CN111031671A - A shell fragment formula contact circuit board for lithium cellization becomes - Google Patents
A shell fragment formula contact circuit board for lithium cellization becomes Download PDFInfo
- Publication number
- CN111031671A CN111031671A CN201911424037.6A CN201911424037A CN111031671A CN 111031671 A CN111031671 A CN 111031671A CN 201911424037 A CN201911424037 A CN 201911424037A CN 111031671 A CN111031671 A CN 111031671A
- Authority
- CN
- China
- Prior art keywords
- circuit board
- contact circuit
- copper
- copper plate
- overvoltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 26
- 239000012634 fragment Substances 0.000 title claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 82
- 229910052802 copper Inorganic materials 0.000 claims abstract description 80
- 239000010949 copper Substances 0.000 claims abstract description 80
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 26
- 229910018104 Ni-P Inorganic materials 0.000 claims abstract description 6
- 229910018536 Ni—P Inorganic materials 0.000 claims abstract description 6
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims abstract description 6
- 238000007747 plating Methods 0.000 claims abstract description 6
- 238000002955 isolation Methods 0.000 claims description 6
- 241000755266 Kathetostoma giganteum Species 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 241000561734 Celosia cristata Species 0.000 claims description 2
- 210000001520 comb Anatomy 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 238000000926 separation method Methods 0.000 abstract description 5
- 238000003801 milling Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 4
- 238000007373 indentation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10189—Non-printed connector
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10409—Screws
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention discloses a spring plate type contact circuit board for lithium battery formation, which comprises a spring plate type contact circuit board main body, wherein the size of the spring plate type contact circuit board main body is 323 x 22 x 7.2mm, the spring plate type contact circuit board main body mainly comprises a base body, an overvoltage copper plate, a separation plate and an overcurrent copper plate, and the overvoltage copper plate, the separation plate and the overcurrent copper plate are sequentially arranged in a groove at the front end of the base body from inside to outside. According to the elastic sheet type contact circuit board for lithium battery formation, the M4 standard nut and the M8 standard nut are embedded in the base body, so that a voltage line and a current line can be conveniently installed; meanwhile, two layers of Ni-P alloy and AU plating layers are arranged on the surfaces of the overvoltage copper plate and the overcurrent copper plate, so that better protection and conductivity can be obtained; and then, by arranging latticed current lines and the elastic sheet + zigzag voltage lines, stable contact is ensured, stable conduction performance is obtained, and the formation process of the lithium battery is optimized.
Description
Technical Field
The invention relates to the field of lithium battery formation, in particular to a spring plate type contact circuit board for lithium battery formation.
Background
In the formation process of the existing lithium battery, the connection process of the battery lug and the circuit board and the firmness of connection with the battery lug greatly influence the product quality and the production efficiency of the battery through the problem analysis of the formation process, the existing formation process of the battery of the equipment has poor contact performance of the circuit board, poor applicability and high reject ratio during formation, and the production efficiency is influenced to a great extent, so that the cost of the product is increased.
Disclosure of Invention
The invention mainly aims to provide a spring plate type contact circuit board for lithium battery formation, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a shell fragment formula contact circuit board for lithium cellization becomes, includes shell fragment formula contact circuit board main part, the size of shell fragment formula contact circuit board main part is 323 22.2 mm, shell fragment formula contact circuit board main part mainly comprises base member, overvoltage copper, division board and overcurrent copper, overvoltage copper and division board and overcurrent copper are installed in the recess of base member front end from inside to outside in proper order.
Preferably, the base body is provided with eight conical countersunk holes of M3 conical-pit flat-head screws, the overvoltage copper plate, the isolation plate and the overcurrent copper plate are respectively provided with eight threaded holes at positions corresponding to the conical countersunk holes on the base body, the back of the base body is provided with 24 blind holes at equal intervals, and the blind holes are 5.5mm in diameter and 1.5mm in depth.
Preferably, the bottom back of base member is seted up an installation groove and No. two installation grooves in addition, the inside embedded mounting of a fixation nut and No. two fixation nuts of installing respectively of No. one installation groove and No. two installation grooves, a fixation nut is M4 standard nut, and No. two fixation nuts are M8 standard nut.
Preferably, the surfaces of the overvoltage copper plate and the overcurrent copper plate are both provided with two layers of plating layers, the first layer is plated with Ni-P alloy and has a thickness of 0.003mm, and the second layer is plated with AU and has a thickness of 0.00005 mm.
Preferably, the surface of the overcurrent copper plate is provided with a milling grid, the milling grid is divided into 1870 grids in total, the distance between each grid is 0.5mm, the length of each grid is 110.5mm, the depth of each grid is 0.25mm, each grid is an electric current line, each grid boss of the milling grid is chamfered by 0.05mm, and the boss protrudes out of the surface of the base body by 0.2 mm.
Preferably, the surface one side of overvoltage copper plate is equipped with the voltage line of shell fragment formula, the surface of voltage line is the cockscomb structure to the length of voltage line is 108.5mm, and the tooth space is 0.5mm, the sawtooth addendum of voltage line is higher than the overcurrent copper plate by 0.5mm, and the sawtooth dedendum of voltage line is the same level as overcurrent copper plate, the interval between overcurrent copper plate and the overvoltage copper plate is 0.6 mm.
Preferably, the base body and the isolation plate are made of glass fiber, and the overvoltage copper plate and the overcurrent copper plate are made of glass copper.
Compared with the prior art, the invention has the following beneficial effects:
according to the elastic sheet type contact circuit board for lithium battery formation, the M4 standard nut and the M8 standard nut are embedded in the base body and are respectively used for fixing the overvoltage copper plate and the overcurrent copper plate, so that the voltage line and the current line can be conveniently installed; meanwhile, two layers of Ni-P alloy and AU plating layers are arranged on the surfaces of the overvoltage copper plate and the overcurrent copper plate, so that better protection and conductivity can be obtained; and then, by arranging latticed current lines and the elastic sheet + zigzag voltage lines, stable contact is ensured, stable conduction performance is obtained, and the formation process of the lithium battery is optimized.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a spring plate type contact circuit board for lithium battery formation according to the present invention;
fig. 2 is an exploded view (front view) of the structure of a spring plate type contact circuit board for lithium battery formation according to the present invention;
fig. 3 is an exploded view (rear view) of a structure of a spring plate type contact circuit board for lithium battery formation according to the present invention;
FIG. 4 is a plan view of a tab type contact circuit board for lithium battery formation in accordance with the present invention;
FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;
FIG. 6 is an enlarged view at B in FIG. 4;
FIG. 7 is a side view of a tabbed contact circuit board for lithium battery formation in accordance with the present invention;
fig. 8 is an enlarged view at C in fig. 7.
In the figure: 1. the elastic sheet type contact circuit board main body; 2. a substrate; 3. an overvoltage copper plate; 4. a separator plate; 5. an overcurrent copper plate; 6. milling grids; 7. a first fixing nut; 8. a second fixing nut; 9. a conical counter bore; 10. a threaded hole; 11. blind holes; 12. a first mounting groove; 13. mounting grooves II; 14. a voltage line; 15. a current line.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-8, a spring contact circuit board for lithium battery formation comprises a spring contact circuit board main body 1, the size of the spring contact circuit board main body 1 is 323 × 22 × 7.2mm, the spring contact circuit board main body 1 mainly comprises a base body 2, an overvoltage copper plate 3, a separation plate 4 and an overcurrent copper plate 5, and the overvoltage copper plate 3, the separation plate 4 and the overcurrent copper plate 5 are sequentially installed in a groove at the front end of the base body 2 from inside to outside;
eight conical countersunk holes 9 of M3 conical-pit flat-head screws are formed in the base body 2, eight threaded holes 10 are respectively formed in the positions, corresponding to the conical countersunk holes 9 in the base body 2, of the overvoltage copper plate 3, the isolation plate 4 and the overcurrent copper plate 5, the back of the base body 2 is further equidistantly provided with 24 blind holes 11, the diameter of each blind hole 11 is 5.5mm, and the depth of each blind hole is 1.5 mm; a first mounting groove 12 and a second mounting groove 13 are additionally formed in the back of the bottom of the base body 2, a first fixing nut 7 and a second fixing nut 8 are respectively embedded in the first mounting groove 12 and the second mounting groove 13, the first fixing nut 7 is an M4 standard nut, and the second fixing nut 8 is an M8 standard nut; the surfaces of the overvoltage copper plate 3 and the overcurrent copper plate 5 are both provided with two layers of plating layers, the first layer is plated with Ni-P alloy with the thickness of 0.003mm, and the second layer is plated with AU with the thickness of 0.00005 mm; the surface of the overcurrent copper plate 5 is provided with a milling grid 6, the milling grid 6 is divided into 1870 grids, the distance between each grid is 0.5mm, the length of each grid is 110.5mm, the depth of each grid is 0.25mm, each grid is a current line 15, each grid boss of the milling grid 6 is chamfered by 0.05mm, and the boss protrudes out of the surface of the substrate 2 by 0.2 mm; a spring piece type voltage wire 14 is arranged on one side of the surface of the overvoltage copper plate 3, the surface of the voltage wire 14 is in a sawtooth shape, the length of the voltage wire 14 is 108.5mm, the tooth space is 0.5mm, the tooth top of the sawtooth of the voltage wire 14 is higher than that of the overcurrent copper plate 5 by 0.5mm, the tooth bottom of the sawtooth of the voltage wire 14 is flush with that of the overcurrent copper plate 5, and the space between the overcurrent copper plate 5 and the overvoltage copper plate 3 is 0.6 mm; the base body 2 and the isolation plate 4 are made of glass fiber, and the overvoltage copper plate 3 and the overcurrent copper plate 5 are made of glass copper.
The invention is a spring plate type contact circuit board for lithium battery formation, wherein a first mounting groove 12 and a second mounting groove 13 are formed in the back of the bottom of a base body 2, an M4 standard nut and an M8 standard nut are respectively embedded and mounted in the first mounting groove 12 and the second mounting groove 13, an overvoltage copper plate 3 and an overcurrent copper plate 5 are respectively fixedly mounted by using the M4 standard nut and the M8 standard nut, and the overvoltage copper plate 3 and the overcurrent copper plate 5 are separated by a separation plate 4, so that the mounting is simplified and the sufficient stability is ensured; meanwhile, the electrical conductivity of the overvoltage copper plate 3 and the overcurrent copper plate 5 is further improved by sequentially plating a 0.003mm Ni-P alloy layer and 0.0000Smm AU on the surfaces of the overvoltage copper plate 3 and the overcurrent copper plate 5; in addition, the grid lug bosses on the surface of the overcurrent copper plate 5 are chamfered by 0.05mm to eliminate burrs and avoid scratching the battery tabs, and then the grid lug bosses are protruded out of the surface of the base body 2 by 0.2mm, so that the copper plate and the body are in poor contact on the same plane; the elastic piece type voltage wire 14 is arranged on one side of the surface of the overvoltage copper plate 3, and the sawtooth is arranged on the surface of the voltage wire 14 and used for puncturing an oxide layer on the surface of a battery tab and better ensuring the stable contact with the tab so as to obtain stable conduction performance; the sawtooth tooth top of the voltage wire 14 is higher than the overcurrent copper plate 5 by 0.5mm, the tooth root is flush with the overcurrent copper plate 5, and the distance between the overcurrent copper plate 5 and the overvoltage copper plate 3 is set to be 0.6mm, so that the indentation generated by the pole lug in the process of pressurizing formation of the battery is effectively eliminated (the former copper plate distance is overlarge, and the pole lug of the battery has large indentation); the copper plate is stably embedded on the body, the battery tabs are reliably contacted with the circuit board, and the battery can be used for charging and discharging batteries with different specifications by changing the thickness of the profile-changing plate.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a shell fragment formula contact circuit board for lithium cellization becomes which characterized in that: including shell fragment formula contact circuit board main part (1), the size of shell fragment formula contact circuit board main part (1) is 323 x 22 x 7.2mm, shell fragment formula contact circuit board main part (1) mainly comprises base member (2), overvoltage copper (3), division board (4) and overcurrent copper (5), install in proper order in the recess of base member (2) front end from inside to outside overvoltage copper (3) and division board (4) and overcurrent copper (5).
2. The flip chip type contact circuit board for lithium battery formation according to claim 1, characterized in that: the base body (2) is provided with eight conical countersunk holes (9) of M3 conical-pit flat-head screws, the overvoltage copper plate (3), the isolation plate (4) and the overcurrent copper plate (5) are respectively provided with eight threaded holes (10) at positions corresponding to the conical countersunk holes (9) on the base body (2), the back surface of the base body (2) is further provided with 24 blind holes (11) at equal intervals, and the blind holes (11) have the diameter of 5.5mm and the depth of 1.5 mm.
3. The flip chip type contact circuit board for lithium battery formation according to claim 1, characterized in that: a mounting groove (12) and a mounting groove (13) No. two have been seted up in addition to the bottom back of base member (2), a fixation nut (7) and a fixation nut (8) No. two are embedded respectively to the inside of a mounting groove (12) and mounting groove (13) No. two, a fixation nut (7) is M4 standard nut, and No. two fixation nut (8) are M8 standard nut.
4. The flip chip type contact circuit board for lithium battery formation according to claim 1, characterized in that: the surfaces of the overvoltage copper plate (3) and the overcurrent copper plate (5) are both provided with two layers of plating layers, the first layer is plated with Ni-P alloy with the thickness of 0.003mm, and the second layer is plated with AU with the thickness of 0.00005 mm.
5. The spring-type contact circuit board for lithium battery formation according to claim 4, characterized in that: the surface of overcurrent copper (5) is equipped with one and mills net (6), mill net (6) and divide into 1870 net altogether, the distance between each net is 0.5mm, and net length is 110.5mm, and the degree of depth is 0.25mm, and every net is current line (15), mill every net boss of net (6) all chamfer 0.05mm to the surface 0.2mm of protrusion base member (2).
6. The flip chip type contact circuit board for lithium battery formation according to claim 5, wherein: the surperficial one side of overvoltage copper board (3) is equipped with spring plate formula voltage line (14), the surface of voltage line (14) is the cockscomb structure to the length of voltage line (14) is 108.5mm, and tooth space 0.5mm, the sawtooth addendum of voltage line (14) is higher than overcurrent copper board (5) by 0.5mm, and the sawtooth dedendum of voltage line (14) and overcurrent copper board (5) parallel and level, the interval between overcurrent copper board (5) and overvoltage copper board (3) is 0.6 mm.
7. The flip chip type contact circuit board for lithium battery formation according to claim 1, characterized in that: the base body (2) and the isolation plate (4) are made of glass fiber, and the overvoltage copper plate (3) and the overcurrent copper plate (5) are made of glass copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911424037.6A CN111031671A (en) | 2019-12-31 | 2019-12-31 | A shell fragment formula contact circuit board for lithium cellization becomes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911424037.6A CN111031671A (en) | 2019-12-31 | 2019-12-31 | A shell fragment formula contact circuit board for lithium cellization becomes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111031671A true CN111031671A (en) | 2020-04-17 |
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ID=70201825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911424037.6A Pending CN111031671A (en) | 2019-12-31 | 2019-12-31 | A shell fragment formula contact circuit board for lithium cellization becomes |
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| Country | Link |
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| CN (1) | CN111031671A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107240719A (en) * | 2017-06-22 | 2017-10-10 | 东莞市盈之宝电子科技有限公司 | A kind of pressure chemical conversion plate and preparation method thereof |
| CN207410586U (en) * | 2017-10-27 | 2018-05-25 | 深圳市云威电路有限公司 | Lithium battery circuit plate |
| CN207427566U (en) * | 2017-11-13 | 2018-05-29 | 深圳市云威电路有限公司 | Circuit board and lithium battery |
| CN209730038U (en) * | 2019-05-17 | 2019-12-03 | 深圳市新浦自动化设备有限公司 | Battery formation tab connects board construction and formation of Li-ion batteries power connection equipment |
| CN110602889A (en) * | 2019-10-21 | 2019-12-20 | 深圳市中基自动化有限公司 | Contact circuit board process for lithium battery formation |
| CN211128417U (en) * | 2019-12-31 | 2020-07-28 | 深圳市中基自动化有限公司 | A shell fragment formula contact circuit board for lithium cellization becomes |
-
2019
- 2019-12-31 CN CN201911424037.6A patent/CN111031671A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107240719A (en) * | 2017-06-22 | 2017-10-10 | 东莞市盈之宝电子科技有限公司 | A kind of pressure chemical conversion plate and preparation method thereof |
| CN207410586U (en) * | 2017-10-27 | 2018-05-25 | 深圳市云威电路有限公司 | Lithium battery circuit plate |
| CN207427566U (en) * | 2017-11-13 | 2018-05-29 | 深圳市云威电路有限公司 | Circuit board and lithium battery |
| CN209730038U (en) * | 2019-05-17 | 2019-12-03 | 深圳市新浦自动化设备有限公司 | Battery formation tab connects board construction and formation of Li-ion batteries power connection equipment |
| CN110602889A (en) * | 2019-10-21 | 2019-12-20 | 深圳市中基自动化有限公司 | Contact circuit board process for lithium battery formation |
| CN211128417U (en) * | 2019-12-31 | 2020-07-28 | 深圳市中基自动化有限公司 | A shell fragment formula contact circuit board for lithium cellization becomes |
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