Manufacturing Method of Welding Fixture, Welding Equipment and Battery Production Line

Abstract

The present application discloses a manufacturing method of a welding fixture, a welding device and a battery production line. The manufacturing method includes: creating a plurality of fixture models and a model of a current collector member according to the type of the current collector member, wherein each fixture model has a welding hole through which welding laser passes, and among the plurality of fixture models, at least the shapes of the welding holes of each fixture model are different; 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 model of the current collector member is fixed on the target model, there is a redundant amount around the model of the current collector member in the target model; determining the target model as a fixture processing model according to the target model meeting the verification conditions; and machining a welding fixture according to the fixture processing model. 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, reducing the situation of welding residues and improving the cleaning effect of the welding slag in the welding hole.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and particularly to a manufacturing method of a welding fixture, a welding device, and a battery production line. Background Art

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

[0003] The battery device includes battery cells. Each battery cell includes an electrode assembly, a connecting piece, a housing, and an end cover. The electrode assembly is disposed in the housing, the end cover closes the opening of the housing, and the connecting piece is disposed in the housing and electrically connects the electrode assembly and the electrode terminal on the end cover. The connecting piece and the electrode terminal are fixed by welding. During the welding process, a welding fixture is required to fix the connecting piece and the electrode terminal. The welding laser passes through the welding hole on the welding fixture and then welds the connecting piece and the electrode terminal.

[0004] In the related art, during welding of the welding fixture, the cleaning effect of the welding slag in the welding hole is poor, and it is easy to leave welding slag on the connecting piece, increasing the process risk and the risk of adhesion between the welding fixture and the connecting piece. Summary of the Invention

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

[0006] The first aspect of the present application proposes a manufacturing method of a welding fixture. The welding fixture is used to fix the current collector member of the battery cell during the manufacture of the battery cell. The manufacturing method of the welding fixture includes:

[0007] According to the type of the current collector member, create a plurality of fixture models, wherein each fixture model has a welding hole for the welding laser to pass through, and among the plurality of fixture models, the shapes of the welding holes of at least any two fixture models are different;

[0008] Create a model of the current collector member, wherein the number of models of the current collector member is the same as the number of fixture models;

[0009] Perform 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 collector member, there is a redundant amount around the model of the current collector member in the target model;

[0010] Machine the welding fixture according to the target model.

[0011] The welding jig manufactured by the manufacturing method of the welding jig according to the present application, when in use, the welding jig abuts against the current collector member, and the current collector member abuts against the electrode terminal. The current collector member is fixed on the electrode terminal by using the welding jig to achieve the positioning welding of the current collector member, so as to improve the welding accuracy. During welding, the welding laser passes through the welding hole of the welding jig and welds and fixes the current collector member on the electrode terminal. Since the welding hole of the welding jig is set to be circular, during the slag cleaning process, it is convenient for the slag to be cleaned out of the welding hole, reducing the situation of welding residues, improving the cleaning effect of the slag in the welding hole, thereby reducing the process risk and the risk of adhesion between the welding jig and the current collector member.

[0012] In some embodiments of the present application, in the step of creating a plurality of fixture models according to the type of the current collector member, wherein each fixture model has a welding hole for the welding laser to pass through, and among the plurality of fixture models, at least any two fixture models have different shapes of welding holes, it includes:

[0013] Determine the shape of the welding groove on the current collector member;

[0014] Create a 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 collector member, all the welding grooves can be covered by the welding holes of the fixture model.

[0015] Create a fixture model according to the current collector member so that the fixture model can be effectively adapted to the current collector member, thereby determining the fixture processing model among the plurality of fixture models, and further enabling the welding jig processed and manufactured according to the fixture processing model to effectively meet the production and use requirements.

[0016] In some embodiments of the present application, in the step of creating a 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 collector member, the welding groove can be covered by the welding holes of the fixture model, it includes:

[0017] Select the materials of a plurality of fixture models;

[0018] Create a blank model of a plurality of fixture models according to the selected materials, wherein when the fixture model is fixed on the model of the current collector member, the redundancy between the edge of the blank model and the model of the current collector member is in the range of 0 mm to 4 mm;

[0019] Set the shapes of a plurality of welding holes;

[0020] Create a plurality of fixture models in an orthogonal manner according to the redundancy between the edge of the blank model and the model of the current collector member and the shapes of a plurality of welding holes.

[0021] With such settings, multiple fixture models with different specifications can be provided to offer more samples for the confirmation of the target model, so that the determined target model can meet the design requirements.

[0022] In some embodiments of the present application, when optimizing multiple fixture models to obtain a target model, where the welding holes of the target model are circular and there is a redundant amount around the target model when the target model is fixed on the model of the current collector component, the steps include:

[0023] Create a model of the current collector component, where the number of models of the current collector component is the same as the number of fixture models;

[0024] Abut each fixture model against the model of the current collector component one by one, where the welding grooves on each model of the current collector component are arranged within the welding holes of the fixture model;

[0025] Perform simulation welding on multiple models of the current collector component;

[0026] Determine the target model based on the welding data.

[0027] Fix the fixture model on the model of the current collector component by means of simulation welding and determine the target model through the welding data, thereby being able to shorten the design duration of the welding fixture and improve the manufacturing efficiency of the welding fixture.

[0028] In some embodiments of the present application, in the step of determining the target model based on the welding data, it includes:

[0029] Obtain the welding data, where the welding data includes the welding penetration depth, the deformation amount of the fixture model, and the residual amount of metal particles after welding;

[0030] Based on the maximum welding penetration depth, the deformation amount of the fixture model being 0 mm, and the least residual amount of metal particles after welding, screen out the fixture models that meet the conditions among multiple fixture models and determine the fixture models that meet the conditions as the target model.

[0031] The target type determined by the welding penetration depth, the deformation amount of the fixture model, and the residual amount of metal particles after welding enables the target model to effectively meet the design requirements, and further enables the welding fixture produced according to the target model to effectively meet the usage requirements of production.

[0032] In some embodiments of the present application, in the step of screening out eligible fixture models from multiple fixture models according to the maximum welding penetration depth, the deformation amount of the fixture model being 0 mm, and the minimum residual amount of metal particles after welding, and determining the eligible fixture model as the target model, when the target model fixes the model of the current collector component, the diameter of the welding hole is the first length, and the maximum size of the welding groove of the current collector component is the second length, where 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.

[0033] With such a setting, the welding hole on the target model can effectively accommodate the welding groove of the current collector component, so that the welding fixture processed according to the target model can effectively meet the production requirements.

[0034] In some embodiments of the present application, the first coefficient is in the range of 1 mm to 3 mm. With such a setting, when the welding fixture processed according to the target model welds the current collector component, a redundant amount can be formed on the circumferential outer side of the welding groove of the current collector component, so as to improve the welding effect of the current collector component.

[0035] In some embodiments of the present application, in the step of screening out eligible fixture models from multiple fixture models according to the maximum welding penetration depth, the deformation amount of the fixture model being 0 mm, and the minimum residual amount of metal particles after welding, and determining the eligible fixture model as the target model,

[0036] When the target model fixes the model of the current collector 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, where the first direction is the width direction of the current collector component;

[0037] Along the first direction, the distance between the first side of the welding groove of the current collector component and the edge of the current collector component is the third distance, and the distance between the second side of the welding groove of the current collector component and the edge of the current collector component is the fourth distance, where the third distance is greater than the sum of the first distance and the second coefficient, and 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.

[0038] With such a setting, when the welding fixture processed according to the target model welds the current collector component, there is a redundant amount on the outer side of the welding fixture along the first direction, so that the welding fixture can be in full contact with the current collector component, thereby improving the pressing and positioning of the welding fixture on the current collector component, and further improving the welding effect of the current collector component.

[0039] In some embodiments of the present application, the second coefficient is in the range of 1 mm to 3 mm.

[0040] With such a setting, when the welding fixture processed according to the target model is used to weld the current collector component, a redundant amount can be formed on the first side of the welding fixture, so as to improve the welding effect of the current collector component.

[0041] In some embodiments of the present application, the third coefficient is in the range of 1 mm to 3 mm.

[0042] With such a setting, when the welding fixture processed according to the target model is used to weld the current collector component, a redundant amount can be formed on the second side of the welding fixture, so as to improve the welding effect of the current collector component.

[0043] In some embodiments of the present application, in the step of screening out the qualified fixture models from multiple fixture models according to the maximum welding penetration depth, the deformation amount of the fixture model being 0 mm, and the minimum residual amount of metal particles after welding, and determining the qualified fixture model as the target model,

[0044] When fixing the target model on the model of the current collector 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 collector component;

[0045] Along the second direction, the distance between the welding groove of the current collector component and the edge of the current collector component on the third side is the second dimension, where the second dimension is greater than the sum of the first dimension and the fourth coefficient, and the fourth coefficient is greater than 0.

[0046] With such a setting, when the welding fixture processed according to the target model is used to weld the current collector component, redundant amounts are provided on the outer sides of the welding fixture along the second direction, so that the welding fixture can be in full contact with the current collector component, thereby improving the pressing and positioning of the welding fixture on the current collector component, and further improving the welding effect of the current collector component.

[0047] In some embodiments of the present application, the fourth coefficient is in the range of 1 mm to 3 mm.

[0048] With such a setting, when the welding fixture processed according to the target model is used to weld the current collector component, a redundant amount can be formed on the second side of the welding fixture, so as to improve the welding effect of the current collector component.

[0049] In some embodiments of the present application, in the step of processing the welding fixture according to the target model, it includes:

[0050] Processing a fixture sample according to the target model;

[0051] Obtaining the structural parameters of the fixture sample, and the structural parameters at least include surface cracks, surface flatness, and surface burrs;

[0052] According to the surface crack, surface flatness, and surface burr meeting the set requirements, the fixture sample is determined as a welding fixture.

[0053] With such a setting, it is possible to achieve the review of the fixture sample, reduce the defective fixture samples, thereby improving the manufacturing accuracy of the welding fixture, and further improving the welding effect of the current collector component using the welding fixture.

[0054] In some embodiments of the present application, the set requirements are that the surface crack is 0, the surface flatness is greater than or equal to 0 mm and less than or equal to 0.05 mm, and the surface burr is 0.

[0055] With such a setting, it is possible to effectively screen out the fixture samples that do not meet the design requirements, further improve the manufacturing accuracy of the welding fixture, and further improve the welding effect of the current collector component using the welding fixture.

[0056] In some embodiments of the present application, in the step of machining the welding fixture according to the target model, the machining method of the welding fixture is cutting, stamping, 3D printing, or injection molding. With such a setting, the machining flexibility of the welding fixture can be stronger, thus effectively meeting the requirements of production and manufacturing.

[0057] The second aspect of the present application proposes a welding device, which includes a welding fixture, and the welding fixture is a welding fixture manufactured according to the manufacturing method of the welding fixture as above.

[0058] When the welding fixture of the present application is in use, the welding fixture abuts against the current collector component, and makes the current collector component abut against the electrode terminal. The current collector component is fixed on the electrode terminal by using the welding fixture to achieve the positioning welding of the current collector component, so as to improve the welding accuracy. During welding, the welding laser passes through the welding hole of the welding fixture and welds and fixes the current collector component on the electrode terminal. Since the welding hole of the welding fixture is set to be circular, during the process of slag cleaning, it is convenient for the slag to be cleaned out of the welding hole, reducing the situation of welding residue, improving the cleaning effect of the slag in the welding hole, thereby reducing the process risk and the risk of adhesion between the welding fixture and the current collector component.

[0059] The third aspect of the present application proposes a battery production line, which includes the welding device as above.

[0060] When the welding equipment of the present application is in use, the welding fixture abuts against the current collector member, and the current collector member abuts against the electrode terminal. The current collector member is fixed on the electrode terminal by the welding fixture to achieve the positioning welding of the current collector member, thereby improving the welding accuracy. During welding, the welding laser passes through the welding hole of the welding fixture and welds and fixes the current collector member on the electrode terminal. Since the welding hole of the welding fixture is set to be circular, during the slag cleaning process, it is convenient to clean the slag out of the welding hole, reducing the situation of welding residue, improving the cleaning effect of the slag in the welding hole, and thus reducing the process risk and the risk of adhesion between the welding fixture and the current collector member.

[0061] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. Brief Description of the Drawings

[0062] Figure 1 Schematically shows a structural diagram of a welding fixture according to an embodiment of the present application;

[0063] Figure 2 For Figure 1 The structural diagram of the welding fixture shown in is for welding the current collector member;

[0064] Figure 3 For Figure 2 The structural diagram of another perspective of the structure shown in;

[0065] Figure 4 Schematically shows a flowchart of a manufacturing method of a welding fixture according to an embodiment of the present application.

[0066] The reference numerals are as follows:

[0067] 10. Welding fixture;

[0068] 11. Welding hole; 12. First side; 13. Second side; 14. Third side;

[0069] 20. Current collector member;

[0070] 21. Welding groove;

[0071] 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 dimension; c2. Second dimension. Detailed Description of the Embodiments

[0072] The embodiments of the technical solution of the present application will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0074] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0075] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment when it appears in various positions in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0076] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0077] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0078] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0079] In the description of the embodiments of the present application, unless otherwise clearly specified and defined, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0080] Currently, from the perspective of the development of the market situation, the application of battery devices is becoming more and more extensive. Battery devices are not only applied to energy storage power systems such as hydraulic, thermal, wind, and solar power stations, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of battery devices, the market demand is also continuously increasing.

[0081] In the related art, the adapter plate of the battery cell is fixed to the electrode terminal by welding. During the welding process, a welding fixture is required to fix the adapter plate and the electrode terminal, and the welding laser passes through the welding hole on the welding fixture to weld the adapter plate and the electrode terminal. When the welding fixture is welding, the cleaning effect of the welding slag in the welding hole is poor, and it is easy to leave the welding slag on the adapter plate, increasing the process risk and the risk of adhesion between the welding fixture and the adapter plate.

[0082] The present application proposes a manufacturing method for a welding fixture. When manufacturing the welding fixture, multiple fixture models are created according to the type of the current collector member. Each fixture model has a welding hole through which the welding laser can pass. Among the multiple fixture models, the shapes of the welding holes of at least any two fixture models are different. A model of the current collector member is created, and the number of models of the current collector member is the same as the number of fixture models. The multiple fixture models are subjected to an optimization test to obtain a target model. The welding hole of the target model is circular, and when the target model is fixed on the model of the current collector member, there is a redundant amount around the target model for the model of the current collector member. According to the target model, the welding fixture is machined. When the welding fixture manufactured by the above manufacturing method for the welding fixture is used for welding, the welding laser passes through the welding hole of the welding fixture and welds and fixes the current collector member on the electrode terminal. Since the welding hole of the welding fixture is set to be circular, during the process of slag cleaning, it is convenient for the slag to be cleaned out of the welding hole, reducing the situation of welding residue, improving the cleaning effect of the slag in the welding hole, thereby reducing the process risk and the risk of adhesion between the welding fixture and the current collector member.

[0083] The technical solutions described in the embodiments of the present application are not only limited to the above-described equipment, but can also be applied to all equipment using battery devices. For the sake of brevity of description, the following embodiments are all described by taking an electric vehicle as an example.

[0084] For example, it is a schematic structural diagram of a vehicle according to an embodiment of the present application. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A motor, a controller, and a battery device can be arranged inside the vehicle. The controller is used to control the battery device to supply power to the motor. For example, the battery device can be arranged at the bottom, the front of the vehicle, or the rear of the vehicle. The battery device can be used for power supply of the vehicle. For example, the battery device can be used as the operating power source of the vehicle and be used for the circuit system of the vehicle, such as for the working power requirements during the start, navigation, and operation of the vehicle. In another embodiment of the present application, the battery device can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0085] The battery device (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 (Battery Cell Assembly) may include multiple battery cells, and the multiple battery cells are connected in series, parallel, or in a hybrid connection through a current collecting component.

[0086] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0087] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into an independent module. As an example, the battery module can be formed by bundling multiple battery cells with cable ties.

[0088] In some embodiments, the battery device can be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0089] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0090] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing multiple battery cells to the box body.

[0091] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0092] As an example, the box body can 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.

[0093] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, a part of the box body can become at least a part of the floor of the vehicle, or a part of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0094] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0095] In some embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so as to be used continuously.

[0096] 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0097] In some embodiments of the present application, the battery cell includes a housing, a pressure relief mechanism, an electrode assembly, and an insulating member. The housing includes a plurality of side walls, and among the plurality of side walls, there is a first side wall. A pressure relief mechanism is provided on the first side wall, and the pressure relief mechanism is configured to open or close according to whether the internal pressure of the housing reaches a pressure threshold. The electrode assembly is disposed inside the housing, and the insulating member is disposed inside the housing and between the housing and the electrode assembly for insulating and isolating the housing and the electrode assembly. The insulating member abuts against the electrode assembly.

[0098] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch 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 multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc., and the present application has no special limitation.

[0099] The electrode assembly includes a positive electrode, a negative electrode, and a separator. The separator is disposed 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 extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can play a role in preventing short circuit between the positive and negative electrodes and at the same time allow active ions to pass through.

[0100] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material provided on at least one surface of the positive electrode current collector.

[0101] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is provided on any one or both of the two opposite surfaces of the positive electrode current collector.

[0102] As an example, the positive electrode current collector can be made of a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, pure metal, alloy, or metal with surface treatment can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, etc. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0103] 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 conventional materials that can be used as the positive electrode active material of the battery may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate may include but are not limited to lithium iron phosphate (such as LiFePO4 (which may also be abbreviated 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 manganese iron phosphate, and at least one of a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide 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 (which may also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which may also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which may also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which may also be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which may also be abbreviated as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O2) and their modified compounds, etc. The modified compound refers to a substance obtained by modification means such as doping or coating on the basis of the above substances.

[0104] In some embodiments, the positive electrode may adopt 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 positive electrode, the positive electrode active material may not be provided on the surface of the foam metal, and of course, the positive electrode active material may also be provided. As an example, the positive electrode active material is filled and / or deposited in the foam metal.

[0105] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0106] As an example, the negative electrode current collector may be made of a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, pure metals, alloys, or metals with surface treatment can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) on a polymer material substrate (such as substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0107] 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.

[0108] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0109] As an example, the negative electrode active material may be a 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, and lithium titanate. The silicon-based materials may be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials may be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of battery cells can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0110] In some embodiments, the negative electrode may be made of a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon. When the foam metal is used as the negative electrode sheet, the negative electrode active material may not be provided on the surface of the foam metal, or of course, the negative electrode active material may be provided.

[0111] As an example, the negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0112] 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.

[0113] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0114] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0115] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or can be attached to the surfaces 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 membrane.

[0116] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0117] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0118] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0119] In some embodiments, the electrode assembly is a stacked structure.

[0120] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be respectively provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0121] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0122] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folding segments.

[0123] As an example, a plurality of separators can be provided and are respectively disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0124] As an example, the separators can be continuously provided and are disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0125] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, etc.

[0126] In some embodiments, the electrode sheet of the electrode assembly is provided with tabs, and the tabs can conduct the current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0127] In some embodiments, a pressure relief mechanism is provided on the outer casing. The pressure relief mechanism is used to discharge the internal gas of the battery cell.

[0128] As an example, it is actuated to relieve the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. 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 damaged, thereby forming an opening or a channel for discharging the internal pressure or temperature. This threshold design varies according to different design requirements. The threshold may depend on one or several of the materials of the positive electrode sheet, negative electrode sheet, electrolyte, and separator in the battery cell.

[0129] As an example, the pressure relief mechanism can be integrally formed with the outer casing.

[0130] As an example, the pressure relief mechanism can also be separately provided and connected to the outer casing.

[0131] The "actuation" mentioned in this application refers to that the pressure relief mechanism generates an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell can be relieved. The actions generated by the pressure relief mechanism may include but are 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 breaks, is crushed, is torn, or is opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell are discharged outwards from the actuated part as emissions. In this way, the battery cell can be relieved of pressure and temperature under a controllable pressure or temperature, thereby reducing the occurrence of potential more serious accidents.

[0132] In some embodiments, when the outer casing is a non-sealed structure, the pressure relief mechanism can be set as a through hole for discharging the internal gas of the battery cell.

[0133] The emissions from the battery cell mentioned in this application include but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0134] The positive electrode tab and the negative electrode tab can be led out from the same end of the electrode sheet, or can be respectively led out from the opposite ends of the electrode sheet.

[0135] The structures of the positive electrode tab and the negative electrode tab can be the same or different. Taking the positive electrode tab as an example, the positive electrode tab can include a plurality of positive electrode tab layers, and the plurality of positive electrode tab layers are stacked together to form the positive electrode tab. The positive electrode tab can include at least two parts, one part is located between the main body part of the electrode sheet and the insulating member, and the other part is located between the insulating member and the electrode lead-out member.

[0136] The insulating member can insulate at least a part of the tab from the end face of the main body portion, so that when the battery cell is affected by external impacts, vibrations, etc., the risk of the tab being inserted into the main body portion can be reduced, thereby reducing the risk of short circuit of the battery cell and being beneficial to improving the reliability of the battery cell.

[0137] The insulating member can be of 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.

[0138] For example, the insulating member is a plastic part. The insulating member that is a plastic part is integrally formed by injection molding. The plastic part is convenient to process and has a low manufacturing cost.

[0139] In some embodiments of the present application, the outer shell includes a housing and an end cover. The housing has an opening. The end cover is connected to the housing and closes the opening. The end cover forms the first side wall, and the pressure relief mechanism is arranged on the end cover.

[0140] In some embodiments of the present application, the outer shell can 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 outer shell can be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell plays a role in protecting the electrode assembly. A sealing bag is further included between the outer shell and the electrode assembly, and the sealing bag is used for encapsulating the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum plastic film. When the outer shell is a sealed structure, it is used for encapsulating components such as the electrode assembly and the electrolyte. The housing can be provided with one or more openings. The end cover can also be provided with one or more.

[0141] In addition, the connection manner between the end cover and the housing includes but is not limited to snap connection, bonding, welding, or connection through a connecting member.

[0142] In some embodiments of the present application, the battery cell further includes an electrode terminal. The electrode terminal is arranged on the end cover and is electrically connected to the electrode assembly. The electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collecting member. The electrode terminal can be arranged on the end cover or on the housing. In the embodiment shown in the present application, the electrode terminal is arranged on the end cover.

[0143] In some embodiments of the present application, the current collecting member can be in 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 tab through the current collecting member, the electrode terminal is oppositely arranged with the welding groove of the current collecting member and is fixed by laser welding.

[0144] In addition, the material of the current collecting member includes but is not limited to aluminum, copper, or other alloy materials, etc.

[0145] As shown Figures 1 to 4 in the figure, in some embodiments of the present application, a manufacturing method of a welding fixture 10 is proposed. The welding fixture 10 manufactured by using this manufacturing method is used to fix the current collector member 20 of the battery cell during the manufacture of the battery cell. The manufacturing method of the welding fixture 10 includes:

[0146] S10: According to the type of the current collector member 20, create a plurality of fixture models. Each fixture model has a welding hole 11 through which the welding laser passes. Among the plurality of fixture models, the shapes of the welding holes 11 of at least any two fixture models are different.

[0147] Specifically, during the manufacturing process of the welding fixture 10, it is necessary to design the welding fixture 10 first. When designing, the welding fixture 10 is modeled first to form a fixture model. Create a plurality of fixture models, and the types of each fixture model are different, so as to select a fixture model that meets the requirements from the fixture models of different types.

[0148] By creating a plurality of 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 the plurality of fixture models through tests and other means, so as to manufacture a welding fixture 10 that meets the production requirements by using the fixture model that meets the design.

[0149] It should be noted that the fixture model includes a plurality of parameters, such as the thickness, length, width of the fixture model, or the shape of the welding hole 11. When welding the current collector member 20, the welding fixture 10 abuts against the current collector member 20, and the welding holes 11 of the welding fixture 10 are arranged circumferentially around the welding groove 21 of the current collector member 20. When the welding laser welds the current collector member 20, the welding slag generated will be received by the welding holes 11, and the shape of the welding holes 11 directly affects the cleaning of the welding slag. Therefore, in the present application, among the plurality of fixture models, the shapes of the welding holes 11 of any two fixture models are different, so that the welding holes 11 that meet the type of the current collector member 20 can be screened out in turn, so that the manufactured welding fixture 10 is conducive to the cleaning of the welding slag, so as to reduce the occurrence of the situation where the welding slag affects the welding quality.

[0150] In addition, among the plurality of fixture models, the shapes of the welding holes 11 of any two fixture models are different, that is, the shapes of each welding hole 11 are different. For example, the shapes of the welding holes 11 in the plurality of fixture models can be circular, elliptical, triangular, quadrilateral, pentagonal, and hexagonal, etc.

[0151] The shapes of the outer contours of multiple fixture models can be exactly the same, partially the same, or completely different. The shapes of the outer contours of multiple fixture models can be circular, oval, triangular, quadrilateral, pentagonal, hexagonal, etc. During the use of the welding fixture 10, the shape of its outer contour has little impact on the cleaning of welding slag. Based on this, for the convenience of design, in this application, the shapes of the outer contours of multiple fixture models are set to be the same. And to effectively adapt to the current collector member 20, the shapes of multiple fixture models are set to be square, and a round chamfer structure is provided at the corner positions of the outer contour.

[0152] In addition, the creation of the fixture model can be achieved by manually making a physical sample or by modeling with computer software. In this application, the creation of the fixture model is realized by modeling with computer software, which can shorten the design time and effectively reduce the manufacturing cost of the welding fixture 10.

[0153] In some embodiments of this application, in the step of S10, it includes:

[0154] S11: Determine the shape of the welding groove 21 on the current collector member 20.

[0155] Specifically, the current collector member 20 is adapted to the structure of the battery cell, that is, the current collector member 20 includes multiple types. Therefore, the welding fixture 10 needs to be adapted to the type of the current collector member 20.

[0156] Among them, the welding groove 21 on the current collector member 20 is one of the features adapted to the structure of the battery cell. And during welding, the welding holes 11 of the welding fixture 10 are arranged around the outer periphery of the welding groove 21. Therefore, when creating the fixture model, the shape of the welding groove 21 on the current collector member 20 needs to be considered, so that the manufactured welding fixture 10 can meet the production use requirements.

[0157] S12: Create multiple fixture models according to the shape of the welding groove 21. Among them, when the fixture model fixes the model of the current collector member 20, the entire welding groove 21 can be covered by the welding holes 11 of the fixture model.

[0158] Specifically, after determining the shape of the welding groove 21 of the current collector member 20, create the fixture model. During the creation process, it is necessary to ensure that when the fixture model fixes the model of the current collector member 20, the entire welding groove 21 can be covered by the welding holes 11 of the fixture model, so that the fixture model can be effectively adapted to the current collector member 20, thereby determining the fixture processing model among multiple fixture models, and further enabling the welding fixture 10 processed and manufactured according to the fixture processing model to effectively meet the production use requirements.

[0159] In some embodiments of the present application, the step S12 includes:

[0160] S121: Select materials for multiple fixture models.

[0161] Specifically, the material of the welding fixture 10 also affects the welding process of the current collector. Based on this, during the design process of the welding fixture 10, the material is also considered as a factor.

[0162] Among them, the material of the welding fixture 10 includes but is not limited to metals or non-metals. Among them, the material of the welding fixture 10 needs to meet the requirements of strength and thermal stability.

[0163] In the present application, the welding fixture 10 is a metal component or a component with a ceramic material plated 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 collector member 20. At the same time, it can also make the welding fixture 10 have good heat resistance, reducing the deformation of the welding fixture 10 caused by welding heat.

[0164] S122: According to the selected materials, create blank models for multiple fixture models. Among them, when the fixture model is fixed on the model of the current collector member 20, the redundancy between the edge of the blank model and the edge of the model of the current collector member 20 is in the range of 0 mm to 4 mm.

[0165] Specifically, use the selected materials to create blank models, and the number of blank models is multiple. Among them, the size of the blank models needs to be set. Taking the state where the fixture model is fixed on the model of the current collector member 20 as a reference, in this state, the blank model of the fixture model has a projection on the model of the current collector member 20, and this projection is within the range of the current collector member 20.

[0166] Among them, the redundancy refers to the minimum distance between the edge of the blank model and the edge of the current collector member 20. When the redundancy is 0 mm, the edge of the blank model is flush with the edge of the current collector member 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 collector member 20, and this distance can specifically be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm.

[0167] S123: Set the shapes of multiple welding holes 11.

[0168] Specifically, in order to obtain the optimal design scheme of the welding fixture 10, it is necessary to set the range of the shapes of the welding holes 11. For example, the set range includes circles, ellipses, triangles, quadrilaterals, pentagons, and hexagons.

[0169] S124: Create a plurality of fixture models in an orthogonal manner according to the redundancy amount of the edges of the blank model and the model of the current collector member 20 and the shapes of the plurality of welding holes 11.

[0170] Specifically, the redundancy amount of the edges of the blank model and the model of the current collector member 20 and the shapes of the plurality of welding holes 11 are two variables in the design process. By setting the two variables through orthogonal experiments, a plurality of fixture models with different specifications can be provided to offer more samples for the confirmation of the target model, so that the determined target model can meet the design requirements.

[0171] S20: Create a model of the current collector member 20, wherein the number of models of the current collector member 20 is the same as the number of fixture models.

[0172] It should be understood that the model of the current collector member 20 is modeled according to the current collector member 20 to be welded, so that the welding fixture 10 can effectively adapt to the current collector member 20.

[0173] S30: Conduct an optimization experiment on the plurality of fixture models to obtain a target model, wherein the welding holes 11 of the target model are circular, and when the target model is fixed on the model of the current collector member 20, there is redundancy around the model of the current collector member 20.

[0174] Specifically, during the design process of the welding fixture 10, the best fixture model needs to be selected from the plurality of fixture models as the target model, and the welding fixture 10 is processed and manufactured according to the target model. The target model is obtained through an optimization experiment.

[0175] In some embodiments of the present application, step S30 includes:

[0176] S31: Abutt each fixture model against the model of the current collector member 20, wherein the welding grooves 21 on each model of the current collector member 20 are disposed within the welding holes 11 of the fixture model.

[0177] Specifically, the fixture models and the models of the current collector member 20 are arranged in one-to-one correspondence, and each fixture model is abutted against one model of the current collector member 20. At the same time, the welding grooves 21 on the model of the current collector member 20 are received within the welding holes 11 of the fixture model, so as to reach a state where the model of the current collector member 20 can be welded. Furthermore, through further settings, the screening of the plurality of fixture models is realized to obtain the target model.

[0178] S32: Perform simulation welding on the models of the plurality of current collector members 20.

[0179] Specifically, the models of each current collector member 20 are respectively subjected to simulation welding, and the jig models are screened using welding data, thereby obtaining the target jig.

[0180] It should be understood that in this application, both the jig model and the model of the current collector member 20 are formed by computer software modeling. Based on this, the model of the current collector member 20 is subjected to simulation welding through computer software, which can shorten the design duration and design cost of the welding jig 10.

[0181] S33: Determine the target model according to the welding data.

[0182] Specifically, the welding jig 10 fixes the current collector member 20 during the welding process of the current collector member 20. Therefore, the method of screening multiple jig models based on the welding data is relatively accurate, thereby improving the accuracy of obtaining the target model.

[0183] Based on steps S31 to S33, the jig model is fixed on the model of the current collector member 20 by simulation welding, and the target model is determined through the welding data, which can shorten the design duration of the welding jig 10 and improve the manufacturing efficiency of the welding jig 10.

[0184] In some embodiments of this application, in step S24, it includes:

[0185] S331: Obtain the welding data, where the welding data includes the welding penetration depth, the deformation amount of the jig model, and the residual amount of metal particles after welding.

[0186] Specifically, during the welding process of the current collector member 20, the criteria for evaluating the welding effect of the current collector member 20 are generally reflected by aspects such as the welding penetration depth, the deformation amount of the jig model, and the residual amount of metal particles after welding. Based on this, in this application, using the welding penetration depth, the deformation amount of the jig model, and the residual amount of metal particles after welding as the basis for screening multiple jig models can further improve the accuracy.

[0187] S332: Screen out the jig models that meet the conditions among multiple jig models according to the maximum welding penetration depth, the deformation amount of the jig model being 0 mm, and the minimum residual amount of metal particles after welding, and determine the jig models that meet the conditions as the target model.

[0188] Specifically, the target type is determined through the welding penetration depth, the deformation amount of the jig model, and the residual amount of metal particles after welding, so that the target model can effectively meet the design requirements, and further the welding jig 10 produced according to the target model can effectively meet the production use requirements.

[0189] In some embodiments of this application, such as Figure 3As shown, in step S332, when the target model is fixed on the model of the current collector member 20, the diameter of the welding hole 11 is the first length b1, and the maximum dimension of the welding groove 21 of the current collector member 20 is the second length b2. Among them, 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. With such a setting, the welding hole 11 on the target model can effectively accommodate the welding groove 21 of the current collector, so that the welding fixture 10 processed according to the target model can effectively meet the production requirements.

[0190] It should be noted that the first coefficient can be an integer or a decimal. For example, the unit of the first coefficient is millimeters, and the values can be 0.5 mm, 1.5 mm, 2.5 mm, 3.5 mm, 4.5 mm, 5.5 mm, 6.5 mm.

[0191] In some embodiments of the present application, the first coefficient is in the range of 1 mm to 3 mm. With such a setting, when the welding fixture 10 processed according to the target model welds the current collector member 20, a redundant amount can be formed on the circumferential outside of the welding groove 21 of the current collector member 20, so as to improve the welding effect of the current collector member 20.

[0192] It should be noted that the value of the first coefficient can be 1 mm, 2 mm, or 3 mm.

[0193] In some embodiments of the present application, as Figure 3 shown, in step S332, when the target model is fixed on the model of the current collector member 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 collector member.

[0194] Along the first direction X, the distance between the first side 12 of the welding groove 21 of the current collector member 20 and the edge of the current collector member 20 is the third distance a3, and the distance between the second side 13 of the welding groove 21 of the current collector member 20 and the edge of the current collector member 20 is the fourth distance a4. Among them, the third distance a3 is greater than the sum of the first distance a1 and the second coefficient, and the fourth distance a4 is greater than the sum of the second distance a2 and the third coefficient. Both the first coefficient and the second coefficient are greater than 0.

[0195] With such a setting, when the welding fixture 10 processed according to the target model welds the current collector member 20, there is a redundant amount on the outside of the welding fixture 10 along the first direction X, so that the welding fixture 10 can be in full contact with the current collector member 20, thereby improving the pressing and positioning of the welding fixture 10 on the current collector member 20, and further improving the welding effect of the current collector member 20.

[0196] It should be noted that the second coefficient can be an integer or a decimal. For example, if the unit of the second coefficient is millimeter, its values can be 0.5 millimeter, 1.5 millimeters, 2.5 millimeters, 3.5 millimeters, 4.5 millimeters, 5.5 millimeters, 6.5 millimeters.

[0197] In some embodiments of the present application, the second coefficient is in the range of 1 millimeter to 3 millimeters. With such a setting, when the welding fixture 10 machined according to the target model welds the current collecting member 20, a redundancy amount can be formed on the first side 12 of the welding fixture 10, so as to improve the welding effect of the current collecting member 20.

[0198] It should be noted that the values of the second coefficient can be 1 millimeter, 2 millimeters, 3 millimeters.

[0199] In some embodiments of the present application, the third coefficient is in the range of 1 millimeter to 3 millimeters.

[0200] With such a setting, when the welding fixture 10 machined according to the target model welds the current collecting member 20, a redundancy amount can be formed on the second side 13 of the welding fixture 10, so as to improve the welding effect of the current collecting member 20.

[0201] It should be noted that the values of the third coefficient can be 1 millimeter, 2 millimeters, 3 millimeters.

[0202] In some embodiments of the present application, as Figure 3 shown, in the step of S332, when the target model is fixed on the model of the current collecting member 20, along the second direction Y (the second direction Y is the length direction of the current collecting member), 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. Along the second direction Y, the distance between the welding groove 21 of the current collecting member 20 and the edge of the current collecting member 20 at the third side 14 is the second dimension c2, where 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.

[0203] With such a setting, when the welding fixture 10 machined according to the target model welds the current collecting member 20, there is a redundancy amount on the outer side of the welding fixture 10 along the second direction Y, so that the welding fixture 10 can be in full contact with the current collecting member 20, thereby improving the pressing and positioning of the welding fixture 10 on the current collecting member 20, and further improving the welding effect of the current collecting member 20.

[0204] In some embodiments of the present application, the fourth coefficient is in the range of 1 millimeter to 3 millimeters.

[0205] It should be noted that the values of the fourth coefficient can be 1 millimeter, 2 millimeters, 3 millimeters.

[0206] S40: Machine the welding fixture 10 according to the target model.

[0207] Specifically, select the target model from multiple fixture models through optimization experiments, and use the structural parameters of the target model as the parameters for manufacturing the welding fixture 10, so as to improve the manufacturing accuracy of the welding fixture 10, enabling the manufactured welding fixture 10 to achieve a reduction in welding residues, improving the cleaning effect of welding slag in the welding holes 11, thereby reducing the process risk and the risk of adhesion between the welding fixture 10 and the current collector member 20.

[0208] In some embodiments of the present application, the steps in S30 include:

[0209] S41: Machine a fixture sample according to the target model.

[0210] S42: Obtain the structural parameters of the fixture sample, and 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 welding effect of the welding fixture 10 during use. Therefore, using surface cracks, surface flatness, and surface burrs as screening conditions to select the manufactured fixture sample can effectively improve the manufacturing accuracy of the welding fixture 10.

[0211] S43: Determine the fixture sample as the welding fixture 10 according to the surface cracks, surface flatness, and surface burrs meeting the set requirements. With this setting, the review of the fixture sample can be realized, reducing the defective fixture samples, thereby improving the manufacturing accuracy of the welding fixture 10 and further improving the welding effect of the current collector member 20 using the welding fixture 10.

[0212] It should be understood that in the present application, the set 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. With this setting, the fixture samples that do not meet the design requirements can be effectively screened out, further improving the manufacturing accuracy of the welding fixture 10 and further improving the welding effect of the current collector member 20 using the welding fixture 10.

[0213] In addition, in the step of machining the welding fixture 10, the machining method of the welding fixture 10 is turning, stamping, 3D printing, or injection molding. With this setting, the machining flexibility of the welding fixture 10 can be stronger, thus effectively meeting the requirements of production and manufacturing.

[0214] The welding jig 10 manufactured by the manufacturing method of the welding jig 10 according to the present application, when in use, the welding jig 10 abuts against the current collector member 20, and the current collector member 20 abuts against the electrode terminal. The current collector member 20 is fixed on the electrode terminal by using the welding jig 10 to achieve the positioning welding of the current collector member 20, so as to improve the welding accuracy. During welding, the welding laser passes through the welding hole 11 of the welding jig 10 and welds and fixes the current collector member 20 on the electrode terminal. Since the welding hole 11 of the welding jig 10 is set to be circular, during the process of slag cleaning, it is convenient for the slag to be cleaned out of the welding hole 11, reducing the situation of welding residue, improving the cleaning effect of the slag in the welding hole 11, thereby reducing the process risk and the risk of adhesion between the welding jig 10 and the current collector member 20.

[0215] The second aspect of the present application provides a welding device, which includes a welding jig 10, and the welding jig 10 is the welding jig 10 manufactured according to the manufacturing method of the welding jig 10 as above.

[0216] When the welding jig 10 of the present application is in use, the welding jig 10 abuts against the current collector member 20, and the current collector member 20 abuts against the electrode terminal. The current collector member 20 is fixed on the electrode terminal by using the welding jig 10 to achieve the positioning welding of the current collector member 20, so as to improve the welding accuracy. During welding, the welding laser passes through the welding hole 11 of the welding jig 10 and welds and fixes the current collector member 20 on the electrode terminal. Since the welding hole 11 of the welding jig 10 is set to be circular, during the process of slag cleaning, it is convenient for the slag to be cleaned out of the welding hole 11, reducing the situation of welding residue, improving the cleaning effect of the slag in the welding hole 11, thereby reducing the process risk and the risk of adhesion between the welding jig 10 and the current collector member 20.

[0217] The third aspect of the present application provides a battery production line, and the battery production line includes the welding device as above.

[0218] When the welding device of the present application is in use, the welding jig 10 abuts against the current collector member 20, and the current collector member 20 abuts against the electrode terminal. The current collector member 20 is fixed on the electrode terminal by using the welding jig 10 to achieve the positioning welding of the current collector member 20, so as to improve the welding accuracy. During welding, the welding laser passes through the welding hole 11 of the welding jig 10 and welds and fixes the current collector member 20 on the electrode terminal. Since the welding hole 11 of the welding jig 10 is set to be circular, during the process of slag cleaning, it is convenient for the slag to be cleaned out of the welding hole 11, reducing the situation of welding residue, improving the cleaning effect of the slag in the welding hole 11, thereby reducing the process risk and the risk of adhesion between the welding jig 10 and the current collector member 20.

[0219] The above description is only an overview of the technical solution of this application. In order to be able to understand the technical means of this application more clearly, it can be implemented in accordance with the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the following specifically gives the specific implementation manners of this application.

[0220] In an embodiment of this application, as Figures 1 to 4 shown, this application proposes a manufacturing method of a welding fixture 10. The welding fixture 10 is used to fix a current collector member 20 of a battery cell during the manufacture of the battery cell. The manufacturing method of the welding fixture 10 includes:

[0221] S10: According to the type of the current collector member 20, create a plurality of fixture models. Among them, each fixture model has a welding hole 11 through which a welding laser passes. Among the plurality of fixture models, at least the shapes of the welding holes 11 of each fixture model are different.

[0222] Determine the shape of the welding groove 21 on the current collector member 20. According to the shape of the welding groove 21, create a plurality of fixture models. Among them, when the fixture model is fixed on the model of the current collector member 20, the entire welding groove 21 can be covered by the welding hole 11 of the fixture model. Among them, select the materials of the plurality of fixture models. According to the selected materials, create blank models of the plurality of fixture models. Among them, when the fixture model is fixed on the model of the current collector member 20, the redundancy between the blank model and the edge of the model of the current collector member 20 is within the range of 0 mm to 4 mm. Set the shapes of the plurality of welding holes 11. According to the redundancy between the blank model and the edge of the model of the current collector member 20 and the shapes of the plurality of welding holes 11, create a plurality of fixture models in an orthogonal manner.

[0223] S20: Create a model of the current collector member 20, where the number of models of the current collector member 20 is the same as the number of fixture models.

[0224] S30: Conduct an optimization test on the plurality of fixture models to obtain a target model. Among them, the welding hole 11 of the target model is circular, and when the target model is fixed on the model of the current collector member 20, there is redundancy around the model of the current collector member 20 in the target model.

[0225] Create a model of the current collector member 20, where the number of models of the current collector member 20 is the same as the number of fixture models;

[0226] Abut each fixture model against the model of the current collector member 20 one by one. Among them, the welding groove 21 on each model of the current collector member 20 is arranged in the welding hole 11 of the fixture model;

[0227] Conduct a simulation welding on the plurality of models of the current collector member 20;

[0228] Determine the target model according to the welding data. Among them, obtain the welding data, where the welding data includes the welding penetration depth, the deformation amount of the fixture model, and the residual amount of metal particles after welding;

[0229] According to the maximum welding penetration depth, the deformation amount of the fixture model being 0 mm, and the least residual amount of metal particles after welding, screen out the qualified fixture models from multiple fixture models, and determine the qualified fixture models as the target model. When the target model fixes the model of the current collector member 20, the diameter of the welding hole 11 is the first length b1, and the maximum dimension of the welding groove 21 of the current collector member 20 is the second length b2, where 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 fixes the model of the current collector member 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 collector member. Along the first direction X, the distance between the welding groove 21 of the current collector member 20 and the edge of the current collector member 20 on the first side 12 is the third distance a3, and the distance between the welding groove 21 of the current collector member 20 and the edge of the current collector member 20 on the second side 13 is the fourth distance a4, where the third distance a3 is greater than the sum of the first distance a1 and the second coefficient, and the fourth distance a4 is greater than the sum of the second distance a2 and the third coefficient. Both the first coefficient and the second coefficient are 1. When the target model fixes the model of the current collector member 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 collector member. Along the second direction Y, the distance between the welding groove 21 of the current collector member 20 and the edge of the current collector member 20 on the third side 14 is the second dimension c2, where the second dimension c2 is greater than the sum of the first dimension c1 and the fourth coefficient, and the fourth coefficient is 1.

[0230] S40: Machine the welding fixture 10 according to the target model.

[0231] Machine a fixture sample according to the target model, obtain the structural parameters of the fixture sample. The structural parameters at least include surface cracks, surface flatness, and surface burrs. According to the surface cracks, surface flatness, and surface burrs meeting the set requirements, determine the fixture sample as the welding fixture 10. The set requirements are 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 machining method of the welding fixture 10 is turning, stamping, 3D printing, or injection molding.

[0232] The welding jig 10 manufactured by the manufacturing method of the welding jig 10 according to the present application, when in use, the welding jig 10 abuts against the current collector member 20, and the current collector member 20 abuts against the electrode terminal, and the current collector member 20 is fixed on the electrode terminal by the welding jig 10 to achieve the positioning welding of the current collector member 20, so as to improve the welding accuracy. During welding, the welding laser passes through the welding hole 11 of the welding jig 10 and welds and fixes the current collector member 20 on the electrode terminal. Since the welding hole 11 of the welding jig 10 is set to be circular, during the process of slag cleaning, it is convenient for the slag to be cleaned out of the welding hole 11, reducing the situation of welding residue, improving the cleaning effect of the slag in the welding hole 11, thereby reducing the process risk and the risk of adhesion between the welding jig 10 and the current collector member 20.

[0233] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling 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; The fixture model is brought into contact with the model of the current collecting component one by one, and the welding groove on each model of the current collecting component is set in the welding hole of the fixture model. The multiple models of the current collecting component are subjected to simulation welding to obtain 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 is 0 mm, and the residual metal particles after welding is the least, 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, 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; A fixture sample is processed according to the target model to obtain structural parameters of the fixture sample, wherein the structural parameters at least include surface cracks, surface flatness and surface burrs; and the fixture sample is determined to be the welding fixture based on whether the surface cracks, the surface flatness and the surface burrs meet the set requirements.

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 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.

5. The method for manufacturing a welding fixture according to claim 4, characterized in that: The first coefficient is in the range of 1 mm to 3 mm.

6. The method for manufacturing a welding jig according to claim 4, 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 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.

7. The method for manufacturing a welding jig according to claim 6, wherein: 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.

8. The method for manufacturing a welding fixture according to claim 1, 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 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.

9. The method for manufacturing a welding jig according to claim 8, characterized in that: The fourth coefficient is in the range of 1 mm to 3 mm.

10. The method for manufacturing a welding jig according to claim 1, 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.

11. The method for manufacturing a welding jig according to any one of claims 1 to 10, 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.

12. 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 the welding jig according to any one of claims 1 to 11.

13. A battery production line, characterized in that: The battery production line comprises the welding apparatus according to claim 12.

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