CN110660954A - Welding method for conductive connecting sheet of power battery module - Google Patents
Welding method for conductive connecting sheet of power battery module Download PDFInfo
- Publication number
- CN110660954A CN110660954A CN201910891033.2A CN201910891033A CN110660954A CN 110660954 A CN110660954 A CN 110660954A CN 201910891033 A CN201910891033 A CN 201910891033A CN 110660954 A CN110660954 A CN 110660954A
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- China
- Prior art keywords
- connecting sheet
- conductive connecting
- welding
- pole
- battery module
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a welding method of a conductive connecting sheet of a power battery module, which comprises the following steps: arranging the battery cores according to a design; placing two end plates at two ends of the battery core arrangement; welding the side panel and the end plate of the module under a set pressure; placing a top plastic bracket at the top end of the battery module according to a designed position; placing the conductive connecting sheet according to a designed position; lightly hammering the conductive connecting sheet above each pole by using a tool to attach the conductive connecting sheet; penetrating the design depth of the conductive connecting sheet by using a hard needle to pin the conductive connecting sheet on the pole; and according to a set process, the conductive connecting sheet and the battery cell pole are firmly welded by using laser welding. By adopting the technical scheme, the conductive connecting sheet is pinned on the electric core pole by using the needling technology and then welded, so that the incidence rate of poor welding between the conductive connecting sheet and the electric core pole in the power battery module is reduced, the welding quality is improved, and the safety and the reliability of a product are further improved.
Description
Technical Field
The invention belongs to the technical field of manufacturing of new energy automobile power batteries. More specifically, the invention relates to a welding method for a conductive connecting sheet of a power battery module.
Background
With the rapid development of the new energy automobile industry, the industry becomes a strategic emerging industry of countries in the world.
The new energy automobile is provided with electric energy by a battery energy storage device, and a battery system generally comprises a battery PACK, a battery management system, a wire harness, a high-voltage distribution box, an auxiliary device and the like. The battery PACK generally comprises a battery module, a battery management system sampling system, a wire harness, an auxiliary device and the like. There are also battery systems with only one battery PACK.
The battery module comprises a battery module structural member, a battery core, a conductive connecting sheet, a sampling line, a connector assembly and the like. In the battery module, the series-parallel connection of the battery cores is mainly realized by welding battery poles to the conductive connecting sheets.
The conductive connecting sheet is welded by ultrasonic welding, resistance welding, laser welding and the like. For the welding of conductive connection tabs, the reliability of their connection and the safety of the battery are of the greatest concern to the manufacturer.
In the prior art, the weld terminals of the battery are arranged in a plane, and the weld areas of the conductive tabs are also arranged in a plane. However, due to the assembly process and the dimensional tolerances of the components, the terminal welding surfaces of the battery core are not exactly distributed on a plane, and at some welding points, the conductive tab and the terminal welding surfaces of the battery are spaced apart, whereas the distance between the conductive tab and the terminal, which can be effectively welded by a laser welder, is limited.
In order to reduce the influence of the gap between the conductive connecting sheet and the cell post on the welding quality, some tools for pressing the conductive connecting sheet to the cell post have been developed in the prior art, for example, patent document 201710316090.9 discloses a device for pressing contact surfaces at different positions by means of spring contacts.
However, in the above-mentioned prior art, the compressed area is not a welding point, and therefore, the tight contact between the conductive connecting sheet and the cell post during welding cannot be ensured. Therefore, in the prior art, a large amount of poor welding such as cold joint, false welding, oxidation and the like cannot be avoided, and quality and potential safety hazards are caused.
Disclosure of Invention
The invention provides a welding method of a conductive connecting sheet of a power battery module, and aims to improve the welding quality of the conductive connecting sheet and a battery core pole in the power battery module.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention discloses a welding method of a conductive connecting sheet of a power battery module, which comprises the following steps:
step one, arranging the battery cores according to a design position;
placing two end plates 2 at two ends of the battery core arrangement; welding the side panel and the end plate of the module under a set pressure;
thirdly, placing the top plastic support at the top end of the battery module according to the designed position;
placing the conductive connecting sheet according to a design position;
using a tool, lightly hammering a conductive connecting sheet above each pole to attach the poles;
sixthly, penetrating the design depth of the conductive connecting sheet by using a hard needle to pin the conductive connecting sheet on the pole;
step seven, according to the set process, using laser welding to firmly weld the conductive connecting sheet and the battery cell pole;
and then subsequent processing is performed.
The battery core comprises 12 square hard-shell battery cell modules of 43 Ah3.6V.
The tool is a bakelite block.
According to the technical scheme, the conductive connecting sheet is pinned on the cell pole by using a needling technology and then welded, so that the incidence rate of poor welding between the conductive connecting sheet and the cell pole in the power battery module is reduced, the welding quality is improved, and the safety and the reliability of a product are further improved.
Drawings
The contents of the drawings and the reference numbers in the drawings are briefly described as follows:
FIG. 1 is a schematic diagram of the relative positions of a battery cell and a conductive tab of the present invention;
FIG. 2 is a schematic diagram showing the relative positions of a battery cell, a conductive connecting sheet and a top plastic support according to the present invention;
FIG. 3 is a schematic view of a battery module according to the present invention;
fig. 4 is a schematic top view of the present invention.
Labeled as:
1. battery core, 2, end plate, 3, module side board, 4, top plastic support, 5, electrically conductive connection piece, 6, utmost point post.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
The structure of the invention shown in fig. 1 to 4 is a welding structure of a conductive connecting sheet of a power battery module. The invention provides a welding method of the structure.
In order to overcome the defects of the prior art and achieve the aim of improving the welding quality of a conductive connecting sheet and a battery core pole in a power battery module, the invention adopts the technical scheme that:
the invention discloses a welding method of a conductive connecting sheet of a power battery module, which comprises the following steps:
step one, arranging the battery cores 1 according to a design position (the arrangement position is shown in figure 1);
placing two end plates 2 at two ends of the battery core arrangement; welding the side panel 3 and the end plate 2 of the module under a set pressure;
thirdly, placing the top plastic support 4 at the top end of the battery module according to a designed position (the arrangement position is shown in figure 2);
step four, placing the conductive connecting sheet 5 according to a design position (the arrangement position is shown in figure 2);
using a tool to lightly hammer the conductive connecting sheet 5 above each pole 6 to enable the conductive connecting sheet to be attached; the tool can adopt a bakelite block;
sixthly, penetrating the design depth of the conductive connecting sheet 5 by using a hard needle to pin the conductive connecting sheet 5 on the pole 6;
step seven, according to the set process, the conductive connecting sheet 5 and the battery cell pole 6 are firmly welded by laser welding;
and then subsequent processing is performed.
According to the invention, the conductive connecting sheet is pinned on the battery cell pole by using a needling technology and then welded, so that the incidence rate of poor welding is reduced, and the safety and the reliability are improved.
The battery core 1 comprises 12 square hard-shell battery cell modules of 43 Ah3.6V.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (3)
1. A welding method for a conductive connecting sheet of a power battery module is characterized by comprising the following steps: the welding method comprises the following steps:
step one, arranging the battery cores (1) according to a design position;
placing two end plates (2) at two ends of the battery core arrangement; welding the side panel (3) of the module with the end plate (2) under a set pressure;
thirdly, placing the top plastic support (4) at the top end of the battery module according to a designed position;
placing the conductive connecting sheet (5) according to a design position;
using a tool to lightly hammer the conductive connecting sheet (5) above each pole column (6) to attach the pole columns;
sixthly, penetrating the design depth of the conductive connecting sheet (5) by using a hard needle to pin the conductive connecting sheet (5) on the pole (6);
step seven, according to the set process, firmly welding the conductive connecting sheet (5) and the battery cell pole (6) by using laser welding;
and then subsequent processing is performed.
2. The power battery module conductive connection tab welding method of claim 1, wherein: the battery core (1) comprises 12 square hard-shell battery core modules of 43 Ah3.6V.
3. The power battery module conductive connection tab welding method of claim 1, wherein: the tool is a bakelite block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910891033.2A CN110660954A (en) | 2019-09-20 | 2019-09-20 | Welding method for conductive connecting sheet of power battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910891033.2A CN110660954A (en) | 2019-09-20 | 2019-09-20 | Welding method for conductive connecting sheet of power battery module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110660954A true CN110660954A (en) | 2020-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910891033.2A Pending CN110660954A (en) | 2019-09-20 | 2019-09-20 | Welding method for conductive connecting sheet of power battery module |
Country Status (1)
| Country | Link |
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| CN (1) | CN110660954A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839148A (en) * | 2020-06-05 | 2021-12-24 | 欣旺达电动汽车电池有限公司 | Battery module and bus welding method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560263A (en) * | 2013-11-08 | 2014-02-05 | 宁德时代新能源科技有限公司 | Assembling process of battery module |
| CN108201911A (en) * | 2016-12-16 | 2018-06-26 | 姚晓宁 | A kind of Ceramic Composite toothed plate of jaw crusher and preparation method thereof |
-
2019
- 2019-09-20 CN CN201910891033.2A patent/CN110660954A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560263A (en) * | 2013-11-08 | 2014-02-05 | 宁德时代新能源科技有限公司 | Assembling process of battery module |
| CN108201911A (en) * | 2016-12-16 | 2018-06-26 | 姚晓宁 | A kind of Ceramic Composite toothed plate of jaw crusher and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839148A (en) * | 2020-06-05 | 2021-12-24 | 欣旺达电动汽车电池有限公司 | Battery module and bus welding method thereof |
| CN113839148B (en) * | 2020-06-05 | 2023-09-12 | 欣旺达电动汽车电池有限公司 | Battery module and busbar welding method thereof |
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Application publication date: 20200107 |