A battery terminal structure, a cover plate structure, a battery, a battery pack, and an electrical device

Abstract

The application relates to the technical field of batteries, and provides a battery terminal structure, a cover plate structure, a battery, a battery pack and an electric equipment. The battery terminal structure comprises a terminal platform, the terminal platform is used for being connected with a tab of a battery; a cover, the cover comprises a cover body part and a terminal part, the cover body part comprises a body part and a connecting part, the body part is formed with an accommodating space with an opening on one side, at least part of the terminal part is located in the accommodating space, and the connecting part is used for fixedly connecting with the terminal platform; and the connecting part is arranged on a circumferential edge of the terminal part. According to the embodiment of the application, the processing difficulty of the battery can be simplified, and the process cost is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery terminal structure, a cover plate structure, a battery, a battery pack, and an electrical device. Background Technology

[0002] After being welded and fixed to the electrode core, the cover plate structure of a lithium-ion battery can form a positive or negative terminal on the cover plate structure. This positive or negative terminal can be connected to an electrical device to supply power to the device.

[0003] Currently, in related technologies, the terminal platform and the cover are conventionally connected by brazing. The welding process requires brazing filler metal, and in order to ensure a tight brazing bond, the terminal platform is nickel-plated. The whole process is complicated and costly, and the nickel plating layer is prone to defects such as welding cracks, which reduces the welding yield. Utility Model Content

[0004] This application provides a battery terminal structure, a cover plate, a battery, a battery pack, and an electrical device, which can improve the safety performance and capacity of the battery.

[0005] The first aspect of this application provides a battery terminal structure, including:

[0006] A terminal platform for connecting to the battery tabs;

[0007] A cover, the cover including a cover body and a terminal part, the cover body including a main body and a connecting part, the main body forming a receiving space with an opening on one side, at least a portion of the terminal part being located within the receiving space, and the connecting part being used for fixed connection with the terminal platform;

[0008] The connecting portion is disposed on the circumferential edge of the terminal portion.

[0009] According to the battery terminal structure described in the first aspect of this application, the cover of the battery terminal structure is divided into a terminal part and a cover part. The cover part includes a body part and a connecting part. The body part forms a receiving space for accommodating the terminal part, so that the terminal part and the body part can be processed and connected together and tightly joined. Then, the connecting part provided at the circumferential edge of the terminal part is connected to the terminal platform for electrical connection with the battery tabs, which reduces the difficulty of connecting the cover and the terminal platform. The overall processing is simple, the process cost is low, and the welding yield is improved.

[0010] In one possible implementation, the cover portion and the terminal portion are an integral structure.

[0011] In one possible implementation, the cover portion is made of copper and the terminal portion is made of aluminum.

[0012] In one possible implementation, the thickness of the terminal portion is h1, where 0.3mm ≤ h1 ≤ 3mm;

[0013] The thickness of the cover portion is h2, where 0.1mm ≤ h2 ≤ 1.5mm;

[0014] The height of the terminal portion protruding from the cover portion is h3, where 0mm ≤ h3 ≤ 1mm.

[0015] In one possible implementation, the width of the connecting portion is d, where 2mm ≤ d ≤ 10mm.

[0016] In one possible implementation, the terminal platform includes:

[0017] The outer edge structure is an annular structure with through holes.

[0018] The inner structural portion is connected to the outer structural portion and extends inward to the inner side of the outer structural portion, forming a support platform, and the tab is connected to the support platform.

[0019] In one possible implementation, the outer edge structure includes:

[0020] Top wall;

[0021] The first sidewall is connected to the outer side of the top wall;

[0022] And a second sidewall, connected to the inner side of the top wall, the inner structural part being connected to the second sidewall.

[0023] In one possible implementation, the second sidewall includes:

[0024] First side;

[0025] And a second side, which is circumferentially spaced from the first side along the outer edge structure portion, and the inner side structure portion is connected to at least one of the first side and the second side.

[0026] In one possible implementation, there are at least two second sides, located on either side of the first side.

[0027] In one possible implementation, one side of the inner structure is connected to the outer edge structure, and the other side is spaced apart from the outer edge structure, so as to form a connection channel for the tab to pass through between the outer edge structure and the inner structure.

[0028] In one possible implementation, the outer side of the body portion is connected to the inner side of the second sidewall, and the connecting portion is connected to the top wall.

[0029] A second aspect of this application provides a cover plate structure, comprising:

[0030] The cover plate body, the insulation structure, and the aforementioned battery terminal structure.

[0031] In one possible implementation, the insulating structure is disposed between the battery terminal structure and the cover body to form insulation between the battery terminal structure and the cover body.

[0032] In one possible implementation, the cover plate body is formed with perforations for the electrode tabs to pass through.

[0033] In one possible implementation, the outer edge of the cover body is formed with an edge step for connecting with the battery casing.

[0034] In one possible implementation, the cover structure further includes a support seat disposed on the cover body and connected between the insulating structure and the cover body.

[0035] In one possible implementation, the support includes:

[0036] The first support portion is connected to the insulating structure;

[0037] The second support portion is connected to the cover plate body; and

[0038] The connecting part is located between the first support part and the second support part.

[0039] In one possible implementation, the cover plate structure further includes:

[0040] An insulating frame extends into a perforation formed in the cover plate body, and the insulating frame covers the wall of the perforation circumferentially.

[0041] In one possible implementation, the insulating frame includes:

[0042] The stop part is attached to the bottom wall of the cover plate body;

[0043] And an insulating part, which extends into the perforation and fits against the inner wall of the perforation.

[0044] A third aspect of this application provides a battery, comprising:

[0045] The above-mentioned cover plate structure;

[0046] case;

[0047] And an electrode core, disposed within the housing, the electrode core including an electrode tab connected to the terminal platform.

[0048] A fourth aspect of this application provides a battery pack including the aforementioned battery.

[0049] The fifth aspect of this application provides an electrical device including the aforementioned battery or battery pack. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 A schematic diagram of a battery according to an embodiment of this application is shown;

[0052] Figure 2 A cross-sectional view of a battery provided according to this application is shown;

[0053] Figure 3 A schematic diagram of a cover plate structure provided according to an embodiment of this application is shown;

[0054] Figure 4 An exploded view diagram provided according to an embodiment of this application is shown;

[0055] Figure 5 A cross-sectional view of a cover plate structure provided according to an embodiment of this application is shown;

[0056] Figure 6 A cross-sectional view of a cap provided according to an embodiment of this application is shown;

[0057] Figure 7 A top view of a cap provided according to an embodiment of this application is shown;

[0058] Figure 8 A cross-sectional view of a battery provided according to another embodiment of this application is shown.

[0059] Figure label:

[0060] 100 - Cover plate body; 101 - Perforation;

[0061] 200-Battery terminal structure; 201-Connection channel; 202-Support platform; 210-Terminal platform; 220-Cap; 211-Outer edge structure; 212-Inner side structure; 2111-Top wall; 2112-First side wall; 2113-Second side wall; 2113a-First side; 2113b-Second side; 222-Cover body; 223-Terminal part; 2221-Body body; 2222-Connecting part;

[0062] 300 - Insulation structure;

[0063] 400 - Support base; 410 - First support part; 420 - Second support part; 430 - Connecting part;

[0064] 500 - Insulating frame; 510 - Stopping part; 520 - Insulating part; 530 - Snap-fit ​​structure;

[0065] 10-Shell; 11-Receiving cavity;

[0066] 20 - pole core; 21 - pole tab; 21a - raised part; 21b - bent part;

[0067] 30 - Cover plate structure. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0069] Lithium-ion batteries are widely used in electrical devices in various fields such as consumer electronics, wearable products, home appliances, and vehicles due to their advantages such as high cycle life, energy saving and environmental protection, and high charging efficiency, providing power to these devices.

[0070] Lithium-ion batteries typically include a casing, an electrode core, and a cover structure. The casing has a receiving cavity in which the electrode core can be housed. The cover structure forms a sealed connection with the casing to seal the electrode core within the receiving cavity. Furthermore, to form a positive or negative terminal on the cover structure (which can serve as a battery terminal structure for electrical connection with the aforementioned electrical device, allowing the lithium-ion battery to deliver electrical energy to the device), the cover structure needs to be electrically connected to the electrode core. This connection is usually achieved by welding, thus forming the positive or negative terminal on the cover structure.

[0071] In related technologies, the cover structure typically includes a cover body and terminal structures (positive or negative terminals) formed on the cover structure. The cover body needs to form a sealed connection with the housing, and the terminal structures need to be insulated from the rest of the cover body. Simultaneously, a seal must be maintained between the battery terminal structures and the rest of the cover body. The seals between the cover body and the housing, and between the battery terminal structures and the rest of the cover body, prevent external substances from entering the battery and also prevent substances inside the battery (such as electrolyte) from leaking out, ensuring battery life and safety. The insulation between the terminal structures and the rest of the cover body prevents current from being introduced into the housing, ensuring battery safety.

[0072] To achieve welding between the cover plate structure and the electrode core, a lead-out tab is provided on the side of the cover plate structure facing the shell. The electrode core may include a tab, which needs to be designed to have a certain length to achieve welding with the lead-out tab. After the tab and the lead-out tab are welded, the tab usually needs to be bent multiple times to form a fixed shape to distribute the force. This can prevent the root of the tab from being damaged by the compressive force, causing a short circuit in the positive or negative active material in the electrode core, or prevent the root of the tab from being damaged by the compressive force, causing a short circuit between the positive and negative electrode sheets. The welded structure formed between the lead-out tab and the tab is relatively complex in structure and occupies a lot of space inside the battery, which will affect the capacity of the lithium-ion battery. At the same time, because the welding position is directly opposite the electrode core, the welding slag formed during the welding process can easily enter the battery, which can easily cause a short circuit, posing a significant risk.

[0073] Furthermore, the length design of the tabs increases their cost, thus raising the manufacturing cost of lithium-ion batteries. The multiple bending design of the tabs also increases the process difficulty of lithium-ion batteries, thereby increasing their manufacturing complexity.

[0074] Based on the above-mentioned situation and problems, this application provides a battery with a structural design that differs from traditional technologies in terms of the cover plate structure and the electrode tabs of the electrode core. The electrode tabs can extend out of the shell to connect with the cover plate structure, and the cover plate structure forms a support platform away from the shell. The connection between the electrode tabs and the cover plate structure can be completed on this support platform. The connection position between the electrode tabs and the cover plate structure changes from inside the battery to outside the battery. For example, the electrode tabs and the cover plate structure can also be connected by welding, in which case the welding position is located outside the battery. In addition, this application also includes a cap, and the electrode tabs can be disposed between the cap and the terminal platform to form a seal. Through the structural design of the cap body and the terminal body, the connection difficulty between the cap and the terminal platform is reduced, the overall processing is simple, the process cost is low, and the battery welding yield is improved.

[0075] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0076] Figure 1 A schematic diagram of a battery provided in this application is shown; Figure 2 A cross-sectional view of a battery provided according to an embodiment of this application is shown.

[0077] Please refer to Figures 1 to 2 The battery includes a casing 10, an electrode core 20, and a cover structure 30.

[0078] The housing 10 serves as a protective structure for the battery and can be made of metal materials, such as steel or aluminum. The housing 10 has an internal receiving cavity 11.

[0079] The housing 10 can be designed as a structure with openings at both ends or one end. The cover structure 30 can be connected to both ends of the housing 10 or to one end of the housing 10.

[0080] The electrode core 20 is disposed within the housing 10. The electrode core 20 typically includes a positive electrode sheet, a separator, and a negative electrode sheet, which are stacked to form a stacked electrode core 20 structure. The positive electrode sheet typically includes a positive current collector and a positive electrode coating coated on the surface of the positive current collector, and the negative electrode sheet typically includes a negative current collector and a negative electrode coating coated on the surface of the negative current collector. The positive current collector can be made of aluminum foil, etc., and the negative current collector can be made of copper foil, etc. The positive electrode coating is typically a lithium-containing material. Through the exchange of lithium ions on the positive and negative electrode sheets, the electrode core 20 can store or release electrical energy.

[0081] For the electrode core 20, it can typically be configured to include multiple positive and negative electrode plates. The positive and negative current collectors can be bundled together by a reasonable design to form the electrode tab 21 of the entire electrode core 20. The electrode tab 21 can extend out of the housing 10 to connect with the terminal platform 212 in the cover plate structure 30.

[0082] For details, please refer to Figure 2 The cover plate structure 30 includes a cover plate body 100 and a battery terminal structure 200. The electrode tab 21 needs to be connected to the battery terminal structure 200. For this purpose, the cover plate body 100 is provided with a through hole 101, and the battery terminal structure 200 is provided with a connection channel 201. The connection channel 201 is located in the thickness direction of the cover plate structure 30 (i.e.,...). Figure 2 In the Z direction (the length direction of the pole core 20), it is located above the perforation 101, and the support platform 202 is located to the side of the connection channel 201. In other words, the tab 21 can pass through the perforation 101 and the connection channel 201 and connect to the side of the support platform 202 away from the pole core 20.

[0083] In some embodiments, the tabs 21 in the battery can extend beyond the housing 10 and connect to the side of the support platform 202 opposite to the electrode core 20. The connection between the tabs 21 and the support platform 202 can be achieved by welding, which avoids short circuits caused by welding slag entering the battery, improving battery safety. It also reduces the internal space occupied by the welded structure formed between the cover plate structure 30 and the electrode core 20, providing more space for the electrode core 20 and thus increasing battery capacity. Furthermore, by providing an insulating structure 300 between the cover plate body 100 and the battery terminal structure 200, direct contact between the cover plate body 100 and the battery terminal structure 200 of different polarities can be avoided, preventing short circuits and improving battery safety.

[0084] In the embodiments of this application, the battery can be a square battery or a cylindrical battery. Correspondingly, the casing 10, the cover structure 30, and the electrode core 20 can be designed into corresponding structures. For example, in the following embodiments, the casing 10, the cover structure 30, and the electrode core 20 can all be designed into rectangular structures.

[0085] In some embodiments, please refer to Figure 2 The tab 21 includes a gathered portion 21a and a bent portion 21b. The gathered portion 21a is a collective structure formed after combing and binding each positive current collector and negative current collector. The bent portion 21b is a structure in the tab 21 that needs to extend out of the shell 10.

[0086] The bent portion 21b is connected to the gathered portion 21a, and the bent portion 21b passes through the through hole 101 and the connecting channel 201 and is connected to the support platform 202.

[0087] The tab 21 has been simplified in structure. When the tab 21 is connected to the support platform 202, the bent part 21b can overlap the support platform 202. The support platform 202 can provide support force to the current collector and prevent the tab 21 from short-circuiting due to compression. The tab 21 does not need to be bent multiple times to ensure its basic function. The tab 21 in this embodiment can be designed to be shorter and does not need to be bent multiple times (it can be bent only once), which can reduce the manufacturing cost of lithium-ion batteries and simplify the manufacturing difficulty of lithium-ion batteries.

[0088] Figure 3A schematic diagram of a cover plate structure provided according to an embodiment of this application is shown; Figure 4 An exploded view diagram provided according to an embodiment of this application is shown; Figure 5 A cross-sectional view of a cover plate structure provided according to an embodiment of this application is shown; Figure 6 A cross-sectional view of a cap provided according to an embodiment of this application is shown.

[0089] In some embodiments, please refer to Figures 3 to 5 The cover structure 30 includes a cover body 100, a battery terminal structure 200, and an insulation structure 300.

[0090] The cover plate body 100 is a structure in the cover plate structure 30 that needs to be connected with the housing 10. The cover plate body 100 can be made of metal such as aluminum. The cover plate body 100 can be closed at one end of the housing 10. The cover plate body 100 has a through hole 101 that communicates with the receiving cavity 11 of the housing 10.

[0091] The structure of the perforation 101 can be designed according to different structures of the tab 21. In some embodiments, the tab 21 can be designed as a flat structure along the length of the core 20. To adapt to this structure of the tab 21, the perforation 101 can be a long strip hole with a small opening. Of course, the perforation 101 can also be a rectangular hole with a large opening.

[0092] The battery terminal structure 200 can serve as the positive or negative terminal in the cover plate structure 30. The battery terminal structure 200 can be disposed on the cover plate body 100. The battery terminal structure 200 forms a connection channel 201 that communicates with the through hole 101. The connection channel 201 can be a long strip hole or a rectangular hole.

[0093] It is understandable that after passing through the perforation 101 and the connection channel 201, the tab 21 can be connected to the battery terminal structure 200, so that current can be introduced from the tab 21 to the battery terminal structure 200. In order to improve the safety of battery use and prevent current from being introduced into the cover body 100, an insulation structure 300 needs to be provided between the cover body 100 and the battery terminal structure 200.

[0094] The function of the insulating structure 300 is to form insulation between the cover plate body 100 and the battery terminal structure 200. The insulating structure 300 can be designed according to the specific structure of the cover plate body 100 and the battery terminal structure 200. As a general design principle, the insulating structure 300 needs to be able to separate the cover plate body 100 and the battery terminal structure 200.

[0095] In some cases, the insulating structure 300 may surround the outer periphery of the battery terminal structure 200; in other cases, the insulating structure 300 may be sandwiched between the cover body 100 and the battery terminal structure 200.

[0096] The battery terminal structure 200 has a support platform 202 formed on one side of the connection channel 201, so that the tab 21 can be connected to the support platform 202 after passing through the connection channel 201.

[0097] In some embodiments, the cover structure 30 can be connected to the end of the housing 10. Based on the design of the perforation 101, the cover structure 30 allows the tab 21 to pass through the perforation 101 and reach the location of the battery terminal structure 200. Based on the design of the connection channel 201, the cover structure 30 allows the tab 21 to reach the side of the support platform 202 opposite to the electrode core 20. The tab 21 in the battery can extend beyond the housing 10 and connect to the side of the support platform 202 opposite to the electrode core 20. The connection between the tab 21 and the support platform 202 can be achieved by welding, which can avoid short circuits caused by welding slag entering the battery, improving battery safety. This external welding method can also reduce the internal space occupied by the welded structure formed between the cover structure 30 and the electrode core 20, providing more space for the electrode core 20 and thus increasing battery capacity. In addition, the support platform 202 can support the tab 21, which can prevent the tab 21 from short-circuiting due to compression. The tab 21 can maintain its basic function without having to bend multiple times. The tab 21 in this embodiment can be designed to be shorter and does not need to be bent multiple times (it can be bent only once), which can reduce the manufacturing cost of lithium-ion batteries and simplify the manufacturing difficulty of lithium-ion batteries.

[0098] In some embodiments, please refer to Figures 3 to 5 The battery terminal structure 200 includes a terminal platform 210, which includes an outer edge structure portion 211 and an inner side structure portion 212.

[0099] The inner structural part 212 is connected to the outer structural part 211 and extends to the inside of the outer structural part 211, forming the aforementioned support platform 202.

[0100] Understandably, the outer edge structure 211 is the edge structure of the terminal platform 210, which can improve the structural strength of the terminal platform 210 at its edge. The inner structure 212 is connected to the outer edge structure 211. After the electrode tab 21 is connected to the support platform 202 formed by the inner structure 212, the terminal platform 210 has good structural strength from the outside to the inside, which can prevent the terminal platform 210 from deforming.

[0101] As described above, the terminal platform 210 can adopt a rectangular structure, wherein the outer edge structure 211 can form a rectangular frame, i.e., a ring structure with through holes, and the inner side structure 212 can be connected to the frame.

[0102] In some embodiments, please refer to Figure 5 The outer edge structure 211 includes a top wall 2111, a first side wall 2112 and a second side wall 2113. The first side wall 2112 is connected to the outer side of the top wall 2111, the second side wall 2113 is connected to the inner side of the top wall 2111, and the inner side structure 212 is connected to the second side wall 2113.

[0103] Here, through the design of the first sidewall 2112 and the second sidewall 2113, the outer edge structure 211 can form two structural rings from the outside to the inside, one of which is formed by the first sidewall 2112 and the other by the second sidewall 2113. This two-layer structural ring design can improve the structural strength of the outer edge structure 211.

[0104] Furthermore, by designing the lengths of the first sidewall 2112 and the second sidewall 2113, the installation of the insulation structure 300 can be better matched, for example, in Figure 5 In the example shown, the first sidewall 2112 can abut against the insulating structure 300. The first sidewall 2112, the top wall 2111, the insulating structure 300 and the second sidewall 2113 can form a stress relief cavity, so that the terminal platform 210 has a stress relief space, which can further improve the structural strength of the terminal platform 210.

[0105] Furthermore, the curvature design of the junction between the first sidewall 2112 and the insulating structure 300, the junction between the first sidewall 2112 and the top wall 2111, and the junction between the top wall 2111 and the second sidewall 2113 enhances the structural strength of the outer edge structure 211 and reduces the connection stress at each connection point. The angle of the curvature is not limited; in this embodiment, 90° is used as an example.

[0106] In some embodiments, please refer to Figure 5 The second sidewall 2113 includes a first side 2113a and a second side 2113b. The second side (2113b) and the first side (2113a) are spaced apart circumferentially along the outer edge structure (211). The inner side structure 212 is connected to at least one of the first side 2113a and the second side 2113b.

[0107] In some specific embodiments, the first side 2113a is the long side of the outer edge structure 211, the second side 2113b is the short side of the outer edge structure 211, and the inner structure 212 can be connected to the first side 2113a, the second side 2113b, or the inner structure 212 can be connected to both the first side 2113a and the second side 2113b. There are at least two second sides 2113b, which are located on both sides of the first side 2113a.

[0108] In some embodiments, one side of the inner structural portion 212 is connected to the outer edge structure 211, and the other side is spaced apart from the outer edge structure 211 to form a connection channel 201 for the electrode tab to pass through between the outer edge structure 211 and the inner structural portion 212. The connection channel 201 may be an elongated hole. Specifically, the inner structural portion 212 is connected to the first side edge 2113a of the outer edge structure 211, extends toward the through hole of the outer edge structure 211, and is spaced apart from the frame of the outer edge structure 211 to form the connection channel 201.

[0109] In some embodiments, please refer to Figures 3 to 5 The battery terminal structure 200 also includes a cover 220, which covers the support platform 202.

[0110] As mentioned above, the tab 21 is connected to the side of the support platform 202 away from the electrode core 20. In order to protect the tab 21 and prevent external interference from entering the cover structure 30, after the tab 21 is connected to the support platform 202, a cover 220 can be set on the top of the support platform 202.

[0111] The cover 220 can be made of metal, and the material of the cover 220 can be consistent with that of the tab 21 and the terminal platform 210. For example, it can be copper or aluminum. It is understood that the current in the tab 21 can be transmitted to the battery terminal structure 200, and then from the battery terminal structure 200 to the cover 220.

[0112] In some embodiments, please refer to Figure 5 The cover 220 includes a cover body portion 222 and a terminal portion 223. The cover body portion 222 includes a body portion 2221 and a connecting portion 2222. The body portion 2221 forms a receiving space with an opening on one side. At least a portion of the terminal portion 223 is located in the receiving space. The connecting portion 2222 is used for fixed connection with the terminal platform 210.

[0113] In some specific embodiments, in order to cooperate with the cover 220, the terminal platform 210 has a recessed area for accommodating a portion of the structure of the cover 220, so that a portion of the structure of the cover 220 can be housed within the terminal platform 210. When the portion of the structure of the cover 220 is housed within the recessed area of ​​the terminal platform 210, the outer side of the body portion 2221 can fit against the inner wall of the recessed area, i.e., connect to the inner side of the second side wall 2113. The connecting portion 2222 can overlap the edge of the terminal platform 210 around the recessed area, i.e., connect to the top wall 2111, so that the connecting portion 2222 and the outer connector 20 can be connected.

[0114] In some specific embodiments, please refer to Figure 2 , Figure 5 and Figure 6 This refers to the negative electrode cover structure of the battery. The cover 220 of the negative electrode cover structure can be a separate structure or a copper-aluminum composite integrated structure prepared by casting and rolling. When prepared by casting and rolling, aluminum ingots and copper plates and strips are used as raw materials to continuously cast and roll copper-aluminum composite plates; the processed plates are then machined to remove the aluminum from the top edge area, exposing the copper side area, and then stamped to produce an integrated cover 220 structure that meets the structural requirements. The terminal portion 223 is an aluminum terminal, and the cover portion 222 is a copper cover plate. The thickness h1 of the terminal portion 223 satisfies 0.3mm≤h1≤3mm, ensuring the manufacturability of the terminal portion 223 without wasting too much material. The thickness h2 of the cover portion 222 satisfies 0.1mm≤h2≤1.5mm, ensuring the strength of the cover portion 222 and providing as much space as possible to accommodate the terminal portion 223. The height h3 of the terminal portion 223 protruding from the cover portion 222 satisfies 0mm≤h3≤1mm, ensuring that at least part of the terminal portion 223 can be used to connect to external copper busbars or busbars without occupying too much space. Thus, the terminal portion 223 and the cover portion 222 are tightly integrated without an intermediate filler solder layer and are integrally cast and rolled.

[0115] In some specific embodiments, please refer to Figure 7 , Figure 7 A top view of a cover according to an embodiment of this application is shown. Terminal portion 223 is an aluminum terminal, and cover portion 222 is a copper cover plate. Terminal portion 223 is embedded within cover portion 222. The outer edge region of cover portion 222 has no aluminum material. Laser welding is performed on the outer edge region of cover portion 222. The width d of this region, i.e., the width of the connecting portion 2222, satisfies 2mm ≤ d ≤ 10mm to ensure effective laser connection. The laser welding penetration depth is 0.2~1.5mm, and the weld width is 0.2~2mm.

[0116] In some other specific embodiments, please refer to Figure 8 , Figure 8A cross-sectional view of a battery according to another embodiment of this application is shown. The positive electrode cover structure of the battery is shown. The cover 220 of the positive electrode cover structure is an integral structure. Specifically, the terminal portion 223 and the cover portion 222 are an integral piece, that is, an integral aluminum cover.

[0117] In some embodiments, please refer to Figures 3 to 5 The insulating structure 300 is an insulating ring, along the thickness direction of the cover plate structure 30, which is also the length direction of the pole core 20. Figure 2 (in the Z direction), the insulating ring is disposed between the first sidewall 2112 and the cover plate body 100.

[0118] The insulating ring forms an insulation between the cover plate body 100 and the battery terminal structure 200 in an enclosing manner. The insulating ring is made of materials with insulating properties such as ceramic or plastic. The first sidewall 2112 abuts against one side of the insulating ring, and the cover plate body 100 abuts against the other side of the insulating ring. Thus, the insulating ring can separate the cover plate body 100 and the battery terminal structure 200, thereby playing an insulating role.

[0119] In some embodiments, please refer to Figure 5 The dimension of the first sidewall 2112 along the thickness direction of the cover plate structure 30 is smaller than the dimension of the second sidewall 2113 along the thickness direction of the cover plate structure 30. In other words, the second sidewall 2113 is longer than the first sidewall 2112 in the thickness direction, and the bottom wall of the insulating ring is located below the bottom end of the second sidewall 2113 in the direction toward the pole core 20.

[0120] By designing the dimensions of the first sidewall 2112 and the second sidewall 2113, the insulating ring can fill the dimensional difference between the first sidewall 2112 and the second sidewall 2113. This design can make the most of the space around the battery terminal structure 200 while achieving insulation, and can reduce the thickness of the cover structure 30 to a certain extent, thereby making the battery more compact in structure.

[0121] In some embodiments, please refer to Figure 5 An edge step 102 is formed on the outer edge of the cover body 100 for connecting with the battery casing 10.

[0122] In some embodiments, please refer to Figures 3 to 5 The cover structure 30 also includes a support base 400, which is disposed on the cover body 100. The support base 400 can be connected between the battery terminal structure 200 and the cover body 100. The support base 400 is used to separate the battery terminal structure 200 from the cover body 100.

[0123] In conjunction with the foregoing, when the support base 400 is provided, the support base 400 can abut against the aforementioned insulating ring. The support base 400 is located between the cover plate body 100 and the insulating ring. By providing the support base 400, the battery terminal structure 200 and the cover plate body 100 can be separated from each other in the thickness direction, thereby improving the insulation performance between the cover plate body 100 and the battery terminal structure 200.

[0124] In some embodiments, please refer to Figure 5 The support base 400 includes a first support portion 410, a second support portion 420, and a connecting portion 430. The first support portion 410 is used to connect the insulating structure 40, the second support portion 420 is used to connect the cover plate body 30, and the connecting portion 430 is connected between the first support portion 410 and the second support portion 420. The connecting portion 430 is used to connect the first support portion 410 and the second support portion 420 together so that the support base 400 forms an integral structure.

[0125] The support base 400 can be made of metal. The first support part 410 can be connected to the insulating structure 40 by laser welding, and the second support part 420 can be connected to the cover plate body 30 by laser welding.

[0126] The first support portion 410 and the second support portion 420 can be located on the same side of the joint portion 430 or on opposite sides of the joint portion 430. When the first support portion 410 and the second support portion 420 are located on opposite sides of the joint portion 430, the first support portion 410 and the second support portion 420 are respectively located on opposite sides of the joint portion 430 in the thickness direction, and the first support portion 410 and the second support portion 420 are respectively located at opposite ends of the joint portion 430. Thus, when the support base 400 is connected between the cover plate body 30 and the insulating structure 40, the first support portion 410 and the second support portion 420 are arranged along the thickness direction of the cover plate body 30. This arrangement increases the support strength of the support base 400 and can also be used to reduce the connection stress when the support base 400, the insulating structure 40, and the cover plate body 30 are connected.

[0127] In some embodiments, please refer to Figures 3 to 5 The cover structure 30 also includes an insulating frame 500, which can be made of insulating materials such as plastic. The insulating frame 500 extends into the perforation 101 and can cover the hole wall of the perforation 101 circumferentially. For example, the insulating frame 500 surrounds the inner wall of the perforation 101 of the cover body 100 circumferentially.

[0128] As mentioned above, the tab 21 needs to pass through the perforation 101 to form a connection with the support platform 202. In order to prevent an electrical connection between the cover plate body 100 and the tab 21, insulation needs to be formed between the tab 21 and the cover plate body 100. Here, insulation can be formed between the tab 21 and the cover plate body 100 by setting the insulation frame 500.

[0129] In some specific embodiments, please refer to Figure 4 and Figure 5 The insulating frame 500 includes a stop portion 510 and an insulating portion 520. The stop portion 510 is attached to the bottom wall of the cover plate body 100 and can restrict the electrode core 20 to prevent the electrode core 20 from shaking inside the housing 10. The insulating portion 520 can extend into the perforation 101 and can be attached to the inner wall of the perforation 101 to achieve a stable fit between the insulating frame 500 and the cover plate body 100 and to form insulation between the cover plate body 100 and the electrode tab 21.

[0130] It should be noted that the stop portion 510 and the insulating portion 520 are two components of the insulating frame 500, and do not mean that the insulating frame 500 is a separate structure. Of course, in some embodiments, the insulating frame 500 may also be a separate structure, and the stop portion 510 and the insulating portion 520 may be manufactured separately, and the materials used for them may be the same or different.

[0131] In some embodiments, the insulating frame 500 is further provided with a snap-fit ​​structure 530, which is at least used to snap and fix the cover plate body 100 of the cover plate structure 30 and the insulating frame 500.

[0132] As can be seen from the foregoing embodiments, the insulating frame 500 can form insulation between the cover body 100 and the tab 21. The insulating frame 500 is disposed on the side of the cover body 100 facing the through hole 101. The buckle structure 550 here can improve the connection strength between the cover body 100 and the insulating frame 500, prevent the insulating frame 500 from detaching from the cover body 100, and improve the structural strength of the cover structure 30 while ensuring insulation performance, thereby improving the safety performance of the battery.

[0133] The battery pack of this application embodiment may include the battery described above.

[0134] Specifically, the battery pack may contain multiple batteries as described above, which may be connected in series and / or in parallel.

[0135] The battery pack of this embodiment, by using the battery of the above embodiment, can increase the battery pack capacity, thereby improving the battery life and also improving safety.

[0136] The electrical equipment in this application embodiment may include the battery or battery pack described in the above embodiment.

[0137] For example, when the electrical equipment is a mobile phone, tablet computer, laptop computer, or similar device, the aforementioned battery can be used as an energy storage and supply device. When the electrical equipment is a vehicle, energy storage cabinet, energy storage container, or similar device, the aforementioned battery pack can be used as an energy storage and supply device.

[0138] The electrical equipment in this embodiment, by using the battery or battery pack described above, is beneficial for improving battery life and enhancing safety.

[0139] In the description of this application, it should be understood that the terms "comprising" and "having" and any variations thereof used in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0140] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the connection within two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery terminal structure (200) characterized by, include: Terminal platform (210) for connection to the battery tabs (21); A cover (220) includes a cover body (222) and a terminal part (223). The cover body (222) includes a main body (2221) and a connecting part (2222). The main body (2221) has a receiving space with an opening on one side. At least a portion of the terminal part (223) is located in the receiving space. The connecting part is used to be fixedly connected to the terminal platform (210). The connecting portion is disposed on the circumferential edge of the terminal portion (223).

2. The battery terminal structure (200) according to claim 1, characterized in that, The cover portion (222) and the terminal portion (223) are an integral structure.

3. The battery terminal structure (200) according to claim 1, characterized in that, The cover part (222) is made of copper, and the terminal part (223) is made of aluminum.

4. The battery terminal structure (200) of claim 1, wherein, The thickness of the terminal portion (223) is h1, 0.3mm≤h1≤3mm; The thickness of the cover portion (222) is h2, 0.1mm≤h2≤1.5mm; The height of the terminal portion (223) protruding from the cover portion (222) is h3, where 0mm≤h3≤1mm.

5. The battery terminal structure (200) of claim 1, wherein, The width of the connecting part (2222) is d, 2mm≤d≤10mm.

6. The battery terminal structure (200) of claim 1, wherein, The terminal platform (210) includes: The outer edge structure (211) is an annular structure with through holes; And an inner structure (212) that is connected to the outer edge structure (211) and extends to the inside of the outer edge structure (211), the inner structure (212) forming a support platform (202), and the tab (21) connected to the support platform (202).

7. The battery terminal structure (200) according to claim 6, characterized in that The outer edge structure (211) includes: Top wall (2111); The first sidewall (2112) is connected to the outside of the top wall (2111); And a second sidewall (2113) connected to the inside of the top wall (2111), the inner side structure (212) being connected to the second sidewall (2113).

8. The battery terminal structure (200) according to claim 7, characterized in that The second sidewall (2113) includes: First side (2113a); And a second side (2113b) is provided circumferentially spaced from the first side (2113a) along the outer edge structure (211), and the inner side structure (212) is connected to at least one of the first side (2113a) and the second side (2113b).

9. The battery terminal structure (200) according to claim 8, characterized in that The second side (2113b) is at least two, and is located on both sides of the first side (2113a).

10. The battery terminal structure (200) of claim 6, wherein, One side of the inner structure (212) is connected to the outer edge structure (211), and the other side is spaced apart from the outer edge structure (211) to form a connection channel (201) for the tab (21) to pass through between the outer edge structure (211) and the inner structure (212).

11. The battery terminal structure (200) of claim 7, wherein, The outer side of the main body (2221) is connected to the inner side of the second sidewall (2113), and the connecting part (2222) is connected to the top wall (2111).

12. A cover plate structure (30) characterized by include: The cover body (100), the insulating structure (300), and the battery terminal structure (200) according to any one of claims 1 to 11.

13. The cover plate structure (30) according to claim 12, characterized in that The insulating structure (300) is disposed between the battery terminal structure (200) and the cover body (100) to form insulation between the battery terminal structure (200) and the cover body (100).

14. The cover plate structure (30) according to claim 12, characterized in that The cover plate body (100) has a perforation (101) for the tab (21) to pass through.

15. The cover plate structure (30) according to claim 12, characterized in that The outer edge of the cover body (100) is formed with an edge step (102) for connecting with the battery casing (10).

16. The cover plate structure (30) according to claim 12, characterized in that The cover plate structure (30) further includes a support base (400), which is disposed on the cover plate body (100) and is connected between the insulating structure (300) and the cover plate body (100).

17. The cover plate structure (30) according to claim 16, characterized in that The support base (400) includes: The first support part (410) is connected to the insulating structure (300); The second support (420) is connected to the cover plate body (100); and The connecting part (430) is connected between the first support part (410) and the second support part (420).

18. The cover plate structure (30) according to any one of claims 12 to 17, characterized in that The cover plate structure (30) also includes: An insulating frame (500) extends into a perforation (101) formed in the cover body (100), and the insulating frame (500) covers the wall of the perforation (101) circumferentially.

19. The cover plate structure (30) according to claim 18, characterized in that The insulating frame (500) includes: The stop part (510) is attached to the bottom wall of the cover plate body (100); And an insulating part (520) extends into the perforation (101) and fits against the inner wall of the perforation (101).

20. A battery, characterized by include: The cover plate structure (30) according to any one of claims 12 to 19; Shell (10); And an electrode core (20) is disposed within the housing (10), the electrode core (20) including an electrode tab (21) connected to the terminal platform (210).

21. A battery pack, characterized by Includes the battery as described in claim 20.

22. An electrical device, comprising: Includes the battery of claim 20; or the battery pack of claim 21.

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