Battery cover plate assembly, battery, battery pack and electric device

Abstract

Provided in the present application are a battery cover plate assembly, a battery and an electric device. The battery cover plate assembly is configured to be mounted to a battery housing of a battery. The battery cover plate assembly comprises a connecting ring, an insulation ring, a cover plate and a limiting structure, wherein the connecting ring is configured to be connected to the battery housing; the insulation ring is connected to the battery housing by means of the connecting ring, and has an annular cavity; the cover plate is connected to the insulation ring, and at least part of the cover plate passes through the annular cavity and is then connected to a tab of the battery; and the limiting structure is located within the battery housing and forms an opening through which the tab passes. The connecting ring is used to reduce the difficulty of connection between the battery housing and the insulation ring; the insulation ring is used to achieve insulation and connection between the cover plate and the battery housing; the cover plate is used to form a positive electrode and a negative electrode of the battery; and the limiting structure is used to guide the mounting of the tab. Moreover, the battery cover plate assembly is easy to mount and has high processing efficiency and high safety, and can solve the problem of a cover plate having many parts and a complex structure and being thus difficult to process and low in processing efficiency.

Description

Battery cover assembly, battery, battery pack and electrical equipment

[0001] This disclosure claims priority to Chinese Patent Application No. 202411218911.1, filed with the Chinese Patent Office on August 30, 2024, entitled “Battery Cover Assembly, Battery, Battery Pack and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery cover assembly, a battery, a battery pack, and an electrical device. Background Technology

[0003] A battery is a power source that provides power to tools, and often refers to the storage or rechargeable battery that powers electric vehicles, electric trains, electric bicycles, and golf carts.

[0004] Current batteries are generally composed of structural components such as cover plates and aluminum shells; among which, the existing cover plates are mainly composed of components such as limiting parts, smooth cover plates, sealing rings, terminals, insulating parts, lead-out plates, explosion-proof valves, explosion-proof valve protection plates, and terminals.

[0005] In related technologies, cover plates have many components and complex structures, resulting in difficulties in processing and low processing efficiency. Summary of the Invention

[0006] This application provides a battery cover assembly, a battery, a battery pack, and an electrical device, which can solve the problems of numerous cover parts, complex structure, high difficulty in cover processing, and low processing efficiency.

[0007] The embodiments of this application provide the following technical solutions:

[0008] A first aspect of this application provides a battery cover assembly for mounting on a battery casing. The battery cover assembly includes:

[0009] Connecting ring, used to connect to the battery casing;

[0010] An insulating ring is connected to the battery casing via a connecting ring, and the insulating ring has a ring cavity;

[0011] A cover plate, connected to an insulating ring, at least a portion of which is connected to the battery's tabs via a ring cavity;

[0012] A limiting structure is located in the battery casing and forms an opening for the electrode tabs to pass through.

[0013] In this battery cover assembly, the connecting ring connects the battery casing and the insulating ring, reducing the difficulty of connecting the battery casing and the insulating ring; the insulating ring insulates the cover and the battery casing, reducing the occurrence of battery short circuits; the cover connects to the battery core via tabs to form the positive and negative terminals of the battery, ensuring normal battery use; and the limiting structure guides the installation of the tabs, reducing the occurrence of battery short circuits due to contact between the tabs and the core or battery casing. This design also offers advantages such as easy installation and high processing efficiency.

[0014] In one feasible implementation, a limiting member is further included, which is connected to the interior of the battery housing and is connected to at least one of the connecting ring and the insulating ring; the side of the limiting member opposite to the battery housing forms a limiting structure.

[0015] The battery cover assembly with this structure includes a limiting component to accommodate and protect the tabs, reducing damage to the tabs caused by external impacts, thereby improving the safety of the tabs and extending the battery's lifespan.

[0016] In one feasible implementation, the insulating ring has an extension, at least a portion of which is located in the battery housing, and the extension forms a limiting structure.

[0017] In this battery cover assembly, the insulating ring extends toward the side closer to the electrode core, and the extension extends toward the side closer to the electrode tab. The insulating ring is used to form an annular cavity to isolate the connection between the electrode tab and the battery casing, thereby reducing the occurrence of battery short circuits; the extension is used to form a limiting structure to accommodate and protect the electrode tab.

[0018] In one feasible implementation, the limiting structure is an insulating element.

[0019] The battery cover assembly with this structure has an insulating component that can isolate the electrical connection between the tabs and other conductive metals in the battery, thereby reducing the occurrence of battery short circuits, protecting the battery, and extending the battery's lifespan.

[0020] In one feasible implementation, the limiting structure includes a first limiting part and a second limiting part, which are disposed opposite to each other and enclose an opening.

[0021] In this battery cover assembly, the tabs are located inside the opening. A first limiting part is used to limit the offset of the tabs to the side away from the second limiting part, and a second limiting part is used to limit the offset of the tabs to the side away from the first limiting part, thereby reducing the contact between the tabs and other components in the battery, reducing the occurrence of battery short circuits, and thus providing safety protection for the battery.

[0022] In one feasible implementation, the limiting structure is annular, with an opening formed in the inner ring of the annulus.

[0023] In this battery cover assembly, the tabs are located inside the opening. The annular inner ring can limit the offset of the tabs inside the battery casing, thereby limiting the contact between the tabs and other components in the battery, reducing the occurrence of battery short circuits, and thus providing safety protection for the battery.

[0024] In one feasible implementation, the limiting structure has a guiding surface for facing the battery core, and at least a portion of the tabs extend along the guiding surface.

[0025] The battery cover assembly with this structure has a guide surface that directs the tabs toward the side closer to the cover, thereby reducing the bending of the tabs and minimizing short circuits caused by contact between the tabs and the battery core. This improves battery safety and extends battery life.

[0026] In one feasible implementation, the guide surface is inclined and extends from the limiting structure toward the side closer to the electrode tab.

[0027] In this battery cover assembly, the guide surface is used to limit the offset of the tabs to reduce the occurrence of tab bending, and the guide surface can also bring the tabs together to reduce the occurrence of short circuits caused by the tabs coming into contact with other components in the battery.

[0028] In one feasible implementation, the connecting ring is a metal component.

[0029] The metal ring in this battery cover assembly structure reduces the difficulty of connecting the connecting ring and the battery housing, thereby improving the processing efficiency between the battery cover assembly and the battery housing.

[0030] In one feasible implementation, the insulating ring has a guide portion, at least a portion of which is located in the battery housing, the guide portion being used to guide the connection between the battery tabs and the cover plate.

[0031] The battery cover assembly of this structure has a guide section that guides the connection between the battery tabs and the cover, thereby isolating the connection between the tabs and the battery casing and reducing the occurrence of battery short circuits.

[0032] In one feasible implementation, at least a portion of the insulating ring is constricted along the direction from the cover plate to the battery core.

[0033] In this battery cover assembly, at least a portion of the insulating ring is tapered, which extends the length of the insulating ring to isolate the connection between the tab and the casing, thereby providing insulation protection for the battery and extending its service life. It also reduces the space occupied by the insulating ring, thereby reducing the processing cost of the insulating ring, and reduces the overall weight of the battery cover assembly, thus making the battery lighter.

[0034] In one feasible embodiment, the insulating ring includes: a first ring body and a second ring body, the first ring body being connected to the second ring body; the inner rings of the first ring body and the inner rings of the second ring body enclose and form a ring cavity;

[0035] The second ring is located on the side of the first ring furthest from the battery core;

[0036] Along the direction from the vertical cover plate to the battery core, at least part of the second ring body protrudes from the first ring body.

[0037] In this battery cover assembly, the arrangement of the first and second rings increases the connection area with the connecting ring, thereby reducing the connection difficulty between the connecting ring and the insulating ring and improving the processing efficiency of the battery cover assembly; it can also isolate the direct contact between the cover and the connecting ring to provide insulation protection for the battery, thereby extending the battery's service life.

[0038] In one possible implementation, the cover plate includes a first part and a second part, wherein the second part is connected to the periphery of the first part;

[0039] The first part is connected to at least one of the first ring body and the second ring body;

[0040] The second part is threaded through the inner rings of the first ring and the second ring, and connected to the battery terminals.

[0041] In this battery cover assembly, the second part connected to the periphery of the first part can increase the area of ​​the cover, thereby increasing the area at the connection between the cover and the insulating ring, thus increasing the connection strength between the cover and the insulating ring, increasing the connection strength of the cover assembly, and reducing the occurrence of the cover falling off from the insulating ring, thereby extending the battery's service life.

[0042] In one possible implementation, the connecting ring has an inner surface and an outer surface, and the inner and outer surfaces are connected.

[0043] The inner surface is connected to the periphery of the first ring body;

[0044] And / or, the outer surface is connected to the second ring body.

[0045] The battery cover assembly with this structure can increase the connection area between the connecting ring and the insulating ring by setting the inner and outer surfaces, thereby improving the connection strength between the connecting ring and the insulating ring and reducing the connection difficulty between the connecting ring and the insulating ring, thus improving the installation efficiency of the battery cover assembly.

[0046] In one feasible implementation, the outer surface is connected to the battery casing.

[0047] In this battery cover assembly, the battery housing is located on the outer surface away from the insulating ring, and the outer surface is connected to the battery housing. This reduces the difficulty of connecting the connecting ring and the battery housing, thereby improving the processing efficiency between the battery cover assembly and the battery housing.

[0048] In one feasible embodiment, the insulating ring has a guide portion extending from the battery core direction to the cover plate direction, at least a portion of the guide portion protruding from the insulating ring, and the cover plate is connected to the guide portion.

[0049] The battery cover assembly with this structure has a guide section that supports the installation of the cover and guides the installation position of the cover, thereby improving the installation efficiency of the battery cover assembly.

[0050] In one feasible implementation, the cover plate has a first maximum length L1, and the connection between the battery tab and the battery core has a second maximum length L2, wherein the first maximum length L1 and the second maximum length L2 satisfy the following:

[0051] 1 > L2 / L1 ≥ 0.8.

[0052] This battery cover assembly structure, by ensuring that the first maximum length L1 and the second maximum length L2 satisfy: 1>L2 / L1≥0.8, can increase the connection area at the connection between the cover and the tab, thereby increasing the current-carrying area of ​​the cover and making the current-carrying surface of the cover larger, thus improving the performance of the battery; and it can also reduce the connection difficulty between the tab and the cover, and has the advantage of convenient processing.

[0053] In one feasible implementation, the battery core has a third maximum length L3, and the third maximum length L3 satisfies the following relationship with the second maximum length L2:

[0054] 1≥L2 / L3≥0.8.

[0055] This battery cover assembly structure, by ensuring that the third maximum length L3 and the second maximum length L2 satisfy: 1≥L2 / L3≥0.8, can increase the connection area at the connection between the tab and the core body, and increase the current-carrying surface between the tab and the core body, thereby improving the battery's performance. Increasing the connection area at the connection between the tab and the core body can also increase the connection area between the side of the tab away from the core body and the cover assembly, thereby improving the battery's performance.

[0056] In one feasible implementation, the cover plate located in the inner ring of the insulating ring has a projected area of ​​S1 on the surface where the outer top wall of the insulating ring is located.

[0057] The area of ​​the outer ring of the insulating ring projected onto the surface of the outer top wall of the insulating ring is S2;

[0058] The following condition holds true between S1 and S2: 1 / 10 ≤ S1 / S2 ≤ 1 / 2.

[0059] In this battery cover assembly, the cover plate located within the inner ring of the insulating ring has a projected area of ​​S1 on the surface of the outer top wall of the insulating ring; the outer ring of the insulating ring has a projected area of ​​S2 on the surface of the outer top wall of the insulating ring. S1 and S2 satisfy the condition: 1 / 10 ≤ S1 / S2 ≤ 1 / 2. This arrangement increases the area of ​​the cover plate, thereby increasing its current-carrying surface and improving its current-carrying capacity. This increased current-carrying surface also reduces battery temperature, extending battery life and improving battery safety.

[0060] In one feasible implementation, the cover plate located in the inner ring of the insulating ring has a projected area S1 on the surface where the outer top wall of the insulating ring is located, which satisfies the following:

[0061] S1 ≥ 50 square millimeters.

[0062] In this battery cover assembly, the cover plate located in the inner ring of the insulating ring is connected to the battery core through the tab. Increasing the area of ​​the cover plate in the inner ring of the insulating ring can increase the current-carrying area of ​​the cover plate, thereby increasing the current-carrying surface of the cover plate and improving the current-carrying capacity of the cover plate, thus improving the performance of the battery cover assembly.

[0063] In one feasible implementation, along the direction from the cover plate to the battery core, the cover plate has a minimum cross-sectional end face, and the current-carrying area S3 of the minimum cross-sectional end face of the cover plate satisfies the following condition.

[0064] S3≥I / N;

[0065] Where I is the required continuous current of the battery, in A; N is the current carrying capacity of the cover plate, in A / mm².2 .

[0066] This battery cover assembly structure, by ensuring that S3 ≥ I / N, increases the area of ​​the cover, thereby increasing the current-carrying area and thus the current-carrying capacity of the cover, thereby improving the performance of the battery cover assembly. Furthermore, the minimum cross-sectional end face size of the cover can be selected according to the continuous current required by the battery and the current-carrying coefficient of different cover materials, which can avoid wasting conductive materials used in the production of the cover body, thereby reducing the manufacturing cost of the cover and reducing the overall weight of the cover assembly, thus reducing the weight of the battery and making the battery more portable.

[0067] In one feasible implementation, the battery core has a connection surface that connects to the battery tab, and the outer wall of the battery tab and the connection surface are set at an angle θ.

[0068] The included angle θ satisfies: 95°≥θ≥80°.

[0069] This battery cover assembly, by setting the connection surface and the outer wall of the tab at an angle, can reduce the occurrence of tab bending, thereby improving battery safety; and can also prevent the tab from contacting the core, which could lead to a short circuit, thus extending the battery's lifespan.

[0070] In one feasible implementation, the battery core has a connection surface that connects to the battery tab, and the outer wall of the battery tab and the connection surface are set at an angle θ.

[0071] The included angle θ satisfies: 95°≥θ≥90°.

[0072] This battery cover assembly, by setting the connection surface and the outer wall of the tab at an angle, can reduce the occurrence of tab bending, thereby improving battery safety; and can also prevent the tab from contacting the core, which could lead to a short circuit, thus extending the battery's lifespan.

[0073] In one feasible implementation, a buffer groove is provided on the cover plate, and the buffer groove is located on at least one side of the cover plate that is close to or away from the battery housing.

[0074] The battery cover assembly with this structure has a buffer groove on the cover that can accommodate the deformation of the insulating ring caused by the pressure of the insulating ring on one side of the cover under high and low temperature impacts, and release the stress on the insulating ring to reduce the occurrence of cracking of the insulating ring, thereby improving the yield rate and lifespan of the battery.

[0075] A second aspect of this application provides a battery, including a battery casing and a battery cover assembly, the battery cover assembly being disposed on the battery casing.

[0076] A third aspect of this application provides a battery pack including a battery.

[0077] A fourth aspect of this application provides an electrical device, including an electrical appliance and a battery or battery pack, wherein the battery or battery pack is used to provide electrical energy to the electrical appliance.

[0078] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems solved by the battery cover assembly, battery, battery pack, and electrical equipment provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation methods. Attached Figure Description

[0079] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0080] Figure 1 is a schematic diagram of the main structure of the battery provided in an embodiment of this application;

[0081] Figure 2 is a cross-sectional view of section AA in Figure 1 provided in an embodiment of this application;

[0082] Figure 3 is an enlarged structural diagram of point B in Figure 2 provided in an embodiment of this application;

[0083] Figure 4 is a schematic diagram of one of the main structures of the insulating ring provided in an embodiment of this application;

[0084] Figure 5 is a schematic diagram of the main structure of the insulating ring provided in an embodiment of this application (the second one).

[0085] Figure 6 is a schematic diagram of the main structure of the cover plate provided in an embodiment of this application;

[0086] Figure 7 is a top view of one of the embodiments of this application showing the connection structure between the cover plate and the insulating ring.

[0087] Figure 8 is a cross-sectional view of section CC in Figure 7 provided in an embodiment of this application;

[0088] Figure 9 is a top view of the connection structure between the cover plate and the insulating ring provided in an embodiment of this application (the second one).

[0089] Figure 10 is a cross-sectional view of section DD in Figure 9 provided in an embodiment of this application;

[0090] Figure 11 is a schematic diagram of the main structure of the connecting ring provided in an embodiment of this application;

[0091] Figure 12 is a schematic diagram of the connection structure at the connection point of the electrode core, electrode tab and cover plate provided in an embodiment of this application;

[0092] Figure 13 is a schematic diagram showing the distribution of the orthographic projection area S1 of the cover plate located in the inner ring of the insulating ring provided in an embodiment of this application on the surface where the outer top wall of the insulating ring is located.

[0093] Figure 14 is a schematic diagram showing the distribution of the orthographic projection area S2 of the outer ring of the insulating ring provided in the embodiment of this application on the surface where the outer top wall of the insulating ring is located.

[0094] Figure 15 is a schematic diagram showing the distribution of the current-carrying area S3 of the minimum cross-sectional end face of the cover plate provided in the embodiment of this application.

[0095] Figure 16 is a schematic diagram of the installation structure of the buffer groove provided in an embodiment of this application;

[0096] Figure 17 is a schematic diagram of the main structure of the battery provided in an embodiment of this application (second example).

[0097] Figure 18 is an exploded structural diagram of one of the connecting ring, insulating ring and cover plate provided in an embodiment of this application;

[0098] Figure 19 is a schematic diagram of the main structure of the battery provided in the embodiment of this application (third one);

[0099] Figure 20 is a second exploded structural diagram of the connecting ring, insulating ring, and cover plate provided in an embodiment of this application;

[0100] Figure 21 is a schematic diagram of the main structure of the battery provided in the embodiment of this application (fourth one);

[0101] Figure 22 is a second exploded structural diagram of the connecting ring, insulating ring, and cover plate provided in an embodiment of this application.

[0102] Explanation of reference numerals in the attached drawings: 100-Connecting ring; 101-Inner surface; 102-Outer surface; 1021-First outer surface; 1022-Second outer surface; 200-Insulating ring; 201-Extension; 202-Ring cavity; 203-Guide part; 204-First ring body; 205-Second ring body; 206-Guiding part; 300-Cover plate; 301-First part; 302-Second part; 303-Buffer groove; 400-Limiting structure; 401-First limiting part; 402-Second limiting part; 403-Guiding surface; 500-Battery casing; 501-Electrode tab; 502-Electrode core; 600-Explosion-proof valve; 700-Injection hole; L1-First maximum length; L2-Second maximum length; L3-Third maximum length; θ-Included angle; S1 - The projected area of ​​the cover plate located in the inner ring of the insulating ring on the surface of the outer top wall of the insulating ring; S2 - The projected area of ​​the outer ring of the insulating ring on the surface of the outer top wall of the insulating ring; S3 - The current-carrying area of ​​the smallest cross-sectional end face of the cover plate. Detailed Implementation

[0103] A battery is a power source that provides power to tools, and often refers to the storage or rechargeable battery that powers electric vehicles, electric trains, electric bicycles, and golf carts.

[0104] Current batteries are generally composed of structural components such as cover plates and aluminum shells; among which, the existing cover plates are mainly composed of components such as limiting parts, smooth cover plates, sealing rings, terminals, insulating parts, lead-out plates, explosion-proof valves, explosion-proof valve protection plates, and terminals.

[0105] In related technologies, cover plates have many components and complex structures, resulting in difficulties in processing and low processing efficiency.

[0106] In related technologies, the electrode core is located inside the battery casing and is responsible for the electrochemical reaction and the storage and release of electrical energy. The electrode core includes multiple positive electrode plates, multiple negative electrode plates, and multiple separators. A separator is disposed between each positive electrode plate and each negative electrode plate to prevent direct contact between the positive and negative electrode plates, which could lead to a short circuit in the battery.

[0107] The battery cover assembly provided in the embodiments of this application includes a connecting ring for connecting the battery casing and an insulating ring to reduce the difficulty of connecting the battery casing and the insulating ring; an insulating ring for insulating the connecting cover and the battery casing to reduce the occurrence of battery short circuits; a cover for connecting to the battery core via tabs to form the positive and negative terminals of the battery to meet the normal use of the battery; and a limiting structure for guiding the installation of the tabs to reduce the occurrence of battery short circuits caused by contact between the tabs and the core or battery casing, thereby improving battery safety and extending battery life.

[0108] As shown in Figures 1, 2, and 3, the battery cover assembly provided in the embodiments of this application is used for mounting on the battery casing 500 of a battery. The battery cover assembly includes: a connector, an insulating ring 200, a cover plate 300, and a limiting structure 400. The connector 100 is used to connect to the battery casing 500; the insulating ring 200 is connected to the battery casing 500 via the connector 100, and the insulating ring 200 has an annular cavity 202; the cover plate 300 is connected to the insulating ring 200, and at least a portion of the cover plate 300 is connected to the battery tab 501 through the annular cavity 202; the limiting structure 400 is located in the battery casing 500 and forms an opening for the tab 501 to pass through.

[0109] As shown in Figure 4, it should be noted that the annular cavity 202 is disposed in the inner ring of the insulating ring 200. The annular cavity 202 is used to isolate the connection between the tab 501 and the battery casing 500 to reduce the occurrence of battery short circuits. Furthermore, the annular cavity 202 can accommodate and protect the tab 501 to reduce the occurrence of damage to the tab 501 caused by external collisions, thereby improving the safety of the tab 501 and extending the battery's service life.

[0110] It should be noted that there are several different ways to connect the cover plate 300 and the insulating ring 200. Examples of the connection methods between the cover plate 300 and the insulating ring 200 will be given below.

[0111] In one feasible implementation, the cover plate 300 and the insulating ring 200 are fixedly connected by brazing; using brazing can reduce the connection thickness between the cover plate 300 and the insulating ring 200, thereby reducing the external space occupied.

[0112] In another feasible implementation, the cover plate 300 and the insulating ring 200 are bonded together with adhesive. Using adhesive bonding has the advantage of convenient connection, thereby improving the installation efficiency of the cover plate 300 and the insulating ring 200.

[0113] In addition, in other feasible embodiments, the cover plate 300 and the insulating ring 200 are heat-fused together. The use of heat-fused connection has the advantages of strong connection stability and mass production capability, which can improve the processing efficiency between the cover plate 300 and the insulating ring 200.

[0114] It is understandable that there are no restrictions on the specific connection method between the cover plate 300 and the insulating ring 200. It can be selected according to the actual use requirements, as long as the cover plate 300 and the insulating ring 200 are fixedly connected.

[0115] It should be noted that there are several different ways to connect the connecting ring 100 and the insulating ring 200. Examples of the connection methods between the connecting ring 100 and the insulating ring 200 will be given below.

[0116] In one feasible implementation, the connecting ring 100 and the insulating ring 200 are fixedly connected by brazing; using brazing can reduce the connection thickness between the connecting ring 100 and the insulating ring 200, thereby reducing the external space occupied.

[0117] In another feasible implementation, the connecting ring 100 and the insulating ring 200 are bonded together with adhesive. Using adhesive bonding has the advantage of convenient connection, thereby improving the installation efficiency of the connecting ring 100 and the insulating ring 200.

[0118] In addition, in other feasible embodiments, the connecting ring 100 and the insulating ring 200 are heat-fused together. The heat-fused connection has the advantages of strong connection stability and mass production capability, which can improve the processing efficiency between the connecting ring 100 and the insulating ring 200.

[0119] It is understandable that there are no restrictions on the specific connection method between the connecting ring 100 and the insulating ring 200. It can be selected according to the actual use requirements, as long as the connecting ring 100 and the insulating ring 200 are fixedly connected.

[0120] It should be noted that the connector and the battery casing 500 are connected by low-temperature welding. Low-temperature welding can reduce the damage of high temperature to the electrode core 502 and electrode tab 501 inside the battery casing 500, so as to protect the electrode core 502 and electrode tab 501 inside the battery casing 500, thereby improving the connection efficiency between the battery casing 500 and the connector, and thus improving the yield of the battery pack.

[0121] It should be noted that the connecting ring 100 is a metal ring. The metal ring reduces the difficulty of connecting the connecting ring 100 and the battery housing 500, thereby improving the processing efficiency between the battery cover assembly and the battery housing 500.

[0122] It should be noted that the cover plate 300 is made of conductive material. The conductive material can be connected to the battery core 502 through the battery tab 501, so that the cover plate 300 can connect the internal and external circuits of the battery, thereby playing the role of transmitting current and leading out voltage.

[0123] It should be noted that the insulating ring 200 is made of insulating material or low conductivity material. The insulating ring 200 is used to isolate the cover plate 300 from direct contact with the battery casing 500. The insulating ring 200 can also insulate the battery casing 500 and the cover plate 300 to reduce the occurrence of battery short circuits and provide safety protection for the battery, thereby extending the battery's service life.

[0124] It should be noted that the limiting structure 400 is used to form an opening for the tab 501 to pass through. The opening can accommodate and protect the tab 501, thereby reducing the occurrence of damage to the tab 501 caused by external collisions, thus improving the safety of the tab 501 and increasing the service life of the battery.

[0125] The battery cover assembly provided in the embodiments of this application further includes a limiting member connected to the inside of the battery housing 500, and the side of the limiting member opposite to the battery housing 500 forms a limiting structure 400.

[0126] Understandably, the limiting component is used to accommodate and protect the tab 501, in order to reduce the occurrence of damage to the tab 501 caused by external collisions, thereby improving the safety of the tab 501 and increasing the battery's lifespan.

[0127] It should be noted that the limiting component has a variety of different installation positions, and the installation positions of the limiting component will be illustrated with examples below.

[0128] In one feasible implementation, the limiting member is connected to the connecting ring 100, which supports the limiting member so that the limiting member can form a limiting structure 400 to accommodate and protect the tab 501.

[0129] In another feasible implementation, the limiting member is connected to the insulating ring 200, which supports the limiting member so that the limiting member can form a limiting structure 400 to accommodate and protect the tab 501.

[0130] In addition, in other feasible embodiments, the limiting member is connected to the connecting ring 100 and the insulating ring 200 respectively. The connecting ring 100 and the insulating ring 200 can support the limiting member so that the limiting member can form a limiting structure 400 to accommodate and protect the tab 501.

[0131] Understandably, there are no restrictions on the specific installation location of the limiting component. It can be selected according to actual usage needs, as long as the limiting component can accommodate and protect the tab 501.

[0132] It should be noted that the insulating ring 200 provided in the embodiments of this application has an extension 201, at least a portion of which is located in the battery housing 500, and the extension 201 forms a limiting structure 400.

[0133] It should be noted that the insulating ring 200 extends toward the side closer to the electrode core 502, and the extension portion 201 extends toward the side closer to the electrode tab 501. The insulating ring 200 is used to form an annular cavity 202 to isolate the connection between the electrode tab 501 and the battery casing 500, thereby reducing the occurrence of battery short circuits. The extension portion 201 is used to form a limiting structure 400 to accommodate and protect the electrode tab 501.

[0134] The limiting structure 400 provided in the embodiments of this application is an insulating component. The insulating component can isolate the electrical connection between the tab 501 and other conductive metals in the battery, thereby reducing the occurrence of battery short circuits, providing safety protection for the battery, and extending the battery's service life.

[0135] The limiting structure 400 provided in the embodiments of this application has a variety of different setting methods. The setting methods of the limiting structure 400 will be illustrated below.

[0136] In one feasible embodiment, the limiting structure 400 includes a first limiting part 401 and a second limiting part 402, which are disposed opposite to each other and form an opening. The tab 501 is disposed inside the opening. The first limiting part 401 is used to limit the offset of the tab 501 toward the side away from the second limiting part 402, and the second limiting part 402 is used to limit the offset of the tab 501 toward the side away from the first limiting part 401, thereby reducing the contact between the tab 501 and other components in the battery, so as to reduce the occurrence of battery short circuit and thus provide safety protection for the battery.

[0137] In another feasible implementation, the limiting structure 400 is annular, with the inner ring of the annulus forming an opening. The tab 501 is disposed inside the opening. The inner ring of the annulus can limit the offset of the tab 501 inside the battery casing 500, thereby limiting the contact between the tab 501 and other components in the battery, reducing the occurrence of battery short circuits, and thus providing safety protection for the battery.

[0138] In addition, in other feasible embodiments, the limiting structure 400 has two parts. One limiting structure 400 includes a first limiting part 401 and a second limiting part 402, which are disposed opposite to each other and form an opening. The other limiting structure 400 is annular, and the inner ring of the annulus forms another opening. The tabs 501 are respectively housed inside the two openings. The two openings can respectively limit the contact between the tabs 501 and other components in the battery to reduce the occurrence of battery short circuits and thus provide safety protection for the battery.

[0139] It is understandable that the specific setting of the limiting structure 400 is not limited and can be selected according to actual usage requirements, as long as the limiting structure 400 can limit the contact between the tab 501 and other components in the battery.

[0140] The limiting structure 400 provided in the embodiments of this application has a guiding surface 403 for facing the battery core 502, and at least a portion of the tab 501 extends along the guiding surface 403.

[0141] Understandably, the guide surface 403 can guide the tab 501 to extend towards the side closer to the cover plate 300, thereby reducing the bending of the tab 501 and reducing the occurrence of battery short circuits caused by contact between the tab 501 and the electrode core 502, thus improving battery safety and extending battery life.

[0142] The guide surface 403 provided in the embodiments of this application is inclined and extends from the limiting structure 400 toward the side close to the tab 501.

[0143] It should be noted that the guide surface 403 and the battery casing 500 are spaced apart to reduce the deformation caused by the collision of the battery casing 500. This reduces the pressure on the limiting structure 400, which could cause the guide surface 403 to press against the tab 501, resulting in the tab 501 contacting the electrode core 502 and causing a short circuit in the battery.

[0144] It should be noted that, in the direction from the electrode core 502 to the cover plate 300, the limiting structure 400 is at least partially flared. The side surface of the limiting structure 400 facing the electrode core 502 is a guide surface 403. That is, in the direction from the electrode core 502 to the cover plate 300, a first gap is formed between the guide surface 403 located relatively close to the battery housing 500 and the electrode core 502, and a second gap is formed between the guide surface located relatively far from the battery housing 500 and the electrode core 502. The first gap is set to be less than or equal to the second gap.

[0145] Understandably, the guide surface 403 is used to limit the offset of the tab 501 in order to reduce the occurrence of bending of the tab 501, and the guide surface 403 can gather the tab 501 to reduce the occurrence of short circuit in the battery caused by contact between the tab 501 and other components in the battery.

[0146] As shown in FIG5, the insulating ring 200 provided in the embodiment of this application has a guide portion 203, at least a portion of the guide portion 203 is located in the battery housing 500, and the guide portion 203 is used to guide the connection between the battery tab 501 and the cover plate 300.

[0147] Understandably, the guide portion 203 is designed to guide the connection between the battery tab 501 and the cover plate 300, thereby isolating the connection between the tab 501 and the battery casing 500 and reducing the occurrence of battery short circuits.

[0148] It should be noted that, along the direction from the cover plate 300 to the battery core 502, at least a portion of the insulating ring 200 is tapered. That is, the insulating ring 200 located on the side relatively closer to the battery core 502 is smaller.

[0149] Understandably, at least a portion of the insulating ring 200 is designed with a constricted opening, which can extend the length of the insulating ring 200 to isolate the connection between the tab 501 and the housing, thereby providing insulation protection for the battery and extending its service life; it can also reduce the space occupied by the insulating ring 200, thereby reducing the processing cost of the insulating ring 200, and can reduce the overall weight of the battery cover assembly, thereby achieving battery portability.

[0150] The insulating ring 200 provided in the embodiments of this application includes: a first ring body 204 and a second ring body 205, the first ring body 204 being connected to the second ring body 205; the inner ring of the first ring body 204 and the inner ring of the second ring body 205 forming an annular cavity 202; the second ring body 205 is located on the side of the first ring body 204 away from the battery electrode core 502, and at least a portion of the second ring body 205 protrudes from the first ring body 204 along the direction from the cover plate 300 to the battery electrode core 502.

[0151] Understandably, the arrangement of the first ring 204 and the second ring 205 can increase the connection area with the connecting ring 100, thereby reducing the connection difficulty between the connecting ring 100 and the insulating ring 200, thus improving the processing efficiency of the battery cover assembly; and can isolate the direct contact between the cover 300 and the connecting ring 100 to provide insulation protection for the battery, thereby extending the battery's service life.

[0152] It should be noted that the first ring body 204 has a variety of different functions, and the functions of the first ring body 204 will be illustrated below.

[0153] In one possible implementation, at least a portion of the first ring 204 on the side near the battery core 502 forms an extension 201.

[0154] It is understood that at least a portion of the first ring body 204 forms an extension 201, which has the advantage of simple processing, and the extension 201 can avoid direct contact between the tab 501 and the battery casing 500, thereby extending the battery's service life.

[0155] In one possible implementation, at least a portion of the first ring 204 on the side near the battery core 502 forms a guide portion 203.

[0156] It is understandable that at least a portion of the first ring 204 forms a guide portion 203, which has the advantage of simple processing. The guide portion 203 can prevent direct contact between the tab 501 and the battery casing 500, thereby extending the battery's lifespan. It can also guide the installation of the tab 501, thus reducing the difficulty of connecting the tab 501 and the cover plate 300. Taking a cylindrical battery as an example: the guide portion 203 reduces the space occupied by the first ring 204 and has the advantage of convenient processing; thus, it can reduce the weight of the insulating ring 200, thereby reducing the overall weight of the cover plate assembly and the battery, achieving a lighter battery design, and improving battery processing efficiency.

[0157] Understandably, the specific functions of the first ring 204 are not limited and can be selected according to actual usage needs.

[0158] As shown in Figure 6, the cover plate 300 provided in the embodiment of this application includes a first part 301 and a second part 302, with the second part 302 connected to the periphery of the first part 301.

[0159] It should be noted that the second part 302 connected to the periphery of the first part 301 can increase the area of ​​the cover plate 300, thereby increasing the area of ​​the connection between the cover plate 300 and the insulating ring 200, thus increasing the connection strength between the cover plate 300 and the insulating ring 200, increasing the connection strength of the cover plate assembly, and reducing the occurrence of the cover plate 300 falling off from the insulating ring 200, thereby extending the battery's service life.

[0160] It should be noted that the inner wall of the second part 302 is connected to the outer peripheral wall of the first part 301. There are a variety of different connection methods between the inner wall of the second part 302 and the outer peripheral wall of the first part 301. The connection methods between the inner wall of the second part 302 and the outer peripheral wall of the first part 301 will be illustrated with examples below.

[0161] In one feasible implementation, the inner wall of the second part 302 is welded to the outer peripheral wall of the first part 301. It is understood that welding and fixing the second part 302 and the first part 301 has the advantage of low processing difficulty, thereby improving the processing efficiency of the battery cover 300.

[0162] In another feasible embodiment, the second part 302 and the first part 301 are processed by an integrated molding process. Along the depth direction of the cover plate 300, the first part 301 is located inside the second part 302. The integrated molding process between the second part 302 and the first part 301 has the advantage of high connection strength.

[0163] It is understandable that the specific connection method between the inner wall of the second part 302 and the outer peripheral wall of the first part 301 is not limited and can be selected according to actual usage requirements, as long as the inner wall of the second part 302 and the outer peripheral wall of the first part 301 are fixedly connected.

[0164] It should be noted that the first part 301 passes through the inner ring of the first ring body 204 and the inner ring of the second ring body 205 respectively, and is connected to the battery tab 501; so that the electrode core 502, the tab 501 and the cover plate 300 can be electrically connected.

[0165] The embodiments of this application provide a variety of different installation methods between the cover plate 300 and the insulating ring 200. The installation methods between the cover plate 300 and the insulating ring 200 will be illustrated below.

[0166] As shown in Figures 7 and 8, in one feasible embodiment, the first part 301 is located in the inner ring of the insulating ring 200, and the second part 302 protrudes from the insulating ring 200. The connection between the second part 302 and the insulating ring 200 is located on the side of the insulating ring 200 away from the battery housing 500. That is, the second part 302 is connected to the second ring body 205. The insulating ring 200 is used to limit the movement of the second part 302 toward the side closer to the battery housing 500, so as to limit the offset between the insulating ring 200 and the cover plate 300, thereby improving the connection stability between the cover plate 300 and the insulating ring 200, and thus improving the service life of the battery cover plate assembly.

[0167] It should be noted that the part of the second part 302 protruding insulating ring 200 is used to facilitate the installation of the battery cover assembly with other external components. The part of the second part 302 protruding insulating ring 200 can indicate to the operator that this part is the preset installation position, thereby guiding the operator to the installation position, reducing the installation difficulty of the battery cover assembly with other external components, and thus improving the installation efficiency of the battery pack.

[0168] As shown in Figures 9 and 10, in another feasible embodiment, the first part 301 is located in the inner ring of the insulating ring 200 and protrudes from the insulating ring 200. The connection between the second part 302 and the insulating ring 200 is located between the insulating ring 200 and the battery housing 500. That is, the second part 302 is connected to the first ring body 204. The insulating ring 200 is used to limit the movement of the second part 302 toward the side away from the battery housing 500, so as to limit the offset between the insulating ring 200 and the cover plate 300, thereby improving the connection stability between the cover plate 300 and the insulating ring 200, and thus improving the service life of the battery cover plate assembly.

[0169] It should be noted that the part of the first part 301 with the protruding insulating ring 200 is used to facilitate the installation of the battery cover assembly with other external components. The part of the first part 301 with the protruding insulating ring 200 can indicate to the operator that this part is the preset installation position, thereby guiding the operator to the position during installation, reducing the installation difficulty of the battery cover assembly with other external components, and thus improving the installation efficiency of the battery pack.

[0170] In addition, in another feasible embodiment, the first part 301 is located in the inner ring of the insulating ring 200, and two second parts 302 are respectively provided at the two ends of the first part 301. One of the second parts 302 is connected to the second ring body 205, and the other second part 302 is connected to the first ring body 204.

[0171] It should be noted that the two second parts 302 can increase the connection strength between the cover plate 300 and the insulating ring 200, and can also serve to indicate to the operator that this part is the preset installation position, thereby guiding the operator to the position during installation, reducing the installation difficulty of the battery cover assembly and other external components, and thus improving the installation efficiency of the battery pack.

[0172] It is understandable that there are no restrictions on the specific installation method between the cover plate 300 and the insulating ring 200, and it can be selected according to the actual use requirements.

[0173] It should be noted that when the insulating ring 200 includes a first ring body 204 and a second ring body 205, and the cover plate 300 includes a first part 301 and a second part 302, there are a variety of different connection methods between the insulating ring 200 and the cover plate 300. The connection methods between the insulating ring 200 and the cover plate 300 will be illustrated with examples below.

[0174] In one possible implementation, the first ring body 204 is connected to the second part 302.

[0175] It should be noted that the connection between the first ring 204 and the second part 302 can reduce the positioning difficulty between the insulating ring 200 and the cover plate 300, thereby improving the processing efficiency of the cover plate assembly.

[0176] In another feasible implementation, the second ring 205 is connected to the second part 302.

[0177] It should be noted that the connection between the second ring 205 and the second part 302 has the advantage of being easy to process.

[0178] In addition, in another feasible embodiment, the first part 301 is connected to the first ring body 204 and the second ring body 205 respectively.

[0179] It should be noted that the first part 301 is connected to the first ring body 204 and the second ring body 205 respectively, which can improve the connection strength between the insulating ring 200 and the cover plate 300.

[0180] It is understandable that when the insulating ring 200 includes a first ring body 204 and a second ring body 205, and the cover plate 300 includes a first part 301 and a second part 302, the specific connection method between the insulating ring 200 and the cover plate 300 is not limited and can be selected according to actual usage requirements, as long as the connection between the insulating ring 200 and the cover plate 300 is guaranteed.

[0181] It should be noted that the connection between the insulating ring 200 and the cover plate 300 can be one or a combination of the above three embodiments, and this embodiment does not limit it.

[0182] As shown in Figure 11, the connecting ring 100 provided in the embodiment of this application has an inner surface 101 and an outer surface 102, and the inner surface 101 and the outer surface 102 are connected.

[0183] Understandably, the arrangement of the inner surface 101 and the outer surface 102 can increase the connection area between the connecting ring 100 and the insulating ring 200, thereby improving the connection strength between the connecting ring 100 and the insulating ring 200 and reducing the connection difficulty between the connecting ring 100 and the insulating ring 200, thus improving the installation efficiency of the battery cover assembly.

[0184] It should be noted that there are several different connection positions between the connecting ring 100 and the insulating ring 200. Examples of the connection positions between the connecting ring 100 and the insulating ring 200 will be given below.

[0185] In one feasible implementation, the inner surface 101 is connected to the periphery of the first ring body 204, and the inner surface 101 is sleeved on the periphery of the first ring body 204, which has the advantage of easy installation.

[0186] In another feasible implementation, the outer surface 102 is connected to the second ring body 205, and the inner surface 101 is spaced apart from the periphery of the first ring body 204, which has the advantage of low processing difficulty.

[0187] In addition, in another feasible embodiment, the outer surface 102 is connected to the second ring body 205, and the inner surface 101 is connected to the periphery of the first ring body 204, which has the advantage of high connection strength.

[0188] It is understandable that there are no restrictions on the specific connection method between the connecting ring 100 and the insulating ring 200, and it can be selected according to the actual use requirements.

[0189] It should be noted that the outer surface 102 is connected to the battery casing 500.

[0190] It is understandable that the battery housing 500 is located on the side of the outer surface 102 away from the insulating ring 200. The connection between the outer surface 102 and the battery housing 500 can reduce the connection difficulty between the connecting ring 100 and the battery housing 500, thereby improving the processing efficiency between the battery cover assembly and the battery housing 500.

[0191] It should be noted that the outer surface 102 includes: a first outer surface 1021 and a second outer surface 1022. The first outer surface 1021 and the second outer surface 1022 are connected. Along the direction from the battery core 502 to the cover plate 300, the first outer surface 1021 is the upper surface of the connecting ring 100. The first outer surface 1021 is connected to the cover plate 300, and the second outer surface 1022 is connected to the battery casing 500.

[0192] It is understandable that the first outer surface 1021 and the second outer surface 1022 are connected. The first outer surface 1021 is connected to the cover plate 300, and the second outer surface 1022 is connected to the battery casing 500. This can reduce the space occupied between the cover plate 300 and the battery casing 500, thereby reducing the size of the battery. It can also reduce the difficulty of connecting the cover plate 300 and the battery casing 500, thereby improving the processing efficiency of the battery.

[0193] It should be noted that the insulating ring 200 has a guide portion 206, which protrudes from the insulating ring 200 along the direction from the battery core 502 to the cover plate 300. The cover plate 300 is connected to the guide portion 206.

[0194] Understandably, the guide section 206 can support the installation of the cover plate 300 and guide the installation position of the cover plate 300, thereby improving the installation efficiency of the battery cover plate assembly.

[0195] It should be noted that at least a portion of the second ring body 205 forms a guide portion 206. Along the direction from the pole core 502 to the cover plate 300, the guide portion 206 protrudes from the second ring body 205. The guide portion 206 can support the cover plate 300 and guide the installation of the connection between the cover plate 300 and the insulating ring 200.

[0196] As shown in Figure 12, the cover plate 300 provided in the embodiment of this application has a first maximum length L1, and the connection between the battery tab 501 and the battery core 502 has a second maximum length L2. The first maximum length L1 and the second maximum length L2 satisfy the following condition: 1 > L2 / L1 ≥ 0.8.

[0197] It is understandable that the first maximum length L1 and the second maximum length L2 satisfy the condition: 1 > L2 / L1 ≥ 0.8. This configuration increases the connection area between the cover assembly and the tab 501, thereby increasing the current-carrying area of ​​the cover assembly and improving its performance. Furthermore, it reduces battery heat generation, thus extending battery life and enhancing its safety.

[0198] It should be noted that the first length L1 can be set in several different ways. The following are examples of how to set the first length L1.

[0199] In one feasible implementation, the first length L1 is the surface of the cover plate 300 that is coplanar or parallel to the plane where the connection between the cover plate 300 and the tab 501 is located. It is understood that when the cover plate 300 is square, the first length L1 is the extension length of the surface of the cover plate 300 that is coplanar with the plane where the connection between the cover plate 300 and the tab 501 is located; when the cover plate 300 is circular, the first length L1 is the extension length of the surface of the cover plate 300 that is coplanar with the plane where the connection between the cover plate 300 and the tab 501 is located.

[0200] In another feasible implementation, the first length L1 is the longest length within the outermost ring of the cover plate 300, projected onto the surface containing the outer top wall of the cover plate 300. It can be understood that when the cover plate 300 is square, the first length L1 is the length of the straight line containing the diagonal of the square; when the cover plate 300 is circular, the first length L1 is the length of the straight line containing the diameter of the circle.

[0201] Understandably, there are no restrictions on how the first length L1 is set; it can be selected according to actual usage requirements.

[0202] It should be noted that there are several different arrangements between the electrode core 502 and the electrode tab 501. Examples of the arrangements between the electrode core 502 and the electrode tab 501 will be given below.

[0203] In one feasible implementation, the electrode core 502 has an electrode tab 501, which is connected to the electrode core 502 along a preset installation direction; wherein, the second maximum length L2 is the connection length between the electrode tab 501 and the electrode core 502 along the preset installation direction.

[0204] In another feasible implementation, the electrode core 502 has a plurality of electrode tabs 501, which are spaced apart on the electrode core 502 along a preset installation direction; wherein, the second maximum length L2 is the distance between the first electrode tab 501 and the last electrode tab 501 in the preset installation direction.

[0205] Understandably, there are no restrictions on the arrangement of the electrode core 502 and the electrode tab 501, and the arrangement can be selected according to actual usage requirements; and when there are no restrictions on the arrangement of the electrode core 502 and the electrode tab 501, there are no restrictions on the setting of the second maximum length L2, and the arrangement can be selected according to actual usage requirements.

[0206] It should be noted that there are several different ratios between the first maximum length L1 and the second maximum length L2. Examples of the ratios between the first maximum length L1 and the second maximum length L2 will be given below.

[0207] In one feasible implementation, the ratio of the first maximum length L1 to the second maximum length L2, L2 / L1, is 0.9, that is, the length of the end of the tab 501 connected to the core 502 is less than the length of the cover plate 300. This arrangement can avoid the insulating ring 200 on the cover plate 300, thereby reducing the connection difficulty between the cover plate 300 and the tab 501, and also reducing the processing cost of the tab 501.

[0208] In another feasible implementation, the ratio of the first maximum length L1 to the second maximum length L2, L2 / L1, is 0.8, that is, the length of the end of the tab 501 connected to the core 502 is less than the length of the cover plate 300. This setting can avoid the insulating ring 200 on the cover plate 300, thereby reducing the connection difficulty between the cover plate 300 and the tab 501, and also reducing the processing cost of the tab 501.

[0209] It is understandable that there are no restrictions on the specific setting of the ratio L2 / L1 of the first maximum length L1 and the second maximum length L2. It can be selected according to the actual needs of use, as long as 1>L2 / L1≥0.8 is guaranteed.

[0210] It should be noted that if L2 / L1 equals 1, the insulating ring 200 on the cover plate 300 will connect with the tab 501. Since the insulating ring 200 is made of insulating or weakly conductive material, the connection between the insulating ring 200 and the tab 501 will be difficult to process, and the tab 501 will be wasted. If L2 / L1 is less than 0.8, the connection area between the tab 501 and the cover plate 300 will be smaller, which will reduce the current-carrying surface of the cover plate 300 and reduce the current flow area of ​​the cover plate 300. This will result in a larger temperature rise of the cover plate 300, and a shorter battery life and worse safety. By ensuring that the first maximum length L1 and the second maximum length L2 satisfy the condition 1 > L2 / L1 ≥ 0.8, the connection area at the connection between the cover plate 300 and the tab 501 can be increased, thereby increasing the current-carrying area of ​​the cover plate 300 and making the current-carrying surface of the cover plate 300 larger, thus improving the performance of the battery; and the connection difficulty between the tab 501 and the cover plate 300 can be reduced, which has the advantage of convenient processing.

[0211] The battery core 502 provided in the embodiments of this application has a third maximum length L3, and the third maximum length L3 satisfies the following relationship with the second maximum length L2: 1≥L2 / L3≥0.8.

[0212] It is understandable that by ensuring that the third maximum length L3 and the second maximum length L2 satisfy: 1≥L2 / L3≥0.8, the connection area at the connection between the tab 501 and the core 502 body can be increased, and the current-carrying surface between the tab 501 and the core 502 body can be enlarged, thereby improving the battery's performance. Increasing the connection area at the connection between the tab 501 and the core 502 body can also increase the connection area between the side of the tab 501 away from the core 502 body and the cover assembly, thereby improving the battery's performance.

[0213] It should be noted that when obtaining the length values ​​of the third maximum length L3 and the second maximum length L2, the third maximum length L3 and the second maximum length L2 should be in the same direction to reduce the error between the third maximum length L3 and the second maximum length L2, thereby improving the measurement accuracy of the third maximum length L3 and the second maximum length L2.

[0214] It should be noted that the third maximum length L3 and the second maximum length L2 provided in the embodiments of this application have a variety of different ratios. Examples of the ratios of the third maximum length L3 and the second maximum length L2 will be given below.

[0215] In one feasible implementation, the ratio of the third maximum length L3 to the second maximum length L2, L2 / L3, is 1, that is, the end of the tab 501 connected to the core 502 is laid on the core 502. At this time, the connection surface area between the tab 501 and the core 502 is large, and the current-carrying surface area between the tab 501 and the core 502 is large, thereby improving the performance of the battery.

[0216] In another feasible implementation, the ratio of the third maximum length L3 to the second maximum length L2, L2 / L3, is 0.8, that is, the end of the tab 501 connected to the core 502 is laid on the core 502. At this time, the connection surface area between the tab 501 and the core 502 is large, and the current-carrying surface area between the tab 501 and the core 502 is large, thereby improving the performance of the battery.

[0217] It is understandable that the ratio of the third maximum length L3 to the second maximum length L2 is not restricted and can be selected according to actual usage requirements, as long as the third maximum length L3 and the second maximum length L2 satisfy: 1≥L2 / L3≥0.8.

[0218] It should be noted that if L2 / L3 is less than 0.8, the connection area at the junction of tab 501 and core 502 will decrease, resulting in a smaller current-carrying surface of tab 501 and a smaller current-carrying area between tab 501 and core 502. This leads to a larger temperature rise at tab 501 and core 502, resulting in a shorter battery life and reduced safety. By ensuring that the third maximum length L3 and the second maximum length L2 satisfy 1 ≥ L2 / L3 ≥ 0.8, the connection area at the junction of tab 501 and core 502 can be increased, thus increasing the current-carrying surface between them and improving battery performance. Increasing the connection area at the junction of tab 501 and core 502 also increases the connection area between the side of tab 501 away from core 502 and the cover plate 300, thereby improving battery performance.

[0219] The embodiments of this application provide that the first maximum length L1 and the second maximum length L2 satisfy the following condition: 0mm < L1 - L2 ≤ 6mm.

[0220] It should be noted that there are multiple differences between the first maximum length L1 and the second maximum length L2. Examples of the differences between the first maximum length L1 and the second maximum length L2 will be given below.

[0221] In one feasible implementation, the difference between the first maximum length L1 and the second maximum length L2, L1-L2, is 6 mm. That is, the length of the end where the tab 501 is connected to the core 502 is 6 mm shorter than the length of the cover plate 300. This arrangement can avoid the insulating ring 200 on the cover plate 300, thereby reducing the connection difficulty between the cover plate 300 and the tab 501, and also reducing the processing cost of the tab 501.

[0222] In another feasible implementation, the difference between the first maximum length L1 and the second maximum length L2, L1-L2, is 1 mm. That is, the length of the end of the tab 501 connected to the core 502 is 1 mm shorter than the length of the cover plate 300. This arrangement can avoid the insulating ring 200 on the cover plate 300, thereby reducing the connection difficulty between the cover plate 300 and the tab 501, and also reducing the processing cost of the tab 501.

[0223] It is understandable that the specific value of the difference between the first maximum length L1 and the second maximum length L2 is not limited and can be selected according to actual usage requirements, as long as the first maximum length L1 and the second maximum length L2 satisfy: 0mm < L1 - L2 ≤ 6mm.

[0224] It should be noted that if the difference between L1 and L2 is 0, the insulating ring 200 on the cover plate 300 will connect with the tab 501. Since the insulating ring 200 is made of insulating or weakly conductive material, the connection between the insulating ring 200 and the tab 501 will be difficult to process, resulting in waste of the tab 501. If the difference between L1 and L2 is greater than 6 mm, the connection area between the tab 501 and the cover plate 300 will be smaller, thus reducing the current-carrying surface of the cover plate 300 and decreasing the current flow area of ​​the cover plate 300. This will result in a larger temperature rise of the cover plate 300, and a shorter battery life and reduced safety.

[0225] It is understandable that the first maximum length L1 and the second maximum length L2 satisfy the following condition: 0mm < L1 - L2 ≤ 6mm. This battery structure, by increasing the connection area at the junction of the cover plate 300 and the tab 501, can increase the current-carrying area of ​​the cover plate 300 and thus improve the battery's performance. Furthermore, it can reduce the connection difficulty between the tab 501 and the cover plate 300, offering the advantage of convenient processing.

[0226] The second maximum length L2 and the third maximum length L3 provided in the embodiments of this application satisfy the following condition: 0mm≤L3-L2≤4mm.

[0227] It should be noted that there are multiple differences between the second maximum length L2 and the third maximum length L3. Examples of the differences between the second maximum length L2 and the third maximum length L3 will be given below.

[0228] In one feasible implementation, the difference L3-L2 between the second maximum length L2 and the third maximum length L3 is 4 mm, that is, the length of the electrode core 502 is 4 mm longer than the length of the connection between the electrode core 502 and the tab 501. At this time, the connection surface area between the tab 501 and the electrode core 502 is large, and the current carrying surface area between the tab 501 and the electrode core 502 is large, thereby improving the performance of the battery.

[0229] In another feasible implementation, the difference L3-L2 between the second maximum length L2 and the third maximum length L3 is 0 mm, that is, the length of the electrode core 502 is the same as the length of the connection between the electrode core 502 and the tab 501. At this time, the connection surface area between the tab 501 and the electrode core 502 is large, and the current-carrying surface area between the tab 501 and the electrode core 502 is large, thereby improving the performance of the battery.

[0230] It is understandable that the specific value of the difference L3-L2 between the second maximum length L2 and the third maximum length L3 is not limited and can be selected according to actual usage requirements, as long as the second maximum length L2 and the third maximum length L3 satisfy: 0mm≤L3-L2≤4mm.

[0231] It should be noted that if the difference between L3 and L2 is greater than 4 mm, the connection area at the junction of tab 501 and core 502 will be smaller, which will reduce the current-carrying surface of tab 501 and the current-passing area between tab 501 and core 502. This will result in a larger temperature rise of tab 501 and core 502, and will reduce the battery's lifespan and safety.

[0232] It is understandable that the second maximum length L2 and the third maximum length L3 satisfy the following condition: 0mm ≤ L3 - L2 ≤ 4mm. This battery structure, by reducing the exposed area of ​​the electrode core 502 and the tab 501, can increase the connection area at the junction of the tab 501 and the electrode core 502, thereby increasing the current-carrying surface between them and improving battery performance. Furthermore, increasing the connection area at the junction of the tab 501 and the electrode core 502 also increases the connection area between the side of the tab 501 facing away from the electrode core 502 and the cover plate 300, thus further enhancing battery performance.

[0233] The battery core 502 provided in the embodiments of this application has a connection surface that connects to the battery tab 501. The outer wall of the tab 501 and the connection surface are set at an angle θ; the angle θ satisfies: 95° ≥ θ ≥ 80°

[0234] It should be noted that the included angle θ has several different degree settings, and examples of the degree settings of the included angle θ are given below.

[0235] In one feasible implementation, the included angle θ is 80 degrees, that is, the connecting surface and the outer wall of the tab 501 are set at an 80-degree angle. This setting can reduce the bending of the tab 501, thereby reducing the occurrence of battery short circuits caused by contact between the tab 501 and the electrode core 502, thus improving battery safety and extending battery life.

[0236] In another feasible implementation, the included angle θ is 95 degrees, that is, the connecting surface and the outer wall of the tab 501 are set at a 95-degree angle. This setting can reduce the bending of the tab 501, thereby reducing the occurrence of battery short circuits caused by contact between the tab 501 and the electrode core 502, thus improving battery safety and extending battery life.

[0237] It is understandable that there is no limit to the degree of the included angle θ, which can be selected according to the actual needs of use, as long as the included angle θ satisfies: 95°≥θ≥80°.

[0238] It is understandable that by setting the connection surface and the outer wall of the tab 501 at an angle, the bending of the tab 501 can be reduced, thereby improving battery safety; and it can also prevent the tab 501 from contacting the core 502, which could cause a short circuit in the battery, thus extending the battery's lifespan.

[0239] The electrode core 502 provided in the embodiments of this application has a connecting surface that connects to the electrode tab 501, and the outer wall of the electrode tab 501 and the connecting surface are set at an angle θ; the angle θ satisfies: 95°≥θ≥90°

[0240] It should be noted that the included angle θ has several different degree settings, and examples of the degree settings of the included angle θ are given below.

[0241] In one feasible implementation, the included angle θ is 90 degrees, that is, the connecting surface and the outer wall of the tab 501 are set at a 90-degree angle. This setting can reduce the bending of the tab 501, thereby reducing the occurrence of battery short circuits caused by contact between the tab 501 and the electrode core 502, thus improving battery safety and extending battery life.

[0242] In another feasible implementation, the included angle θ is 93 degrees, that is, the connecting surface and the outer wall of the tab 501 are set at a 93-degree angle. This setting can reduce the bending of the tab 501, thereby reducing the occurrence of short circuits in the battery caused by contact between the tab 501 and the electrode core 502, thus improving the safety of the battery and extending its service life.

[0243] In addition, in another feasible implementation, the included angle θ is 95 degrees, that is, the connecting surface and the outer wall of the tab 501 are set at a 95-degree angle. This setting can reduce the bending of the tab 501, thereby reducing the occurrence of battery short circuits caused by contact between the tab 501 and the electrode core 502, thus improving battery safety and extending battery life.

[0244] It is understandable that there is no limit to the degree of the included angle θ, which can be selected according to the actual needs of use, as long as the included angle θ satisfies: 95°≥θ≥90°.

[0245] It is understandable that by setting the connection surface and the outer wall of the tab 501 at an angle, the bending of the tab 501 can be reduced, thereby improving battery safety; and it can also prevent the tab 501 from contacting the core 502, which could cause a short circuit in the battery, thus extending the battery's lifespan.

[0246] As shown in Figures 13 and 14, it should be noted that in the battery cover assembly provided in the embodiments of this application, the cover plate 300 located in the inner ring of the insulating ring 200 has an orthographic projection area of ​​S1 on the surface where the outer top wall of the insulating ring 200 is located; the outer ring of the insulating ring 200 has an orthographic projection area of ​​S2 on the surface where the outer top wall of the insulating ring 200 is located; S1 and S2 satisfy the following condition: 1 / 10≤S1 / S2≤1 / 2.

[0247] It is understood that the projected area of ​​the cover plate 300 located in the inner ring of the insulating ring 200 on the surface of the outer top wall of the insulating ring 200 is S1; the projected area of ​​the outer ring of the insulating ring 200 on the surface of the outer top wall of the insulating ring 200 is S2, and S1 and S2 satisfy the condition: 1 / 10 ≤ S1 / S2 ≤ 1 / 2. This arrangement increases the area of ​​the cover plate 300, thereby increasing its current-carrying surface and improving its current-carrying capacity, thus enhancing the performance of the battery cover plate assembly. The increased current-carrying surface of the cover plate 300 can also reduce the battery temperature, thereby extending battery life and improving battery safety.

[0248] It should be noted that if S1 / S2 is less than 1 / 10, the connection strength between the insulating ring 200 and the cover plate 300 will be insufficient, leading to the cover plate 300 detaching from the insulating ring 200. If S1 / S2 is greater than 1 / 2, since the cover plate 300 is a metal part, increasing its volume will increase the weight of the metal part, resulting in an increase in the overall weight of the battery, which is not conducive to the battery's portability and will also lead to high processing costs for the cover plate 300. By ensuring that S1 and S2 satisfy: 1 / 10 ≤ S1 / S2 ≤ 1 / 2, the area of ​​the cover plate 300 can be increased, thereby increasing the current-carrying area of ​​the cover plate 300, thus increasing the current-carrying capacity of the cover plate 300 and improving the performance of the battery cover plate assembly. Furthermore, the overall weight of the cover plate 300 can be reduced, thereby reducing the weight of the battery and making it more portable.

[0249] It should be noted that the orthographic projection area S1 of the cover plate 300 located in the inner ring of the insulating ring 200 on the surface where the outer top wall of the insulating ring 200 is located satisfies: S1≥50 square millimeters.

[0250] It is understandable that the cover plate 300 located in the inner ring of the insulating ring 200 is connected to the battery core 502 through the tab 501. Increasing the area of ​​the cover plate 300 located in the inner ring of the insulating ring 200 can increase the current-carrying area of ​​the cover plate 300, thereby increasing the current-carrying surface of the cover plate 300 and improving the current-carrying capacity of the cover plate 300, thereby improving the performance of the battery cover plate assembly.

[0251] It should be noted that if S1 is less than 50 square millimeters, the connection strength between the insulating ring 200 and the cover plate 300 will be insufficient, which will cause the cover plate 300 to fall off from the insulating ring 200; and because the cover plate 300 is small, the battery temperature will rise more, thereby reducing the battery life and resulting in poor battery safety.

[0252] As shown in Figure 15, it should be noted that in the cover plate assembly provided in the embodiments of this application, along the direction perpendicular to the cover plate 300 to the battery core 502, the cover plate 300 has a minimum cross-sectional end face, and the current-carrying area S3 of the minimum cross-sectional end face of the cover plate 300 satisfies: S3≥I / N; where I is the continuous current that the battery needs to meet, in A; and N is the current-carrying coefficient of the cover plate 300, in A / mm. 2 .

[0253] It is understandable that by ensuring S3 satisfies S3≥I / N, the area of ​​the cover plate 300 can be increased, thereby increasing the current-carrying area of ​​the cover plate 300 and thus increasing the current-carrying capacity of the cover plate 300, thereby improving the performance of the battery cover plate assembly. Furthermore, the minimum cross-sectional end face size of the cover plate 300 can be selected according to the continuous current required by the battery and the current-carrying coefficient of different materials of the cover plate 300, which can avoid wasting conductive materials used to manufacture the cover plate 300 body, thereby reducing the manufacturing cost of the cover plate 300 and reducing the overall weight of the cover plate assembly, thus reducing the weight of the battery and making the battery lighter.

[0254] It should be noted that the continuous current that the battery needs to meet refers to the current value when the internal current of the battery is continuously flowing during operation.

[0255] It should be noted that the current carrying capacity of the cover plate 300 refers to the maximum current that the cover plate 300 can carry per unit area. In the design of the battery, the maximum current is determined by the corresponding battery. Different batteries will be designed with a matching maximum current. In other words, the maximum current of the battery is not a fixed value, but is determined by a combination of factors such as the battery type, specifications, usage conditions and safety factors. It is determined during the design and testing process of the battery.

[0256] 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.

[0257] It should be noted that the projected area S3 of the minimum cross-sectional end face of the cover plate 300 on the surface where the outer top wall of the insulating ring 200 is located has a variety of different values. The following are examples illustrating the values ​​of the projected area S3 of the minimum cross-sectional end face of the cover plate 300 on the surface where the outer top wall of the insulating ring 200 is located.

[0258] In one feasible implementation, the cover plate 300 is made of copper, and the current carrying capacity N1 of the copper cover plate 300 is between 5-8 A / mm. 2 For example, the current carrying capacity N1 of the copper cover plate 300 can be 5 A / mm. 2 6A / mm 2 7A / mm 2 8A / mm 2 Or between 5-8A / mm 2 Any value between.

[0259] In this embodiment, the current carrying capacity N1 is set to 5 as an example. For instance, a 50A battery that meets the 4C requirement has a maximum current value of I1 = 200A, and the current carrying area S1 of the copper cover plate 300 is ≥ 200 / 5 = 40mm². 2 .

[0260] In another feasible embodiment, the cover plate 300 is made of aluminum, and the current carrying capacity N2 of the aluminum cover plate 300 is between 3-5 A / mm. 2 For example, the current carrying capacity N2 of the aluminum cover plate 300 can be 3A / mm. 2 3.5A / mm 2 4A / mm 2 5A / mm 2 Or between 3-5A / mm 2 Any value between.

[0261] In this embodiment, the current carrying capacity N2 is set to 3 as an example. For instance, a 50A battery that meets the 4C requirement has a maximum current value of I2 = 200A, and the current carrying area S2 of the aluminum cover plate 300 is ≥ 200 / 3 = 67mm². 2 .

[0262] In addition, in another feasible implementation, the cover plate 300 can be a metal composite.

[0263] It should be noted that metal composite refers to the cover plate 300 being made of different metal composites. In this embodiment, the specific composite material of the cover plate 300 is not limited. For example, the material of the cover plate 300 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 300 and the battery tab 501, it falls within the protection scope of this application.

[0264] In one feasible implementation, the cover plate 300 is made of a copper-aluminum composite material, and the current carrying capacity N3 of the copper-aluminum composite cover plate 300 is between 4-7 A / mm. 2 For example, the current carrying capacity N3 of the copper-aluminum composite cover plate 300 can be 4 A / mm. 2 5A / mm 2 6A / mm 2 7A / mm 2 Or between 4-7A / mm 2 Any value between.

[0265] In this embodiment, the current carrying capacity N3 is set to 4 as an example. For instance, a 50A battery that meets the 4C requirement has a maximum current value of I3 = 200A, and the current carrying area S3 of the copper-aluminum composite cover plate 300 is ≥ 200 / 4 = 50mm². 2 .

[0266] Understandably, there is no restriction on the value of the current-carrying area S3 of the minimum cross-sectional end face of the cover plate 300, and it can be selected according to actual usage requirements.

[0267] As shown in Figure 16, the cover plate 300 provided in the embodiment of this application has a buffer groove 303, which is located on at least one side of the cover plate 300 that is close to the battery housing 500 or away from the battery housing 500.

[0268] Understandably, the buffer groove 303 on the cover plate 300 can accommodate the deformation of the insulating ring 200 caused by the pressure on the side of the cover plate 300 under high and low temperature impact, and release the stress on the insulating ring 200, so as to reduce the occurrence of cracking of the insulating ring 200, thereby improving the yield rate and life of the battery.

[0269] It should be noted that the buffer groove 303 has a variety of different opening positions, and the opening positions of the buffer groove 303 will be illustrated with examples below.

[0270] In one feasible implementation, a buffer groove 303 is formed on the side of the cover plate 300 near the battery housing 500. The buffer groove 303 is used to accommodate the deformation caused by the insulating ring 200 pressing the cover plate 300 towards the side near the battery housing 500, so as to reduce the occurrence of cracking of the insulating ring 200, thereby improving the yield rate and service life of the battery.

[0271] In another feasible embodiment, a buffer groove 303 is formed on the side of the cover plate 300 away from the battery housing 500. The buffer groove 303 is used to accommodate the deformation caused by the insulating ring 200 pressing the cover plate 300 towards the side away from the battery housing 500, so as to reduce the occurrence of cracking of the insulating ring 200, thereby improving the yield rate and service life of the battery.

[0272] In addition, in another feasible embodiment, two buffer grooves 303 are provided. One buffer groove 303 is formed on the side of the cover plate 300 near the battery housing 500, and is used to accommodate the deformation caused by the insulating ring 200 pressing the cover plate 300 towards the side near the battery housing 500. The other buffer groove 303 is formed on the side of the cover plate 300 away from the battery housing 500, and is used to accommodate the deformation caused by the insulating ring 200 pressing the cover plate 300 towards the side away from the battery housing 500. Thus, the provision of buffer grooves 303 can reduce the occurrence of cracking of the insulating ring 200, thereby improving the battery yield and extending the battery life.

[0273] It is understandable that the location of the buffer groove 303 is not restricted and can be selected according to actual usage requirements, as long as the buffer groove 303 can accommodate the deformation caused by the insulating ring 200 pressing the cover plate 300 on the side facing the cover plate 300.

[0274] An embodiment of this application provides a battery, including a battery housing 500 and a battery cover assembly provided in the above embodiment, the battery cover assembly being disposed on the battery housing 500.

[0275] It should be noted that the cover plate 300 has various shapes, and examples of the shapes of the cover plate 300 will be given below.

[0276] As shown in Figures 17 and 18, in one feasible embodiment, the cover plate 300 is a circular cover plate 300, the battery is a cylindrical battery, and the circular cover plate 300 is disposed on the cylindrical battery.

[0277] It should be noted that the connection between the circular cover plate 300 and the cylindrical battery has the advantage of low installation difficulty, and the low installation difficulty can improve the installation efficiency of the circular cover plate 300 and the cylindrical battery.

[0278] As shown in Figures 19 and 20, in another feasible embodiment, the cover plate 300 is a square cover plate 300, the battery is a square battery, and the square cover plate 300 is disposed on the square battery.

[0279] It should be noted that the connection between the square cover plate 300 and the square battery has the advantage of occupying little space. In the case of multiple batteries being connected, the connection of multiple adjacent square batteries has the advantage of a compact structure.

[0280] Understandably, the shape of the cover plate 300 is not limited and can be selected according to actual usage needs, as long as the cover plate 300 and the battery are compatible and the cover plate 300 can be installed on the battery casing 500.

[0281] It should be noted that multiple positive electrode plates in the electrode core 502 are electrically connected to a cover plate 300 through electrode tabs 501, and the cover plate 300 connected to the positive electrode plates forms a positive electrode cover plate 300; multiple negative electrode plates are electrically connected to another cover plate 300 through electrode tabs 501, and the cover plate 300 connected to the negative electrode plates forms a negative electrode cover plate 300.

[0282] In the battery provided in the embodiments of this application, the cover plate 300 has a variety of different functions, which will be described by example below.

[0283] In one feasible implementation, the cover plate 300 forms the positive electrode cover plate 300 of the battery, and the positive electrode cover plate 300 is disposed on the battery casing 500 by an insulating ring 200 and a connecting ring 100; the positive electrode cover plate 300 can increase the current carrying surface of the positive electrode of the battery to improve the current carrying capacity of the battery, thereby improving the performance of the battery.

[0284] In another feasible implementation, the cover plate 300 forms the negative electrode cover plate 300 of the battery, and the negative electrode cover plate 300 is disposed on the battery casing 500 through the insulating ring 200 and the connecting ring 100; the negative electrode cover plate 300 can increase the current carrying surface of the negative electrode of the battery to improve the current carrying capacity of the battery, thereby improving the performance of the battery.

[0285] As shown in Figures 21 and 22, in another feasible embodiment, two cover plates 300 are provided. One cover plate 300 forms the positive electrode cover plate 300 of the battery, and is mounted on the battery casing 500 via an insulating ring 200 and a connecting ring 100. The other cover plate 300 forms the negative electrode cover plate 300 of the battery, and is mounted on the battery casing 500 via another insulating ring 200 and another connecting ring 100. The other connecting ring 100 is used to connect the negative electrode cover plate 300 and the battery casing 500. The positive electrode cover plate 300 can increase the current-carrying surface area of ​​the positive electrode of the battery, thereby improving the current-carrying capacity of the battery and thus improving the battery's performance. Similarly, the negative electrode cover plate 300 can increase the current-carrying surface area of ​​the negative electrode of the battery, thereby improving the current-carrying capacity of the battery and thus improving the battery's performance.

[0286] Understandably, the specific functions of the cover plate 300 are not limited and can be selected according to actual usage needs.

[0287] It should be noted that the battery positive and negative electrodes provided in the embodiments of this application have a variety of different configurations. The configurations of the battery positive and negative electrodes will be illustrated below.

[0288] In one feasible implementation, the positive and negative terminals of a battery are arranged opposite each other, meaning they are located on two opposing surfaces of the battery. This arrangement of the positive and negative terminals offers the advantage of high safety.

[0289] In another feasible implementation, the positive and negative terminals of a battery are disposed on the same surface. This arrangement has the advantage of minimizing the contact space between the battery and the external environment, and also offers advantages in terms of space saving and compact structure when multiple batteries are connected.

[0290] Understandably, there are no restrictions on the configuration of the positive and negative terminals of the battery; they can be selected according to actual usage requirements.

[0291] Understandably, the positive electrode cover 300 of the battery is located on the side of the battery casing 500 near the positive electrode of the battery, and the negative electrode cover 300 of the battery is located on the side of the battery casing 500 near the negative electrode of the battery. Using this method, a continuous potential difference path can be formed between the positive and negative electrodes of the battery, thereby improving the battery performance.

[0292] The battery provided in the embodiments of this application also includes an explosion-proof valve 600, which is used to release the internal pressure by automatically opening when the internal pressure of the battery rises abnormally, so as to prevent the battery from exploding.

[0293] It should be noted that the explosion-proof valve 600 has a variety of different installation positions, and the installation positions of the explosion-proof valve 600 will be illustrated with examples below.

[0294] In one feasible implementation, the explosion-proof valve 600 is installed on the negative electrode cover plate 300, with one end of the explosion-proof valve 600 facing away from the negative electrode cover plate 300, and the other end of the explosion-proof valve 600 extending into the interior of the battery casing 500. The explosion-proof valve 600 can prevent the battery from exploding, thereby providing safety protection for the battery.

[0295] In another feasible implementation, the explosion-proof valve 600 is installed on the positive electrode cover plate 300, with one end of the explosion-proof valve 600 facing away from the positive electrode cover plate 300, and the other end of the explosion-proof valve 600 extending into the interior of the battery casing 500. The explosion-proof valve 600 can prevent the battery from exploding, thereby providing safety protection for the battery.

[0296] In addition, in other feasible embodiments, the explosion-proof valve 600 is installed on the battery housing 500. One end of the explosion-proof valve 600 is disposed facing away from the electrode core 502, and the other end of the explosion-proof valve 600 extends towards the side close to the electrode core 502. The explosion-proof valve 600 can prevent the battery from exploding, so as to protect the battery.

[0297] Understandably, there are no restrictions on the specific installation location of the explosion-proof valve 600; it can be selected according to actual usage requirements.

[0298] The battery provided in the embodiments of this application further includes an injection hole 700, which is used to add electrolyte toward the interior of the battery casing 500 and to prevent electrolyte from overflowing from the battery.

[0299] It should be noted that the injection port 700 has several different installation positions, and the installation positions of the injection port 700 will be illustrated with examples below.

[0300] In one feasible implementation, the electrolyte injection hole 700 is installed on the negative electrode cover plate 300. One end of the electrolyte injection hole 700 is set facing away from the negative electrode cover plate 300, and the other end of the electrolyte injection hole 700 extends into the interior of the battery housing 500. The setting of the electrolyte injection hole 700 can facilitate the operator to add electrolyte into the interior of the battery housing 500, and can prevent the electrolyte inside the battery from overflowing, so as to protect the battery.

[0301] In another feasible embodiment, the electrolyte injection hole 700 is installed on the positive electrode cover plate 300. One end of the electrolyte injection hole 700 is set facing away from the positive electrode cover plate 300, and the other end of the electrolyte injection hole 700 extends into the interior of the battery housing 500. The setting of the electrolyte injection hole 700 can facilitate the operator to add electrolyte into the interior of the battery housing 500, and can prevent the electrolyte inside the battery from overflowing, so as to protect the battery.

[0302] Understandably, there are no restrictions on the specific installation location of the injection port 700; it can be selected according to actual usage requirements.

[0303] The battery provided in the embodiments of this application further includes: terminals, which are used to connect the internal and external circuits of the battery and serve to transmit current in the circuit and lead out voltage.

[0304] It should be noted that the pole has a variety of different installation positions, and the installation positions of the pole will be illustrated with examples below.

[0305] In one feasible implementation, the terminal post is installed on the negative electrode cover plate 300, with one end of the terminal post facing away from the negative electrode cover plate 300 and the other end of the terminal post electrically connected to the negative electrode cover plate 300. The terminal post can connect the internal and external circuits of the battery, and play the role of transmitting current in the circuit and leading out voltage.

[0306] In another feasible implementation, the terminal post is installed on the positive electrode cover plate 300, with one end of the terminal post facing away from the positive electrode cover plate 300 and the other end of the terminal post electrically connected to the positive electrode cover plate 300. The terminal post can connect the internal and external circuits of the battery, and play the role of transmitting current in the circuit and leading out the voltage.

[0307] Understandably, there are no restrictions on the specific installation location of the pole; it can be selected according to actual usage needs.

[0308] An embodiment of this application provides a battery pack including the battery provided in the above embodiments.

[0309] It should be noted that the above embodiments provide multiple battery configurations, which are connected to form a battery pack. The multiple batteries in a battery pack have various different connection methods. The connection methods between two adjacent batteries will be illustrated below.

[0310] In one feasible implementation, two adjacent batteries are connected in parallel, that is, the positive terminal of one battery and the positive terminal of the other battery are connected by a connector, and the negative terminal of one battery and the negative terminal of the other battery are connected by another connector.

[0311] It is understandable that connecting two batteries in parallel allows the other batteries in the battery pack to continue functioning normally when one battery fails, thus providing the advantage of stable operation.

[0312] In another feasible implementation, two adjacent batteries are connected in series, that is, the positive terminal of one battery and the negative terminal of the other battery are connected by a connector, and the negative terminal of one battery and the positive terminal of the other battery are connected by another connector.

[0313] It is understandable that connecting two batteries in series can increase the voltage of the battery pack, thereby improving its performance.

[0314] Understandably, there are no restrictions on the specific connection method between multiple batteries in a battery pack, and it can be selected according to actual usage needs.

[0315] It should be noted that the connector is a metal part, which can make an conductive connection with the positive and negative terminals of the battery.

[0316] It should be noted that the negative electrode cover plate 300 and the positive electrode cover plate 300 provided in the embodiments of this application are made of different materials, so that the positive and negative electrodes of the battery can form a continuous potential difference path when they are electrically connected, thereby increasing the total potential difference of the battery pack and thus increasing the battery voltage and improving the battery performance.

[0317] It should be noted that the negative electrode cover 300 and the positive electrode cover 300 are made of various different materials. Examples of the materials of the negative electrode cover 300 and the positive electrode cover 300 will be given below.

[0318] In one feasible implementation, the negative electrode cover plate 300 is a copper cover plate 300, and the positive electrode cover plate 300 is an aluminum cover plate 300.

[0319] In another feasible implementation, the negative electrode cover plate 300 is a graphite cover plate 300, and the positive electrode cover plate 300 is a lithium iron phosphate cover plate 300.

[0320] Understandably, there are no restrictions on the materials of the negative electrode cover 300 and the positive electrode cover 300, and they can be selected according to actual usage requirements.

[0321] This application also provides an electrical device, including an electrical device and a battery or battery pack as described in any of the above embodiments, wherein the battery or battery pack is used to provide electrical energy to the electrical device.

[0322] The electrical equipment in this application 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 device can be the vehicle's drive mechanism or the vehicle's control system.

[0323] 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.

[0324] Since the electrical device in this embodiment includes the battery or battery pack described in any of the above embodiments, the electrical device includes the battery structure and beneficial effects, which will not be described in detail here.

[0325] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0326] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0327] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended 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. 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 application.

Claims

1. A battery cover assembly, characterized in that, A battery housing (500) for mounting on a battery, the battery cover assembly comprising: A connecting ring (100) is used to connect the battery housing (500); An insulating ring (200) is connected to the battery housing (500) via the connecting ring (100), and the insulating ring (200) has an annular cavity (202); A cover plate (300) is connected to the insulating ring (200), and at least a portion of the cover plate (300) is connected to the battery tab (501) through the ring cavity (202); A limiting structure (400) is located in the battery housing (500) and forms an opening for the tab (501) to pass through.

2. The battery cover assembly according to claim 1, characterized in that, It also includes a limiting member connected to the interior of the battery housing (500) and connected to at least one of the connecting ring (100) and the insulating ring (200); the limiting structure (400) is formed on the side of the limiting member away from the battery housing (500).

3. The battery cover assembly according to claim 1, characterized in that, The insulating ring (200) has an extension (201) at least part of which is located in the battery housing (500) and forms the limiting structure (400).

4. A battery cover assembly according to any one of claims 1 to 3, characterized in that, The limiting structure (400) is an insulating component.

5. A battery cover assembly according to any one of claims 1 to 3, characterized in that, The limiting structure (400) includes a first limiting part (401) and a second limiting part (402), the first limiting part (401) and the second limiting part (402) are disposed opposite to each other, and the first limiting part (401) and the second limiting part (402) surround to form the opening.

6. A battery cover assembly according to any one of claims 1 to 3, characterized in that, The limiting structure (400) is annular, and the inner ring of the annulus forms the opening.

7. A battery cover assembly according to any one of claims 1 to 3, characterized in that, The limiting structure (400) has a guiding surface (403) for facing the electrode core (502) of the battery, and at least a portion of the tabs (501) extend along the guiding surface (403).

8. A battery cover assembly according to claim 7, characterized in that, The guide surface (403) is inclined and extends from the limiting structure (400) toward the side closer to the tab (501).

9. A battery cover assembly according to any one of claims 1 to 3, characterized in that, The connecting ring (100) is a metal part.

10. A battery cover assembly according to any one of claims 1-9, characterized in that, The insulating ring (200) has a guide portion (203), at least a portion of which is located in the battery housing (500). The guide portion (203) is used to guide the connection between the battery tab (501) and the cover plate (300).

11. A battery cover assembly according to claim 10, characterized in that, At least a portion of the insulating ring (200) is constricted along the direction from the cover plate (300) to the electrode core (502) of the battery.

12. A battery cover assembly according to any one of claims 1-9, characterized in that, The insulating ring (200) includes: a first ring body (204) and a second ring body (205), wherein the first ring body (204) is connected to the second ring body (205); the inner ring of the first ring body (204) and the inner ring of the second ring body (205) enclose to form the annular cavity (202); The second ring (205) is located on the side of the first ring (204) away from the electrode core (502) of the battery; At least a portion of the second ring (205) protrudes from the first ring (204) along a direction perpendicular to the cover plate (300) to the battery core (502).

13. A battery cover assembly according to claim 12, characterized in that, The cover plate (300) includes a first part (301) and a second part (302), the second part (302) being connected to the periphery of the first part (301); The first part (301) passes through the inner ring of the first ring body (204) and the inner ring of the second ring body (205), and is connected to the electrode tab (501) of the battery. The second part (302) is connected to at least one of the first ring body (204) and the second ring body (205).

14. A battery cover assembly according to claim 12, characterized in that, The connecting ring (100) has an inner surface (101) and an outer surface (102), the inner surface (101) and the outer surface (102) being connected; The inner surface (101) is connected to the periphery of the first ring body (204); And / or, the outer surface (102) is connected to the second ring body (205).

15. A battery cover assembly according to claim 14, characterized in that, The outer surface (102) is connected to the battery casing (500).

16. A battery cover assembly according to any one of claims 1-9, characterized in that, The insulating ring (200) has a guide portion (206) along the direction from the battery core (502) to the cover plate (300), at least a portion of the guide portion (206) protruding from the insulating ring (200), and the cover plate (300) is connected to the guide portion (206).

17. A battery cover assembly according to any one of claims 1-9, characterized in that, The cover plate (300) has a first maximum length L1, and the connection between the battery tab (501) and the battery core (502) has a second maximum length L2. The first maximum length L1 and the second maximum length L2 satisfy the following condition: 1 > L2 / L1 ≥ 0.

8.

18. A battery cover assembly according to claim 17, characterized in that, The battery core (502) has a third maximum length L3, and the third maximum length L3 and the second maximum length L2 satisfy the following condition: 1≥L2 / L3≥0.

8.

19. A battery cover assembly according to any one of claims 1-9, characterized in that, The cover plate (300) located in the inner ring of the insulating ring (200) has a projected area of ​​S1 on the surface where the outer top wall of the insulating ring (200) is located; The outer ring of the insulating ring (200) has a projected area of ​​S2 on the surface where the outer top wall of the insulating ring (200) is located. The following condition holds true between S1 and S2: 1 / 10 ≤ S1 / S2 ≤ 1 / 2.

20. A battery cover assembly according to any one of claims 1-9, characterized in that, The cover plate (300) located in the inner ring of the insulating ring (200) has a projected area S1 on the surface where the outer top wall of the insulating ring (200) is located, which satisfies the following condition: S1≥50 square millimeters.

21. A battery cover assembly according to any one of claims 1-9, characterized in that, Along the direction perpendicular to the cover plate (300) to the electrode core (502) of the battery, the cover plate (300) has a minimum cross-sectional end face, and the current-carrying area S3 of the minimum cross-sectional end face of the cover plate (300) satisfies: S3≥I / N; Where I is the required continuous current of the battery, in A; N is the current carrying capacity of the cover plate (300), in A / mm. 2 .

22. A battery cover assembly according to any one of claims 1-9, characterized in that, The battery core (502) has a connection surface that connects to the battery tab (501), and the outer side wall of the battery tab (501) and the connection surface are set at an angle θ. The included angle θ satisfies: 95°≥θ≥80°.

23. A battery cover assembly according to any one of claims 1-9, characterized in that, The battery core (502) has a connection surface that connects to the battery tab (501), and the outer side wall of the battery tab (501) and the connection surface are set at an angle θ. The included angle θ satisfies: 95°≥θ≥90°.

24. A battery cover assembly according to any one of claims 1-9, characterized in that, The cover plate (300) is provided with a buffer groove (303), which is located on at least one side of the cover plate (300) that is close to or away from the battery housing (500).

25. A battery comprising a battery housing (500) and a battery cover assembly according to any one of claims 1-24, the battery cover assembly being disposed on the battery housing (500).

26. A battery pack, characterized in that, Includes the battery as described in claim 25.

27. An electrical appliance, characterized in that, The device includes an electrical appliance, the battery of claim 25 or the battery pack of claim 26, wherein the battery or the battery pack is used to provide electrical energy to the electrical appliance.

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