Conductive block and detection mechanism

Abstract

The embodiment of the invention provides a conductive block and a detection mechanism. The conductive block is used for pressing a tab of the electrode assembly to carry out withstand voltage detection and comprises a transition surface, and the transition surface is matched with an inclined surface formed after the tab is pressed. According to the technical scheme provided by the invention, the electrode assembly is subjected to withstand voltage detection through the conductive block, and the transition surface is matched with the inclined surface formed after the tab is pressed, so that the risk that the tab is damaged due to stress concentration caused by abutting between the conductive block and the tab when the conductive block presses the tab is reduced, and the risk that the tab is damaged due to stress concentration caused by abutting between the conductive block and the tab is reduced; and meanwhile, the risk that the tabs are warped due to creases generated when the tabs are pressed is also reduced, so that the reliability of the electrode assembly is improved, and the reliability of the single battery and the battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a conductive block and a detection mechanism. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] In the development of battery technology, how to improve battery reliability is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present application provides a conductive block and a detection mechanism, which can improve the reliability of a battery.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, the present application provides a conductive block for pressing a tab of an electrode assembly for withstand voltage testing. The conductive block includes a transition surface that matches an inclined surface formed after the tab is pressed.

[0007] The technical solution of the embodiment of the present application performs a withstand voltage test on the electrode assembly through a conductive block, and the transition surface matches the inclined surface formed after the pole ear is pressed together, thereby reducing the risk of stress concentration caused by the conductive block abutting against the pole ear when pressing the pole ear, thereby damaging the pole ear, and the risk of stress concentration caused by the conductive block abutting against the pole ear, thereby damaging the pole ear. At the same time, it also reduces the risk of the pole ear warping caused by the crease generated when the pole ear is pressed together, thereby improving the reliability of the electrode assembly, thereby improving the reliability of the battery cell and the battery.

[0008] In some embodiments, the conductive block further includes a first surface, the first surface is used for pressing the tab, and the transition surface is disposed adjacent to the first surface.

[0009] In some embodiments, the first surface and the transition surface are both planes, and the angle between the first surface and the transition surface is an obtuse angle.

[0010] The technical solution of the embodiment of the present application is to perform a withstand voltage test on the electrode assembly through a conductive block, and the first surface of the conductive block is pressed against the pole ear of the electrode assembly, and when the transition surface and the first surface are both planes, the angle between the transition surface and the first surface is an obtuse angle. When the pole ear is pressed against the first surface, the angle between the transition surface and the first surface is an obtuse angle, which reduces the risk of stress concentration and damage to the pole ear due to the corresponding angle being too small when the conductive block abuts against the pole ear, and also reduces the risk of the pole ear warping caused by the crease generated when pressing the pole ear, thereby improving the reliability of the electrode assembly, thereby improving the reliability of the battery cell and the battery.

[0011] In some embodiments, the angle between the first surface and the transition surface is α1, which satisfies: 110°≤α1≤150°.

[0012] In the technical solution of the embodiment of the present application, the first surface and the transition surface are both planes, and the angle α1 between the first surface and the transition surface satisfies 110°≤α1≤150°. When α1≥110°, the risk of stress concentration damaging the tab due to the first edge where the conductive block abuts the tab is too small, and the risk of the tab warping due to the crease generated when the tab is pressed together is also reduced, thereby improving the reliability of the electrode assembly, thereby improving the reliability of the battery cell and the battery. When α1≤150°, the risk of stress concentration damaging the tab due to the second edge where the conductive block abuts the tab is too small, and the risk of the tab warping due to the crease generated when the tab is pressed together is also reduced, thereby improving the reliability of the electrode assembly, thereby improving the reliability of the battery cell and the battery.

[0013] In some embodiments, the first surface is a plane, and the transition surface is a curved surface.

[0014] In some embodiments, the transition surface is tangent to the first surface.

[0015] According to the technical solution of the embodiment of the present application, when the first surface is a plane and the transition surface is an arc surface, the transition surface is tangent to the first surface, so that when the conductive block is pressed onto the pole ear, the first surface abuts against the pole ear more smoothly, thereby reducing the risk of damage to the pole ear caused by the abutment between the first surface and the pole ear, and also reducing the risk of warping of the pole ear caused by creases generated when pressing the pole ear, thereby improving the reliability of the electrode assembly, thereby improving the reliability of the battery cell and the battery.

[0016] In some embodiments, the conductive block also includes a second surface, and the first surface, the transition surface, and the second surface are arranged in sequence along the circumference of the conductive block, the first surface and the transition surface intersect at a first edge, and the transition surface is connected to the second surface and intersects at a second edge; wherein the first edge and the second edge define a first reference plane, and the transition surface is an arc surface protruding from the first reference plane.

[0017] The technical solution of the embodiment of the present application is to perform a withstand voltage test on the electrode assembly through a conductive block, the first surface of the conductive block is pressed with the pole ear of the electrode assembly, the first surface is connected to the transition surface through the first edge, and the second surface is connected to the transition surface through the second edge. When the pole ear is pressed on the first surface, the first edge and the second edge can abut against the pole ear, reducing the risk of stress concentration and damage to the pole ear when only one edge of the conductive block abuts against the pole ear when pressing the pole ear, and also reducing the risk of the pole ear warping caused by the crease generated when pressing the pole ear, thereby improving the reliability of the electrode assembly, thereby improving the reliability of the battery cell and the battery.

[0018] In some embodiments, the angle formed by the first reference plane and the first surface is an obtuse angle.

[0019] In the technical solution of the embodiment of the present application, when the transition surface is a curved surface, the angle between the first reference plane defined by the first edge and the second edge and the first surface is an obtuse angle. When the first surface is pressed with the tab, the first edge and the second edge can abut against the tab, and the angle between the first reference plane and the first surface is an obtuse angle, which reduces the risk of stress concentration and thus damage to the tab when only one edge of the conductive block abuts against the tab when pressing the tab, and the risk of stress concentration and damage to the tab due to the angle corresponding to the first edge of the conductive block abutting against the tab being too small, and also reduces the risk of the tab warping due to the crease generated when pressing the tab, thereby improving the reliability of the electrode assembly, thereby improving the reliability of the battery cell and the battery.

[0020] In some embodiments, the angle between the first reference plane and the first surface is α2, satisfying: 110°≤α2≤150°.

[0021] In the technical solution of the embodiment of the present application, the first surface is a plane, the transition surface is an arc surface, and the angle α2 between the first surface and the first reference plane satisfies 110°≤α2≤150°. When α2≥110°, the risk of stress concentration damaging the pole ear due to the angle corresponding to the first edge where the conductive block abuts the pole ear is too small is reduced, and the risk of the pole ear warping due to the crease generated when the pole ear is pressed is also reduced, thereby improving the reliability of the electrode assembly, thereby improving the reliability of the battery cell and the battery. When α2≤150°, the risk of stress concentration damaging the pole ear due to the angle corresponding to the second edge where the conductive block abuts the pole ear is too small is reduced, and the risk of the pole ear warping due to the crease generated when the pole ear is pressed is also reduced, thereby improving the reliability of the electrode assembly, thereby improving the reliability of the battery cell and the battery.

[0022] In some embodiments, the transition surface is tangent to the second surface.

[0023] According to the technical solution of the embodiment of the present application, when the second surface is a plane and the transition surface is an arc surface, the transition surface is tangent to the second surface, so that when the conductive block is pressed onto the pole ear, the second edge abuts against the pole ear more smoothly, thereby reducing the risk of damage to the pole ear caused by the abutment between the second edge of the conductive block and the pole ear, and also reducing the risk of warping of the pole ear caused by creases generated when pressing the pole ear, thereby improving the reliability of the electrode assembly, thereby improving the reliability of the battery cell and the battery.

[0024] In some embodiments, the extended surface of the first surface intersects the extended surface of the second surface.

[0025] In some embodiments, the extension surface of the first surface is orthogonal to the extension surface of the second surface.

[0026] In some embodiments, the first surface is a plane, the transition surface is a curved surface, the second reference plane is parallel to the first reference plane, and the second reference plane is tangent to the transition surface, the distance between the first reference plane and the second reference plane is d1, the extended surface of the first surface and the extended surface of the second surface intersect at a first reference line, the first reference line is parallel to the first reference plane, and the distance between the first reference line and the first reference plane is d2, satisfying: 0.3d2≤d1≤0.7d2.

[0027] In the technical solution of the embodiment of the present application, the distance between the first reference plane and the second reference plane is d1, and the distance between the first reference line and the first reference plane is d2, which satisfies 0.3d2≤d1≤0.7d2. When d1≥0.3d2, the contact area between the transition surface and the pole ear can be increased, reducing the risk of the second edge of the conductive block abutting against the pole ear and causing damage to the pole ear, and also reducing the risk of the crease generated when the pole ear is pressed together and causing the pole ear to warp, thereby improving the reliability of the electrode assembly, thereby improving the reliability of the battery cell and the battery. When d1≤0.7d2, the risk of the portion of the transition surface protruding too much from the first reference plane and thus causing damage to the pole ear can be reduced, and the risk of the portion of the transition surface protruding too much from the first reference plane and thus causing the second edge to not abut against the pole ear, thereby causing the first edge to abut against the pole ear and causing stress concentration and damaging the pole ear can be reduced.

[0028] In some embodiments, the conductive block has a third surface connected to the second surface, the third surface is parallel to the first surface, and a distance between the first surface and the third surface is d3, satisfying: 0<d3≤50mm.

[0029] In the technical solution of the embodiment of the present application, the third surface is connected to the second surface and the third surface is parallel to the second surface, and the distance d3 between the first surface and the third surface satisfies 0<d3≤50mm. When the electrode assembly is subjected to a withstand voltage test, the two ends of the body of the electrode assembly can be clamped by a pressing plate, and then the tabs can be pressed by a conductive block. When d3≤50mm, the risk of interference between the conductive block and the pressing plate due to excessive size can be reduced, thereby improving the convenience of pressing the tabs with the conductive block.

[0030] In some embodiments, 10 mm ≤ d3 ≤ 20 mm.

[0031] In the technical solution of the embodiment of the present application, the distance d3 between the first surface and the third surface satisfies 10mm≤d3≤20mm. When d3≥10mm, the conductive block has a certain thickness, which is convenient for pressing the tabs and improves the convenience of operation. When d3≤20mm, the risk of interference between the conductive block and the pressing plate due to excessive size can be better reduced, thereby improving the convenience of pressing the conductive block with the tabs.

[0032] In some embodiments, the first surface is parallel to the second surface, and a distance between the first surface and the second surface is d4, which satisfies: 0<d4≤50mm.

[0033] In the technical solution of the embodiment of the present application, the first surface is parallel to the second surface, and the distance d4 between the first surface and the second surface satisfies 0<d4≤50mm. When the electrode assembly is subjected to a withstand voltage test, the two ends of the body of the electrode assembly can be clamped by a pressing plate, and then the tabs can be pressed by a conductive block. When d4≤50mm, the risk of interference between the conductive block and the pressing plate due to excessive size can be reduced, thereby improving the convenience of pressing the tabs with the conductive block.

[0034] In some embodiments, 10 mm ≤ d4 ≤ 20 mm.

[0035] In the technical solution of the embodiment of the present application, the distance d4 between the first surface and the second surface satisfies 10mm≤d4≤20mm. When d4≥10mm, the conductive block has a certain thickness, which is convenient for pressing the tabs and improves the convenience of operation. When d4≤20mm, the risk of interference between the conductive block and the pressing plate due to excessive size can be better reduced, thereby improving the convenience of pressing the conductive block with the tabs.

[0036] In the second aspect, the present application also provides a detection mechanism for a withstand voltage test of an electrode assembly, the detection mechanism comprising a conductive block, a first pressure plate, a second pressure plate and an elastic member according to any embodiment of the first aspect, the conductive block being used to press the pole ears of the electrode assembly, the first pressure plate and the second pressure plate being spaced apart along a first direction, the first pressure plate and the second pressure plate being used to clamp the main body of the electrode assembly; one end of the elastic member is connected to the first pressure plate, and the other end is connected to the conductive block.

[0037] In the technical solution of the embodiment of the present application, the detection mechanism performs a withstand voltage test on the electrode assembly, and the detection mechanism includes a first pressing plate, a second pressing plate, a conductive block and an elastic member, the first pressing block and the second pressing block jointly clamp the main body of the electrode assembly, the conductive block is connected to the first pressing block through the elastic member, and the conductive block presses the pole ear of the electrode assembly. The detection mechanism performs a withstand voltage test on the electrode assembly, which reduces the risk of damaging the pole ear and the risk of the pole ear warping caused by the folds produced by the conductive block pressing the pole ear, and improves the reliability of the electrode assembly, thereby improving the reliability of the battery cell and the battery.

[0038] In some embodiments, the conductive block is constructed in two pieces, and the two conductive blocks are used to press the positive electrode tab and the negative electrode tab of the electrode assembly respectively.

[0039] The technical solution of the embodiment of the present application improves detection efficiency and convenience by respectively pressing the positive electrode tab and the negative electrode tab with two conductive blocks, and pressing the positive electrode tab and the negative electrode tab with two conductive blocks at the same time.

[0040] In some embodiments, the distance between the two conductive blocks is adjustable to accommodate electrode assemblies of different sizes.

[0041] According to the technical solution of the embodiment of the present application, two conductive blocks are respectively pressed together with the positive electrode tab and the negative electrode tab. For electrode assemblies of different sizes, the distance between the positive electrode tab and the negative electrode tab is different. By adjusting the distance between the two conductive blocks, electrode assemblies of different sizes can be adapted to press together the positive electrode tab and the negative electrode tab at different distances, thereby improving the practicality and applicability of the detection mechanism.

[0042] In some embodiments, a sliding rod and a sliding block are disposed on the first pressing plate. The sliding block is slidably disposed on the sliding rod. One end of the elastic member is connected to the sliding block, and the other end is connected to the conductive block.

[0043] The technical solution of the embodiment of the present application is to set a sliding rod on the first pressure plate and connect the conductive block to the slider through an elastic member. The slider can slide on the sliding rod to adjust the distance between the two conductive blocks, thereby improving the applicability and practicality of the detection mechanism. The sliding rod and the slider are simple in structure, easy to obtain, and cost-saving.

[0044] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0047] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0048] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0049] Figure 4 A schematic diagram of the structure of a conductive block provided in some embodiments of the present application;

[0050] Figure 5 for Figure 4 Schematic diagram of another perspective of the conductive block;

[0051] Figure 6A schematic diagram of the structure of a conductive block provided in some other embodiments of the present application;

[0052] Figure 7 for Figure 6 Schematic diagram of another perspective of the conductive block;

[0053] Figure 8 Schematic diagram of a conductive block provided for some other embodiments of the present application;

[0054] Fig. 9 A schematic diagram of a conductive block provided in some further embodiments of the present application;

[0055] Fig.10 A schematic diagram of the structure of a detection mechanism provided in some embodiments of the present application;

[0056] Fig.11 for Fig.10 Schematic diagram of another perspective of the detection mechanism.

[0057] Icons: 1-conductive block; 2-first surface; 3-transition surface; 4-second surface; 5-first edge; 6-second edge; 7-first reference plane; 8-second reference plane; 9-third surface; 10-detection mechanism; 11-first pressure plate; 12-second pressure plate; 13-elastic member; 14-sliding rod; 15-sliding block; 16-fourth surface; 17-fifth surface; 18-first reference line; 19-sub-surface; 100-electrode assembly; 101-main body; 102-ear; 103-positive electrode ear; 104-negative electrode ear; 105-battery cell; 106-housing; 107-electrode terminal; 108-shell; 109-end cover; 110-battery; 111-battery case; 112-first sub-case; 113-second sub-case; 1000-vehicle; 1100-controller; 1200-motor; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0059] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0060] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0061] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0063] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0064] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0065] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0066] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0067] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0068] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0069] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0070] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0071] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0072] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0073] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0074] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0075] 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 positive electrode active materials for batteries may also be used.

[0076] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0077] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used.

[0078] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0079] As an example, the negative electrode active material may adopt the negative electrode active material for the battery 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, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0080] In some embodiments, the separator is a membrane. The present application has no particular limitation on the type of the membrane, and any known porous membrane with good chemical stability and mechanical stability can be selected.

[0081] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0082] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0083] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0084] At present, from the perspective of market development, batteries have been widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as electric tools, drones, energy storage equipment, etc. As the application areas of batteries continue to expand, the market demand is also constantly expanding.

[0085] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, as environmental conditions and / or battery internal conditions change, battery reliability is also one of the key factors to consider.

[0086] At present, the produced electrode assemblies are usually subjected to a withstand voltage test, also known as a short circuit test, before use. The test method is to press the tabs together with the conductive blocks and electrically connect them to the tabs, and then electrically connect the conductive blocks with an external withstand voltage test mechanism to achieve the withstand voltage test of the electrode assembly.

[0087] However, in the process of pressing the conductive block onto the electrode assembly's tabs, when the conductive block presses the tabs through the outer circumferential surface, the tabs may have more layers, and the thickness of the multi-layer tabs is relatively large. When the existing conductive blocks are used to press the tabs, the creases produced may cause the tabs to warp, resulting in the risk of poor welding such as welding leaks when the tabs of the electrode assembly are welded to the connecting pieces or the top cover when the electrode assembly is formed into a battery cell, or the stress in the crease part is too concentrated, thereby damaging the tabs, thereby affecting the reliability of the battery cell, and further affecting the reliability of the battery.

[0088] Based on the above considerations, in order to reduce the risk of stress concentration caused by the contact between the conductive block and the tab, thereby damaging the tab, and to reduce the risk of poor welding such as the tab warping caused by the folds generated when the tab is pressed together, thereby improving the reliability of the electrode assembly and the reliability of the battery. The embodiment of the present application provides a conductive block for pressing the tab of the electrode assembly for withstand voltage testing, and the conductive block includes a transition surface, which matches the inclined surface formed after the tab is pressed together.

[0089] The electrode assembly is subjected to a withstand voltage test using a conductive block, and the transition surface matches the inclined surface formed after the tab is pressed together, thereby reducing the risk of stress concentration caused by the conductive block abutting against the tab when pressing the tab, thereby damaging the tab, and the risk of stress concentration caused by the conductive block abutting against the tab, thereby damaging the tab. At the same time, it also reduces the risk of the tab warping caused by the creases produced when pressing the tab, thereby improving the reliability of the electrode assembly, thereby improving the reliability of the battery cell and the battery.

[0090] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. The battery disclosed in the present application can be used to form a power supply system of the electrical equipment.

[0091] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0092] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in some embodiments of the present application.

[0093] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 110 is provided inside the vehicle 1000, and the battery 110 may be provided at the bottom, head or tail of the vehicle 1000. The battery 110 may be used to power the vehicle 1000, for example, the battery 110 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0094] The vehicle 1000 may further include a controller 1100 and a motor 1200 , wherein the controller 1100 is used to control the battery 110 to supply power to the motor 1200 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0095] In some embodiments of the present application, the battery 110 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0096] Please refer to Figure 2 , Figure 2An exploded view of a battery 110 provided in some embodiments of the present application. The battery 110 may also include a battery case 111, in which the battery cell 105 is accommodated. The battery case 111 is used to provide a storage space for the battery cell 105, and the battery case 111 may adopt a variety of structures. In some embodiments, the battery case 111 may include a first sub-case 112 and a second sub-case 113, the first sub-case 112 and the second sub-case 113 cover each other, and the first sub-case 112 and the second sub-case 113 jointly define a storage space for accommodating the battery cell 105. The second sub-box 113 may be a hollow structure with one end open, and the first sub-box 112 may be a plate-like structure. The first sub-box 112 covers the open side of the second sub-box 113, so that the first sub-box 112 and the second sub-box 113 jointly define a storage space; the first sub-box 112 and the second sub-box 113 may also be hollow structures both with one side open, and the open side of the first sub-box 112 covers the open side of the second sub-box 113.

[0097] In the battery 110, there may be multiple battery cells 105, and the multiple battery cells 105 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 105 are both connected in series and in parallel. The multiple battery cells 105 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 105 is accommodated in the battery box 111; of course, the battery 110 may also be a battery module formed by connecting multiple battery cells 105 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the battery box 111. The battery 110 may also include other structures, for example, the battery 110 may also include a busbar component for realizing electrical connection between the multiple battery cells 105.

[0098] The battery cell 105 may be a secondary battery or a primary battery; the battery cell 105 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0099] Please refer to Figure 3 , Figure 3 1 is an exploded view of a battery cell 105 provided in some embodiments of the present application. Figure 3 As shown, the battery cell 105 includes a housing 106, an electrode assembly 100 and an electrode terminal 107. The housing 106 includes a shell 108 and an end cap 109. The shell 108 has an opening, and the end cap 109 closes the opening to isolate the internal environment of the battery cell 105 from the external environment.

[0100] The shell 108 is a component used to cooperate with the end cap 109 to form an internal environment of the battery cell 105, wherein the formed internal environment can be used to accommodate the electrode assembly 100, the electrolyte and other components. The shell 108 and the end cap 109 can be independent components. The shell 108 can be of various shapes and sizes. Specifically, the shape of the shell 108 can be determined according to the specific shape and size of the electrode assembly 100. The material of the shell 108 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0101] The end cap 109 refers to a component that covers the opening of the shell 108 to isolate the internal environment of the battery cell 105 from the external environment. Without limitation, the shape of the end cap 109 can be adapted to the shape of the shell 108 to match the shell 108. Optionally, the end cap 109 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 109 is not easily deformed when squeezed and collided, so that the battery cell 105 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals 107 can be provided on the end cap 109. The electrode terminal 107 can be used to electrically connect to the electrode assembly 100 for outputting or inputting electrical energy of the battery cell 105. The material of the end cap 109 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 109, and the insulating structure may be used to isolate the electrical connection components in the housing 108 from the end cap 109 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0102] The electrode assembly 100 is a component in the battery cell 105 where an electrochemical reaction occurs. One or more electrode assemblies 100 may be included in the housing 108. The electrode assembly 100 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid short circuits between the positive electrode sheet and the negative electrode sheet to a certain extent. The part of the positive electrode sheet and the negative electrode sheet with active materials constitutes the main body 101 of the electrode assembly 100, the part of the positive electrode sheet without active materials constitutes the positive electrode ear 103, and the part of the negative electrode sheet without active materials constitutes the negative electrode ear 104. The positive electrode ear 103 and the negative electrode ear 104 can be located together at one end of the main body 101. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the ear 102 connects the electrode terminal 107 to form a current loop.

[0103] Please refer to Figures 4 to 9 , Figure 4 This is a schematic diagram of the structure of the conductive block 1 provided in some embodiments of the present application. Figure 5 for Figure 4 A schematic diagram of another perspective of the conductive block 1, Figure 6 This is a schematic diagram of the structure of the conductive block 1 provided in some other embodiments of the present application. Figure 7 for Figure 6 A schematic diagram of another perspective of the conductive block 1, Figure 8 Schematic diagram of a conductive block 1 provided in some embodiments of the present application, Fig. 9 This is a schematic diagram of a conductive block 1 provided in some embodiments of the present application. It should be explained that: Figure 5 , Figures 7 to 9 The viewing angle in is a viewing angle with the second direction Y as the viewing direction. The second direction Y may be a direction perpendicular to the fifth surface 17. The embodiment of the present application provides a conductive block 1 for pressing the tab 102 of the electrode assembly 100 for withstand voltage testing. The conductive block 1 includes a transition surface 3, and the transition surface 3 matches the inclined surface formed after the tab 102 is pressed.

[0104] In some embodiments, the withstand voltage test can be performed by pressing the electrode tab 102 with the conductive block 1 and electrically connecting the conductive block 1 to the electrode tab 102 , and connecting the conductive block 1 to an external detection device to detect whether the power supply of the electrode assembly 100 is qualified.

[0105] In some embodiments, the tab 102 may be a multi-layer tab 102. The multi-layer tab 102 may be placed in a horizontal direction, and the thickness direction of the multi-layer tab 102 may be a vertical direction. The conductive block 1 moves downward in the vertical direction, and the first surface 2 is located in the horizontal direction and contacts the upper layer of the multi-layer tab 102. The multi-layer tab 102 is pressed in the vertical direction, so that the total thickness of the multi-layer tab 102 is reduced. During the pressing process, the thickness of the multi-layer tab 102 is reduced, and the portion of the tab 102 close to the body 101 is deformed, and the first edge 5 and the second edge 6 are both in contact with the tab 102.

[0106] According to the technical solution of the embodiment of the present application, the electrode assembly 100 is subjected to a withstand voltage test through the conductive block 1, and the transition surface 3 matches the inclined surface formed after the pole ear 102 is pressed together, thereby reducing the risk of stress concentration caused by the conductive block 1 abutting against the pole ear 102 when pressing the pole ear 102, thereby damaging the pole ear 102, and the risk of stress concentration caused by the conductive block 1 abutting against the pole ear 102, thereby damaging the pole ear 102. At the same time, it also reduces the risk of the pole ear 102 warping due to the crease generated when the pole ear 102 is pressed together, thereby improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery cell 105 and the battery 110.

[0107] In some embodiments, the conductive block 1 further includes a first surface 2 , the first surface 2 is used for pressing the tab 102 , and the transition surface 3 is disposed adjacent to the first surface 2 .

[0108] In some embodiments, the first surface 2 and the transition surface 3 are both planes, and the angle between the first surface 2 and the transition surface 3 is an obtuse angle.

[0109] Please refer to Figures 4 to 5 In some embodiments, the first surface 2 and the transition surface 3 may both be planes, and the angle between the solid surface of the first surface 2 and the solid surface of the transition surface 3 is an obtuse angle rather than an angle between extended surfaces. That is, during the pressing process, when the first surface 2 is arranged in the horizontal direction, the transition surface 3 is arranged obliquely upward in the direction close to the main body 101 of the electrode assembly 100, so that the first edge 5 and the second edge 6 are both in contact with the tab 102.

[0110] The technical solution of the embodiment of the present application is to perform a withstand voltage test on the electrode assembly 100 through the conductive block 1, and the first surface 2 of the conductive block 1 is pressed against the pole ear 102 of the electrode assembly 100. When the transition surface 3 and the first surface 2 are both planes, the angle between the transition surface 3 and the first surface 2 is an obtuse angle. When the pole ear 102 is pressed against the first surface 2, the angle between the transition surface 3 and the first surface 2 is an obtuse angle, which reduces the risk of stress concentration and damage to the pole ear 102 due to the corresponding angle being too small when the conductive block 1 abuts against the pole ear 102, and also reduces the risk of the pole ear 102 warping due to the crease generated when the pole ear 102 is pressed, thereby improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery cell 105 and the battery 110.

[0111] Please refer to Figures 4 to 5 In some embodiments, the first surface 2 and the transition surface 3 are both planes, and the angle between the first surface 2 and the transition surface 3 is α1, which satisfies: 110°≤α1≤150°.

[0112] In some embodiments, the first surface 2 and the transition surface 3 may both be planes, and the angle between the first surface 2 and the transition surface 3 is α1. During the pressing process, the first surface 2 and the transition surface 3 both extend along the second direction Y, and the first surface 2 is arranged in the horizontal direction. The extending direction of the first surface 2 and the transition surface 3 is the observation direction, wherein, Figure 5 The viewing angle direction is the same as the observation direction. In the observation direction, the first surface 2 and the transition surface 3 are two connected straight lines, and the angle between the two straight lines is α1.

[0113] In some embodiments, α1 satisfies 110°≤α1≤150°. For example, α1 may be 110°, 112°, 114°, 116°, 118°, 120°, 122°, 124°, 126°, 128°, 130°, 132°, 134°, 136°, 138°, 140°, 142°, 144°, 146°, 148°, 150°, etc.

[0114] In some embodiments, α1 may be 135°.

[0115] In some embodiments, the angle α1 may be measured by attaching a protractor to a surface connected to both the first surface 2 and the transition surface 3 to measure the angle α1 between the first surface 2 and the transition surface 3 .

[0116] In the technical solution of the embodiment of the present application, the first surface 2 and the transition surface 3 are both planes, and the angle α1 between the first surface 2 and the transition surface 3 satisfies 110°≤α1≤150°. When α1≥110°, the risk of stress concentration damaging the tab 102 due to the angle corresponding to the first edge 5 where the conductive block 1 abuts the tab 102 is reduced, and the risk of the tab 102 warping due to the crease generated when the tab 102 is pressed is also reduced, thereby improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery cell 105 and the battery. When α1≤150°, the risk of stress concentration damaging the tab 102 due to the angle corresponding to the second edge 6 where the conductive block 1 abuts the tab 102 is reduced, and the risk of the tab 102 warping due to the crease generated when the tab 102 is pressed is also reduced, thereby improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery cell 105 and the battery.

[0117] Please refer to Figure 6 to Figure 7 In some embodiments, the first surface 2 is a plane, the transition surface 3 is a curved surface, and the transition surface 3 is tangent to the first surface 2 .

[0118] In some embodiments, the first surface 2 may be a plane, the transition surface 3 may be a curved surface, and the transition surface 3 may be tangent to the first surface 2. When the transition surface 3 is tangent to the first surface 2, the connection between the first surface 2 and the transition surface 3 is smoother, and the probability of the first edge 5 having an angle transition is lower, so that the crease depth corresponding to the first edge 5 is reduced during the lamination process.

[0119] In some embodiments, the first surface 2 may be a plane, the transition surface 3 may be a curved surface, and the transition surface 3 may not be tangent to the first surface 2, that is, the connection between the first surface 2 and the transition surface 3 is similar to the connection between the first surface 2 and the transition surface 3 when both the first surface 2 and the transition surface 3 are planes, and the first edge 5 has an angular change.

[0120] According to the technical solution of the embodiment of the present application, when the first surface 2 is a plane and the transition surface 3 is an arc surface, the transition surface 3 is tangent to the first surface 2, so that when the conductive block 1 is pressed against the pole lug 102, the first edge 5 and the pole lug 102 abut more smoothly, thereby reducing the risk of the pole lug 102 being damaged due to the abutment between the first edge 5 of the conductive block 1 and the pole lug 102, and also reducing the risk of the pole lug 102 warping due to the crease generated when the pole lug 102 is pressed, thereby improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery cell 105 and the battery.

[0121] Please refer to Figures 4 to 9 In some embodiments, the conductive block 1 further includes a first surface 2 and a second surface 4, wherein the first surface 2, the transition surface 3 and the second surface 4 are sequentially arranged along the circumference of the conductive block 1, the first surface 2 and the transition surface 3 intersect at a first edge 5, and the transition surface 3 and the second surface 4 intersect at a second edge 6; wherein the first edge 5 and the second edge 6 define a first reference plane 7, and the transition surface 3 is an arc surface protruding from the first reference plane 7.

[0122] In some embodiments, the intersection of two surfaces is an edge, the first edge 5 is the connection between the transition surface 3 and the first surface 2, and the second edge 6 is the connection between the transition surface 3 and the second surface 4. It should be noted that the edge is not necessarily the edge at the corner of two surfaces. For example, please refer to Figure 6 to Figure 7 When the transition surface 3 is a curved surface and the transition surface 3 is connected to and tangent to the first surface 2 , the probability of a corner being present is small, and the first edge 5 is only the connection between the transition surface 3 and the first surface 2 .

[0123] In some embodiments, the first surface 2 , the transition surface 3 , and the second surface 4 are circumferential surfaces of the conductive block 1 , and may extend along a second direction Y. In the figure, the second direction may be represented by Y.

[0124] Please refer to Figure 6 to Figure 7 . In some embodiments, the first surface 2 may be a plane, and the transition surface 3 may be a curved surface. The first edge 5 is the connection between the transition surface 3 and the first surface 2, and the second edge 6 is the connection between the transition surface 3 and the second surface 4, that is, the first edge 5 and the second edge 6 are the two ends of the transition surface 3, and the first edge 5 and the second edge 6 define a first reference plane 7, that is, the first edge 5 and the second edge 6 are both located on the first reference plane 7, and the first reference plane 7 is an imaginary virtual plane. The angle between the first reference plane 7 and the first surface 2 is an obtuse angle, and the transition surface 3 is a curved surface protruding from the first reference plane 7, that is, during the pressing process, when the first surface 2 is arranged in the horizontal direction, the transition surface 3 is a curved surface, and the overall extension trend is obliquely upward in the direction close to the main body 101 of the electrode assembly 100, so that the first edge 5 and the second edge 6 are both in contact with the pole ear 102.

[0125] In some embodiments, the first surface 2 may be a plane, and the transition surface 3 may be an arc surface. When the transition surface 3 is an arc surface, the transition surface 3 is in full or partial contact with the tab 102, so that the pressure when the conductive block 1 is pressed against the tab 102 is dispersed over a larger contact area, reducing the risk of stress concentration and damage to the tab 102 caused by only one edge of the conductive block 1 being in contact with the tab 102 when the conductive block 1 is pressed against the tab 102, and the risk of stress concentration and damage to the tab 102 caused by too small an angle corresponding to the first edge 5 of the conductive block 1 being in contact with the tab 102, and also reducing the risk of warping of the tab 102 caused by the crease generated when the tab 102 is pressed, thereby improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery cell 105 and the battery.

[0126] In some embodiments, the angle formed between the first reference plane 7 and the first surface 2 is an obtuse angle.

[0127] The technical solution of the embodiment of the present application is to perform a withstand voltage test on the electrode assembly 100 through the conductive block 1, the first surface 2 of the conductive block 1 is pressed with the pole ear 102 of the electrode assembly 100, the first surface 2 is connected to the transition surface 3 through the first edge 5, and the second surface 4 is connected to the transition surface 3 through the second edge 6. When the transition surface 3 is a plane, the angle between the transition surface 3 and the first surface 2 is an obtuse angle; when the transition surface 3 is a curved surface, the angle between the first reference plane 7 defined by the first edge 5 and the second edge 6 and the first surface 2 is an obtuse angle. When the pole lug 102 is pressed onto the first surface 2, the first edge 5 and the second edge 6 can abut against the pole lug 102, and the angle between the first reference plane 7 and the first surface 2 is an obtuse angle, thereby reducing the risk of only one edge of the conductive block 1 abutting against the pole lug 102 when the pole lug 102 is pressed onto the conductive block 1, resulting in stress concentration and thus damaging the pole lug 102, and the risk of the angle corresponding to the first edge 5 where the conductive block 1 abuts against the pole lug 102 being too small, resulting in stress concentration and damaging the pole lug 102. At the same time, it also reduces the risk of the pole lug 102 warping due to the crease generated when the pole lug 102 is pressed onto the conductive block 1, thereby improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery cell 105 and the battery.

[0128] Please refer to Figure 6 to Figure 7 In some embodiments, the angle between the first reference plane 7 and the first surface 2 is α2, which satisfies: 110°≤α2≤150°.

[0129] In some embodiments, the first surface 2 may be a plane, the transition surface 3 may be a curved surface, the first edge 5 and the second edge 6 of the transition surface 3 define a first reference plane 7, and the angle between the first surface 2 and the first reference plane 7 is α1. During the pressing process, the first surface 2 and the first reference plane 7 both extend along the second direction Y, and the first surface 2 is arranged in the horizontal direction. The extending direction of the first surface 2 and the second reference plane 8 is the observation direction, wherein, Figure 7The viewing angle direction is the same as the observation direction. In the observation direction, the first surface 2 and the first reference plane 7 are two connected straight lines, and the angle between the two straight lines is α2.

[0130] In some embodiments, α2 satisfies 110°≤α2≤150°. For example, α2 may be 110°, 112°, 114°, 116°, 118°, 120°, 122°, 124°, 126°, 128°, 130°, 132°, 134°, 136°, 138°, 140°, 142°, 144°, 146°, 148°, 150°, etc.

[0131] In some embodiments, α2 may be 135°.

[0132] In some embodiments, the angle α2 can be measured by attaching a protractor to a surface that is connected to both the first surface 2 and the transition surface 3, and drawing a straight line connecting the first edge 5 and the second edge 6 on the surface to measure the angle between the first surface 2 and the straight line. The measured angle is the angle α2 between the first surface 2 and the first reference plane 7.

[0133] In the technical solution of the embodiment of the present application, the first surface 2 is a plane, the transition surface 3 is an arc surface, and the angle α2 between the first surface 2 and the first reference plane 7 satisfies 110°≤α2≤150°. When α2≥110°, the risk of stress concentration damaging the tab 102 due to the angle corresponding to the first edge 5 where the conductive block 1 abuts the tab 102 is too small is reduced, and the risk of the tab 102 warping due to the crease generated when the tab 102 is pressed is also reduced, thereby improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery cell 105 and the battery. When α2≤150°, the risk of stress concentration damaging the tab 102 due to the angle corresponding to the second edge 6 where the conductive block 1 abuts the tab 102 is too small is reduced, and the risk of the tab 102 warping due to the crease generated when the tab 102 is pressed is also reduced, thereby improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery cell 105 and the battery.

[0134] Please refer to Figure 8. In some embodiments, both the first surface 2 and the second surface 4 can be planes. The transition surface 3 includes a plurality of sub-surfaces 19, and the plurality of sub-surfaces 19 define the transition surface 3. The first edge 5 and the second edge 6 define the first reference plane 7. The angle between the first surface 2 and the first reference plane 7 can be an obtuse angle, and the angle between the second surface 4 and the first reference plane 7 can be an obtuse angle. The plurality of sub-surfaces 19 are planes, and the angle between the sub-surface 19 closest to the first surface 2 and the first surface 2 is an obtuse angle, and the angle between the sub-surface 19 closest to the second surface 4 and the second surface 4 is an obtuse angle, and the angle between any two adjacent sub-surfaces 19 is an obtuse angle. Among them, the connection between every two adjacent sub-surfaces 19 can abut against the pole ear 102.

[0135] Please refer to Figure 6 to Figure 7 In some embodiments, the second surface 4 is a plane, the transition surface 3 is a curved surface, and the transition surface 3 is tangent to the second surface 4 .

[0136] In some embodiments, the second surface 4 may be a plane, the transition surface 3 may be a curved surface, and the transition surface 3 may be tangent to the second surface 4. When the transition surface 3 is tangent to the second surface 4, the connection between the second surface 4 and the transition surface 3 is smoother, and the probability of the second edge 6 having an angle transition is lower, so that the crease depth corresponding to the second edge 6 is reduced during the pressing process.

[0137] In some embodiments, the second surface 4 may be a plane, the transition surface 3 may be a curved surface, and the transition surface 3 may not be tangent to the second surface 4, that is, the connection between the second surface 4 and the transition surface 3 is similar to the connection between the second surface 4 and the transition surface 3 when both the second surface 4 and the transition surface 3 are planes, and the second edge 6 has an angular change.

[0138] According to the technical solution of the embodiment of the present application, when the second surface 4 is a plane and the transition surface 3 is an arc surface, the transition surface 3 is tangent to the second surface 4, so that when the conductive block 1 is pressed against the pole lug 102, the second edge 6 and the pole lug 102 abut more smoothly, thereby reducing the risk of the pole lug 102 being damaged due to the abutment between the second edge 6 of the conductive block 1 and the pole lug 102, and also reducing the risk of the pole lug 102 warping due to the crease generated when the pole lug 102 is pressed, thereby improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery cell 105 and the battery.

[0139] In some embodiments, the extended surface of the first surface 2 intersects with the extended surface of the second surface 4 .

[0140] Please refer to Figure 7In some embodiments, the extended surface of the first surface 2 may intersect with the extended surface of the second surface 4. The extended surface of the first surface 2 is the extended surface of the first surface 2 extending from the first edge 5; the extended surface of the second surface 4 is the extended surface of the second surface 4 extending from the second edge 6. The two extended surfaces intersect, that is, when the first surface 2 and the transition surface 3 extend along the second direction Y, the first surface 2 and the second surface 4 are not parallel, and the extended surface of the first surface 2 and the extended surface of the transition surface 3 intersect at the first reference line 18, which is an imaginary virtual line.

[0141] During the lamination process, the extending direction of the first surface 2 and the second surface 4 is used as the observation direction, wherein: Figure 7 The viewing angle direction is the same as the observation direction. In the observation direction, the extension surface of the first surface 2 and the extension surface of the second surface 4 are two intersecting straight lines.

[0142] Please refer to Fig. 9 In some embodiments, the extended surface of the first surface 2 and the extended surface of the second surface 4 may not intersect, and in this case, the first surface 2 and the second surface 4 are parallel to each other.

[0143] Please refer to Figure 7 In some embodiments, the extended surface of the first surface 2 is orthogonal to the extended surface of the second surface 4 .

[0144] Please refer to Figure 7 In some embodiments, the extended surface of the first surface 2 and the extended surface of the second surface 4 may be orthogonal, that is, during the pressing process, the first surface 2 is arranged in the horizontal direction and the second surface 4 is arranged in the vertical direction. The extending direction of the first surface 2 and the second surface 4 is taken as the observation direction, wherein, Figure 7 The viewing angle direction is the same as the observation direction. In the observation direction, the extension surface of the first surface 2 and the extension surface of the second surface 4 are two straight lines perpendicular to each other.

[0145] Please refer to Figure 6 to Figure 7 In some embodiments, the first surface 2 is a plane, the transition surface 3 is an arc surface, the second reference plane 8 is parallel to the first reference plane 7, and the second reference plane 8 is tangent to the transition surface 3, the distance between the first reference plane 7 and the second reference plane 8 is d1, the extended surface of the first surface 2 and the extended surface of the second surface 4 intersect at the first reference line 18, the first reference line 18 is parallel to the first reference plane 7, and the distance between the first reference line 18 and the first reference plane 7 is d2, satisfying: 0.3d2≤d1≤0.7d2.

[0146] In some embodiments, the first surface 2 may be a plane, and the transition surface 3 may be a curved surface. There is a second reference plane 8 tangent to the transition surface 3, and the second reference plane 8 is parallel to the first reference plane 7. The first reference plane 7 and the second reference plane 8 are both imaginary virtual planes. The distance between the first reference plane 7 and the second reference plane 8 is d1. The first surface 2 and the transition surface 3 extend along the second direction Y, and the first reference line 18 formed thereby is parallel to the first reference plane 7, and the distance between the first reference line 18 and the first reference plane 7 is d2, satisfying: 0.3d2≤d1≤0.7d2.

[0147] In some embodiments, the method of measuring d1 and d2 can be, on the surface connected to both the first surface 2 and the transition surface 3, draw a straight line connecting the first edge 5 and the second edge 6, take a flat plate tangent to the transition surface 3 and parallel to the straight line, measure the distance between the flat plate and the straight line, which is the size of d1. Then take two flat plates respectively attached to the first surface 2 and the second surface 4, and the two flat plates intersect, measure the distance between the flat plate tangent to the transition surface 3 and the intersection of the two flat plates, which is the size of d2.

[0148] In the technical solution of the embodiment of the present application, the first surface 2 is a plane, the transition surface 3 is an arc surface, the distance between the first reference plane 7 and the second reference plane 8 is d1, and the distance between the first reference line 18 and the first reference plane 7 is d2, which satisfies 0.3d2≤d1≤0.7d2. When d1≥0.3d2, the contact area between the transition surface 3 and the tab 102 can be increased, reducing the risk of the tab 102 being damaged by the second edge 6 of the conductive block 1 abutting against the tab 102, and also reducing the risk of the tab 102 being lifted due to the folds generated when the tab 102 is pressed, thereby improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery cell 105 and the battery. When d1≤0.7d2, the risk of the tab 102 being damaged by the excessive protrusion of the transition surface 3 from the first reference plane 7 can be reduced, and the risk of the tab 102 being damaged by the stress concentration caused by the abutment of the first edge 5 against the tab 102 can also be reduced.

[0149] Please refer to Figures 4 to 7 In some embodiments, the conductive block 1 has a third surface 9 connected to the second surface 4, the third surface 9 is parallel to the first surface 2, and the distance between the first surface 2 and the third surface 9 is d3, satisfying: 0<d3≤50mm.

[0150] In some embodiments, the conductive block 1 has a third surface 9, which is connected to the second surface 4 and parallel to the first surface 2. During the pressing of the tab 102, the first surface 2 can be arranged in the horizontal direction, the second surface 4 can be arranged in the vertical direction, and the third surface 9 can be arranged in the horizontal direction. The distance between the first surface 2 and the third surface 9 is d3, that is, the height of the conductive block 1 when the tab 102 is pressed.

[0151] In some embodiments, during the process of pressing the tab 102 , the first surface 2 can be arranged in a horizontal direction, the third surface 9 can be arranged in a horizontal direction, and the second surface 4 can be arranged obliquely upward in a direction away from the main body 101 of the electrode assembly 100 .

[0152] In some embodiments, the distance between the first surface 2 and the third surface 9 is d3, which satisfies: 0<d3≤50mm. For example, d3 can be: 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc.

[0153] In some embodiments, the distance d3 between the first surface 2 and the third surface 9 can be measured by selecting two ends of a caliper to clamp the first surface 2 and the third surface 9, and the vertical distance d3 between the first surface 2 and the third surface 9 is measured.

[0154] In the technical solution of the embodiment of the present application, the third surface 9 is connected to the second surface 4 and the third surface 9 is parallel to the second surface 4, and the distance d3 between the first surface 2 and the third surface 9 satisfies 0<d3≤50mm. When the electrode assembly 100 is subjected to a withstand voltage test, the two ends of the main body 101 of the electrode assembly 100 can be clamped by the pressing plate, and the pole ear 102 can be pressed by the conductive block 1. When d3≤50mm, the risk of interference between the conductive block 1 and the pressing plate due to excessive size can be reduced, thereby improving the convenience of pressing the pole ear 102 by the conductive block 1.

[0155] In some embodiments, 10 mm ≤ d3 ≤ 20 mm.

[0156] In some embodiments, the distance between the first surface 2 and the third surface 9 is d3, which satisfies: 10 mm ≤ d3 ≤ 20 mm. For example, d3 may be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc.

[0157] In the technical solution of the embodiment of the present application, the distance d3 between the first surface 2 and the third surface 9 satisfies 10mm≤d3≤20mm. When d3≥10mm, the conductive block 1 has a certain thickness, which is convenient for pressing the tab 102 and improves the convenience of operation. When d3≤20mm, the risk of interference between the conductive block 1 and the pressing plate due to excessive size can be better reduced, thereby improving the convenience of pressing the conductive block 1 with the tab 102.

[0158] Please refer to Fig. 9 In some embodiments, the first surface 2 is parallel to the second surface 4 , and the distance between the first surface 2 and the second surface 4 is d4 , which satisfies: 0<d4≤50mm.

[0159] In some embodiments, the second surface 4 is connected to the transition surface 3, and the second surface 4 is parallel to the first surface 2. During the pressing of the tab 102, the first surface 2 can be arranged in the horizontal direction, and the second surface 4 can also be arranged in the horizontal direction. The distance between the first surface 2 and the second surface 4 is d4, that is, the height of the conductive block 1 when the tab 102 is pressed.

[0160] In some embodiments, the distance between the first surface 2 and the second surface 4 is d4, which satisfies: 0<d4≤50mm. For example, d4 can be: 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc.

[0161] In some embodiments, the distance d4 between the first surface 2 and the second surface 4 can be measured by selecting the two ends of the caliper to clamp the first surface 2 and the second surface 4, and the vertical distance d4 measured is the distance between the first surface 2 and the third surface 9.

[0162] In the technical solution of the embodiment of the present application, the first surface 2 is parallel to the second surface 4, and the distance d4 between the first surface 2 and the second surface 4 satisfies 0<d4≤50mm. When the electrode assembly 100 is subjected to a withstand voltage test, the two ends of the main body 101 of the electrode assembly 100 can be clamped by the pressing plate, and then the tab 102 can be pressed by the conductive block 1. When d4≤50mm, the risk of the conductive block 1 interfering with the pressing plate due to its oversized size can be reduced, thereby improving the convenience of pressing the tab 102 by the conductive block 1.

[0163] In some embodiments, 10 mm ≤ d4 ≤ 20 mm.

[0164] In some embodiments, the distance between the first surface 2 and the second surface 4 is d4, which satisfies: 10 mm ≤ d4 ≤ 20 mm. For example, d4 can be: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc.

[0165] In the technical solution of the embodiment of the present application, the distance d4 between the first surface 2 and the second surface 4 satisfies 10mm≤d4≤20mm. When d4≥10mm, the conductive block 1 has a certain thickness, which is convenient for pressing the tab 102 and improves the convenience of operation. When d4≤20mm, the risk of interference between the conductive block 1 and the pressing plate due to excessive size can be better reduced, and the convenience of pressing the conductive block 1 with the tab 102 is improved.

[0166] Please refer to Figures 4 to 5 . In some embodiments, the first surface 2, the transition surface 3 and the second surface 4 can all be planes. The angle between the first surface 2 and the transition surface 3 can be an obtuse angle. During the pressing process, the first surface 2 can be arranged in the horizontal direction, the transition surface 3 can be arranged obliquely upward in the direction close to the main body 101 of the electrode assembly 100, and the second surface 4 can be arranged in the vertical direction. The conductive block 1 also has a third surface 9, a fourth surface 16 and two oppositely arranged fifth surfaces 17, one end of the third surface 9 is connected to the second surface 4, and the third surface 9 can be parallel to the first surface 2. One end of the fourth surface 16 is connected to an end of the third surface 9 away from the third surface, the fourth surface 16 can be arranged in the vertical direction, the fourth surface 16 is parallel to the second surface 4, and the other end of the fourth surface 16 is connected to an end of the first surface 2 away from the transition surface 3. Among them, the first surface 2, the transition surface 3, the second surface 4, the third surface 9 and the fourth surface 16 all extend along the second direction Y, and in this extension direction, the first surface 2, the transition surface 3, the second surface 4, the third surface 9 and the fourth surface 16 are surrounded by two oppositely arranged fifth surfaces 17.

[0167] Please refer to Figure 6 to Figure 7. In some embodiments, the first surface 2 and the second surface 4 can both be planes, and the transition surface 3 can be a curved surface. The first edge 5 and the second edge 6 of the transition surface 3 define a first reference plane 7, and the angle between the first surface 2 and the first reference plane 7 can be an obtuse angle. During the pressing process, the first surface 2 can be arranged in a horizontal direction, the transition surface 3 can be protruding from the first reference plane 7, and arranged in a direction obliquely upward in a direction close to the main body 101 of the electrode assembly 100, and the second surface 4 can be arranged in a vertical direction. The conductive block 1 also has a third surface 9, a fourth surface 16, and two fifth surfaces 17. One end of the third surface 9 is connected to the second surface 4, and the third surface 9 can be parallel to the first surface 2. One end of the fourth surface 16 is connected to an end of the third surface 9 away from the third surface, and the fourth surface 16 can be arranged in a vertical direction. The fourth surface 16 is parallel to the second surface 4, and the other end of the fourth surface 16 is connected to an end of the first surface 2 away from the transition surface 3. Among them, the first surface 2, the transition surface 3, the second surface 4, the third surface 9 and the fourth surface 16 all extend along the second direction Y. In this extension direction, the first surface 2, the transition surface 3, the second surface 4, the third surface 9 and the fourth surface 16 are surrounded by two fifth surfaces 17, and the two fifth surfaces 17 are parallel.

[0168] According to the technical solution of the embodiment of the present application, a withstand voltage test is performed on the electrode assembly 100 through the conductive block 1. When the pole ear 102 is pressed onto the first surface 2, the first edge 5 and the second edge 6 can abut against the pole ear 102, and the angle between the first surface 2 and the transition surface 3 is an obtuse angle, or the angle between the first reference plane 7 and the first surface 2 is an obtuse angle, thereby reducing the risk of stress concentration and damage to the pole ear 102 when the conductive block 1 is pressed onto the pole ear 102, and also reducing the risk of the pole ear 102 warping due to the crease generated when the pole ear 102 is pressed, thereby improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery cell 105 and the battery.

[0169] In some embodiments, the conductive block 1 may be processed in an integrally formed manner.

[0170] In some embodiments, the conductive block 1 may be made of metal material, for example, copper, iron, nickel, etc.

[0171] Please refer to Figure 10 to Figure 11 . Fig.10 This is a schematic diagram of the structure of the detection mechanism 10 provided in some embodiments of the present application. Fig.11 for Fig.10 A schematic diagram of another perspective of the detection mechanism 10. It should be noted that: Fig.11Another perspective in is a perspective with the third direction Z as the observation direction, wherein the third direction can be represented by Z, the third direction Z can be perpendicular to the second direction Y in pairs, and the third direction Z can be a direction perpendicular to the fourth surface 16. The embodiment of the present application also provides a detection mechanism 10 for a withstand voltage test of an electrode assembly 100, the detection mechanism 10 comprises a conductive block 1, a first pressing plate 11, a second pressing plate 12 and an elastic member 13 of any embodiment of the first aspect, the conductive block 1 is used to press the pole ear 102 of the electrode assembly 100, the first pressing plate 11 and the second pressing plate 12 are arranged at intervals along the first direction X, and the first pressing plate 11 and the second pressing plate 12 are used to clamp the main body 101 of the electrode assembly 100; one end of the elastic member 13 is connected to the first pressing plate 11, and the other end is connected to the conductive block 1.

[0172] In some embodiments, when pressing the tab 102, the first pressing plate 11 and the second pressing plate 12 may be spaced apart in the first direction X, and the conductive block 1 is connected to the first pressing plate 11 through the elastic member 13. One end of the main body 101 of the electrode assembly 100 is disposed on the second pressing plate 12, the first pressing plate 11 abuts against the other end of the main body 101 in the first direction X, and the first pressing plate 11 and the second pressing plate 12 jointly clamp the main body 101. The tab 102 is disposed in the horizontal direction, and the tab 102 may be a multi-layer tab 102, and the conductive block 1 presses the portion of the tab 102 close to the first pressing plate 11 in the first direction X.

[0173] In the figure, the direction indicated by the letter X may be a first direction X. In some embodiments, the first direction X may be a vertical direction.

[0174] In some embodiments, when the electrode assembly 100 is subjected to a withstand voltage test, the first pressing plate 11 and the second pressing plate 12 respectively clamp the two end surfaces of the main body 101 of the electrode assembly 100 in the first direction X, and the conductive block 1 moves close to the second pressing plate 12 along the first direction X through the deformation of the elastic member 13 until the electrode tab 102 is pressed. At this time, the conductive block 1 is connected to the external short-circuit control mechanism through an external conductive wire, so that the electrode assembly 100 is powered on and subjected to a withstand voltage test.

[0175] In some embodiments, the principle of the external short-circuit control mechanism can be that when the short-circuit control mechanism sends a high-voltage signal to the electrode assembly 100 to be tested, when the pressure holding section of the test curve of the electrode assembly 100 to be tested is inconsistent with the standard curve, it is determined that the electrode assembly 100 may be a micro-short-circuit electrode assembly 100.

[0176] In some embodiments, the elastic member 13 may be a spring.

[0177] In some embodiments, the elastic member 13 and the first pressing plate 11 may be connected by welding or bonding. The elastic member 13 and the conductive block 1 may be connected by welding or bonding.

[0178] According to the technical solution of the embodiment of the present application, the detection mechanism 10 performs a withstand voltage test on the electrode assembly 100. The detection mechanism 10 includes a first pressing plate 11, a second pressing plate 12, a conductive block 1 and an elastic member 13. The first pressing block and the second pressing block jointly clamp the main body 101 of the electrode assembly 100. The conductive block 1 is connected to the first pressing block through the elastic member 13. The conductive block 1 presses the tab 102 of the electrode assembly 100. The detection mechanism 10 performs a withstand voltage test on the electrode assembly 100, which reduces the risk of damaging the tab 102 and the risk of the tab 102 warping due to the creases caused by the conductive block 1 pressing the tab 102, thereby improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery cell 105 and the battery.

[0179] Please refer to Fig.11 In some embodiments, the conductive block 1 is constructed in two pieces, and the two conductive blocks 1 are used to press the positive electrode tab 103 and the negative electrode tab 104 of the electrode assembly 100 respectively.

[0180] In some embodiments, the number of conductive blocks 1 can be two, respectively pressing the positive electrode tab 103 and the negative electrode tab 104. The embodiment of the present application takes the positive electrode tab 103 and the negative electrode tab 104 as an example in which the positive electrode tab 103 and the negative electrode tab 104 are located at the same end of the main body 101.

[0181] The technical solution of the embodiment of the present application improves the detection efficiency and convenience by respectively pressing the positive electrode tab 103 and the negative electrode tab 104 together with two conductive blocks 1, and pressing the positive electrode tab 103 and the negative electrode tab 104 together at the same time.

[0182] Please refer to Fig.11 In some embodiments, the distance between the two conductive blocks 1 is adjustable to accommodate electrode assemblies 100 of different sizes.

[0183] In some embodiments, different electrode assemblies 100 have different sizes of their main bodies 101 in the horizontal direction, so the distance between the two conductive blocks 1 needs to be adjusted to improve the convenience of operation.

[0184] According to the technical solution of the embodiment of the present application, two conductive blocks 1 are respectively pressed together with the positive electrode tab 103 and the negative electrode tab 104. For electrode assemblies 100 of different sizes, the distances between the positive electrode tab 103 and the negative electrode tab 104 are different. By adjusting the distance between the two conductive blocks 1, electrode assemblies 100 of different sizes can be adapted to press together the positive electrode tab 103 and the negative electrode tab 104 of different distances, thereby improving the practicality and applicability of the detection mechanism 10.

[0185] Please refer to Fig.11In some embodiments, a slide bar 14 and a slider 15 are disposed on the first pressing plate 11 . The slider 15 is slidably disposed on the slide bar 14 . One end of the elastic member 13 is connected to the slider 15 , and the other end is connected to the conductive block 1 .

[0186] In some embodiments, the first pressing plate 11 is provided with a sliding rod 14. When the tab 102 is pressed, the sliding rod 14 can be arranged in the horizontal direction. The connection between the sliding rod 14 and the first pressing plate 11 can be welding. The slider 15 is arranged on the sliding rod 14. The sliding rod 14 can be regarded as a slideway extending in the horizontal direction. The slider 15 can move relative to the sliding rod 14 on the sliding rod 14. One end of the elastic member 13 is connected to the slider 15, and the other end is connected to the conductive block 1. That is, by moving the slider 15, the conductive block 1 can be moved in the horizontal direction.

[0187] In some embodiments, a buckle can be provided between the slider 15 and the slide bar 14. When the slider 15 needs to be fixed on the slide bar 14 to fix the horizontal position of the conductive block 1, the slider 15 is locked on the slide bar 14 by the buckle; when the slider 15 needs to move on the slide bar 14 to change the horizontal position of the conductive block 1, the buckle is released to allow the slider 15 to move on the slide bar 14 relative to the slide bar 14.

[0188] The technical solution of the embodiment of the present application is to set a sliding rod 14 on the first pressure plate 11, and connect the conductive block 1 to the slider 15 through the elastic member 13. The slider 15 can slide on the sliding rod 14 to adjust the distance between the two conductive blocks 1, thereby improving the applicability and practicality of the detection mechanism 10. The sliding rod 14 and the slider 15 are simple in structure, easy to obtain, and cost-saving.

[0189] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A conductive block for pressing the tabs of an electrode assembly for withstand voltage testing, characterized in that: The conductive block comprises a transition surface, and the transition surface matches the inclined surface formed after the tab is pressed together.

2. The conductive block according to claim 1, characterized in that: The conductive block further includes a first surface, the first surface is used for pressing the pole lug, and the transition surface is disposed adjacent to the first surface.

3. The conductive block according to claim 2, characterized in that: The first surface and the transition surface are both planes, and the angle formed by the first surface and the transition surface is an obtuse angle.

4. The conductive block according to claim 3, characterized in that: The angle between the first surface and the transition surface is α1, which satisfies: 110°≤α1≤150°.

5. The conductive block according to claim 2, characterized in that: The first surface is a plane, and the transition surface is a curved surface.

6. The conductive block according to claim 5, characterized in that: The transition surface is tangent to the first surface.

7. The conductive block according to any one of claims 5 to 6, characterized in that: The conductive block further includes a second surface, wherein the first surface, the transition surface and the second surface are sequentially arranged along the circumference of the conductive block, the first surface intersects with the transition surface at a first edge, and the transition surface is connected to the second surface and intersects with the second edge; The first edge and the second edge define a first reference plane, and the transition surface is an arc surface protruding from the first reference plane.

8. The conductive block according to claim 7, characterized in that: An angle formed between the first reference plane and the first surface is an obtuse angle.

9. The conductive block according to claim 8, characterized in that: An angle between the first reference plane and the first surface is α2, which satisfies: 110°≤α2≤150°.

10. The conductive block according to claim 7, characterized in that: The transition surface is tangent to the second surface.

11. The conductive block according to any one of claims 7 to 10, characterized in that: An extended surface of the first surface intersects with an extended surface of the second surface.

12. The conductive block according to claim 11, characterized in that: The extended surface of the first surface is orthogonal to the extended surface of the second surface.

13. The conductive block according to claim 11, characterized in that: The second reference plane is parallel to the first reference plane, and the second reference plane is tangent to the transition surface, the distance between the first reference plane and the second reference plane is d1, the extended surface of the first surface and the extended surface of the second surface intersect at a first reference line, the first reference line is parallel to the first reference plane, and the distance between the first reference line and the first reference plane is d2, satisfying: 0.3d2≤d1≤0.7d2.

14. The conductive block according to any one of claims 1 to 13, characterized in that: The conductive block has a third surface connected to the second surface, the third surface is parallel to the first surface, and a distance between the first surface and the third surface is d3, satisfying: 0<d3≤50mm.

15. The conductive block according to claim 14, characterized in that: 10mm≤d3≤20mm.

16. The conductive block according to any one of claims 1 to 13, characterized in that: The first surface is parallel to the second surface, and a distance between the first surface and the second surface is d4, which satisfies: 0<d4≤50mm.

17. The conductive block according to claim 16, characterized in that: 10mm≤d4≤20mm.

18. A detection mechanism for voltage resistance detection of an electrode assembly, characterized in that: include: The conductive block according to any one of claims 1 to 17, used for pressing the tab of the electrode assembly; a first pressing plate and a second pressing plate, wherein the first pressing plate and the second pressing plate are spaced apart along a first direction, and the first pressing plate and the second pressing plate are used to clamp a main body of the electrode assembly; An elastic member has one end connected to the first pressing plate and the other end connected to the conductive block.

19. The detection mechanism according to claim 18, characterized in that: The conductive blocks are structured in two pieces, and the two conductive blocks are used to press the positive electrode tab and the negative electrode tab of the electrode assembly respectively.

20. The detection mechanism according to claim 19, characterized in that: The distance between the two conductive blocks is adjustable to accommodate electrode assemblies of different sizes.

21. The detection mechanism according to claim 20, characterized in that: The first pressing plate is provided with a sliding rod and a sliding block, the sliding block is slidably provided on the sliding rod, one end of the elastic member is connected to the sliding block, and the other end is connected to the conductive block.

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