CN111864173A - Battery pack welding process - Google Patents
Battery pack welding process Download PDFInfo
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- CN111864173A CN111864173A CN202010689662.XA CN202010689662A CN111864173A CN 111864173 A CN111864173 A CN 111864173A CN 202010689662 A CN202010689662 A CN 202010689662A CN 111864173 A CN111864173 A CN 111864173A
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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 a 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 and connecting an aluminum bus bar; according to the selected specification of the battery cell and the connection mode of the aluminum bus bar, the contact part welded between the battery cell and the aluminum bus bar is designed to be hollowed, and a preset welding range is reserved; reserving a welding area and a welding width; and debugging the welding machine and combining the welding fixture to carry out point-to-point welding according to the preset welding requirement. The scheme of the invention optimizes the welding process of the product, reduces the total power of the 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 current bearing capacity, saves the cost, and solves the processing difficulty and the waste caused by quality redundancy in the production process of medium and small 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 is large in size and power, and the welding process is imperfect, so that the thickness of a welding point of a battery pack connecting sheet is too large, the current bearing capacity of the battery pack cannot be guaranteed, the welding firmness and reliability cannot be guaranteed, the product quality is influenced, and the product redundancy is wasted.
Disclosure of Invention
The invention mainly aims to provide a battery pack welding process, which aims to optimize the product welding process, solve the welding problem of a high-current battery pack and realize 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 a 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 and connecting an aluminum bus bar;
according to the selected specification of the battery cell and the connection mode of the aluminum bus bar, the contact part welded between the battery cell and the aluminum bus bar is designed to be hollowed, and a preset welding range is reserved;
reserving a welding area and a welding width;
And debugging the welding machine and combining the welding fixture to carry out point-to-point welding according to the preset welding requirement.
Optionally, the welding type is laser welding; the aluminum bus bar is an aluminum bus bar with the purity of 1060.
Optionally, according to the specification selected for use of the battery cell and the connection mode of the aluminum busbar, the contact portion welded between the battery cell and the aluminum busbar is hollowed out, and the step of reserving the preset welding range includes:
according to the specifications of positive and negative electrode lugs of the battery cell, the width of a battery pack connecting aluminum bar is calculated and designed according to the overcurrent characteristic of a conductor, and the contact part welded between the battery cell and the busbar is hollowed out to leave a welding range of 1 mm.
Optionally, the preset welding requirements include: the battery pack product process connection mode and the characteristics of the aluminum bar material and the laser welding machine.
Optionally, 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:
and calculating the sectional area of the current passing through 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 sheet and the power of the laser welding machine.
Optionally, the step of controlling the power of the laser welder comprises:
And controlling the power of the welding machine to be between 1500W and 2000W according to the purity of the aluminum busbar, wherein the tension after welding is more than 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 a 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 and connecting an aluminum bus bar; according to the selected specification of the battery cell and the connection mode of the aluminum bus bar, the contact part welded between the battery cell and the aluminum bus bar is designed to be hollowed, and a preset welding range is reserved; reserving a welding area and a welding width; and debugging the welding machine and combining the welding fixture to carry out point-to-point welding according to the preset welding requirement. Therefore, by the scheme, the welding process of the product is optimized, the total power of the 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 capacity of bearing current is ensured, the cost is saved, the excessive waste of quality is reduced, the problems of difficult processing and waste caused by quality redundancy in the production process of small and medium enterprises are 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 used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a battery pack welding process according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment 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 relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of 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 present invention.
As shown in fig. 1, the present invention provides a battery welding process, which is based on the existing welding technology, and makes corresponding adjustments to the parameters and structure of the welding material, so as to achieve the purpose of using the whole project.
The existing welding process is to directly perform penetration welding of the aluminum bars, so that the thickness of a welding point of a battery pack connecting sheet is too large, the current bearing capacity of the battery pack cannot be guaranteed, the welding firmness and reliability cannot be guaranteed, the product quality is influenced, and the product redundancy and waste are caused.
This embodiment scheme is through improving the back, can reduce welding machine power, reinforcing welding firmness for it is inseparabler to let contact between aluminium row and the electric core utmost point ear. The specific welding process is as follows: forming the battery pack according to the design process and the connection requirement of the product → fixing the battery pack → installing and connecting the aluminum row → debugging the laser welding machine → trial welding → tension confirmation → carrying out the welding machine for batch products.
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 the structural characteristics of the battery pack, wherein the welding process parameters at least comprise welding current, welding voltage, welding rod type (or brand), diameter, welding power type, welding layer number, track number, inspection method and the like;
The welding current can be determined according to the following criteria: the current passing through each square cross-sectional area of the metal conductor is 5A.
S3, selecting and assembling and connecting an aluminum bus bar;
in the embodiment, a laser welding machine is selected for laser welding, and an aluminum bus bar is selected for connection for welding. Wherein, the aluminium busbar is that the purity is 1060 aluminium busbar.
During operation, the welding performance needs to be determined according to the material, the grade and the chemical composition of the welded battery pack, the structural type of a weldment and the requirement of welding performance.
At present, in order to achieve the purposes of energy conservation and emission reduction, the current requirement on a power battery is high, the requirement on the charging speed is high, and a common conductive connector cannot bear such a large voltage, so that the aluminum busbar is adopted for connection at present, and the aluminum busbar 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 bus bar, hollowing out the contact part welded between the battery cell and the aluminum bus bar, and reserving a preset welding range;
specifically, the method comprises the following steps:
according to the specifications of positive and negative electrode tabs of a battery cell, the width of a battery pack connection aluminum row is calculated and designed according to the overcurrent characteristic of a conductor, for example: the 100Ah battery pack has the working current of 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 and the allowance.
And then, designing and hollowing out the contact part welded between the battery core and the busbar, and reserving a welding range of 1 mm.
S5, reserving a welding area and a welding width;
and S6, debugging the welding machine and combining the welding clamp to weld point to point according to the preset welding requirement.
Wherein the preset welding requirements include: the battery pack product process connection mode and the characteristics of the aluminum bar material and the laser welding machine.
Specifically, as an embodiment, the step of debugging a welding machine and performing point-to-point welding by combining a welding fixture according to a preset welding requirement includes:
according to a preset electrical formula and material characteristics, the cross section area where current passes and the over-current capacity of a welding point (the current passing through each square cross section area is 5A) are calculated, the thickness of the welding point of a battery pack connecting sheet and the power of a laser welding machine are controlled, the thickness of the welding point of a large and medium power battery pack connecting sheet is mainly reduced, and the capacity of bearing current is guaranteed.
The welding needs accurate butt joint and cannot be insufficient. The thickness of the welding point 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 the chemical feedback of the battery.
The welding method comprises the following steps of welding a welding head, wherein the aluminum bus bar is 1060 in purity, the power of a welding machine is controlled to be 1500-2000W according to the purity of the aluminum bus bar, and the tension of the welded aluminum bus bar is more than 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 a 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 and connecting an aluminum bus bar; according to the selected specification of the battery cell and the connection mode of the aluminum bus bar, the contact part welded between the battery cell and the aluminum bus bar is designed to be hollowed, and a preset welding range is reserved; reserving a welding area and a welding width; and debugging the welding machine and combining the welding fixture to carry out point-to-point welding according to the preset welding requirement. Therefore, by the scheme, the welding process of the product is optimized, the total power of the 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 capacity of bearing current is ensured, the cost is saved, the excessive waste of quality is reduced, the problems of difficult processing and waste caused by quality redundancy in the production process of small and medium enterprises are solved, and the welding problem of the large-current battery pack is solved.
In practical application, when a large-current product is designed, the bearing capacity and the actual power of equipment are considered, a laser welding machine with the power of 2000W is suggested to meet the requirement, a laser welding machine with the power of 3000-5000W is required before improvement, an aluminum bus bar with the high purity of 1060 is adopted, and the laser welding machine is debugged to have proper welding power 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 final product was tested for performance as follows:
the test conditions according to the improved results were as follows:
and (3) overcurrent testing: and (4) according to an electrical engineering principle and an actual test overcurrent condition, comparing a theoretical value with the actual value, and determining that the test structure is qualified.
Dropping: after welding, 1m height drop test is carried out for 12 times on 6 surfaces, and as a result, the welded part is not cracked and damaged, and the result is qualified.
And (3) testing tension: according to the requirement of tensile test of electronic and electrical products, the tensile value of a welded part is generally 2.5Kg, the actual test after welding is more than 5Kg, and the result is qualified.
Vibration test: and performing related product tests according to the vibration requirements, wherein the result is qualified.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A battery pack welding process, comprising the steps of:
forming the battery pack according to the design process and the connection requirement of a 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 and connecting an aluminum bus bar;
according to the selected specification of the battery cell and the connection mode of the aluminum bus bar, the contact part welded between the battery cell and the aluminum bus bar is designed to be hollowed, and a preset welding range is reserved;
reserving a welding area and a welding width;
and debugging the welding machine and combining the welding fixture to carry out point-to-point welding according to the preset welding requirement.
2. The battery welding process of claim 1, wherein the welding type is laser welding; the aluminum bus bar is an aluminum bus bar with the purity of 1060.
3. The battery pack welding process according to claim 1, wherein the step of hollowing out the contact part welded between the battery cell and the aluminum busbar according to the selected specification of the battery cell and the connection mode of the aluminum busbar, and leaving a preset welding range comprises:
According to the specifications of positive and negative electrode lugs of the battery cell, the width of a battery pack connecting aluminum bar is calculated and designed according to the overcurrent characteristic of a conductor, and the contact part welded between the battery cell and the busbar is hollowed out to leave a welding range of 1 mm.
4. The battery pack welding process of claim 2, wherein the preset welding requirements include: the battery pack product process connection mode and the characteristics of the aluminum bar material and the laser welding machine.
5. The battery pack welding process according to claim 4, wherein the step of debugging a welding machine and performing point-to-point welding by combining a welding fixture according to preset welding requirements comprises the following steps:
and calculating the sectional area of the current passing through 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 sheet and the power of the laser welding machine.
6. The battery welding process of claim 5, wherein the step of controlling laser welder power comprises:
and controlling the power of the welding machine to be between 1500W and 2000W according to the purity of the aluminum busbar, wherein the tension after welding is more than 6 Kg.
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| CN202010689662.XA CN111864173B (en) | 2020-07-16 | 2020-07-16 | Battery pack welding process |
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| CN202010689662.XA CN111864173B (en) | 2020-07-16 | 2020-07-16 | Battery pack welding process |
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| CN111864173B CN111864173B (en) | 2023-05-12 |
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB226187A (en) * | 1923-12-12 | 1925-09-10 | Wilhelm Peukert | Method of welding aluminium |
| US20080131765A1 (en) * | 2006-11-10 | 2008-06-05 | Shoji Imanaga | Battery Pack and Method for Welding Cells |
| US20130161302A1 (en) * | 2010-06-14 | 2013-06-27 | Esab Ab | Method of automatically setting a welding parameter for mig/mag welding and a controller for performing the method |
| US20150122781A1 (en) * | 2013-11-04 | 2015-05-07 | Illinois Tool Works Inc. | System and method for selecting weld parameters |
| CN105789540A (en) * | 2014-12-25 | 2016-07-20 | 宁德时代新能源科技股份有限公司 | Connection sheet for battery pack |
| CN206471393U (en) * | 2017-02-28 | 2017-09-05 | 北京新能源汽车股份有限公司 | A kind of battery modules 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 |
| WO2018058781A1 (en) * | 2016-09-27 | 2018-04-05 | 中航锂电（洛阳）有限公司 | Battery module |
| CN208127292U (en) * | 2018-03-15 | 2018-11-20 | 宁德时代新能源科技股份有限公司 | Busbar connector and battery modules |
| CN208570713U (en) * | 2018-06-25 | 2019-03-01 | 深圳市拓邦锂电池有限公司 | A kind of square electric core model group |
| CN209183656U (en) * | 2018-12-03 | 2019-07-30 | 宁德时代新能源科技股份有限公司 | Secondary cell and battery modules |
| 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 |
| CN110571400A (en) * | 2019-09-20 | 2019-12-13 | 江西优特汽车技术有限公司 | power battery module bus bar and welding method thereof |
| CN210296486U (en) * | 2019-07-24 | 2020-04-10 | 维卡新能源科技(南通)有限公司 | Big overcurrent connection row and lithium ion battery pack convenient to laser welding |
| 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 |
-
2020
- 2020-07-16 CN CN202010689662.XA patent/CN111864173B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB226187A (en) * | 1923-12-12 | 1925-09-10 | Wilhelm Peukert | Method of welding aluminium |
| US20080131765A1 (en) * | 2006-11-10 | 2008-06-05 | Shoji Imanaga | Battery Pack and Method for Welding Cells |
| US20130161302A1 (en) * | 2010-06-14 | 2013-06-27 | Esab Ab | Method of automatically setting a welding parameter for mig/mag welding and a controller for performing the method |
| US20150122781A1 (en) * | 2013-11-04 | 2015-05-07 | Illinois Tool Works Inc. | System and method for selecting weld parameters |
| CN105789540A (en) * | 2014-12-25 | 2016-07-20 | 宁德时代新能源科技股份有限公司 | Connection sheet for battery pack |
| WO2018058781A1 (en) * | 2016-09-27 | 2018-04-05 | 中航锂电（洛阳）有限公司 | Battery module |
| CN206471393U (en) * | 2017-02-28 | 2017-09-05 | 北京新能源汽车股份有限公司 | A kind of battery modules 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 |
| CN208127292U (en) * | 2018-03-15 | 2018-11-20 | 宁德时代新能源科技股份有限公司 | Busbar connector and battery modules |
| 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 |
| CN208570713U (en) * | 2018-06-25 | 2019-03-01 | 深圳市拓邦锂电池有限公司 | A kind of square electric core model group |
| CN209183656U (en) * | 2018-12-03 | 2019-07-30 | 宁德时代新能源科技股份有限公司 | Secondary cell and battery modules |
| CN210296486U (en) * | 2019-07-24 | 2020-04-10 | 维卡新能源科技(南通)有限公司 | Big overcurrent connection row and lithium ion battery pack convenient to laser welding |
| CN110571400A (en) * | 2019-09-20 | 2019-12-13 | 江西优特汽车技术有限公司 | power battery module bus bar and welding method thereof |
| 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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| Publication number | Publication date |
|---|---|
| CN111864173B (en) | 2023-05-12 |
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