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

Abstract

The invention provides a battery cover plate assembly, a battery and electric equipment. The battery cover plate assembly is used for being mounted on a battery shell of a battery and comprises a connecting piece, an insulating ring, a cover plate and a limiting structure, wherein the connecting ring is used for connecting a battery shell; the insulating ring is connected to the battery shell through the connecting ring and is provided with a ring cavity; the cover plate is connected to the insulating ring, and at least part of the cover plate is connected with a tab of the battery through the ring cavity; the limiting structure is positioned in the battery shell and forms an opening for the tab to penetrate through; the connecting ring is used for reducing the connecting difficulty between the battery shell and the insulating ring; the insulating ring is used for insulating and connecting the cover plate and the battery shell so as to reduce the occurrence of battery short circuit; the cover plates are used for forming anodes and cathodes of the batteries; the limiting structure is used for guiding the installation of the tab; the cover plate has the advantages of being easy and convenient to install, high in machining efficiency and high in safety, and therefore the problems that the number of parts of the cover plate is large, the structure is complex, and the cover plate machining difficulty is large and the machining efficiency is low can be solved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery technology, and in particular to a battery cover assembly, a battery, a battery pack, and an electrical device. Background Art

[0002] Battery is the power source that provides power for tools, mostly referring to the storage battery or rechargeable battery that powers electric cars, electric trains, electric bicycles, and golf carts.

[0003] Current batteries are generally composed of structural parts such as cover plates and aluminum shells; among them, the existing cover plates are mainly composed of limit parts, light cover plates, sealing rings, terminals, insulating parts, lead-out plates, explosion-proof valves, explosion-proof valve protection plates, poles and other components.

[0004] In the related art, the cover plate has many parts and a complex structure, resulting in problems such as great difficulty in cover plate processing and low processing efficiency. Summary of the Invention

[0005] The embodiments of the present application provide a battery cover assembly, a battery, a battery pack and an electrical device, which can solve the problems of many cover components, complex structure, difficulty in cover processing and low processing efficiency.

[0006] The embodiments of this application provide the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a battery cover assembly for installation on a battery housing of a battery, the battery cover assembly comprising:

[0008] A connecting ring, used for connecting to a battery housing;

[0009] An insulating ring connected to the battery housing via a connecting ring, the insulating ring having a ring cavity;

[0010] A cover plate is connected to the insulating ring, and at least a portion of the cover plate is connected to the battery tab through the ring cavity;

[0011] The limiting structure is located in the battery shell and forms an opening for the tab to pass through.

[0012] In the battery cover assembly of this structure, the connecting ring is used to connect the battery shell and the insulating ring to reduce the difficulty of connecting the battery shell and the insulating ring; the insulating ring is used to insulate the connecting cover and the battery shell to reduce the occurrence of battery short circuit; the cover is used to connect with the battery core through the pole ear to form the positive and negative poles of the battery to meet the normal use of the battery; the limiting structure is used to guide the installation of the pole ear to reduce the occurrence of battery short circuit caused by contact between the pole ear and the pole core or the battery shell, and has the advantages of easy installation and high processing efficiency.

[0013] In a feasible embodiment, a limiting member is further included, which is connected to the inside of the battery shell and is connected to at least one of the connecting ring and the insulating ring; the limiting member forms a limiting structure on the side away from the battery shell.

[0014] The battery cover assembly of this structure uses a limiter to accommodate and protect the tabs to reduce the occurrence of tab damage caused by external collisions, thereby improving the safety of the tabs and increasing the service life of the battery.

[0015] In a feasible embodiment, the insulating ring has an extension portion, at least a portion of the extension portion is located in the battery housing, and the extension portion forms a limiting structure.

[0016] In the battery cover assembly of this structure, the insulating ring extends toward the side close to the pole core, and the extension portion extends toward the side close to the pole ear. The insulating ring is used to form a ring cavity to isolate the connection between the pole ear and the battery shell, thereby reducing the occurrence of battery short circuit; the extension portion is used to form a limiting structure to accommodate and protect the pole ear.

[0017] In a feasible implementation manner, the limiting structure is an insulating member.

[0018] The battery cover assembly of this structure has an insulating member 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 safely, and extending the battery life.

[0019] In a feasible embodiment, the limiting structure includes a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion are arranged opposite to each other, and the first limiting portion and the second limiting portion enclose each other to form an opening.

[0020] In the battery cover assembly of this structure, the tab is arranged inside the opening, the first limiting portion is used to limit the deviation of the tab toward the side away from the second limiting portion, and the second limiting portion is used to limit the deviation of the tab toward the side away from the first limiting portion, thereby reducing the contact between the tab and other components in the battery, reducing the occurrence of battery short circuit, and thus protecting the battery safely.

[0021] In a feasible embodiment, the limiting structure is annular, and the inner ring of the annular structure forms an opening.

[0022] In the battery cover assembly of this structure, the tab is arranged inside the opening, and the annular inner ring can limit the displacement of the tab inside the battery shell to limit the contact between the tab and other components in the battery, thereby reducing the occurrence of battery short circuits and thus protecting the battery safely.

[0023] In a feasible embodiment, the limiting structure has a guiding surface, the guiding surface is used to face the pole core of the battery, and at least a portion of the pole lug extends along the guiding surface.

[0024] The battery cover assembly of this structure has a guide surface that can guide the tab to extend toward the side close to the cover, thereby reducing the bending of the tab and reducing the occurrence of battery short circuit caused by contact between the tab and the core, thereby improving the safety of the battery and extending the battery life.

[0025] In a feasible embodiment, the guide surface is arranged at an angle, and the guide surface is extended from the limiting structure toward a side close to the tab.

[0026] In the battery cover assembly of this structure, the guide surface is used to limit the offset of the pole ear to reduce the occurrence of pole ear bending, and the guide surface can gather the pole ear to reduce the occurrence of battery short circuit caused by contact between the pole ear and other components in the battery.

[0027] In a feasible embodiment, the connecting ring is a metal part.

[0028] In the battery cover assembly of this structure, the provision of the metal ring can reduce the difficulty of connecting the connecting ring and the battery shell, thereby improving the processing efficiency between the battery cover assembly and the battery shell.

[0029] In a possible embodiment, the insulating ring has a guide portion, at least a portion of which is located in the battery housing, and the guide portion is used to guide the connection between the battery tab and the cover plate.

[0030] In the battery cover assembly of this structure, the setting of the guide portion can guide the connection between the battery tab and the cover to isolate the connection between the tab and the battery shell, thereby reducing the occurrence of battery short circuit.

[0031] In a feasible embodiment, at least a portion of the insulating ring is configured to be constricted along a direction from the cover plate to the pole core of the battery.

[0032] In the battery cover assembly of this structure, at least part of the insulating ring is configured to be tapered, which can extend the setting length of the insulating ring to isolate the connection between the pole ear and the shell, thereby providing insulation protection for the battery and extending the service life of the battery; and can reduce the space occupied by the insulating ring to reduce the processing cost of the insulating ring, and can reduce the overall weight of the battery cover assembly, thereby achieving a lightweight battery.

[0033] In a feasible embodiment, the insulating ring includes: a first ring body and a second ring body, the first ring body is connected to the second ring body; the inner ring of the first ring body and the inner ring of the second ring body enclose a ring cavity;

[0034] The second ring body is located on a side of the first ring body away from the battery core;

[0035] Along the direction from the vertical cover plate to the pole core of the battery, at least a portion of the second ring body protrudes from the first ring body.

[0036] In the battery cover assembly of this structure, the arrangement of the first ring body and the second ring body can increase the connection area with the connecting ring, thereby reducing the difficulty of connection between the connecting ring and the insulating ring, so as to improve the processing efficiency of the battery cover assembly; and can isolate the direct contact between the cover and the connecting ring to insulate and protect the battery, thereby extending the service life of the battery.

[0037] In a feasible embodiment, the cover plate includes a first portion and a second portion, wherein the second portion is connected to a peripheral side of the first portion;

[0038] The first portion is connected to at least one of the first ring body and the second ring body;

[0039] The second portion passes through the inner ring of the first ring body and the inner ring of the second ring body respectively, and is connected to the tab of the battery.

[0040] In the battery cover assembly of this structure, the second part is connected to the circumferential side of the first part, which can increase the area of the cover, thereby increasing the area of the connection between the cover and the insulating ring, thereby 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 service life of the battery.

[0041] In a feasible embodiment, the connecting ring has an inner surface and an outer surface, and the inner surface and the outer surface are connected;

[0042] The inner surface is connected to the circumference of the first ring body;

[0043] And / or, the outer surface is connected to the second ring body.

[0044] The battery cover assembly of this structure has an inner and outer surface arrangement that can increase the connection area between the connecting ring and the insulating ring to improve the connection strength between the connecting ring and the insulating ring, and can reduce the connection difficulty between the connecting ring and the insulating ring to improve the installation efficiency of the battery cover assembly.

[0045] In a possible embodiment, the outer surface is connected to the battery housing.

[0046] In the battery cover assembly of this structure, the battery shell is located on the side of the outer surface away from the insulating ring, and the outer surface is connected to the battery shell, which can reduce the difficulty of connecting between the connecting ring and the battery shell, thereby improving the processing efficiency between the battery cover assembly and the battery shell.

[0047] In a feasible embodiment, the insulating ring has a guide portion, and along the direction from the battery core to the cover plate, at least a portion of the guide portion protrudes from the insulating ring, and the cover plate is connected to the guide portion.

[0048] In the battery cover assembly of this structure, the setting of the guide portion can support the installation of the cover and play a role in guiding the installation position of the cover, thereby improving the installation efficiency of the battery cover assembly.

[0049] In a feasible embodiment, 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, and the first maximum length L1 and the second maximum length L2 satisfy:

[0050] 1>L2 / L1≥0.8.

[0051] The battery cover plate assembly of this structure satisfies the following relationship between the first maximum length L1 and the second maximum length L2: 1>L2 / L1≥0.8; the connection area at the connection between the cover plate and the tab is increased, thereby increasing the flow area of the cover plate and making the current-carrying surface of the cover plate larger, thereby improving the performance of the battery; and the difficulty of connecting the tab and the cover plate is reduced, which has the advantage of convenient processing.

[0052] In a feasible embodiment, the battery core has a third maximum length L3, and the third maximum length L3 and the second maximum length L2 satisfy the following:

[0053] 1≥L2 / L3≥0.8.

[0054] The battery cover assembly of this structure satisfies the following conditions between the third maximum length L3 and the second maximum length L2: 1≥L2 / L3≥0.8; the connection area at the connection between the tab and the pole core body can be increased, and the current-carrying surface between the tab and the pole core body can be enlarged, thereby improving the performance of the battery; while increasing the connection area at the connection between the tab and the pole core body, the connection area between the side of the tab away from the pole core body and the cover assembly can be increased, thereby improving the performance of the battery.

[0055] In a feasible embodiment, the cover plate located in the inner ring of the insulating ring has an orthographic projection area S1 on the surface where the outer top wall of the insulating ring is located;

[0056] The outer ring of the insulating ring has an orthographic projection area S2 on the surface where the outer top wall of the insulating ring is located;

[0057] The relationship between S1 and S2 is: 1 / 10≤S1 / S2≤1 / 2.

[0058] In this battery cover assembly structure, the cover located within the inner ring of the insulating ring has an orthographic projection area S1 on the surface of the insulating ring's outer top wall; the outer ring of the insulating ring has an orthographic projection area S2 on the surface of the insulating ring's outer top wall. The relationship between S1 and S2 satisfies the following: 1 / 10 ≤ S1 / S2 ≤ 1 / 2. This arrangement increases the area of the cover, thereby increasing its flow area and thus its current-carrying surface, thereby enhancing its current-carrying capacity and, consequently, the performance of the battery cover assembly. This increased current-carrying surface reduces battery temperature, thereby extending battery life and improving battery safety.

[0059] In a feasible embodiment, the cover plate located in the inner ring of the insulating ring has an orthographic projection area S1 on the surface where the outer top wall of the insulating ring is located that satisfies:

[0060] S1≥50 square millimeters.

[0061] In the battery cover assembly of this structure, the cover located in the inner ring of the insulating ring is connected to the battery core through the pole ear. Increasing the area of the cover located in the inner ring of the insulating ring can increase the flow area of the cover, thereby making the current-carrying surface of the cover larger, so as to improve the current-carrying capacity of the cover, thereby improving the performance of the battery cover assembly.

[0062] In a feasible embodiment, the cover plate has a minimum cross-sectional end surface along the direction from the vertical cover plate to the battery core, and the current-carrying area S3 of the minimum cross-sectional end surface of the cover plate satisfies;

[0063] S3≥I / N;

[0064] Where I is the continuous current that the battery needs to meet, in A; N is the current carrying coefficient of the cover, in A / mm 2 .

[0065] The battery cover assembly of this structure can increase the area of the cover by making S3 satisfy; S3 ≥ I / N, thereby increasing the flow area of the cover, thereby making the current-carrying surface of the cover larger, so as to improve the current-carrying capacity of the cover, thereby improving the performance of the battery cover assembly; and the size of the minimum cross-sectional end face of the cover can be selected according to the continuous current that the battery needs to meet and the current-carrying coefficient of different cover materials, which can avoid wasting the conductive material for making the cover body, thereby reducing the production cost of the cover, and can reduce the overall weight of the cover assembly, thereby reducing the weight of the battery, so that the battery can be lightweight.

[0066] In a feasible embodiment, the battery core has a connection surface connected to the battery tab, and the outer side wall of the battery tab and the connection surface are arranged at an angle θ;

[0067] The included angle θ satisfies: 95°≥θ≥80°.

[0068] The battery cover assembly of this structure can reduce the occurrence of tab bending to improve battery safety by setting an angle between the connection surface and the outer wall of the tab; and can avoid the occurrence of battery short circuit caused by contact between the tab and the pole core, thereby extending the service life of the battery.

[0069] In a feasible embodiment, the battery core has a connection surface connected to the battery tab, and the outer side wall of the battery tab and the connection surface are arranged at an angle θ;

[0070] The included angle θ satisfies: 95°≥θ≥90°.

[0071] The battery cover assembly of this structure can reduce the occurrence of tab bending to improve battery safety by setting an angle between the connection surface and the outer wall of the tab; and can avoid the occurrence of battery short circuit caused by contact between the tab and the pole core, thereby extending the service life of the battery.

[0072] In a feasible embodiment, a buffer groove is formed on the cover plate, and the buffer groove is located on at least one side of the cover plate close to the battery housing or away from the battery housing.

[0073] In the battery cover assembly of this structure, the buffer groove on the cover can accommodate the deformation caused by the insulating ring squeezing the cover toward one side of the cover under high and low temperature impact, and release the stress on the insulating ring to reduce the occurrence of cracking of the insulating ring, thereby improving the battery yield and extending the battery life.

[0074] A second aspect of an embodiment of the present application provides a battery, comprising a battery housing and a battery cover assembly, wherein the battery cover assembly is disposed on the battery housing.

[0075] A third aspect of the embodiments of the present application provides a battery pack including a battery.

[0076] A fourth aspect of an embodiment of the present application provides an electrical device, including an electrical device, a battery or a battery pack, where the battery or the battery pack is used to provide electrical energy to the electrical device.

[0077] In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the battery cover assembly, battery, battery pack and electrical equipment provided by the embodiments of the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0079] Figure 1 This is a schematic diagram of the main structure of a battery provided in an embodiment of the present application;

[0080] Figure 2 The embodiments of this application provide Figure 1 Cross-sectional view of section AA;

[0081] Figure 3 The embodiments of this application provide Figure 2 Schematic diagram of the enlarged structure at B in the middle;

[0082] Figure 4 This is a schematic diagram of the main structure of the insulating ring provided in an embodiment of the present application;

[0083] Figure 5 The second schematic diagram of the main structure of the insulating ring provided in the embodiment of the present application;

[0084] Figure 6 A schematic diagram of the main structure of the cover plate provided in an embodiment of the present application;

[0085] Figure 7 This is a schematic top view of the connection structure between the cover plate and the insulating ring provided in an embodiment of the present application;

[0086] Figure 8 The embodiments of this application provide Figure 7 Cross-sectional view of the CC section;

[0087] Figure 9 A second schematic top view of the connection structure between the cover plate and the insulating ring provided in an embodiment of the present application;

[0088] Figure 10 The embodiments of this application provide Figure 9 Cross-sectional view of the middle DD section;

[0089] Figure 11 A schematic diagram of the main structure of the connecting ring provided in an embodiment of the present application;

[0090] Figure 12 A schematic diagram of the connection structure of the connection between the electrode core, the electrode tab and the cover plate provided in an embodiment of the present application;

[0091] Figure 13A schematic diagram showing the distribution of an orthographic projection area S1 of a cover plate located in the inner ring of an insulating ring provided in an embodiment of the present application on the surface where the outer top wall of the insulating ring is located;

[0092] Figure 14 A schematic diagram showing the distribution of an orthographic projection area S2 of the outer ring of the insulating ring provided in an embodiment of the present application on the surface where the outer top wall of the insulating ring is located;

[0093] Figure 15 A schematic diagram of the distribution position of the current-carrying area S3 of the minimum cross-sectional end surface of the cover plate provided in an embodiment of the present application;

[0094] Figure 16 A schematic diagram of the installation structure of the buffer tank provided in an embodiment of the present application;

[0095] Figure 17 The second schematic diagram of the main structure of the battery provided in the embodiment of the present application;

[0096] Figure 18 This is a schematic diagram of the exploded structure of the connecting ring, insulating ring and cover plate provided in an embodiment of the present application;

[0097] Figure 19 The third schematic diagram of the main structure of the battery provided in the embodiment of the present application;

[0098] Figure 20 The second exploded structural diagram of the connecting ring, insulating ring and cover plate provided in the embodiment of the present application;

[0099] Figure 21 The fourth schematic diagram of the main structure of the battery provided in the embodiment of the present application;

[0100] Figure 22 The second schematic diagram of the exploded structure of the connecting ring, insulating ring and cover plate provided in the embodiment of the present application.

[0101] Description of reference numerals:

[0102] 100 - connecting ring; 101 - inner surface; 102 - outer surface; 1021 - first outer surface; 1022 - second outer surface;

[0103] 200 - insulating ring; 201 - extension portion; 202 - ring cavity; 203 - guide portion; 204 - first ring body; 205 - second ring body; 206 - guide portion;

[0104] 300-cover plate; 301-first part; 302-second part; 303-buffer tank;

[0105] 400-limiting structure; 401-first limiting portion; 402-second limiting portion; 403-guide surface;

[0106] 500-battery housing; 501-ear; 502-core;

[0107] 600-explosion-proof valve;

[0108] 700- injection hole;

[0109] L1 - first maximum length;

[0110] L2 - second maximum length;

[0111] L3 - third maximum length;

[0112] θ-angle;

[0113] S1-the orthographic projection area of the cover plate located in the inner circle of the insulating ring on the surface of the outer top wall of the insulating ring;

[0114] S2- the outer ring of the insulating ring, the orthographic projection area on the surface where the outer top wall of the insulating ring is located;

[0115] S3-The current-carrying area of the minimum cross-sectional end surface of the cover. DETAILED DESCRIPTION

[0116] Battery is the power source that provides power for tools, mostly referring to the storage battery or rechargeable battery that powers electric cars, electric trains, electric bicycles, and golf carts.

[0117] Current batteries are generally composed of structural parts such as cover plates and aluminum shells; among them, the existing cover plates are mainly composed of limit parts, light cover plates, sealing rings, terminals, insulating parts, lead-out plates, explosion-proof valves, explosion-proof valve protection plates, poles and other components.

[0118] In the related art, the cover plate has many parts and a complex structure, resulting in problems such as great difficulty in cover plate processing and low processing efficiency.

[0119] In related technologies, the electrode core is located within 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 sheets, multiple negative electrode sheets, and multiple separators. A separator is placed between each positive electrode sheet and each negative electrode sheet to prevent direct contact between the positive and negative electrode sheets, which could cause a short circuit in the battery.

[0120] The battery cover assembly provided in the embodiment of the present application has a connecting ring for connecting the battery shell and the insulating ring to reduce the difficulty of connecting the battery shell and the insulating ring; the insulating ring is used to insulate the cover plate and the battery shell to reduce the occurrence of battery short circuit; the cover plate is used to be connected to the battery core through the pole ear to form the positive and negative poles of the battery to meet the normal use of the battery; the limiting structure is used to guide the installation of the pole ear to reduce the occurrence of battery short circuit caused by contact between the pole ear and the pole core or the battery shell, thereby improving the safety of the battery and extending the service life of the battery.

[0121] like Figure 1 、 Figure 2 and Figure 3 As shown, the battery cover assembly provided in the embodiment of the present application is used to be installed on the battery housing 500 of the battery. The battery cover assembly includes: a connector, an insulating ring 200, a cover 300 and a limiting structure 400. Among them, the connecting ring 100 is used to connect the battery housing 500; the insulating ring 200 is connected to the battery housing 500 through the connecting ring 100, and the insulating ring 200 has an annular cavity 202; the cover 300 is connected to the insulating ring 200, and at least a portion of the cover 300 is connected to the battery tab 501 through the annular cavity 202; the limiting structure 400 is located in the battery housing 500 and forms an opening for the tab 501 to pass through.

[0122] like Figure 4 As shown, it should be noted that the annular cavity 202 is arranged in the inner ring of the insulating ring 200, and the annular cavity 202 is used to isolate the connection between the pole ear 501 and the battery shell 500 to reduce the occurrence of battery short circuit; and the setting of the annular cavity 202 can accommodate and protect the pole ear 501 to reduce the occurrence of damage to the pole ear 501 caused by external collision, thereby improving the safety of the pole ear 501 and increasing the service life of the battery.

[0123] It should be noted that there are many different connection methods between the cover plate 300 and the insulating ring 200. The connection methods between the cover plate 300 and the insulating ring 200 are described below with examples.

[0124] In a feasible embodiment, the cover plate 300 and the insulating ring 200 are fixedly connected by brazing; the use of brazing can reduce the connection thickness between the cover plate 300 and the insulating ring 200, thereby reducing the external space occupied.

[0125] In another feasible embodiment, the cover plate 300 and the insulating ring 200 are bonded together using glue. Using glue for bonding has the advantage of convenient connection, thereby improving the installation efficiency of the cover plate 300 and the insulating ring 200.

[0126] In addition, in other feasible embodiments, the cover plate 300 and the insulating ring 200 are connected by hot melt. The use of hot melt connection has the advantages of strong connection stability and batch processing, which can improve the processing efficiency between the cover plate 300 and the insulating ring 200.

[0127] It is understandable that there is no restriction on the specific connection method between the cover plate 300 and the insulating ring 200 , and it can be selected according to actual use requirements, as long as the cover plate 300 and the insulating ring 200 are fixedly connected.

[0128] It should be noted that there are many different connection methods between the connecting ring 100 and the insulating ring 200. The connection methods between the connecting ring 100 and the insulating ring 200 are described below with examples.

[0129] In a feasible embodiment, the connecting ring 100 and the insulating ring 200 are fixedly connected by brazing; the use of brazing can reduce the connection thickness between the connecting ring 100 and the insulating ring 200, thereby reducing the external space occupied.

[0130] In another feasible embodiment, the connecting ring 100 and the insulating ring 200 are bonded together using glue. Using glue for bonding has the advantage of convenient connection, thereby improving the installation efficiency of the connecting ring 100 and the insulating ring 200.

[0131] In addition, in other feasible embodiments, the connecting ring 100 and the insulating ring 200 are connected by hot melt. The use of hot melt connection has the advantages of strong connection stability and batch processing, which can improve the processing efficiency between the connecting ring 100 and the insulating ring 200.

[0132] It is understandable that there is no restriction on the specific connection method between the connecting ring 100 and the insulating ring 200 , and it can be selected according to actual use requirements, as long as the connecting ring 100 and the insulating ring 200 are fixedly connected.

[0133] It should be noted that the connector and the battery shell 500 are connected by low-temperature welding. Low-temperature welding can reduce the damage to the pole core 502 and the pole tab 501 in the battery shell 500 caused by high temperature, so as to safely protect the pole core 502 and the pole tab 501 in the battery shell 500, thereby improving the connection efficiency between the battery shell 500 and the connector, thereby improving the yield of the battery pack.

[0134] It should be noted that the connecting ring 100 is a metal ring. The provision of the metal ring can reduce 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 .

[0135] It should be noted that the cover plate 300 is a conductive material, which 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 transmitting current and drawing out voltage.

[0136] It should be noted that the insulating ring 200 is an insulating material or a weakly conductive material. The insulating ring 200 is used to isolate the cover plate 300 from direct contact with the battery housing 500, and the insulating ring 200 can insulate the battery housing 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 life.

[0137] It should be noted that the limiting structure 400 is used to form an opening for the pole ear 501 to pass through. The setting of the opening can accommodate and protect the pole ear 501 to reduce the occurrence of damage to the pole ear 501 caused by external collisions, thereby improving the safety of the pole ear 501 and increasing the service life of the battery.

[0138] The battery cover assembly provided in the embodiment of the present application further includes a limiting member, which is connected to the interior of the battery housing 500 , and a limiting structure 400 is formed on a side of the limiting member facing away from the battery housing 500 .

[0139] It is understandable that the limiting member is used to 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 increasing the service life of the battery.

[0140] It should be noted that the limiting member has a variety of different installation positions. The installation positions of the limiting member are described below with examples.

[0141] In a feasible embodiment, the limiting member is connected to the connecting ring 100 , and the connecting ring 100 is used to support the limiting member so that the limiting member can form a limiting structure 400 to accommodate and protect the tab 501 .

[0142] In another feasible embodiment, the limiting member is connected to the insulating ring 200 , and the insulating ring 200 is used to support the limiting member so that the limiting member can form a limiting structure 400 to accommodate and protect the tab 501 .

[0143] In addition, in other feasible embodiments, the limiting member is connected to the connecting ring 100 and the insulating ring 200 respectively, and 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.

[0144] It is understandable that there is no restriction on the specific installation position of the limiter, and it can be selected according to actual use requirements, as long as the limiter can accommodate and protect the tab 501.

[0145] It should be noted that the insulating ring 200 provided in the embodiment of the present application has an extension portion 201 , at least part of the extension portion 201 is located in the battery housing 500 , and the extension portion 201 forms a limiting structure 400 .

[0146] It should be noted that the insulating ring 200 is extended toward the side close to the pole core 502, and the extension portion 201 is extended toward the side close to the pole ear 501. The insulating ring 200 is used to form an annular cavity 202 to isolate the connection between the pole ear 501 and the battery shell 500, thereby reducing the occurrence of battery short circuit; the extension portion 201 is used to form a limiting structure 400 to accommodate and protect the pole ear 501.

[0147] The limiting structure 400 provided in the embodiment of the present application is an insulating part. The setting of the insulating part can isolate the electrical connection between the tab 501 and other conductive metals in the battery, thereby reducing the occurrence of battery short circuit, protecting the battery safely, and extending the service life of the battery.

[0148] The limiting structure 400 provided in the embodiment of the present application has a variety of different configurations. The configurations of the limiting structure 400 are described below with examples.

[0149] In a feasible embodiment, the limiting structure 400 includes a first limiting portion 401 and a second limiting portion 402, and the first limiting portion 401 and the second limiting portion 402 are arranged relative to each other, and the first limiting portion 401 and the second limiting portion 402 are enclosed to form an opening; the pole ear 501 is arranged inside the opening, and the first limiting portion 401 is used to limit the deviation of the pole ear 501 toward the side away from the second limiting portion 402, and the second limiting portion 402 is used to limit the deviation of the pole ear 501 toward the side away from the first limiting portion 401, thereby reducing the contact between the pole ear 501 and other components in the battery, so as to reduce the occurrence of battery short circuit, thereby protecting the battery safely.

[0150] In another feasible embodiment, the limiting structure 400 is annular, the inner ring of the ring forms an opening, and the pole ear 501 is arranged inside the opening. The inner ring of the ring can limit the offset of the pole ear 501 inside the battery shell 500 to limit the contact between the pole ear 501 and other components in the battery to reduce the occurrence of battery short circuit, thereby providing safety protection for the battery.

[0151] In addition, in other feasible embodiments, there are two limiting structures 400, one of which includes a first limiting portion 401 and a second limiting portion 402, and the first limiting portion 401 and the second limiting portion 402 are arranged opposite to each other, and the first limiting portion 401 and the second limiting portion 402 are enclosed to form an opening; the other limiting structure 400 is annular, and the inner circle of the annular shape forms another opening; the pole ear 501 is respectively accommodated inside the two openings, and the two openings can respectively limit the contact between the pole ear 501 and other components in the battery to reduce the occurrence of battery short circuit, thereby protecting the battery safely.

[0152] It is understandable that there is no restriction on the specific configuration of the limiting structure 400 and it can be selected according to actual use requirements, as long as the limiting structure 400 can limit the contact between the tab 501 and other components in the battery.

[0153] The limiting structure 400 provided in the embodiment of the present application has a guiding surface 403 , which is used to face the pole core 502 of the battery, and at least a portion of the pole lug 501 extends along the guiding surface 403 .

[0154] It can be understood that the setting of the guide surface 403 can guide the tab 501 to extend toward the side close to the cover plate 300, thereby reducing the bending of the tab 501, and reducing the occurrence of battery short circuit caused by contact between the tab 501 and the pole core 502, thereby improving the safety of the battery and extending the service life of the battery.

[0155] The guide surface 403 provided in the embodiment of the present application is arranged obliquely, and the guide surface 403 is extended from the limiting structure 400 toward a side close to the tab 501 .

[0156] It should be noted that a gap is set between the guide surface 403 and the battery shell 500 to reduce the deformation caused by the collision of the battery shell 500 and the extrusion of the limiting structure 400, which causes the guide surface 403 to squeeze the tab 501, causing the tab 501 to contact the pole core 502 and cause a battery short circuit.

[0157] It should be noted that, in the direction from the pole core 502 to the cover plate 300, the limiting structure 400 is at least partially flared, and the surface of the limiting structure 400 facing the pole core 502 is a guide surface 403, that is, in the direction from the pole core 502 to the cover plate 300, a first distance is formed between the guide surface 403 on the side relatively close to the battery shell 500 and the pole core 502, and a second distance is formed between the guide surface on the side relatively far away from the battery shell 500 and the pole core 502, and the first distance is less than or equal to the second distance.

[0158] It is understandable that the guide surface 403 is used to limit the offset of the tab 501 to reduce the bending of the tab 501, and the guide surface 403 can gather the tab 501 to reduce the contact between the tab 501 and other components in the battery, resulting in a short circuit in the battery.

[0159] like Figure 5 As shown, the insulating ring 200 provided in the embodiment of the present application has a guide portion 203 , at least part of which 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 .

[0160] It is understandable that the setting of the guide portion 203 can guide the connection between the battery tab 501 and the cover plate 300 to isolate the connection between the tab 501 and the battery shell 500, thereby reducing the occurrence of battery short circuit.

[0161] 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 configured to be tapered, that is, the insulating ring 200 is smaller on the side closer to the battery core 502.

[0162] It can be understood that at least part of the insulating ring 200 is configured to be tapered, which can extend the setting length of the insulating ring 200 to isolate the connection between the tab 501 and the shell, thereby providing insulation protection for the battery and extending the service life of the battery; and can reduce the space occupied by the insulating ring 200 to reduce the processing cost of the insulating ring 200, and can reduce the overall weight of the battery cover assembly, thereby achieving lightweight batteries.

[0163] The insulating ring 200 provided in an embodiment of the present application includes: a first ring body 204 and a second ring body 205, the first ring body 204 is connected to the second ring body 205; the inner circle of the first ring body 204 and the inner circle of the second ring body 205 enclose a ring cavity 202; the second ring body 205 is located on the side of the first ring body 204 away from the battery pole core 502, and along the direction from the vertical cover plate 300 to the battery pole core 502, at least part of the second ring body 205 protrudes from the first ring body 204.

[0164] It can be understood that the setting of the first ring body 204 and the second ring body 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, so as to improve the processing efficiency of the battery cover assembly; and can isolate the direct contact between the cover 300 and the connecting ring 100 to insulate and protect the battery, thereby extending the service life of the battery.

[0165] It should be noted that the first ring body 204 has multiple different functions. The functions of the first ring body 204 are described below with examples.

[0166] In a feasible embodiment, at least a portion of a side of the first ring body 204 close to the battery pole core 502 forms an extension portion 201 .

[0167] It is understandable that at least a portion of the first ring body 204 forms the extension portion 201 , which has the advantage of simple processing, and the extension portion 201 can avoid direct contact between the tab 501 and the battery housing 500 , thereby extending the service life of the battery.

[0168] In a feasible embodiment, at least a portion of a side of the first ring body 204 close to the battery pole core 502 forms a guide portion 203 .

[0169] It is understood that at least a portion of the first ring body 204 forms the guide portion 203, which has the advantage of simple processing. The guide portion 203 can avoid direct contact between the tab 501 and the battery housing 500, thereby extending the service life of the battery. It can also guide the installation of the tab 501, thereby reducing the difficulty of connecting the tab 501 and the cover plate 300. Taking a cylindrical battery as an example: the provision of the guide portion 203 can reduce the space occupied by the first ring body 204 and has the advantage of convenient processing. It can also reduce the weight of the insulating ring 200, thereby reducing the overall weight of the cover plate assembly and the battery, thereby achieving a lightweight battery configuration and improving battery processing efficiency.

[0170] It is understandable that the specific function of the first ring body 204 is not limited and can be selected according to actual usage requirements.

[0171] like Figure 6 As shown, the cover plate 300 provided in the embodiment of the present application includes a first portion 301 and a second portion 302 , and the second portion 302 is connected to the circumference of the first portion 301 .

[0172] It should be noted that the second part 302 is connected to the circumferential side of the first part 301 to increase the area of the cover plate 300, so as to increase the area of the connection between the cover plate 300 and the insulating ring 200, thereby increasing the connection strength between the cover plate 300 and the insulating ring 200, so as to increase the connection strength of the cover plate assembly and reduce the occurrence of the cover plate 300 falling off from the insulating ring 200, thereby extending the service life of the battery.

[0173] It should be noted that the inner wall of the second part 302 is connected to the outer wall of the first part 301, and there are many different connection methods between the inner wall of the second part 302 and the outer wall of the first part 301. The connection methods between the inner wall of the second part 302 and the outer wall of the first part 301 are explained below with examples.

[0174] In a feasible embodiment, the inner side wall of the second part 302 is welded and fixed to the outer peripheral wall of the first part 301. It can be understood that the welding and fixing between 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.

[0175] In another feasible embodiment, the second part 302 and the first part 301 are processed by an integrated molding process, and along the depth direction of the cover plate 300, the first part 301 is located on the inner side of the second part 302; the second part 302 and the first part 301 are integrated into the molding process, which has the advantage of high connection strength.

[0176] It is understandable that there is no restriction on the specific connection method between the inner wall of the second part 302 and the outer wall of the first part 301, and it can be selected according to actual use requirements. It is only necessary to ensure that the inner wall of the second part 302 and the outer wall of the first part 301 are fixedly connected.

[0177] It should be noted that the first portion 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 tab 501 of the battery; so that the pole core 502, the tab 501 and the cover plate 300 can be electrically connected.

[0178] The embodiments of the present 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 are described below with examples.

[0179] like Figure 7 and Figure 8 As shown, in a feasible embodiment, the first part 301 is located in the inner ring of the insulating ring 200, the second part 302 protrudes from the insulating ring 200, and 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 shell 500, that is, the second part 302 is connected to the second ring body 205, and the insulating ring 200 is used to limit the movement of the second part 302 toward the side close to the battery shell 500 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, so as to improve the service life of the battery cover plate assembly.

[0180] It should be noted that the portion of the second part 302 protruding from the insulating ring 200 is used to facilitate the operator to install it with other external components. The portion of the second part 302 protruding from the insulating ring 200 can serve to remind the operator that this portion is the preset installation position, thereby guiding the operator's installation position to reduce the difficulty of installing the battery cover assembly with other external components, thereby improving the installation efficiency of the battery pack.

[0181] like Figure 9 and Figure 10 As shown, in another feasible embodiment, the first part 301 is located in the inner ring of the insulating ring 200, the first part 301 protrudes from the insulating ring 200, and the connection between the second part 302 and the insulating ring 200 is located between the insulating ring 200 and the battery shell 500, that is, the second part 302 is connected to the first ring body 204, and the insulating ring 200 is used to limit the movement of the second part 302 toward the side away from the battery shell 500 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, so as to improve the service life of the battery cover plate assembly.

[0182] It should be noted that the portion of the first part 301 protruding from the insulating ring 200 is used to facilitate the operator's installation with other external components. The portion of the first part 301 protruding from the insulating ring 200 can serve to remind the operator that this portion is the preset installation position, thereby guiding the operator's installation position to reduce the difficulty of installing the battery cover assembly with other external components, thereby improving the installation efficiency of the battery pack.

[0183] 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 on both side 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.

[0184] It should be noted that the provision of the two second parts 302 can increase the connection strength between the cover 300 and the insulating ring 200, and can serve to remind the operator that this part is the preset installation position, thereby guiding the operator's installation position to reduce the difficulty of installing the battery cover assembly and other external components, thereby improving the installation efficiency of the battery pack.

[0185] It is understandable that there is no limitation on the specific installation method between the cover plate 300 and the insulating ring 200, and it can be selected according to actual use requirements.

[0186] 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 many 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 are illustrated below in turn.

[0187] In a feasible implementation manner, the first ring body 204 is connected to the second portion 302 .

[0188] It should be noted that the connection between the first ring body 204 and the second portion 302 can reduce the difficulty of positioning between the insulating ring 200 and the cover plate 300, thereby improving the processing efficiency of the cover plate assembly.

[0189] In another possible implementation, the second ring body 205 and the second portion 302 are connected.

[0190] It should be noted that the connection between the second ring body 205 and the second portion 302 has the advantage of simple processing.

[0191] In addition, in another feasible embodiment, the first portion 301 is connected to the first ring body 204 and the second ring body 205 respectively.

[0192] It should be noted that the first portion 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 .

[0193] It can be understood 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 restricted and can be selected according to actual usage requirements. It is only necessary to ensure the connection between the insulating ring 200 and the cover plate 300.

[0194] 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, which is not limited in this embodiment.

[0195] like Figure 11 As shown, the connecting ring 100 provided in the embodiment of the present application has an inner surface 101 and an outer surface 102 , and the inner surface 101 and the outer surface 102 are connected.

[0196] It can be understood that the setting 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 to improve the connection strength between the connecting ring 100 and the insulating ring 200, and can reduce the connection difficulty between the connecting ring 100 and the insulating ring 200 to improve the installation efficiency of the battery cover assembly.

[0197] It should be noted that there are a variety of different connection positions between the connecting ring 100 and the insulating ring 200. The connection positions between the connecting ring 100 and the insulating ring 200 are described below with examples.

[0198] In a feasible embodiment, the inner surface 101 is connected to the circumference of the first ring body 204 , and the inner surface 101 is sleeved on the circumference of the first ring body 204 , which has the advantage of easy installation.

[0199] In another feasible embodiment, the outer surface 102 is connected to the second ring body 205, and the inner surface 101 is spaced apart from the circumference of the first ring body 204, which has the advantage of low processing difficulty.

[0200] 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 circumferential side of the first ring body 204, which has the advantage of high connection strength.

[0201] It is understandable that there is no limitation on the specific connection method between the connecting ring 100 and the insulating ring 200, and it can be selected according to actual use requirements.

[0202] It should be noted that the outer surface 102 is connected to the battery housing 500 .

[0203] It can be understood that the battery shell 500 is located on the side of the outer surface 102 away from the insulating ring 200, and the outer surface 102 is connected to the battery shell 500, which can reduce the difficulty of connecting between the connecting ring 100 and the battery shell 500, thereby improving the processing efficiency between the battery cover assembly and the battery shell 500.

[0204] 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 shell 500.

[0205] It can be understood 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 shell 500, which can reduce the space occupied between the cover plate 300 and the battery shell 500, thereby reducing the volume of the battery; and can reduce the difficulty of connecting the cover plate 300 and the battery shell 500, thereby improving the processing efficiency of the battery.

[0206] It should be noted 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 protrudes from the insulating ring 200 , and the cover plate 300 is connected to the guide portion 206 .

[0207] It can be understood that the setting of the guide portion 206 can support the installation of the cover plate 300 and play a role in guiding the installation position of the cover plate 300, thereby improving the installation efficiency of the battery cover plate assembly.

[0208] It should be noted that at least part of the second ring body 205 forms a guide portion 206, and the guide portion 206 protrudes from the second ring body 205 along the direction from the pole core 502 to the cover plate 300. The setting of 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.

[0209] like Figure 12 As shown, the cover plate 300 provided in the embodiment of the present 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, and the first maximum length L1 and the second maximum length L2 satisfy: 1>L2 / L1≥0.8.

[0210] It is understood that the relationship between the first maximum length L1 and the second maximum length L2 satisfies: 1>L2 / L1≥0.8. This arrangement increases the connection area between the cover assembly and the tab 501, thereby increasing the flow area of the cover assembly and enlarging the current-carrying surface of the cover assembly, thereby improving battery performance. It also reduces battery heat generation, thereby increasing the battery's service life and safety.

[0211] It should be noted that there are many different ways to set the first length L1. The following describes the ways to set the first length L1 with examples.

[0212] In one feasible embodiment, the first length L1 is: the surface of the cover plate 300 that is coplanar or parallel to the plane where the cover plate 300 and the tab 501 are connected. It is understood that when the cover plate 300 is square, the first length L1 is the extended length of the surface of the cover plate 300 that is parallel to the plane where the cover plate 300 and the tab 501 are connected; when the cover plate 300 is circular, the first length L1 is the extended length of the surface of the cover plate 300 that is coplanar with the plane where the cover plate 300 and the tab 501 are connected.

[0213] In another feasible embodiment, the first length L1 is the longest length of the outermost circle of the cover plate 300, as measured by the orthographic projection of the surface on which the outer top wall of the cover plate 300 is located. It is understood that if the cover plate 300 is square, the first length L1 is the length of the straight line along the diagonal of the square; if the cover plate 300 is circular, the first length L1 is the length of the straight line along the diameter of the circle.

[0214] It is understandable that there is no limitation on the setting of the first length L1, and it can be selected according to actual usage requirements.

[0215] It should be noted that there are many different arrangements between the pole core 502 and the pole tab 501 . The arrangements between the pole core 502 and the pole tab 501 are described below in turn with examples.

[0216] In a feasible embodiment, the pole core 502 has a pole ear 501, and the pole ear 501 is connected to the pole core 502 along a preset installation direction; wherein the second maximum length L2 is: the connection length between the pole ear 501 and the pole core 502 along the preset installation direction.

[0217] In another feasible embodiment, the pole core 502 has multiple pole lugs 501, and the multiple pole lugs 501 are arranged at intervals on the pole core 502 along the preset installation direction; wherein the second maximum length L2 is: the distance between the first pole lug 501 and the last pole lug 501 in the preset installation direction.

[0218] It can be understood that there is no restriction on the arrangement between the pole core 502 and the pole tab 501, and it can be selected according to actual use requirements; when there is no restriction on the arrangement between the pole core 502 and the pole tab 501, there is no restriction on the setting method of the second maximum length L2, and it can be selected according to actual use requirements.

[0219] It should be noted that there are various ratios between the first maximum length L1 and the second maximum length L2. The ratios of the first maximum length L1 and the second maximum length L2 are described below with examples.

[0220] In a feasible embodiment, the ratio L2 / L1 of the first maximum length L1 and the second maximum length L2 is 0.9, that is, the length of one end of the pole tab 501 connected to the pole core 502 is less than the length of the cover plate 300. Through this setting, the insulating ring 200 on the cover plate 300 can be avoided to reduce the difficulty of connection between the cover plate 300 and the pole tab 501, and the processing cost of the pole tab 501 can be reduced.

[0221] In another feasible implementation manner, the ratio L2 / L1 of the first maximum length L1 and the second maximum length L2 is 0.8, that is, the length of one end of the pole tab 501 connected to the pole core 502 is less than the length of the cover plate 300. Through this setting, the insulating ring 200 on the cover plate 300 can be avoided to reduce the difficulty of connecting between the cover plate 300 and the pole tab 501, and the processing cost of the pole tab 501 can be reduced.

[0222] It is understandable that the specific setting method of the ratio L2 / L1 of the first maximum length L1 and the second maximum length L2 is not limited and can be selected according to actual use requirements, as long as 1>L2 / L1≥0.8 is ensured.

[0223] It should be noted that if L2 / L1 is equal to 1, the insulating ring 200 on the cover plate 300 will be connected to the pole lug 501. Since the insulating ring 200 is an insulating material or a weakly conductive material, the connection between the insulating ring 200 and the pole lug 501 will be difficult to process and the pole lug 501 will be wasted. If L2 / L1 is less than 0.8, the connection area between the pole lug 501 and the cover plate 300 will become smaller, thereby reducing the current-carrying surface of the cover plate 300 and reducing the flow area of the cover plate 300, thereby causing a larger temperature rise of the cover plate 300, and shortening the service life of the battery and worsening its safety. By ensuring that the relationship between the first maximum length L1 and the second maximum length L2 is satisfied: 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 flow area of the cover plate 300 and making the current-carrying surface of the cover plate 300 larger, thereby improving the performance of the battery; and the difficulty of connecting the tab 501 and the cover plate 300 can be reduced, which has the advantage of convenient processing.

[0224] The battery core 502 provided in the embodiment of the present application has a third maximum length L3, and the third maximum length L3 and the second maximum length L2 satisfy the following: 1≥L2 / L3≥0.8.

[0225] It can be understood that by making the third maximum length L3 and the second maximum length L2 satisfy: 1≥L2 / L3≥0.8; the connection area of the connection between the pole tab 501 and the pole core 502 body can be increased, and the current-carrying surface between the pole tab 501 and the pole core 502 body can be enlarged, thereby improving the performance of the battery; while increasing the connection area of the connection between the pole tab 501 and the pole core 502 body, the connection area between the side of the pole tab 501 away from the pole core 502 body and the cover assembly can be increased, thereby improving the performance of the battery.

[0226] 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 must 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.

[0227] It should be noted that the third maximum length L3 and the second maximum length L2 provided in the embodiments of the present application have a variety of different ratios. The ratios of the third maximum length L3 and the second maximum length L2 are illustrated below in turn.

[0228] In a feasible embodiment, the ratio L2 / L3 of the third maximum length L3 and the second maximum length L2 is 1, that is, the end of the pole tab 501 connected to the pole core 502 is laid on the pole core 502. At this time, the connection surface area of the pole tab 501 and the pole core 502 is large, and the area of the current-carrying surface between the pole tab 501 and the pole core 502 is large, thereby improving the performance of the battery.

[0229] In another feasible embodiment, the ratio L2 / L3 of the third maximum length L3 and the second maximum length L2 is 0.8, that is, the end of the pole tab 501 connected to the pole core 502 is laid on the pole core 502. At this time, the connection surface area of the pole tab 501 and the pole core 502 is large, and the area of the current-carrying surface between the pole tab 501 and the pole core 502 is large, thereby improving the performance of the battery.

[0230] 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. It only needs to ensure that the ratio between the third maximum length L3 and the second maximum length L2 satisfies: 1≥L2 / L3≥0.8.

[0231] It should be noted that if L2 / L3 is less than 0.8, the connection area between the tab 501 and the core 502 will be reduced, thereby reducing the current-carrying surface of the tab 501 and the flow area between the tab 501 and the core 502. This will lead to a large temperature rise in the tab 501 and the core 502, shortening the battery life and reducing the safety of use. By ensuring that the third maximum length L3 and the second maximum length L2 satisfy the following relationship: 1 ≥ L2 / L3 ≥ 0.8, the connection area between the tab 501 and the core 502 can be increased, and the current-carrying surface between the tab 501 and the core 502 can be increased, thereby improving the battery's performance. Increasing the connection area between the tab 501 and the core 502 can also increase the connection area between the tab 501 and the core 502 and the cover plate 300, thereby improving the battery's performance.

[0232] The first maximum length L1 and the second maximum length L2 provided in the embodiment of the present application satisfy the following: 0 mm < L1 - L2 ≤ 6 mm.

[0233] It should be noted that there are various differences between the first maximum length L1 and the second maximum length L2. The differences between the first maximum length L1 and the second maximum length L2 are described below with examples.

[0234] In a feasible embodiment, the difference L1-L2 between the first maximum length L1 and the second maximum length L2 is 6 mm, that is, the length of the end where the pole tab 501 is connected to the pole core 502 is 6 mm less than the length of the cover plate 300. Through this setting, the insulating ring 200 on the cover plate 300 can be avoided to reduce the difficulty of connecting the cover plate 300 and the pole tab 501, and the processing cost of the pole tab 501 can be reduced.

[0235] In another feasible embodiment, the difference L1-L2 between the first maximum length L1 and the second maximum length L2 is 1 mm, that is, the length of the end where the pole tab 501 is connected to the pole core 502 is 1 mm smaller than the length of the cover plate 300. Through this setting, the insulating ring 200 on the cover plate 300 can be avoided to reduce the difficulty of connection between the cover plate 300 and the pole tab 501, and the processing cost of the pole tab 501 can be reduced.

[0236] It is understandable that the specific numerical 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. It only needs to ensure that the first maximum length L1 and the second maximum length L2 satisfy: 0mm<L1-L2≤6mm.

[0237] It should be noted that if the difference between L1 and L2 is equal to 0, the insulating ring 200 on the cover plate 300 will be connected to the pole lug 501. Since the insulating ring 200 is an insulating material or a weakly conductive material, the connection between the insulating ring 200 and the pole lug 501 will be difficult to process and the pole lug 501 will be wasted. If the difference between L1 and L2 is greater than 6 mm, the connection area between the pole lug 501 and the cover plate 300 will become smaller, thereby reducing the current-carrying surface of the cover plate 300 and reducing the flow area of the cover plate 300, thereby causing a larger temperature rise of the cover plate 300, and shortening the service life of the battery and worsening its safety.

[0238] It is understood that the first maximum length L1 and the second maximum length L2 satisfy the following relationship: 0mm<L1-L2≤6mm. This battery structure increases the flow area of the cover plate 300 by increasing the connection area between the tab 501 and the cover plate 300, thereby increasing the current-carrying surface of the cover plate 300 and improving battery performance. It also reduces the difficulty of connecting the tab 501 to the cover plate 300, offering the advantage of convenient manufacturing.

[0239] The second maximum length L2 and the third maximum length L3 provided in the embodiment of the present application satisfy the following relationship: 0mm≤L3-L2≤4mm.

[0240] It should be noted that there are various differences between the second maximum length L2 and the third maximum length L3. The differences between the second maximum length L2 and the third maximum length L3 are described below with examples.

[0241] In a feasible embodiment, 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 pole core 502 is 4 mm longer than the length of the connection between the pole core 502 and the pole tab 501. At this time, the connection surface area of the pole tab 501 and the pole core 502 is large, and the area of the current-carrying surface between the pole tab 501 and the pole core 502 is large, thereby improving the performance of the battery.

[0242] In another feasible embodiment, 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 pole core 502 is the same as the length of the connection between the pole core 502 and the pole tab 501. At this time, the connection surface area of the pole tab 501 and the pole core 502 is large, and the area of the current-carrying surface between the pole tab 501 and the pole core 502 is large, thereby improving the performance of the battery.

[0243] It can be understood 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. It is only necessary to ensure that the second maximum length L2 and the third maximum length L3 satisfy: 0mm≤L3-L2≤4mm.

[0244] It should be noted that if the difference between L3 and L2 is greater than 4 mm, the connection area between the tab 501 and the core 502 will become smaller, thereby reducing the current-carrying surface of the tab 501 and the flow area between the tab 501 and the core 502, resulting in a larger temperature rise of the tab 501 and the core 502, and reducing the service life of the battery and worsening the safety of use.

[0245] It is understood that the second maximum length L2 and the third maximum length L3 satisfy the following relationship: 0mm≤L3-L2≤4mm. A battery with this structure can increase the connection area between the tab 501 and the core 502 by reducing the exposed area of the core 502 and the tab 501, thereby increasing the current-carrying surface between the tab 501 and the core 502, thereby improving battery performance. By increasing the connection area between the tab 501 and the core 502, the connection area between the tab 501 facing away from the core 502 and the cover plate 300 can be increased, thereby improving battery performance.

[0246] The battery core 502 provided in the embodiment of the present application has a connection surface connected to the battery tab 501, and the outer wall of the tab 501 and the connection surface are arranged at an angle θ; the angle θ satisfies: 95°≥θ≥80°

[0247] It should be noted that the angle θ can be set in a variety of different degrees. The degrees of the angle θ are described below with examples.

[0248] In a feasible embodiment, the angle θ is 80 degrees, that is, the connecting surface and the outer wall of the pole ear 501 are set at an angle of 80 degrees. This setting can reduce the bending of the pole ear 501, thereby reducing the occurrence of battery short circuit caused by contact between the pole ear 501 and the pole core 502, thereby improving the safety of the battery and extending the service life of the battery.

[0249] In another feasible embodiment, the 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 circuit caused by contact between the tab 501 and the pole core 502, thereby improving the safety of the battery and extending the service life of the battery.

[0250] It is understandable that there is no limit to the degree of the angle θ, and it can be selected according to actual use requirements, as long as the angle θ satisfies: 95°≥θ≥80°.

[0251] It can be understood that by setting an angle between the connecting surface and the outer wall of the tab 501, the bending of the tab 501 can be reduced to improve the safety of the battery; and the contact between the tab 501 and the core 502 can be avoided to cause a short circuit in the battery, thereby extending the service life of the battery.

[0252] The pole core 502 provided in the embodiment of the present application has a connection surface connected to the pole tab 501, and the outer wall of the pole tab 501 and the connection surface are arranged at an angle θ; the angle θ satisfies: 95°≥θ≥90°

[0253] It should be noted that the angle θ can be set in a variety of different degrees. The degrees of the angle θ are described below with examples.

[0254] In a feasible embodiment, the 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 circuit caused by contact between the tab 501 and the pole core 502, thereby improving the safety of the battery and extending the service life of the battery.

[0255] In another feasible embodiment, the 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 battery short circuit caused by contact between the tab 501 and the pole core 502, thereby improving the safety of the battery and extending the service life of the battery.

[0256] In addition, in another feasible embodiment, the 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 circuit caused by contact between the tab 501 and the pole core 502, thereby improving the safety of the battery and extending the service life of the battery.

[0257] It is understandable that there is no limit to the degree of the angle θ, and it can be selected according to actual use requirements, as long as the angle θ satisfies: 95°≥θ≥90°.

[0258] It can be understood that by setting an angle between the connecting surface and the outer wall of the tab 501, the bending of the tab 501 can be reduced to improve the safety of the battery; and the contact between the tab 501 and the core 502 can be avoided to cause a short circuit in the battery, thereby extending the service life of the battery.

[0259] like Figure 13 and Figure 14 As shown, it should be noted that, in the battery cover assembly provided in the embodiment of the present application, the cover 300 located in the inner circle of the insulating ring 200 has an orthographic projection area S1 on the surface where the outer top wall of the insulating ring 200 is located; the outer circle of the insulating ring 200 has an orthographic projection area S2 on the surface where the outer top wall of the insulating ring 200 is located; and the relationship between S1 and S2 is: 1 / 10≤S1 / S2≤1 / 2.

[0260] It is understood that the orthographic projection area of the cover plate 300 located within the inner ring of the insulating ring 200 onto the surface of the outer top wall of the insulating ring 200 is S1; the orthographic projection area of the outer ring of the insulating ring 200 onto the surface of the outer top wall of the insulating ring 200 is S2, and the relationship between S1 and S2 satisfies: 1 / 10 ≤ S1 / S2 ≤ 1 / 2. This arrangement increases the area of the cover plate 300, thereby increasing the flow area of the cover plate 300, thereby enlarging the current-carrying surface of the cover plate 300, thereby increasing the current-carrying capacity of the cover plate 300 and improving the performance of the battery cover plate assembly. The increased current-carrying surface of the cover plate 300 can reduce the temperature of the battery, thereby extending the battery life and improving the safety of battery use.

[0261] 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, which may cause the cover plate 300 to fall off the insulating ring 200; if S1 / S2 is greater than 1 / 2, since the cover plate 300 is a metal part, increasing the volume of the cover plate 300 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 lightweighting of the battery and will result in 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 flow area of the cover plate 300, thereby increasing the current-carrying surface of the cover plate 300, thereby improving the current-carrying capacity of the cover plate 300, and thus improving the performance of the battery cover plate assembly; and the overall weight of the cover plate 300 can be reduced, thereby reducing the weight of the battery, so that the battery can be lightweight.

[0262] 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.

[0263] It can be understood that the cover plate 300 located in the inner circle of the insulating ring 200 is connected to the pole core 502 of the battery through the pole ear 501. Increasing the area of the cover plate 300 located in the inner circle of the insulating ring 200 can increase the flow area of the cover plate 300, thereby making the current-carrying surface of the cover plate 300 larger, so as to improve the current-carrying capacity of the cover plate 300, thereby improving the performance of the battery cover plate assembly.

[0264] 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 since the size of the cover plate 300 is small, it will cause the temperature rise of the battery to be large, thereby reducing the service life of the battery and resulting in poor battery safety.

[0265] like Figure 15 As shown, it should be noted that in the cover plate assembly provided in the embodiment of the present application, the cover plate 300 has a minimum cross-sectional end surface along the direction from the vertical cover plate 300 to the pole core 502 of the battery, and the current-carrying area S3 of the minimum cross-sectional end surface of the cover plate 300 satisfies; S3 ≥ I / N; wherein I is the continuous current that the battery needs to meet, in A; N is the current-carrying coefficient of the cover plate 300, in A / mm 2 .

[0266] It can be understood that by making S3 satisfy; S3 ≥ I / N, the area of the cover plate 300 can be increased, thereby increasing the flow area of the cover plate 300, thereby making the current-carrying surface of the cover plate 300 larger, so as to improve the current-carrying capacity of the cover plate 300, thereby improving the performance of the battery cover plate assembly; and the size of the minimum cross-sectional end face of the cover plate 300 can be selected according to the continuous current that the battery needs to meet and the current-carrying coefficient of the different materials of the cover plate 300, which can avoid wasting the conductive material for making the cover plate 300 body, thereby reducing the production cost of the cover plate 300, and can reduce the overall weight of the cover plate assembly, thereby reducing the weight of the battery, so that the battery can be lightweight.

[0267] 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 continues to flow in the working state.

[0268] It should be noted that the current carrying coefficient of the cover plate 300 refers to the maximum current that the cover plate 300 can carry per unit area. When designing a battery, the maximum current is determined by the corresponding battery. Different batteries will import a corresponding maximum current when designed. 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, and is determined during the battery design and testing process.

[0269] For example, if a 50A battery meets the 4C requirement, the maximum overcurrent value of the battery is I = 200A, where C refers to the charge and discharge rate of the battery.

[0270] It should be noted that the orthographic projection area S3 of the minimum cross-sectional end surface of the cover plate 300 on the surface where the outer top wall of the insulating ring 200 is located has many different values. The following examples illustrate the values of the orthographic projection area S3 of the minimum cross-sectional end surface of the cover plate 300 on the surface where the outer top wall of the insulating ring 200 is located.

[0271] In a feasible embodiment, the cover plate 300 is made of copper, and the current carrying coefficient N1 of the copper cover plate 300 is between 5-8A / mm 2 For example, the current carrying coefficient N1 of the copper cover 300 may be 5A / mm 2 , 6A / mm 2 , 7A / mm 2 , 8A / mm 2 Or between 5-8A / mm 2 Any value in between.

[0272] In the embodiment of the present application, the current carrying coefficient N1 is mainly taken as 5 for illustration. For example, a 50A battery meets the 4C requirement, then the maximum current value of the battery is I1 = 200A, and the current carrying area S1 of the copper cover 300 is ≥ 200 / 5 = 40mm 2 .

[0273] In another feasible embodiment, the cover plate 300 is made of aluminum, and the current carrying coefficient N2 of the aluminum cover plate 300 is between 3-5A / mm 2 For example, the current carrying coefficient N2 of the aluminum cover 300 may be 3A / mm 2 , 3.5A / mm 2 , 4A / mm 2 , 5A / mm 2 Or between 3-5A / mm 2 Any value in between.

[0274] In the embodiment of this application, the current carrying coefficient N2 is mainly taken as 3 for illustration. For example, a 50A battery meets the 4C requirement, then the maximum current value of the battery is I2 = 200A, and the current carrying area S2 of the aluminum cover 300 is ≥ 200 / 3 = 67mm 2 .

[0275] In addition, in another feasible embodiment, the cover plate 300 may be a metal composite part.

[0276] It should be noted that metal cladding refers to the fact that the cover plate 300 is made of a composite of different metals. In this embodiment, the specific composite material of the cover plate 300 is not limited. For example, the cover plate 300 can be made of a copper-aluminum composite or a steel-aluminum composite, and this is not a limitation in this embodiment. Any material that is conductive and connects the cover plate 300 to the battery tab 501 falls within the scope of protection of this application.

[0277] In one practicable embodiment, the cover plate 300 is made of a copper-aluminum composite member, and the current carrying coefficient N3 of the copper-aluminum composite cover plate 300 is between 4-7 A / mm 2 For example, the current carrying coefficient N3 of the copper-aluminum composite cover plate 300 may be 4A / mm 2 , 5A / mm 2 , 6A / mm 2 , 7A / mm 2 or between 4-7A / mm 2 Any value in between.

[0278] In the embodiment of the present application, the current carrying coefficient N3 is mainly 4. For example, a 50A battery meets the 4C requirement, then the maximum current value of the battery is I3 = 200A, and the current carrying area S3 of the copper-aluminum composite cover 300 is ≥ 200 / 4 = 50mm 2 .

[0279] It is understandable that the value of the current-carrying area S3 of the minimum cross-sectional end surface of the cover plate 300 is not limited and can be selected according to actual use requirements.

[0280] like Figure 16 As shown, the cover plate 300 provided in the embodiment of the present application is provided with a buffer groove 303 , and the buffer groove 303 is located on at least one side of the cover plate 300 close to the battery housing 500 or away from the battery housing 500 .

[0281] It can be understood that the buffer groove 303 on the cover plate 300 can accommodate the deformation of the insulating ring 200 when it is squeezed toward one side of the cover plate 300 under high and low temperature impact, and release the stress on the insulating ring 200 to reduce the occurrence of cracking of the insulating ring 200, thereby improving the yield rate of the battery and increasing the service life of the battery.

[0282] It should be noted that the buffer slot 303 has a variety of different opening positions. The opening positions of the buffer slot 303 are described below with examples.

[0283] In a feasible embodiment, the buffer groove 303 is opened on the side of the cover plate 300 close to the battery shell 500. The buffer groove 303 is used to accommodate the deformation caused by the insulating ring 200 squeezing the cover plate 300 toward the side close to the battery shell 500, so as to reduce the occurrence of cracking of the insulating ring 200, thereby improving the yield rate of the battery and increasing the service life of the battery.

[0284] In another feasible embodiment, the buffer groove 303 is opened on the side of the cover plate 300 away from the battery shell 500. The buffer groove 303 is used to accommodate the deformation caused by the insulating ring 200 squeezing the cover plate 300 toward the side away from the battery shell 500, so as to reduce the occurrence of cracking of the insulating ring 200, thereby improving the yield rate of the battery and increasing the service life of the battery.

[0285] In addition, in another feasible embodiment, two buffer grooves 303 are provided, one of which is located on the side of the cover plate 300 close to the battery housing 500. The buffer groove 303 is used to accommodate the deformation caused by the insulating ring 200 squeezing the cover plate 300 toward the side close to the battery housing 500; the other buffer groove 303 is located 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 squeezing the cover plate 300 toward the side away from the battery housing 500. Therefore, the provision of the buffer groove 303 can reduce the occurrence of cracking of the insulating ring 200, thereby improving the yield rate of the battery and increasing the service life of the battery.

[0286] It is understandable that the location of the buffer groove 303 is not restricted and can be selected according to actual use requirements. It only needs to ensure that the buffer groove 303 can accommodate the deformation caused by the insulating ring 200 squeezing the cover plate 300 toward one side of the cover plate 300.

[0287] An embodiment of the present application provides a battery, including a battery housing 500 and the battery cover assembly provided in the above embodiment, wherein the battery cover assembly is disposed on the battery housing 500 .

[0288] It should be noted that the cover plate 300 has various shapes, and the shapes of the cover plate 300 are described below with examples.

[0289] like Figure 17 and Figure 18 As shown, in a 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 arranged on the cylindrical battery.

[0290] 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.

[0291] like Figure 19 and Figure 20 As shown, 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.

[0292] It should be noted that the connection between the square cover 300 and the square battery has the advantage of occupying a small space. In the case of connecting multiple batteries, the connection of multiple adjacent square batteries has the advantage of a compact structure.

[0293] It is understandable that there is no restriction on the shape of the cover 300 , and it can be selected according to actual usage requirements. It only needs to ensure that the cover 300 and the battery are matched and that the cover 300 can be installed on the battery housing 500 .

[0294] It should be noted that the multiple positive electrode sheets in the electrode core 502 are electrically connected to a cover plate 300 through the electrode tab 501, and the cover plate 300 connected to the positive electrode sheet forms the positive electrode cover plate 300; the multiple negative electrode sheets are electrically connected to another cover plate 300 through the electrode tab 501, and the cover plate 300 connected to the negative electrode sheet forms the negative electrode cover plate 300.

[0295] In the battery provided in the embodiment of the present application, the cover plate 300 has a variety of different functions. The functions of the cover plate 300 are described below in turn with examples.

[0296] In a feasible embodiment, the cover plate 300 forms the positive electrode cover plate 300 of the battery, and the positive electrode cover plate 300 is set on the battery shell 500 through the insulating ring 200 and the connecting ring 100; the positive electrode cover plate 300 can enlarge the current-carrying surface of the positive electrode of the battery to improve the current-carrying capacity of the battery, thereby improving the battery's performance.

[0297] In another feasible embodiment, the cover plate 300 forms the negative electrode cover plate 300 of the battery, and the negative electrode cover plate 300 is set on the battery housing 500 through the insulating ring 200 and the connecting ring 100; the negative electrode cover plate 300 can enlarge the current-carrying surface of the negative electrode of the battery to improve the current-carrying capacity of the battery, thereby improving the battery's performance.

[0298] like Figure 21 and Figure 22 As shown, in addition, in another feasible embodiment, two cover plates 300 are provided, one of which forms the positive electrode cover plate 300 of the battery, and the positive electrode cover plate 300 is provided on the battery housing 500 through 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 the negative electrode cover plate 300 is provided on the battery housing 500 through another insulating ring 200 and another connecting ring 100, and the other connecting ring 100 is used to connect the negative electrode cover plate 300 and the battery housing 500. The positive electrode cover plate 300 can enlarge 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; the negative electrode cover plate 300 can enlarge 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.

[0299] It is understandable that the specific function of the cover 300 is not limited and can be selected according to actual usage requirements.

[0300] It should be noted that the battery positive electrode and negative electrode provided in the embodiments of the present application have a variety of different configurations. The configurations of the battery positive electrode and negative electrode are described below with examples.

[0301] In a feasible embodiment, in a battery, the positive electrode and the negative electrode of the battery are arranged opposite to each other, that is, the positive electrode and the negative electrode of the battery are located on two opposite surfaces of the battery. The opposite arrangement of the positive electrode and the negative electrode of the battery has the advantage of high safety.

[0302] In another possible embodiment, in a battery, the positive and negative electrodes are disposed on the same surface of the battery. Disposing the positive and negative electrodes on the same surface has the advantage of minimizing the contact space between the battery and the outside world, and also provides space-saving and compact structure when multiple batteries are connected.

[0303] It is understandable that there is no restriction on the configuration of the positive and negative electrodes of the battery, and they can be selected according to actual usage requirements.

[0304] It can be understood that the positive electrode cover 300 of the battery is arranged on the side of the battery shell 500 close to the positive electrode of the battery, and the negative electrode cover 300 of the battery is arranged on the side of the battery shell 500 close to the negative electrode of the battery. In this way, a continuous potential difference path can be formed between the positive and negative electrodes of the battery to improve the battery performance.

[0305] The battery provided in the embodiment of the present application further includes an explosion-proof valve 600 , which is configured to automatically open and release the internal pressure when the internal pressure of the battery abnormally increases, thereby preventing the battery from exploding.

[0306] It should be noted that the explosion-proof valve 600 has a variety of different installation positions. The installation positions of the explosion-proof valve 600 are described below with examples.

[0307] In a feasible embodiment, the explosion-proof valve 600 is installed on the negative electrode cover 300, one end of the explosion-proof valve 600 is set toward the side away from the negative electrode cover 300, and the other end of the explosion-proof valve 600 extends into the interior of the battery casing 500. The explosion-proof valve 600 can prevent the battery from exploding to provide safety protection for the battery.

[0308] In another feasible embodiment, the explosion-proof valve 600 is installed on the positive electrode cover 300, one end of the explosion-proof valve 600 is set toward the side away from the positive electrode cover 300, and the other end of the explosion-proof valve 600 extends into the interior of the battery casing 500. The explosion-proof valve 600 can prevent the battery from exploding to provide safety protection for the battery.

[0309] 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 set toward the side away from the pole core 502, and the other end of the explosion-proof valve 600 extends toward the side close to the pole core 502. The explosion-proof valve 600 can prevent the battery from exploding to provide safety protection for the battery.

[0310] It is understandable that the specific installation position of the explosion-proof valve 600 is not limited and can be selected according to actual usage requirements.

[0311] The battery provided in the embodiment of the present application further includes: an injection hole 700, which is used to add electrolyte toward the interior of the battery housing 500 and prevent the electrolyte inside the battery from overflowing.

[0312] It should be noted that the liquid injection hole 700 has a variety of different installation positions. The installation positions of the liquid injection hole 700 are described below with examples.

[0313] In a feasible embodiment, the injection hole 700 is installed on the negative electrode cover 300, one end of the injection hole 700 is set toward the side away from the negative electrode cover 300, and the other end of the injection hole 700 extends into the interior of the battery shell 500. The setting of the injection hole 700 can facilitate the operator to add electrolyte toward the interior of the battery shell 500, and can prevent the electrolyte inside the battery from overflowing, so as to safely protect the battery.

[0314] In another feasible embodiment, the injection hole 700 is installed on the positive electrode cover 300, one end of the injection hole 700 is set toward the side away from the positive electrode cover 300, and the other end of the injection hole 700 extends into the interior of the battery shell 500. The setting of the injection hole 700 can facilitate the operator to add electrolyte toward the interior of the battery shell 500, and can prevent the electrolyte inside the battery from overflowing, so as to safely protect the battery.

[0315] It is understandable that the specific installation position of the liquid injection hole 700 is not limited and can be selected according to actual usage requirements.

[0316] The battery provided in the embodiment of the present application further includes: an electrode, which is used to connect the internal and external circuits of the battery, and plays the role of transmitting current in the circuit and drawing out voltage.

[0317] It should be noted that the pole has a variety of different installation positions. The installation positions of the poles are described below with examples.

[0318] In a feasible embodiment, the pole is installed on the negative electrode cover 300, with one end of the pole facing away from the negative electrode cover 300, and the other end of the pole is electrically connected to the negative electrode cover 300. The setting of the pole can connect the internal and external circuits of the battery, thereby transmitting current in the circuit and drawing out voltage.

[0319] In another feasible embodiment, the electrode is installed on the positive electrode cover 300, one end of the electrode is set toward the side away from the positive electrode cover 300, and the other end of the electrode is electrically connected to the positive electrode cover 300. The setting of the electrode can connect the internal and external circuits of the battery, and play the role of transmitting current in the circuit and drawing out voltage.

[0320] It is understandable that there is no restriction on the specific installation position of the pole, and it can be selected according to actual use requirements.

[0321] An embodiment of the present application provides a battery pack, including the battery provided by the above embodiment.

[0322] It should be noted that the above embodiment provides multiple batteries, and the multiple batteries are connected to form a battery pack. The multiple batteries in a battery pack have multiple different connection methods. The connection methods between two adjacent batteries are explained below with examples.

[0323] In a feasible embodiment, two adjacent batteries are connected in parallel, that is, the positive electrode of one battery is connected to the positive electrode of the other battery through a connector, and the negative electrode of one battery is connected to the negative electrode of the other battery through another connector.

[0324] It can be understood that the parallel connection between the two batteries can ensure that the other batteries in the battery pack can be used normally when one of the batteries is damaged, which has the advantage of stable operation.

[0325] In another feasible embodiment, two adjacent batteries are connected in series, that is, the positive electrode of one battery and the negative electrode of the other battery are connected through a connector, and the negative electrode of one battery and the positive electrode of the other battery are connected through another connector.

[0326] It is understandable that connecting two batteries in series can increase the voltage of the battery pack to improve the performance of the battery pack.

[0327] It is understandable that there is no restriction on the specific connection method between multiple batteries in a battery pack, and it can be selected according to actual usage requirements.

[0328] It should be noted that the connector is a metal piece that can be conductively connected to the positive and negative electrodes of the battery.

[0329] It should be noted that the negative electrode cover plate 300 and the positive electrode cover plate 300 provided in the embodiment of the present application are made of different materials, so that the positive and negative electrodes of the battery can form a continuous potential difference path when conductively connected, so as to increase the total potential difference of the battery pack, thereby increasing the voltage of the battery and improving the performance of the battery.

[0330] It should be noted that the negative electrode cover plate 300 and the positive electrode cover plate 300 are made of a variety of different materials. The materials of the negative electrode cover plate 300 and the positive electrode cover plate 300 are described below with examples.

[0331] In a feasible implementation manner, 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 .

[0332] In another feasible embodiment, 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 .

[0333] It is understandable that the materials of the negative electrode cover plate 300 and the positive electrode cover plate 300 are not limited and can be selected according to actual use requirements.

[0334] An embodiment of the present application also provides an electrical device, including an electrical device and a battery as described in any of the above embodiments or a 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.

[0335] The electrical equipment in the embodiments of the present application may be a vehicle. For example, the vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Accordingly, the electrical device may be the vehicle's drive mechanism or the vehicle's control system.

[0336] In addition, the electrical equipment may also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships and spacecraft, etc., among which the spacecraft may include airplanes, rockets, space shuttles or spacecraft.

[0337] 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 further described in this embodiment.

[0338] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0339] It should be noted that phrases such as "one embodiment," "an embodiment," "exemplary embodiments," and "some embodiments" in this specification may indicate embodiments that may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0340] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover assembly, characterized in that: A battery housing (500) for installation on a battery, wherein the battery cover assembly comprises: A connecting ring (100) for connecting the battery housing (500); an insulating ring (200) connected to the battery housing (500) via the connecting ring (100), the insulating ring (200) having a ring cavity (202); a cover plate (300) connected to the insulating ring (200), wherein at least a portion of the cover plate (300) is connected to the tab (501) of the battery 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. A battery cover assembly according to claim 1, characterized in that: The battery housing (500) further comprises a limiting member connected to the interior of the battery housing (500), and the limiting member is connected to at least one of the connecting ring (100) and the insulating ring (200); the limiting structure (400) is formed on a side of the limiting member facing 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 portion (201), at least a portion of the extension portion (201) is located in the battery housing (500), and the extension portion (201) forms the limiting structure (400).

4. The battery cover assembly according to claim 1, characterized in that: The limiting structure (400) is an insulating member.

5. The battery cover assembly according to claim 1, characterized in that: The limiting structure (400) comprises a first limiting portion (401) and a second limiting portion (402), wherein the first limiting portion (401) and the second limiting portion (402) are arranged opposite to each other, and the first limiting portion (401) and the second limiting portion (402) enclose the opening.

6. The battery cover assembly according to claim 1, characterized in that: The limiting structure (400) is annular, and the inner ring of the annular structure forms the opening.

7. The battery cover assembly according to claim 1, characterized in that: The limiting structure (400) has a guiding surface (403), the guiding surface (403) is used to face the pole core (502) of the battery, and at least part of the pole lug (501) extends along the guiding surface (403).

8. The battery cover assembly according to claim 7, characterized in that: The guide surface (403) is arranged at an angle, and the guide surface (403) is extended from the limiting structure (400) toward a side close to the tab (501).

9. The battery cover assembly according to claim 1, characterized in that: The connecting ring (100) is a metal part.

10. A battery cover assembly according to any one of claims 1 to 9, characterized in that: The insulating ring (200) has a guide portion (203), at least part of which 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).

11. The battery cover assembly according to claim 10, characterized in that: Along the direction from the cover plate (300) to the pole core (502) of the battery, at least a portion of the insulating ring (200) is configured to be constricted.

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

13. The battery cover assembly according to claim 12, characterized in that: The cover plate (300) comprises a first portion (301) and a second portion (302), wherein the second portion (302) is connected to the circumference of the first portion (301); The first portion (301) is respectively passed 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 tab (501) of the battery; The second portion (302) is connected to at least one of the first ring body (204) and the second ring body (205).

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

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

16. A battery cover assembly according to any one of claims 1 to 9, characterized in that: The insulating ring (200) has a guide portion (206), and along the direction from the pole core (502) of the battery to the cover plate (300), at least a portion of the guide portion (206) protrudes 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 to 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, and the first maximum length L1 and the second maximum length L2 satisfy: 1>L2 / L1≥0.

8.

18. The 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: 1≥L2 / L3≥0.

8.

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

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

21. A battery cover assembly according to any one of claims 1 to 9, characterized in that: In a direction perpendicular to the cover plate (300) and extending to the pole core (502) of the battery, the cover plate (300) has a minimum cross-sectional end surface, and the current-carrying area S3 of the minimum cross-sectional end surface of the cover plate (300) satisfies: S3≥I / N; Wherein, I is the continuous current that the battery needs to meet, in A; N is the current carrying coefficient of the cover plate (300), in A / mm 2 .

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

23. A battery cover assembly according to any one of claims 1 to 9, characterized in that: The battery pole core (502) has a connection surface connected to the battery pole tab (501), and an angle θ is formed between the outer side wall of the battery pole tab (501) and the connection surface; The angle θ satisfies: 95°≥θ≥90°.

24. A battery cover assembly according to any one of claims 1 to 9, characterized in that: A buffer groove (303) is provided on the cover plate (300), and the buffer groove (303) is located on at least one side of the cover plate (300) close to the battery housing (500) 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 to 24, wherein the battery cover assembly is arranged on the battery housing (500).

26. A battery pack, characterized in that: Including the battery of claim 25.

27. An electrical device, characterized in that: It comprises an electrical device, the battery according to claim 25 or the battery pack according to claim 26, and the battery or the battery pack is used to provide electrical energy to the electrical device.

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