3 to melt the solder wire, and the tension of the solder wire 31 in the molten state is absorbed on the gap principle to repair the battery, and the tab can be pulled out without raising the bus bar Next, directly rework and weld the above-mentioned various defects of the busbar, so that the thinner tabs can be protected from secondary damage caused by rework, and the flow of defective products into the market can be reduced.

The above-mentioned embodiments are only to illustrate the technical conception and characteristics of the present invention, and its purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

A method for repairing a bus bar of a battery with a direct connection structure, characterized in that it comprises the following steps:

The first step: identify bad and incision;

Identify and pick out the poor soldering A caused by the slag inclusions in the tabs, cut a slope incision a at the slag inclusions, and scrape off the slag inclusions and oxides on the side of the tabs with a scraper;

Identify and pick out the capillary phenomenon caused by the capillary phenomenon caused by the side negative tab not bending inward, which leads to poor glue absorption on the plate B, cut a section on both sides of the side negative tab (131), and then turn the side negative tab (131) towards the inside Bending 10°-20°, cut the slope incision b at the sections on both sides respectively;

Identify and pick out the bad weld C in the offset position of the side negative pole ear, and cut a slope incision c at the virtual junction between the side negative pole ear (131) and the bus bar;

Identify and pick out the bad fuse D of the tab, and cut a trumpet-shaped cut d on the bus bar directly above the fuse of the tab;

Step Two: Patching the Cut:

Use a 50-200w electric soldering iron (3) to weld solder wires (31) into each of the sloping cuts and the horn-shaped cuts c.
The method for repairing the bus bar of a direct-connected storage battery according to claim 1, wherein each of the slope cuts is 20-45°.
The method for repairing the bus bar of a direct-connected storage battery according to claim 1, wherein the horn-shaped cut c is 40-90°.
The method for repairing the bus bar of a direct-connected storage battery according to claim 1, characterized in that, during welding, the electric soldering iron (3) stays for welding at each of the slope cuts or the horn-shaped cuts c for 0.1-5s .
The method for repairing the bus bar of a direct-connected storage battery according to claim 1, characterized in that, during welding, the tin content in the solder wire (31) is 10%-30%.
The method for repairing the bus bar of a battery with a direct connection structure according to any one of claims 1 to 4, characterized in that the battery with a direct connection structure includes an electrode group (1) and a battery tank (2), and the electrode group (1) It is composed of a number of positive busbars (14) and negative busbars (15) in series, and the positive plate (11), negative plate (12) and side negative plate (13) are arranged in the pole group (1) , the positive plate (11) is provided with positive tabs (111), the negative plate (12) is provided with negative tabs (121), and the side negative plate (13) is provided with side negative tabs (131) ; The positive tab (111), the negative tab (121) and the side negative tab (131) are respectively welded to the positive busbar (14) and the negative busbar (15); the battery tank (2), be provided with several single-cell grooves (21), be provided with spacer plate (22) between adjacent two described single-cell grooves (21), be provided with in each described single-cell groove (21) For the matched pole group (1), the side negative plate (13) of the pole group (1) is attached to the side wall of the partition plate (22).