CN113523537A - Battery case flow channel partition welding process based on harmonica-shaped section bar - Google Patents
Battery case flow channel partition welding process based on harmonica-shaped section bar Download PDFInfo
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- CN113523537A CN113523537A CN202110891769.7A CN202110891769A CN113523537A CN 113523537 A CN113523537 A CN 113523537A CN 202110891769 A CN202110891769 A CN 202110891769A CN 113523537 A CN113523537 A CN 113523537A
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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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
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Abstract
The invention discloses a battery shell flow channel partition welding process based on harmonica-shaped section bars, which comprises the following steps of: fixing the harmonica-shaped section bar to be welded on a workbench, machining off rib positions of the section bar according to a design machine, and ensuring that no residue exists at the machining rib positions; placing the partition structure at the position to be welded according to the design and accurately positioning to ensure that the partition structure is closely matched with the upper side and the lower side of the flow channel; welding the partition structure by using a friction stir welding head with the fusion depth of not less than 2mm, so that a process hole formed after welding is reserved in the middle of the partition structure; carrying out repair welding process hole and welding end caps at two ends on the section bar with the welded partition structure to obtain a primary shell finished product; and (4) carrying out air tightness test on the primary shell finished product, obtaining a shell finished product if the test is passed, and otherwise, carrying out repair welding on the leakage position. The remarkable effects are as follows: the one-time pass rate of the airtight test of the product is greatly improved, and the thermal deformation is not obvious.
Description
Technical Field
The invention relates to the technical field of new energy automobile accessory processing, in particular to a battery shell flow channel partition welding process based on harmonica-shaped profiles.
Background
At present, the power battery for the automobile basically comprises the following systems: battery module, battery management system, thermal management system, electric and mechanical system. The battery thermal management system is a set of management system for ensuring that a battery system works in a proper temperature range from the aspect of use, and mainly comprises a shell, a heat transfer medium, monitoring equipment and the like. The cooling performance of the power battery directly affects the efficiency of the battery, and also affects the service life and the use safety of the battery. There are four conventional cooling methods: natural cooling, forced air cooling, liquid cooling and direct cooling.
In order to reduce the weight and volume of the liquid cooling plate when liquid cooling is used, chinese patent CN207282666U discloses an ultra-thin friction stir welding type aluminum alloy liquid cooling plate, which forms a flow channel for the flow of cooling liquid in the battery case by extruding a profile. The traditional processing technology of the battery shell based on the liquid cooling plate comprises the following steps: the method comprises the steps of welding extruded single section bars into harmonica-shaped large flat plates by friction welding to form a main body of a shell, then machining off part of ribs to form a required shape, and then welding and separating in a cavity of the section bars as required to enable cooling liquid to flow in a specified flowing direction.
However, in the above process, after the friction welding is used for welding the partition, the process hole of the friction welding needs to be repaired and welded by using argon arc welding, but the repair welding position is deformed by heating due to argon arc welding, and leakage occurs when the repair welding position enters the field during the air tightness test, so that multiple repair welding needs to be performed. The thermal deformation is further aggravated by the multiple repair welding, and even the whole plate is scrapped.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a battery shell flow channel partition welding process based on harmonica-shaped sectional materials, which effectively improves the once-through rate of air tightness detection after repair welding of process holes and effectively controls thermal deformation caused by welding by improving the welding process.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a battery case runner cuts off welding process based on harmonica shape section bar which the key lies in: the method comprises the following steps:
step 1, fixing a harmonica-shaped section bar to be welded on a workbench, machining off rib positions of the section bar according to a design machine, and ensuring that no residue exists at the machining rib positions;
step 2, placing the partition structure at the position to be welded according to the design and accurately positioning to ensure that the partition structure is closely matched with the upper side and the lower side of the flow channel;
step 3, welding the partition structure by using a friction stir welding head with the fusion depth not less than 2mm, wherein the friction stir welding head is welded from one end of the partition structure to the other end during welding, and is welded to the middle part of the partition structure in a turning way after reaching the other end of the partition structure, so that a process hole formed after welding is reserved in the middle of the partition structure;
step 4, performing repair welding process holes and welding plugs at two ends on the section bar with the welded partition structure to obtain a primary shell finished product;
and 5, carrying out air tightness test on the primary shell finished product, obtaining a shell finished product if the test is passed, and otherwise, carrying out repair welding on a leakage position.
Furthermore, the harmonica-shaped section is formed by welding a plurality of extruded section monomers with consistent structures.
Furthermore, after the single extruded section is welded, the gap of the welding position is smaller than 0.5mm, the height difference is smaller than 0.5mm, and the front side and the back side of the single extruded section are welded.
Further, the welding parameters when the extruded profile single body is spliced and welded to form the harmonica-shaped profile are as follows: the feeding speed of the friction welding stirring head is 800-1200 mm/min, the rotating speed is 1300-1600 r/min, and the flatness after welding is less than 2 mm.
Further, the width of the shaft shoulder of the friction stir welding head and the width of the partition structure in the step 4 satisfy the following relational expression:
G＝Z*2-2，
wherein G is the width of the partition structure, and Z is the width of the shaft shoulder of the friction stir welding drill bit.
Further, in the step 4, the welding parameters of the friction stir welding head are as follows: the feeding speed is 800-1200 mm/min, and the rotating speed is 1300-1600 r/min.
The invention has the following remarkable effects:
according to the invention, the partition structure is widened, the friction welding is used for welding from one end of the partition joint to the other end, the friction welding is turned around and welded to the middle of the partition structure after reaching the end part of the partition structure, the friction welding process hole is positioned in the middle of the partition structure, and the partition structure and the harmonica plate section are formed into a whole through friction welding at the position, so that the one-time passing rate of the airtightness test after the welding process hole is greatly improved, and the thermal deformation is not obvious.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a schematic structural view of the harmonica profile;
FIG. 3 is a front view of the harmonica profile;
FIG. 4 is a left side view of the harmonica profile
FIG. 5 is a sectional view A-A of FIG. 4;
fig. 6 is a schematic view of a welding path of the partition structure.
Detailed Description
The following provides a more detailed description of the embodiments and the operation of the present invention with reference to the accompanying drawings.
As shown in fig. 1, a welding process for blocking a flow channel of a battery case based on harmonica-shaped section bars comprises the following steps:
step 1, fixing a harmonica-shaped section bar 10 to be welded on a workbench, machining off rib positions of the section bar according to a design machine, and ensuring that no residue exists at the machining rib positions;
step 2, placing the partition structure 20 at the position to be welded according to the design and accurately positioning to ensure that the partition structure 20 is closely matched with the upper side and the lower side of the flow channel, as shown in fig. 2-5;
step 3, welding the partition structure 20 by using a friction stir welding head with the penetration of not less than 2mm, wherein the friction stir welding head is welded from one end of the partition structure 20 to the other end during welding, and is turned around and welded to the middle of the partition structure 20 after reaching the other end of the partition structure 20, and the welding path is as shown in fig. 6, so that a process hole formed after welding is reserved in the middle of the partition structure 20;
step 4, performing repair welding process holes and welding two end plugs 30 on the section bar welded with the partition structure 20 to obtain a primary shell finished product;
in this embodiment, the width of the shaft shoulder of the friction stir welding head in step 4 and the width of the partition structure 20 satisfy the following relation:
G＝Z*2-2，
wherein G is the width of the partition structure 20 and Z is the shoulder width of the friction stir welding drill bit.
During welding, the welding parameters of the stirring friction welding head are as follows: the feeding speed is 800-1200 mm/min, and the rotating speed is 1300-1600 r/min.
And 5, carrying out air tightness test on the primary shell finished product, obtaining a shell finished product if the test is passed, and otherwise, carrying out repair welding on a leakage position.
In this example, the harmonica-shaped profile 10 is formed by welding a plurality of extrusion profile monomers 11 with the same structure, as shown in fig. 2 to 5, after the extrusion profile monomers 11 are welded, the gap between the welding positions is smaller than 0.5mm, the height difference is smaller than 0.5mm, the front and back surfaces of the extrusion profile monomers 11 are all welded, and the welding parameters when the extrusion profile monomers 11 are welded to form the harmonica-shaped profile 10 are as follows: the feeding speed of the friction welding stirring head is 800-1200 mm/min, the rotating speed is 1300-1600 r/min, and the flatness after welding is less than 2 mm.
In the embodiment, the partition structure 20 is widened, and is welded from one end of the partition structure to the other end by friction welding, and is turned around and welded to the middle of the partition structure 20 after reaching the end of the partition structure 20, so that the friction welding process hole is located in the middle of the partition structure 20, the partition structure 20 and the harmonica plate profile are formed into a whole by friction welding, and therefore the airtight one-time passing rate of the partition position after the welding process hole is increased from 10% to 95%, and the thermal deformation is not obvious.
The technical solution provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. A battery case flow channel partition welding process based on harmonica-shaped sectional materials is characterized by comprising the following steps:
step 1, fixing a harmonica-shaped section bar to be welded on a workbench, machining off rib positions of the section bar according to a design machine, and ensuring that no residue exists at the machining rib positions;
step 2, placing the partition structure at the position to be welded according to the design and accurately positioning to ensure that the partition structure is closely matched with the upper side and the lower side of the flow channel;
step 3, welding the partition structure by using a friction stir welding head with the fusion depth not less than 2mm, wherein the friction stir welding head is welded from one end of the partition structure to the other end during welding, and is welded to the middle part of the partition structure in a turning way after reaching the other end of the partition structure, so that a process hole formed after welding is reserved in the middle of the partition structure;
step 4, performing repair welding process holes and welding plugs at two ends on the section bar with the welded partition structure to obtain a primary shell finished product;
and 5, carrying out air tightness test on the primary shell finished product, obtaining a shell finished product if the test is passed, and otherwise, carrying out repair welding on a leakage position.
2. The harmonica-shaped profile-based battery case flow channel partition welding process as claimed in claim 1, wherein: the harmonica-shaped section is formed by welding a plurality of extruded section monomers with consistent structures.
3. The harmonica-shaped profile-based battery case flow channel partition welding process as claimed in claim 2, wherein: after the single extruded section is welded, the gap between the welding positions is smaller than 0.5mm, the height difference is smaller than 0.5mm, and the front side and the back side of the single extruded section are welded.
4. The harmonica-shaped profile-based battery case flow channel partition welding process as claimed in claim 2 or 3, wherein: the welding parameters when the extruded profile single body is spliced and welded into the harmonica-shaped profile are as follows: the feeding speed of the friction welding stirring head is 800-1200 mm/min, the rotating speed is 1300-1600 r/min, and the flatness after welding is less than 2 mm.
5. The harmonica-shaped profile-based battery case flow channel partition welding process as claimed in claim 1, wherein: in the step 4, the width of the shaft shoulder of the friction stir welding head and the width of the partition structure satisfy the following relational expression:
G＝Z*2-2，
wherein G is the width of the partition structure, and Z is the width of the shaft shoulder of the friction stir welding drill bit.
6. The harmonica-shaped profile-based battery case flow channel partition welding process as claimed in claim 1, wherein: the welding parameters of the friction stir welding head in the step 4 are as follows: the feeding speed is 800-1200 mm/min, and the rotating speed is 1300-1600 r/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110891769.7A CN113523537A (en) | 2021-08-04 | 2021-08-04 | Battery case flow channel partition welding process based on harmonica-shaped section bar |
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| CN202110891769.7A CN113523537A (en) | 2021-08-04 | 2021-08-04 | Battery case flow channel partition welding process based on harmonica-shaped section bar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114843660A (en) * | 2022-06-06 | 2022-08-02 | 重庆新铝时代科技股份有限公司 | Manufacturing process of new energy battery box based on extruded section |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11192564A (en) * | 1998-01-05 | 1999-07-21 | Nippon Light Metal Co Ltd | Joining method of extruded shape |
| CN106271023A (en) * | 2015-05-27 | 2017-01-04 | 上海航天设备制造总厂 | A kind of method using agitating friction weldering that cold drawing is sealed |
| CN110802316A (en) * | 2019-11-08 | 2020-02-18 | 广东和胜新能源汽车配件有限公司 | Friction stir welding process for battery pack shell |
| CN111799421A (en) * | 2020-07-31 | 2020-10-20 | 辽宁忠旺铝合金精深加工有限公司 | Integrated lower box body of standard battery B box |
| CN213124552U (en) * | 2020-07-22 | 2021-05-04 | 上海凌云工业科技有限公司凌云汽车技术分公司 | Cooling device for new energy automobile battery |
-
2021
- 2021-08-04 CN CN202110891769.7A patent/CN113523537A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11192564A (en) * | 1998-01-05 | 1999-07-21 | Nippon Light Metal Co Ltd | Joining method of extruded shape |
| CN106271023A (en) * | 2015-05-27 | 2017-01-04 | 上海航天设备制造总厂 | A kind of method using agitating friction weldering that cold drawing is sealed |
| CN110802316A (en) * | 2019-11-08 | 2020-02-18 | 广东和胜新能源汽车配件有限公司 | Friction stir welding process for battery pack shell |
| CN213124552U (en) * | 2020-07-22 | 2021-05-04 | 上海凌云工业科技有限公司凌云汽车技术分公司 | Cooling device for new energy automobile battery |
| CN111799421A (en) * | 2020-07-31 | 2020-10-20 | 辽宁忠旺铝合金精深加工有限公司 | Integrated lower box body of standard battery B box |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114843660A (en) * | 2022-06-06 | 2022-08-02 | 重庆新铝时代科技股份有限公司 | Manufacturing process of new energy battery box based on extruded section |
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