End cap assembly, battery, and battery pack

Abstract

The application discloses an end cover assembly, a battery and a battery pack. The end cover assembly comprises a cover plate, a conductive unit and a battery terminal. The cover plate comprises a first side and a second side opposite to each other, and a mounting hole penetrating through the first side and the second side. The conductive unit is arranged through the mounting hole, and has a first surface located at the first side of the cover plate and a second surface located at the second side of the cover plate, the second surface being electrically connected with an electrode assembly of the battery. The battery terminal is arranged through the mounting hole and is fixed between the conductive unit and the cover plate, and the battery terminal is electrically connected with the conductive unit. In the application, the battery terminal is fixed between the conductive unit and the cover plate, and the battery terminal is electrically connected with the conductive unit, so that the arrangement of the battery terminal widens the current-carrying channel of the conductive unit, increases the current passing area, and thus can effectively meet the high-power charging and discharging requirement of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to an end cap assembly, a battery, and a battery pack. Background Technology

[0002] A battery is a device that converts energy, such as chemical energy, into electrical energy. It is used in electrical devices (such as mobile phones and laptops), electric vehicles, aerospace, and medical equipment. As the charging and discharging rate performance requirements of electrical devices continue to increase, the battery's terminals and other conductive units need to have sufficient current-carrying capacity to meet the demands of high-current, high-efficiency transmission. However, due to limitations in the structural dimensions of the battery and its conductive units, the current current-carrying cross-sectional area of ​​the conductive units is currently relatively small, easily leading to insufficient current-carrying capacity and making it difficult to fully meet the demands of high-power charging and discharging. Summary of the Invention

[0003] In view of the above problems, this application provides an end cap assembly, a battery, and a battery pack, which can at least solve the problem that the current collector and the terminal post cannot form a firm connection structure, which will lead to high impedance and affect the power transmission efficiency of the battery.

[0004] This application provides an end cap assembly, which includes a cover plate, a conductive unit, and a battery terminal. The cover plate includes a first side and a second side facing away from each other, and a mounting hole penetrating the first side and the second side. The conductive unit passes through the mounting hole and has a first surface located on the first side of the cover plate and a second surface located on the second side of the cover plate, the second surface being electrically connected to the electrode assembly of the battery. The battery terminal passes through the mounting hole and is fixed between the conductive unit and the cover plate, and the battery terminal is electrically connected to the conductive unit.

[0005] In some embodiments, the conductive unit is a solid structure.

[0006] In some embodiments, the conductive unit is a hollow structure.

[0007] In some embodiments, the conductive unit includes a terminal post and a current collector, the terminal post passing through the mounting hole, the current collector being located on the second side of the cover plate and connected to the terminal post, the first surface being the surface of the terminal post facing away from the current collector, and the second surface being the surface of the current collector being facing away from the terminal post.

[0008] In some embodiments, the manifold has a disc surface opposite to a second side of the cover plate, and the pole is connected to the disc surface.

[0009] In some embodiments, the pole and the collector plate are coaxially arranged.

[0010] In some embodiments, the collector plate and the pole are an integral structure.

[0011] In some embodiments, a first connecting surface is formed between the top wall of the electrode post away from the collector plate and the outer peripheral wall of the electrode post, and the first connecting surface is an inclined surface.

[0012] In some embodiments, a first connecting surface is formed between the top wall of the electrode post away from the collector plate and the outer peripheral wall of the electrode post, and the first connecting surface is an arc surface.

[0013] In some embodiments, the first connecting surface is an inclined surface, and the angle R4 between the extending direction of the first connecting surface and the axial direction of the pole post is 5°-75°, and the axial direction of the pole post is parallel to the direction from the first side to the second side.

[0014] In some embodiments, the first connecting surface is an arc surface, and the angle R4 between the tangent direction of the first connecting surface and the axial direction of the pole post is 5°-75°, and the axial direction of the pole post is parallel to the direction from the first side to the second side.

[0015] In some embodiments, in the direction from the first side to the second side, the pole post sequentially includes a top surface and a bottom surface, the bottom surface is disposed facing the collector plate, the pole post is provided with a weight reduction groove, the weight reduction groove is recessed from the bottom surface toward the top surface; the collector plate is provided with a through hole, the through hole and the weight reduction groove are disposed opposite to each other and communicate with each other in the direction from the first side to the second side.

[0016] In some embodiments, the battery terminal further includes a body portion and a first bent portion. The body portion is disposed around the outer periphery of the terminal post and is electrically connected to the terminal post. The first bent portion extends from an end of the body portion in a direction away from the terminal post, and at least a portion of the first bent portion is located on a first side of the cover plate.

[0017] In some embodiments, the first bent portion bends relative to the main body and forms a bending point on the main body. In the direction from the first side to the second side, the length between the bending point and the end of the first bent portion away from the main body before bending is L1, and the length of the first bent portion before bending is L2. In the direction perpendicular to the direction from the first side to the second side, the thickness of the first bent portion before bending is T1, and the thickness of the main body is T2. The bending radius formed by the first bent portion bending relative to the main body is R1. Wherein: L1 ≥ T1. In some embodiments, the first bent portion bends relative to the main body and forms a bending point on the main body. In the direction from the first side to the second side, the length between the bending point and the end of the first bent portion away from the main body before bending is L1, and the length of the first bent portion before bending is L2. In the direction perpendicular to the direction from the first side to the second side, the thickness of the first bent portion before bending is T1, and the thickness of the main body is T2. The bending radius formed by the first bent portion bending relative to the main body is R1. Wherein: T2 ≥ T1 + 0.5 mm.

[0018] In some embodiments, the first bent portion bends relative to the main body and forms a bending point on the main body. In the direction from the first side to the second side, the length between the bending point and the end of the first bent portion away from the main body before bending is L1, and the length of the first bent portion before bending is L2. In the direction perpendicular to the direction from the first side to the second side, the thickness of the first bent portion before bending is T1, and the thickness of the main body is T2. The bending radius formed by the first bent portion bending relative to the main body is R1. Where: L2 ≥ L1 - T1.

[0019] In some embodiments, the first bent portion bends relative to the main body and forms a bending point on the main body. In the direction from the first side to the second side, the length between the bending point and the end of the first bent portion away from the main body before bending is L1, and the length of the first bent portion before bending is L2. In the direction perpendicular to the direction from the first side to the second side, the thickness of the first bent portion before bending is T1, and the thickness of the main body is T2. The bending radius formed by the first bent portion bending relative to the main body is R1. Wherein: 1.5T1≥R1≥0.5T1.

[0020] In some embodiments, the main body includes a connecting end face in the direction from the first side to the second side, and in the direction perpendicular to the direction from the first side to the second side, the connecting end face includes a connecting surface and a transition surface, the first bent portion is disposed on the connecting surface, the transition surface is closer to the pole post than the connecting surface, and a release groove is provided on the transition surface.

[0021] In some embodiments, the maximum width L3 of the release groove is 0.1 mm to 1.0 mm in a direction perpendicular to the direction from the first side to the second side.

[0022] In some embodiments, the depth D1 of the release groove is 0.1 mm to 0.8 mm in the direction from the first side to the second side.

[0023] In some embodiments, the cross-section of the release groove is arc-shaped, the cross-section is parallel to the direction from the first side to the second side, and the central axis of the pole is located on the cross-section.

[0024] In some embodiments, a weld is formed between the main body and the pole post.

[0025] In some embodiments, the main body portion has a first rounded corner near the end of the pole post. A welding groove is provided on the outer peripheral wall of the pole post, and the welding groove has a welding surface in the direction from the first side to the second side. A second rounded corner is provided between the welding surface and the outer peripheral wall of the pole post, and the first rounded corner and the second rounded corner together form a weld.

[0026] In some embodiments, the width L4 of the welding surface is 0.2 mm to 2.0 mm in a direction perpendicular to the direction from the first side to the second side.

[0027] In some implementations, the radius R3 of the first fillet is 0.1mm-0.5mm.

[0028] In some embodiments, the end cap assembly further includes a first seal for sealing at least the gap between the battery terminal and the inner wall of the mounting hole.

[0029] In some embodiments, the end cap assembly further includes an insulating gasket disposed on the second side of the cover plate and comprising a first sub-part and a second sub-part that are in contact with each other. The first sub-part is disposed between the second side of the cover plate and the collector plate. A portion of the first seal is disposed between the battery terminal and the inner wall of the mounting hole, and another portion is disposed between the battery terminal and the second side of the cover plate. At least a portion of the second sub-part is sandwiched between the second side of the cover plate and the first seal.

[0030] In some embodiments, the end cap assembly further includes an insulating gasket disposed on a second side of the cover plate and comprising a first sub-part and a second sub-part adjoining therebetween. The first sub-part is disposed between the second side of the cover plate and the current collector, the first seal is disposed between the second side of the cover plate and the battery terminal, and at least a portion of the second sub-part is sandwiched between the first seal and the battery terminal.

[0031] In some embodiments, the battery terminal further includes a second bend. The second bend extends from the end of the main body in a direction away from the terminal post, and at least a portion of the second bend is located on a second side of the cover plate. A clearance groove is provided on the side of the second bend opposite to the cover plate, the clearance groove being used to accommodate a portion of the first seal.

[0032] In some embodiments, the bending radius formed by the first bending portion bending relative to the main body portion is R2, and R2 satisfies: 1.5T2≥R2≥0.5T2.

[0033] In some embodiments, the battery terminals are fitted to the outer peripheral wall of the conductive unit.

[0034] In some embodiments, the end cap assembly further includes a second seal disposed between the second bend and the conductive unit, the second seal being used to seal the gap between the second bend and the outer peripheral wall of the conductive unit.

[0035] In some embodiments, a second connecting surface is formed at the connection between the surface of the main body facing the pole post and the surface of the second bent portion facing away from the cover plate, and the second connecting surface is an inclined surface.

[0036] In some embodiments, a second connecting surface is formed at the connection between the surface of the main body facing the pole post and the surface of the second bent portion facing away from the cover plate, and the second connecting surface is an arc surface.

[0037] In some embodiments, the second connecting surface is an inclined surface, and the angle between the extension direction of the second connecting surface and the axial direction of the pole post is 5°-75°, and the axial direction of the pole post is parallel to the direction from the first side to the second side.

[0038] In some embodiments, the second connecting surface is an arc surface, and the angle between the tangent direction of the arc surface and the axial direction of the pole post is 5°-75°, and the axial direction of the pole post is parallel to the direction from the first side to the second side.

[0039] In some embodiments, the end cap assembly further includes a first seal and an insulator. The first seal is used to seal at least the gap between the battery terminal and the inner wall of the mounting hole, and the insulator is disposed between the battery terminal and a first side of the cover plate, the insulator being used to isolate the electrical connection between the battery terminal and the cover plate.

[0040] In some embodiments, the insulating member includes a body portion and a protrusion portion, the body portion being disposed between the battery terminal and a first side of the cover plate, the protrusion portion extending from the body portion toward the terminal post, and a portion of the first sealing member being located between the battery terminal and the body portion and covering at least a portion of the protrusion portion.

[0041] In some embodiments, the insulating member includes a body portion and a protrusion portion. The body portion is disposed between the battery terminal and a first side of the cover plate. The protrusion portion extends from the body portion toward a second side of the cover plate. A portion of the first sealing member is clamped between the protrusion portion and the battery terminal, and another portion is clamped between the second side of the cover plate and the battery terminal. The opposing sides of the first sealing member in the direction from the first side to the second side are both planar.

[0042] The battery of this application includes the end cap assembly described in any of the above embodiments.

[0043] The battery pack of this application includes the battery described in any of the above embodiments.

[0044] In the end cap assembly, battery, and battery pack of the present application embodiments, the battery terminal is fixed between the conductive unit and the cover plate, and the battery terminal is electrically connected to the conductive unit. In this way, the setting of the battery terminal widens the current carrying channel of the conductive unit and increases the current flow area, thereby effectively meeting the high power charging and discharging requirements of the battery.

[0045] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0046] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a perspective view of a battery pack according to certain embodiments of this application; Figure 2 yes Figure 1 A three-dimensional schematic diagram of the battery shown; Figure 3 yes Figure 2 The diagram shown is a three-dimensional exploded view of the battery. Figure 4(a) is a cross-sectional schematic diagram of a battery according to some embodiments of this application; Figure 4(b) is a cross-sectional schematic diagram of a battery according to some other embodiments of this application; Figure 4(c) is a cross-sectional schematic diagram of a battery according to some other embodiments of this application; Figure 4(d) is a cross-sectional schematic diagram of a battery according to some other embodiments of this application; Figure 4(e) is a cross-sectional schematic diagram of a battery according to another embodiment of this application; Figure 4(f) is a cross-sectional schematic diagram of a battery according to another embodiment of this application; Figure 4(g) is a cross-sectional schematic diagram of a battery according to another embodiment of this application; Figure 4(h) is a cross-sectional schematic diagram of a battery according to another embodiment of this application; Figure 5 This is an enlarged schematic diagram of point V in Figure 4(a); Figure 6 This is an enlarged schematic diagram of point VI in Figure 4(a).

[0047] Explanation of key component symbols: 10,000 battery pack, 1,000 batteries; 100 end cap assembly; 300 cells; 200 housing; 10 Cover plate, 11 First side, 13 Second side, 15 Mounting hole; 20 Battery terminal, 21 First bend, 22 Main body, 221 Connecting end face, 2211 Connecting surface, 2212 Transition surface, 2213 Release groove, 222 First rounded corner, 223 Bending point, 23 Second bend, 2301 Clearance groove, 201 Second connecting surface; 30 Conductive unit, 31 pole post, 3101 top surface, 3105 weight reduction groove, 3107 welding surface, 3109 first connecting surface, 312 second fillet, 32 collector plate, 3201 through hole, 301 first surface, 302 second surface; 40 First seal; 50 Insulating component, 51 Body part, 52 Protrusion; 60 Second seal; 70 Insulating gasket, 71 First sub-section, 73 Second sub-section. Detailed Implementation

[0048] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0050] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0051] In this document, the term "implementation" means that a specific feature, structure, or characteristic described in connection with an implementation may be included in at least one implementation of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same implementation, nor is it a separate or alternative implementation mutually exclusive with other implementations. It will be explicitly and implicitly understood by those skilled in the art that the implementations described herein can be combined with other implementations.

[0052] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0053] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0054] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0055] In the description of the embodiments of this application, unless otherwise explicitly specified and limited, the technical terms such as "installation", "connection", "linking", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components.

[0056] A battery is a device that converts energy in the form of chemical energy into electrical energy, and can be used in electrical devices (such as mobile phones, laptops, etc.), electric vehicles, aerospace, medical equipment, etc. With the increasing demands on charge / discharge rate performance of electrical devices, the battery's terminals and other conductive units need to have sufficient current-carrying capacity to meet the requirements of high-current, high-efficiency transmission. However, limited by the structural dimensions of the battery and conductive units themselves, the current current-carrying cross-sectional area of ​​the conductive units is currently small, easily leading to insufficient current-carrying capacity and difficulty in fully meeting high-power charge / discharge requirements. To solve the above problems, this application provides an end cap assembly 100 (… Figure 2 and Figure 3 (As shown), Battery 1000 ( Figure 1 (as shown) and battery pack 10000 ( Figure 1 (As shown).

[0057] Please see Figure 1 The battery pack 10000 of the present application includes a battery 1000.

[0058] The battery pack 10000 is an integrated energy storage module formed by combining multiple batteries 1000 in a specific series-parallel configuration. Internally, the battery pack 10000 includes several batteries 1000 with matching specifications, a busbar, and a battery management system. Multiple batteries 1000 can increase the total voltage through series connection, increase the total capacity through parallel connection, or simultaneously increase both voltage and capacity through a hybrid series-parallel connection. The battery pack 10000 aggregates and outputs the electrical energy from each battery 1000, achieving a total power and total energy output that a single battery 1000 cannot reach. Each battery 1000 is the smallest energy storage unit in the battery pack 10000, and each battery 1000 independently completes its charging and discharging operations. The battery pack 10000 serves as a system-level integration carrier, achieving upgrades in energy storage scale and power supply capacity by integrating multiple batteries 1000.

[0059] Please combine Figure 2The battery 1000, as an integrated energy storage and power supply unit, is used to store, stabilize, and output electrical energy, providing continuous and stable operating power to end-user devices. Simultaneously, relying on the comprehensive protection characteristics of its external structure, the battery 1000 avoids risks such as moisture, corrosion, leakage, short circuits, and damage from external forces to internal components, thus ensuring long-term stable operation of the battery 1000 under complex working conditions, vibration, high and low temperatures, and humid and dusty environments, possessing high safety, high reliability, and long service life. The battery 1000 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, and this application does not impose any limitations on this. The casing shape of the battery 1000 includes a square rigid casing, a cylindrical casing, or a soft-pack polymer casing. Square casings are generally made of deep-drawn aluminum alloy or stainless steel, cylindrical casings are mostly made of nickel-plated steel or aluminum through stamping and edge-rolling processes, and soft-pack polymer casings are heat-sealed using an aluminum-plastic composite film. The casing 200 in the accompanying drawings of this application is shown as an example of a cylindrical casing.

[0060] Since the battery pack 10000 in this embodiment includes the battery 1000, it is understood that the battery pack 10000 includes at least the same beneficial effects as the battery 1000. Therefore, for the beneficial effects of the battery pack 10000, please refer to the beneficial effects of the battery 1000 described below.

[0061] Please see Figure 2 As shown in Figure 4, the battery 1000 of this application embodiment includes an end cap assembly 100. Specifically, in some embodiments, the battery 1000 further includes a housing 200 and a battery cell 300, with the battery cell 300 disposed within the housing 200.

[0062] The housing 200 is the external enclosure component in the sealed structure used to house the battery cell 300. The specific shape and size of the housing 200 can be determined according to the shape and size of the battery cell 300. The housing 200 is made of metal, such as aluminum, aluminum alloy, stainless steel, or nickel-plated steel. Aluminum and aluminum alloys have low density and good thermal conductivity, making them suitable for batteries 1000 that require lightweight design and heat dissipation; stainless steel has high strength and corrosion resistance, making it suitable for thin-walled, high-strength applications; nickel-plated steel is relatively inexpensive and has good weldability.

[0063] Cell 300 is the component in battery 1000 where the electrochemical reaction takes place, and the casing 200 may contain one or more cells 300. Cell 300 includes an electrode unit and tabs. In battery 1000, two tabs extend from the side of the electrode unit, namely a positive tab and a negative tab, which can be located on the same side of the electrode unit. The electrode unit includes a negative electrode, a positive electrode, and a separator. The separator is located between adjacent negative and positive electrodes to separate them. Battery 1000 mainly relies on the movement of metal ions between the positive and negative electrodes to operate. The positive and negative electrodes can be wound or stacked to form the electrode unit.

[0064] In one possible design, the negative electrode, separator, and positive electrode are sequentially stacked to form the electrode unit of the cell 300, which is a stacked structure. Furthermore, the electrode unit has gaps after formation, allowing electrolyte to enter and wet the negative and positive electrodes.

[0065] The negative electrode includes a negative current collector (e.g., copper foil) and a negative active material layer (e.g., carbon or silicon) coated on the surface of the negative current collector. The positive electrode includes a positive current collector (e.g., aluminum foil) and a positive active material layer (e.g., ternary material, lithium iron phosphate, or lithium cobalt oxide) coated on the surface of the positive current collector. A negative electrode tab is connected to the negative electrode and extends from the electrode unit, and the negative electrode tab can be directly cut from the negative current collector. Similarly, a positive electrode tab is connected to the positive electrode and extends from the electrode unit, and the positive electrode tab can be directly cut from the positive current collector.

[0066] The end cap assembly 100 is a component in the battery 1000 that covers the opening of the housing 200 to isolate the internal environment of the battery 1000 from the external environment. Specifically, the end cap assembly 100 closes the opening, so that the end cap assembly 100 and the housing 200 together form a sealed space to seal the cell 300 and the electrolyte, preventing electrolyte leakage inside the battery 1000 and ensuring the stability and safety of the battery 1000 during operation. The shape of the end cap assembly 100 can be adapted to the shape of the housing 200 to fit the housing 200. At least a portion of the end cap assembly 100 can be made of a material with a certain degree of hardness and strength, so that the end cap assembly 100 can have high structural strength, making it less prone to deformation under compression and impact, thereby improving the safety performance of the battery 1000.

[0067] In some embodiments, the height direction of the housing 200 (e.g.) Figure 2In some embodiments, the housing 200 has openings at both ends in the vertical direction, and the end cap assembly 100 is fixedly connected to the opening at one end of the housing 200, so that the housing 200 forms a closed receiving space. In other embodiments, the housing 200 has an opening in the middle part in the height direction, and the end cap assembly 100 is connected to the opening in the middle part of the housing 200, so that the housing 200 forms a closed receiving space. It should be noted that in some embodiments, the housing 200 and the end cap assembly 100 can be joined together by means of crimping, welding, riveting, and threaded connection.

[0068] Since the battery 1000 in this embodiment includes an end cap assembly 100, it is understood that the battery 1000 has at least the same beneficial effects as the end cap assembly 100. Therefore, for the beneficial effects of the battery 1000, please refer to the beneficial effects of the end cap assembly 100 described below.

[0069] Please see Figure 3 The end cap assembly 100 of this application includes a cover plate 10, a conductive unit 30, and a battery terminal 20. The cover plate 10 includes a first side 11 and a second side 13 facing away from each other, and a mounting hole 15 penetrating the first side 11 and the second side 13. The conductive unit 30 passes through the mounting hole 15 and has a first surface 301 located on the first side 11 of the cover plate 10 and a second surface 302 located on the second side 13 of the cover plate. The second surface is electrically connected to the electrode assembly of the battery 1000. The battery terminal 20 passes through the mounting hole 15 and is fixed between the conductive unit 30 and the cover plate 10, and is electrically connected to the conductive unit 30.

[0070] The cover plate 10 is a structure in the end cap assembly 100 that connects to the housing 200 and closes the opening. The cover plate 10 may be flat, and its shape and size match the opening of the housing 200. Thus, when the cover plate 10 is connected to the housing 200, it can close the opening of the housing 200, thereby enclosing the battery cell 300 within the housing 200. The cover plate 10 may be made of metallic and / or non-metallic materials. Metallic materials include, but are not limited to, aluminum alloys and steel; non-metallic materials include, but are not limited to, plastics. The first side 11 of the cover plate 10 faces the external environment, and the second side 13 of the cover plate 10 faces the battery cell 300. The mounting hole 15 is a through hole that penetrates the first side 11 and the second side 13 of the cover plate 10. In the direction X, which is perpendicular to the direction of the central axis of the mounting hole 15 (parallel to the direction Z from the first side 11 to the second side 13), the size of the mounting hole 15 is greater than or equal to the size of the pole post 31. In some embodiments, the mounting hole 15 may be a constant diameter hole, meaning that the diameter of the mounting hole 15 does not change in the Z direction from the first side 11 to the second side 13. In other embodiments, the mounting hole 15 may also be a variable diameter hole, such as a stepped hole.

[0071] In some embodiments, the cover plate 10 and the housing 200 are an integral structure, that is, the cover plate 10 and the housing 200 are a single integral structure manufactured by a one-piece molding method. This can enhance the bonding strength between the cover plate 10 and the housing 200, prevent the cover plate 10 and the housing 200 from separating during the use of the battery 1000, and thus improve the stability and reliability of the battery 1000. In other embodiments, the cover plate 10 and the housing 200 are separate structures. The cover plate 10 and the housing 200 can be joined together by a detachable connection method or a non-detachable connection method. Detachable connection methods include, but are not limited to, threaded connections and snap-fit ​​connections, while non-detachable connection methods include, but are not limited to, bonding or welding.

[0072] The conductive unit 30 is a structure that can be electrically connected to an external conductor of the battery cell 300 and battery 1000 to realize the input or output of electrical energy. The conductive unit 30 can be made of conductive materials such as copper and aluminum.

[0073] The battery terminal 20 is a structure used at least to connect the conductive unit 30 and the cover plate 10. In some embodiments of this application, the battery terminal 20 passes through the mounting hole 15 and is fixed between the conductive unit 30 and the cover plate 10, and the battery terminal 20 is electrically connected to the conductive unit 30. That is, at least a portion of the battery terminal 20 is disposed between the first surface 301 and the inner wall of the mounting hole 15, and is fixed relative to the conductive unit 30 and the cover plate 10. It should be noted that in some embodiments, the battery terminal 20 uses the same conductive metal material as the conductive unit 30, or it can use a different conductive metal material than the terminal post 31. The battery terminal 20 can also have at least a portion of its material using the same conductive metal material as the conductive unit 30.

[0074] In the end cap assembly 100 of this application embodiment, the battery terminal 20 is fixed between the conductive unit 30 and the cover plate 10, and the battery terminal 20 is electrically connected to the conductive unit 30. Thus, the setting of the battery terminal 20 widens the current carrying channel of the conductive unit 30 and increases the current flow area, thereby effectively meeting the high power charging and discharging requirements of the battery 1000.

[0075] Please refer to Figure 4(a). In some embodiments, the conductive unit 30 is a solid structure.

[0076] With this configuration, on the one hand, the conductive unit 30 is a solid structure with strong structural strength, and is not prone to breakage when the battery 1000 is subjected to external impacts and vibrations, thus effectively improving the structural stability and safety of the battery 1000; on the other hand, the conductive unit 30 is a solid structure with a large current-carrying area, which can effectively increase the current-carrying area of ​​the end cap assembly 100 and effectively meet the high-power charging and discharging requirements of the battery 1000.

[0077] Please refer to Figure 4(b). In some embodiments, the conductive unit 30 is a hollow structure.

[0078] With this design, on the one hand, the hollow structure of the conductive unit 30 can significantly reduce the amount of manufacturing materials used in the conductive unit 1000, thereby reducing the manufacturing cost of the battery 1000; on the other hand, the hollow structure of the conductive unit 30 can effectively reduce the structural weight of the conductive unit 30, which can meet the requirements of lightweight battery 1000.

[0079] Please refer to Figure 4(a). In some embodiments, the conductive unit 30 includes a terminal post 31 and a current collector 32. The terminal post 31 passes through the mounting hole 15, and the current collector 32 is located on the second side 13 of the cover plate 10 and connected to the terminal post 31. The first surface 301 is the surface of the terminal post 31 facing away from the current collector 32, and the second surface 302 is the surface of the current collector 32 facing away from the terminal post 31.

[0080] In this application, the conductive unit 30 includes a terminal 31 and a current collector 32. The terminal 31 is a conductor used to conduct current; for example, the terminal 31 can draw the current inside the battery 1000 through the first surface 301. The terminal 31 can be made of conductive materials such as copper or aluminum.

[0081] The current collector 32 may have shapes including, but not limited to, plate-like and disc-like forms. The current collector 32 may be made of the same conductive metal material as the terminal 31, or it may be made of a different conductive metal material. The current collector 32 may also have at least a portion of its material made of the same conductive metal material as the terminal 31. In some embodiments of this application, the current collector 32 is disc-shaped.

[0082] Referring to Figure 4(a), the current collector 32 can be directly electrically connected to the battery cell 300 (such as the tab of the battery cell 300) through the second surface 302. In this case, the material of the current collector 32 and the material of the tab can be made of the same conductive metal material, or they can be made of different conductive metal materials, or at least part of the material of the current collector 32 and the material of the tab can be made of the same conductive metal material.

[0083] Please refer to Figure 4(a). In some embodiments, the collector plate 32 has a plate surface opposite to the second side 13 of the cover plate 10, and the pole post 31 is connected to the plate surface.

[0084] This configuration allows the conductive unit 30 to be fixed in the mounting hole 15 without the need for other components, simplifying the structure and assembly difficulty of the battery 1000 and facilitating its production. On the other hand, the current collector 32 has a large surface area, which allows the conductive unit 30 to have a large current flow area, thereby effectively increasing the current flow area of ​​the end cover assembly 100 and meeting the high-power charging and discharging requirements of the battery 1000.

[0085] Please see Figure 3 In some embodiments, the pole post 31 and the collector plate 32 are coaxially arranged.

[0086] The terminal post 31 and the current collector 32 are coaxially arranged, and the conductive unit 30 is axially symmetrical. This arrangement ensures that the conductive unit 30 is subjected to uniform force, avoiding uneven force distribution that could cause local bending and cracking when subjected to external impacts and vibrations, thus improving the structural stability and safety of the battery 1000. On the other hand, it also ensures uniform impedance throughout the conductive unit 30, preventing excessively high local impedance and current density, thus improving the safety of the battery 1000.

[0087] Please refer to Figure 4(a). In some embodiments, the manifold 32 and the pole post 31 are an integral structure.

[0088] In some embodiments, the current collector 32 and the terminal post 31 are integrally formed. With this configuration, the terminal post 31 and the current collector 32 are directly electrically connected, which can effectively reduce the electrical connection impedance of the battery 1000. This can ensure the power transmission efficiency of the battery 1000, reduce the heat generated during the operation of the battery 1000, reduce the probability of thermal runaway, and improve the reliability and safety of the battery 1000.

[0089] It should be further noted that, in some embodiments, the manifold 32 and the pole post 31 can be formed as an integral structure by methods including but not limited to stamping and stretching, forging, and die casting. For example, when die casting is used, metal raw materials such as aluminum alloy and copper alloy are formed by high pressure casting using a die casting mold. This method allows the manifold 32 and the pole post 31 to be cast in one piece with high dimensional accuracy.

[0090] Referring to Figure 4(c), in some embodiments, the current collector 32 and the terminal post 31 can be processed into an integral structure by means including but not limited to welding, riveting, pressing, gluing, and threaded connection. This arrangement eliminates the gap between the terminal post 31 and the current collector 32, increases the current-carrying area of ​​the conductive unit 30, thereby improving the charging and discharging efficiency of the battery 1000 and meeting the high-power charging and discharging requirements of the battery 1000.

[0091] Please refer to Figure 4(d). In some embodiments, a first connecting surface 3109 is formed between the top wall of the pole post 31 away from the collector plate 32 and the outer peripheral wall of the pole post 31. The first connecting surface 3109 is an inclined surface.

[0092] In this design, the top wall of the terminal post 31 facing away from the current collector 32 is connected to the outer peripheral wall of the terminal post 31 by a chamfer. This chamfer reduces the space occupied by the edge of the terminal post 31, making the battery 1000 more compact and meeting the requirements for lightweighting and miniaturization. Furthermore, the chamfering process is more precise and controllable, which helps improve the yield rate of battery 1000 production. It should be noted that in some embodiments, the chamfer between the top wall of the terminal post 31 facing away from the current collector 32 and the outer peripheral wall of the terminal post 31 is a 45° chamfer, i.e., a C-angle.

[0093] Please refer to Figure 4(a). In some embodiments, a first connecting surface 3109 is formed between the top wall of the pole post 31 away from the collector plate 32 and the outer peripheral wall of the pole post 31. The first connecting surface 3109 is an arc surface.

[0094] The top wall of the terminal post 31 facing away from the current collector 32 is connected to the outer peripheral wall of the terminal post 31 by an arc surface. That is, the top wall of the terminal post 31 facing away from the current collector 32 and the outer peripheral wall of the terminal post 31 form a rounded corner. This design has two advantages. First, when the battery 1000 is subjected to external forces, the forces can be evenly distributed through the arc surface, thereby improving the structural stability of the battery 1000. Second, when the current passes through the arc position of the terminal post 31, there is no current tip concentration effect, which can make the current density distribution in the conductive unit 30 more uniform, avoid the uneven heating of the conductive unit 30 due to excessively high local current density, thereby extending the service life and safety of the battery 1000.

[0095] Please refer to Figure 4(d). In some embodiments, the first connecting surface 3109 is an inclined surface, and the angle R4 between the extension direction of the first connecting surface 3109 and the axial direction of the pole post 31 is 5°-75°. The axial direction of the pole post 31 is parallel to the direction from the first side 11 to the second side 13.

[0096] When R4 is less than 5°, the sharp edges of the terminal 31 cannot be eliminated, which can easily lead to current tip concentration effect and is not conducive to the safe use of battery 1000. When R4 is greater than 75°, a large amount of edge metal of the terminal 31 will be cut off, the current flow area of ​​the conductive unit 30 will be reduced, and it will be unable to meet the high power charging and discharging requirements of battery 1000.

[0097] Specifically, in the above embodiment, the angle R4 between the extension direction of the first connecting surface 3109 and the axial direction of the terminal post 31 is 5°-75°. With this setting, on the one hand, the sharp corners of the terminal post 31 are eliminated, which can avoid the current tip accumulation effect and is conducive to the safe use of the battery 1000; on the other hand, the edge metal of the terminal post 31 will not be largely removed, and the conductive unit 30 has a large current flow area, which can meet the high power charging and discharging requirements of the battery 1000.

[0098] It should be noted that, in some embodiments, the angle R4 between the extension direction of the first connecting surface 3109 and the axial direction of the pole post 31 can be any one of 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70° and 75° or any value between any two of these values.

[0099] Please refer to Figure 4(a) and Figure 6 In some embodiments, the first connecting surface 3109 is an arc surface, and the angle R4 between the tangent direction of the arc surface and the axial direction of the pole post 31 is 5°-75°. The axial direction of the pole post 31 is parallel to the direction from the first side 11 to the second side 13.

[0100] When R4 is less than 5°, the size of the arc surface is too small. When the battery 1000 is subjected to external forces, it cannot effectively disperse the force, which makes the corners of the conductive unit 30 prone to cracking. When R4 is greater than 75°, a large amount of metal at the edge of the terminal post 31 will be cut off, reducing the current flow area of ​​the conductive unit 30 and failing to meet the high-power charging and discharging requirements of the battery 1000.

[0101] Specifically, in the above embodiment, the angle R4 between the tangent direction of the arc surface and the axial direction of the electrode post 31 is 5°-75°. With this setting, on the one hand, the size of the arc surface is moderate, which can effectively disperse the force when the battery 1000 is subjected to external forces, and avoid the phenomenon of cracking at the corners of the conductive unit 30; on the other hand, the edge metal of the electrode post 31 will not be largely removed, and the conductive unit 30 has a large current-carrying area, which can meet the high-power charging and discharging requirements of the battery 1000.

[0102] It should be noted that, in some embodiments, the angle R4 between the tangent direction of the arc surface and the axial direction of the pole post 31 can be any one of 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70° and 75° or any value between any two of these values.

[0103] Please refer to Figure 4(b). In some embodiments, in the direction from the first side 11 to the second side 13, the pole post 31 sequentially includes a top surface 3101 and a bottom surface, the bottom surface being disposed towards the collector plate 32. The pole post 31 is provided with a weight reduction groove 3105, which is recessed from the bottom surface towards the top surface 3101. The collector plate 32 is provided with a through hole 3201, which is disposed opposite to and communicates with the weight reduction groove 3105 in the direction from the first side 11 to the second side 13.

[0104] The bottom surface of the conductive unit 3105 is recessed towards the top surface 3101 to form a weight-reducing groove 3105. The weight-reducing groove 3105 and the through hole 3201 on the current collector 32 are arranged opposite to each other along the direction from the first side 11 to the second side 13 and are interconnected. The arrangement of the weight-reducing groove 3105 and the through hole 3201 forms a hollow conductive unit 30. This arrangement has two advantages: firstly, the weight-reducing groove 3105 recessed from the bottom surface towards the top surface 3101 can reduce the raw material consumption of the conductive unit and reduce the production cost of the conductive unit 30; secondly, the arrangement of the weight-reducing groove 3105 and the through hole 3201 to form a hollow conductive unit 30 can effectively reduce the weight of the end cap assembly 100 and meet the lightweight requirements of the battery 1000.

[0105] Please refer to Figure 4(a) and Figure 5 In some embodiments, the battery terminal 20 further includes a body portion 22 and a first bent portion 21. The body portion 22 is disposed around the outer periphery of the terminal post 31 and is electrically connected to the terminal post 31. The first bent portion 21 bends and extends from the end of the body portion 22 in a direction away from the terminal post 31, and at least a portion of the first bent portion 21 is located on the first side 11 of the cover plate 10.

[0106] In the Z-direction from the first side 11 to the second side 13, the main body 22 includes a first end and a second end opposite to each other. The first end of the main body 22 is disposed on the same side as the first side 11, and the second end of the main body 22 is disposed on the same side as the second side 13. In this application, the main body 22 is disposed around the outer periphery of the electrode post 31 and is electrically connected to the electrode post 31, which can effectively increase the current-passing area of ​​the electrode post 31 and improve the power transmission efficiency of the battery 1000.

[0107] The first bending portion 21 bends from the end of the main body portion 22 in a direction away from the terminal post 31, and the first bending portion 21 is perpendicular or nearly perpendicular to the main body portion 22. At least a portion of the first bending portion 21 is located on the first side 11, and the first bending portion 21 is used to fix the battery terminal 20 in the mounting hole 15. In some embodiments, the first bending portion 21 and the main body portion 22 are an integral structure, for example, the first bending portion 21 and the main body portion 22 are bent from the same metal plate. In other embodiments, the first bending portion 21 and the main body portion 22 are separate structures, and the first bending portion 21 and the main body portion 22 are combined by a detachable connection or a non-detachable connection.

[0108] In some embodiments, the first bent portion 21 and the main body portion 22 are made of the same conductive metal material. In other embodiments, the first bent portion 21 and the main body portion 22 are made of different conductive metal materials. In still other embodiments, at least a portion of the first bent portion 21 and at least a portion of the main body portion 22 are made of the same conductive metal material.

[0109] Please refer to Figure 4(a). Figure 5 and Figure 6 In some embodiments, the first bending portion 21 bends relative to the main body portion 22 and forms a bending point 223 on the main body portion. In the direction Z from the first side 11 to the second side 13, the length between the bending point 223 and the end of the first bending portion 21 away from the main body portion before bending is L1, and the length of the first bending portion 21 before bending is L2. In the direction X perpendicular to the direction from the first side 11 to the second side 13, the thickness of the first bending portion 21 before bending is T1, and the thickness of the main body portion 22 is T2. The bending radius formed by the first bending portion 21 bending relative to the main body portion 22 is R1.

[0110] Please refer to Figure 4(a). Figure 5 and Figure 6 In some embodiments, the first bent portion 21 is bent relative to the main body portion 22 and a bending point 223 is formed on the main body portion 22. In the direction Z from the first side 11 to the second side 13, the length between the bending point 223 and the end of the first bent portion 21 away from the main body portion 22 before bending is L1. In the direction X perpendicular to the direction from the first side 11 to the second side 13, the thickness of the first bent portion 21 before bending is T1. The length between the bending point 223 and the end of the first bent portion 21 away from the main body portion 22 before bending is L1, and L1 satisfies L1≥T1.

[0111] It should be noted that after the first bending portion 21 bends relative to the main body portion 22, an arc surface is formed between the first bending portion 21 and the main body portion 22. The starting end of the arc surface on the side of the battery terminal 20 opposite to the pole post 31 is located on the main body portion 22, and the ending end of the arc surface is located on the first bending portion 21. The starting end of the arc surface is the bending point 223 formed by the first bending portion 21 relative to the main body portion 22.

[0112] Specifically, in the above embodiment, the length of the bending point 223 and the end of the first bending portion 21 away from the main body 22 before bending is L1, and L1≥T1. This setting ensures that the first bending portion 21 has a sufficiently long side to abut against other components, increasing the abutment area. A sufficiently long abutment area allows the bending portion to be fixed in the mounting hole 15, preventing loosening and falling off. On the other hand, it avoids problems such as breakage of the first bending portion 21 relative to the main body 22 due to stress concentration during bending, thereby improving the manufacturing yield and long-term reliability of the product.

[0113] Please refer to Figure 4(a). Figure 5 and Figure 6 In some embodiments, the first bent portion 21 is bent relative to the main body portion 22 and a bending point 223 is formed on the main body portion 22. In the Z direction from the first side 11 to the second side 13, the length between the bending point 223 and the end of the first bent portion 21 away from the main body portion 22 before bending is L1. In the X direction perpendicular to the direction from the first side 11 to the second side 13, the thickness of the first bent portion 21 before bending is T1. The length of the first bent portion 21 before bending is L2, and L2 satisfies L2≥L1-T1.

[0114] Specifically, in the above embodiment, the length of the first bent portion 21 before bending is L2, and L2≥L1-T1. This setting ensures that the first bent portion 21 has a sufficiently long bending length to abut against other components, increasing the abutment area. This sufficiently long abutment area allows the bent portion to be fixed in the mounting hole 15, preventing loosening and detachment. On the other hand, this setting ensures that the first bent portion 21 has sufficiently high structural rigidity, avoiding problems such as breakage of the first bent portion 21 relative to the main body 22 due to stress concentration during bending, thereby improving the manufacturing yield and long-term reliability of the product.

[0115] Please refer to Figure 4(a). Figure 5 and Figure 6In some embodiments, the first bending portion 21 is bent relative to the main body portion 22 and a bending point 223 is formed on the main body portion 22. In the direction Z from the first side 11 to the second side 13, the length between the bending point 223 and the end of the first bending portion 21 away from the main body portion 22 before bending is L1. In the direction X perpendicular to the direction from the first side 11 to the second side 13, the thickness of the first bending portion 21 before bending is T1, and the thickness of the main body portion 22 is T2. T1 and T2 satisfy T2≥T1+0.5mm.

[0116] In direction X, perpendicular to the direction from the first side 11 to the second side 13, the thickness of the first bent portion 21 before bending is T1, and the thickness of the second bent portion 23 is the same as the thickness of the main body portion 22, both being T2. The thickness of the first bent portion 21 before bending is T1, and the thickness of the main body portion 22 is T2, satisfying the condition: T2 ≥ T1 + 0.5 mm. When T2 satisfies the above condition, the main body portion 22 can have higher structural rigidity, is less prone to bending deformation, and ensures the overall rigidity and mechanical strength of the battery terminal 20.

[0117] Please refer to Figure 4(a). Figure 5 and Figure 6 In some embodiments, the first bent portion 21 is bent relative to the main body portion 22 and a bending point 223 is formed on the main body portion 22. In the direction Z from the first side 11 to the second side 13, the length between the bending point 223 and the end of the first bent portion 21 away from the main body portion 22 before bending is L1. In the direction X perpendicular to the direction from the first side 11 to the second side 13, the thickness of the first bent portion 21 before bending is T1. The bending radius formed by the first bent portion 21 bending relative to the main body portion 22 is R1, and R1 satisfies 1.5T1≥R1≥0.5T1.

[0118] The bending radius formed by the first bending portion 21 bending relative to the main body portion 22 is R1, and satisfies 1.5T1≥R1≥0.5T1. When the value of R1 is within the above range, on the one hand, it can avoid the problem of stress concentration that cannot be alleviated due to R1 being too small, thereby preventing the battery terminal 20 from cracking when bending and improving the molding yield of the battery terminal 20; on the other hand, it can avoid R1 being too large, which would weaken the structural rigidity and load-bearing capacity of the main body portion 22, thereby reducing the possibility of deformation of the main body portion 22 under stress.

[0119] Please refer to Figure 4(a) and Figure 5In some embodiments, in the direction Z from the first side 11 to the second side 13, the main body 22 includes a connecting end face 221. In the direction X perpendicular to the direction from the first side 11 to the second side 13, the connecting end face 221 includes a connecting surface 2211 and a transition surface 2212. The first bending portion 21 is provided on the connecting surface 2211. The transition surface 2212 is closer to the pole post 31 than the connecting surface 2211. The transition surface 2212 is provided with a release groove 2213.

[0120] The connecting end face 221 and the first side 11 are disposed on the same side, and the connecting end face 221 is the integral end face of the main body 22 used to connect with the first bent part 21. The connecting end face 221 can serve as the interface between the main body 22 and the first bent part 21. In this application, the first bent part 21 is disposed on the connecting surface 2211, and the transition surface 2212 is the area on the connecting end face 221 other than the connecting surface 2211. The connecting surface 2211 is the part of the connecting end face 221 that is farther away from the pole post 31, and the transition surface 2212 is the side of the connecting end face 221 that is closer to the pole post 31.

[0121] A release groove 2213 is disposed on the transition surface 2212. The release groove 2213 can serve as a structure for stress release and deformation compensation of the battery terminal 20. The cross-sectional shape of the release groove 2213 includes, but is not limited to, square, circular, semi-circular, and D-shaped. The release groove 2213 can be used to release the bending stress generated when the first bending portion 21 is bent, preventing cracking at the root of the first bending portion 21. On the other hand, the release groove 2213 can release the vibration and impact that the battery 1000 is subjected to during operation, thereby forming a flexible buffer area to improve the fatigue resistance of the battery 1000. In some embodiments of this application, the shape of the release groove 2213 is semi-circular, and the release groove 2213 is located at the edge of the connection between the first bending portion 21 and the main body portion 22.

[0122] Please refer to Figure 4(a). Figure 5 and Figure 6 In some embodiments, the maximum width L3 of the release groove 2213 is 0.1mm-1.0mm in the direction X perpendicular to the direction from the first side 11 to the second side 13.

[0123] If L3 is less than 0.1 mm, the maximum width of the release groove 2213 is too small, which will make it difficult for the release groove to effectively release stress and solve the problem of stress concentration, thus easily leading to cracking at the root of the first bend 21. If L3 is greater than 1.0 mm, the maximum width of the release groove 2213 is too large, which will cause the groove body of the release groove 2213 to be too wide and encroach on the area of ​​the connecting surface 2211. This will require the connecting surface 2211 to be set with a larger size, which is not conducive to the miniaturization of the battery 1000.

[0124] Specifically, in the above embodiment, the maximum width L3 of the release groove 2213 is 0.1mm-1.0mm in the direction X perpendicular to the direction from the first side 11 to the second side 13. This can effectively release the bending stress generated when the first bending part 21 is bent, and prevent the root of the first bending part 21 from cracking due to stress concentration. On the other hand, it can prevent the release groove 2213 from excessively encroaching on the area of ​​the connecting surface 2211, so that the connecting surface 2211 does not need to be set to a large size, which is conducive to the miniaturization of the battery 1000.

[0125] It should be noted that, in some embodiments, the maximum width L3 of the release groove 2213 in the direction X perpendicular to the direction from the first side 11 to the second side 13 can be any one of 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1.0mm or any value between any two of these values.

[0126] Please refer to Figure 4(a). Figure 5 and Figure 6 In some embodiments, the depth D1 of the release groove 2213 in the Z direction from the first side 11 to the second side 13 is 0.1mm-0.8mm.

[0127] When D1 is less than 0.1 mm, the depth of the release groove 2213 is too shallow, thus failing to create an effective deformation space. When the first bend 21 bends, the release groove 2213 cannot effectively deform to release the bending stress generated during bending, resulting in ineffective stress release. When D1 is greater than 0.8 mm, the depth of the release groove 2213 is too deep, leading to insufficient structural rigidity of the battery terminal 20. This causes excessive elastic deformation of the battery terminal 20 during operation, potentially leading to structural failure.

[0128] Specifically, in the above embodiment, the depth D1 of the release groove 2213 is 0.1mm-0.8mm in the direction X perpendicular to the direction from the first side 11 to the second side 13. This allows the release groove 2213 to form an effective deformation space, thereby releasing the bending stress generated when the first bending portion 21 is bent through effective deformation. Furthermore, it avoids the problem of insufficient structural rigidity in the battery terminal 20, thus ensuring the stability of the battery 1000 under external loads and improving the yield rate of battery 1000 production.

[0129] It should be noted that, in some embodiments, the depth D3 of the release groove 2213 in the Z direction from the first side 11 to the second side 13 can be any one of 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, and 0.8mm, or any value between any two of these values.

[0130] Please refer to Figure 4(a) and Figure 5 In some embodiments, the cross-section of the release groove 2213 is arc-shaped, the cross-section is parallel to the direction from the first side 11 to the second side 13, and the central axis of the pole 31 is located on the cross-section.

[0131] This design allows the stress acting on the release groove 2213 to be evenly distributed along the smooth arc surface, preventing the release groove 2213 from cracking due to stress concentration, thereby enhancing the structural stability of the battery 1000 and extending its service life.

[0132] Please refer to Figure 4(a) and Figure 5 In some embodiments, a weld is formed between the main body 22 and the pole post 31.

[0133] The weld is located between the main body 22 and the terminal post 31, and the weld is a circumferential annular groove. The weld allows the main body 22 and the terminal post 31 to be joined together by welding. For example, an external welding device can achieve electrical connection between the main body 22 and the terminal post 31 through the weld. Compared with mating, threaded connection and riveting, the metallurgical bond formed by welding makes the electrical connection between the battery terminal 20 and the terminal post 31 tighter, which helps to reduce the contact resistance between the battery terminal 20 and the terminal post 31. This reduces the heat generated during high current charging and discharging and improves the power transmission efficiency of the battery 1000.

[0134] Furthermore, a weld is formed between the main body 22 and the terminal post 31, allowing the battery terminal 20 and the conductive unit 30 to be welded by surface welding. The weld is visible, which helps to control the welding quality and avoids the problem of the welding quality not being effectively controlled due to the concealment of the weld. This reduces the electrical connection impedance between the battery terminal 20 and the conductive unit 30, which helps to adapt to the use requirements of high-power charging and discharging.

[0135] Please refer to Figure 4(a) and Figure 5In some embodiments, the end of the main body 22 near the pole post 31 is provided with a first fillet 222. The outer peripheral wall of the pole post 31 is provided with a welding groove. In the direction Z from the first side 11 to the second side 13, the welding groove has a welding surface 3107. A second fillet 312 is provided between the welding surface 3107 and the outer peripheral wall of the pole post 31. The first fillet 222 and the second fillet 312 together form a weld.

[0136] The welding groove is an annular, flat groove formed on the outer peripheral wall of the electrode post 31. A first rounded corner 222 is located at the end of the main body 22 near the electrode post 31, between the transition surface 2212 and the outer peripheral wall of the main body 22. The first rounded corner is the transition rounded corner at the end of the main body 22 of the battery terminal 20. A welding surface 3107 is provided on the welding groove, and a second rounded corner 312 is located between the welding surface 3107 and the outer peripheral wall of the electrode post 31. The first rounded corner 222 and the second rounded corner 312 are spaced apart and opposite each other, together forming a weld. This arrangement ensures that the weld contour between the electrode post 31 and the main body 22 is regular and visible, facilitating direct observation of the weld and aiding in quality control. It avoids the problem of concealed welds leading to ineffective quality control. Furthermore, the rounded corner design allows for a gentler stress distribution at both ends of the weld, enabling the battery 1000 to release some stress when subjected to external force, thus preventing weld failure.

[0137] In some embodiments, the transition surface 2212 and the welding surface 3107 are at the same height in the Z direction from the first side 11 to the second side 13. Therefore, the first fillet 222 and the second fillet 312 are at the same height in the Z direction. They are arranged at intervals on the same horizontal line to form a continuous and closed-loop annular weld.

[0138] Please refer to Figure 4(a). Figure 5 and Figure 6 In some embodiments, the width L4 of the welding surface 3107 is 0.2mm-2.0mm in the direction X perpendicular to the direction from the first side 11 to the second side 13.

[0139] In this case, the width direction of the welding surface 3107 is the same as the direction X perpendicular to the direction from the first side 11 to the second side 13. When L4 is less than 0.2mm, the welding surface 3107 will be too narrow, resulting in insufficient weld joint width and making it easy for the main body 22 to detach from the electrode post 31. When L4 is greater than 2.0mm, the welding surface 3107 will be too wide, which will weaken the electrode post 31 substrate, thereby reducing the current flow area of ​​the electrode post 31 and hindering the improvement of the power transmission efficiency of the battery 1000.

[0140] Specifically, in the above embodiment, the width L4 of the welding surface 3107 is 0.2mm-2.0mm in the direction X perpendicular to the direction from the first side 11 to the second side 13. This arrangement ensures sufficient effective bonding width between the main body 22 and the electrode post 31, and the weld is visible, which helps control welding quality and avoids problems caused by concealed welds. Furthermore, the weld does not excessively weaken the electrode post 31 substrate, ensuring a larger current-carrying area for the electrode post 31 and improving the power transmission efficiency of the battery 1000.

[0141] It should be noted that the width L4 of the welding surface 3107 can be any one of 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm and 2.0mm or any value between any two of these values.

[0142] Please refer to Figure 4(a). Figure 5 and Figure 6 In some embodiments, the radius R3 of the first fillet 222 is 0.1mm-0.5mm.

[0143] When R3 is less than 0.1mm, the weld seam will be too small, affecting welding reliability and making welding positioning difficult. When R3 is greater than 0.5mm, the weld seam will be too large, thus reducing welding efficiency and increasing welding costs.

[0144] Specifically, in the above embodiment, the radius R3 of the first fillet 222 is 0.1mm-0.5mm. This setting ensures that the weld is visible, which helps to control the welding quality and avoids the problem of ineffective quality control due to concealed welds. On the other hand, the appropriate weld size avoids problems such as incomplete welding and false welding at the weld root caused by excessively deep welds, thus improving the welding quality and helping to increase the yield rate of battery 1000 production.

[0145] It should be noted that the radius R3 of the first fillet 222 can be any one of 0.1mm, 0.2mm, 0.3mm, 0.4mm and 0.5mm or any value between any two of them.

[0146] Please refer to Figure 4(a) and Figure 5 In some embodiments, the end cap assembly 100 further includes a first seal 40, which is used at least to seal the gap between the battery terminal 20 and the inner wall of the mounting hole 15.

[0147] The first sealing element 40 is a structural component used to fill the gap between the battery terminal 20 and the mounting hole 15, thereby isolating the flow of internal and external gases and liquids and buffering assembly pressure. The material of the first sealing element 40 includes, but is not limited to, nitrile rubber and fluororubber. The cross-sectional shape of the first sealing element 40 can be a regular shape such as a triangle or a circle, or it can be an irregular shape; this application does not impose specific limitations.

[0148] Referring to Figure 4(a), in some embodiments, the end cap assembly 100 further includes an insulating gasket 70 disposed on the second side 13 of the cover plate 10 and including a first sub-part 71 and a second sub-part 73 in contact. The first sub-part 71 is disposed between the second side 13 of the cover plate 10 and the collector plate 32. A portion of the first seal 40 is disposed between the battery terminal 20 and the inner wall of the mounting hole 15, and another portion is disposed between the battery terminal 15 and the second side 13 of the cover plate 20. At least a portion of the second sub-part 73 is sandwiched between the second side 13 of the cover plate 10 and the first seal 40.

[0149] The insulating gasket 70 is a structural component used to isolate the electrical connection between the battery terminal 20 and the cover plate 10, preventing short circuits between the battery terminal 20 and the cover plate 10, and avoiding accidental conduction of the battery cell 300 through the cover plate 10. In the above embodiment, at least a portion of the second sub-part 73 of the insulating gasket 70 is sandwiched between the second side 13 of the cover plate 10 and the first sealing member 40. A portion of the first sealing member 40 is disposed between the battery terminal 20 and the cover plate 10. With this arrangement, the first sealing member 40 overlaps the second sub-part 73 in the direction from the first side 11 to the second side 13. While taking into account the insulation effect between the battery terminal 20 and the cover plate 10, the sealing performance of the end cap assembly 100 is relatively high.

[0150] Referring to Figure 4(e), in some embodiments, the end cap assembly 100 further includes an insulating gasket 70 disposed on the second side 13 of the cover plate 10 and including a first sub-part 71 and a second sub-part 73 in contact. The first sub-part 71 is disposed between the second side 13 of the cover plate 10 and the collector plate 32. A first seal 40 is disposed between the second side 13 of the cover plate 10 and the battery terminal 20. At least a portion of the second sub-part 73 is sandwiched between the first seal 40 and the battery terminal 20.

[0151] The insulating gasket 70 has the same structure and function as the insulating gasket 70 described above, and will not be repeated here. In the above embodiment, at least a portion of the second sub-part 73 of the insulating gasket 70 is sandwiched between the second side 13 of the cover plate 10 and the first sealing member 40, and at least a portion of the second sub-part 73 is sandwiched between the first sealing member 40 and the battery terminal 20. With this arrangement, the first sealing member 40 overlaps the second sub-part 73 in the direction from the second side 13 to the first side 11. While taking into account the sealing effect between the battery terminal 20 and the cover plate 10, the insulation effect of the end cap assembly 100 is better. At the same time, it can reduce the corners of the first sealing member 40, avoid stress concentration and cracking of the first sealing member 40, and improve the structural stability of the battery 1000.

[0152] Referring to Figure 4(a), in some embodiments, the battery terminal 20 further includes a second bend 23. The second bend 23 extends from the end of the main body 22 in a direction away from the terminal post 31, and at least a portion of the second bend 23 is located on the second side 13 of the cover plate 10. A relief groove 2301 is provided on the side of the second bend 23 opposite to the cover plate 10, and the relief groove 2301 is used to accommodate a portion of the first seal 40.

[0153] The second bend 23 extends from the second end of the main body 22 in a direction away from the terminal post 31, and at least a portion of the second bend 23 is located on the second side 13 of the cover plate 10. One side of the second bend 23 abuts against the collector plate 32. The second bend 23 is used to fix the battery terminal 20 in the mounting hole 15 to prevent the battery terminal 20 from shifting during the operation of the battery 1000.

[0154] The other side of the second bend 23 is opposite to the cover plate 10 and is provided with a relief groove 2301, which is used to accommodate a portion of the first seal 40. The relief groove 2301 allows at least a portion of the first seal 40 to be accommodated within the relief groove 2301 when compressed, thus releasing the internal stress generated by the compression. It also increases the contact area between the seal and the second bend 23, thereby improving the reliability of the seal. The cross-sectional shape of the relief groove 2301 includes, but is not limited to, rectangles, semicircles, and trapezoids. Specifically, in some embodiments, the cross-sectional shape of the relief groove 2301 is trapezoidal.

[0155] In this application, the first bending portion 21 bends from the end of the main body portion 22 toward the side away from the terminal post 31 and is spaced apart from the first side 11. The second bending portion 23 bends from the end of the main body portion 22 toward the side away from the terminal post 31 and is spaced apart from the second side 13. With this arrangement, the first bending portion 21 and the second bending portion 23 cooperate to clamp the cover plate 10 in the groove between the first bending portion 21 and the second bending portion 23, thereby fixing the battery terminal 20 on the cover plate 10, thereby effectively restricting the movement of the battery terminal 20 in the Z direction from the first side 11 to the second side 13.

[0156] Please refer to Figure 4(a) and Figure 6 In some embodiments, the bending radius formed by the second bending portion 23 bending relative to the main body portion 22 is R2, and R2 satisfies 1.5T2≥R2≥0.5T2.

[0157] R2 refers to the bending radius formed by the second bending portion 23 bending relative to the main body portion 22, and satisfies 1.5T2 ≥ R2 ≥ 0.5T2. When the value of R2 is within the above range, On the one hand, it can avoid the problem of excessive stress concentration caused by R2 being too small, avoid the problem of corners being easily cracked, improve the structural strength of the end cap assembly 100, and thus improve the yield rate of battery 1000 production; on the other hand, it can avoid the problem of the battery terminal 20 being too large due to R2 being too large, thus facilitating the miniaturization of battery 1000.

[0158] Please refer to Figure 4(f). In some embodiments, the battery terminal 20 is attached to the outer peripheral wall of the conductive unit 30.

[0159] With this configuration, the battery terminal 20 is directly attached to the outer peripheral wall of the conductive unit 30, which allows for a tighter electrical connection between the battery terminal 20 and the conductive unit 30. ， This can effectively increase the overcurrent area of ​​the conductive unit 30 and reduce the contact resistance between the battery terminal 20 and the conductive unit 30, thereby reducing the heat generated during high-current charging and discharging and improving the energy transfer efficiency of the battery 1000.

[0160] Referring to Figure 4(a), in some embodiments, the end cap assembly 100 further includes a second seal 60 disposed between the second bend 23 and the conductive unit 30, and the second seal 60 is used to seal the gap between the outer peripheral wall of the second bend 23 and the conductive unit 30.

[0161] The second seal 60 is sandwiched between the terminal post 31, the current collector 32, and the battery terminal 20, filling the gap between them to prevent the flow of internal and external gases and liquids, and also buffering assembly pressure. The material of the second seal 60 includes, but is not limited to, nitrile rubber and fluororubber. The material of the second seal 60 can be the same as or different from that of the first seal 40, and at least a portion of the material of the second seal 60 can be the same as at least a portion of that of the first seal 40. The cross-sectional shape of the second seal 60 can be a regular shape such as a triangle or a circle, or an irregular shape; this application does not impose specific limitations.

[0162] Please refer to Figure 4(g). In some embodiments, a second connecting surface 201 is formed at the connection between the surface of the main body 22 facing the pole post 31 and the surface of the second bend 23 facing away from the cover plate 10. The second connecting surface 201 is an inclined surface.

[0163] In this design, the surface of the main body 22 facing the terminal post 31 and the surface of the second bent portion 23 facing away from the cover plate 10 are connected by a chamfer. That is, a chamfer is formed between the surface of the main body 22 facing the terminal post 31 and the surface of the second bent portion 23 facing away from the cover plate 10. This design allows for precise and controllable processing of the chamfer, improving the yield rate of battery 1000 production. Furthermore, the chamfer can disperse the stress generated during the assembly of the battery terminals 20, and can also evenly distribute stress when the battery 1000 is subjected to external forces, thus improving the structural stability of the battery 1000. It should be noted that in some embodiments, a 45° chamfer is formed between the surface of the main body 22 facing the terminal post 31 and the surface of the second bent portion 23 facing away from the cover plate 10; that is, the chamfer between the surface of the main body 22 facing the terminal post 31 and the surface of the second bent portion 23 facing away from the cover plate 10 is a C-angle.

[0164] Please refer to Figure 4(f). In some embodiments, a second connecting surface 201 is formed at the connection between the surface of the main body 22 facing the pole post 31 and the surface of the second bent portion 23 facing away from the cover plate 10. The second connecting surface 201 is an arc surface.

[0165] The surface of the main body 22 facing the terminal post 31 and the surface of the second bent portion 23 away from the cover plate 10 are connected by an inclined surface. That is, a rounded corner is formed between the surface of the main body 22 facing the terminal post 31 and the surface of the second bent portion 23 away from the cover plate 10. With this configuration, on the one hand, when the battery 1000 is subjected to external force, the arc surface can evenly distribute the stress, thereby improving the structural stability of the battery 1000; on the other hand, the second connecting surface 201 is an arc surface, which can avoid the current tip accumulation effect caused by sharp corners, and avoid local overheating of the battery terminal 20, which could lead to local cracking, thereby improving the structural stability of the battery 1000.

[0166] Please refer to Figure 4(g). In some embodiments, the second connecting surface 201 is an inclined surface, and the angle R5 between the extension direction of the second connecting surface 201 and the axial direction of the pole post 31 is 5°-75°. The axial direction of the pole post 31 is parallel to the direction from the first side 11 to the second side 13.

[0167] When the angle R5 between the extension direction of the second connecting surface 201 and the axial direction of the pole post 31 is less than 5°, the sharp corners of the battery terminal 20 cannot be eliminated, which easily leads to current tip accumulation effect and is not conducive to the safe use of the battery 1000. When R5 is greater than 75°, a large amount of edge metal of the battery terminal 20 will be cut, resulting in a reduction of the current flow area of ​​the battery terminal 20, which will not be able to meet the high power charging and discharging requirements of the battery 1000.

[0168] Specifically, in the above embodiment, the angle R5 between the extending direction of the second connecting surface 201 and the axial direction of the terminal post 31 is 5°-75°. This configuration eliminates the sharp edges of the battery terminal 20, preventing current tip accumulation and facilitating the safe use of the battery 1000. Furthermore, it avoids excessive removal of edge metal from the battery terminal 20, allowing it to have a larger current-carrying area, thus meeting the high-power charging and discharging requirements of the battery 1000.

[0169] It should be noted that, in some embodiments, the angle R5 between the extension direction of the second connecting surface 201 and the axial direction of the pole post 31 can be any one of 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70° and 75° or any value between any two of these values.

[0170] Please refer to Figure 4(f). In some embodiments, the second connecting surface 201 is an arc surface, and the angle R5 between the tangent direction of the second connecting surface 201 and the axial direction of the pole post 31 is 5°-75°. The axial direction of the pole post 31 is parallel to the direction from the first side 11 to the second side 13.

[0171] If the size of the arc surface is too small, it cannot effectively disperse the force when the battery 1000 is subjected to external forces, which will cause the corners of the battery terminal 20 to crack easily. When R4 is greater than 75°, a large amount of edge metal of the battery terminal 20 will be cut, the current flow area of ​​the battery terminal 20 will be reduced, and it will not be able to meet the high power charging and discharging requirements of the battery 1000.

[0172] Specifically, in the above embodiment, the angle R5 between the tangent direction of the arc surface and the axial direction of the terminal 31 is 5°-75°. With this setting, on the one hand, the size of the arc surface is moderate, which can effectively disperse the force when the battery 1000 is subjected to external forces, and avoid the phenomenon of cracking at the corners of the battery terminal 20; on the other hand, the edge metal of the battery terminal 20 will not be largely removed, and the battery terminal 20 has a large current flow area, which can meet the high power charging and discharging requirements of the battery 1000.

[0173] It should be noted that, in some embodiments, the angle R5 between the tangent direction of the arc surface and the axial direction of the pole post 31 can be any one of 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70° and 75° or any value between any two of these values.

[0174] Please refer to Figure 4(a) and Figure 5 In some embodiments, the end cap assembly 100 further includes a first seal 40 and an insulator 50. The first seal 40 is used to seal at least the gap between the battery terminal 20 and the inner wall of the mounting hole 15, and the insulator 50 is disposed between the battery terminal 20 and the first side 11 of the cover plate 10, and the insulator 50 is used to isolate the electrical connection between the battery terminal 20 and the cover plate 10.

[0175] The insulating component 50 is disposed between the first side 11 and the battery terminals 20, and abuts against the first bent portion 21, the first side 11, and the first sealing component 40 of the battery terminals 20. The materials of the insulating component 50 include, but are not limited to, epoxy resin, phenolic resin, and polyimide. The insulating component 50 is used to isolate the electrical connection between the battery terminals 20 and the cover plate 10, preventing short circuits between the battery terminals 20 and the cover plate 10, and avoiding accidental conduction of the battery cell 300 through the cover plate 10. Simultaneously, the insulating component 50, in conjunction with the first sealing component 40, completes the sealing of the battery 1000.

[0176] Please refer to Figure 4(a) and Figure 5 In some embodiments, the insulating member 50 includes a body portion 51 and a protrusion 52. The body portion 51 is disposed between the battery terminal 20 and the first side 11 of the cover plate 10. The protrusion 52 extends from the body portion 51 toward the terminal post 31. A portion of the first sealing member 40 is located between the battery terminal 20 and the body portion 51 and covers at least a portion of the protrusion 52.

[0177] The cross-sectional shape of the protrusion 52 includes, but is not limited to, square, semi-circular, and irregular contours. At least one protrusion 52 is provided, and the cross-sectional shapes of the protrusions 52 can be the same or different. The protrusion 52 is disposed on the contact surface between the body portion 51 of the insulating member 50 and the first sealing member 40. The first sealing member 40 covers at least a portion of the protrusion 52. This arrangement allows the first sealing member 40 to release some of the stress generated by compression into the protrusion 52 when it is compressed, preventing the first sealing member 40 from losing its elasticity due to excessive stress. Furthermore, it increases the sealing path length between the first sealing member 40 and the insulating member 50, thereby improving the reliability of the seal. In some embodiments, only one protrusion 52 is provided, and it is disposed near the end of the cover plate 10 on the contact surface between the body portion 51 and the first sealing member 40.

[0178] Referring to Figure 4(h), in some embodiments, the insulating member 50 includes a body portion 51 and a protrusion 52. The body portion 51 is disposed between the battery terminal 20 and the first side 11 of the cover plate 10. The protrusion 52 extends from the body portion 51 toward the second side 13 of the cover plate 10. A portion of the first sealing member 40 is clamped between the protrusion 52 and the battery terminal 20, and another portion is clamped between the second side 13 of the cover plate 10 and the battery terminal 20. The opposite sides of the first sealing member 40 in the direction from the first side 11 to the second side 13 are both planar.

[0179] This design effectively reduces the corners of the first seal 40, preventing stress concentration and cracking of the first seal 40, which would cause the battery 1000 to fail to seal. This improves the structural stability of the battery 1000 and extends its service life.

[0180] Referring to Figure 4(a), in some embodiments of this application, the current collector 32 and the terminal post 31 are integrally formed to constitute a conductive unit 30 and are pre-installed in the mounting hole 15. The battery terminal 20 is fixed in the mounting hole 15, and the main body 22 abuts against the periphery of the conductive unit 30. During installation, the portion of the battery terminal 20 protruding from the first side 11 is bent away from the terminal post 31 to form a first bent portion 21, and the first bent portion 21 abuts against the insulating member 50. The insulating member 50 is disposed in the gap between the cover plate 10 and the first bent portion 21. One end of the insulating member 50 abuts against the first bent portion 21, and the other end of the insulating member 50 abuts against the first side 11 of the cover plate 10, thereby constructing a sealed space. In addition, a first sealing member 40 is disposed in the sealed space formed by the insulating member 50, the cover plate 10, and the battery terminal 20, and undergoes elastic deformation under the action of the first bent portion 21. The first sealing member 40 fills the sealed space to complete the seal. The insulating component 50 has a protrusion 52 near the cover plate 10, and the second bend 23 has a relief groove 2301. These features allow the first sealing component 40 to have a larger sealing area and a longer sealing path during the sealing process, thus improving the sealing effect of the battery 1000. The second sealing component 60 is located between the second bend 23, the terminal post 31, and the current collector 32 to isolate the flow of gas and liquid inside and outside the battery 1000, thereby providing a good working environment inside the battery 1000. One end of the insulating gasket 70 abuts against the second side 13, and the other end of the insulating gasket 70 abuts against the current collector 32, to isolate the electrical connection between the cover plate 10 and the terminal post 31.

[0181] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. This 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 battery end cap assembly, characterized in that, include: The cover plate includes a first side and a second side facing away from each other, and a mounting hole penetrating the first side and the second side; A conductive unit, the conductive unit passing through the mounting hole, the conductive unit having a first surface located on a first side of the cover plate and a second surface located on a second side of the cover plate, the second surface being electrically connected to the electrode assembly of the battery; and A battery terminal is provided through the mounting hole and fixed between the conductive unit and the cover plate, and the battery terminal is electrically connected to the conductive unit.

2. The end cap assembly according to claim 1, characterized in that, The conductive unit is a solid structure; or, The conductive unit has a hollow structure.

3. The end cap assembly according to claim 1, characterized in that, The conductive unit includes a terminal post and a current collector. The terminal post passes through the mounting hole, and the current collector is located on the second side of the cover plate and connected to the terminal post. The first surface is the surface of the terminal post facing away from the current collector, and the second surface is the surface of the current collector facing away from the terminal post.

4. The end cap assembly according to claim 3, characterized in that, The collector plate has a plate surface opposite to the second side of the cover plate, and the pole post is connected to the plate surface; and / or, The pole and the collector plate are coaxially arranged.

5. The end cap assembly according to claim 3, characterized in that, The collector plate and the pole are an integral structure.

6. The end cap assembly according to claim 5, characterized in that, A first connecting surface is formed between the top wall of the electrode post away from the collector plate and the outer peripheral wall of the electrode post; The first connecting surface is an inclined surface; or, The first connecting surface is an arc surface.

7. The end cap assembly according to claim 6, characterized in that, The first connecting surface is an inclined surface, and the angle R4 between the extending direction of the first connecting surface and the axial direction of the pole post is 5°-75°. The axial direction of the pole post is parallel to the direction from the first side to the second side; or, The first connecting surface is an arc surface, and the angle R4 between the tangent direction of the first connecting surface and the axial direction of the pole post is 5°-75°. The axial direction of the pole post is parallel to the direction from the first side to the second side.

8. The end cap assembly according to claim 3, characterized in that, In the direction from the first side to the second side, the pole post includes a top surface and a bottom surface in sequence. The bottom surface is disposed facing the collector plate. The pole post is provided with a weight reduction groove, which is formed by recessing from the bottom surface toward the top surface. The collector plate is provided with a through hole, which is disposed opposite to and communicates with the weight reduction groove in the direction from the first side to the second side.

9. The end cap assembly according to claim 3, characterized in that, The battery terminals include: The main body is disposed around the outer periphery of the electrode post and is electrically connected to the electrode post; and The first bend extends from the end of the main body in a direction away from the pole post, and at least a portion of the first bend is located on the first side of the cover plate.

10. The end cap assembly according to claim 9, characterized in that, The first bent portion bends relative to the main body and forms a bending point on the main body. In the direction from the first side to the second side, the length between the bending point and the end of the first bent portion away from the main body before bending is L1, and the length of the first bent portion before bending is L2. In the direction perpendicular to the direction from the first side to the second side, the thickness of the first bent portion before bending is T1, and the thickness of the main body is T2. The bending radius formed by the first bent portion bending relative to the main body is R1. Wherein: L1≥T1; and / or, T2≥T1+0.5mm; and / or, L2≥L1-T1; and / or, 1.5T1≥R1≥0.5T1.

11. The end cap assembly according to claim 9, characterized in that, In the direction from the first side to the second side, the main body includes a connecting end face. In the direction perpendicular to the direction from the first side to the second side, the connecting end face includes a connecting surface and a transition surface. The first bent portion is disposed on the connecting surface. The transition surface is closer to the pole post than the connecting surface. A release groove is provided on the transition surface.

12. The end cap assembly according to claim 11, characterized in that, In a direction perpendicular to the direction from the first side to the second side, the maximum width L3 of the release groove is 0.1mm-1.0mm; and / or, In the direction from the first side to the second side, the depth D1 of the release groove is 0.1mm-0.8mm; and / or, The cross-section of the release groove is arc-shaped, and the cross-section is parallel to the direction from the first side to the second side, and the central axis of the pole is located on the cross-section.

13. The end cap assembly according to claim 9, characterized in that, A weld is formed between the main body and the pole.

14. The end cap assembly according to claim 13, characterized in that, The main body has a first rounded corner at the end near the pole post; the outer peripheral wall of the pole post has a welding groove, and the welding groove has a welding surface in the direction from the first side to the second side. A second rounded corner is provided between the welding surface and the outer peripheral wall of the pole post, and the first rounded corner and the second rounded corner together form a weld.

15. The end cap assembly according to claim 14, characterized in that, In a direction perpendicular to the direction from the first side to the second side, the width L4 of the welding surface is 0.2mm-2.0mm.

16. The end cap assembly according to claim 14, characterized in that, The radius R3 of the first fillet is 0.1mm-0.5mm.

17. The end cap assembly according to claim 9, characterized in that, The end cap assembly further includes a first seal, which is used to seal at least the gap between the battery terminal and the inner wall of the mounting hole.

18. The end cap assembly according to claim 17, characterized in that, The end cap assembly further includes an insulating gasket, which is disposed on the second side of the cover plate and includes a first sub-part and a second sub-part that are in contact with each other. The first sub-part is disposed between the second side of the cover plate and the collector plate. A portion of the first sealing element is disposed between the battery terminal and the inner wall of the mounting hole, and another portion is disposed between the battery terminal and the second side of the cover plate. At least a portion of the second sub-part is sandwiched between the second side of the cover plate and the first sealing element; or, The first seal is disposed between the second side of the cover plate and the battery terminal, and at least a portion of the second sub-part is sandwiched between the first seal and the battery terminal.

19. The end cap assembly according to claim 17, characterized in that, The battery terminals also include: The second bend extends from the end of the main body in a direction away from the pole post, and at least a portion of the second bend is located on the second side of the cover plate. A clearance groove is provided on the side of the second bend opposite to the cover plate, and the clearance groove is used to accommodate a portion of the first seal.

20. The end cap assembly according to claim 19, characterized in that, The bending radius formed by the second bending portion relative to the main body portion is R2, and R2 satisfies: 1.5T2≥R2≥0.5T2.

21. The end cap assembly according to claim 19, characterized in that, The battery terminals are fitted into the outer peripheral wall of the conductive unit; or... The end cap assembly further includes a second seal, which is disposed between the second bend and the conductive unit, and is used to seal the gap between the second bend and the outer peripheral wall of the conductive unit.

22. The end cap assembly according to claim 21, characterized in that, A second connecting surface is formed at the connection between the surface of the main body facing the pole post and the surface of the second bent portion away from the cover plate; The second connecting surface is an inclined surface; or, The second connecting surface is an arc surface.

23. The end cap assembly according to claim 22, characterized in that, The second connecting surface is an inclined surface, and the angle between the extending direction of the second connecting surface and the axial direction of the pole post is 5°-75°. The axial direction of the pole post is parallel to the direction from the first side to the second side; or, The second connecting surface is an arc surface, and the angle between the tangent direction of the arc surface and the axial direction of the pole post is 5°-75°. The axial direction of the pole post is parallel to the direction from the first side to the second side.

24. The end cap assembly according to claim 1, characterized in that, The end cap assembly also includes: A first seal is used to seal at least the gap between the battery terminal and the inner wall of the mounting hole; and An insulating element is disposed between the battery terminal and the first side of the cover plate, the insulating element being used to isolate the electrical connection between the battery terminal and the cover plate.

25. The end cap assembly according to claim 24, characterized in that, The insulating member includes a body portion and a protrusion portion. The body portion is disposed between the battery terminal and a first side of the cover plate. The protrusion portion extends from the body portion toward the conductive unit. A portion of the first sealing member is located between the battery terminal and the body portion and covers at least a portion of the protrusion portion.

26. The end cap assembly according to claim 24, characterized in that, The insulating member includes a body portion and a protrusion portion. The body portion is disposed between the battery terminal and a first side of the cover plate. The protrusion portion extends from the body portion toward a second side of the cover plate. A portion of the first sealing member is clamped between the protrusion portion and the battery terminal, and another portion is clamped between the second side of the cover plate and the battery terminal. The opposite sides of the first sealing member in the direction from the first side to the second side are both planar.

27. A battery, characterized in that, include: The end cap assembly according to any one of claims 1-23.

28. A battery pack, characterized in that, include: The battery according to claim 24.

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