Method and jig for spot welding lithium-ion batteries

Abstract

The present application relates to the field of lithium ion battery manufacturing, and discloses a method and jig for positioning welding of a lithium ion battery. A welding positioning groove, positioning holes and a circuit board positioning table are arranged on the top surface of the jig frame. The positioning holes are arranged in a row on one side of the welding positioning groove, each positioning hole is provided with a first notch, and the circuit board positioning table is located on the other side of the welding positioning groove. A separate positioning block is also provided, a recess is arranged on the top of the positioning block, a second notch is arranged on the recess, and a welding pad strip is also provided. The welding pad strip is embedded in the welding positioning groove. When welding, each lithium ion battery is limited in the recess of each positioning block, each positioning block is limited in each positioning hole, each second notch is opposite to the first notch, and the two electrodes of each lithium ion battery extend from the first notch and the second notch, and are opposite and stacked on the top surface of the welding pad strip with the two electrodes of the circuit board on the circuit board positioning table, so as to realize the welding connection of the lithium ion battery and the circuit board.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery manufacturing, and in particular to a method and fixture for positioning and welding lithium-ion batteries. Background Technology

[0002] With the expansion of the new energy market, the application of smart wearables and digital products is becoming more and more widespread, leading to a growing demand for lithium-ion batteries. At the same time, the requirements for battery size and tolerance are becoming increasingly stringent, and the labor costs for lithium battery PACK production are gradually increasing. Summary of the Invention

[0003] One of the objectives of this invention is to provide a method and fixture for positioning and welding lithium-ion batteries. Applying this technical solution can improve the convenience and reliability of positioning and welding lithium-ion batteries.

[0004] In a first aspect, the present invention provides a method for positioning and welding a lithium-ion battery, which employs a combined fixture. The combined fixture includes a fixture frame (1) and a plurality of positioning blocks (6). The top surface of the fixture frame (1) is provided with a welding positioning groove (2), a plurality of positioning holes (3) arranged in a row, and a plurality of circuit board positioning platforms (4) arranged in a row. The welding positioning groove (2) is an elongated groove, and the plurality of positioning holes (3) are arranged in a row on one side of the welding positioning groove (2). Each positioning hole (3) A first notch (31) communicating with the welding positioning groove (2) is provided on one side facing the welding positioning groove (2). Each circuit board positioning platform (4) is arranged opposite to the positioning hole (3) on the side of the welding positioning groove (2) away from the positioning hole (3). Each circuit board positioning platform (4) is arranged in a row along the length direction of the welding positioning groove (2), and each circuit board positioning platform (4) corresponds to one positioning hole (3). A welding pad is also provided, which is embedded in the welding positioning groove. Each of the positioning blocks (6) has a recess (61) on its top, and a second notch (62) is provided on the recess (61). Each of the positioning blocks (6) is detachably placed in each of the positioning holes (3). The fixture is equipped with a plurality of sets of the positioning blocks (6). The recesses (61) of different sets of the positioning blocks (6) are adapted to lithium-ion batteries of different specifications. The method includes: According to the specifications of the lithium-ion battery to be welded, a set of positioning blocks (6) with the shape of the recess (61) is selected to match it. Each selected positioning block (6) is placed into each of the positioning holes (3), and the second notch (62) on each positioning block (6) is directly opposite to the first notch (31) of the positioning hole (3) where the positioning block (6) is located. The second notch (62) faces the welding positioning groove (2) and is connected to the welding positioning groove (2). Each of the lithium-ion batteries is placed into the recess (61) of each of the positioning blocks (6), and the two tabs of each lithium-ion battery extend out from each of the second notches (62) and lie flat on the top surface of the welding pad (5). Each of the circuit boards is placed on the circuit board positioning platform (4) of the fixture, and the two electrodes of each circuit board are respectively stacked on the top surface of the welding pad (5) with the end sections of the two tabs of each lithium-ion battery. The fixture is fixed to the welding table of the welding equipment, and the tabs and electrodes stacked on the top surface of the welding pad (5) are welded together to obtain the lithium-ion battery assembly.

[0005] Optionally, the fixture may further include a base (7). Each of the positioning blocks (6) has a horizontal protrusion (63) that protrudes outward at the bottom. Each lithium-ion battery is placed into the recess of each positioning block (6), including: Each of the positioning blocks (6) is pushed from the bottom of each of the positioning holes (3) upwards, and the base (7) is fastened to the bottom surface of the fixture frame (1). The horizontal protrusion (63) of each of the positioning blocks (6) is located outside the positioning hole (3) and is attached to the bottom surface of the fixture frame (1), and is fastened between the bottom surface of the fixture frame (1) and the base (7).

[0006] Optionally, a through hole (64) is provided in the recess of each of the positioning blocks (6) to extend vertically. After welding, when removing the lithium-ion battery from the welded circuit board, the lithium-ion battery, which is confined within the positioning block (6), is pushed upward from the through hole (64) exposed at the bottom of the fixture.

[0007] Optionally, fixture positioning parts (9) are provided on the two opposite edges of the fixture frame.

[0008] Optionally, at least one protrusion (51) is provided on the top of each of the welding pads (5).

[0009] Secondly, an embodiment of the present invention provides a fixture for positioning and welding lithium-ion batteries, comprising: The jig frame (1) has a welding positioning groove (2), a plurality of positioning holes (3) arranged in rows, and a plurality of circuit board positioning platforms (4) arranged in rows on its top surface. The welding positioning groove (2) is a long groove. Each of the positioning holes (3) has a first notch (31) communicating with the welding positioning groove (2) on the side facing the welding positioning groove (2). Each of the circuit board positioning platforms (4) is disposed opposite to the positioning holes (3) on the side of the welding positioning groove (2) away from the positioning holes (3). Each of the circuit board positioning platforms (4) is arranged in a row along the length direction of the welding positioning groove (2), and each circuit board positioning platform (4) corresponds to one positioning hole (3). Multiple sets of positioning blocks (6), the recesses (61) of different sets of positioning blocks (6) are adapted to lithium-ion batteries of different specifications; each positioning block (6) has a recess (61) on its top, and a second notch (62) is provided on the recess (61); each positioning block (6) is detachably placed in each positioning hole (3), and the second notch (62) on each positioning block (6) is directly opposite to the first notch (31) of the positioning hole (3) where the positioning block (6) is located; Welding spacer (5), the welding spacer (5) is embedded in the welding positioning groove (2), During welding, each of the selected positioning blocks (6) is placed into the corresponding positioning hole (3), and each lithium-ion battery is confined within the recess (61) of each selected positioning block (6). The two tabs of each lithium-ion battery extend from each of the second notches (62) and are stacked on the top surface of the welding pad (5) opposite to the two electrodes of the circuit board located on the circuit board positioning platform (4), so as to realize the welding connection between the lithium-ion battery and the circuit board on the welding pad (5).

[0010] Optionally, a protrusion (51) is also provided on the top of each of the welding pads (5).

[0011] Optionally, the height of each of the protrusions (51) exceeds the height of the circuit board positioning platform (4). When soldering, the circuit board is limited outside the protrusions (51) and is prohibited from moving toward the lithium-ion battery.

[0012] Optionally, it also includes: a base (7). Each of the positioning blocks (6) has a horizontally protruding protrusion (63) at its bottom. When each of the positioning blocks (6) is located within the positioning hole (3), the horizontal protrusion (63) of each of the positioning blocks (6) is located outside the positioning hole (3) and is in contact with the bottom surface of the fixture frame (1). The base (7) is fastened to the bottom surface of the fixture frame (1), and the horizontal protrusions (63) of each positioning block (6) are fastened between the bottom surface of the fixture frame (1) and the base (7).

[0013] Optionally, hand-held portions (8) are provided at both opposite ends of the fixture frame (1).

[0014] Optionally, fixture positioning parts (9) are provided on the two opposite edges of the fixture frame (1).

[0015] Optionally, the fixture positioning portions (9) located on the two opposite edges of the fixture frame (1) are staggered.

[0016] Optionally, each of the fixture positioning parts (9) is either an inwardly recessed part (61) or an outwardly protruding part.

[0017] Optionally, a through hole (64) is provided in the recess (61) of each of the positioning blocks (6) through the top and bottom.

[0018] Optionally, the through hole (64) is located at the center of the recess (61).

[0019] As can be seen from the above, the combined fixture of this embodiment is particularly suitable for the positioning and welding of small-sized lithium-ion batteries. The combined positioning fixture can fix the lithium-ion batteries with positioning blocks and position the circuit boards with circuit board positioning tables. By welding the tabs of each lithium-ion battery and the electrodes of its corresponding circuit boards to the welding pads fixed between them, the welding position of each lithium-ion battery and the circuit board is consistent, thus ensuring the dimensional consistency of the batch of lithium-ion battery assemblies.

[0020] The positioning blocks can be disassembled and replaced at any time according to the shape of the current lithium-ion battery, making the fixture highly versatile. Attached Figure Description

[0021] The accompanying drawings, which are provided to further illustrate the invention and form part of this application, do not constitute an undue limitation of the invention.

[0022] Figure 1 This is a schematic diagram of a fixture structure for positioning and welding lithium-ion batteries, provided for a specific embodiment of the present invention.

[0023] 1: Fixture frame; 2: Welding positioning groove; 3: Positioning hole; 31: First notch; 4: Circuit board positioning platform; 5: Soldering pad; 51: Protrusion; 6: Positioning block; 61: Recess; 62: Second notch; 63: Horizontal protrusion; 64: Through hole; 7: Base; 8: Hand-held part; 9: Fixture positioning part. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0025] See Figure 1 .

[0026] This embodiment provides a fixture for positioning welding of lithium-ion batteries. Its main body is a fixture frame 1, and a welding positioning groove 2, a positioning hole 3, and a circuit board positioning platform 4 are provided on the top surface of the fixture frame 1.

[0027] Among them, the welding positioning groove 2 is a long groove, and the width of the welding positioning groove 2 is set to the length of the welding section where the electrode tab of the lithium-ion battery and the electrode of the external circuit board are stacked and welded.

[0028] Each welding positioning groove 2 is provided with a welding pad 5 made of high temperature resistant insulating material. The welding pad 5 can be set as an independent structure, which can be placed in the welding positioning groove 2 for welding during application to avoid damage to the fixture by high welding temperature. When not needed or damaged and needing replacement, it can be removed from the welding positioning groove 2 for easy maintenance and replacement.

[0029] Positioning holes 3 are set on one side of welding positioning groove 2. For convenience, a welding positioning groove 2 is used as an example. Positioning holes 3 corresponding to the welding positioning groove 2 are set at the front end of the welding positioning groove 2. There are at least two positioning holes 3. Each positioning hole 3 is arranged in a row along the length direction of the welding positioning groove 2. A notch is also provided on the side of each positioning hole 3 facing the long groove, which is called the first notch 31. Each first notch 31 is connected to the welding positioning groove 2 directly opposite it.

[0030] The circuit board positioning platform 4 and the positioning hole 3 are respectively set at the rear end of the welding positioning groove 2. Each welding positioning groove 2 is arranged in a row along the length direction of the welding positioning groove 2. Each circuit board positioning platform 4 corresponds to a positioning hole 3. The number of circuit board positioning platforms 4 is the same as the number of positioning holes 3.

[0031] The fixture in this embodiment is also equipped with a plurality of positioning blocks 6. The external dimensions of each positioning block 6 are adapted to the dimensions of the recesses 61 of each positioning hole 3 on the fixture, so that each positioning block 6 can be confined within its respective positioning hole 3 and is prohibited from displacement. A recess 61 is provided on the top of each positioning block 6. The shape of the recess 61 is set according to the shape of the lithium-ion battery. A notch is provided on the recess 61, which is referred to as the second notch 62.

[0032] In application, several specifications of recesses 61 can be preset according to the specifications of several commonly used lithium-ion batteries, that is, multiple sets of positioning blocks 6 can be preset. So that when applying, a matching set of positioning blocks 6 can be selected according to the current lithium-ion battery specifications.

[0033] During welding, each positioning block 6 is placed into each positioning hole 3 of the fixture, so that the position of the second notch 62 on each positioning block 6 is consistent with the position of the first notch 31 in the positioning hole 3; each lithium-ion battery is placed into the recess 61 of each positioning block 6, with the two electrodes of the lithium-ion battery protruding from the second notch 62 and lying flat on the top surface of the welding pad 5. Each circuit board is placed on its respective circuit board positioning platform 4, so that the two protruding electrodes of each circuit board also lie flat on the welding pad 5, and the two electrodes and the ends of the two electrodes are stacked opposite each other (positive electrode stacked with positive electrode, negative electrode stacked with negative electrode) on the top surface of the welding pad 5. Then, welding equipment is used to weld each lithium-ion battery and the circuit board corresponding to the lithium-ion battery together.

[0034] As can be seen from the above, the combined fixture of this embodiment is particularly suitable for the positioning and welding of small-sized lithium-ion batteries. The combined positioning fixture can fix the lithium-ion batteries with positioning blocks 6 and position the circuit boards with circuit board positioning platforms 4. By welding the tabs of each lithium-ion battery and the electrodes of their corresponding circuit boards to the positioning of the welding pads 5 fixed between them, the welding position of each lithium-ion battery and the circuit board is consistent, thus ensuring the dimensional consistency of the batch of lithium-ion battery assemblies.

[0035] The positioning block 6 can be disassembled and replaced at any time according to the shape of the current lithium-ion battery, making the fixture highly versatile.

[0036] As an illustration of this embodiment, the welding pad 5 may be made of ceramic strip, but is not limited to, to increase the hardness of the welding pad 5, extend its life, and improve welding reliability. Furthermore, the use of independent welding pads in this embodiment helps reduce the material requirements of the fixture frame 1, saving material costs.

[0037] As an illustration of this embodiment, the length of each welding pad 5 can be, but is not limited to, depending on the welding equipment. For example, there can be one welding pad 5 for each lithium-ion battery, or two, three or more. Multiple welding pads 5 can be spliced ​​together along the length direction in a welding positioning groove 2.

[0038] As an illustration of this embodiment, each welding pad 5 in this embodiment is further provided with at least one protrusion 51 on its top. When the welding pad 5 is placed into the welding positioning groove 2, each protrusion 51 is directly opposite to the first notch 31 on the positioning hole 3. During welding, a protrusion 51 (the protrusion 51 on the welding pad 5) is spaced apart between the two tabs of the lithium-ion battery located in each positioning block 6 of each positioning hole 3, thereby preventing the two tabs from short-circuiting. In addition, but not limited to, the height of the protrusion 51 on the welding pad 5 can be further set to be higher than the height of the circuit board positioning platform 4, which serves as the circuit board placement platform, to ensure that the protrusion 51 separates the circuit board from the outside, preventing the circuit board from moving towards the lithium-ion battery, further improving the reliability of welding positioning and welding reliability.

[0039] As an illustration of this embodiment, the fixture further includes a base 7. Accordingly, each positioning block 6 can be designed with a horizontal protrusion 63 protruding outward 51 at the bottom outer edge of the positioning block 6. The horizontal protrusion 63 can be, but is not limited to, symmetrically surrounding the outer edge of the positioning block 6, or can be, but is not limited to, continuously surrounding the outer edge of the positioning block 6. In this way, during assembly, each positioning block 6 can be pushed into the positioning hole 3 from bottom to top by the bottom of the fixture frame 1. The horizontal protrusion 63 at the bottom of each positioning block 6 is located outside the positioning hole 3 and close to the bottom surface of the fixture frame 1. After all the positioning blocks 6 are placed into the positioning holes 3, the base 7 is locked to the bottom surface of the fixture frame 1, and the horizontal protrusions 63 of all the positioning blocks 6 are locked between the base 7 and the bottom surface of the fixture frame 1, thus preventing the positioning blocks 6 from shifting. This technical solution is beneficial to further improve the positioning reliability and positioning accuracy of each positioning block 6.

[0040] As an illustration of this embodiment, a hand-held part 8 may be provided at each of the left and right ends of the jig frame 1, and a narrow hole may be formed at each of the left and right ends of the jig frame 1 near the edge. In this way, the user can easily move the jig or jig frame 1 through the left and right opposite hand-held parts 8.

[0041] As an illustration of this embodiment, fixture positioning parts 9 are respectively provided on the outer edge of the fixture frame 1 (such as, but not limited to, the front edge and the rear edge). In this way, when performing automated welding with welding equipment, such as, but not limited to, using laser welding equipment, the fixture with the pre-assembled lithium-ion battery and circuit board is fixed on the welding platform of the welding equipment, so that the positioning parts at the front and rear ends of the welding platform are engaged with the fixture positioning parts 9 at the front and rear ends of the fixture (for example, one of the positioning parts on the welding platform and the fixture is convex, and the other is a matching recess 61, so that the positioning parts on the welding platform and the fixture are engaged with each other), ensuring the positioning of the fixture on the welding equipment and ensuring the accuracy of welding positioning.

[0042] In addition, but not limited to, the positioning parts on the front and rear edges of the fixture can be staggered. For example, two positioning parts can be set on the rear edge of the fixture, and one positioning part can be set on the front edge, with the front positioning part located between the two rear positioning parts.

[0043] As an illustration of this embodiment, through holes 64 can also be provided on each positioning block 6, but not limited to the vertical through holes 64. The through holes 64 are located in the recesses 61 on their top surfaces. In this way, when it is necessary to remove the lithium-ion battery from the positioning block 6, it can be lifted up from the hole at the bottom without clamping or pulling the tabs, which improves the convenience of disassembly.

[0044] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A method of tack welding a lithium-ion battery, characterized by, A combined fixture is adopted, which includes a fixture frame (1) and a plurality of positioning blocks (6). The top surface of the fixture frame (1) is provided with a welding positioning groove (2), a plurality of positioning holes (3) arranged in a row, and a plurality of circuit board positioning platforms (4) arranged in a row. The welding positioning groove (2) is a long groove. The plurality of positioning holes (3) are arranged in a row on one side of the welding positioning groove (2). Each positioning hole (3) has a first notch (31) communicating with the welding positioning groove (2) on the side facing the welding positioning groove (2). Each circuit board positioning platform (4) is arranged opposite to the positioning hole (3) on the side of the welding positioning groove (2) away from the positioning hole (3). Each circuit board positioning platform (4) is arranged in a row along the length direction of the welding positioning groove (2), and each circuit board positioning platform (4) corresponds to one positioning hole (3). A welding pad is also provided, which is embedded in the welding positioning groove. The positioning blocks (6) are arranged in a plurality of sets. The recesses (61) of the positioning blocks (6) in different sets are adapted to lithium-ion batteries of different specifications. The top of each positioning block (6) is provided with the recess (61), and a second notch (62) is provided on the recess (61). Each positioning block (6) is detachably placed in each positioning hole (3). The method includes: According to the specifications of the lithium-ion battery to be welded, a set of positioning blocks (6) with the shape of the recess (61) is selected to match it. Each selected positioning block (6) is placed into each of the positioning holes (3), and the second notch (62) on each positioning block (6) is directly opposite to the first notch (31) of the positioning hole (3) where the positioning block (6) is located. The second notch (62) faces the welding positioning groove (2) and is connected to the welding positioning groove (2). Each of the lithium-ion batteries is placed into the recess (61) of each of the positioning blocks (6), and the two tabs of each lithium-ion battery extend out from each of the second notches (62) and lie flat on the top surface of the welding pad (5). Each of the circuit boards is placed on the circuit board positioning platform (4) of the fixture, and the two electrodes of each circuit board are respectively stacked on the top surface of the welding pad (5) with the end sections of the two tabs of each lithium-ion battery. The fixture is fixed to the welding table of the welding equipment, and the tabs and electrodes stacked on the top surface of the welding pad (5) are welded together to obtain the lithium-ion battery assembly.

2. The method for positioning and welding a lithium-ion battery according to claim 1, characterized in that, The fixture also includes a base (7). Each of the positioning blocks (6) has a horizontal protrusion (63) that protrudes outward at the bottom. Each lithium-ion battery is placed into the recess of each positioning block (6), including: Each of the positioning blocks (6) is pushed from the bottom of each of the positioning holes (3) upwards, and the base (7) is fastened to the bottom surface of the fixture frame (1). The horizontal protrusion (63) of each of the positioning blocks (6) is located outside the positioning hole (3) and is attached to the bottom surface of the fixture frame (1), and is fastened between the bottom surface of the fixture frame (1) and the base (7).

3. The method for positioning and welding lithium-ion batteries according to claim 1, characterized in that, Each of the positioning blocks (6) is provided with a through hole (64) that extends vertically through the recess. After welding, when removing the lithium-ion battery from the welded circuit board, the lithium-ion battery, which is confined within the positioning block (6), is pushed upward from the through hole (64) exposed at the bottom of the fixture.

4. The method for positioning and welding lithium-ion batteries according to claim 1, characterized in that, Fixture positioning parts (9) are respectively provided on the two opposite edges of the fixture frame (1).

5. The method for positioning and welding lithium-ion batteries according to claim 1, characterized in that, At least one protrusion (51) is provided on the top of each of the welding pads (5).

6. A fixture for positioning welding of lithium-ion batteries, characterized in that, include: The jig frame (1) has a welding positioning groove (2), a plurality of positioning holes (3) arranged in rows, and a plurality of circuit board positioning platforms (4) arranged in rows on its top surface. The welding positioning groove (2) is a long groove. Each of the positioning holes (3) has a first notch (31) communicating with the welding positioning groove (2) on the side facing the welding positioning groove (2). Each of the circuit board positioning platforms (4) is disposed opposite to the positioning holes (3) on the side of the welding positioning groove (2) away from the positioning holes (3). Each of the circuit board positioning platforms (4) is arranged in a row along the length direction of the welding positioning groove (2), and each circuit board positioning platform (4) corresponds to one positioning hole (3). Multiple sets of positioning blocks (6), the recesses (61) of different sets of positioning blocks (6) are adapted to lithium-ion batteries of different specifications; each positioning block (6) has a recess (61) on its top, and a second notch (62) is provided on the recess (61); each positioning block (6) is detachably placed in each positioning hole (3), and the second notch (62) on each positioning block (6) is directly opposite to the first notch (31) of the positioning hole (3) where the positioning block (6) is located; Welding spacer (5), the welding spacer (5) is embedded in the welding positioning groove (2), During welding, each of the selected positioning blocks (6) is placed into the corresponding positioning hole (3), and each lithium-ion battery is confined within the recess (61) of each selected positioning block (6). The two tabs of each lithium-ion battery extend from each of the second notches (62) and are stacked on the top surface of the welding pad (5) opposite to the two electrodes of the circuit board located on the circuit board positioning platform (4), so as to realize the welding connection between the lithium-ion battery and the circuit board on the welding pad (5).

7. The fixture for positioning and welding lithium-ion batteries according to claim 6, characterized in that, A protrusion (51) is also provided on the top of each of the welding pads (5).

8. The fixture for positioning and welding lithium-ion batteries according to claim 7, characterized in that, The height of each of the protrusions (51) exceeds the height of the circuit board positioning platform (4). When soldering, the circuit board is limited outside the protrusions (51) and is prohibited from moving toward the lithium-ion battery.

9. The fixture for positioning welding of lithium-ion batteries according to claim 6, characterized in that it further includes... include: Base (7) Each of the positioning blocks (6) has a horizontally protruding protrusion (63) at its bottom. When each of the positioning blocks (6) is located within the positioning hole (3), the horizontal protrusion (63) of each of the positioning blocks (6) is located outside the positioning hole (3) and is in contact with the bottom surface of the fixture frame (1). The base (7) is fastened to the bottom surface of the fixture frame (1), and the horizontal protrusions (63) of each positioning block (6) are fastened between the bottom surface of the fixture frame (1) and the base (7).

10. The fixture for positioning and welding lithium-ion batteries according to claim 6, characterized in that, Hand-held parts (8) are provided at both opposite ends of the fixture frame (1).

11. The fixture for positioning and welding lithium-ion batteries according to claim 6, characterized in that, Fixture positioning parts (9) are respectively provided on the two opposite edges of the fixture frame (1).

12. The fixture for positioning and welding lithium-ion batteries according to claim 11, characterized in that, The fixture positioning parts (9) located on the two opposite edges of the fixture frame (1) are staggered.

13. The fixture for positioning and welding lithium-ion batteries according to claim 12, characterized in that, Each of the fixture positioning parts (9) is either an inwardly recessed part or an outwardly protruding part.

14. The fixture for positioning and welding lithium-ion batteries according to claim 6, characterized in that, A through hole (64) is provided in the recess (61) of each of the positioning blocks (6).

15. The fixture for positioning and welding lithium-ion batteries according to claim 14, characterized in that, The through hole (64) is located at the center of the recess (61).

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