Positioning device for multi-size battery chips

Abstract

The invention discloses a positioning device for multi-size battery chips, and belongs to the technical field of battery production. The positioning device comprises a bottom plate, a pole supporting assembly and two bar positioning assemblies, the pole supporting assembly comprises two positioning blocks, and each positioning block is provided with a stepped groove; each chip positioning assembly comprises a positioning module and a pressing module, the positioning module comprises a first support and a positioning plate, the first support is located on the bottom plate, two positioning pins are movably arranged on the positioning plate, the pressing module comprises a second support, a driving part and an elastic part, the second support is located on the bottom plate, and the driving part is located on the second support. The driving piece is movably arranged on the bottom plate in the first direction, and the elastic piece is provided with a light through hole used for laser welding machining. The positioning device for the multi-size battery chips, provided by the embodiment of the invention, not only can complete positioning and pressing of the positive electrode chips and the negative electrode chips on the battery poles, but also can adapt to the battery chips with different sizes.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery production, and in particular relates to a positioning device for battery tabs of multiple sizes. Background Art

[0002] In the field of batteries, in order to improve battery life, different numbers of batteries are often connected in series or parallel to form a battery module to provide the corresponding voltage or current for the load end. Currently, in battery modules, the battery plates and battery poles are mostly fixedly connected by welding, so that multiple batteries can be connected in series and parallel.

[0003] In the related art, before multiple batteries are connected in series and parallel, a positioning device is required to complete the positioning of multiple tabs (i.e., two positive tabs and two negative tabs) and battery poles (collectively referred to as battery tabs) to ensure the subsequent welding accuracy. However, the existing positioning device has poor positioning accuracy and cannot adapt to the positioning of battery tabs of different sizes. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a positioning device for battery tabs of multiple sizes, the purpose of which is: not only to complete the positioning and pressing of the positive tabs and the negative tabs on the battery poles, but also to have high positioning accuracy before and after the tabs are welded, and to be able to adapt to battery tabs of different sizes.

[0005] To achieve the above-mentioned object, the present invention provides a positioning device for battery tabs of multiple sizes, the positioning device comprising a bottom plate, a pole support assembly and two tab positioning assemblies;

[0006] The pole support assembly includes two positioning blocks, which are arranged on the bottom plate at intervals, and each positioning block is provided with a stepped groove, each of which includes groove monomers arranged in sequence along the back of the bottom plate, and each of which is used for inserting and positioning the corresponding battery pole;

[0007] Each of the bar-piece positioning assemblies includes a positioning module and a clamping module, the positioning module includes a first bracket and a positioning plate, the first bracket is located on the base plate, the positioning plate is movably arranged on the first bracket along a first direction, the positioning plate has two positioning pins movably arranged along a second direction and a third direction, each of the positioning pins is used to be inserted into the positioning hole of the corresponding positive bar piece or negative bar piece, the clamping module includes a second bracket, a driving member and an elastic member, the second bracket is located on the base plate, the driving member is movably arranged on the base plate along a first direction, the output end of the driving member is used to drive the elastic member to move along the first direction, the elastic member has a light-through hole for laser welding processing, and the elastic member is used to press two positive bar pieces or two negative bar pieces.

[0008] Optionally, the elastic member includes a connecting plate, a pressure block and multiple springs, the output end of the driving member is transmission-connected to the connecting plate, the two ends of each spring are transmission-connected to the connecting plate and the pressure block respectively, and the pressure block is located below the connecting plate, and the connecting plate and the pressure block both have coaxially arranged light-through holes.

[0009] Optionally, the elastic member also includes a guide rod, one end of which is movably inserted in the connecting plate, and one end of the guide rod is provided with an outer flange, the outer flange is located above the connecting plate, the other end of the guide rod is fixed on the pressure block, and each spring sleeve is arranged on the corresponding guide rod.

[0010] Optionally, a copper nozzle is installed on the pressing block, and the copper nozzle is used to blow protective gas to the light-through hole.

[0011] Optionally, the positioning plate has a movable plate, and the movable plate can be movably arranged on the positioning plate along the second direction and the third direction. The positioning pin is located on the movable plate, and the movable plate has a stopper to stick to the side of the positive electrode sheet or the negative electrode sheet.

[0012] Optionally, the movable plate has a through hole, the top surface of the movable plate is padded with a washer, a connecting bolt is inserted in the washer, the positioning plate has a threaded hole, the diameter of the through hole is larger than the diameter of the threaded hole, and the connecting bolt passes through the through hole and is inserted into the threaded hole.

[0013] Optionally, the bottom plate has a slide rail extending along the second direction, the slide rail is provided with a sliding plate for sliding fit, and the two positioning blocks and the two first brackets are all located on the sliding plate.

[0014] Optionally, the bottom plate is provided with a plurality of limit blocks, each of which is located at one end of the slide rail or the other end of the slide rail to limit the slide plate.

[0015] Optionally, the skateboard has a first magnet and the base plate has a second magnet, the first magnet and the second magnet attract each other, and when the skateboard abuts against at least one of the limit blocks, the first magnet and the second magnet face each other, and the positioning block is located directly below the elastic member.

[0016] Optionally, the first bracket and the second bracket each have a plurality of sockets arranged at intervals, the plurality of sockets extend along a first direction, the positioning plate and the driving member each have a latch, and each of the latches can be movably inserted into a corresponding socket.

[0017] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0018] In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

[0019] For a positioning device for multi-size battery tabs provided by an embodiment of the present invention, when positioning battery tabs of different sizes before welding, first, the battery pole is placed in the corresponding groove monomer on the right positioning block according to the diameter size of the battery pole. In addition, the positioning plate and the driving member are adjusted to the height on the corresponding bracket according to the height size of the battery pole, and the position of the positioning pin is adjusted on the positioning plate according to the shape of the corresponding positive tab or negative tab and the position of its positioning hole. Then, one end of the corresponding two negative tabs is placed on the corresponding welding point on the battery pole, and each positioning pin is inserted into the corresponding positioning hole on the corresponding negative tab at the same time, so that the two negative tabs can be accurately positioned. Then, the elastic member is lowered by the driving member, and the elastic member is lowered to press the other end of the two negative tabs (the elastic member can compensate for the installation error through elastic deformation on the one hand, and avoid excessive downward pressure on the tab) so that the two negative tabs are accurately pressed on the battery pole to avoid the tab from moving during subsequent welding. At this time, the light-through hole of the elastic member is facing the other end of each negative electrode tab, and the negative electrode tab and the battery pole can be welded by the laser welder above (the laser passes through the light-through hole to weld the welding point between the other end of the negative electrode tab and the battery pole). After the two negative electrode tabs are welded, place the welded battery pole in the corresponding groove monomer on the left positioning block, and repeat the above steps until the two positive electrode tabs are welded to the battery pole.

[0020] That is to say, the positioning device for multi-sized battery tabs provided by the embodiment of the present invention can not only complete the positioning and pressing of the positive tabs and the negative tabs on the battery poles, but also has high positioning accuracy before and after the tabs are welded, and can also adapt to battery tabs of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1 is a schematic structural diagram of a positioning device for multi-size battery tabs provided by an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of a positioning block provided in an embodiment of the present invention;

[0023] Figure 3 is a schematic structural diagram of an elastic member provided by an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of the structure of a positioning module provided by an embodiment of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the movable plate provided in an embodiment of the present invention.

[0026] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0027] 1. Bottom plate; 11. Slide rail; 12. Slide plate; 13. Limit block; 2. Pole support assembly; 21. Positioning block; 211. Step groove; 3. Bar positioning assembly; 31. Positioning module; 311. First bracket; 312. Positioning plate; 313. Positioning pin; 314. Movable plate; 3141. Block; 3142. Through hole; 315. Washer; 32. Pressing module; 321. Second bracket; 322. Driving member; 323. Elastic member; 3231. Connecting plate; 3232. Pressing block; 3233. Spring; 3234. Guide rod; 3235. Copper nozzle; 324. Light hole; 100. Battery pole; 201. Positive bar; 202. Negative bar. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] Example:

[0034] Figure 1 is a schematic diagram of a structure of a positioning device for multi-size battery tabs provided by an embodiment of the present invention, such as Figure 1As shown, the positioning device includes a bottom plate 1, a pole support assembly 2 and two bar piece positioning assemblies 3 (i.e., one bar piece positioning assembly 3 positions two positive pole bars 201 on the battery pole piece, and the other bar piece positioning assembly 3 positions two negative pole bars 202 on the battery pole piece). The pole support assembly 2 includes two positioning blocks 21, and the two positioning blocks 21 are arranged on the bottom plate 1 at intervals.

[0035] Figure 2 is a schematic diagram of the structure of the positioning block provided in an embodiment of the present invention, such as Figure 2 As shown, each positioning block 21 is provided with a stepped groove 211, and each stepped groove 211 includes groove monomers arranged in sequence along the back side of the bottom plate 1, and each groove monomer is used to insert and position the corresponding battery pole 100 (that is, multiple groove units are connected in sequence, and the diameter of the groove monomer located above is larger than the diameter of the groove monomer located below).

[0036] Each bar piece positioning assembly 3 includes a positioning module 31 and a pressing module 32. The positioning module 31 includes a first bracket 311 and a positioning plate 312. The first bracket 311 is located on the bottom plate 1. The positioning plate 312 is movably arranged on the first bracket 311 along a first direction (Z-axis direction). The positioning plate 312 has two positioning pins 313 that can be movably arranged along a second direction (X-axis direction) and a third direction (Y-axis direction). Each positioning pin 313 is used to be inserted into the corresponding positive bar piece 201 or In the positioning hole of the negative electrode tab 202, the clamping module 32 includes a second bracket 321, a driving member 322 and an elastic member 323. The second bracket 321 is located on the base plate 1. The driving member 322 is movably arranged on the base plate 1 along a first direction. The output end of the driving member 322 is used to drive the elastic member 323 to move along the first direction. The elastic member 323 has a light hole 324 for laser welding processing. The elastic member 323 is used to press two positive electrode tabs 201 or two negative electrode tabs 202.

[0037] For a positioning device for multi-sized battery tabs provided in an embodiment of the present invention, when positioning battery tabs of different sizes before welding, first, the battery pole 100 is placed in the corresponding groove monomer on the right positioning block 21 according to the diameter size of the battery pole 100. In addition, the positioning plate 312 and the driving member 322 are adjusted to the height on the corresponding bracket according to the height size of the battery pole 100, and the position of the positioning pin 313 is adjusted on the positioning plate 312 according to the shape of the corresponding positive tab 201 or negative tab 202 and the position of its positioning hole. Then, one end of the corresponding two negative tabs 202 is placed on the corresponding welding point on the battery pole 100, and each positioning pin 313 is inserted into the corresponding positioning hole on the corresponding negative tab 202 at the same time, so that the two negative tabs 202 can be accurately positioned. Next, the elastic member 323 is lowered by the driving member 322. After the elastic member 323 is lowered, it will press the other end of the two negative electrode tabs 202 (the elastic member 323 can compensate for the installation error through elastic deformation, and avoid excessive downward pressure on the tabs), so that the two negative electrode tabs 202 are accurately pressed on the battery column 100 to prevent the tabs from moving during the subsequent welding process. At this time, the light hole 324 of the elastic member 323 is facing the other end of each negative electrode tab 202, and the welding of the negative electrode tab 202 and the battery column 100 can be completed by the laser welder above (the laser passes through the light hole 324 to weld the other end of the negative electrode tab 202 and the welding point of the battery column 100). After the welding of the two negative electrode tabs 202 is completed, the welded battery column 100 is placed in the corresponding groove monomer on the left positioning block 21, and the above steps are repeated until the two positive electrode tabs 201 are welded to the battery column 100.

[0038] That is to say, the positioning device for multi-sized battery tabs provided by the embodiment of the present invention can not only complete the positioning and pressing of the positive tab 201 and the negative tab 202 on the battery pole 100, but also has high positioning accuracy before and after the tab welding, and can adapt to battery tabs of different sizes.

[0039] Exemplarily, the driving member 322 may be a cylinder or a linear module.

[0040] Figure 3 is a schematic diagram of the structure of the elastic member provided in an embodiment of the present invention, such as Figure 3 As shown, the elastic member 323 includes a connecting plate 3231, a pressure block 3232 and a plurality of springs 3233. The output end of the driving member 322 is transmission-connected to the connecting plate 3231. The two ends of each spring 3233 are transmission-connected to the connecting plate 3231 and the pressure block 3232 respectively. The pressure block 3232 is located below the connecting plate 3231. Both the connecting plate 3231 and the pressure block 3232 have coaxially arranged light-through holes 324.

[0041] In the above embodiment, the connecting plate 3231 serves to connect the output end of the driving member 322 and the elastic member 323, and the spring 3233 can produce elastic deformation to buffer and compensate for installation errors of the pressing block 3232, while the pressing block 3232 serves to press the bar.

[0042] Exemplarily, the pressing block 3232 is a T-shaped structure, that is, the lower end is small in size, the upper end is large in size, and the lower end is in contact with the other end of the bar.

[0043] Furthermore, the elastic member 323 further includes a guide rod 3234, one end of which is movably inserted in the connecting plate 3231, and one end of the guide rod 3234 is provided with an outer flange, which is located above the connecting plate 3231, and the other end of the guide rod 3234 is fixed on the pressing block 3232, and each spring 3233 is sleeved on the corresponding guide rod 3234. The outer flange can prevent the guide rod 3234 from falling off the connecting plate 3231, and the guide rod 3234 can guide the deformation of the spring 3233.

[0044] In addition, a copper nozzle 3235 is inserted into the pressing block 3232, and the copper nozzle 3235 is used to blow protective gas into the light hole 324. By blowing protective gas into the copper nozzle 3235, the welding slag generated during the welding process can be blown away in time to avoid accumulation on the battery pole 100.

[0045] Figure 4 is a schematic diagram of the structure of a positioning module provided in an embodiment of the present invention, Figure 5 is a schematic diagram of the structure of the movable plate provided by an embodiment of the present invention, combined with Figure 4 and Figure 5 As shown, the positioning plate 312 has a movable plate 314, which can be movably arranged on the positioning plate 312 along the second direction and the third direction. The positioning pin 313 is located on the movable plate 314, and the movable plate 314 has a stopper 3141 to stick to the side of the positive electrode tab 201 or the negative electrode tab 202.

[0046] In the above embodiment, the movable plate 314 can be moved to move the positioning pin 313, so as to adapt to the tabs of different sizes and shapes. In addition, the stopper 3141 can limit the side of the tab, so as to cooperate with the positioning function of the positioning pin 313 to prevent the tab from rotating, thereby achieving the precise positioning of one end of the tab on the movable plate 314, and finally achieving the precise positioning of the other end of the tab relative to the battery pole 100.

[0047] Exemplarily, the stopper 3141 is integrally formed with the movable plate 314 .

[0048] Furthermore, the movable plate 314 has a through hole 3142, the top surface of the movable plate 314 is padded with a washer 315, a connecting bolt (not shown) is inserted in the washer 315, and the positioning plate 312 has a threaded hole, the diameter of the through hole 3142 is larger than the diameter of the threaded hole, and the connecting bolt passes through the through hole 3142 and is inserted into the threaded hole.

[0049] It is easy to understand that when it is necessary to adjust the position of the positioning pin 313 relative to the positioning plate 312, first loosen the connecting bolt, then move the movable plate 314 and the washer 315 accordingly (that is, adjust the relative arrangement of the connecting bolt in the through hole 3142), which can also lead to the movement of the positioning pin 313, and finally retighten the connecting bolt.

[0050] See again Figure 1 The bottom plate 1 has a slide rail 11 extending along the second direction, the slide rail 11 is provided with a sliding plate 12 for sliding fit, and the two positioning blocks 21 and the two first brackets 311 are all located on the slide plate 12 .

[0051] In the above embodiment, the horizontal position of the slide plate 12 relative to the clamping module 32 on the base plate 1 can be adjusted by sliding the slide plate 12 on the slide rail 11, thereby adjusting the position of the positioning block 21 and the two first brackets 311 and the clamping module 32 to facilitate the installation of the battery pole 100 and the bar.

[0052] For example, before installing the battery pole 100 and the tab, the slide plate 12 is pulled outward to dislocate the positioning block 21 and the elastic member 323. At this time, the battery pole 100 and the corresponding tab can be easily installed to prevent the pressing module 32 from interfering with the installation of the battery pole 100 and the tab. After the battery pole 100 and the tab are installed, the slide plate 12 is pushed inward to slide the positioning block 21 to the bottom of the elastic member 323.

[0053] Exemplarily, the slide plate 12 has a handle to facilitate pulling the slide plate 12 to move.

[0054] Furthermore, the bottom plate 1 has a plurality of limit blocks 13, each of which is located at one end of the slide rail 11 or the other end of the slide rail 11 to limit the position of the slide plate 12. The limit blocks 13 can prevent the slide plate 12 from detaching from the slide rail 11 during the sliding process.

[0055] In addition, the slide plate 12 has a first magnet, and the bottom plate 1 has a second magnet, and the first magnet and the second magnet attract each other. When the slide plate 12 abuts against at least one limit block 13, the first magnet and the second magnet face each other, and the positioning block 21 is located directly below the elastic member 323. That is, when the slide plate 12 abuts against at least one limit block 13, the positioning block 21 just slides to the bottom of the elastic member 323, and the first magnet and the second magnet face each other and attract each other, so as to keep the slide plate 12 in a locked state, that is, the magnetic force provided between the two magnets is used to prevent the slide plate 12 from sliding accidentally after sliding into place.

[0056] In one implementation of the present invention, the first bracket 311 and the second bracket 321 are each provided with a plurality of jacks arranged at intervals, and the plurality of jacks extend along a first direction. The positioning plate 312 and the driving member 322 are each provided with a pin, and each pin can be movably inserted into a corresponding jack, so that the height of the positioning plate 312 and the driving member 322 can be conveniently adjusted through the cooperation of the jack and the pin, and then the height of the positioning pin 313 and the elastic member 323 can be adjusted, so that the positioning of battery poles 100 of different sizes can be achieved.

[0057] It should be noted that the movable plate 314 , the positioning pin 313 and the pressing block 3232 are all insulating structures, which can have an insulating effect on the battery pole 100 and the tab.

[0058] Exemplarily, the bottom plate 1 , the slide plate 12 , the positioning plate 312 , the movable plate 314 and the connecting plate 3231 are all arranged horizontally, and the guide rod 3234 is arranged vertically.

[0059] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A positioning device for battery tabs of multiple sizes, characterized in that: The positioning device comprises a base plate (1), a pole support assembly (2) and two bar positioning assemblies (3); The pole support assembly (2) comprises two positioning blocks (21), the two positioning blocks (21) are arranged at intervals on the bottom plate (1), and each positioning block (21) is provided with a stepped groove (211), each stepped groove (211) comprises groove monomers arranged in sequence along the back of the bottom plate (1), and each groove monomer is used for inserting and positioning a corresponding battery pole (100); Each of the bar sheet positioning assemblies (3) comprises a positioning module (31) and a pressing module (32), wherein the positioning module (31) comprises a first bracket (311) and a positioning plate (312), wherein the first bracket (311) is located on the bottom plate (1), wherein the positioning plate (312) is movably arranged on the first bracket (311) along a first direction, wherein the positioning plate (312) has two positioning pins (313) movably arranged along a second direction and a third direction, wherein each of the positioning pins (313) is used for being inserted into a corresponding positioning pin of a positive bar sheet (201) or a negative bar sheet (202). The clamping module (32) comprises a second bracket (321), a driving member (322) and an elastic member (323), wherein the second bracket (321) is located on the base plate (1), and the driving member (322) is movably arranged on the base plate (1) along a first direction, and the output end of the driving member (322) is used to drive the elastic member (323) to move along the first direction, and the elastic member (323) has a light-through hole (324) for laser welding processing, and the elastic member (323) is used to press two positive electrode sheets (201) or two negative electrode sheets (202).

2. A positioning device for multi-size battery tabs according to claim 1, characterized in that: The elastic member (323) comprises a connecting plate (3231), a pressure block (3232) and a plurality of springs (3233); the output end of the driving member (322) is transmission-connected to the connecting plate (3231); the two ends of each spring (3233) are transmission-connected to the connecting plate (3231) and the pressure block (3232), respectively; the pressure block (3232) is located below the connecting plate (3231); and the connecting plate (3231) and the pressure block (3232) are both provided with coaxially arranged light-through holes (324).

3. A positioning device for multi-size battery tabs according to claim 2, characterized in that: The elastic member (323) further comprises a guide rod (3234), one end of which is movably inserted into the connecting plate (3231), and one end of the guide rod (3234) is provided with an outer flange, the outer flange is located above the connecting plate (3231), the other end of the guide rod (3234) is fixed on the pressing block (3232), and each of the springs (3233) is sleeved on the corresponding guide rod (3234).

4. A positioning device for multi-size battery tabs according to claim 2, characterized in that: A copper nozzle (3235) is inserted into the pressing block (3232), and the copper nozzle (3235) is used to blow protective gas toward the light-through hole (324).

5. The positioning device for multi-size battery tabs according to claim 1, characterized in that: The positioning plate (312) has a movable plate (314), and the movable plate (314) can be movably arranged on the positioning plate (312) along the second direction and the third direction. The positioning pin (313) is located on the movable plate (314), and the movable plate (314) has a stopper (3141) to be attached to the side of the positive electrode sheet (201) or the negative electrode sheet (202).

6. A positioning device for multi-size battery tabs according to claim 5, characterized in that: The movable plate (314) has a through hole (3142), the top surface of the movable plate (314) is padded with a washer (315), a connecting bolt is inserted into the washer (315), the positioning plate (312) has a threaded hole, the diameter of the through hole (3142) is larger than the diameter of the threaded hole, and the connecting bolt passes through the through hole (3142) and is inserted into the threaded hole.

7. A positioning device for multi-sized battery tabs according to any one of claims 1 to 6, characterized in that: The bottom plate (1) has a slide rail (11) extending along the second direction, the slide rail (11) is provided with a sliding plate (12) for sliding fit, and the two positioning blocks (21) and the two first brackets (311) are both located on the sliding plate (12).

8. A positioning device for multi-sized battery tabs according to claim 7, characterized in that: The bottom plate (1) is provided with a plurality of limit blocks (13), each of the limit blocks (13) being located at one end of the slide rail (11) or the other end of the slide rail (11) to limit the position of the slide plate (12).

9. A positioning device for multi-sized battery tabs according to claim 8, characterized in that: The slide plate (12) has a first magnet, and the bottom plate (1) has a second magnet, the first magnet and the second magnet attract each other, and when the slide plate (12) abuts against at least one of the limit blocks (13), the first magnet and the second magnet face each other, and the positioning block (21) is located directly below the elastic member (323).

10. A positioning device for multi-sized battery tabs according to any one of claims 1 to 6, characterized in that: The first bracket (311) and the second bracket (321) are each provided with a plurality of insertion holes arranged at intervals, and the plurality of insertion holes extend along a first direction. The positioning plate (312) and the driving member (322) are each provided with a latch, and each of the latch pins can be movably inserted into a corresponding insertion hole.

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