Battery cover plate, battery, battery pack and electrical device

Abstract

Provided in the present disclosure are a battery cover plate, a battery, a battery pack and an electrical device, belonging to the technical field of batteries. The battery cover plate comprises a cover plate body, a connecting structure being used for connecting the cover plate body and a tab of a battery. The current carrying area of the connecting structure is not less than the ratio of the current carrying capacity of the connecting structure to the current carrying coefficient of the connecting structure. The present disclosure enables the current carrying area corresponding to the cover plate body to be reasonably designed on the basis of current values of different batteries, thus helping to reduce the manufacturing cost of the cover plate body.

Description

Battery cover, battery, battery pack and electrical equipment

[0001] Cross-reference to related applications

[0002] This disclosure claims priority to Chinese Patent Application No. 202422140501.1, filed with the Chinese Patent Office on August 30, 2024, entitled “Battery Cover, Battery, Battery Pack and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, and more specifically, to a battery cover, a battery, a battery pack, and an electrical device. Background Technology

[0004] With the popularization of the new energy industry, power batteries (including lithium-ion batteries and sodium-ion batteries) have been widely used as an energy device in vehicles and other fields.

[0005] A battery includes a battery casing and a battery cover that covers the battery casing. The battery casing houses the battery cells. The battery cover generally includes a cover body, a positive terminal, a negative terminal, an upper plastic sheet, and a lower plastic sheet. The positive terminal is connected to the positive tab on the battery cell, and the negative terminal is connected to the negative tab on the battery cell. The battery current is drawn out through the positive terminal and the negative terminal, respectively.

[0006] However, the current-carrying area and overcurrent value of the aforementioned battery cover are fixed and cannot be reasonably changed according to the current value of different batteries.

[0007] Utility Model Content

[0008] The purpose of this disclosure is to provide a battery cover, a battery, a battery pack, and an electrical device that can reasonably design the current-carrying area of ​​the cover body according to the current value of different batteries, thereby designing a cover body suitable for different current values. This helps to save conductive materials used to make the cover body while meeting the conductivity performance requirements, thereby helping to reduce the manufacturing cost of the cover body.

[0009] In a first aspect, this disclosure provides a battery cover plate for mounting on the battery casing of a battery. The battery cover plate includes: a cover plate body, the cover plate body being a conductive element, the cover plate body having a connecting structure for connecting the cover plate body and the battery tabs; wherein, the current-carrying area S of the current-carrying connecting structure is not less than the ratio between the maximum overcurrent value I carried by the connecting structure and the current-carrying coefficient N of the connecting structure; wherein, I is the continuous current that the corresponding battery needs to meet, in A; N is the current-carrying coefficient of the corresponding battery cover plate, in A / mm2; and S is the minimum cross-sectional area of ​​the corresponding battery cover plate, in mm2.

[0010] In one feasible implementation, the cover plate body is a single metal component or a metal composite component.

[0011] In one feasible implementation, the current-carrying coefficient N of the connection structure is between 3 and 8 A / mm².

[0012] In one feasible implementation, when the cover plate body is a single metal component, the current carrying capacity of the connecting structure is between 3-8 A / mm²; when the cover plate body is a metal composite component, the current carrying capacity of the connecting structure is between 4-7 A / mm².

[0013] In one feasible implementation, when the cover plate body is a copper cover plate, the current carrying coefficient N1 of the connecting structure is between 5-8 A / mm2; or, when the cover plate body is an aluminum cover plate, the current carrying coefficient N2 of the connecting structure is between 3-5 A / mm2; or, when the cover plate body is a copper-aluminum composite, the current carrying coefficient N3 of the connecting structure is between 4-7 A / mm2.

[0014] In one feasible implementation, an insulating ring is further included, which is welded to the cover plate body.

[0015] In one feasible implementation, a welding surface is provided between the cover plate body and the battery tab, and the welding area of ​​the welding surface is the current-carrying area of ​​the connection structure; the welding surface is used to connect the cover plate body and the battery tab.

[0016] In one feasible implementation, the welding surface has a minimum profile line and a maximum profile line; the distance between the minimum profile line and the maximum profile line ranges from 0 to 3 mm.

[0017] In one possible implementation, the cover plate body includes a first part and a second part, the first part being connected to the side of the second part facing away from the insulating ring, the insulating ring being provided with a mounting part, the second part being mounted on the mounting part, and the first part abutting against the surface of the insulating ring.

[0018] In one feasible implementation, the insulating ring has a mounting through hole, which forms the mounting portion, and a portion of the second portion is mounted in the mounting through hole; the first portion is located on the side of the insulating ring close to the battery housing, or on the side away from the battery housing.

[0019] In one possible implementation, a connecting ring is also included for connecting the insulating ring and the battery housing.

[0020] Secondly, this disclosure provides a battery, including a battery casing and a battery cover; the battery cover is mounted on the battery casing.

[0021] In one feasible implementation, the battery cell is further included, the battery cell being located within the battery casing, and the battery cell having tabs disposed thereon.

[0022] Thirdly, this disclosure provides a battery pack, the battery pack including a battery.

[0023] Fourthly, this disclosure provides an electrical device, which includes a battery pack.

[0024] In conjunction with the above technical solutions, this disclosure provides a battery cover, a battery, a battery pack, and an electrical device. The battery cover includes a cover body, which is a conductive component. The cover body has a connecting structure for connecting the cover body and the battery's terminals. In this way, the connecting structure, acting as a terminal for current transmission, has a larger cross-sectional area than the terminal itself, effectively shortening the current transmission path and improving the battery's overcurrent capability. The current-carrying area of ​​the connection structure is not less than the ratio between the maximum overcurrent value carried by the connection structure and the current-carrying coefficient of the connection structure. This helps to avoid the problem that if the battery current is too high and the current-carrying area of ​​the cover plate is too small, the overcurrent value of the cover plate will be less than the battery current, thus preventing the battery from having insufficient current and resulting in poor power supply to the device. On the other hand, it helps to avoid the problem that if the battery current is too low and the current-carrying area of ​​the cover plate is too large, the overcurrent value of the cover plate will be greater than the battery current, leading to waste of unloaded cover plate material and increasing manufacturing costs. Therefore, this disclosure can rationally design the current-carrying area of ​​the cover plate according to different battery current values, thereby designing cover plates suitable for different current values. This helps to save conductive material used in manufacturing the cover plate while meeting its conductivity requirements, thus reducing manufacturing costs. Attached Figure Description

[0025] Figure 1 is a structural schematic diagram of the first type of battery cover provided in the embodiment of this disclosure;

[0026] Figure 2 is a top view of the first type of battery cover provided in the embodiments of this disclosure;

[0027] Figure 3 is a cross-sectional view along the AA direction of the first type of battery cover provided in the embodiment of this disclosure;

[0028] Figure 4 is a structural schematic diagram of the second type of battery cover provided in the embodiment of this disclosure;

[0029] Figure 5 is a top view of the second type of battery cover provided in the embodiments of this disclosure;

[0030] Figure 6 is a cross-sectional view along the BB direction of the second type of battery cover provided in the embodiment of this disclosure;

[0031] Figure 7 is a side view of the battery cover provided in an embodiment of this disclosure;

[0032] Figure 8 is a schematic diagram of the connection structure and welding surface of the battery cover plate provided in an embodiment of this disclosure;

[0033] Figure 9 is a structural schematic diagram of the welding surface of the battery cover provided in the embodiment of this disclosure, which has a maximum contour line and a minimum contour line.

[0034] Explanation of reference numerals in the attached drawings: 100-Battery cover plate; 110-Cover plate body; 111-First part; 112-Second part; 120-Connecting structure; 130-Insulating ring; 131-Mounting part; 132-Mounting platform; 140-Welding surface; 141-Minimum outline; 142-Maximum outline; 150-Connecting ring. Detailed Implementation

[0035] A battery includes a battery casing and a battery cover that fits over the battery casing. The battery casing houses the battery cells. In related technologies, the battery cover typically includes a cover body, a positive terminal, a negative terminal, an upper plastic sheet, and a lower plastic sheet. The positive terminal is connected to the positive tab on the battery cell, and the negative terminal is connected to the negative tab on the battery cell. The battery current is drawn out through the positive and negative terminals, respectively.

[0036] The cross-sectional area of ​​the terminals determines the current carrying capacity of the battery cover. In related technologies, the current-carrying area of ​​the terminals is too small, and the terminals cannot be made too large due to limitations in the width direction of the battery, thus restricting the current-carrying capacity of the battery cover. Furthermore, in related technologies, the current-carrying areas of the negative and positive terminals are generally designed to be fixed for different batteries, resulting in fixed overcurrent values ​​for the negative and positive terminals. This prevents reasonable adjustments based on different battery current values, fails to adequately meet the conductivity requirements of the positive and negative terminals, wastes conductive materials, and increases the manufacturing cost of the battery cover.

[0037] To address the aforementioned technical problems, this disclosure provides a battery cover, a battery, a battery pack, and an electrical device. The current-carrying area of ​​the cover body can be rationally designed according to the current value of different batteries, thereby designing a cover body suitable for different current values. This helps to save conductive materials used in manufacturing the cover body while meeting its conductivity requirements, thus reducing the manufacturing cost of the cover body.

[0038] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions in the embodiments of this disclosure will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this disclosure. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0039] Referring to Figures 1 to 6, this embodiment of the present disclosure provides a battery cover 100 for mounting on the battery casing of a battery. The battery cover 100 may include a cover body 110, which is a conductive element. The cover body 110 has a connection structure 120 for connecting the cover body 110 and the battery tabs.

[0040] In this embodiment, the conductive material of the cover plate body 110 is not limited. For example, the cover plate body 110 can be made of a single metal, a metal alloy, or a conductive non-metallic material, such as pure copper, aluminum-copper composite, or steel-aluminum composite. This embodiment does not limit this.

[0041] It should be noted that the connecting structure 120 is part of the cover plate body 110 itself, and is not a separately set structure. Therefore, it can be understood that the connecting structure 120 and the cover plate body 110 are made of the same material, that is, the connecting structure 120 is also a conductive component. The connecting structure 120 connects the cover plate body 110 and the battery tabs, thereby helping to realize the transmission of battery current.

[0042] It should be noted that the transmission of battery current can include: transmitting current from the battery to an external source, such as to a power-consuming device, whereby the battery supplies power to the device; or transmitting current from an external source, such as a charging station, to the battery, whereby the charging station charges the battery. This embodiment does not limit this aspect.

[0043] In this embodiment, the connection structure 120 directly connects the cover plate body 110 and the battery tabs. Thus, compared to related technologies where terminals are set on the battery cover plate 100 and connected to the tabs to achieve current transmission, this disclosure replaces the terminals with the cover plate body 110, and transmits current through the connection structure 120 on the cover plate body 110. Since the cross-sectional area of ​​the cover plate body 110 is larger than the area of ​​the terminals and its length is shorter than the length of the terminals, its resistance is lower, thereby effectively shortening the current transmission path and improving the battery's overcurrent capability.

[0044] In addition, in this embodiment, the cover plate body 110 is used as the terminal post. Compared with the structure of the battery cover plate 100 in the related art, this disclosure can eliminate the terminal post, lower plastic sheet and upper plastic sheet and other components. The battery cover plate 100 of this disclosure has fewer parts, which helps to avoid the problem of battery cover plate 100 failure due to component failure, improves the reliability of battery cover plate 100, and helps to simplify the manufacturing process of battery cover plate 100.

[0045] To further design a cover plate body 110 suitable for different current values ​​while satisfying the conductivity performance of the cover plate body 110, in this embodiment of the present disclosure, the current-carrying area S of the connecting structure 120 is not less than the ratio between the maximum overcurrent value I of the connecting structure 120 and the current-carrying coefficient N of the connecting structure 120.

[0046] Where I is the continuous current required by the corresponding battery, in A; N is the current carrying capacity of the corresponding battery cover, in A / mm2; and S is the minimum cross-sectional area of ​​the corresponding battery cover, in mm2.

[0047] In this embodiment, the maximum overcurrent value of the connection structure 120 is the maximum current value of the battery when the continuous charging and discharging time needs to be greater than or equal to a preset time, expressed in amperes (A). The preset time is not limited and can be set according to actual needs. That is, the maximum overcurrent value is the continuous current that the corresponding battery needs to meet. It should be noted that the maximum overcurrent value is determined by the specific battery during design. Different batteries will have corresponding maximum overcurrent values ​​incorporated during design. In other words, the maximum overcurrent value of the battery is not a fixed value, but rather is determined during the design and testing process based on a combination of factors such as battery type, specifications, usage conditions, and safety considerations.

[0048] For example, a 50A battery that meets the 4C requirement has a maximum overcurrent value of I = 200A. Here, C refers to the battery's charge / discharge rate. In this embodiment, the current-carrying capacity of the connection structure 120 is the maximum current that a unit area of ​​the cover plate body 110 can carry, expressed in A / mm². The current-carrying capacity varies depending on the material of the cover plate body 110.

[0049] The current-carrying area of ​​the connection structure 120 is obtained by dividing the maximum overcurrent value of the connection structure 120 by the current-carrying coefficient of the connection structure 120. The unit of the current-carrying area is mm2. Different current-carrying areas can be obtained for different maximum overcurrent values ​​of different batteries.

[0050] This design serves two purposes. First, it helps to avoid the problem that if the battery current is too high and the current-carrying area of ​​the cover plate body 110 is too small, the overcurrent value of the cover plate body 110 will be less than the battery current value and thus unable to carry the full current of the battery. This avoids the problem that the battery's power supply capacity to the electrical device will be poor because the battery current cannot be fully drawn out. Second, it helps to avoid the problem that if the battery current is too low and the current-carrying area of ​​the cover plate body 110 is too large, the overcurrent value of the cover plate body 110 will be greater than the battery current value, resulting in waste of the cover plate body 110 that has not carried the current. This avoids wasting the conductive material used to make the cover plate body 110 and reduces the manufacturing cost of the cover plate body 110.

[0051] Therefore, the battery cover 100 provided in this embodiment can reasonably design the current-carrying area of ​​the cover body 110 according to the current value of different batteries, thereby designing a cover body 110 suitable for different current values. This helps to save conductive materials used to make the cover body 110 while meeting the conductivity performance of the cover body 110, thereby helping to reduce the manufacturing cost of the cover body 110.

[0052] In one feasible implementation, the cover body 110 can be a single metal component.

[0053] It should be noted that "metal monolith" refers to the cover plate body 110 being made of the same metal material. In this embodiment, the specific material of the cover plate body 110 is not limited. For example, the material of the cover plate body 110 can be pure copper, pure aluminum, etc. As long as it has conductive properties and connects the cover plate body 110 and the battery tabs, it falls within the protection scope of this disclosure.

[0054] In one feasible implementation, the cover body 110 can be a copper cover plate, that is, the cover body 110 is made of copper, and the current carrying capacity N1 of the connecting structure 120 is between 5-8 A / mm². For example, the current carrying capacity N1 of the connecting structure 120 can be 5 A / mm², 6 A / mm², 7 A / mm², 8 A / mm², or any value between 5-8 A / mm².

[0055] In this embodiment, the current carrying capacity N1 of the copper cover plate is set to 5 as an example. For example, a 50A battery that meets the 4C requirement has a maximum current value of I1 = 200A. When the cover plate body 110 is made of copper, the current carrying area S1 of the copper cover plate is ≥ 200 / 5 = 40mm2.

[0056] In one feasible implementation, the cover body 110 can be an aluminum cover plate, that is, the cover body 110 is made of aluminum, and the current carrying capacity N2 of the connecting structure 120 is between 3-5 A / mm2. Exemplarily, the current carrying capacity N2 of the connecting structure 120 can be 3 A / mm2, 3.5 A / mm2, 4 A / mm2, 5 A / mm2, or any value between 3-5 A / mm2.

[0057] In this embodiment, the current carrying capacity N2 of the aluminum cover plate is taken as 3 as an example. For example, for a 50A battery that meets the 4C requirement, the maximum current value of the battery is I2 = 200A. When the cover plate body 110 is made of aluminum, the current carrying area S2 of the aluminum cover plate is ≥ 200 / 3 = 67mm2.

[0058] In one feasible implementation, the cover body 110 can be a metal composite.

[0059] It should be noted that metal composite refers to the cover plate body 110 being made of different metal composites. In this embodiment, the specific composite material of the cover plate body 110 is not limited. For example, the material of the cover plate body 110 can be copper-aluminum composite or steel-aluminum composite, and this embodiment does not limit this. As long as it has conductive properties and connects the cover plate body 110 and the battery electrode, it falls within the protection scope of this disclosure.

[0060] In one feasible implementation, the cover body 110 can be a copper-aluminum composite, that is, the cover body 110 is made of copper-aluminum composite material, and the current carrying capacity N3 of the connecting structure 120 is between 4-7 A / mm². For example, the current carrying capacity N3 of the connecting structure 120 can be 4 A / mm², 5 A / mm², 6 A / mm², 7 A / mm², or any value between 4-7 A / mm².

[0061] In this embodiment, the current carrying capacity N3 of the copper-aluminum composite component is set to 4 as an example. For example, a 50A battery that meets the 4C requirement has a maximum current value of I3 = 200A. When the cover body 110 is made of copper-aluminum composite cover, the current carrying area S3 of the copper-aluminum composite cover is ≥ 200 / 4 = 50mm2.

[0062] In one possible implementation, referring to Figures 1 to 6, the battery cover 100 may include an insulating ring 130, which is welded to the cover body 110.

[0063] In this embodiment, the insulating ring 130 is disposed around the outer periphery of the cover plate body 110. It should be noted that the connection method between the insulating ring 130 and the cover plate body 110 includes, but is not limited to, welding. For example, the connection method between the insulating ring 130 and the cover plate body 110 can also be achieved by hot melting, adhesive bonding, etc., and the welding can be brazing.

[0064] In this embodiment, the material of the insulating ring 130 is not limited. For example, the insulating ring 130 can be made of insulating materials such as plastic, ceramic, or tempered glass, or materials with weak conductivity. This embodiment does not limit this; the material can be selected according to actual needs.

[0065] By incorporating an insulating ring 130, which serves as a sealing material and is typically used between the positive and negative terminals of a battery, it helps to isolate conductive materials, preventing short circuits and leakage between the positive and negative terminals, thereby contributing to extending the battery's lifespan.

[0066] In this embodiment of the disclosure, referring to Figures 8 and 9, a welding surface 140 may be provided between the cover plate body 110 and the battery tab, and the welding area of ​​the welding surface 140 is the current-carrying area of ​​the connection structure 120; the welding surface 140 is used to connect the cover plate body 110 and the battery tab.

[0067] It should be noted that the welding surface 140 can be seen as the shaded area in Figure 8. It can be understood that the welding surface 140 is a complete plane with a complete welding outline. The welding outline is the edge line of the shaded area in Figure 8, which can also be called the boundary line.

[0068] Since the welding surface 140 has a specific shape, its welding area can be calculated using a formula, thus allowing the determination of the current-carrying area of ​​the connecting structure 120. For example, if the welding surface 140 is a regular rectangle, the area calculation formula for a rectangle can be used; or, if the welding surface 140 is a regular circle, the area calculation formula for a circle can be used. This embodiment does not limit this specific case.

[0069] Furthermore, since welding tolerances are easily generated during the welding process, in this embodiment, the welding surface 140 may have a minimum contour line 141 and a maximum contour line 142. It should be noted that the maximum contour line 142 is the outermost contour line of the ring width, and the minimum contour line 141 is the innermost contour line of the ring width. This effectively prevents the weld point from not falling within the area of ​​the welding surface 140 due to displacement deviation during welding, thereby ensuring the welding seal and welding strength between the insulating ring 130 and the cover plate body 110, and ensuring the effective connection and current carrying capacity of the cover plate body 110.

[0070] In this embodiment of the disclosure, the spacing between the minimum contour line 141 and the maximum contour line 142 can be between 0 and 3 mm.

[0071] For example, referring to FIG9, the spacing X between the minimum outline 141 and the maximum outline 142 along the width direction of the cover plate body 110 can be set to 0mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm or any value between 0 and 3mm, depending on actual needs. In this embodiment, a spacing X of 1mm is mainly used as an example for explanation.

[0072] For example, referring to FIG9, the distance Y between the minimum outline 141 and the maximum outline 142 along the length direction of the cover plate body 110 can be set to 0mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm or any value between 0 and 3mm, depending on actual needs. In this embodiment, the distance Y of 1mm is mainly used as an example for explanation.

[0073] In one feasible implementation, as shown in Figures 1, 4 and 7, the cover plate body 110 may include a first part 111 and a second part 112. The first part 111 is connected to the side plate of the second part 112 facing away from the insulating ring 130. The insulating ring 130 is provided with a mounting part 131. The second part 112 is mounted on the mounting part 131. The first part 111 abuts against the surface of the insulating ring 130.

[0074] In this embodiment, the connection method of the first part 111 and the second part 112 is not limited. For example, the first part 111 and the second part 112 can be an integral structure, or they can be formed by multiple processing and assembly. In this embodiment, the first part 111 and the second part 112 are mainly used as an integral structure for explanation, which helps to improve the structural strength of the cover plate body 110.

[0075] In one feasible embodiment, referring to Figures 1 and 4, the insulating ring 130 may have a mounting through hole forming a mounting portion 131, into which a portion of the second portion 112 is mounted. This helps to improve the assembly strength and installation stability between the cover plate body 110 and the insulating ring 130.

[0076] In this embodiment of the present disclosure, referring to FIG4, the first part 111 may be located on the side of the insulating ring 130 near the battery casing, and the cover plate body 110 is connected to the battery tabs through the first part 111; or, in this embodiment of the present disclosure, referring to FIG1, the first part 111 may be located on the side away from the battery casing, and the cover plate body 110 is connected to the battery tabs through the second part 112. This embodiment does not limit the scope of the present disclosure.

[0077] For example, as shown in FIG1, when the first part 111 is located on the side away from the battery housing, a mounting platform 132 may be provided on the insulating ring 130. The mounting platform 132 surrounds the outer periphery of the mounting through hole, and the first part 111 abuts against the surface of the mounting platform 132. This helps to further improve the assembly strength and installation stability between the cover plate body 110 and the insulating ring 130.

[0078] In one possible implementation, referring to FIG1 and FIG6, a connecting ring 150 may also be included for connecting to the insulating ring 130 and the battery housing. Exemplarily, the connector may be a metal ring, such as an aluminum ring.

[0079] In this embodiment of the disclosure, the function of the connecting ring 150 is as follows: Since the welding temperature of the insulating ring 130, such as the steel insulating ring 130, is relatively high, if the insulating ring 130 is directly welded to the battery casing, it is easy to affect the battery casing. The welding temperature of the connecting ring 150, such as the aluminum ring, is lower than that of the insulating ring 130. In this way, the insulating ring 130 and the connecting ring 150 are first welded at a high temperature, and then the connecting ring 150 and the battery casing are welded at a low temperature, which helps to avoid the problem of affecting the battery casing.

[0080] In this embodiment, the thickness of the connecting ring 150 can be the same as the edge thickness of the battery casing. This ensures both the reliability and stability of the battery casing connection, and helps improve the sealing performance of the battery, thus preventing leakage.

[0081] This disclosure provides a battery and a battery pack, wherein the battery pack includes batteries, and the number of batteries is not limited. For example, there can be multiple batteries connected in series to form a battery pack; or, multiple batteries connected in parallel to form a battery pack. This embodiment does not limit this.

[0082] The battery includes a battery casing, a battery cell, and a battery cover plate 100. The battery cover plate 100 is installed on the battery casing, the battery cell is located in the battery casing, and the battery cell is provided with tabs.

[0083] In this embodiment, the battery cell can be a lithium battery cell, a sodium battery cell, or an energy storage battery cell. The battery casing can be an aluminum casing. This embodiment does not limit this.

[0084] In this embodiment of the present disclosure, the tabs include a positive tab and a negative tab, which are respectively connected to opposite sides of the battery cell. The battery cover 100 includes a positive cover plate and a negative cover plate, which are installed on opposite sides of the battery casing.

[0085] The positive and negative electrode cover plates each have a connecting structure 120. The positive electrode cover plate is welded to the positive electrode tab via the connecting structure 120, and the negative electrode cover plate is welded to the negative electrode tab via the connecting structure 120. This facilitates the connection between the battery cell and the battery cover plate 100 to form a battery.

[0086] This disclosure provides an electrical device in which a battery is used to provide electrical energy.

[0087] The electrical equipment in this embodiment can be a vehicle, such as a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle, and a new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Accordingly, the electrical equipment can be the vehicle's drive mechanism or the vehicle's control system.

[0088] In addition, electrical equipment can also serve as other energy storage devices, such as mobile phones, portable devices, laptops, electric toys, power tools, ships, and spacecraft. Among these, spacecraft can include airplanes, rockets, space shuttles, or spacecraft.

[0089] Since the electrical device in this embodiment includes the battery described in any of the above embodiments, the structure and beneficial effects of the electrical device including the battery will not be described in detail here.

[0090] Therefore, the present disclosure provides a battery cover, a battery, a battery pack, and an electrical device, which can reasonably design the current-carrying area of ​​the cover body according to the current value of different batteries, thereby designing a cover body suitable for different current values. This helps to save conductive materials used to make the cover body while meeting the conductivity performance of the cover body, thereby helping to reduce the manufacturing cost of the cover body.

[0091] It should be noted that, in the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0092] In the description of the embodiments of this disclosure, the term "and / or" merely indicates a relationship describing the associated objects, meaning 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 term "at least one" indicates any combination of at least two of a plurality of options, for example, including at least one of A, B, and C, which can represent any one or more elements selected from a set including communication between A, B, and C.

[0093] In the description of the embodiments of this disclosure, the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure 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 this disclosure. Furthermore, the term "a plurality of" means two or more, unless otherwise precisely specified.

[0094] In the description of embodiments of this disclosure, the terms “first,” “second,” “third,” “fourth,” etc. (if present) are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure 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. Such 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 disclosure.

Claims

1. A battery cover, characterized in that, For mounting on a battery casing, the battery cover includes: The cover plate body (110) is a conductive component and has a connection structure (120) for connecting the cover plate body (110) and the battery tabs. Wherein, the current-carrying area S of the connection structure (120) is not less than the ratio between the maximum overcurrent value I of the connection structure (120) and the current-carrying coefficient N of the connection structure (120); Where I is the continuous current required by the corresponding battery, in A; N is the current carrying capacity of the corresponding battery cover, in A / mm2; and S is the minimum cross-sectional area of ​​the corresponding battery cover, in mm2.

2. The battery cover according to claim 1, characterized in that, The cover plate body (110) is a single metal component or a metal composite component.

3. The battery cover according to claim 2, characterized in that, The current carrying capacity N of the connection structure (120) is between 3-8 A / mm2.

4. The battery cover according to claim 3, characterized in that, When the cover plate body (110) is a single metal component, the current carrying capacity of the connecting structure (120) is between 3-8 A / mm2; When the cover plate body (110) is a metal composite, the current carrying capacity of the connecting structure (120) is between 4-7 A / mm2.

5. The battery cover according to claim 4, characterized in that, When the cover plate body (110) is a copper cover plate, the current carrying coefficient N1 of the connecting structure (120) is between 5-8 A / mm2; Alternatively, when the cover plate body (110) is an aluminum cover plate, the current carrying coefficient N2 of the connecting structure (120) is between 3-5 A / mm2; Alternatively, when the cover plate body (110) is a copper-aluminum composite, the current carrying capacity N3 of the connecting structure (120) is between 4-7 A / mm2.

6. The battery cover according to any one of claims 1-5, characterized in that, It also includes an insulating ring (130), which is welded to the cover plate body (110).

7. The battery cover according to any one of claims 1-5, characterized in that, The cover plate body (110) and the battery tab have a welding surface (140), the welding area of ​​the welding surface (140) is the current carrying area of ​​the connection structure (120); the welding surface (140) is used to connect the cover plate body (110) and the battery tab.

8. The battery cover according to claim 7, characterized in that, The welding surface (140) has a minimum contour line (141) and a maximum contour line (142); the distance between the minimum contour line (141) and the maximum contour line (142) is between 0-3 mm.

9. The battery cover according to claim 6, characterized in that, The cover plate body (110) includes a first part (111) and a second part (112). The first part (111) is connected to the side of the second part (112) facing away from the insulating ring (130). The insulating ring (130) is provided with a mounting part (131). The second part (112) is mounted on the mounting part (131). The first part (111) abuts against the surface of the insulating ring (130).

10. The battery cover according to claim 9, characterized in that, The insulating ring (130) has a mounting through hole, which forms the mounting part (131), and part of the second part (112) is installed in the mounting through hole; The first part (111) is located on the side of the insulating ring (130) close to the battery housing, or on the side away from the battery housing.

11. The battery cover according to claim 6, 9 or 10, characterized in that, It also includes a connecting ring (150) for connecting to the insulating ring (130) and the battery housing.

12. A battery, characterized in that, It includes a battery housing and a battery cover plate according to any one of claims 1-11; the battery cover plate is mounted on the battery housing.

13. The battery according to claim 12, characterized in that, It also includes battery cells, which are located in the battery casing and have tabs on them.

14. A battery pack, characterized in that, The battery pack includes the battery as described in claim 12 or 13.

15. An electrical appliance, characterized in that, The electrical equipment includes the battery pack as described in claim 14.

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