CN116134656A - Battery and brazing process thereof - Google Patents
Battery and brazing process thereof Download PDFInfo
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- CN116134656A CN116134656A CN202280006024.0A CN202280006024A CN116134656A CN 116134656 A CN116134656 A CN 116134656A CN 202280006024 A CN202280006024 A CN 202280006024A CN 116134656 A CN116134656 A CN 116134656A
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- brazing
- filler metal
- brazing filler
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- 238000005219 brazing Methods 0.000 title claims abstract description 281
- 238000000034 method Methods 0.000 title claims abstract description 57
- 239000000945 filler Substances 0.000 claims abstract description 135
- 239000002184 metal Substances 0.000 claims abstract description 133
- 229910052751 metal Inorganic materials 0.000 claims abstract description 132
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 65
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000005476 soldering Methods 0.000 claims description 57
- 238000002844 melting Methods 0.000 claims description 30
- 230000008018 melting Effects 0.000 claims description 30
- 238000009736 wetting Methods 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 229910052709 silver Inorganic materials 0.000 claims description 10
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 229910001128 Sn alloy Inorganic materials 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910017770 Cu—Ag Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 229910017937 Ag-Ni Inorganic materials 0.000 claims description 5
- 229910017984 Ag—Ni Inorganic materials 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- 239000011701 zinc Substances 0.000 claims description 5
- 229910052718 tin Inorganic materials 0.000 claims description 3
- 229910001092 metal group alloy Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 15
- 229910000679 solder Inorganic materials 0.000 description 114
- 238000003466 welding Methods 0.000 description 28
- 238000005516 engineering process Methods 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000004332 silver Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 3
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- QCEUXSAXTBNJGO-UHFFFAOYSA-N [Ag].[Sn] Chemical compound [Ag].[Sn] QCEUXSAXTBNJGO-UHFFFAOYSA-N 0.000 description 1
- BNOODXBBXFZASF-UHFFFAOYSA-N [Na].[S] Chemical compound [Na].[S] BNOODXBBXFZASF-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004093 laser heating Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The application discloses a brazing process of a battery, which comprises the following steps: arranging a first brazing filler metal in a first brazing area on the battery protection plate, and arranging a second brazing filler metal in a second brazing area, which is arranged on the battery protection plate and is spaced from the first brazing area; attaching the positive electrode lug of the battery cell to the first brazing filler metal, and attaching the negative electrode lug of the battery cell to the second brazing filler metal; after the first brazing filler metal is melted by heating the positive electrode lug, the first brazing filler metal is cooled and solidified so as to connect the first brazing area with the positive electrode lug; after the second brazing filler metal is melted by heating the negative electrode lug, the second brazing filler metal is cooled and solidified so as to connect the second brazing area with the negative electrode lug; the battery in the application omits the L-shaped nickel sheet, and reduces the material cost and the processing cost of the battery.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery and a brazing process thereof.
Background
In the related battery field, the connection between the battery cell and the battery protection plate is realized mainly by welding an L-shaped nickel sheet attached to the battery protection plate and a tab of the battery cell. The main problems of the connection method between the battery cell and the battery protection board are as follows: the cost of L type nickel piece self is higher and processing technology's cost is higher, generally needs to buckle L type nickel piece after L type nickel piece and electric core tab welding, has increased the equipment process, leads to current connected mode cost higher, and in buckling L type nickel piece in-process, has the higher problem of meeting an emergency, has the risk of damaging the components and parts that set up on the battery protection shield.
Disclosure of Invention
Embodiments of the present application provide a battery and a soldering process thereof, which have lower costs.
In a first aspect, embodiments of the present application provide a brazing process for a battery, including the steps of:
arranging a first brazing filler metal in a first brazing area on the battery protection plate, and arranging a second brazing filler metal in a second brazing area, which is arranged on the battery protection plate and is spaced from the first brazing area;
attaching the positive electrode lug of the battery cell to the first brazing filler metal, and attaching the negative electrode lug of the battery cell to the second brazing filler metal;
after the first brazing filler metal is melted by heating the positive electrode lug, the first brazing filler metal is cooled and solidified so as to connect the first brazing area with the positive electrode lug; and after the second brazing filler metal is melted by heating the negative electrode lug, the second brazing filler metal is cooled and solidified so as to connect the second brazing area with the negative electrode lug.
According to the embodiment, after the first brazing filler metal is arranged in the first brazing area and the positive electrode lug is attached to the first brazing filler metal, laser acts on one side, far away from the first brazing filler metal, of the positive electrode lug to heat the positive electrode lug and enable the first brazing filler metal to be melted, and the first brazing filler metal is cooled and solidified to form the first brazing connecting piece, so that connection between the positive electrode lug and the battery protection plate can be achieved without arranging an L-shaped nickel piece, meanwhile, as the first brazing filler metal fills a gap between the positive electrode lug and the first brazing area, the first brazing connecting piece fills the gap between the positive electrode lug and the first brazing area, the problems of cold joint, missing welding and the like can be obviously reduced, and in the traditional laser spot welding process, the L-shaped nickel piece is welded with the positive electrode lug or the battery protection plate through a plurality of laser welding spots, the welding spot area is small, and the brazing process of the embodiment obviously increases the welding area between the first brazing connecting piece and the positive electrode lug and the battery protection plate, namely increases the contact area between the first brazing connecting piece and the positive electrode lug and the battery protection plate and the positive electrode lug, and the current-through capacity between the positive electrode lug and the battery protection plate is further increased; similarly, after the negative electrode lug and the battery protection plate are brazed by adopting the same brazing process, the brazing connection between the negative electrode lug and the battery protection plate can be realized without an L-shaped nickel sheet, and meanwhile, the second brazing connecting piece can fill a gap between the negative electrode lug and a second brazing area, so that the connection strength between the second brazing connecting piece and the negative electrode lug and between the second brazing connecting piece and the battery protection plate is enhanced, and the overcurrent capacity between the negative electrode lug and the battery protection plate is enhanced.
In a second aspect, embodiments of the present application provide a brazing process for a battery, including the steps of:
disposing a positive tab on the battery protection plate such that the positive tab adjoins the first brazing region or the positive tab partially covers the first brazing region, and disposing a negative tab on the battery protection plate such that the negative tab adjoins the second brazing region or partially covers the second brazing region; the first brazing area and the second brazing area are arranged at intervals;
arranging the first brazing filler metal in a region, which is not covered by the positive electrode lug, of the first brazing region, heating the first brazing filler metal to enable the first brazing filler metal to be melted, and cooling and solidifying the first brazing filler metal to enable the first brazing region to be connected with the side wall of the positive electrode lug;
and arranging the second brazing filler metal in an area, which is not covered by the negative electrode lug, of the second brazing filler metal, heating the second brazing filler metal to enable the second brazing filler metal to be melted, and cooling and solidifying the second brazing filler metal to enable the second brazing region to be connected with the side wall of the negative electrode lug.
Based on the above embodiment, the first solder is disposed in the area of the first soldering region not covered by the positive electrode tab, after the first solder is melted, the partially melted first solder will infiltrate between the positive electrode tab and the first soldering region, the remaining melted first solder will be at the junction of the positive electrode tab and the first soldering region, the first solder is cooled and solidified to form the first soldering connecting piece to realize the connection between the positive electrode tab and the first soldering region, the connection strength between the positive electrode tab and the battery protection plate is improved, and the connection strength between the negative electrode tab and the battery protection plate is also improved.
In a third aspect, embodiments of the present application provide a battery, including:
the battery cell comprises positive electrode lugs and negative electrode lugs which are arranged at intervals;
the battery protection plate comprises first brazing areas and second brazing areas which are arranged at intervals;
the positive electrode lug is in braze joint with the first braze joint area through the first braze joint piece; and
and the negative electrode lug is in braze joint with the second braze joint area through the second braze joint piece.
Based on the battery of the embodiment of the application, the battery protection plate is connected with the positive electrode lug of the battery core at the first brazing area through the first brazing connecting piece, and the battery protection plate is connected with the negative electrode lug of the battery core at the second brazing area through the second brazing connecting piece, namely the battery of the embodiment of the application omits an L-shaped nickel sheet, and the material cost of the battery is reduced; in addition, the battery of the embodiment of the application also cancels the procedure of bending the L-shaped nickel sheet, thereby not only reducing the process cost of the battery, but also simplifying the brazing assembly process of the battery.
According to the battery brazing process, after the first brazing filler metal is arranged in the first brazing area and the positive electrode lug is attached to the first brazing filler metal, laser acts on one side, far away from the first brazing filler metal, of the positive electrode lug to heat the positive electrode lug and enable the first brazing filler metal to be melted, and the first brazing filler metal is cooled and solidified to form a first brazing connecting piece, so that connection between the positive electrode lug and the battery protection plate can be achieved without arranging an L-shaped nickel piece, meanwhile, as the first brazing filler metal fills a gap between the positive electrode lug and the first brazing area, the first brazing connecting piece fills the gap between the positive electrode lug and the first brazing area, the problems of cold joint, cold joint and the like can be obviously reduced, and in the traditional laser spot welding process, the L-shaped nickel piece and the positive electrode lug or the battery protection plate are welded through a plurality of laser welding points, and the welding point area is small; similarly, after the negative electrode lug and the battery protection plate are brazed by adopting the same brazing process, the brazing connection between the negative electrode lug and the battery protection plate can be realized without an L-shaped nickel sheet, and meanwhile, the second brazing connecting piece can fill a gap between the negative electrode lug and a second brazing area, so that the connection strength between the second brazing connecting piece and the negative electrode lug and between the second brazing connecting piece and the battery protection plate is enhanced, and the overcurrent capacity between the negative electrode lug and the battery protection plate is enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present application 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 below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a battery according to an embodiment of the present application;
fig. 2 is a schematic structural view of the battery shown in fig. 1 after the battery cell is separated from the battery protection plate;
fig. 3 is a schematic structural view of a battery protection plate in an embodiment of the present application;
FIG. 4 is a process flow diagram of a brazing process for a battery in an embodiment of the present application;
fig. 5 is a process flow diagram of a brazing process for a battery in another embodiment of the present application.
Reference numerals: 10. a battery cell; 11. a positive electrode tab; 12. a negative electrode ear; 20. a battery protection plate; 21. a first braze zone; 22. a second braze zone; 30. a first braze joint; 40. a second braze joint; a. and the length direction of the battery protection plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In the related art, connection between the battery cell and the battery protection plate is mainly achieved by welding an L-shaped nickel sheet attached to the battery protection plate 20 with a tab of the battery cell. The inventors found that: the main problems of the connection method between the battery cell and the battery protection board are that: the cost of L type nickel piece self is higher and processing technology's cost is higher, generally needs to buckle L type nickel piece after L type nickel piece and electric core tab welding, has increased the equipment process, leads to current connected mode cost higher, and in buckling L type nickel piece in-process, has the higher problem of meeting an emergency, has the risk of damaging the components and parts that set up on battery protection board 20.
In order to solve the above-mentioned technical problems, referring to fig. 1, a first aspect of the present application proposes a battery, which can have a lower cost and reduce the risk of assembling the battery.
Referring to fig. 1 to 3, the battery includes a battery cell 10, a battery protection plate 20, a first soldering connecting member 30 and a second soldering connecting member 40, wherein the battery cell 10 includes a positive tab 11 and a negative tab 12 arranged at intervals; the battery protection plate 20 includes a first brazing region 21 and a second brazing region 22 that are disposed at intervals; the positive electrode tab 11 is brazed to the first brazed joint member 30 at the first brazed joint region 21; the negative electrode tab 12 is brazed to the second brazed area 22 via a second braze joint 40.
The battery in the embodiments of the present application may be a storage battery, for example, a lead-acid storage battery, a nickel-based battery, a sodium-sulfur battery, a secondary lithium battery, an air battery, or the like; the present embodiment is not limited to this, and the technical solution in the present embodiment may be adopted to reduce the cost of the battery as long as the battery includes the battery protection plate 20 and the electric core 10 that are connected to each other; the size, use, shape, etc. of the battery are not limited in the embodiments of the present application, and in some embodiments of the present application, the battery may be a mobile phone battery; in other embodiments, the battery may be an electric vehicle battery.
The battery protection board 20 is an integrated circuit board with protection function for rechargeable batteries, and is composed of an electronic circuit, and is used for accurately monitoring the voltage of the battery core 10 and the current of a battery charging and discharging loop at the moment in the environment of-40 ℃ to +85 ℃ and immediately controlling the on-off of the battery current loop. Since the material of the battery itself determines that the battery cell 10 cannot be overcharged, overdischarged, overcurrent, short-circuited, and ultra-high-temperature charged and discharged, the battery cell 10 always follows a battery protection plate 20 formed of a protection plate with a sampling resistor and a current protector.
In some embodiments of the present application, the battery protection plate 20 includes a substrate layer, a circuit layer, and a protection layer, where the substrate layer and the protection layer are disposed on opposite sides of the circuit layer, respectively, and the protection layer has two notches to expose a portion of the circuit layer to form a first soldering region 21 and a second soldering region 22, which are soldered to the positive electrode tab and the negative electrode tab, respectively.
The first soldering region 21 is used for arranging the first soldering connecting piece 30 on the battery protection plate 20, the first solder is coated or attached in the first soldering region 21 (the first solder covers part of the first soldering region 21), and after being melted, the first soldering connecting piece 30 which covers the first soldering region 21 is formed by solidification, the first solder is coated or attached in the first soldering region 21 which is arranged at the position corresponding to the positive electrode lug 11, after the positive electrode lug 11 is aligned with the first soldering region 21, the first solder is positioned between the positive electrode lug 11 and the first soldering region 21, so that the soldering connection between the positive electrode lug 11 and the battery protection plate 20 is facilitated, and the assembly time of the battery can be shortened.
Similarly, the second brazing area 22 is used for arranging the second brazing connector 40 on the battery protection plate 20, the second brazing filler metal is coated or attached in the second brazing area 22 (the second brazing filler metal covers part of the second brazing area 22), and after being melted and solidified to form the second brazing connector 40 covering the second brazing area 22, when the second brazing filler metal is coated or attached in the second brazing area 22 arranged corresponding to the position of the negative electrode tab, the second brazing filler metal is positioned between the negative electrode tab 12 and the second brazing area 22 after the negative electrode tab 12 is aligned with the second brazing area 22, so that the brazing connection between the negative electrode tab 12 and the battery protection plate 20 is facilitated, and the assembly time of the battery can be shortened.
The battery cell 10 is a minimum unit of a power battery, and is also an electric energy storage unit, and is used for storing electric energy, and is generally not directly used, and is used together with the battery protection plate 20 to form a battery, and in the embodiment of the present application, the type, the size, the shape, and the like of the battery cell 10 are not limited, so long as the battery cell 10 can be charged and discharged.
The size, shape, thickness, material and the like of the positive electrode tab 11 and the negative electrode tab 12 are not limited in the embodiment of the present application, and the size, shape and thickness of the positive electrode tab 11 and the negative electrode tab 12 can be set according to the size of the battery, and the material of the positive electrode tab 11 and the negative electrode tab 12, in some embodiments of the present application, the positive electrode tab 11 is an aluminum tab, and the negative electrode tab 12 is a nickel tab or a copper nickel-plated tab.
The first soldering connection member 30 is used for connecting the positive electrode tab 11 of the battery cell 10 and the battery protection plate 20, and in the embodiment of the present application, the size, thickness, material, etc. of the first soldering connection member 30 are not limited; for the size of the first soldering connection member 30, the size of the first soldering region 21 and/or the size of the positive electrode tab 11 may be set to ensure that a sufficient connection area exists between the positive electrode tab 11 of the battery cell 10 and the battery protection plate 20, and further ensure the connection strength between the positive electrode tab 11 and the battery protection plate 20 and the conductivity between the two.
For the material of the first solder, as long as the first solder 30 formed by solidification after the first solder is melted can realize the interconnection of the positive electrode tab 11 and the battery protection plate 20 and can realize the conduction between the two, but in order to reduce the battery cost and improve the welding performance of the positive electrode tab 11 and the battery protection plate 20, in some embodiments of the application, the first solder is zinc alloy solder or tin alloy solder, and the zinc alloy solder and the tin alloy solder have lower price and lower melting point than nickel sheets, so that the cost of the assembly material and the welding energy consumption of the battery are further reduced, and the lower melting point enables the first solder to form the first solder connection 30 more easily, and the connection of the positive electrode tab 11 and the battery protection plate 20 is more convenient to realize.
The second brazing connector 40 is used for connecting the negative electrode tab 12 of the battery cell 10 and the battery protection plate 20, and in the embodiment of the present application, the size, thickness, material, etc. of the second brazing connector 40 are not limited; the second braze joint 40 may be the same size and thickness as the first braze joint 30, and the second braze joint 40 may be of a material that is zinc alloy or tin alloy in some embodiments of the present application, and further in a particular embodiment of the present application, the first braze is zinc alloy and the second braze is tin alloy.
Based on the battery of the embodiment of the application, the battery protection plate 20 is connected with the positive electrode lug 11 of the battery cell 10 in the first soldering area 21 through the first soldering connecting piece 30, and the battery protection plate 20 is connected with the negative electrode lug 12 of the battery cell 10 in the second soldering area 22 through the second soldering connecting piece 40, namely the battery of the embodiment of the application omits an L-shaped nickel sheet, so that the material cost of the battery is reduced; meanwhile, the procedure of bending the L-shaped nickel sheet is not needed, the procedure cost of the battery is reduced, the brazing assembly process of the battery is simplified, and the situation that the battery protection plate 20 is possibly damaged when the L-shaped nickel sheet is bent is avoided, so that the cost, the process difficulty and the risk in the assembly process of the battery are reduced.
In some embodiments of the present application, the length of the first brazing region 21 is equal to or greater than twice the length of the positive electrode tab 11 along the length direction a of the battery protection plate 20; the length of the second soldering region 22 is greater than or equal to twice the length of the negative electrode lug 12, so that the contact area of the positive electrode lug 11 of the battery cell 10 and the first soldering connecting piece 30 is ensured, the contact area of the negative electrode lug 12 of the battery cell 10 and the second soldering connecting piece 40 is ensured, the connection strength between the electrode lug and the battery protection plate 20 is enhanced, and the overcurrent capacity between the electrode lug and the battery protection plate 20 is also improved.
Referring to fig. 4, in a second aspect, an embodiment of the present application provides a brazing process for a battery, including the following steps:
s10, disposing a first solder on a first soldering region 21 on the battery protection plate 20, and disposing a second solder on a second soldering region 22 on the battery protection plate 20 spaced apart from the first soldering region 21;
s20, attaching the positive electrode lug 11 of the battery cell 10 to the first solder, and attaching the negative electrode lug 12 of the battery cell 10 to the second solder;
s30, after the first brazing filler metal is melted by heating the positive electrode lug 11, the first brazing filler metal is cooled and solidified so as to connect the first brazing area 21 with the positive electrode lug 11; and after the second brazing filler metal is melted by heating the negative electrode tab 12, the second brazing filler metal is cooled and solidified to connect the second brazing region 22 with the negative electrode tab 12.
According to the brazing process of the battery in the embodiment of the application, after the first brazing filler metal is arranged in the first brazing area 21 and the positive electrode lug 11 is attached to the first brazing filler metal, laser acts on one side, far away from the first brazing filler metal, of the positive electrode lug 11 to heat the first brazing filler metal to melt the first brazing filler metal, and the first brazing filler metal is cooled and solidified to form the first brazing connector 30, so that connection between the positive electrode lug 11 and the battery protection plate 20 can be achieved without arranging an L-shaped nickel plate, meanwhile, as the first brazing filler metal fills up a gap between the positive electrode lug 11 and the first brazing area 21, the first brazing connector 30 fills up the gap between the positive electrode lug 11 and the first brazing area 21, the problems of cold joint, cold joint and the like can be obviously reduced, and when poor welding such as cold joint or cold joint is caused, the welding can be achieved again through supplementing the brazing filler metal to achieve the welding rework of the battery core 10 and the battery protection plate 20; in the traditional laser spot welding process, the L-shaped nickel sheet is welded with the positive electrode lug 11 or the battery protection plate 20 through a plurality of laser welding spots, the welding spot area is small, and by adopting the brazing process of the embodiment of the application, the welding area between the first brazing connecting piece 30 and the positive electrode lug 11 and the battery protection plate 20 is obviously increased, namely the contact area between the first brazing connecting piece 30 and the positive electrode lug 11 and the battery protection plate 20 is increased, and the connection strength between the first brazing connecting piece 30 and the positive electrode lug 11 and the battery protection plate 20 is further enhanced; similarly, after the negative electrode tab 12 and the battery protection plate 20 are brazed by adopting the same brazing process, the negative electrode tab 12 and the battery protection plate 20 can be brazed without an L-shaped nickel sheet, and meanwhile, the second brazing connector 40 can fill the gap between the negative electrode tab 12 and the second brazing region 22, so that the connection strength between the second brazing connector 40 and the negative electrode tab 12 and the battery protection plate 20 is enhanced.
In some embodiments of the present application, the first brazing connector 30 is formed by melting and then solidifying the first brazing filler metal, the second brazing filler metal connector 40 is formed by melting and then solidifying the second brazing filler metal, the positive electrode tab 11 and the negative electrode tab 12 of the battery cell 10 are aligned and attached to the first brazing filler metal and the second brazing filler metal coated on the battery protection plate 20 respectively, the melted first brazing filler metal and the second brazing filler metal are liquid, the melted first brazing filler metal can fill the gap between the positive electrode tab 11 and the battery protection plate 20 due to fluidity, the melted second brazing filler metal can fill the gap between the negative electrode tab 12 and the battery protection plate 20, after the first brazing filler metal and the second brazing filler metal are solidified, the first brazing filler metal connector 30 fills the gap between the positive electrode tab 11 and the battery protection plate 20, namely, the connection area between the first brazing filler connector 30 and the positive electrode tab 11 and the battery protection plate 20 is increased, and the connection area between the second brazing filler connector 40 and the negative electrode tab 12 and the battery protection plate 20 is increased, and the first brazing filler metal connector 40 and the battery protection plate 20 have sufficient contact strength and contact strength between the positive electrode tab 11 and the second brazing filler metal and the battery protection plate 20.
Further, in some embodiments of the present application, the first solder and the second solder are both paste solder, the paste first solder is coated on the first soldering area 21, and the paste second solder is coated on the second soldering area 22, so that the paste first solder and the paste second solder have small fluidity, after the assembly personnel arrange the first solder and the second solder into the required shapes or thicknesses, the first solder and the second solder keep the prototype unchanged under the condition of no external force, so that the constructors can conveniently arrange and adjust the thicknesses, the shapes and the like of the first solder and the second solder, and the coating thicknesses of the first solder and the second solder are less than or equal to 0.5mm, in some embodiments of the present application, the coating thicknesses of the first solder and the second solder are thinner, and the thicknesses of the first solder and the second solder can be prevented from exceeding a specified value through the thickness of one end of the electrode tab connected with the battery protection plate 20, that is prevented from exceeding the specified value; further, in some embodiments of the present application, the coating thickness of the first solder and the second solder is less than or equal to 0.1mm, in this range, less first solder and second solder can form thinner first solder connection 30 and second solder connection 40, not only can avoid the super thick of the battery head, but also the thinner thickness makes the first solder connection 30 and the second solder connection 40 occupy smaller volume of the battery, which is beneficial to improving the energy density of the battery, and can make the positive electrode tab 11 and the battery protection plate 20 have better overcurrent capability; specifically, in some embodiments of the present application, the thickness of the first solder and the second solder is 0.1mm.
In other embodiments of the present application, the first solder and the second solder are solid solder, the first solder in solid form is attached to the first soldering region 21, the second solder in solid form is attached to the second soldering region 22, the first solder in solid form and the second solder in solid form can be directly attached to the first soldering region 21 and the second soldering region 22 on the battery protection plate 20, respectively, and the assembly efficiency of the battery can be improved.
It is understood that in still other embodiments of the present application, the first braze is a paste braze and the second braze is a solid braze. In still other embodiments of the present application, the first braze is a solid braze and the second braze is a paste braze.
Specifically, when the first solder and/or the second solder are/is solid solder, in some embodiments of the present application, the first solder and the second solder are attached to the battery protection board 20 by using an SMT (Surface Mounted Technology, surface mount technology) patch technology, and SMT patch processing has the advantages of high assembly density, small volume of electronic products, light weight, and the volume and weight of patch elements are only about 1/10 of those of conventional plug-in elements, and generally, after SMT technology is adopted, the volume of electronic products is reduced by 40% -60%, the weight is reduced by 60% -80%, the cost is reduced by 30% -50%, and the electrical device assembled by using SMT patches has high reliability, strong vibration resistance, low defect rate of solder joints, good high frequency characteristics, reduced electromagnetic and radio frequency interference, and easy realization of automation and improved production efficiency.
In some embodiments of the present application, the melting point of the positive tab 11 is higher than that of the first solder, and the melting point of the negative tab 12 is higher than that of the second solder, so that the first solder can be melted by heating the positive tab 11 and the second solder can be melted by heating the negative tab 12 to achieve the brazing connection of the positive tab 11 and the battery protection plate 20, and the brazing connection of the negative tab 12 and the battery protection plate 20.
Further, in some embodiments of the present application, the melting point of the first solder and the melting point of the second solder are both 200 ℃ or higher and 400 ℃ or lower; in this embodiment, the melting point of the aluminum tab is greater than or equal to 680 ℃ and less than or equal to 740 ℃, the melting point of the negative electrode tab 12 is 1400 ℃ and 1050 ℃ respectively, that is, the melting point of the positive electrode tab 11 and the melting point of the negative electrode tab 12 are both far greater than the melting points of the first brazing filler metal and the second brazing filler metal, so that the heating temperature of the brazing process adopted when the positive electrode tab 11 and the battery protection plate 20 are brazed has a larger regulation range, and the heating temperature of the brazing process adopted when the negative electrode tab 12 and the battery protection plate 20 are brazed has a larger regulation range, thereby reducing the brazing process difficulty.
Further, to further reduce the difficulty of the brazing process, in some embodiments of the present application, the melting point of the first brazing filler metal and the melting point of the second brazing filler metal are both 280 ℃ or higher and 400 ℃ or lower or the melting point of the first brazing filler metal and the melting point of the second brazing filler metal are both 250 ℃ or higher and 350 ℃ or lower.
In some embodiments of the present application, the first solder or the second solder is a zinc alloy solder, the zinc alloy solder is a Zn-Al-Cu-Ag alloy, the Zn-Al-Cu-Ag alloy contains 55% to 94.8% Zn, 5% to 44.8% Al, 0.1% to 7.5% Cu, and 0.1% to 7.5% Ag by mass percent; according to the technical scheme, aluminum can refine grains, improve the strength and impact toughness of zinc, obviously lighten the corrosion of molten zinc to iron products so as to ensure the service life of iron electrical elements, silver elements are added into zinc-aluminum solder to improve the microstructure of the solder, the spreadability of the zinc-aluminum solder on lugs is obviously improved, the strength of a soldering head is improved, the corrosion resistance is enhanced, and when the silver element is added to 3.5%, the silver element has better solid solution strengthening effect on the structure and the mechanical property of the solder is optimal; copper element is added into the zinc-aluminum material, the copper element can improve the strength, hardness and corrosion resistance of the zinc alloy, the microstructure of the solder can be improved, the melting temperature of the solder is slightly reduced so as to be convenient for melting the solder, the spreadability on the tab is obviously improved, the strength of a soldering welding head is improved, and the corrosion resistance is enhanced; meanwhile, the spreading area of the brazing filler metal is influenced by the saturation of copper elements in aluminum elements, and when the copper element content is lower than the solubility of the copper elements in the aluminum elements, the spreading area is increased along with the increase of the Cu content; wherein spreadability is the ability of the liquid braze to flow and spread over the surface of the base material.
In other embodiments of the present application, the first solder or the second solder is a tin alloy solder, the tin alloy solder is a Sn-Ag-Ni alloy, and the Sn-Ag-Ni alloy contains 80% to 99.8% of Sn, 0.1% to 10% of Ag, and 0.1% to 10% of Ni by mass. The silver element is added into the tin element, so that the conductivity of the second solder can be enhanced, the electrical property of the battery is improved, meanwhile, the silver element has a good solid solution strengthening effect on a structure, the mechanical property of the solder can be improved, the melting point of the second solder can be greatly reduced by adding nickel into the tin-silver alloy, and specifically, the temperature of the alloy solder is averagely reduced by about 65 ℃ when the content of the nickel element is increased by 5%.
In other embodiments of the present application, the first solder and the second solder may be Zn-Al-Cu-Ag alloy, where the Zn-Al-Cu-Ag alloy contains 55% to 95% Zn, 5% to 45% Al, 0% to 7.5% Cu, and 0% to 7.5% Ag by mass; in still other embodiments of the present application, the first solder and the second solder may each be a Sn-Ag-Ni alloy containing 80% to 99.8% Sn, 0.1% to 10% Ag, and 0.1% to 10% Ni by mass, with the same effects as described above.
In some embodiments of the present application, in the process of brazing the positive electrode tab and the negative electrode tab with the first brazing area and the second brazing area, respectively, the wetting angles between the melted first brazing filler metal and the first brazing area 21 and between the melted second brazing filler metal and the second brazing area 22 and between the melted second brazing filler metal and the negative electrode tab 12 are all less than or equal to 45 °, where the wetting angles refer to the included angles between the liquid-solid interface and the tangent line of the liquid surface at the contact point of the liquid phase and the solid phase, and are divided into the following cases according to the wetting angle, and the wetting angle is 0 °; wetting at 0 ° < wetting angle <90 °;90 ° < wetting angle <180 ° wet pick; θ=180° is completely non-wetting; the smaller wetting angle means that the surface of the material is wet well, so that the wetting angle between the first solder after being melted and the positive electrode lug 11 and the battery protection plate 20 is within a range of less than or equal to 45 degrees, a good brazing effect is ensured between the first solder after being melted and the positive electrode lug 11 and the battery protection plate 20, and in the same way, the wetting angle between the second solder after being melted and the positive electrode lug 11, the negative electrode lug 12 and the battery protection plate 20 is within a range of less than or equal to 45 degrees, and a good brazing effect is ensured between the second solder after being melted and the positive electrode lug 11 and the battery protection plate 20.
Referring to fig. 5, in a third aspect, another soldering process of a battery is provided in the embodiment of the present application, where the melting point of the solder, the material, the wetting angle between the tab and the battery protection plate 20, the thickness of the soldering connection piece, and the like can also be applied to the soldering process of the battery in this embodiment, the soldering process of the battery in the embodiment of the present application includes the following steps:
s40, disposing the positive electrode tab 11 on the battery protection plate 20 so that the positive electrode tab 11 adjoins the first brazing region 21 or so that the positive electrode tab 11 partially covers the first brazing region 21, and disposing the negative electrode tab 12 on the battery protection plate 20 so that the negative electrode tab 12 adjoins the second brazing region 22 or partially covers the second brazing region 22; the first brazing area 21 and the second brazing area 22 are arranged at intervals;
s50, arranging the first brazing filler metal in the area, which is not covered by the positive electrode lug 11, of the first brazing filler metal, heating the first brazing filler metal to melt the first brazing filler metal, and cooling and solidifying the first brazing filler metal to enable the first brazing filler metal 21 to be connected with the side wall of the positive electrode lug 11;
and S60, arranging the second brazing filler metal in the area, which is not covered by the negative electrode lug 12, of the second brazing filler metal, heating the second brazing filler metal to melt the second brazing filler metal, and cooling and solidifying the second brazing filler metal to connect the second brazing filler metal 22 with the side wall of the positive electrode lug 11.
Based on the above embodiment, the first solder is disposed in the area of the first soldering region 21 not covered by the positive electrode tab 11, after the first solder is melted, the partially melted first solder will infiltrate between the positive electrode tab 11 and the first soldering region 21, the remaining melted first solder will be at the junction of the positive electrode tab 11 and the first soldering region 21, the first soldering connecting piece 30 formed after the first solder is cooled and solidified connects the side wall of the positive electrode tab 11 in the first soldering region 21 and the first soldering region 21, and connects the side wall of the positive electrode tab 11 and the side wall of the first soldering region 21 close to each other, so that the connection strength of the positive electrode tab 11 and the battery protection plate 20 is improved, and in the same way, the connection strength of the negative electrode tab 12 and the battery protection plate 20 is also improved, and meanwhile, since the melting point of the positive electrode tab 11 is higher than that of the first solder, the damage to the positive electrode tab 11 when the first solder is heated can be avoided, the reliability of the soldering process is improved, and the soldering connection of the negative electrode tab 12 and the battery protection plate 20 can be realized; in some embodiments of the present application, the steps of S50 and S60 may be interchanged with one another in the order in which they are performed sequentially.
In some embodiments of the present application, the first solder and the second solder are both welding wires, so, the first solder is convenient to fill to the junction of the positive electrode tab 11 and the battery protection plate 20, and the second solder is convenient to fill to the junction of the negative electrode tab 12 and the battery protection plate 20, after the first solder and the second solder are set to welding wires, since the wire feeding speed has an influence on the brazing process, in some embodiments of the present application, the wire feeding speed of the welding wires is greater than or equal to 50mm/s and less than or equal to 500mm/s, in this range, defects such as cold welding and missing welding caused by too slow wire feeding speed can be avoided, and the excessively large volumes of the first brazing connector 30 and the second brazing connector 40 caused by too fast wire feeding speed can be avoided.
In some embodiments of the present application, the speed of brazing the positive electrode tab 11 and the battery protection plate 20, and the negative electrode tab 12 and the battery protection plate 20 is 200mm/s or more and 800mm/s or less, that is, the speed of the first solder moving along the circumferential direction of the positive electrode tab 11 and the speed of the second solder moving along the circumferential direction of the negative electrode tab 12, and the moving speed of the laser spot during laser heating is 200mm/s or more and 800mm/s or less, in which range the laser spot can be ensured to sufficiently heat the welding wire.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, this is for convenience of description and simplification of the description, but does not indicate or imply that the apparatus or element to be referred must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely used for illustration and are not to be construed as limitations of the present patent, and that the specific meaning of the terms described above may be understood by those of ordinary skill in the art according to the specific circumstances.
The foregoing description of the preferred embodiment of the present invention is not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (12)
1. A brazing process of a battery, comprising the steps of:
arranging a first brazing filler metal in a first brazing area on the battery protection plate, and arranging a second brazing filler metal in a second brazing area, which is arranged on the battery protection plate and is spaced from the first brazing area;
attaching the positive electrode lug of the battery cell to the first brazing filler metal, and attaching the negative electrode lug of the battery cell to the second brazing filler metal;
after the first brazing filler metal is melted by heating the positive electrode lug, the first brazing filler metal is cooled and solidified so as to connect the first brazing area with the positive electrode lug; and after the second brazing filler metal is melted by heating the negative electrode lug, the second brazing filler metal is cooled and solidified so as to connect the second brazing area with the negative electrode lug.
2. The brazing process of the battery according to claim 1, wherein the first brazing filler metal and the second brazing filler metal are one of paste brazing filler metal and solid brazing filler metal, and are coated on the first brazing area and the second brazing area when the first brazing filler metal and the second brazing filler metal are both in paste form; and the first brazing filler metal and the second brazing filler metal are respectively attached to the first brazing area and the second brazing area when both are in a solid state.
3. The brazing process of the battery according to claim 1, wherein the positive electrode tab has a melting point higher than that of the first filler metal and the negative electrode tab has a melting point higher than that of the second filler metal.
4. A brazing process for a battery according to claim 3, wherein the melting point of the first brazing filler metal and the melting point of the second brazing filler metal are both 200 ℃ or higher and 400 ℃ or lower.
5. The brazing process for a battery according to claim 4, wherein the melting point of the first filler metal and the melting point of the second filler metal are both 280 ℃ or higher and 400 ℃ or lower or the melting point of the first filler metal and the melting point of the second filler metal are both 250 ℃ or higher and 350 ℃ or lower.
6. The brazing process of the battery according to claim 1, wherein the first brazing filler metal and/or the second brazing filler metal is zinc alloy brazing filler metal or tin alloy brazing filler metal, and/or the positive tab is an aluminum tab, and the negative tab is a nickel tab or a copper nickel-plated tab.
7. The brazing process of the battery according to claim 6, wherein the zinc alloy brazing filler metal is Zn-Al-Cu-Ag alloy, the tin alloy brazing filler metal is Sn-Ag-Ni alloy, and the Zn-Al-Cu-Ag alloy comprises 55 to 94.8 mass percent of Zn, 5 to 44.8 mass percent of Al, 0.1 to 7.5 mass percent of Cu and 0.1 to 7.5 mass percent of Ag; the Sn-Ag-Ni alloy comprises 80 to 99.8 percent of Sn, 0.1 to 10 percent of Ag and 0.1 to 10 percent of Ni in percentage by mass.
8. The brazing process for the battery according to claim 1, wherein the thickness or the coating thickness of each of the first brazing filler metal and the second brazing filler metal is 0.5mm or less.
9. The brazing process for a battery according to claim 8, wherein the thickness or the coating thickness of each of the first brazing filler metal and the second brazing filler metal is 0.1mm or less.
10. The brazing process according to any one of claims 1 to 9, wherein, in the brazing of the positive electrode tab and the negative electrode tab to the first brazing region and the second brazing region, respectively, the wetting angle between the melted first brazing filler metal and the first brazing region and the positive electrode tab is 45 ° or less, and the wetting angle between the melted second brazing filler metal and the second brazing region and the negative electrode tab is 45 ° or less.
11. A brazing process of a battery, comprising the steps of:
disposing a positive tab on the battery protection plate such that the positive tab adjoins the first brazing region or the positive tab partially covers the first brazing region, and disposing a negative tab on the battery protection plate such that the negative tab adjoins the second brazing region or partially covers the second brazing region; the first brazing area and the second brazing area are arranged at intervals;
disposing the first brazing filler metal in a region, which is not covered by the positive electrode lug, of the first brazing region, heating the first brazing filler metal to enable the first brazing filler metal to be melted, and cooling and solidifying the first brazing filler metal to enable the first brazing region to be connected with the positive electrode lug;
and arranging the second brazing filler metal in a region, which is not covered by the negative electrode lug, of the second brazing region, heating the second brazing filler metal to enable the second brazing filler metal to be melted, and cooling and solidifying the second brazing filler metal to enable the second brazing region to be connected with the negative electrode lug.
12. A battery, comprising:
the battery cell comprises positive electrode lugs and negative electrode lugs which are arranged at intervals;
a battery protection plate, wherein a part of the circuit layer of the battery protection plate is exposed to form a first soldering area and a second soldering area which are used for being connected with the positive electrode lug and the negative electrode lug;
the positive electrode lug is in braze joint with the first braze joint area through the first braze joint piece; and
and the negative electrode lug is in braze joint with the second braze joint area through the second braze joint piece.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2022/112181 WO2024031657A1 (en) | 2022-08-12 | 2022-08-12 | Battery, and soldering processes therefor |
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| Publication Number | Publication Date |
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| CN116134656A true CN116134656A (en) | 2023-05-16 |
| CN116134656A8 CN116134656A8 (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202280006024.0A Pending CN116134656A (en) | 2022-08-12 | 2022-08-12 | Battery and brazing process thereof |
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| CN (1) | CN116134656A (en) |
| WO (1) | WO2024031657A1 (en) |
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|---|---|---|---|---|
| CN203839448U (en) * | 2014-02-17 | 2014-09-17 | 惠州亿纬锂能股份有限公司 | Cylindrical battery cell with function of introducing single tab from side surface |
| CN111687525A (en) * | 2020-06-12 | 2020-09-22 | 深圳市拓邦锂电池有限公司 | Method for welding tab of soft package lithium ion battery |
| CN113410584A (en) * | 2021-07-12 | 2021-09-17 | 深圳市神通天下科技有限公司 | Battery with a battery cell |
| CN217114700U (en) * | 2021-12-06 | 2022-08-02 | 深圳市优维尔科技有限公司 | Utmost point ear welded structure and electron atomizing device host computer |
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2022
- 2022-08-12 WO PCT/CN2022/112181 patent/WO2024031657A1/en unknown
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| CI02 | Correction of invention patent application |
Correction item: PCT international application to national stage day Correct: 2023.03.01 False: 2023.02.10 Number: 20-01 Page: The title page Volume: 39 Correction item: PCT international application to national stage day Correct: 2023.03.01 False: 2023.02.10 Number: 20-01 Volume: 39 |
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