Collecting disc welding device

Abstract

The utility model provides a collector plate welding device which comprises a first clamp and a laser welding machine, the first clamp comprises a first pressing head and a first fixing assembly, the first fixing assembly is configured to fix a battery cell, the first pressing head and the first fixing assembly are oppositely arranged, and the laser welding machine is arranged on the first pressing head; the first pressure head is configured to press the first current collecting plate on the first end of the battery cell; a positioning hole and a first welding hole are formed in the first face, facing the first fixing assembly, of the first pressing head, and the positioning hole is configured to contain a protruding part on the center portion of a first flow collecting disc. The laser welding machine is arranged on the side, away from the first fixing assembly, of the first pressing head, and laser emitted by the laser welding machine can irradiate the welding area of the first current collecting disc through the first welding hole so as to weld the first current collecting disc and a tab at the first end of a battery cell together. And the coaxiality of the collector plate and the battery cell during welding can be improved.

Description

Technical Field

[0001] The present application relates to the field of welding technology, and in particular to a current collecting plate welding device. Background Art

[0002] Secondary batteries, also known as rechargeable batteries or storage batteries, refer to batteries that can continue to be used by activating the active substances by charging after the battery is discharged. The recyclable nature of secondary batteries has made them gradually become the main power source for electrical equipment.

[0003] Typically, a secondary battery includes a battery cell and a current collector connected to a tab on the battery cell; however, during the manufacturing process of existing secondary batteries, when the current collector and the tab are laser welded, the coaxiality of the current collector and the battery cell is poor, resulting in a low product yield. Utility Model Content

[0004] A main purpose of the present application is to provide a current collecting plate welding device, which can improve the coaxiality of the welded current collecting plate and the battery cell.

[0005] In order to achieve the above application purpose, this application adopts the following technical solutions:

[0006] According to one aspect of the present application, a current collecting plate welding device is provided, the current collecting plate welding device comprising:

[0007] a first clamp, the first clamp comprising a first pressing head and a first fixing assembly, the first fixing assembly being configured to fix the battery cell, the first pressing head being arranged opposite to the first fixing assembly, the first pressing head being configured to press the first current collecting disk onto the first end of the battery cell; a positioning hole and a first welding hole being formed on a first surface of the first pressing head facing the first fixing assembly, the positioning hole being configured to accommodate a protrusion on a central portion of the first current collecting disk;

[0008] A laser welder is arranged on a side of the first pressure head away from the first fixing assembly, and the laser emitted by the laser welder can irradiate the welding area of ​​the first current collecting disk through the first welding hole to weld the first current collecting disk to the tab on the first end of the battery cell.

[0009] In an exemplary embodiment of the present disclosure, the first fixture further includes:

[0010] A positioning member is arranged on the first surface of the first pressure head. When the protrusion of the first collecting disk is located in the positioning hole of the first pressure head, the positioning member is configured to be located in the notch at the edge of the first collecting disk to form a limit for the circumferential rotation of the first collecting disk.

[0011] In an exemplary embodiment of the present disclosure, the positioning protrusion is detachably connected to the first pressing head.

[0012] In an exemplary embodiment of the present disclosure, an assembly hole is provided on the first pressure head, and the positioning member includes a mounting portion, an elastic portion and a positioning portion, the mounting portion is located in the assembly hole and fixedly connected to the first pressure head, the elastic portion connects the mounting portion and the positioning portion, and the positioning portion can be located at an extended position extending out of the assembly hole and a recovered position retracted into the assembly hole through the elastic portion, and the positioning portion is configured to be located in a notch on the edge of the first collecting plate when in the extended position.

[0013] In an exemplary embodiment of the present disclosure, the first pressing head includes a second surface opposite to the first surface, and the positioning hole passes through the first surface and the second surface of the first pressing head.

[0014] In an exemplary embodiment of the present disclosure, the current collecting plate welding device further includes:

[0015] A negative pressure assembly includes a vacuum nozzle, wherein the vacuum nozzle extends from the second surface of the first pressure head into the positioning hole to form a negative pressure at an opening of the positioning hole located on the first surface.

[0016] In an exemplary embodiment of the present disclosure, a negative pressure channel and a negative pressure hole connected to the negative pressure channel are formed on the first pressure head, and the negative pressure hole is located on the first surface.

[0017] In an exemplary embodiment of the present disclosure, a positioning groove is formed on the first surface of the first pressure head, and the positioning groove is used to accommodate the collecting plate.

[0018] In an exemplary embodiment of the present disclosure, the positioning hole is formed on a central area of ​​the positioning groove.

[0019] In an exemplary embodiment of the present disclosure, the diameter of at least a portion of the positioning hole decreases from one end of the first surface toward the other end.

[0020] In an exemplary embodiment of the present disclosure, the positioning hole is a stepped hole, the stepped hole has a stepped surface, and the stepped surface faces the first fixing component.

[0021] In an exemplary embodiment of the present disclosure, the first fixing assembly includes a first base and a first clamp, a fixing groove is formed on the first base, the fixing groove is configured to place a battery cell, and the first clamp is configured to clamp the battery cell placed in the fixing groove.

[0022] In an exemplary embodiment of the present disclosure, the current collecting plate welding device further includes:

[0023] The second clamp includes a second pressing head and a second fixing component, the second fixing component is configured to fix the battery cell, the second pressing head is arranged opposite to the second fixing component, and the second pressing head is configured to press the second collecting plate onto the second end of the battery cell; a second welding hole is formed on the second pressing head.

[0024] In an exemplary embodiment of the present disclosure, a positioning protrusion is provided on a surface of the second pressure head facing the second fixing assembly, and the positioning protrusion is configured to extend into a positioning through hole on a central portion of the second collecting plate.

[0025] In an exemplary embodiment of the present disclosure, the laser welder is movably disposed on a side of the first pressure head away from the first fixing component and on a side of the second pressure head away from the second fixing component, so that the laser emitted by the laser welder can irradiate the welding area of ​​the second current collecting plate through the second welding hole to weld the second current collecting plate to the pole ear on the second end of the battery cell.

[0026] In the current collecting plate welding device provided by the present invention, when the pressure head of the first clamp cooperates with the positive current collecting plate, the positioning hole is used to accommodate the protrusion on the central part of the current collecting plate, that is, the positioning hole cooperates with the protrusion to realize the concentricity positioning between the current collecting plate and the pressure head, thereby improving the coaxiality of the alignment of the current collecting plate and the battery cell; then the welding area of ​​the current collecting plate is laser welded to the pole ear of the battery cell through the welding hole, so that the welding trajectory offset ratio when the welding area of ​​the current collecting plate is welded to the pole ear of the battery cell can be reduced to 0%, thereby improving the production yield and production efficiency of the product and reducing the production cost.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0029] Figure 1 A schematic diagram of the structure of a household energy storage system provided in one embodiment of the present disclosure.

[0030] Figure 2 A schematic diagram of a cylindrical battery provided for one embodiment of the present disclosure.

[0031] Figure 3 A front schematic diagram of a positive electrode current collecting disk provided in an embodiment of the present disclosure.

[0032] Figure 4 A schematic diagram of the back side of a positive electrode current collecting disk provided in one embodiment of the present disclosure.

[0033] Figure 5 A front schematic diagram of a negative electrode current collecting disc and an end cover unit provided for an embodiment of the present disclosure.

[0034] Figure 6 A schematic diagram of the reverse side of a negative electrode current collecting disc and an end cover unit provided in an embodiment of the present disclosure.

[0035] Figure 7 A schematic diagram of a current collecting plate welding device provided in one embodiment of the present disclosure.

[0036] Figure 8 A schematic diagram of opening the protective cover of a current collecting plate welding device provided in an embodiment of the present disclosure.

[0037] Fig. 9 A schematic diagram of a first clamp provided for an embodiment of the present disclosure.

[0038] Fig.10 A front schematic diagram of a first clamp provided for an embodiment of the present disclosure.

[0039] Fig.11 A schematic diagram of a second surface of a first pressure head provided for an embodiment of the present disclosure.

[0040] Fig.12 A schematic diagram of a first surface of a first pressure head provided for an embodiment of the present disclosure.

[0041] Fig.13 A schematic diagram of a first pressure head and a negative pressure assembly provided for an embodiment of the present disclosure.

[0042] Fig.14 A schematic diagram of a first pressure head, a negative pressure assembly and a positioning member provided for an embodiment of the present disclosure.

[0043] Fig.15 A schematic diagram of a positioning member provided for an embodiment of the present disclosure.

[0044] Fig.16 A schematic diagram of a negative pressure assembly provided for one embodiment of the present disclosure.

[0045] Fig.17 A schematic diagram of a negative pressure assembly from another perspective provided for an embodiment of the present disclosure.

[0046] Fig.18 A schematic diagram of a second clamp provided for an embodiment of the present disclosure.

[0047] Fig.19 A schematic diagram of the front side of a second pressure head provided for an embodiment of the present disclosure.

[0048] Fig. 20A schematic diagram of the reverse side of a second pressure head provided for an embodiment of the present disclosure.

[0049] Description of reference numerals:

[0050] 10. Energy storage device; 20. Electric energy conversion device; 30. User load; 40. Collector plate welding device.

[0051] 110, positive electrode current collecting disc; 111, raised portion; 112, first welding area; 113, notch; 120, battery cell; 130, negative electrode current collecting disc; 131, disc body; 1311, positioning through hole; 1312, second welding area; 132, connecting portion; 140, end cap unit;

[0052] 410, first fixture; 411, first pressure head; 4111, positioning hole; 4112, first welding hole; 4113, assembly hole; 4114, first mounting hole; 4115, first air inlet hole; 4116, second fixing hole; 4117, positioning groove; 412, negative pressure assembly; 4121, fixing part; 4122, first fixing hole; 4123, vacuum nozzle; 4124, negative pressure interface; 4125, negative pressure hole; 4126, abutting part; 413, positioning member; 4131, mounting part; 4132, elastic part; 4133, positioning part; 414, first pressing plate; 415, first fixing seat; 416, first base; 417, first clamping claw; 418, first bottom plate;

[0053] 420, second fixture; 421, second pressure head; 4211, positioning protrusion; 4212, second welding hole; 4213, avoidance groove; 4214, second mounting hole; 4215, second air inlet hole; 4216, negative pressure through hole; 424, second pressing plate; 425, second fixing seat; 426, second base; 427, second clamping claw; 428, second bottom plate;

[0054] 430. Laser welding machine; 441. Positive electrode welding tooling slide rail; 442. Negative electrode welding tooling slide rail; 450. Workbench; 460. Protective cover; 470. Control terminal; 480. Wiring pipe. DETAILED DESCRIPTION

[0055] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0056] Since the energy people need is highly temporal and spatial, in order to rationally use energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same form or convert it into another form of energy, and then release it in a specific form of energy based on future application needs. As we all know, to achieve the goal of carbon neutrality, green energy is currently mainly used to replace fossil energy to achieve the purpose of generating green electricity.

[0057] The current green energy mainly includes solar energy, wind energy, hydropower, etc. However, solar energy and wind energy generally have problems of strong intermittency and large volatility, which will cause unstable voltage of the green power grid (not enough electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, it may cause the problem of "wind and solar power abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0058] To solve the problem of insufficient electricity demand or insufficient grid acceptance capacity, we must rely on energy storage devices. That is, the energy storage device converts electrical energy into other forms of energy through physical or chemical means and stores it, and then converts the energy stored in the energy storage device into electrical energy when needed. In simple terms, the energy storage device is similar to a large "power bank", which stores electrical energy when there is sufficient light energy and wind energy, and releases the stored electrical energy when needed.

[0059] At present, energy storage (i.e. energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage and user side energy storage. The corresponding types of energy storage devices include:

[0060] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, relieving peak load power supply pressure, and peak and frequency regulation;

[0061] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity charges at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0062] Take the household energy storage scenario in user-side energy storage as an example to illustrate. Figure 1 A household energy storage system is shown, which includes an energy storage device 10 and an electric energy conversion device 20 (such as a photovoltaic panel), and a user load 30 (such as a street lamp, household appliances, etc.). The energy storage device 10 is a small energy storage box that can be mounted on an outdoor wall by wall hanging. Specifically, the electric energy conversion device 20 can convert solar energy into electric energy during the low electricity price period, and store it through the energy storage device 10, and then supply the user load 30 for use during the peak electricity price, or supply the user load 30 for use when the power grid is off / power outage.

[0063] In combination with the above-mentioned situation of storing energy by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 10 includes at least one group of chemical batteries, using the chemical elements in the chemical batteries as energy storage media, so as to realize the charging and discharging process through the chemical reaction or change of the energy storage medium. In simple terms, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through the chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or transferred to a place where electric energy is scarce for use.

[0064] The energy storage device may be, but is not limited to, a single cell, a battery module, a battery pack, a battery system, etc. As for the single cell, it may be a lithium-ion secondary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc. The single cell may be cylindrical, flat, rectangular, etc., and the embodiments of the present application do not limit this.

[0065] Figure 2 The schematic diagram of the structure of a cylindrical battery provided by the embodiment of the present application is illustrated. Figure 2 As shown, the cylindrical battery includes: a battery shell and a battery cell 120, the battery shell has a receiving cavity, and the battery cell 120 is received in the receiving cavity.

[0066] The battery shell includes a shell and an end cover unit 140. The shell can be a cylindrical structure with one end open. In this case, the energy storage device includes an end cover unit 140 to seal one opening of the shell. Of course, the lower shell can also be a cylindrical structure with both ends open. In this case, the energy storage device includes an end cover unit 140 and a cover plate, or includes two end cover units 140. In this way, one end cover unit 140 and a cover plate, or two end cover units 140 can respectively seal the two openings of the lower shell.

[0067] Among them, the end cap unit 140 includes an end cap body and an electrode terminal. The electrode terminal is penetrated on the end cap body, and one end is connected to the electrode assembly, and the other end is exposed outside the battery shell to serve as an output end of the energy storage device; an explosion-proof valve and a liquid injection hole are provided on the end cap body. The explosion-proof valve is used to discharge the gas in the containing cavity of the battery shell to improve the safety of the use of the energy storage device, and the liquid injection hole is used to inject electrolyte into the containing cavity of the energy storage device.

[0068] The battery cell 120 includes a stacked positive electrode sheet, a negative electrode sheet and a separator, and the separator is located between the positive electrode sheet and the negative electrode sheet. The ends of the positive electrode sheet and the negative electrode sheet have tabs to form positive and negative tabs of the cylindrical battery. The positive electrode ear and the negative electrode ear can be located at the same end of the battery cell 120, or at different ends of the battery cell 120. When the positive electrode ear and the negative electrode ear are located at the same end of the electrode assembly, the positive electrode ear and the negative electrode ear are respectively connected to the positive terminal and the negative terminal included in the end cap unit 140, so as to realize the output of electric energy of the electrode assembly through the positive terminal and the negative terminal; when the positive electrode ear and the negative electrode ear are located at both ends of the electrode assembly, one of the positive electrode ear and the negative electrode ear is connected to the electrode terminal included in the end cap unit 140, and the other is connected to the bottom of the lower shell or the electrode terminal included in the other end cap unit 140, so as to realize the output of electric energy of the battery cell 120 through the electrode terminal of the end cap unit 140 and the bottom of the shell, or through the electrode terminals of the two end cap units 140.

[0069] The cylindrical battery further includes a current collecting plate, through which one tab of the battery cell 120 can be connected to an electrode terminal of the end cap unit 140 , and another tab of the battery cell 120 can be connected to the bottom of the lower shell.

[0070] When a positive electrode collector plate 110 and a negative electrode collector plate 130 are respectively provided at both ends of a cylindrical battery, and the shell (aluminum shell) of the cylindrical battery is positively charged, after the positive electrode collector plate 110 is laser welded with the positive electrode ear, the positive electrode collector plate 110 abuts against the bottom of the shell after the battery cell 120 is put into the shell to achieve electrical connection; after the negative electrode collector plate 130 is welded with the negative electrode ear, it is electrically connected to the electrode terminal on the end cover unit 140.

[0071] Among them, Figure 3 and Figure 4 As shown, the positive electrode current collecting plate 110 is usually connected to the shell, and a protrusion 111 for connecting to the bottom of the shell is provided at its center; Figure 5 and Figure 6 As shown, the negative electrode current collecting disc 130 is usually electrically connected to the electrode terminal on the end cover unit 140, and includes a disc body 131 and a connecting portion 132. The disc body 131 can be folded back onto the end cover unit 140 through the flexible connecting portion 132, and a positioning through hole 1311 is provided at the center of the disc body 131.

[0072] In the manufacturing process of cylindrical batteries, when laser welding is performed on the positive electrode collector disc 110 and the full pole ear of the positive electrode on the battery cell 120, it is necessary to ensure the concentricity of the positive electrode collector disc 110 and the battery cell 120; currently, the three notches of the positive electrode collector disc 110 are clamped by three protrusions fixed on the tooling fixture to achieve the clamping of the positive electrode collector disc 110; however, since the incoming material of the positive electrode collector disc 110 has a tolerance, the existing tooling has a low ability to accommodate the tolerance of the incoming material. If the tolerance of the incoming material is slightly larger, the protrusions on the tooling fixture will not be able to clamp the positive electrode collector disc 110, and the positive electrode collector disc 110 is likely to fall off; if the notches on the positive electrode collector disc 110 If it is slightly smaller, the protrusion on the tooling fixture will not be stuck, and the tooling will be worn out due to long-term use; furthermore, if the welding tooling of the positive current collector 110 is not positioned stably, it will lead to poor welding trajectory deviation due to insufficient positioning accuracy; in addition, when the copper nozzle is pressed down, the positive current collector 110 is easy to fall directly onto the ear of the battery cell 120 without external force restraint; if manual loading is used, the horizontal consistency of the positive current collector 110 is poor, and the positioning is easy to deviate, resulting in welding deviation and inability to enter the shell; according to on-site statistics, the scrap rate of cylindrical battery manufacturing is as high as about 6% due to the above reasons, which seriously affects the production efficiency of cylindrical batteries and increases production costs.

[0073] Hereinafter, the technical solution proposed by the present disclosure to solve the above technical problems will be discussed in detail by taking the above-mentioned positive electrode current collecting disc 110 as the first current collecting disc and the negative electrode current collecting disc 130 as the second current collecting disc as an example.

[0074] The present disclosure provides a current collecting plate welding device, such as Figure 2 to Figure 12 As shown, the collector plate welding device 40 includes: a first fixture 410 and a laser welder 430, the first fixture 410 includes a first pressing head 411 and a first fixing component, the first fixing component is configured to fix the battery cell 120, the first pressing head 411 is arranged opposite to the first fixing component, and the first pressing head 411 is configured to press the positive electrode collector plate 110 onto the first end of the battery cell 120; the first pressing head 411 is formed with a positioning hole 4111 and a first welding hole 4112 on the first surface facing the first fixing component, and the positioning hole 4111 and the first welding hole 4112 are formed ... The positioning hole 4111 is configured to accommodate the protrusion 111 on the central part of the positive current collecting disc 110, and the first welding hole 4112 is used to correspond to the first welding area 112 of the positive current collecting disc 110; the laser welder 430 is arranged on the side of the first pressure head 411 away from the first fixing component, and the laser emitted by the laser welder 430 can irradiate the welding area of ​​the positive current collecting disc 110 through the first welding hole 4112 to weld the positive current collecting disc 110 and the pole ear on the first end of the battery cell 120 together.

[0075] In the current collecting plate welding device 40 provided by the present invention, when the first pressing head 411 of the first clamp 410 cooperates with the positive current collecting plate 110, the positioning hole 4111 is used to accommodate the protrusion 111 on the central part of the positive current collecting plate 110, that is, the positioning hole 4111 cooperates with the protrusion 111 to realize the concentricity positioning between the positive current collecting plate 110 and the first pressing head 411, thereby improving the coaxiality of the positive current collecting plate 110 and the battery cell 120; then, a laser welder 430 is used to laser weld the first welding area 112 of the positive current collecting plate 110 with the pole ear of the battery cell 120 through the first welding hole 4112, so that the welding track deviation ratio when the first welding area 112 of the positive current collecting plate 110 is welded to the pole ear of the battery cell 120 can be reduced to 0%, thereby improving the production yield and production efficiency of the product and reducing the production cost.

[0076] In one embodiment, Figure 3 and Fig.14 As shown, a positioning member 413 is also provided on the first surface of the first pressing head 411. When the protrusion 111 is located in the positioning hole 4111 of the first pressing head 411, the positioning member 413 is used to be located in the notch 113 at the edge of the positive current collecting disc 110 to form a limit for the rotation of the positive current collecting disc 110 in the circumferential direction. By setting the positioning member 413 to cooperate with the notch 113 at the edge of the positive current collecting disc 110, when the positive current collecting disc 110 is located in the positioning hole 4111 of the first pressing head 411 through the central protrusion 111 to achieve concentricity positioning, the limit of the rotation of the positive current collecting disc 110 relative to the first pressing head 411 in the circumferential direction is achieved at the same time, that is, the angular positioning of the first pressing head 411 in the circumferential direction is formed, and the angular deviation of the positive current collecting disc 110 after the angular positioning in the circumferential direction is avoided, and the positioning effect of the positive current collecting disc 110 is further improved, and the welding effect of the positive current collecting disc 110 and the pole ear is improved.

[0077] Among them, one or more positioning members 413 can be provided, and one or more notches 113 on the positive current collecting disk 110 can be provided; the number of positioning members 413 and the number of notches 113 can be the same, that is, the positioning members 413 are located in each notch 113 one by one; or, the number of positioning members 413 is less than the number of notches 113, for example, three notches 113 are provided on the positive current collecting disk 110, and only one positioning member 413 is provided; it is sufficient to realize the circumferential positioning of the positive current collecting disk 110, and the present disclosure does not limit the number of positioning members 413 and notches 113.

[0078] In one embodiment, Fig.11 and Fig.12As shown, the first pressure head 411 is provided with an assembly hole 4113, and the positioning member 413 is detachably arranged in the assembly hole 4113. After long-term use, the positioning member 413 is worn, which easily leads to a small deviation in the limit of the positive electrode collector 110; the positioning member 413 is detachably connected to the first pressure head 411, which can facilitate the maintenance and replacement of the positioning member 413, avoid the need to replace the first pressure head 411 as a whole, and improve the maintenance economy. For example, the positioning member 413 can be detachably connected to the first pressure head 411 by means of threaded connection, clamping, etc., and the present disclosure does not limit this.

[0079] like Fig.15 As shown, the positioning member 413 may include a mounting portion 4131, an elastic portion 4132 and a positioning portion 4133. The mounting portion 4131 is located in the assembly hole 4113 and is fixedly connected to the first pressure head 411. The positioning portion 4133 is elastically connected to the mounting portion 4131 through the elastic portion 4132. The positioning portion 4133 can be located at an extended position extending out of the assembly hole 4113 and a recovered position retracted into the assembly hole 4113 through the elastic portion 4132. When the positioning portion 4133 is in the extended position, it is used to be located in the notch 113 at the edge of the positive current collecting disk 110; the positioning portion 4133 can be located in the notch 113 at the edge of the positive current collecting disk 110 when it is in the extended position; the positioning portion 4133 can be located in the notch 113 at the edge of the positive current collecting disk 110 when it is compressed and squeezed. In the hole 4113, for example, when aligning the positive current collecting disc 110 with the first pressure head 411, when the protrusion 111 of the positive current collecting disc 110 is located in the positioning hole 4111 of the first pressure head 411 and the notch 113 of the current collecting disc has not yet been aligned with the notch 113 of the positive current collecting disc 110, the positive current collecting disc 110 squeezes the positioning portion 4133 back into the assembly hole 4113, and when the positioning portion 4133 is aligned with the notch 113 by rotating the positive current collecting disc 110, the positioning portion 4133 extends into the notch 113 through the elastic restoring force of the elastic portion 4132 to achieve angular positioning of the positive current collecting disc 110.

[0080] The elastic part 4132 may be, for example, a spring, which is light in weight and has a relatively linear compression ratio. Of course, the elastic part 4132 may also be made of a material with good compression performance, such as rubber, and the present disclosure does not impose any limitation on this.

[0081] The mounting portion 4131 is fixed in the assembly hole 4113 , and the positioning portion 4133 can be extended and retracted in the assembly hole 4113 . The sizes of the assembly hole 4113 and the positioning portion 4133 match so that the assembly hole 4113 forms a guide for the extension and retraction of the positioning portion 4133 .

[0082] Among them, a step structure can be formed on the positioning portion 4133, and a step structure can be matched to be formed in the assembly hole 4113 to form a limit for the positioning portion 4133 to move toward the extended position in the assembly hole 4113, thereby preventing the positioning portion 4133 from escaping from the assembly hole 4113.

[0083] In one embodiment, the first pressing head 411 includes a second surface opposite to the first surface, and the positioning hole 4111 passes through the first surface and the second surface of the first pressing head 411; Fig.13 , Fig.14 , Fig.16 and Fig.17 As shown, a negative pressure assembly 412 is provided on the first pressing head 411, and the negative pressure assembly 412 includes a vacuum nozzle 4123, and the vacuum nozzle 4123 extends from the second surface of the first pressing head 411 into the positioning hole 4111 to form a negative pressure at the opening of the positioning hole 4111 on the first surface. By providing the negative pressure assembly 412, the positive electrode collector disc 110 can be adsorbed on the first surface of the first pressing head 411. For example, when the welding device vibrates, the positive electrode collector disc 110 is firmly adsorbed and will not easily move or fall off, thereby improving the reliability of the first pressing head 411 fixing the positive electrode collector disc 110.

[0084] The negative pressure assembly 412 further includes a fixing portion 4121 , the fixing portion 4121 is fixedly connected to the first pressure head 411 , and the vacuum nozzle 4123 is connected to the fixing portion 4121 .

[0085] Among them, Fig.16 and Fig.17 As shown, the fixing portion 4121 is provided with a first fixing hole 4122. Fig.13 As shown, the first pressing head 411 is provided with a second fixing hole 4116 , and the fixing portion 4121 is fixedly connected to the first pressing head 411 via a pin or a screw provided in the first fixing hole 4122 and the second fixing hole 4116 .

[0086] The vacuum nozzle 4123 is provided with a negative pressure interface 4124 and a negative pressure hole 4125 . The negative pressure interface 4124 is used to connect a negative pressure device. The negative pressure device draws air from the negative pressure interface 4124 to form a negative pressure in the negative pressure hole 4125 to adsorb the positive electrode current collecting plate 110 .

[0087] Among them, Fig.17 As shown, abutment portion 4126 is provided in the negative pressure hole 4125 of the vacuum nozzle 4123, and the abutment portion 4126 is used to abut against the protrusion 111 of the positive current collecting disc 110. The abutment portion 4126 can also be a switch member of the negative pressure assembly 412. For example, when the positive current collecting disc 110 is mounted on the first pressure head 411, the protrusion 111 of the positive current collecting disc 110 extends into the positioning hole 4111 to squeeze the abutment portion 4126. After being squeezed, the abutment portion 4126 retracts toward the negative pressure hole 4125, and the negative pressure hole 4125 is opened by the retraction of the abutment portion 4126, so that negative pressure is formed at the negative pressure hole 4125 to adsorb the positive current collecting disc 110; when the positive current collecting disc 110 is not arranged on the first pressure head 411, the abutment portion 4126 is squeezed to close the negative pressure hole 4125.

[0088] By arranging the negative pressure assembly 412 in the positioning hole 4111 of the first pressure head 411, it is avoided to open other negative pressure airflow channels on the first pressure head 411, thereby reducing the difficulty of structural design of the first pressure head 411 and reducing the production cost of the first pressure head 411.

[0089] In one embodiment, a negative pressure channel and a negative pressure opening located at the end of the negative pressure through hole are formed on the first pressure head 411, and the negative pressure opening is located on the first surface; the negative pressure opening is used to be arranged corresponding to the remaining areas other than the first welding area 112 of the positive current collector 110, so that the negative pressure provided by the negative pressure opening forms the adsorption of the positive current collector 110. By arranging multiple negative pressure openings on the first surface of the first pressure head 411 adsorbing the positive current collector 110, vacuum adsorption of different areas of the positive current collector 110 can be formed, thereby improving the adsorption capacity of the positive current collector 110.

[0090] Among them, multiple negative pressure openings can be connected to the outlet of the same negative pressure channel, and the negative pressure channel is connected to the negative pressure equipment to achieve the purpose of vacuum adsorption of the positive electrode current collecting disk 110 at the multiple negative pressure openings.

[0091] In one embodiment, Fig.12 As shown, a positioning groove 4117 recessed toward the second surface is formed on the first surface of the first pressing head 411 , and the positioning groove 4117 is used to accommodate the positive electrode current collecting plate 110 .

[0092] Among them, Figure 3 and Figure 4 As shown, the positive current collecting disc 110 is circular, and the positioning groove 4117 is also circular; the diameter of the positive current collecting disc 110 matches the diameter of the positioning groove 4117, so that when the positive current collecting disc 110 is located in the positioning groove 4117, the gap between the edge of the positive current collecting disc 110 and the groove wall of the positioning groove 4117 is relatively small.

[0093] Among them, Fig.12 As shown, the positioning hole 4111 is formed in the central area of ​​the positioning groove 4117. The protrusion 111 of the positive current collecting disc 110 is usually located in the center of the positive current collecting disc 110, and the positioning hole 4111 is located in the central area of ​​the positioning groove 4117, which facilitates the positioning of the positive current collecting disc 110 on the first pressing head 411.

[0094] The diameter of at least a portion of the positioning hole 4111 decreases from one end of the first surface toward the other end. By forming at least a tapered shape at the opening of the positioning hole 4111, when the protrusion 111 of the positive electrode current collecting disk 110 extends into the positioning hole 4111, the tapered portion of the positioning hole 4111 can serve as a guide to facilitate the protrusion 111 to be located in the positioning hole 4111.

[0095] The positioning hole 4111 may be a stepped hole, and the stepped hole has a stepped surface, and the stepped surface faces the first surface. By setting the positioning hole 4111 as a stepped hole, on the one hand, when the protrusion 111 of the positive current collector 110 extends into the positioning hole 4111, the part with a larger diameter of the stepped hole serves as a guide portion, which facilitates the protrusion 111 to be located in the positioning hole 4111; on the other hand, it is convenient to cooperate with the protrusion 111 on the positive current collector 110, thereby improving the accuracy of positioning the positive current collector 110.

[0096] In one embodiment, Fig.10 As shown, a first air inlet 4115 connected to the first welding hole 4112 is also formed on the side wall of the first pressing head 411. By providing the first air inlet 4115 connected to the first welding hole 4112, during the laser welding process of the positive electrode current collecting plate 110 and the pole ear, a protective gas can be delivered to the first welding hole 4112, thereby protecting the welding point.

[0097] The shielding gas may be nitrogen, for example, which can effectively protect the weld pool, reduce or even avoid oxidation, reduce spatter generated during welding, and effectively reduce weld porosity.

[0098] The first pressing head 411 is provided with a plurality of first welding holes 4112 , and each of the first welding holes 4112 is provided with a connected first air inlet 4115 to transport a protective gas into each of the first welding holes 4112 .

[0099] like Fig. 9 and Fig.10 As shown, the first clamp 410 includes a first bottom plate 418, a first base 416 arranged on the first bottom plate 418 through a support column and a fixing plate, a first pressure head 411 is arranged above the first base 416, and the first base 416 is formed with a fixing groove, which supports the second end of the limited battery cell 120 through the fixing groove.

[0100] The first pressing head 411 is provided with a first mounting hole 4114 , and can be fixedly mounted on the first fixing seat 415 through the first pressing plate 414 and a screw member. The first fixing seat 415 can be fixedly disposed on the first bottom plate 418 through a supporting member.

[0101] The distance between the first pressing head 411 and the first base 416 is adjustable, so as to facilitate the placement of the battery cell 120 before welding and the removal of the battery cell 120 after welding. For example, the first fixing seat 415 can be moved up and down by a driving assembly; or, a bottom bracket that can be moved up and down is provided at the bottom of the first fixing seat 415; or, the first pressing head 411 can be moved up and down by the first fixing seat 415, and the present disclosure does not limit this.

[0102] Among them, Fig. 9 and Fig.10As shown, the first clamp 410 is further provided with a first clamp 417. When the battery cell 120 is placed through the first base 416, the first clamps 417 are provided on both sides of the main body of the battery cell 120. The first clamps 417 further fix the battery cell 120, thereby improving the stability of the battery cell 120 during the welding process.

[0103] In one embodiment, Figure 8 , Figures 18 to 20 As shown, the current collecting plate welding device 40 also includes a second clamp 420, the second clamp 420 includes a second pressing head 421 and a second fixing component, the second fixing component is configured to fix the battery cell 120, the second pressing head 421 is arranged opposite to the second fixing component, and the second pressing head 421 is configured to press the negative current collecting plate 130 onto the second end of the battery cell 120; a second welding hole 4212 is formed on the second pressing head 421, and the laser emitted by the laser welder can irradiate the second welding area 1312 of the negative current collecting plate 130 through the second welding hole 4212 to weld the negative current collecting plate 130 to the pole ear on the second end of the battery cell 120.

[0104] like Fig. 20 As shown, a positioning protrusion 4211 is provided on the side of the second pressing head 421 facing the second fixing assembly; Figure 5 and Figure 6 As shown, a positioning through hole 1311 is formed on the disk body 131 of the negative current collecting disk 130, and the positioning protrusion 4211 is configured to extend into the positioning through hole 1311 on the central portion of the disk body 131 of the negative current collecting disk 130, that is, the positioning through hole 1311 cooperates with the positioning protrusion 4211 to achieve concentricity positioning between the negative current collecting disk 130 and the second pressure head 421, thereby improving the concentricity of the alignment between the negative current collecting disk 130 and the battery cell 120.

[0105] In one embodiment, the laser welder 430 is movably disposed on a side of the first pressing head 411 away from the first fixing component and on a side of the second pressing head 421 away from the second fixing component, so that the laser emitted by the laser welder 430 can irradiate the second welding area 1312 of the negative electrode current collecting plate 130 through the second welding hole 4212 to weld the negative electrode current collecting plate 130 and the electrode ear on the second end of the battery cell 120 together.

[0106] Of course, a laser welder may be provided on one side of the first fixing assembly and on the side of the second pressing head 421 away from the second fixing assembly to laser weld the positive electrode current collecting disc 110 on the first clamp 410 and the negative electrode current collecting disc 130 on the second clamp 420, respectively, and the present disclosure does not limit this.

[0107] In one embodiment, Fig.19 and Fig. 20As shown, a negative pressure channel and a negative pressure through hole 4216 located at the end of the negative pressure through hole are formed on the second pressure head 421, and the negative pressure through hole 4216 is located on the first surface of the second pressure head 421; the second pressure head 421 is used to be arranged corresponding to the remaining areas other than the second welding area 1312 of the negative electrode current collecting disc 130, so that the negative pressure provided by the negative pressure assembly connected to the second pressure head 421 forms the adsorption of the negative electrode current collecting disc 130. By providing a plurality of negative pressure openings on the first surface of the second pressure head 421 for adsorbing the negative electrode current collecting disc 130, vacuum adsorption of different areas of the negative electrode current collecting disc 130 can be formed, thereby improving the adsorption capacity of the negative electrode current collecting disc 130.

[0108] Among them, multiple negative pressure through holes 4216 can be connected to the outlet of the same negative pressure channel, and the negative pressure channel is connected to the negative pressure equipment to achieve the purpose of vacuum adsorption of the negative electrode current collecting plate 130 at the multiple negative pressure through holes 4216.

[0109] In one embodiment, Fig.19 and Fig. 20 As shown, a second air inlet hole 4215 connected to the second welding hole 4212 is also formed on the side wall of the second pressing head 421. By providing the second air inlet hole 4215 connected to the second welding hole 4212, during the laser welding process between the second air inlet hole 4215 of the second welding hole 4212 and the electrode tab, a protective gas can be transported into the second welding hole 4212, thereby protecting the welding point.

[0110] The shielding gas may be nitrogen, for example, which can effectively protect the weld pool, reduce or even avoid oxidation, reduce spatter generated during welding, and effectively reduce weld porosity.

[0111] The second pressing head 421 is provided with a plurality of second welding holes 4212 , and each second welding hole 4212 is provided with a communicating second air inlet 4215 to transport a protective gas into each second welding hole 4212 .

[0112] like Fig.18 As shown, the second clamp 420 includes a second bottom plate 428, a second base 426 arranged on the second bottom plate 428 through a support column and a fixing plate, a second pressure head 421 is arranged above the second base 426, and the second base 426 is formed with a fixing groove, which supports the first end of the limited battery cell 120 through the fixing groove.

[0113] Among them, Fig.19 and Fig. 20 As shown, the second pressing head 421 is provided with a second mounting hole 4214 , and can be fixedly mounted on the second fixing seat 425 through a second pressing plate 424 and a screw member, and the second fixing seat 425 can be fixedly disposed on the second bottom plate 428 through a supporting member.

[0114] The distance between the second pressing head 421 and the second base 426 is adjustable, so as to facilitate the placement of the battery cell 120 before welding and the removal of the battery cell 120 after welding. For example, the second fixing seat 425 can be moved up and down by a driving assembly; or, a bottom bracket that can be moved up and down is provided at the bottom of the second fixing seat 425; or, the second pressing head 421 can be moved up and down by the second fixing seat 425, and the present disclosure does not limit this.

[0115] Among them, Fig.18 As shown, the second clamp 420 is further provided with a second clamp 427. When the battery cell 120 is placed through the second base 426, the second clamps 427 are provided on both sides of the main body of the battery cell 120. The second clamps 427 further fix the battery cell 120, thereby improving the stability of the battery cell 120 during the welding process.

[0116] like Fig. 20 As shown, a first surface of the second pressure head 421 is also formed with an avoidance groove 4213, and the second pressure head 421 absorbs Figure 5 and Figure 6 When the negative electrode current collecting disc 130 is positioned, one end of the connecting portion 132 of the negative electrode current collecting disc 130 connecting the disc body 131 is located in the avoidance groove 4213, forming a circumferential angle positioning of the negative electrode current collecting disc 130 on the second pressure head 421, avoiding the angular deviation of the negative electrode current collecting disc 130 after the circumferential angle positioning, further improving the positioning effect of the negative electrode current collecting disc 130, and improving the welding effect of the negative electrode current collecting disc 130 and the pole ear.

[0117] Among them, a negative pressure adsorption component for adsorbing the end cover unit 140 can also be set on the second clamp 420, and the end cover unit 140 connected to the negative electrode current collecting plate 130 can be vacuum adsorbed by the negative pressure adsorption component, so that the end cover unit 140 and the negative electrode current collecting plate 130 are at the same horizontal height, thereby improving the horizontality of the negative electrode current collecting plate 130, thereby improving the welding effect of the negative electrode current collecting plate 130 and the electrode ear.

[0118] It should be noted that the present disclosure provides Figure 3 and Figure 4 The positive electrode current collecting plate 110 is described in detail as an example of a current collecting plate electrically connected to a positively charged battery housing. Of course, Figure 3 and Figure 4 The positive electrode current collector 110 shown can also be used as a negative electrode current collector electrically connected to the negatively charged battery housing; Figure 5 and Figure 6 The negative electrode current collecting plate 130 is described in detail as an example of a current collecting plate electrically connected to the negatively charged end cap unit 140. Of course, Figure 5 and Figure 6The negative electrode current collecting plate 130 shown can of course also be used as a positive electrode current collecting plate electrically connected to the positively charged end cap unit 140 , and the present disclosure does not limit this.

[0119] like Figure 8 As shown, the first clamp 410 and the second clamp 420 are respectively installed on the workbench 450 through the positive electrode welding tooling slide rail 441 and the negative electrode welding tooling slide rail 442. A laser welder 430 is also installed on the workbench 450 through a bracket. The laser welder 430 can be moved through the track on the bracket to be located above the first pressing head 411 to perform laser welding operations through the first welding hole 4112, or to be located above the second pressing head 421 to perform laser welding operations through the second welding hole 4212.

[0120] like Figure 7 As shown, the first fixture 410 , the second fixture 420 and the laser welder 430 assembled on the workbench 450 are arranged in the accommodation space formed by the protective cover 460 to protect the first fixture 410 , the second fixture 420 and the laser welder 430 .

[0121] The collecting plate welding device 40 is also provided with a control terminal 470, and the control terminal 470 includes a display panel and an operation panel to control and monitor the welding device, so as to facilitate the use of the welding device.

[0122] The collecting plate welding device 40 is also provided with a wiring tube 480, through which the electrical connection lines and signal lines of the electrical components in the welding device can be led out, thus avoiding messy wiring and improving the overall integration of the welding device.

[0123] In the application embodiments, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the application embodiments can be understood according to the specific circumstances.

[0124] In the description of the application embodiments, it should be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the application embodiments and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the application embodiments.

[0125] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application embodiment. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0126] The above are only preferred embodiments of the application embodiments and are not intended to limit the application embodiments. For those skilled in the art, the application embodiments may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application embodiments shall be included in the protection scope of the application embodiments.

Claims

1. A current collecting plate welding device, characterized in that: include: a first clamp, the first clamp comprising a first pressing head and a first fixing assembly, the first fixing assembly being configured to fix the battery cell, the first pressing head being arranged opposite to the first fixing assembly, the first pressing head being configured to press the first current collecting disk onto the first end of the battery cell; a positioning hole and a first welding hole being formed on a first surface of the first pressing head facing the first fixing assembly, the positioning hole being configured to accommodate a protrusion on a central portion of the first current collecting disk; A laser welder is arranged on a side of the first pressure head away from the first fixing assembly, and the laser emitted by the laser welder can irradiate the welding area of ​​the first current collecting disk through the first welding hole to weld the first current collecting disk to the tab on the first end of the battery cell.

2. The current collecting plate welding device according to claim 1, characterized in that: The first fixture further comprises: A positioning member is arranged on the first surface of the first pressure head. When the protrusion of the first collecting disk is located in the positioning hole of the first pressure head, the positioning member is configured to be located in the notch at the edge of the first collecting disk to form a limit for the circumferential rotation of the first collecting disk.

3. The current collecting plate welding device according to claim 2, characterized in that: The positioning member is detachably connected to the first pressing head.

4. The current collecting plate welding device according to claim 2, characterized in that: The first pressure head is provided with an assembly hole, and the positioning member includes a mounting portion, an elastic portion and a positioning portion. The mounting portion is located in the assembly hole and is fixedly connected to the first pressure head, and the elastic portion connects the mounting portion and the positioning portion. The positioning portion can be located at an extended position extending out of the assembly hole and a recovered position retracted into the assembly hole through the elastic portion. When the positioning portion is in the extended position, it is configured to be located in the notch at the edge of the first collecting plate.

5. The current collecting plate welding device according to claim 1, characterized in that: The first pressing head includes a second surface opposite to the first surface, and the positioning hole passes through the first surface and the second surface of the first pressing head.

6. The current collecting plate welding device according to claim 5, characterized in that: The collector plate welding device further comprises: A negative pressure assembly includes a vacuum nozzle, wherein the vacuum nozzle extends from the second surface of the first pressure head into the positioning hole to form a negative pressure at an opening of the positioning hole located on the first surface.

7. The current collecting plate welding device according to claim 1, characterized in that: A negative pressure channel and a negative pressure hole communicating with the negative pressure channel are formed on the first pressure head, and the negative pressure hole is located on the first surface.

8. The current collecting plate welding device according to claim 1, characterized in that: A positioning groove is formed on the first surface of the first pressure head, and the positioning groove is configured to accommodate the first collecting plate.

9. The current collecting plate welding device according to claim 8, characterized in that: The positioning hole is located at the center of the positioning groove.

10. The current collecting plate welding device according to claim 1, characterized in that: The diameter of at least a portion of the positioning hole decreases from one end located on the first surface toward the other end.

11. The current collecting plate welding device according to claim 1, characterized in that: The positioning hole is a stepped hole having a stepped surface, and the stepped surface faces the first fixing component.

12. The current collecting plate welding device according to claim 1, characterized in that: The first fixing assembly includes a first base and a first clamping jaw. A fixing groove is formed on the first base. The fixing groove is configured to place a battery cell. The first clamping jaw is configured to clamp the battery cell placed in the fixing groove.

13. The current collecting plate welding device according to claim 1, characterized in that: The collector plate welding device further comprises: The second clamp includes a second pressing head and a second fixing component, the second fixing component is configured to fix the battery cell, the second pressing head is arranged opposite to the second fixing component, and the second pressing head is configured to press the second collecting plate onto the second end of the battery cell; a second welding hole is formed on the second pressing head.

14. The current collecting plate welding device according to claim 13, characterized in that: A positioning protrusion is provided on a surface of the second pressure head facing the second fixing assembly, and the positioning protrusion is configured to extend into a positioning through hole on the central portion of the second current collecting plate.

15. The current collecting plate welding device according to claim 13, characterized in that: The laser welder is movably disposed on a side of the first pressing head away from the first fixing component and on a side of the second pressing head away from the second fixing component, so that the laser emitted by the laser welder can irradiate the welding area of ​​the second current collecting plate through the second welding hole to weld the second current collecting plate to the tab on the second end of the battery cell.

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