CN111864173B - Battery pack welding process - Google Patents
Battery pack welding process Download PDFInfo
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- CN111864173B CN111864173B CN202010689662.XA CN202010689662A CN111864173B CN 111864173 B CN111864173 B CN 111864173B CN 202010689662 A CN202010689662 A CN 202010689662A CN 111864173 B CN111864173 B CN 111864173B
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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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Abstract
The invention discloses a battery pack welding process, which comprises the following steps: forming the battery pack according to the design process and the connection requirement of the product, and fixing the battery pack; determining welding process parameters according to the determined welding type and the structural characteristics of the battery pack; selecting and assembling a connecting aluminum busbar; according to the selected specification of the battery cell and the connection mode of the aluminum busbar, the contact part welded on the battery cell and the aluminum busbar is designed and hollowed out, and a preset welding range is reserved; leaving a welding area and a welding width; and according to preset welding requirements, debugging the welding machine and combining a welding fixture to perform point-to-point welding. The scheme of the invention optimizes the welding process of the product, reduces the total power of a welding machine, reduces the thickness of the welding point of the connecting sheet of the large and medium power battery pack, ensures the welding firmness and reliability of the large and medium power battery pack product, ensures the capability of bearing current, saves the cost and solves the waste caused by difficult process and quality redundancy in the production process of small and medium enterprises.
Description
Technical Field
The invention relates to the technical field of battery pack welding, in particular to a battery pack welding process.
Background
At present, the large-current battery pack has the defects of large volume, large power, imperfect welding process, overlarge thickness of welding points of battery pack connecting sheets, incapability of guaranteeing the capacity of carrying current of the battery pack, incapability of guaranteeing welding firmness and reliability, influence on product quality and cause redundant waste of products.
Disclosure of Invention
The invention mainly aims to provide a battery pack welding process, aims to optimize the welding process of products, solves the problem of welding a high-current battery pack, and realizes high-current discharge of a power battery.
In order to achieve the above object, the present invention provides a battery pack welding process, comprising the steps of:
forming the battery pack according to the design process and the connection requirement of the product, and fixing the battery pack;
determining welding process parameters according to the determined welding type and the structural characteristics of the battery pack, wherein the welding process parameters at least comprise welding current;
selecting and assembling a connecting aluminum busbar;
according to the selected specification of the battery cell and the connection mode of the aluminum busbar, the contact part welded on the battery cell and the aluminum busbar is designed and hollowed out, and a preset welding range is reserved;
leaving a welding area and a welding width;
and according to preset welding requirements, debugging the welding machine and combining a welding fixture to perform point-to-point welding.
Optionally, the welding type is laser welding; the aluminum busbar is an aluminum busbar with a purity of 1060.
Optionally, according to the selected specification of the battery cell and the connection mode of the aluminum busbar, the step of designing and hollowing out the contact part welded between the battery cell and the aluminum busbar and reserving a preset welding range includes:
according to the specification of the positive and negative electrode lugs of the battery cell, the width of the aluminum row connected with the battery pack is calculated and designed according to the characteristic of the overcurrent of the conductor, and the contact part of the battery cell and the busbar is welded to be designed and hollowed out, so that a welding range of 1mm is reserved.
Optionally, the preset welding requirements include: the battery pack product process connection mode and the characteristics of an aluminum row material and a laser welding machine.
Optionally, the step of debugging the welding machine and performing point-to-point welding with the welding fixture according to the preset welding requirement includes:
and calculating the sectional area through which the current passes and the overcurrent capacity of the welding point according to a preset electrical formula and material characteristics, and controlling the thickness of the welding point of the battery pack connecting piece and the power of the laser welding machine.
Optionally, the step of controlling the power of the laser welder includes:
controlling the power of the welding machine to be between 1500 and 2000W according to the purity of the aluminum busbar, and controlling the tension after welding to be above 6 Kg.
According to the battery pack welding process provided by the embodiment of the invention, the battery pack is molded according to the design process and the connection requirement of the product, and the battery pack is fixed; determining welding process parameters according to the determined welding type and the structural characteristics of the battery pack, wherein the welding process parameters at least comprise welding current; selecting and assembling a connecting aluminum busbar; according to the selected specification of the battery cell and the connection mode of the aluminum busbar, the contact part welded on the battery cell and the aluminum busbar is designed and hollowed out, and a preset welding range is reserved; leaving a welding area and a welding width; and according to preset welding requirements, debugging the welding machine and combining a welding fixture to perform point-to-point welding. Therefore, through the scheme, the welding process of the product is optimized, the total power of a welding machine is reduced, the thickness of the welding point of the connecting sheet of the large and medium power battery pack is reduced, the welding firmness and reliability of the large and medium power battery pack product are ensured, the current carrying capacity is ensured, meanwhile, the cost is saved, the excessive waste of quality is reduced, the waste caused by the difficult process problem and the quality redundancy in the production process of small and medium enterprises is solved, and the welding problem of the large current battery pack is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a battery pack welding process according to an embodiment of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Specifically, referring to fig. 1, fig. 1 is a schematic flow chart of a battery pack welding process according to an embodiment of the invention.
As shown in fig. 1, the invention provides a battery pack welding process, which is based on the prior welding technology, and the parameters and the structure of welding materials are correspondingly adjusted to achieve the purpose of using the whole project.
The existing welding process is to directly perform penetration welding of the aluminum row, so that the thickness of a welding point of a battery pack connecting sheet is too large, the capacity of carrying current of the battery pack cannot be guaranteed, the welding firmness and reliability cannot be guaranteed, the quality of a product is affected, and the redundancy of the product is caused.
After improvement, the scheme of the embodiment can reduce the power of a welding machine, enhance the welding firmness and enable the contact between the aluminum row and the battery cell electrode lug to be more compact. The specific welding process is as follows: the method comprises the steps of forming the battery pack according to the design process and the connection requirement of the product, fixing the battery pack, assembling and connecting an aluminum row, debugging a laser welding machine, performing trial welding, confirming the tensile force and performing batch product welding machine.
Specifically, the battery pack welding process comprises the following steps:
s1, forming the battery pack according to the design process and the connection requirement of the product, and fixing the battery pack;
s2, determining welding process parameters according to the determined welding type and structural characteristics of the battery pack, wherein the welding process parameters at least comprise welding current, and can also comprise welding voltage, welding rod type (or brand), diameter, welding power supply type, welding layer number, channel number, inspection method and the like;
the welding current can be referred to the following criteria: the current passed through the metal conductor per square cross-sectional area was 5A.
S3, selecting and assembling a connecting aluminum busbar;
in this embodiment, a laser welder is selected for laser welding, and an aluminum busbar connection is selected for welding. Wherein, the aluminum busbar is an aluminum busbar with the purity of 1060.
The operation is determined according to the material, the brand, the chemical composition, the structure type of the weldment and the welding performance requirement of the welded battery pack.
At present, in order to achieve the purposes of energy conservation and emission reduction, the current requirement on the power battery is high, the charging speed requirement is high, and the common conductive connector cannot bear such large voltage, so that the aluminum busbar connection is adopted at present, and the aluminum busbar connection can adapt to high-strength current and voltage to improve the power storage capacity.
The scheme of the embodiment is suitable for a high-current laser welding technology.
S4, according to the selected specification of the battery cell and the connection mode of the aluminum busbar, designing and hollowing out the contact part welded between the battery cell and the aluminum busbar, and reserving a preset welding range;
specifically, the method comprises the following steps:
according to the specification of the positive and negative lugs of the battery cell, the width of the aluminum row for connecting the battery pack is calculated and designed according to the characteristic of the overcurrent of the conductor, for example: in the 100Ah battery pack, the working current is 100A, the thickness of the aluminum row is 2mm, and the width of the aluminum sheet is 12-15 mm according to the overcurrent characteristic of the conductor plus the allowance.
Then, the contact part of the battery core and the busbar is welded and hollowed out, and a welding range of 1mm is reserved.
S5, reserving a welding area and a welding width;
s6, according to preset welding requirements, debugging the welding machine and combining the welding fixture to perform point-to-point welding.
Wherein, the preset welding requirements include: the battery pack product process connection mode and the characteristics of an aluminum row material and a laser welding machine.
Specifically, as an implementation manner, the step of debugging the welding machine and performing point-to-point welding by combining the welding fixture according to the preset welding requirement includes:
according to a preset electrical formula and material characteristics, the sectional area of current passing through and the overcurrent capacity of a welding point (the current passing through per square sectional area is 5A) are calculated, the thickness of the welding point of a battery pack connecting piece and the power of a laser welding machine are controlled, the thickness of the welding point of a high-medium power battery pack connecting piece is mainly reduced, and the capacity of carrying current is ensured.
The welding needs accurate butt joint and can not be in cold joint. The welding point thickness of the connecting sheet and the power of the laser welding machine determine the welding time and the welding current, and the change of the welding temperature rise is caused by the heat conduction and chemical feedback of the battery.
The aluminum busbar is of which the purity is 1060, the power of the welding machine is controlled to be between 1500W and 2000W, and the tension after welding is more than 6Kg according to the purity of the aluminum busbar.
According to the battery pack welding process provided by the embodiment of the invention, the battery pack is molded according to the design process and the connection requirement of the product, and the battery pack is fixed; determining welding process parameters according to the determined welding type and the structural characteristics of the battery pack, wherein the welding process parameters at least comprise welding current; selecting and assembling a connecting aluminum busbar; according to the selected specification of the battery cell and the connection mode of the aluminum busbar, the contact part welded on the battery cell and the aluminum busbar is designed and hollowed out, and a preset welding range is reserved; leaving a welding area and a welding width; and according to preset welding requirements, debugging the welding machine and combining a welding fixture to perform point-to-point welding. Therefore, through the scheme, the welding process of the product is optimized, the total power of a welding machine is reduced, the thickness of the welding point of the connecting sheet of the large and medium power battery pack is reduced, the welding firmness and reliability of the large and medium power battery pack product are ensured, the current carrying capacity is ensured, meanwhile, the cost is saved, the excessive waste of quality is reduced, the waste caused by the difficult process problem and the quality redundancy in the production process of small and medium enterprises is solved, and the welding problem of the large current battery pack is solved.
In practical application, when designing a high-current product, considering the carrying capacity and the actual power of the equipment, a 2000W power laser welding machine is recommended to meet the requirements, 3000-5000W laser welding machine is required before improvement, an aluminum busbar with higher 1060 purity is adopted, the laser welding machine is subjected to proper welding power debugging on the basis of the original power (the welding power is adjusted to be between 1500W and 2000W according to the material purity, and the tension after welding is more than 6 Kg).
The performance test conditions of the final product were as follows:
the test is performed according to the improved result as follows:
overcurrent test: and according to the electroengineering principle and the actual test overcurrent condition, the test structure is qualified according to the theoretical value and the actual comparison.
And (3) falling: after the welding is finished, the 1m height drop test is carried out on the 6 surfaces for 12 times, and as a result, the welding position is free from cracking and damage, and the result is qualified.
And (3) tensile force test: according to the tensile test requirement of the electronic and electrical products, the welding piece is generally 2.5Kg of tensile value, the actual test after welding is more than 5Kg, and the result is qualified.
Vibration test: and carrying out relevant product test according to vibration requirements, and judging that the result is qualified.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the specification and drawings of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (1)
1. A battery pack welding process, comprising the steps of:
forming the battery pack according to the design process and the connection requirement of the product, and fixing the battery pack;
determining welding process parameters according to the determined welding type and structural characteristics of the battery pack, wherein the welding process parameters at least comprise welding current, and the welding current refers to the following standard: the current passing through each square sectional area of the metal conductor is 5A, and the welding type is laser welding;
selecting and assembling a connecting aluminum busbar, wherein the aluminum busbar is an aluminum busbar with the purity of 1060;
according to the selected specification of the battery cell and the connection mode of the aluminum busbar, the contact part welded on the battery cell and the aluminum busbar is designed and hollowed out, and a preset welding range is reserved;
leaving a welding area and a welding width;
according to the preset welding requirements, debugging a welding machine and combining a welding fixture to perform point-to-point welding, wherein the preset welding requirements comprise: the battery pack product technology connection mode and the characteristics of an aluminum row material and a laser welding machine;
according to the specification of selecting the electric core and the connection mode of the aluminum busbar, the contact part welded between the electric core and the aluminum busbar is designed and hollowed out, and the step of reserving the preset welding range comprises the following steps:
according to the specification of the positive and negative electrode lugs of the battery cell, calculating and designing the width of the aluminum row connected with the battery pack according to the characteristic of the overcurrent of the conductor, designing and hollowing out the contact part welded between the battery cell and the busbar, and reserving a welding range of 1 mm;
the step of debugging the welding machine and combining the welding fixture to perform point-to-point welding according to the preset welding requirement comprises the following steps:
according to a preset electrical formula and material characteristics, calculating the cross section area through which current passes and the overflow capacity of a welding point, controlling the thickness of the welding point of a battery pack connecting sheet and the power of a laser welding machine, wherein the overflow capacity is 5A of current passing per square cross section area, controlling the power of the welding machine to be 1500W-2000W according to the purity of the aluminum busbar, and the tension after welding is more than 6 Kg.
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| CN206471393U (en) * | 2017-02-28 | 2017-09-05 | 北京新能源汽车股份有限公司 | Battery module and electric automobile |
| CN107425173A (en) * | 2017-08-15 | 2017-12-01 | 上海卡耐新能源有限公司 | A kind of soft pack cell module welding structure |
| CN110459726A (en) * | 2018-05-08 | 2019-11-15 | 欣旺达电动汽车电池有限公司 | 18650 aluminium dish laser welding schemes |
| CN111293270A (en) * | 2020-02-25 | 2020-06-16 | 四川国创成电池材料有限公司 | Battery core tab connection structure, soft-packaged battery, electric equipment, electric vehicle and power station |
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