CN-122025985-A - Battery shell assembly, welding fixture and welding method

CN122025985ACN 122025985 ACN122025985 ACN 122025985ACN-122025985-A

Abstract

The invention relates to a battery shell assembly, a welding fixture and a welding method, wherein the welding method comprises the steps of providing an electrode assembly and a shell, wherein the electrode assembly comprises a sleeve and a pole column positioned in the sleeve, the sleeve and the pole column are sealed through a glass ring, the sleeve comprises a cylinder body, one end of the cylinder body is provided with a flanging flange, the shell comprises a first side plate, and a mounting hole is formed in the first side plate; clamping and positioning the electrode assembly and the first side plate by using a welding tool, so that the cylinder body is inserted into the mounting hole, and the flanging flange is attached to the first side plate; and welding the flanging flange on the first side plate to form annular welding marks at the joint of the flanging flange and the first side plate. The invention also discloses a battery shell assembly and a welding fixture. The invention can improve the reliability and safety of the battery shell assembly.

Inventors

ZHONG DINGHUA
CHEN JINPENG
WANG TIANMIN
FU JINGQIN
CHEN HAIFENG

Assignees

苏州中科瑞龙科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (14)

1. A welding method of a battery case assembly is characterized by comprising the steps of, The electrode assembly comprises a sleeve and a pole column positioned in the sleeve, wherein the outer diameters of the top surface and the bottom surface of the pole column are larger than the outer diameter of the middle part, the outer diameters of the pole column gradually and continuously increase from the middle part to the top surface and the bottom surface respectively, and the inner wall of the sleeve and the outer wall of the pole column are in fusion sealing connection through a glass ring; Clamping and positioning the electrode assembly and the first side plate by using a welding tool, so that the cylinder body is inserted into the mounting hole, and the flanging flange is attached to the first side plate; And welding the flanging flange on the first side plate to form an annular weld mark at the joint of the flanging flange and the first side plate.
2. The method of welding a battery case assembly according to claim 1, wherein the flange is welded to the first side plate by a segment welding method comprising, The flange with the junction of first curb plate is preset multistage welding position, all the welding position encloses and closes and be cyclic annular, and is right during the welding every section the welding position welds in proper order, has the time interval of predetermineeing between the welding time of two adjacent welding positions.
3. The method for welding a battery case assembly according to claim 2, wherein the total number of welding positions is 4 to 16, and the step of welding includes sequentially numbering all the welding positions with numbers 1 to N, wherein N is a natural number greater than 1, welding is performed at the welding positions with an odd number first and then at the welding positions with an even number first, or welding is performed at the welding positions with an even number first and then at the welding positions with an odd number first.
4. The method of welding a battery case assembly according to claim 1, wherein the region of the first side plate located at the periphery of the annular weld mark constitutes a non-welded region, and the non-welded region is connected to a welding tool through a heat insulating member.
5. The welding method of the battery case assembly according to claim 1, wherein a cooling channel is formed in the welding tool, cooling liquid is introduced into the cooling channel for circulating flow in the process of welding the flanging flange on the first side plate, the flow rate of the cooling liquid is 0.2-5L/min, and the temperature of the cooling liquid when entering the cooling channel is 5-40 ℃.
6. The method for welding a battery case assembly according to claim 1, wherein a pulse laser welding mode is adopted when the flange is welded on the first side plate, a laser wavelength adopted when the pulse laser welding mode is implemented is 1000-1100 nm, a pulse width is 0.5-10 ms, single pulse energy is 0.05-2.0J, and a light spot diameter is 0.1-0.6 mm.
7. The method for welding a battery case assembly according to claim 1, wherein the flange is welded to the first side plate by pulse heat and pressure welding, the welding pressure of the pulse heat and pressure welding is 5-50N, the heating temperature peak value is 200-450 ℃, and the heating time is 0.1-2 s.
8. A welding fixture is characterized by comprising a first clamping piece and a second clamping piece, wherein the flanging flange is jointed with the first side plate and clamped between the first clamping piece and the second clamping piece, a first through hole is formed in the middle of the first clamping piece, and an area, welded with the flanging flange, of the first side plate is exposed in the first through hole.
9. The welding fixture of claim 8, wherein the first clamping member is provided with a clamping groove, a heat insulating member is arranged in the clamping groove, a non-welding area is formed by the area, located at the periphery of the annular welding mark, of the first side plate, and the heat insulating member is in contact with the non-welding area.
10. The welding fixture of claim 9, wherein the thermal conductivity of the thermal shield is less than 10W/(m.K).
11. The welding fixture of claim 8, wherein the second clamping member is internally provided with a cooling channel for cooling liquid to flow.
12. The welding fixture of claim 8, wherein the first clamping piece and the second clamping piece are connected through a guide post, a first positioning hole is formed in the first clamping piece, a second positioning hole is formed in the second clamping piece, and the guide post sequentially penetrates through the first positioning hole and the second positioning hole.
13. A battery case assembly is characterized by being prepared by adopting the welding method according to any one of claims 1-7, the battery case assembly comprises a shell and an electrode assembly, the electrode assembly comprises a sleeve and a pole column positioned in the sleeve, the sleeve and the pole column are sealed through a glass ring, the sleeve comprises a cylinder body, one end of the cylinder body is provided with a flanging flange, the shell comprises a first side plate, a mounting hole is formed in the first side plate, the cylinder body is inserted into the mounting hole, the flanging flange is welded with the first side plate, and an annular weld mark is formed at the joint of the flanging flange and the first side plate.
14. The battery case assembly of claim 13, wherein the flange has a width of 0.2-0.5 mm.

Description

Battery shell assembly, welding fixture and welding method Technical Field The invention relates to the technical field of batteries, in particular to a battery shell assembly and a welding method. Background The battery shell assembly is generally composed of a shell and an electrode assembly, wherein an internal battery core and an external electric element of the shell are electrically connected through the electrode assembly, the electrode assembly is generally fixed on the shell through a riveting process, the electrode assembly comprises a pole column, an insulating piece is required to be arranged between the pole column and the shell to ensure insulating sealing, a plastic piece is generally adopted as the insulating piece, but the plastic piece is low in temperature resistance and poor in corrosion resistance, the sealing insulating performance of the shell is influenced by failure easily caused by thermal disturbance, humidity or long-term mechanical stress, the safety requirement of the battery under high-power charging and discharging conditions and the requirement of long-term use safety are difficultly met, in addition, the riveting process has high dependence on equipment precision and material performance, the yield and production efficiency are difficultly ensured, microcracks are difficultly generated in the riveting process, the insulating performance between the pole column and the shell is reduced, the riveting structure is difficultly ensured to ensure long-term stable mechanical strength, and the failure easily occurs in a falling or thermal cycling environment. Therefore, the shell assembly assembled by adopting the existing plastic riveting packaging mode cannot guarantee the reliability and the safety of the product. Disclosure of Invention Therefore, the technical problem to be solved by the invention is to improve the reliability and safety of the battery shell assembly in the prior art. In order to solve the technical problems, the invention provides a welding method of a battery shell component, which comprises the following steps of, The method comprises the steps of providing an electrode assembly and a shell, wherein the electrode assembly comprises a sleeve and a pole column positioned in the sleeve, the sleeve and the pole column are sealed through a glass ring, the sleeve comprises a barrel, a flanging flange is formed at one end of the barrel, the shell comprises a first side plate, and a mounting hole is formed in the first side plate; Clamping and positioning the electrode assembly and the first side plate by using a welding tool, so that the cylinder body is inserted into the mounting hole, and the flanging flange is attached to the first side plate; And welding the flanging flange on the first side plate to form an annular weld mark at the joint of the flanging flange and the first side plate. In one embodiment of the invention, the flange is welded to the first side plate by a segment welding method, wherein the segment welding method comprises, The flange with the junction of first curb plate is preset multistage welding position, all the welding position encloses and closes and be cyclic annular, and is right during the welding every section the welding position welds in proper order, has the time interval of predetermineeing between the welding time of two adjacent welding positions. In one embodiment of the present invention, the total number of the welding positions is 4 to 16, and the segment welding method includes sequentially numbering all the welding positions with 1 to N numbers, where N is a natural number greater than 1, welding at the welding positions with an odd number first and then welding at the welding positions with an even number first, or welding at the welding positions with an even number first and then welding at the welding positions with an odd number first. In one embodiment of the invention, the area of the first side panel that is located at the periphery of the annular weld mark forms a non-weld zone, which is connected to the welding tool by a heat shield. In one embodiment of the invention, a cooling channel is arranged in the welding tool, and cooling liquid is introduced into the cooling channel for circulating flow in the process of welding the flanging flange on the first side plate, wherein the flow rate of the cooling liquid is 0.2-5L/min, and the temperature of the cooling liquid when entering the cooling channel is 5-40 ℃. In one embodiment of the invention, a pulse laser welding mode is adopted when the flanging flange is welded on the first side plate, the laser wavelength adopted when the pulse laser welding mode is implemented is 1000-1100 nm, the pulse width is 0.5-10 ms, the single pulse energy is 0.05-2.0J, and the light spot diameter is 0.1-0.6 mm. In one embodiment of the invention, a pulse hot-press welding mode is adopted when the flanging flange is welded on the first side plate, and the welding pressure of the p