Manufacturing method of welding fixture, welding equipment and battery production line

Abstract

The invention discloses a manufacturing method of a welding fixture, welding equipment and a battery production line, and the manufacturing method comprises the steps that a plurality of fixture models and a current collecting component model are created according to the type of a current collecting component, each fixture model is provided with a welding hole through which a welding laser passes, and in the plurality of fixture models, the welding laser passes through the welding hole; the shapes of the welding holes of the at least clamp models are different, the multiple clamp models are subjected to an optimization test to obtain a target model, the welding holes of the target model are circular, and when the target model is fixed to the current collecting component model, the current collecting component model has redundancy around the target model, and the target model is fixed to the current collecting component model. And according to the fact that the target model meets the checking condition, the target model is determined as a clamp machining model, and the welding clamp is machined according to the clamp machining model. Due to the fact that the welding hole of the welding clamp is round, welding slag can be conveniently cleaned out of the welding hole, the situation of welding residues is reduced, and the cleaning effect of the welding slag in the welding hole is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a manufacturing method of a welding fixture, welding equipment and a battery production line. Background Art

[0002] With the development of new energy, more and more fields are using new energy as a power source. Due to its advantages such as high energy density, rechargeable, safe and environmentally friendly, battery devices are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields.

[0003] The battery device includes a battery cell, which includes an electrode assembly, a transfer plate, a shell and an end cap. The electrode assembly is arranged in the shell, and the end cap closes the opening of the shell. The transfer plate is arranged in the shell and electrically connects the electrode assembly and the electrode terminal on the end cap. The transfer plate and the electrode terminal are fixed by welding. During the welding process, a welding fixture is required to fix the transfer plate and the electrode terminal. The welding laser passes through the welding hole on the welding fixture to weld the transfer plate and the electrode terminal.

[0004] In the related art, when the welding fixture is used for welding, the cleaning effect of the welding slag in the welding hole is poor, and the welding slag is easily left on the adapter, which increases the process risk and also increases the risk of adhesion between the welding fixture and the adapter. Summary of the invention

[0005] In view of the above problems, the present application provides a manufacturing method of a welding fixture, welding equipment and a battery production line, which solve the problem of poor cleaning effect of welding slag in the welding hole of the welding fixture during welding.

[0006] The first aspect of the present application provides a method for manufacturing a welding fixture, wherein the welding fixture is used to fix a current collecting member of a battery cell when manufacturing a battery cell. The method for manufacturing the welding fixture includes: Creating a plurality of fixture models according to the type of the current collecting component, wherein each fixture model has a welding hole for a welding laser to pass through, wherein shapes of the welding holes of at least any two fixture models among the plurality of fixture models are different; Creating models of the current collecting component, wherein the number of the models of the current collecting component is consistent with the number of the fixture models; Conducting optimization tests on multiple fixture models to obtain a target model, wherein the welding hole of the target model is circular, and when the target model is fixed on the model of the current collecting component, the model of the current collecting component has redundancy around the target model; The welding fixture is processed according to the target model.

[0007] According to the welding fixture manufacturing method of the present application, when in use, the welding fixture is against the current collecting component, and the current collecting component is against the electrode terminal, and the current collecting component is fixed on the electrode terminal by the welding fixture to achieve positioning welding of the current collecting component, so that the welding accuracy is improved. During welding, the welding laser passes through the welding hole of the welding fixture and welds the current collecting component to the electrode terminal. Since the welding hole of the welding fixture is set to be circular, it is convenient to clean the welding slag out of the welding hole during the cleaning process of the welding slag, reducing the situation of welding residue and improving the cleaning effect of the welding slag in the welding hole, thereby reducing the process risk and the risk of adhesion between the welding fixture and the current collecting component.

[0008] In some embodiments of the present application, in the step of creating a plurality of fixture models according to the type of the current collecting component, wherein each fixture model has a welding hole for the welding laser to pass through, wherein the shapes of the welding holes of at least any two fixture models in the plurality of fixture models are different, the step includes: Determining the shape of the welding groove on the current collecting component; According to the shapes of the welding grooves, a plurality of jig models are created, wherein when the jig models are fixed on the model of the current collecting member, all the welding grooves can be covered by the welding holes of the jig models.

[0009] A fixture model is created according to the current collecting component so that the fixture model can be effectively adapted to the current collecting component, thereby determining a fixture processing model among multiple fixture models, and further enabling the welding fixture manufactured according to the fixture processing model to effectively meet the needs of production use.

[0010] In some embodiments of the present application, a plurality of fixture models are created according to the shape of the welding groove, wherein when the fixture model is fixed on the model of the current collecting member, the welding groove can be covered by the welding hole of the fixture model, including: Select materials for multiple fixture models; According to the selected material, a plurality of blank models of the fixture models are created, wherein when the fixture model is fixed on the model of the current collecting component, the redundancy between the edges of the blank model and the model of the current collecting component is in the range of 0 mm to 4 mm; Set the shapes of multiple welding holes; A plurality of fixture models are created in an orthogonal manner according to the margins of the blank model and the model of the current collecting member and the shapes of the plurality of welding holes.

[0011] Such an arrangement can provide a plurality of fixture models of different specifications, so as to provide more samples for the confirmation of the target model, so that the determined target model can meet the design requirements.

[0012] In some embodiments of the present application, in the step of performing an optimization test on a plurality of fixture models to obtain a target model, wherein the welding hole of the target model is circular, and when the target model is fixed on the model of the current collecting component, the model of the current collecting component has redundancy around the target model, the step includes: Creating models of the current collecting component, wherein the number of the models of the current collecting component is consistent with the number of the fixture models; Abutting the fixture model against the models of the current collecting components one by one, wherein the welding groove on each model of the current collecting component is arranged in the welding hole of the fixture model; Simulating welding of models of multiple current collecting components; According to the welding data, the target model is determined.

[0013] The fixture model is fixed to the model of the current collecting component by means of simulated welding, and the target model is determined by welding data, thereby shortening the design time of the welding fixture and improving the manufacturing efficiency of the welding fixture.

[0014] In some embodiments of the present application, the step of determining the target model according to the welding data includes: Acquire welding data, wherein the welding data includes welding penetration, deformation of the fixture model, and residual metal particles after welding; According to the maximum welding penetration, the deformation of the fixture model being 0 mm and the minimum amount of residual metal particles after welding, a fixture model that meets the conditions is screened out from multiple fixture models, and the fixture model that meets the conditions is determined as the target model.

[0015] The target type is determined by the welding penetration, the deformation of the fixture model, and the residual metal particles after welding, so that the target model can effectively meet the design requirements, and then the welding fixture produced according to the target model can effectively meet the production use requirements.

[0016] In some embodiments of the present application, in the step of screening out a qualified fixture model from multiple fixture models based on the maximum welding penetration, the deformation of the fixture model being 0 mm and the minimum amount of residual metal particles after welding, and determining the qualified fixture model as the target model, when the target model is fixed on the model of the current collecting component, the diameter of the welding hole is a first length, and the maximum size of the welding groove of the current collecting component is a second length, wherein the first length is greater than or equal to the sum of the second length and the first coefficient, and the first coefficient is greater than 0.

[0017] Such an arrangement enables the welding holes on the target model to effectively accommodate the welding grooves of the current collector, so that the welding fixture processed according to the target model can effectively meet the production requirements.

[0018] In some embodiments of the present application, the first coefficient is in the range of 1 mm to 3 mm. Such a setting enables the welding fixture processed according to the target model to form a redundancy on the circumferential outer side of the welding groove of the current collecting component when welding the current collecting component, so as to improve the welding effect of the current collecting component.

[0019] In some embodiments of the present application, in the step of selecting a fixture model that meets the conditions from multiple fixture models according to the maximum welding penetration, the deformation amount of the fixture model being 0 mm, and the minimum amount of metal particles remaining after welding, and determining the fixture model that meets the conditions as the target model, When the target model is fixed on the model of the current collecting component, along the first direction, the minimum distance between the first side of the welding hole and the edge of the target model is the first distance, and the minimum distance between the second side of the welding hole and the edge of the target model is the second distance, and the first direction is the width direction of the current collecting component; Along the first direction, the distance between the welding groove of the current collecting component on the first side and the edge of the current collecting component is a third distance, and the distance between the welding groove of the current collecting component on the second side and the edge of the current collecting component is a fourth distance, wherein the third distance is greater than the sum of the first distance and the second coefficient, the fourth distance is greater than the sum of the second distance and the third coefficient, and both the first coefficient and the second coefficient are greater than 0.

[0020] Such an arrangement enables the welding fixture processed according to the target model to have redundancy on the outer side of the welding fixture along the first direction when welding the current collecting component, so that the welding fixture can fully contact the current collecting component, thereby improving the pressing and positioning of the welding fixture on the current collecting component, and further improving the welding effect of the current collecting component.

[0021] In some embodiments of the present application, the second coefficient is in the range of 1 mm to 3 mm.

[0022] Such an arrangement enables the welding fixture processed according to the target model to form a redundancy on the first side of the welding fixture when welding the current collecting component, so as to improve the welding effect of the current collecting component.

[0023] In some embodiments of the present application, the third coefficient is in the range of 1 mm to 3 mm.

[0024] Such an arrangement enables the welding fixture processed according to the target model to form a redundancy on the second side of the welding fixture when welding the current collecting component, so as to improve the welding effect of the current collecting component.

[0025] In some embodiments of the present application, in the step of selecting a fixture model that meets the conditions from multiple fixture models according to the maximum welding penetration, the deformation amount of the fixture model being 0 mm, and the minimum amount of metal particles remaining after welding, and determining the fixture model that meets the conditions as the target model, When the target model is fixed on the model of the current collecting component, along the second direction, the minimum distance between the third side of the welding hole and the edge of the target model is the first dimension, and the second direction is the length direction of the current collecting component; Along the second direction, a distance between the welding groove of the current collecting member at the third side and the edge of the current collecting member is a second size, wherein the second size is greater than a sum of the first size and a fourth coefficient, and the fourth coefficient is greater than zero.

[0026] Such an arrangement enables the welding fixture processed according to the target model to have redundancy on the outer side of the welding fixture along the second direction when welding the current collecting component, so that the welding fixture can fully contact the current collecting component, thereby improving the pressing and positioning of the welding fixture on the current collecting component, and further improving the welding effect of the current collecting component.

[0027] In some embodiments of the present application, the fourth coefficient is in the range of 1 mm to 3 mm.

[0028] Such an arrangement enables the welding fixture processed according to the target model to form a redundancy on the second side of the welding fixture when welding the current collecting component, so as to improve the welding effect of the current collecting component.

[0029] In some embodiments of the present application, the step of processing the welding fixture according to the target model includes: Processing a fixture sample according to the target model; Obtaining structural parameters of the fixture sample, the structural parameters at least including surface cracks, surface flatness and surface burrs; Based on the surface cracks, surface flatness and surface burrs meeting the set requirements, the fixture sample is determined to be a welding fixture.

[0030] Such an arrangement can realize the review of the fixture samples, reduce the number of fixture samples with defects, thereby improving the manufacturing accuracy of the welding fixture, and further improving the welding effect of the current collecting component using the welding fixture.

[0031] In some embodiments of the present application, the requirements are set as surface cracks of 0, surface flatness greater than or equal to 0 mm and less than or equal to 0.05 mm, and surface burrs of 0.

[0032] Such an arrangement can effectively screen out fixture samples that do not meet the design requirements, further improve the manufacturing accuracy of the welding fixture, and thus improve the welding effect of the current collecting component using the welding fixture.

[0033] In some embodiments of the present application, in the step of processing the welding fixture according to the target model, the welding fixture is processed by chip cutting, stamping, 3D printing or injection molding. Such a setting can make the processing flexibility of the welding fixture stronger, thereby effectively meeting the needs of production and manufacturing.

[0034] A second aspect of the present application provides a welding device, which includes a welding fixture, and the welding fixture is a welding fixture manufactured according to the above manufacturing method of the welding fixture.

[0035] When the welding fixture of the present application is used, the welding fixture abuts against the current collecting component, and the current collecting component abuts against the electrode terminal. The current collecting component is fixed on the electrode terminal by the welding fixture to achieve positioning welding of the current collecting component, so that the welding accuracy is improved. During welding, the welding laser passes through the welding hole of the welding fixture and welds and fixes the current collecting component on the electrode terminal. Since the welding hole of the welding fixture is set to be circular, it is convenient to clean the welding slag out of the welding hole during the cleaning process of the welding slag, reducing the situation of welding residue and improving the cleaning effect of the welding slag in the welding hole, thereby reducing the process risk and the risk of adhesion between the welding fixture and the current collecting component.

[0036] A third aspect of the present application provides a battery production line, which includes the welding device as described above.

[0037] When the welding device of the present application is used, the welding fixture is against the current collecting component, and the current collecting component is against the electrode terminal, and the current collecting component is fixed on the electrode terminal by the welding fixture to achieve positioning welding of the current collecting component, so that the welding accuracy is improved. During welding, the welding laser passes through the welding hole of the welding fixture and welds and fixes the current collecting component on the electrode terminal. Since the welding hole of the welding fixture is set to be circular, it is convenient to clean the welding slag out of the welding hole during the cleaning process of the welding slag, reducing the situation of welding residue and improving the cleaning effect of the welding slag in the welding hole, thereby reducing the process risk and the risk of adhesion between the welding fixture and the current collecting component.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The structure diagram of a welding fixture according to one embodiment of the present application is schematically shown; Figure 2 for Figure 1A schematic diagram of the structure of the welding fixture shown in FIG. 1 when used to weld a current collecting component; Figure 3 for Figure 2 A schematic structural diagram of another perspective of the structure shown in FIG. Figure 4 The flowchart of a method for manufacturing a welding fixture according to an embodiment of the present application is schematically shown.

[0040] The reference numerals are as follows: 10. Welding fixture; 11. welding hole; 12. first side; 13. second side; 14. third side; 20. Current collecting components; 21. Welding groove; X, first direction; Y, second direction; a1, first distance; a2, second distance; a3, third distance; a4, fourth distance; b1, first length; b2, second length; c1, first size; c2, second size. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0043] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0044] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0046] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0047] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. 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 embodiments of the present application 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 a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "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, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding.

[0050] In the related art, the adapter and electrode terminal of the battery cell are fixed by welding. During the welding process, a welding fixture is needed to fix the adapter and the electrode terminal. The welding laser passes through the welding hole on the welding fixture to weld the adapter and the electrode terminal. When the welding fixture is welding, the cleaning effect of the welding slag in the welding hole is poor, and the welding slag is easily left on the adapter, which increases the process risk and the risk of adhesion between the welding fixture and the adapter.

[0051] The present application proposes a method for manufacturing a welding fixture. When manufacturing the welding fixture, multiple fixture models are created according to the type of current collecting components, wherein each fixture model has a welding hole for a welding laser to pass through, wherein, among the multiple fixture models, the shapes of the welding holes of at least any two fixture models are different, and a model of the current collecting component is created, wherein the number of models of the current collecting component is consistent with the number of fixture models, and multiple fixture models are subjected to optimization tests to obtain a target model, wherein the welding hole of the target model is circular, and when the target model is fixed on the model of the current collecting component, the model of the current collecting component has redundancy around the target model, and the welding fixture is processed according to the target model. When welding is performed on the welding fixture manufactured by the manufacturing method of the welding fixture mentioned above, the welding laser passes through the welding hole of the welding fixture and welds the current collecting component to the electrode terminal. Since the welding hole of the welding fixture is set to be circular, the welding slag is easily cleaned out of the welding hole during the welding slag cleaning process, which reduces the welding residue and improves the cleaning effect of the welding slag in the welding hole, thereby reducing the process risk and the risk of adhesion between the welding fixture and the current collecting component.

[0052] The technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0053] For example, this is a schematic diagram of the structure of a vehicle according to one embodiment of the present application. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor, a controller and a battery device may be arranged inside the vehicle, and the controller is used to control the battery device to power the motor. For example, a battery device may be arranged at the bottom, front or rear of the vehicle. The battery device may be used to power the vehicle. For example, the battery device may be used as an operating power source for the vehicle and for the circuit system of the vehicle, for example, for the working power requirements during the start-up, navigation and operation of the vehicle. In another embodiment of the present application, the battery device may not only be used as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0054] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0055] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0056] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0057] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0058] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0059] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0060] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0061] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0062] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0063] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0064] In some embodiments of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0065] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0066] In some embodiments of the present application, a battery cell includes a shell, a pressure relief mechanism, an electrode assembly and an insulating member, the shell includes a plurality of side walls, the plurality of side walls include a first side wall, a pressure relief mechanism is provided on the first side wall, the pressure relief mechanism is configured to open or close according to whether the internal pressure of the shell reaches a pressure threshold, the electrode assembly is arranged inside the shell, the insulating member is arranged inside the shell and between the shell and the electrode assembly, and is used to insulate and isolate the shell and the electrode assembly, and the insulating member abuts against the electrode assembly.

[0067] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0068] The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0069] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0070] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0071] As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium or silver, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0072] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05O2) and at least one of its modified compounds. The modified compound refers to a substance obtained by modifying the above substances by means of doping or coating.

[0073] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a foamed nickel, a foamed copper, a foamed aluminum, a foamed alloy, or a foamed carbon. When the foamed metal is used as the positive electrode, the positive electrode active material may not be disposed on the surface of the foamed metal, but of course, the positive electrode active material may also be disposed. As an example, the positive electrode active material is filled or / and deposited in the foamed metal.

[0074] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0075] As an example, the negative electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium or silver, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0076] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0077] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0078] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0079] In some embodiments, the negative electrode may be a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the negative electrode sheet, the surface of the foam metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

[0080] As an example, a negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0081] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0082] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0083] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0084] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator.

[0085] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0086] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0087] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0088] In some embodiments, the electrode assembly is a laminate structure.

[0089] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0090] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0091] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0092] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0093] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0094] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0095] In some embodiments, the electrode sheet of the electrode assembly is provided with a tab, which can lead current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0096] In some embodiments, a pressure relief mechanism is provided on the housing, and the pressure relief mechanism is used to discharge the internal gas of the battery cell.

[0097] As an example, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode sheet, negative electrode sheet, electrolyte and separator in the battery cell.

[0098] As an example, the pressure relief mechanism may be integrally formed with the housing.

[0099] As an example, the pressure relief mechanism may also be separately provided and connected to the housing.

[0100] The "actuation" mentioned in this application means that the pressure relief mechanism is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The action produced by the pressure relief mechanism may include but is not limited to: the components in the pressure relief mechanism move to form an exhaust channel, at least a part of the pressure relief mechanism ruptures, breaks, is torn or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged from the actuated part as emissions. In this way, the battery cell can be depressurized and cooled under controllable pressure or temperature, thereby reducing the potential for more serious accidents.

[0101] In some embodiments, when the outer shell is a non-sealed structure, the pressure relief mechanism can be set as a through hole to discharge the gas inside the battery cell.

[0102] The emissions from the battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of separators, high-temperature and high-pressure gases produced by the reaction, flames, and the like.

[0103] The positive electrode tab and the negative electrode tab can be led out from the same end of the electrode sheet, or can be led out from opposite ends of the electrode sheet respectively.

[0104] The structures of the positive electrode tab and the negative electrode tab may be the same or different. Taking the positive electrode tab as an example, the positive electrode tab may include multiple positive electrode tab layers, and multiple positive electrode tab layers are stacked together to form the positive electrode tab. The positive electrode tab may include at least two parts, one part is located between the main body of the pole piece and the insulating member, and the other part is located between the insulating member and the electrode lead-out member.

[0105] The insulating member can insulate at least part of the pole ear from the end face of the main body, thereby reducing the risk of the pole ear being inserted into the main body when the battery cell is affected by external impact, vibration, etc., thereby reducing the risk of short circuit in the battery cell and helping to improve the reliability of the battery cell.

[0106] The insulating member may be an integral structure or a split structure. As an example, the insulating member is formed by connecting a plurality of independently formed parts. As another example, the insulating member is integrally formed by stamping.

[0107] For example, the insulating part is a plastic part, and the insulating part which is a plastic part is integrally formed by injection molding. The processing of the plastic part is convenient, and the manufacturing cost of the plastic part is low.

[0108] In some embodiments of the present application, the housing includes a shell and an end cover, the shell has an opening, the end cover is connected to the shell and closes the opening, the end cover constitutes a first side wall, and the pressure relief mechanism is arranged on the end cover.

[0109] In some embodiments of the present application, the shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film, etc. In some embodiments, the shell may be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0110] In addition, the connection methods between the end cover and the shell include but are not limited to snap connection, bonding, welding or connection via a connector.

[0111] In some embodiments of the present application, the battery cell further includes an electrode terminal, which is disposed on the end cap and electrically connected to the electrode assembly. The electrode terminal is electrically connected to the pole tab of the electrode assembly. The electrode terminal may be directly connected to the pole tab or indirectly connected to the pole tab through a current collecting member. The electrode terminal may be disposed on the end cap or on the housing. In the embodiments shown in the present application, the electrode terminal is disposed on the end cap.

[0112] In some embodiments of the present application, the current collecting member may be a sheet structure, and a welding groove is provided on the surface of the current collecting member. When the electrode terminal is indirectly connected to the electrode tab through the current collecting member, the electrode terminal and the welding groove of the current collecting member are arranged opposite to each other and fixed by laser welding.

[0113] In addition, the material of the current collecting member includes but is not limited to aluminum, copper or other alloy materials.

[0114] like Figures 1 to 4 As shown, in some embodiments of the present application, a method for manufacturing a welding fixture 10 is proposed, wherein the welding fixture 10 manufactured by the manufacturing method is used to fix the current collecting member 20 of the battery cell when manufacturing the battery cell, and the manufacturing method of the welding fixture 10 includes: S10: creating a plurality of fixture models according to the type of the current collecting member 20, wherein each fixture model has a welding hole 11 for a welding laser to pass through, wherein among the plurality of fixture models, shapes of the welding holes 11 of at least any two fixture models are different.

[0115] Specifically, in the manufacturing process of the welding fixture 10, the welding fixture 10 needs to be designed first, and the welding fixture 10 is modeled during the design to form a fixture model. A plurality of fixture models are created, wherein each fixture model is of a different type, so that a fixture model that meets the needs can be selected from a plurality of fixture models of different types.

[0116] By creating multiple fixture models, the number of samples in the design process of the welding fixture 10 can be increased, and then a fixture model that meets the design can be selected from multiple fixture models through testing, so that a welding fixture 10 that meets production needs can be manufactured using the fixture model that meets the design.

[0117] It should be pointed out that the fixture model includes multiple parameters, such as the thickness, length, width or shape of the welding hole 11 of the fixture model. When welding the current collecting component 20, the welding fixture 10 is against the current collecting component 20, and the welding hole 11 of the welding fixture 10 is arranged in the circumference of the welding groove 21 of the current collecting component 20. When the welding laser welds the current collecting component 20, the generated welding slag will be received by the welding hole 11, and the shape of the welding hole 11 directly affects the cleaning of the welding slag. Therefore, in the present application, among the multiple fixture models, the shapes of the welding holes 11 of any two fixture models are different, and the welding holes 11 that meet the type of the current collecting component 20 can be screened out in turn, so that the manufactured welding fixture 10 is conducive to the cleaning of welding slag, so as to reduce the occurrence of welding slag affecting the welding quality.

[0118] In addition, among multiple fixture models, the shapes of the welding holes 11 of any two fixture models are different, that is, the shape of each welding hole 11 is different. For example, the shapes of the welding holes 11 in multiple fixture models can be circular, elliptical, triangular, quadrilateral, pentagonal, hexagonal, etc.

[0119] The shapes of the outer contours of the multiple fixture models can be completely the same, partially the same, or completely different. The shapes of the outer contours of the multiple fixture models can be circular, elliptical, triangular, quadrilateral, pentagonal, hexagonal, etc. During the use of the welding fixture 10, the shape of its outer contour has little effect on the cleaning of welding slag. Based on this, for the convenience of design, in this application, the shapes of the outer contours of the multiple fixture models are set to be the same, and in order to effectively adapt to the current collecting component 20, the shapes of the multiple fixture models are set to be squares, and rounded chamfer structures are set at the corners of the outer contours.

[0120] In addition, the creation of the fixture model can be done by manually making a physical sample or by modeling with computer software. In the present application, the creation of the fixture model is achieved by modeling with computer software, which can shorten the design time and effectively reduce the manufacturing cost of the welding fixture 10.

[0121] In some embodiments of the present application, the step S10 includes: S11 : determining the shape of the welding groove 21 on the current collecting member 20 .

[0122] Specifically, the current collecting member 20 is adapted according to the structure of the battery cell, that is, the current collecting member 20 includes multiple types, and therefore, the welding jig 10 needs to be adapted to the type of the current collecting member 20 .

[0123] Among them, the welding groove 21 on the current collecting component 20 is one of the features adapted to the structure of the battery cell, and during welding, the welding hole 11 of the welding fixture 10 is arranged on the outer peripheral side of the welding groove 21. Therefore, when creating the fixture model, it is necessary to consider the shape of the welding groove 21 on the current collecting component 20, so that the manufactured welding fixture 10 can meet the production usage requirements.

[0124] S12 : creating a plurality of jig models according to the shape of the welding groove 21 , wherein when the jig models are fixed on the model of the current collecting member 20 , all of the welding groove 21 can be covered by the welding holes 11 of the jig models.

[0125] Specifically, after determining the shape of the welding groove 21 of the current collecting component 20, a fixture model is created. During the creation process, it is necessary to ensure that when the fixture model is fixed on the model of the current collecting component 20, the entire welding groove 21 can be covered by the welding hole 11 of the fixture model, so that the fixture model can be effectively adapted to the current collecting component 20, thereby determining the fixture processing model among multiple fixture models, and then the welding fixture 10 manufactured according to the fixture processing model can effectively meet the needs of production use.

[0126] In some embodiments of the present application, the step S12 includes: S121: Select materials of multiple fixture models.

[0127] Specifically, the material of the welding fixture 10 also has an impact on the welding process of the current collector. Based on this, in the design process of the welding fixture 10, the material is also considered as an influencing factor.

[0128] The material of the welding fixture 10 includes but is not limited to metal or non-metal, and the material of the welding fixture 10 needs to meet the requirements of strength and thermal stability.

[0129] In the present application, the welding fixture 10 is a metal component or a component coated with ceramic material on a metal part, so that the welding fixture 10 has good structural strength, so that the welding fixture 10 can effectively position the current collecting component 20. At the same time, it can also make the welding fixture 10 have good temperature resistance, reducing the deformation of the welding fixture 10 caused by welding heat.

[0130] S122 : creating a plurality of blank models of the jig models according to the selected material, wherein when the jig models are fixed on the model of the current collecting member 20 , the margin between the blank model and the model of the current collecting member 20 is in the range of 0 mm to 4 mm.

[0131] Specifically, a blank model is created using the selected material, and the number of blank models is multiple, wherein the size of the blank model needs to be set. The state in which the fixture model is fixed on the model of the current collecting member 20 is used as a reference. In this state, the blank model of the fixture model has a projection on the model of the current collecting member 20, and the projection is within the range of the current collecting member 20.

[0132] Among them, the redundancy refers to the minimum distance between the edge of the blank model and the edge of the current collecting component 20. When the redundancy is 0 mm, the edge of the blank model is flush with the edge of the current collecting component 20. When the redundancy is not 0 mm, there is a distance between the edge of the blank model and the edge of the current collecting component 20. The distance can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm.

[0133] S123: Setting the shapes of the plurality of welding holes 11.

[0134] Specifically, in order to obtain an optimal design of the welding fixture 10 , it is necessary to set a range of shapes of the welding holes 11 , for example, the set range includes a circle, an ellipse, a triangle, a quadrilateral, a pentagon and a hexagon.

[0135] S124 : creating a plurality of jig models in an orthogonal manner according to the margins of the blank model and the model of the current collecting member 20 and the shapes of the plurality of welding holes 11 .

[0136] Specifically, the redundancy of the edges of the blank model and the model of the current collecting component 20 and the shapes of the multiple welding holes 11 are two variables in the design process. By setting the two variables in an orthogonal test manner, multiple fixture models of different specifications can be provided to provide more samples for confirming the target model so that the determined target model can meet the design requirements.

[0137] S20: creating models of the current collecting member 20, wherein the number of the models of the current collecting member 20 is consistent with the number of the fixture models.

[0138] It should be understood that the model of the current collecting member 20 is modeled according to the current collecting member 20 to be welded, so that the welding jig 10 can effectively adapt to the current collecting member 20 .

[0139] S30: performing optimization tests on multiple fixture models to obtain a target model, wherein the welding hole 11 of the target model is circular, and when the target model is fixed on the model of the current collecting component 20, the model of the current collecting component 20 has redundancy around the target model.

[0140] Specifically, during the design process of the welding fixture 10, it is necessary to select the best fixture model from multiple fixture models as the target model, and manufacture the welding fixture 10 according to the target model. The target model is obtained through optimization experiments.

[0141] In some implementations of the present application, step S30 includes: S31 : The jig model is brought into contact with the models of the current collecting member 20 one by one, wherein the welding groove 21 on each model of the current collecting member 20 is disposed in the welding hole 11 of the jig model.

[0142] Specifically, the fixture model is set to correspond one to one with the model of the current collecting component 20, and each fixture model is made to abut against a model of the current collecting component 20, and at the same time, the welding groove 21 on the model of the current collecting component 20 is accommodated in the welding hole 11 of the fixture model, so that the model of the current collecting component 20 can be welded, and then through further settings, multiple fixture models are screened to obtain the target model.

[0143] S32: Simulate welding of the models of the plurality of current collecting members 20 .

[0144] Specifically, simulation welding is performed on the models of the current collecting members 20 respectively, and the clamp model is screened using the welding data to obtain a target clamp.

[0145] It should be understood that in the present application, the model of the fixture and the model of the current collecting component 20 are both formed by computer software modeling. Based on this, the model of the current collecting component 20 is simulated by welding through computer software, thereby shortening the design time and design cost of the welding fixture 10.

[0146] S33: Determine the target model according to the welding data.

[0147] Specifically, the welding fixture 10 fixes the current collecting member 20 during the welding process of the current collecting member 20 . Therefore, the method of screening multiple fixture models based on welding data is more accurate, thereby improving the accuracy of obtaining the target model.

[0148] Based on steps S31 to S33 , the fixture model is fixed to the model of the current collecting member 20 by means of simulated welding, and the target model is determined by welding data, thereby shortening the design time of the welding fixture 10 and improving the manufacturing efficiency of the welding fixture 10 .

[0149] In some implementations of the present application, step S24 includes: S331: Acquire welding data, wherein the welding data includes welding penetration, deformation of the fixture model, and residual metal particles after welding.

[0150] Specifically, during the welding process of the current collecting component 20, the criteria for evaluating the welding effect of the current collecting component 20 are generally reflected in aspects such as welding penetration, deformation of the fixture model, and residual metal particles after welding. Based on this, in the present application, welding penetration, deformation of the fixture model, and residual metal particles after welding are used as the basis for screening multiple fixture models to further improve accuracy.

[0151] S332: According to the maximum welding penetration, the deformation of the fixture model being 0 mm, and the minimum amount of residual metal particles after welding, a fixture model that meets the conditions is screened out from multiple fixture models, and the fixture model that meets the conditions is determined as a target model.

[0152] Specifically, the target type is determined by the welding penetration, the deformation of the fixture model, and the residual metal particles after welding, so that the target model can effectively meet the design requirements, and the welding fixture 10 produced according to the target model can effectively meet the production use requirements.

[0153] In some embodiments of the present application, Figure 3 As shown, in step S332, when the target model is fixed on the model of the current collecting component 20, the diameter of the welding hole 11 is the first length b1, and the maximum size of the welding groove 21 of the current collecting component 20 is the second length b2, wherein the first length b1 is greater than or equal to the sum of the second length b2 and the first coefficient, and the first coefficient is greater than 0. In this way, the welding hole 11 on the target model can effectively accommodate the welding groove 21 of the current collecting component, so that the welding fixture 10 processed according to the target model can effectively meet the production needs.

[0154] It should be noted that the first coefficient may be an integer or a decimal. For example, the unit of the first coefficient is millimeter, and the value may be 0.5 millimeter, 1.5 millimeter, 2.5 millimeter, 3.5 millimeter, 4.5 millimeter, 5.5 millimeter, or 6.5 millimeter.

[0155] In some embodiments of the present application, the first coefficient is in the range of 1 mm to 3 mm. In this way, when the welding fixture 10 processed according to the target model is used to weld the current collecting component 20, a redundancy is formed on the circumferential outer side of the welding groove 21 of the current collecting component 20, so as to improve the welding effect of the current collecting component 20.

[0156] It should be noted that the value of the first coefficient can be 1 mm, 2 mm, or 3 mm.

[0157] In some embodiments of the present application, Figure 3As shown, in step S332, when the target model is fixed on the model of the current collecting component 20, along the first direction X, the minimum distance between the first side 12 of the welding hole 11 and the edge of the target model is a first distance a1, and the minimum distance between the second side 13 of the welding hole 11 and the edge of the target model is a second distance a2, and the first direction X is the width direction of the current collecting component.

[0158] Along the first direction X, the distance between the welding groove 21 of the current collecting member 20 on the first side 12 and the edge of the current collecting member 20 is a third distance a3, and the distance between the welding groove 21 of the current collecting member 20 on the second side 13 and the edge of the current collecting member 20 is a fourth distance a4, wherein the third distance a3 is greater than the sum of the first distance a1 and the second coefficient, the fourth distance a4 is greater than the sum of the second distance a2 and the third coefficient, and both the first coefficient and the second coefficient are greater than 0.

[0159] Such an arrangement enables the welding fixture 10 processed according to the target model to have redundancy on the outer side of the welding fixture 10 along the first direction X when welding the current collecting component 20, so that the welding fixture 10 can fully contact the current collecting component 20, thereby improving the pressing and positioning of the welding fixture 10 on the current collecting component 20, and further improving the welding effect of the current collecting component 20.

[0160] It should be noted that the second coefficient may be an integer or a decimal. For example, the unit of the second coefficient is millimeter, and the value may be 0.5 millimeter, 1.5 millimeter, 2.5 millimeter, 3.5 millimeter, 4.5 millimeter, 5.5 millimeter, or 6.5 millimeter.

[0161] In some embodiments of the present application, the second coefficient is in the range of 1 mm to 3 mm. In this way, when the welding fixture 10 processed according to the target model is used to weld the current collecting component 20, a redundancy is formed on the first side 12 of the welding fixture 10, so as to improve the welding effect of the current collecting component 20.

[0162] It should be noted that the value of the second coefficient can be 1 mm, 2 mm, or 3 mm.

[0163] In some embodiments of the present application, the third coefficient is in the range of 1 mm to 3 mm.

[0164] Such an arrangement enables the welding fixture 10 processed according to the target model to form a redundancy on the second side 13 of the welding fixture 10 when welding the current collecting component 20 , so as to improve the welding effect of the current collecting component 20 .

[0165] It should be noted that the value of the third coefficient can be 1 mm, 2 mm, or 3 mm.

[0166] In some embodiments of the present application, Figure 3 As shown, in step S332, when the target model is fixed on the model of the current collecting member 20, the minimum distance between the third side 14 of the welding hole 11 and the edge of the target model along the second direction Y is the first dimension c1, and the second direction Y is the length direction of the current collecting member. Along the second direction Y, the distance between the third side 14 of the welding groove 21 of the current collecting member 20 and the edge of the current collecting member 20 is the second dimension c2, wherein the second dimension c2 is greater than the sum of the first dimension c1 and the fourth coefficient, and the fourth coefficient is greater than 0.

[0167] Such an arrangement enables the welding fixture 10 processed according to the target model to have redundancy on the outer side of the welding fixture 10 along the second direction Y when welding the current collecting component 20, so that the welding fixture 10 can fully contact the current collecting component 20, thereby improving the pressing and positioning of the welding fixture 10 on the current collecting component 20, and further improving the welding effect of the current collecting component 20.

[0168] In some embodiments of the present application, the fourth coefficient is in the range of 1 mm to 3 mm.

[0169] It should be noted that the value of the fourth coefficient can be 1 mm, 2 mm, or 3 mm.

[0170] S40: Processing the welding fixture 10 according to the target model.

[0171] Specifically, a target model is selected from multiple fixture models through optimization experiments, and the structural parameters of the target model are used as parameters for manufacturing the welding fixture 10, thereby improving the manufacturing accuracy of the welding fixture 10, so that the manufactured welding fixture 10 can reduce welding residues and improve the cleaning effect of welding slag in the welding hole 11, thereby reducing process risks and the risk of adhesion between the welding fixture 10 and the current collecting component 20.

[0172] In some embodiments of the present application, the step S30 includes: S41: Process the fixture sample according to the target model.

[0173] S42: Obtaining structural parameters of the fixture sample, the structural parameters at least include surface cracks, surface flatness and surface burrs. Specifically, among the structural parameters of the fixture sample, surface cracks, surface flatness and surface burrs directly affect the influence of the welding fixture 10 on the welding effect during use. Therefore, by using surface cracks, surface flatness and surface burrs as screening conditions, the manufactured fixture samples are selected, thereby effectively improving the manufacturing accuracy of the welding fixture 10.

[0174] S43: According to whether the surface cracks, surface flatness and surface burrs meet the set requirements, the fixture sample is determined as the welding fixture 10. In this way, the fixture sample can be reviewed, and the number of fixture samples with defects is reduced, thereby improving the manufacturing accuracy of the welding fixture 10, and further improving the welding effect of the current collecting component 20 using the welding fixture 10.

[0175] It should be understood that in the present application, the requirements are set as surface cracks of 0, surface flatness greater than or equal to 0 mm and less than or equal to 0.05 mm, and surface burrs of 0. This setting can effectively screen out fixture samples that do not meet the design requirements, further improve the manufacturing accuracy of the welding fixture 10, and further improve the welding effect of the current collecting component 20 using the welding fixture 10.

[0176] In addition, in the step of processing the welding fixture 10, the processing method of the welding fixture 10 is chip cutting, stamping, 3D printing or injection molding. Such a setting can make the processing flexibility of the welding fixture 10 stronger, thereby effectively meeting the needs of production and manufacturing.

[0177] According to the manufacturing method of the welding fixture 10 of the present application, when the welding fixture 10 is used, the welding fixture 10 is against the current collecting member 20, and the current collecting member 20 is against the electrode terminal. The current collecting member 20 is fixed on the electrode terminal by the welding fixture 10 to achieve the positioning welding of the current collecting member 20, so that the welding precision is improved. During welding, the welding laser passes through the welding hole 11 of the welding fixture 10 and welds and fixes the current collecting member 20 on the electrode terminal. Since the welding hole 11 of the welding fixture 10 is set to be circular, it is convenient to clean the welding slag out of the welding hole 11 during the cleaning process of the welding slag, reducing the situation of welding residue, improving the cleaning effect of the welding slag in the welding hole 11, thereby reducing the process risk and the risk of adhesion between the welding fixture 10 and the current collecting member 20.

[0178] A second aspect of the present application provides a welding device, which includes a welding fixture 10 . The welding fixture 10 is a welding fixture 10 manufactured according to the above manufacturing method of the welding fixture 10 .

[0179] When the welding fixture 10 of the present application is used, the welding fixture 10 is pressed against the current collecting member 20, and the current collecting member 20 is pressed against the electrode terminal. The current collecting member 20 is fixed on the electrode terminal by the welding fixture 10 to achieve the positioning welding of the current collecting member 20, so that the welding precision is improved. During welding, the welding laser passes through the welding hole 11 of the welding fixture 10 and welds and fixes the current collecting member 20 on the electrode terminal. Since the welding hole 11 of the welding fixture 10 is set to be circular, it is convenient to clean the welding slag out of the welding hole 11 during the cleaning process of the welding slag, reducing the situation of welding residue, improving the cleaning effect of the welding slag in the welding hole 11, thereby reducing the process risk and the risk of adhesion between the welding fixture 10 and the current collecting member 20.

[0180] A third aspect of the present application provides a battery production line, which includes the welding device as described above.

[0181] When the welding device of the present application is in use, the welding fixture 10 is against the current collecting member 20, and the current collecting member 20 is against the electrode terminal, and the current collecting member 20 is fixed on the electrode terminal by the welding fixture 10 to achieve positioning welding of the current collecting member 20, so that the welding precision is improved. During welding, the welding laser passes through the welding hole 11 of the welding fixture 10 and welds and fixes the current collecting member 20 on the electrode terminal. Since the welding hole 11 of the welding fixture 10 is set to be circular, during the process of cleaning the welding slag, it is convenient to clean the welding slag out of the welding hole 11, reducing the situation of welding residue, improving the cleaning effect of the welding slag in the welding hole 11, thereby reducing the process risk and the risk of adhesion between the welding fixture 10 and the current collecting member 20.

[0182] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

[0183] In the implementation mode of the present application, Figures 1 to 4 As shown, the present application proposes a method for manufacturing a welding fixture 10, the welding fixture 10 is used to fix a current collecting member 20 of a battery cell when manufacturing a battery cell, and the method for manufacturing the welding fixture 10 includes: S10: creating a plurality of fixture models according to the type of the current collecting member 20 , wherein each fixture model has a welding hole 11 for the welding laser to pass through, wherein at least the shape of the welding hole 11 of each fixture model is different among the plurality of fixture models.

[0184] The shape of the welding groove 21 on the current collecting member 20 is determined, and a plurality of fixture models are created according to the shape of the welding groove 21, wherein when the fixture model is fixed on the model of the current collecting member 20, the entirety of the welding groove 21 can be covered by the welding hole 11 of the fixture model. The materials of the plurality of fixture models are selected, and a plurality of blank models of the fixture models are created according to the selected materials, wherein when the fixture model is fixed on the model of the current collecting member 20, the redundancy between the blank model and the edge of the model of the current collecting member 20 is in the range of 0 mm to 4 mm, and the shapes of the plurality of welding holes 11 are set, and a plurality of fixture models are created in an orthogonal manner according to the redundancy between the blank model and the edge of the model of the current collecting member 20 and the shapes of the plurality of welding holes 11.

[0185] S20: creating models of the current collecting member 20, wherein the number of the models of the current collecting member 20 is consistent with the number of the fixture models.

[0186] S30: performing optimization tests on multiple fixture models to obtain a target model, wherein the welding hole 11 of the target model is circular, and when the target model is fixed on the model of the current collecting component 20, the model of the current collecting component 20 has redundancy around the target model.

[0187] Creating models of the current collecting member 20 , wherein the number of the models of the current collecting member 20 is consistent with the number of the fixture models; The fixture model is brought into contact with the models of the current collecting component 20 one by one, wherein the welding groove 21 on each model of the current collecting component 20 is arranged in the welding hole 11 of the fixture model; Simulating welding of multiple models of current collecting components 20; Determine the target model according to the welding data. The welding data is obtained, wherein the welding data includes welding penetration, deformation of the fixture model, and residual metal particles after welding; According to the maximum welding penetration, the deformation of the fixture model is 0 mm, and the residual amount of metal particles after welding is the least, a fixture model that meets the conditions is screened out from multiple fixture models, and the fixture model that meets the conditions is determined as the target model. When the target model is fixed on the model of the current collecting member 20, the diameter of the welding hole 11 is the first length b1, and the maximum size of the welding groove 21 of the current collecting member 20 is the second length b2, wherein the first length b1 is greater than or equal to the sum of the second length b2 and the first coefficient, and the first coefficient is 1 mm. When the target model is fixed on the model of the current collecting component 20, along the first direction X, the minimum distance between the first side 12 of the welding hole 11 and the edge of the target model is the first distance a1, and the minimum distance between the second side 13 of the welding hole 11 and the edge of the target model is the second distance a2. The first direction X is the width direction of the current collecting component. Along the first direction X, the distance between the first side 12 of the welding groove 21 of the current collecting component 20 and the edge of the current collecting component 20 is the third distance a3, and the distance between the second side 13 of the welding groove 21 of the current collecting component 20 and the edge of the current collecting component 20 is the fourth distance a4, wherein the third distance a3 is greater than the sum of the first distance a1 and the second coefficient, the fourth distance a4 is greater than the sum of the second distance a2 and the third coefficient, and the first coefficient and the second coefficient are both 1. When the target model is fixed on the model of the current collecting component 20, along the second direction Y, the minimum distance between the third side 14 of the welding hole 11 and the edge of the target model is the first dimension c1, the second direction Y is the length direction of the current collecting component, and along the second direction Y, the distance between the welding groove 21 of the current collecting component 20 on the third side 14 and the edge of the current collecting component 20 is the second dimension c2, wherein the second dimension c2 is greater than the sum of the first dimension c1 and the fourth coefficient, and the fourth coefficient is 1.

[0188] S40: Processing the welding fixture 10 according to the target model.

[0189] A fixture sample is processed according to the target model, and structural parameters of the fixture sample are obtained, the structural parameters at least including surface cracks, surface flatness and surface burrs, and the fixture sample is determined as a welding fixture 10 according to the surface cracks, surface flatness and surface burrs meeting the set requirements. The setting needs to be that the surface cracks of the fixture sample are 0, the surface flatness of the fixture sample is greater than or equal to 0 mm and less than or equal to 0.05 mm, and the surface burrs of the fixture sample are 0. The processing method of the welding fixture 10 is chip cutting, stamping, 3D printing or injection molding.

[0190] According to the manufacturing method of the welding fixture 10 of the present application, when the welding fixture 10 is used, the welding fixture 10 is against the current collecting member 20, and the current collecting member 20 is against the electrode terminal. The current collecting member 20 is fixed on the electrode terminal by the welding fixture 10 to achieve the positioning welding of the current collecting member 20, so that the welding precision is improved. During welding, the welding laser passes through the welding hole 11 of the welding fixture 10 and welds and fixes the current collecting member 20 on the electrode terminal. Since the welding hole 11 of the welding fixture 10 is set to be circular, it is convenient to clean the welding slag out of the welding hole 11 during the cleaning process of the welding slag, reducing the situation of welding residue, improving the cleaning effect of the welding slag in the welding hole 11, thereby reducing the process risk and the risk of adhesion between the welding fixture 10 and the current collecting member 20.

[0191] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for manufacturing a welding fixture, wherein the welding fixture is used to fix a current collecting member of a battery cell when manufacturing the battery cell, characterized in that: The manufacturing method of the welding fixture comprises: According to the type of the current collecting component, a plurality of fixture models are created, wherein each of the fixture models has a welding hole for a welding laser to pass through, wherein among the plurality of fixture models, shapes of the welding holes of at least any two of the fixture models are different; Creating models of current collecting components, wherein the number of the models of the current collecting components is consistent with the number of the fixture models; Performing an optimization test on the multiple fixture models to obtain a target model, wherein the welding hole of the target model is circular, and when the target model is fixed on the model of the current collecting component, the model of the current collecting component has redundancy around the target model; The welding fixture is processed according to the target model.

2. The method for manufacturing a welding fixture according to claim 1, wherein: In the step of creating a plurality of fixture models according to the type of the current collecting component, wherein each of the fixture models has a welding hole for a welding laser to pass through, wherein the shapes of the welding holes of at least any two of the fixture models are different, the method comprises: Determining the shape of the welding groove on the current collecting component; The plurality of jig models are created according to the shapes of the welding grooves, wherein when the jig models are fixed on the model of the current collecting member, all of the welding grooves can be covered by the welding holes of the jig models.

3. The method for manufacturing a welding fixture according to claim 2, characterized in that: The step of creating the plurality of fixture models according to the shape of the welding groove, wherein when the fixture model is fixed on the model of the current collecting member, the welding groove can be covered by the welding hole of the fixture model, comprises: selecting materials for the plurality of fixture models; According to the selected material, a blank model of the plurality of fixture models is created, wherein when the fixture model is fixed on the model of the current collecting member, the redundancy between the edges of the blank model and the model of the current collecting member is in a range of 0 mm to 4 mm; Setting the shapes of the plurality of welding holes; The plurality of jig models are created in an orthogonal manner according to the margins of the blank model and the model of the current collecting member and the shapes of the plurality of welding holes.

4. The method for manufacturing a welding fixture according to claim 1, wherein: In the step of performing an optimization test on the plurality of fixture models to obtain a target model, wherein the welding hole of the target model is circular, and when the target model is fixed on the model of the current collecting component, the model of the current collecting component has redundancy around the target model, the step includes: Abutting the fixture model against the models of the current collecting components one by one, wherein the welding groove on each model of the current collecting component is arranged in the welding hole of the fixture model; Simulating welding of a plurality of models of the current collecting components; The target model is determined according to the welding data.

5. The method for manufacturing a welding fixture according to claim 4, characterized in that: The step of determining the target model according to the welding data includes: Acquiring the welding data, wherein the welding data includes welding penetration, deformation of the fixture model, and residual metal particles after welding; According to the maximum welding penetration, the deformation of the fixture model being 0 mm and the minimum amount of residual metal particles after welding, the fixture model that meets the conditions is screened out from the multiple fixture models, and the fixture model that meets the conditions is determined as the target model.

6. The method for manufacturing a welding fixture according to claim 5, characterized in that: In the step of screening out the fixture model that meets the conditions from the multiple fixture models based on the maximum welding penetration, the deformation of the fixture model being 0 mm and the minimum amount of residual metal particles after welding, and determining the fixture model that meets the conditions as the target model, when the target model is fixed on the model of the current collecting component, the diameter of the welding hole is a first length, and the maximum size of the welding groove of the current collecting component is a second length, wherein the first length is greater than or equal to the sum of the second length and a first coefficient, and the first coefficient is greater than 0.

7. The method for manufacturing a welding jig according to claim 6, wherein: The first coefficient is in the range of 1 mm to 3 mm.

8. The method for manufacturing a welding jig according to claim 6, wherein: In the step of selecting the fixture model that meets the conditions from the multiple fixture models according to the maximum welding penetration, the deformation of the fixture model being 0 mm, and the minimum amount of metal particles remaining after welding, and determining the fixture model that meets the conditions as the target model, When the target model is fixed on the model of the current collecting component, along the first direction, the minimum distance between the first side of the welding hole and the edge of the target model is the first distance, and the minimum distance between the second side of the welding hole and the edge of the target model is the second distance, and the first direction is the width direction of the current collecting component; Along the first direction, the distance between the welding groove of the current collecting component on the first side and the edge of the current collecting component is a third distance, and the distance between the welding groove of the current collecting component on the second side and the edge of the current collecting component is a fourth distance, wherein the third distance is greater than the sum of the first distance and the second coefficient, the fourth distance is greater than the sum of the second distance and the third coefficient, and the first coefficient and the second coefficient are both greater than 0.

9. The method for manufacturing a welding jig according to claim 8, characterized in that: The second coefficient is in the range of 1 mm to 3 mm; And / or, the third coefficient is in the range of 1 mm to 3 mm.

10. The method for manufacturing a welding jig according to claim 5, characterized in that: In the step of selecting the fixture model that meets the conditions from the multiple fixture models according to the maximum welding penetration, the deformation of the fixture model being 0 mm, and the minimum amount of metal particles remaining after welding, and determining the fixture model that meets the conditions as the target model, When the target model is fixed on the model of the current collecting component, along the second direction, the minimum distance between the third side of the welding hole and the edge of the target model is a first dimension, and the second direction is the length direction of the current collecting component; Along the second direction, a distance between the third side and the edge of the current collecting member of the welding groove of the current collecting member is a second size, wherein the second size is greater than the sum of the first size and a fourth coefficient, and the fourth coefficient is greater than zero.

11. The method for manufacturing a welding jig according to claim 10, wherein: The fourth coefficient is in the range of 1 mm to 3 mm.

12. The method for manufacturing a welding jig according to claim 1, wherein: The step of processing the welding fixture according to the target model includes: Processing a fixture sample according to the target model; Acquiring structural parameters of the fixture sample, wherein the structural parameters at least include surface cracks, surface flatness, and surface burrs; According to the surface cracks, the surface flatness and the surface burrs meeting the set requirements, the fixture sample is determined as the welding fixture.

13. The method for manufacturing a welding jig according to claim 12, wherein: The setting requirements are that the surface cracks are 0, the surface flatness is greater than or equal to 0 mm and less than or equal to 0.05 mm, and the surface burrs are 0.

14. The method for manufacturing a welding jig according to any one of claims 1 to 13, characterized in that: In the step of machining the welding fixture according to the target model, the welding fixture is machined by cutting, stamping, 3D printing or injection molding.

15. A welding device, characterized in that: The welding equipment includes a welding jig, and the welding jig is a welding jig manufactured according to the manufacturing method of a welding jig according to any one of claims 1 to 14.

16. A battery production line, characterized in that: The battery production line comprises the welding apparatus according to claim 15 .

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