CN217426951U - Welding-free battery pack - Google Patents
Welding-free battery pack Download PDFInfo
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- CN217426951U CN217426951U CN202221442895.0U CN202221442895U CN217426951U CN 217426951 U CN217426951 U CN 217426951U CN 202221442895 U CN202221442895 U CN 202221442895U CN 217426951 U CN217426951 U CN 217426951U
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Abstract
The utility model relates to a lithium cell field, concretely relates to exempt from to weld battery package, include: the battery pack is arranged between the upper end plate and the lower end plate; the electric core group includes: the battery cell mounting bracket, the battery cell and the PCB confluence plate; the battery cell locking mechanism comprises: the device comprises a metal upper pressing plate, a metal lower pressing plate and a fastening long bolt, wherein the fastening long bolt penetrates through the metal upper pressing plate, the metal lower pressing plate, the upper end plate, the lower end plate and the electric core group. A exempt from to weld battery package, only can accomplish production equipment and disassemble maintenance etc. with the screwdriver, avoided common welding process of lithium cell equipment (laser welding, resistance welding, soldering and ultrasonic welding etc.), brought very big convenience for production and maintenance.
Description
Technical Field
The utility model relates to a lithium cell field, concretely relates to exempt from to weld battery package.
Background
The lithium ion battery generally uses ternary lithium and lithium iron phosphate as positive electrode materials, graphite as negative electrode materials, a diaphragm is adopted to separate the positive electrode and the negative electrode, and an electrolyte is used to conduct lithium ions. The lithium battery cell has various structures such as a cylindrical cell, a square aluminum shell cell, a soft package cell and the like. The cylindrical battery cells are assembled in series and parallel connection to achieve the required voltage and battery capacity. The existing lithium battery cylindrical battery core mainly adopts welding structures such as resistance welding, aluminum wire welding, laser welding and the like, so that the lithium battery is difficult to disassemble and maintain after being molded, and the surface of the battery core can be damaged after the battery core is disassembled and is not beneficial to after-sale maintenance and echelon utilization.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem in the background art, providing a exempt from to weld battery package, only can accomplish the production equipment with the screwdriver and disassemble maintenance etc. have avoided the common welding process of lithium cell equipment, have brought very big convenience for production and maintenance.
The above technical purpose of the present invention can be achieved by the following technical solutions:
a weld-free battery pack, comprising: the battery pack is arranged between the upper end plate and the lower end plate; the electric core group includes: the battery cell mounting bracket, the battery cell and the PCB bus board; the battery cell locking mechanism comprises: the device comprises a metal upper pressing plate, a metal lower pressing plate and a fastening long bolt, wherein the fastening long bolt penetrates through the metal upper pressing plate, the metal lower pressing plate, the upper end plate, the lower end plate and the electric core group.
Preferably, the battery cell mounting bracket comprises a battery cell mounting surface, a PCB mounting surface, a battery cell connecting hole and a locking through hole; the battery cell installation surface is provided with battery cell slots, support columns, clamping hooks and buckles, the clamping hooks and the buckles are the same in number and are arranged oppositely, and battery cell slot clamping walls are arranged around the battery cell slots; the PCB mounting surface is provided with a PCB axial positioning table, dual-function positioning columns and dual-function positioning holes, the dual-function positioning columns and the dual-function positioning holes are the same in number and are arranged in an opposite mode, and edge wrapping strips are arranged on the outline of the PCB mounting surface; the battery cell mounting surface is provided with positioning columns and positioning cylinders, and the positioning columns and the positioning cylinders are same in number and are arranged oppositely.
Preferably, the top of the hook is designed with a guide angle.
Preferably, the guide angle is 20 ° to 45 °.
The top of the clamping hook is provided with a guide angle, so that the clamping hook can automatically deform outwards by directly pressing the upper bracket downwards and is finally clamped in place; a gap is designed between the clamping hook and the clamping buckle, so that after the battery cell surface is attached to the battery cell groove surface on the bracket, the deformation of the clamping hook in the clamping and pressing process can be automatically recovered and clamped in place with the clamping buckle under the elastic force after the deformation is in place. After the module is assembled, the clamping hook buckling structure can grasp the edge of the upper support manually or by a machine in the installation process to carry the whole module, and the next module is stacked without worrying about the scattering of the module in the carrying process.
Preferably, the PCB bus board includes: the battery cell voltage acquisition circuit comprises a substrate and a battery cell connecting reed, wherein the substrate is provided with a reed mounting hole, a plate body positioning hole and a bolt through hole, the battery cell is fastened through external force of a bolt, the bolt through hole is used for penetrating through a fastening bolt, a battery cell connecting circuit and a battery cell voltage acquisition circuit are printed on the substrate, and the battery cell voltage acquisition circuit has the functions of acquiring voltage and maintaining the battery cell; the battery cell connecting reed is installed in the reed mounting hole, the battery cell connecting circuit is connected with the reed mounting hole, two sides of the substrate are abutted to the PCB axial positioning table, and the central plane of the substrate in the thickness direction is aligned to the central plane of the PCB mounting group.
The plate body locating hole is circular locating hole and waist shape locating hole that appears in pairs, it can cooperate the reference column on the electric core support, play good positioning action, and the extending direction in waist shape hole and the line direction coincidence of waist hole and round hole in the design, thereby can allow round hole and waist shape hole still can assemble PCB and electric core support smoothly when having great error in the time of manufacturing, avoid simultaneously because the vacancy is inaccurate to cause PCB board assembly back hunch-up, thereby the PCB that hunches up when whole exempts from to weld the module pressure equipment is crushed or causes whole lithium cell group size grow.
Preferably, the substrate is provided with an extraction electrode, the extraction electrode is connected with the battery core connecting circuit, the extraction electrode comprises a busbar and a pole column, the pole column is in a stud or nut form, and busbar positioning buckles used for being connected with the substrate are arranged on two sides of the busbar. The pole column adopts a form of a stud or a nut column and the like, and can be matched with an OT terminal of the battery pack to be locked by threads, so that manual welding in the assembling process and the maintaining and disassembling process of the battery pack is avoided, and the maintenance and the replacement are simplified; the positioning buckle is matched with the abdicating hole on the PCB to play a role in accurate and reliable positioning.
Preferably, a sampling connector is arranged on the substrate, and the sampling connector is connected with the cell voltage acquisition circuit.
Preferably, a bonding pad is arranged at the reed mounting hole, and the battery cell connecting reed is fixed at the reed mounting hole in a manner of welding with the bonding pad.
Preferably, the battery cell connecting spring plate is integrally formed by punching a metal wafer and comprises: the circular pad and the contact elastic sheet are connected through the stamping section, the stamping section is of a stamping notch structure and comprises a lower concave wall and a stamping platform, two ends of the lower concave wall are respectively connected with the circular pad and the stamping platform, the stamping platform is arranged in parallel with the circular pad, the base part of the contact elastic sheet is connected with the stamping platform, an included angle is formed between the contact elastic sheet and the stamping platform, and the stamping platform is aligned with the central plane in the thickness direction of the substrate.
The arrangement of the concave wall structure is beneficial to putting down and positioning the reeds, and the problem of the placing direction of the reeds does not need to be considered, so that the placing requirement is reduced while certain positioning precision is ensured, and the capacity and large-scale production are favorably improved.
Preferably, the contact elastic sheet is triangular, and the bottom edge of the triangle is connected with the stamping platform.
Preferably, the joint of the contact elastic sheet and the stamping platform is provided with an inverted arch reinforcing rib. The elasticity of the reed can be enhanced, and the reliable contact between the reed and the battery cell is ensured; and meanwhile, when the battery pack is disassembled, the reed can be restored from the deformation state to the original shape, the elasticity is maintained, and the battery pack can be repeatedly used.
Preferably, the top of the contact spring piece is provided with an arc contact. The reed top sets up the circular arc contact to increased with the area of contact of cylinder electricity core, reduced with the contact resistance of electric core, reduced when the battery carries out charge-discharge and generate heat, improved the overcurrent ability of group battery, when the reed compressed simultaneously, the circular arc can smoothly slide on electric core, avoids the card to die, avoids the fish tail to protect the cladding material of electric core surface and reed simultaneously, plays the effect that prevents surface oxidation.
Preferably, the contact elastic sheets are arranged on the circumference and comprise an upwarping group and a downwarping group, and the upwarping group and the contact elastic sheets in the downwarping group are arranged at intervals and are uniformly distributed in the circumferential direction. The contact spring pieces are distributed on the circumference at equal angles, compared with the traditional single spring piece or spring type contact, the contact area is large, the contact is more stable and more balanced, and when the contact is subjected to the pressure of an upper electric core and a lower electric core, the upper and lower force balance reduces the risk that the spring pieces are peeled from the soldering tray.
Preferably, the electric core group comprises: the battery cell installation group and the PCB installation group; the battery cell installation group comprises two battery cell installation supports and the battery cell, the two battery cell installation supports in the battery cell installation group are arranged in a central symmetry mode, battery cell installation surfaces of the two battery cell installation supports are arranged in an opposite direction, the battery cell is installed between the two battery cell installation surfaces, and two ends of the battery cell are clamped in the battery cell slot; the PCB mounting group comprises two battery cell mounting brackets and the PCB confluence plate, the two battery cell mounting brackets in the PCB mounting group are arranged in a central symmetry manner, the PCB mounting surfaces of the two battery cell mounting brackets are oppositely arranged, and the PCB confluence plate is arranged between the two PCB mounting surfaces and is positioned by the dual-function positioning column and the dual-function positioning hole; and the fastening long bolt locks the battery cell installation group and the PCB installation group through the locking through hole.
The two battery cell mounting supports are of the same structure, the lower support is obtained by rotating the upper support by 180 degrees, when the battery cell module is used, a battery cell is inserted into the supports, then the other support which is the same as the battery cell is taken out, and after the other support is positioned by the long positioning cylinder and the long positioning column, the other support is pressed down until the battery cell is completely attached to the ground of the battery cell groove, so that a battery cell module is formed; because two electric core installing support structures are the same, only set one mould has been opened, has reduced the material kind, need not to distinguish when the installation, the production management of being convenient for.
Preferably, the number of the battery cells between two adjacent locking through holes is less than 6.
Preferably, a gap is arranged between the hooks and the buckles of the two battery cell mounting brackets in the battery cell mounting group. The clamping hook buckle connection replaces threaded connection, so that tool-free installation and tool-free disassembly of the battery cell are realized, and convenience is brought to production and after sale. The gap of the buckle structure after final assembly enables the connection of the upper support, the battery cell and the lower support to have no pretightening force, and the welding-free module can be naturally and completely flattened when being compressed, so that the battery cell is completely compressed in the support, if the threaded connection is adopted, the inner surface of the support groove at the edge is tightly pressed with the battery cell at the edge of the module after being locked by the threads, and due to the lever effect, the middle part of the support is easily deformed and arched upwards, so that the battery cell at the middle part can not be compressed, and the contact between the welding-free reed and the battery cell is unreliable; eventually affecting the overall pack internal resistance.
As preferred, electric wire way is provided with to electric core installing support side, electric wire way is provided with long blend stop and short blend stop outward, and when the rotatory installation of electric core installing support, formation dislocation can effectively block the pencil, and the use of bunch ribbon has been avoided in the blend stop design, has simplified the structure, and the cost is reduced has improved production efficiency simultaneously.
Preferably, the battery cell mounting bracket is provided with a sampling interface abdicating groove.
Preferably, the locking through hole penetrates through the positioning column and the positioning cylinder.
Preferably, the thicknesses of the metal upper pressing plate and the metal lower pressing plate are 1.5-3 mm.
Preferably, the metal upper pressure plate is integrated with the upper end plate; the metal lower pressing plate and the lower end plate are integrated into a whole.
To sum up, a exempt from to weld battery package, only can accomplish the production equipment with the screwdriver and disassemble maintenance etc. have avoided common welding process of lithium cell equipment (laser welding, resistance welding, soldering and ultrasonic welding etc.), have brought very big convenience for production and maintenance.
Drawings
Fig. 1 is an assembly schematic diagram of a battery pack according to the present invention;
fig. 2 is a schematic structural view of a cell mounting surface of the present invention;
fig. 3 is a schematic structural view of the PCB mounting surface of the present invention;
fig. 4 is a schematic structural diagram of the battery cell installation set of the present invention;
fig. 5 is a schematic structural diagram of the PCB mounting assembly of the present invention;
fig. 6 is a schematic structural diagram of the PCB bus board of the present invention;
fig. 7 is a schematic structural view of the cell connecting spring of the present invention;
fig. 8 is the utility model discloses the installation sketch map of electric core connection reed and PCB cylinder manifold.
Detailed Description
The following specific embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can modify the present embodiments as required after reading the present specification without any inventive contribution, but only protected by the patent laws within the scope of the appended claims.
The present invention will be described in detail by way of examples with reference to the accompanying drawings.
Example 1:
referring to fig. 1 to 8, a welding-free battery pack includes: the battery pack comprises a battery interface 100, a protective plate 200, an upper end plate 300, a lower end plate 400, a battery core pack 500 and a battery core locking mechanism 600, wherein the battery core pack 500 is arranged between the upper end plate 300 and the lower end plate 400; the electric core pack 500 includes: the battery cell mounting bracket 1, the battery cell 3 and the PCB confluence plate 4; cell locking mechanism 600 includes: metal top board 601, metal holding down plate 602 and fastening long bolt 603, fastening long bolt 603 run through metal top board 601, metal holding down plate 602, up end plate 300, lower end plate 400 and electric core group 500 setting, and metal top board 601 and metal holding down plate 602 thickness are 1.5 ~ 3 mm.
As shown in fig. 2 and 3, the cell mounting bracket 1 includes a cell mounting surface 101, a PCB mounting surface 102, a cell connecting hole 103, and a locking through hole 104; the battery cell mounting surface 101 is provided with battery cell slots 11, support columns 12, hooks 13 and buckles 14, the hooks 13 and the buckles 14 are the same in number and are arranged oppositely, and battery cell slot clamping walls 111 are arranged around the battery cell slots 11; the PCB mounting surface 102 is provided with a PCB axial positioning table 15, dual-function positioning columns 161 and dual-function positioning holes 162, the dual-function positioning columns 161 and the dual-function positioning holes 162 are same in number and are arranged oppositely, and the edge wrapping strips 17 are arranged at the outline of the PCB mounting surface 102; the cell mounting surface 101 is provided with positioning columns 18 and positioning cylinders 19, and the positioning columns 18 and the positioning cylinders 19 are in the same number and are arranged oppositely.
The top of the hook 13 is provided with a guide angle 131, and the angle of the guide angle 131 is 20-45 degrees.
As shown in fig. 5, the PCB bus bar 4 includes: the battery cell voltage acquisition circuit comprises a substrate 41 and a battery cell connecting reed 2, wherein a reed mounting hole 411, a plate body positioning hole 412 and a bolt through hole 413 are formed in the substrate 41, the battery cell is fastened through external force of a bolt, the bolt through hole is used for penetrating through a fastening bolt, and a battery cell connecting circuit 43 and a battery cell voltage acquisition circuit 44 are printed on the substrate 1; the battery cell connecting reed 2 is installed in the reed installing hole 411, the battery cell connecting circuit 43 is connected with the reed installing hole 411, two sides of the substrate 41 are abutted against the PCB axial positioning table 15, and the central plane of the substrate 41 in the thickness direction is aligned with the central plane of the PCB installing group 200.
Be provided with extraction pole 46 on the base plate 41, extraction pole 46 links to each other with electric core connecting circuit 43, and extraction pole 46 includes busbar 461 and utmost point post 462, and utmost point post adopts the double-screw bolt or nut form, and busbar 461 both sides are provided with and are used for being connected with base plate 41 busbar location knot 463 is provided with sampling connector 47 on the base plate 41, and sampling connector 47 links to each other with electric core voltage acquisition circuit 44.
As shown in fig. 8, a bonding pad 45 is disposed at reed mounting hole 411, and cell connecting reed 2 is fixed at reed mounting hole 411 by welding with bonding pad 45.
As shown in fig. 7, the cell connection spring 2 is integrally formed by punching a metal wafer, and includes: circular pad 21 and contact shell fragment 22, circular pad 21 and contact shell fragment 22 link to each other through punching press section 23, punching press section 23 is punching press notch structure, including recessed wall 231 and punching press platform 232 down, recessed wall 231 both ends link to each other with circular pad 21 and punching press platform 232 respectively, punching press platform 232 and circular pad 21 parallel arrangement, contact shell fragment 22 base and punching press platform 232 with link to each other and contact between shell fragment 22 and the punching press platform 232 contained angle setting, punching press platform 232 aligns with the central plane of 41 thickness directions of base plate.
The contact elastic sheet 22 is triangular, the bottom edge of the triangle is connected with the stamping platform 232, the joint of the contact elastic sheet 22 and the stamping platform 232 is provided with the inverted arch reinforcing rib 221, the top of the contact elastic sheet 22 is provided with the arc contact 222, the contact elastic sheet 22 is arranged on the circumference in a plurality of forms, including the upwarp group 24 and the downward turning group 25, the upwarp group 24 and the contact elastic sheet 22 in the downward turning group 25 are arranged at intervals and are uniformly distributed in the circumferential direction.
As shown in fig. 4 and 5, the electric core assembly 500 includes: a cell mounting group 510 and a PCB mounting group 520; the battery cell installation group 510 comprises two battery cell installation supports 1 and a battery cell 3, the two battery cell installation supports 1 in the battery cell installation group 510 are arranged in a central symmetry manner, the battery cell installation surfaces 101 of the two battery cell installation supports are arranged oppositely, the battery cell 3 is installed between the two battery cell installation surfaces 101, and two ends of the battery cell 3 are clamped in the battery cell slot 11; the PCB installation group 520 comprises two battery cell installation supports 1 and a PCB confluence plate 4, the two battery cell installation supports 1 in the PCB installation group 520 are arranged in a central symmetry mode, the PCB installation surfaces 102 of the two battery cell installation supports are arranged oppositely, the PCB confluence plate 4 is arranged between the two PCB installation surfaces 102 and is positioned through the dual-function positioning column 161 and the dual-function positioning hole 162; the long fastening bolt 603 locks the cell mounting group 510 and the PCB mounting group 520 through the locking through hole 104.
The number of the battery cells 3 between two adjacent locking through holes 104 is less than 6, preferably, a gap 1001 is provided between the hook 13 and the buckle 14 of two battery cell mounting brackets 1 in the battery cell mounting group 510, a wire groove 105 is provided on the side surface of the battery cell mounting bracket 1, a long barrier 1051 and a short barrier 1052 are provided outside the wire groove 105, the battery cell mounting bracket 1 is provided with a sampling interface abdicating groove 106, and the locking through holes 104 penetrate through the positioning columns 18 and 19.
Example 2:
the difference from the above embodiment 1 is that the metal upper platen 601 is integrated with the upper platen 300; a metal lower platen 602 is integrated with the lower end plate 400.
Claims (10)
1. A weld-free battery pack, comprising: the battery cell locking device comprises a battery interface (100), a protection plate (200), an upper end plate (300), a lower end plate (400), a cell core group (500) and a cell locking mechanism (600), wherein the cell core group (500) is arranged between the upper end plate (300) and the lower end plate (400);
the electric core group (500) comprises: the battery cell mounting bracket comprises a battery cell mounting bracket (1), a battery cell (3) and a PCB bus board (4);
the cell locking mechanism (600) comprises: metal top board (601), metal holding down plate (602) and fastening long bolt (603), fastening long bolt (603) run through metal top board (601) metal holding down plate (602) upper end plate (300) lower end plate (400) with electric core group (500) set up.
2. The welding-free battery pack according to claim 1, wherein the cell mounting bracket (1) comprises a cell mounting surface (101), a PCB mounting surface (102), a cell connecting hole (103) and a locking through hole (104); the battery cell mounting surface (101) is provided with battery cell slots (11), support columns (12), clamping hooks (13) and buckles (14), the clamping hooks (13) and the buckles (14) are same in number and are arranged oppositely, and battery cell slot clamping walls (111) are arranged around the battery cell slots (11); the PCB mounting surface (102) is provided with a PCB axial positioning table (15), dual-function positioning columns (161) and dual-function positioning holes (162), the dual-function positioning columns (161) and the dual-function positioning holes (162) are same in number and are arranged oppositely, and an edge wrapping strip (17) is arranged at the outline of the PCB mounting surface (102); the battery cell mounting surface (101) is provided with positioning columns (18) and positioning cylinders (19), and the positioning columns (18) and the positioning cylinders (19) are the same in number and are arranged oppositely.
3. The soldering-free battery pack according to claim 1, wherein the PCB bus bar (4) comprises: the battery cell voltage acquisition circuit comprises a substrate (41) and a battery cell connecting reed (2), wherein a reed mounting hole (411), a plate body positioning hole (412) and a bolt through hole (413) are formed in the substrate (41), and a battery cell connecting circuit (43) and a battery cell voltage acquisition circuit (44) are printed on the substrate (1); the battery cell connecting reed (2) is installed in the reed installing hole (411), the battery cell connecting circuit (43) is connected with the reed installing hole (411), two sides of the base plate (41) are abutted to the PCB axial positioning table (15), and the central plane of the thickness direction of the base plate (41) is aligned to the central plane of the PCB installing group (200).
4. The welding-free battery pack as recited in claim 3, wherein a bonding pad (45) is disposed at the spring mounting hole (411), and the cell connecting spring (2) is fixed at the spring mounting hole (411) by welding with the bonding pad (45).
5. The welding-free battery pack as claimed in claim 4, wherein the cell connecting spring (2) is integrally punched from a metal disc and comprises: circular pad (21) and contact shell fragment (22), circular pad (21) with contact shell fragment (22) link to each other through punching press section (23), punching press section (23) are punching press notch structure, including concave wall (231) and stamping platform (232) down, concave wall (231) both ends down respectively with circular pad (21) with stamping platform (232) link to each other, stamping platform (232) with circular pad (21) parallel arrangement, contact shell fragment (22) base with stamping platform (232) with link to each other just contact shell fragment (22) with contained angle setting between stamping platform (232), stamping platform (232) with the central plane of base plate (41) thickness direction aligns.
6. The welding-free battery pack as recited in claim 2, wherein the battery pack (500) comprises: a battery cell installation group (510) and a PCB installation group (520); the battery cell installation group (510) comprises two battery cell installation supports (1) and a battery cell (3), the two battery cell installation supports (1) in the battery cell installation group (510) are arranged in a central symmetry mode, battery cell installation surfaces (101) of the two battery cell installation supports are arranged in opposite directions, the battery cell (3) is installed between the two battery cell installation surfaces (101), and two ends of the battery cell (3) are clamped in the battery cell slot (11); the PCB mounting group (520) comprises two battery cell mounting brackets (1) and a PCB junction plate (4), the two battery cell mounting brackets (1) in the PCB mounting group (520) are arranged in a central symmetry manner, the PCB mounting surfaces (102) of the two battery cell mounting brackets are arranged oppositely, and the PCB junction plate (4) is arranged between the two PCB mounting surfaces (102) and is positioned through the dual-function positioning column (161) and the dual-function positioning hole (162); the fastening long bolt (603) locks the battery cell installation group (510) and the PCB installation group (520) through the locking through hole (104).
7. The welding-free battery pack as claimed in claim 6, wherein a gap (1001) is provided between the hooks (13) and the buckles (14) of the two cell mounting brackets (1) in the cell mounting group (510).
8. The welding-free battery pack as claimed in claim 1, wherein a wire groove (105) is formed in a side surface of the cell mounting bracket (1), and a long barrier strip (1051) and a short barrier strip (1052) are arranged outside the wire groove (105).
9. The welding-free battery pack as recited in claim 1, wherein the thickness of the upper metal pressing plate (601) and the lower metal pressing plate (602) is 1.5-3 mm.
10. The welding-free battery pack according to claim 1, wherein the metal upper pressure plate (601) is integrated with the upper end plate (300); the metal lower pressure plate (602) is integrated with the lower end plate (400).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221442895.0U CN217426951U (en) | 2022-06-08 | 2022-06-08 | Welding-free battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221442895.0U CN217426951U (en) | 2022-06-08 | 2022-06-08 | Welding-free battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217426951U true CN217426951U (en) | 2022-09-13 |
Family
ID=83170590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221442895.0U Active CN217426951U (en) | 2022-06-08 | 2022-06-08 | Welding-free battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217426951U (en) |
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2022
- 2022-06-08 CN CN202221442895.0U patent/CN217426951U/en active Active
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