Cover plate structure, battery, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a cover plate structure, a battery, a battery pack and electric equipment.The cover plate structure comprises a cover plate main body, a connecting terminal and an insulating structure, a first through hole is formed in the cover plate main body and located on the side, back to a pole core, of the cover plate main body, and a supporting platform is formed on the connecting terminal and located on the side, back to the pole core, of the cover plate main body; the connecting terminal comprises a second through hole penetrating through the supporting platform, the second through hole is communicated with the first through hole, and the first through hole and the second through hole are suitable for a tab to penetrate through, so that the tab is connected to one side, back on to the pole core, of the supporting platform; the insulation structure is arranged between the cover plate main body and the connecting terminal so as to form insulation between the cover plate main body and the connecting terminal, the insulation structure further covers the inner wall of the first through hole, and at least part of the insulation structure is arranged on the cover plate main body in an injection molding mode. According to the embodiment of the invention, the safety performance and the capacity of the battery can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a cover 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 welding process between the cover plate structure and the electrode core needs to be completed on the side of the cover plate structure facing the electrode core. The welding position is directly opposite the location of the electrode core. The welding slag formed during the welding process can easily enter the battery, which can easily cause a short circuit and poses a significant risk. This welding method will occupy the internal space of the lithium-ion battery and affect the capacity of the lithium-ion battery. Utility Model Content

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

[0005] The first aspect of this application provides a cover plate structure, comprising:

[0006] A cover plate body, wherein a first through hole is formed in the cover plate body;

[0007] A connecting terminal is located on the side of the cover plate body facing away from the pole core. The connecting terminal forms a support platform. The connecting terminal includes a second through hole penetrating the support platform and the second through hole communicates with the first through hole. The first through hole and the second through hole are adapted for the electrode tab to pass through so that the electrode tab is connected to the side of the support platform facing away from the pole core.

[0008] The cover plate body and the connecting terminal are provided with an insulating structure, which is disposed between the cover plate body and the connecting terminal to form insulation between the cover plate body and the connecting terminal. The insulating structure also covers the inner wall of the first through hole, wherein at least a portion of the insulating structure is injection molded onto the cover plate body.

[0009] According to the cover plate structure described in the first aspect of this application, the cover plate structure can be connected to the end of the housing. Based on the design of the first through hole on the cover plate body and the design of the second through hole on the connecting terminal, the cover plate structure allows the tab to reach the side of the support platform away from the electrode core after passing through the first and second through holes. This allows the tab in the battery to extend out of the housing and connect to the side of the support platform away from the electrode core. This structural form allows the connection between the tab and the connecting terminal to be made outside the housing, which can avoid short circuit problems caused by welding slag entering the battery, improve the safety performance of the battery, and save the internal space of the battery occupied by the connecting structure, providing more space for the electrode core and thus increasing the battery capacity.

[0010] In addition, the insulating structure formed between the cover plate body and the connecting terminal can form insulation between the two to ensure safety. At least part of the insulating structure can be injection molded on the cover plate body, which can improve the connection strength and simplify the manufacturing process.

[0011] In one possible implementation, the support platform includes a support plane adapted to be welded to the electrode tab.

[0012] In one possible implementation, the connection terminal includes a base having a second through hole, and at least a portion of the base's structure forms the support platform.

[0013] In one possible implementation, the connection terminal further includes a support portion that protrudes from the base body, and the portion of the base body located inside the support portion forms the support platform.

[0014] In one possible implementation, the connection terminal further includes:

[0015] A cover is disposed on the support and covers the top of the seat, or the cover is disposed within the space defined by the support and the seat.

[0016] In one possible implementation, a first step is formed on the support portion, and the cover is disposed on the first step.

[0017] In one possible implementation, the cap comprises a metal composite.

[0018] In one possible implementation, the metal composite comprises a copper-aluminum composite block.

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

[0020] Multiple insulating layers are sandwiched between the terminal platform and the cover plate body.

[0021] In one possible implementation, the insulation structure includes:

[0022] A first insulating element, wherein the first insulating element at least covers the periphery of the first through hole;

[0023] And a second insulating member, which abuts against the first insulating member and is located between the connecting terminal and the cover plate body.

[0024] The first and / or the second insulating element are injection molded onto the cover plate body.

[0025] In one possible implementation, the cover body includes a first surface facing the connection terminal, a second surface facing away from the connection terminal, and a third surface connected between the first surface and the second surface. The first insulating member includes a first bonding portion attached to the first surface, a second bonding portion attached to the second surface, and a third bonding portion attached to the third surface. The second insulating member abuts against the first bonding portion.

[0026] In one possible implementation, the cover body has a second step formed on the side away from the connection terminal, and the first insulating member further includes a fourth fitting portion attached to the second step, the fourth fitting portion being connected to the second fitting portion.

[0027] In one possible implementation, the connection terminal further includes a protrusion projecting away from the second through hole, the second insulating member being bent and covering the outer wall of the protrusion.

[0028] In one possible implementation, the cover plate structure further includes:

[0029] A connector, which is connected between the second insulating member and the connecting terminal.

[0030] In one possible implementation, the second insulating member is provided with a slot, and at least a portion of the connector is disposed within the slot.

[0031] In one possible implementation, the second insulating element is an insulating ceramic element, the connector is welded and fixed between the second insulating element and the connecting terminal, and the second insulating element is welded and fixed to the cover plate body.

[0032] In one possible implementation, a recessed area is formed on the cover plate body, and the first fitting portion and at least a portion of the second insulating member are disposed within the recessed area.

[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 first insulating element is an insulating injection molded part.

[0035] In one possible implementation, the second insulating element is an insulating ceramic element, which is welded to the connecting terminal and to the cover plate body.

[0036] In one possible implementation, the edge step forms a weld with the shell.

[0037] A second aspect of this application provides a battery, comprising:

[0038] case;

[0039] An electrode core is disposed within the housing, and the electrode core includes electrode tabs;

[0040] The cover plate structure is connected to the end of the housing, and the electrode tab passes through the first through hole and the second through hole and is connected to the side of the support platform opposite to the electrode core.

[0041] According to the battery described in the second aspect of this application, the tabs in the battery can extend outside the casing and connect to the side of the support platform opposite to the electrode core. The connection between the tabs and the support platform can be achieved by welding, which can avoid short circuit problems caused by welding slag entering the battery. This can improve the safety performance of the battery and reduce the internal space occupied by the welded structure formed between the cover plate structure and the electrode core, providing more space for the electrode core and thus increasing the battery capacity.

[0042] In one possible implementation, the electrode includes:

[0043] Gathering part;

[0044] And a bending portion, connected to the raised portion, the bending portion passing through the first through hole and the second through hole and connected to the support platform.

[0045] A third aspect of this application provides a battery pack including the aforementioned battery.

[0046] The fourth aspect of this application provides an electrical device including the aforementioned battery or battery pack. Attached Figure Description

[0047] 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.

[0048] Figure 1 A schematic diagram of a battery according to a first-type embodiment of this application is shown;

[0049] Figure 2 A cross-sectional view of a battery provided according to a first-type embodiment of this application is shown;

[0050] Figure 3 A schematic diagram of a cover plate structure according to a first-type embodiment of this application is shown;

[0051] Figure 4 An exploded view diagram is shown according to a first-type embodiment of this application;

[0052] Figure 5 A cross-sectional view of a cover plate structure provided according to a first-type embodiment of this application is shown;

[0053] Figure 6 Another cross-sectional view of a cover plate structure provided according to a first-type embodiment of this application is shown;

[0054] Figure 7 An exploded schematic diagram of a battery according to a second type embodiment of this application is shown;

[0055] Figure 8 It shows Figure 7 A magnified view of part A in the middle;

[0056] Figure 9 A schematic diagram of an insulating frame according to a second type embodiment of this application is shown;

[0057] Figure 10 It shows Figure 9 A magnified view of part B in the middle;

[0058] Figure 11 A partial cross-sectional view of a battery provided according to a second type embodiment of this application is shown;

[0059] Figure 12 An exploded schematic diagram of a battery according to a third-class embodiment of this application is shown;

[0060] Figure 13 It shows Figure 12A magnified view of a portion of C in the image;

[0061] Figure 14 A schematic diagram of an insulation structure provided according to a third type of embodiment of this application is shown;

[0062] Figure 15 A partial cross-sectional view of a battery provided according to a third type embodiment of this application is shown;

[0063] Figure 16 A partial cross-sectional view of a battery provided according to a fifth-class embodiment of this application is shown;

[0064] Figure 17 An exploded view of a cover plate structure provided according to a fifth embodiment of this application is shown.

[0065] Figure label:

[0066] 100 - Cover plate body; 101 - First through hole; 102 - Edge step; 103 - Support groove; 104 - First surface; 105 - Second surface; 106 - Third surface; 107 - Second step; 108 - Recessed area; 1021 - First mating surface; 1022 - Second mating surface;

[0067] 200-Connecting terminal; 201-Second through hole; 202-Supporting platform; 202a-Supporting plane; 210-Terminal platform; 220-Cap; 210a-First step; 211-Outer edge structure; 212-Inner side structure; 213-Base; 214-Supporting part; 215-Protrusion; 221-Lumber; 222-Copper block part; 223-Aluminum block part; 2111-Top wall; 2112-First side wall; 2113-Second side wall; 2113a-First side edge; 2113b-Second side edge;

[0068] 300 - Insulating structure; 310 - Insulating ring; 320 - Insulating layer; 330 - First insulating component; 340 - Second insulating component; 331 - First mating part; 332 - Second mating part; 333 - Third mating part; 334 - Fourth mating part; 341 - Slot; 3111 - First mating surface; 3112 - Second mating surface; 3113 - Groove;

[0069] 400 - Support; 410 - Connecting part; 420 - Supporting part; 411 - First connecting part; 412 - Second connecting part;

[0070] 500-Insulating frame; 510-Stop part; 520-Insulating part; 530-Reinforcing rib; 540-Insulating frame body; 550-Snap-on structure; 550a-First snap-on group; 550b-Second snap-on group; 541-Void groove; 542-Insulating plate; 543-Insulating ring; 544-Sunk area; 551-Hook; 552-Hook post; 5511-Arch part; 5512-Barb; 550a1-First snap; 550a2-Second snap; 550b1-Third snap; 550b2-Fourth snap;

[0071] 600 - Insulating film;

[0072] 700-Connector;

[0073] 10-Shell; 11-Receiving cavity;

[0074] 20 - pole core; 21 - pole tab; 21a - raised part; 21b - bent part; 21a1 - first end; 21a2 - second end; 21a3 - convex end;

[0075] 30 - Cover plate structure. Detailed Implementation

[0076] 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.

[0077] 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.

[0078] 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 connection terminal 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.

[0079] In related technologies, the welding process between the cover plate structure and the electrode core needs to be completed on the side of the cover plate structure facing the electrode core. That is, during the process of assembling the cover plate structure onto the housing in a specified posture according to the assembly sequence, the cover plate structure will be close to the housing. At this time, the cover plate structure has a side facing the housing, and the electrode core needs to be welded to this side. This welding method makes the welding position directly opposite the electrode core. After the welding is completed, the welded structure formed between the cover plate structure and the electrode core will occupy the internal space of the lithium-ion battery.

[0080] Specifically, the cover structure in related technologies typically includes a cover body and connecting terminals (positive or negative terminals) formed on the cover structure. The cover body needs to form a sealed connection with the housing, and the connecting terminals need to be insulated from the rest of the cover body. Simultaneously, a seal must be maintained between the connecting terminals and the rest of the cover body. The seal between the cover body and the housing, and between the connecting terminals and the rest of the cover body, prevents external substances from entering the battery and also prevents substances inside the battery (such as electrolyte) from leaking out, ensuring battery life and safety. The insulation between the connecting terminals and the rest of the cover body prevents current from being introduced into the housing, ensuring battery safety.

[0081] 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.

[0082] 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.

[0083] Based on the above-mentioned situation and problems, this application provides a battery with a structural design for the cover plate structure and the electrode tabs of the electrode core that differs from traditional technologies. 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 the 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.

[0084] It is understood that, by making the above-mentioned changes to the cover plate structure and the electrode core in the embodiments of this application, the connection position (such as the welding position) can be changed from inside the battery to outside the battery. This change can avoid the welding position being directly opposite the electrode core, avoid short circuit problems caused by welding slag entering the battery, improve the safety performance of the battery, and reduce the internal space of the battery occupied by the welding structure formed between the cover plate structure and the electrode core, providing more space for the electrode core to be arranged, thereby increasing the battery capacity.

[0085] Furthermore, as can be seen from the following embodiments of this application, the tabs in the embodiments of this application can be designed to be shorter and do not require multiple bends (only one bend is required), which can reduce the manufacturing cost of lithium-ion batteries and simplify the manufacturing difficulty of lithium-ion batteries.

[0086] In the following embodiments of this application, the cover plate structure includes a cover plate body, a connecting terminal formed on the cover plate body, and an insulating structure disposed between the cover plate body and the connecting terminal. The sealing design between the cover plate body and the housing can be achieved through structural cooperation between the two or by providing a sealing structure such as a sealing ring between them. The sealing design between the connecting terminal and the cover plate body can be achieved through structural cooperation between the two or by providing a sealing structure such as a sealing ring between them.

[0087] In the embodiments of this application, the cover plate structure as a whole can be designed to have different structural shapes, or a certain component of the cover plate structure can be designed to give the cover plate structure more technical advantages while maintaining the basic shape. These components can be the specific structural design of the connecting terminals, or the specific structural design of the insulation structure, etc.

[0088] In the following embodiments of this application, the tab of the electrode core is formed by the current collector on one side of the electrode core, and it can be connected to the support platform of the cover plate structure by a bending process.

[0089] In the embodiments of this application, based on the structural design that the electrode can extend out of the shell, the electrode can adopt a variety of specific structural designs, such as the design of the bending angle of the electrode, the design of the length of the electrode, and the design of the contact area between the electrode and the support platform. These design elements will be described in detail in the following embodiments.

[0090] The design points of the cover plate structure and the electrode tabs mentioned above will be fully described in the following embodiments. The first, second, third and fourth embodiments focus on describing the cover plate structure and will also describe the related design of the electrode tabs. The fifth embodiment focuses on describing the cover plate structure, and the related structure and parameters of the electrode tabs can be referred to the fourth embodiment.

[0091] Figure 1 A schematic diagram of a battery according to a first-type embodiment of this application is shown; Figure 2 A cross-sectional view of a battery provided according to a first-type embodiment of this application is shown.

[0092] In the first type of embodiment, please refer to Figures 1 to 2 The battery includes a casing 10, an electrode core 20, and a cover structure 30.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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 support platform 202 in the cover plate structure 30.

[0097] For details, please refer to Figure 2The cover plate structure 30 includes a cover plate body 100 and a connecting terminal 200, and the electrode lug 21 needs to be connected to the connecting terminal 200. For this purpose, a first through hole 101 is provided on the cover plate body 100, and a second through hole 201 is provided on the connecting terminal 200. The second through hole 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 first through hole 101, and the support platform 202 is located to the side of the second through hole 201. In other words, the second through hole 201 can pass through the support platform 202, and the pole tab 21 can pass through the first through hole 101 and the second through hole 201 and connect to the side of the support platform 202 away from the pole core 20.

[0098] In the first embodiment, 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 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 connecting terminal 200, direct contact between the cover plate body 100 and the connecting terminal 200 of different polarities can be avoided, preventing short circuits and improving battery safety.

[0099] 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.

[0100] 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.

[0101] The bent portion 21b is connected to the gathered portion 21a, and the bent portion 21b passes through the first through hole 101 and the second through hole 201 and is connected to the support platform 202.

[0102] 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.

[0103] In some embodiments, the thickness of the pole core 20 is L. When L < 18 mm, the second through hole 201 is located at a non-central position in the width direction of the connecting terminal 200. When L ≥ 18 mm, the second through hole 201 is located at the central or non-central position in the width direction of the connecting terminal 200.

[0104] This can be understood as follows: the size of the support platform 202 affects the contact area between the electrode tab 21 and the support platform 202. The size of this contact area affects current transmission, current flow area, and temperature rise. Therefore, while ensuring that the electrode tab 21 and the support platform 202 can form a connection, it is also necessary to ensure the contact area between them. When the width of the electrode core 20 is small, in order to form a larger area support platform 202, the second through hole 201 can be located at a non-central position in the width direction of the connecting terminal 200. For example, the second through hole 201 can be close to the edge of the connecting terminal 200. When the width of the electrode core 20 is large, in order to form a support platform 202 that meets the requirements, the second through hole 201 can be located at the center position or a non-central position in the width direction of the connecting terminal 200.

[0105] by Figure 2 Taking the coordinate system in the figure as an example, the X direction is the thickness direction of the pole core 20 and the Z direction is the length direction of the pole core 20.

[0106] The above describes the basic shape of the electrode 21. For more detailed design of the electrode 21, please refer to the following fourth type of embodiment.

[0107] Figure 3 A schematic diagram of a cover plate structure according to a first-type embodiment of this application is shown; Figure 4 An exploded view diagram is shown according to a first-type embodiment of this application; Figure 5 A cross-sectional view of a cover plate structure provided according to a first-type embodiment of this application is shown; Figure 6 Another cross-sectional view of a cover plate structure provided according to a first-type embodiment of this application is shown.

[0108] In the first type of embodiment, please refer to Figures 3 to 6The cover plate structure 30 includes a cover plate body 100, a connecting terminal 200, and an insulating structure 300.

[0109] 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 metals 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 first through hole 101 that communicates with the receiving cavity 11 of the housing 10.

[0110] The structure of the first through hole 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 first through hole 101 can be a long strip hole with a small opening. Of course, the first through hole 101 can also be a rectangular hole with a large opening.

[0111] The connection terminal 200 can be used as the positive or negative end in the cover plate structure 30. The connection terminal 200 can be disposed on the cover plate body 100. The connection terminal 200 has a second through hole 201 that communicates with the first through hole 101. The second through hole 201 can be a long strip hole or a rectangular hole.

[0112] It is understandable that after the tab 21 passes through the first through hole 101 and the second through hole 201, it can be connected to the connection terminal 200, so that current can be introduced from the tab 21 to the connection terminal 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 connection terminal 200.

[0113] The function of the insulating structure 300 is to form insulation between the cover plate body 100 and the connecting terminal 200. The insulating structure 300 can be designed according to the specific structure of the cover plate body 100 and the connecting terminal 200. As a general design principle, the insulating structure 300 needs to be able to separate the cover plate body 100 and the connecting terminal 200.

[0114] In some cases, the insulating structure 300 may surround the outer periphery of the connecting terminal 200. In other cases, the insulating structure 300 may be sandwiched between the cover plate body 100 and the connecting terminal 200. The design of the insulating structure 300 can be referred to the following embodiments.

[0115] The connecting terminal 200 has a support platform 202 formed on one side of the second through hole 201, so that the tab 21 can be connected to the support platform 202 after passing through the second through hole 201.

[0116] In this first embodiment, the cover plate structure 30 can be connected to the end of the housing 10. Based on the design of the first through hole 101, the cover plate structure 30 allows the tab 21 to pass through the first through hole 101 and reach the location of the connection terminal 200. Based on the design of the second through hole 201, the cover plate 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 outside 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 plate 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.

[0117] In some embodiments, please refer to Figures 3 to 6 The support platform 202 includes a support plane 202a, which enables surface contact between the tab 21 and the support platform 202, ensuring connection reliability and increasing the current flow area to prevent excessively rapid heating.

[0118] In some embodiments, please refer to Figures 3 to 6 The connection terminal 200 includes a terminal platform 210, which includes an outer edge structure portion 211 and an inner side structure portion 212.

[0119] 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.

[0120] 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.

[0121] In conjunction with the foregoing, the terminal platform 210 can adopt a rectangular structure, wherein the outer edge structure 211 can form a rectangular frame, and the inner side structure 212 can be connected to the frame.

[0122] In some embodiments, please refer to Figure 6 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.

[0123] 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.

[0124] 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 6 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.

[0125] In some embodiments, please refer to Figure 6 The second sidewall 2113 includes a first side 2113a and a second side 2113b, the first side 2113a and the second side 2113b being disposed opposite to each other, and the inner structural portion 212 being connected to at least one of the first side 2113a and the second side 2113b.

[0126] In conjunction with the foregoing, the first side 2113a and the second side 2113b can be the two long sides of the outer edge structure 211. To form the second through hole 201, the inner structure 212 can be connected to the first side 2113a, or it can be connected to the second side 2113b, or the inner structure 212 can be connected to both the first side 2113a and the second side 2113b.

[0127] For example, in some specific embodiments, please refer to Figure 6 The inner structural part 212 is connected to the first side 2113a and extends to the second side 2113b. The inner structural part 212 and the second side 2113b form a second through hole 201, which can be an elongated hole.

[0128] For example, in some other specific embodiments, the inner structural portion 212 is connected to the second side 2113b and extends to the first side 2113a. The inner structural portion 212 and the first side 2113a form a second through hole 201, which can be an elongated hole.

[0129] For example, in some other specific embodiments, the inner structural portion 212 may include a first structural portion and a second structural portion. The first structural portion is connected to the first side 2113a and extends to the second side 2113b, and the second structural portion is connected to the second side 2113b and extends to the first side 2113a. The first structural portion and the second structural portion form a second through hole 201, which may be an elongated hole.

[0130] In some embodiments, please refer to Figures 3 to 6 The connection terminal 200 also includes a cover 220, which covers the support platform 202.

[0131] 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.

[0132] 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 connection terminal 200, and then from the connection terminal 200 to the cover 220.

[0133] In some specific embodiments, please refer to Figure 6 The terminal platform 210 has a first step 210a, which can be specifically located at the junction of the top wall 2111 and the second side wall 2113. The cover 220 is located on the first step 210a.

[0134] To ensure uniformity in appearance, after the cover 220 is installed on the first step 210a, the surface of the cover 220 can be flush with the surface of the top wall 2111.

[0135] For this purpose, a lug 221 can be formed on each side of the cover 220. The thickness of the lug 221 is the same as the depth of the first step 210a. After the lug 221 and the first step 210a are engaged, the connection is reliable, and a tight fit can be formed between the cover 220 and the connection terminal 200.

[0136] In some more specific embodiments, a sealing ring or other structure may be provided between the cover 220 and the terminal platform 210. For example, the sealing ring may be provided between the aforementioned lug 221 and the first step 210a.

[0137] In some embodiments, please refer to Figures 3 to 6 The insulating structure 300 includes an insulating ring 310 along the thickness direction of the cover plate structure 30, which is also the length direction of the pole core 20. Figure 4 (in the Z direction), the insulating ring 310 is disposed between the first side wall 2112 and the cover plate body 100.

[0138] The insulating ring 310 forms insulation between the cover plate body 100 and the connecting terminal 200 in an enclosing manner. The insulating ring 310 is made of materials with insulating properties such as ceramic or plastic. The first sidewall 2112 abuts against one side of the insulating ring 310, and the cover plate body 100 abuts against the other side of the insulating ring 310. Thus, the insulating ring 310 can separate the cover plate body 100 and the connecting terminal 200, thereby playing an insulating role.

[0139] In some embodiments, please refer to Figure 6 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 thickness of the insulating ring 310 is the difference between the dimensions of the second sidewall 2113 and the first sidewall 2112.

[0140] By designing the dimensions of the first sidewall 2112 and the second sidewall 2113, the insulating ring 310 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 connecting terminal 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.

[0141] In some embodiments, please refer to Figure 6 To improve the insulation effect, the insulating ring 310 and the second sidewall 2113 can be separated, for example, a gap can be formed between them.

[0142] This further separates the cover plate structure 30 from the connecting terminal 200, thereby improving insulation performance.

[0143] In some specific embodiments, an insulating filler, such as rubber or foam, can be filled into the gap to further improve the insulation performance between the cover structure 30 and the connecting terminal 200.

[0144] In some embodiments, please refer to Figure 6 An edge step 102 is formed on the outer edge of the cover body 100 for connecting with the battery casing 10.

[0145] The edge step 102 has a first mating surface 1021 and a second mating surface 1022. The first mating surface 1021 can be located in a horizontal plane, and the second mating surface 1022 can be located in a vertical plane. After the cover plate structure 30 is installed on the housing 10, the first mating surface 1021 can form a mating with the end face of the housing 10, and the second mating surface 1022 can form a mating with the inner surface of the housing 10, thereby facilitating the formation of a sealed connection between the cover plate structure 30 and the housing 10.

[0146] In some embodiments, please refer to Figures 3 to 6 The cover plate structure 30 also includes a support 400, which is disposed on the cover plate body 100. The support 400 can be connected between the connecting terminal 200 and the cover plate body 100. The support 400 is used to support the connecting terminal 200 away from the cover plate body 100.

[0147] In conjunction with the foregoing, when the support 400 is provided, the support 400 can abut against the aforementioned insulating ring 310. The support 400 is located between the cover plate body 100 and the insulating ring 310. By providing the support 400, the connecting terminal 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 connecting terminal 200.

[0148] In some embodiments, please refer to Figure 6 The support 400 includes a connecting part 410 and a supporting part 420. The supporting part 420 is connected to the connecting part 410. The connecting part 410 is disposed on the cover plate body 100. The supporting part 420 is used to support the insulating ring 310.

[0149] The support 400 can be made of metal and can be connected to the cover plate body 100 by laser welding.

[0150] To improve the connection reliability between the support 400 and the cover plate body 100, the structure of the support 400 can be designed, and the cover plate body 100 can also be designed accordingly.

[0151] For example, in Figure 6 In the example shown, the connecting portion 410 includes a first connecting portion 411 and a second connecting portion 412. The first connecting portion 411 is disposed on the cover body 100, and the second connecting portion 412 extends from the first connecting portion 411 toward the connecting terminal 200.

[0152] Specifically, it can be combined with Figure 4As shown in the diagram, the first connecting part 411 is located in the plane formed by XY, and the second connecting part 412 is located in the plane formed by YZ.

[0153] For example, in Figure 6 In the example shown, a support groove 103 is formed on the cover plate body 100, and the first connecting part 411 is disposed in the support groove 103.

[0154] The support groove 103 can limit the support 400, so that the support 400 can be stably connected to the cover plate body 100.

[0155] In some embodiments, please refer to Figures 3 to 6 The cover plate 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 first through hole 101 and can cover the hole wall of the first through hole 101 circumferentially. For example, the insulating frame 500 surrounds the inner wall of the first through hole 101 of the cover plate body 100 circumferentially.

[0156] As mentioned above, the tab 21 needs to pass through the first through hole 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.

[0157] In some specific embodiments, please refer to Figure 6 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 first through hole 101 and can be attached to the inner wall of the first through hole 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.

[0158] 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.

[0159] In some embodiments, please refer to Figure 5 The insulating frame 500 is constructed to have a cavity, in which a reinforcing rib 530 is provided, thereby improving the structural strength of the insulating frame 500 and thus enhancing the limiting effect of the insulating frame 500 on the pole core 20.

[0160] To gain a clearer understanding of the structural composition of the battery and cover plate structure 30 in the first embodiment, the following will be combined with... Figure 6 To provide further details, the various components mentioned in the following description have been introduced above. The following description will mainly explain the assembly of the battery and cover structure 30 through these components.

[0161] exist Figure 6 In the example shown, the battery includes a casing 10, an electrode core 20, and a cover structure 30. The cover structure 30 includes a cover body 100, a connecting terminal 200, an insulating structure 300, and a support 400. The connecting terminal 200 includes a terminal platform 210 and a cover 220. The insulating structure 300 uses an insulating ring 310. The cover structure 30 has a first through hole 101, the connecting terminal 200 has a second through hole 201, and a support platform 202 is formed on one side of the second through hole 201.

[0162] The assembly of the cover plate structure 30 can be carried out in the following manner: the support 400 and the cover plate body 100 are connected into one piece by laser welding, the insulating ring 310 is connected to the support 400 and the terminal platform 210 by brazing, and finally the cover 220 is connected to the terminal platform 210 by laser welding.

[0163] The battery can be assembled as follows: except for the cover 220, the rest of the cover structure 30 is assembled as one piece. After the tab 21 passes through the first through hole 101 and the second through hole 201, the bent part 21b of the tab 21 is welded to the support platform 202. Finally, the cover 220 is connected to the terminal platform 210 by laser welding.

[0164] Figure 7 An exploded schematic diagram of a battery according to a second type embodiment of this application is shown; Figure 8 It shows Figure 7 A magnified view of part A in the middle; Figure 9 A schematic diagram of an insulating frame according to a second type embodiment of this application is shown; Figure 10 It shows Figure 9 A magnified view of part B in the middle; Figure 11 A partial cross-sectional view of a battery provided according to a second type embodiment of this application is shown.

[0165] In the second type of embodiment, please refer to Figure 7 , Figure 8 and Figure 11 The battery includes a casing 10, an electrode core 20, a cover structure 30, and an insulating film 600.

[0166] The housing 10 and the electrode core 20 have been described in detail in the aforementioned first type of embodiment, and will not be repeated here.

[0167] Unlike the first type of embodiment described above, in this second type of embodiment, the insulating film 600 can cover the outside of the electrode core 20, forming an insulating barrier around the electrode core 20 and improving the insulation performance between the electrode core 20 and the surrounding structure.

[0168] In the second embodiment, 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 circuit problems caused by welding slag entering the battery, improve the safety performance of the battery, and reduce the internal space of the battery 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, thereby increasing the battery capacity.

[0169] In addition, in this second type of embodiment, the cover plate structure 30 is designed differently from the first type of embodiment, with the main difference being in the specific structure of the insulating frame 500.

[0170] In this second embodiment, the insulating frame 500 can form a more stable connection with the cover plate body 100, thereby improving the connection strength of the cover plate structure 30.

[0171] In this second embodiment, the cover plate structure 30 can be connected to the end of the housing 10. Based on the design of the first through hole 101, the cover plate structure 30 allows the tab 21 to pass through the first through hole 101 and reach the location of the connection terminal 200. Based on the design of the second through hole 201, the cover plate 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 outside 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 plate structure 30 and the electrode core 20, providing more space for the electrode core 20 and thus increasing battery capacity. Furthermore, the support platform 202 can support the tab 21, preventing short circuits caused by compression. The tab 21 can maintain its basic function without multiple bends. In this embodiment, the tab 21 can be designed to be shorter and requires only one bend, reducing the manufacturing cost and simplifying the manufacturing process of lithium-ion batteries. Additionally, the structural strength of the cover structure 30 is improved based on the structural design of the insulating frame 500.

[0172] In the second type of embodiment, please refer to Figures 7 to 11 The cover plate structure 30 includes a cover plate body 100 and an insulating frame 500. The insulating frame 500 is provided with a snap-fit ​​structure 550. The snap-fit ​​structure 550 in the insulating frame 500 is used at least to engage and fix the cover plate body 100 and the insulating frame 500. In other words, the snap-fit ​​structure 550 in the insulating frame 500 can be used solely for engaging and fixing the cover plate body 100 and the insulating frame 500, or it can also be used for engaging and fixing the cover plate body 100, the insulating frame 500, and other structures (such as the support 400). For example, a snap-fit ​​groove is formed between the snap-fit ​​structure 550 and the insulating frame body 540, and the cover plate body 100 is engaged within the snap-fit ​​groove.

[0173] In this second type of embodiment, a support 400 may also be provided, which is disposed on the cover plate body 100, and the snap-fit ​​structure 550 can snap the cover plate body 100 and the support 400 onto the insulating frame 500.

[0174] Therefore, it can be seen that, based on the setting of its snap-fit ​​structure 550, the cover plate body 100 or the cover plate body 100 and the support 400 can be snapped onto the insulation frame 500 in the second embodiment, thereby improving the connection strength between the cover plate body 100 and the insulation frame 500.

[0175] Other components of the cover plate structure 30, such as the cover plate body 100, the connecting terminal 200, the insulating structure 300, and the support 400, can be designed according to the aforementioned first type of embodiment.

[0176] In some embodiments, please refer to Figures 9 to 11 The insulating frame 500 includes an insulating frame body 540 and a snap-fit ​​structure 550. The snap-fit ​​structure 550 is disposed on the insulating frame body 540 and is used at least to snap and fix the cover plate body 100 of the cover plate structure 30 and the insulating frame body 540.

[0177] As can be seen from the above-mentioned first type of embodiment, the insulating frame 500 can form insulation between the cover plate body 100 and the tab 21. The insulating frame 500 is disposed on the side of the cover plate body 100 facing the first through hole 101. The buckle structure 550 here can improve the connection strength between the cover plate body 100 and the insulating frame 500, prevent the insulating frame 500 from detaching from the cover plate body 100, and improve the structural strength of the cover plate structure 30 while ensuring insulation performance, thereby improving the safety performance of the battery.

[0178] In some embodiments, please refer to Figures 9 to 11The snap-fit ​​structure 550 includes a hook 551, which is connected to the insulating frame body 540. The hook 551 can pass through the first through hole 101 and abut against the side of the support 400 opposite to the cover plate body 100 along the thickness direction (i.e., Z direction) of the cover plate structure 30.

[0179] Please refer to Figure 9 and Figure 11 The hook 551 can abut against the cover body 100 from top to bottom, thereby restricting the cover body 100 to the insulating frame body 540.

[0180] As mentioned above, the insulating frame 500 can be designed as a rectangular structure, and the cover plate body 100 can also be designed as a rectangular structure. To ensure the reliability of the connection between the two, the hooks 551 can be arranged at intervals along the circumference on the insulating frame body 540.

[0181] In some embodiments, please refer to Figures 9 to 11 The hook 551 includes an arc portion 5511 and a barb portion 5512. The arc portion 5511 can be connected between the insulating frame body 540 and the barb portion 5512. The barb portion 5512 abuts against the support 400 along the thickness direction (i.e., the Z direction) of the cover plate structure 30.

[0182] It is understandable that the barb portion 5512 is a structure that directly acts on the support 400 and the cover plate body 100. By setting the arc portion 5511 between the barb portion 5512 and the insulating frame body 540, the arc transition between the insulating frame body 540 and the barb portion 5512 can be achieved, which can improve the structural strength of the hook 551.

[0183] In some embodiments, please refer to Figure 9 and Figure 10 An air-blocking groove 541 is formed on the insulating frame body 540, and a snap-fit ​​structure 550 is disposed in the air-blocking groove 541.

[0184] The design of the clearance groove 541 allows a groove to be formed between the snap-fit ​​structure 550 and the insulating frame body 540. The periphery of the snap-fit ​​structure 550 is not confined by the insulating frame body 540, which can improve the deformation capacity of the snap-fit ​​structure 550 and make it easier for the snap-fit ​​structure 550 to be snapped onto the support 400 and the cover plate body 100.

[0185] In some embodiments, please refer to Figure 9 and Figure 10 The buckle structure 550 also includes a hook post 552, which is disposed in the clearance groove 541. The aforementioned hook 551 can be connected to the hook post 552. Specifically, the arc portion of the hook 551 can be connected to the hook post 552.

[0186] The hook post 552 is installed in the clearance groove 541, which releases the space for movement of the hook post 552. By applying force to the hook post 552, it can be deformed, which facilitates the connection of the support 400 and the cover plate body 100 to the insulation frame body 540 through deformation, and also facilitates the engagement of the support 400 and the cover plate body 100 onto the insulation frame body 540 through resetting.

[0187] In some embodiments, please refer to Figures 9 to 11 The buckle structure 550 includes a first buckle group 550a and a second buckle group 550b that are spaced apart along the length direction.

[0188] This length direction can be combined Figure 9 Interpret the directions shown. Figure 9 The Y direction in the equation defines the length direction.

[0189] In the above embodiment, by setting the first buckle group 550a and the second buckle group 550b along the length direction, the problem of unreliable fastening caused by the length problem can be balanced. By setting the first buckle group 550a and the second buckle group 550b, a stable connection between the insulating frame 500 and the cover plate body 100 can be achieved even if the length of the cover plate body 100 is relatively long.

[0190] Specifically, the first latch group 550a and the second latch group 550b can be disposed at both ends of the insulation frame body 540 along its length.

[0191] It is understandable that the distance between the first latch group 550a and the second latch group 550b should be adapted to the length dimension of the pole core 20.

[0192] In some embodiments, the first buckle group 550a includes a first buckle 550a1 and a second buckle spaced apart along the width direction, and the second buckle group 550b includes a third buckle 550b1 and a fourth buckle 550b2 spaced apart along the width direction.

[0193] This width direction can be combined Figure 9 Interpret the directions shown. Figure 9 The X direction in the figure defines the width direction.

[0194] Understandably, the distance between the first buckle 550a1 and the second buckle needs to be designed reasonably so that the first buckle 550a1 and the second buckle can engage with the cover body 100 (or support 400) in the width direction. Similarly, the distance between the third buckle 550b1 and the fourth buckle 550b2 needs to be designed reasonably so that the third buckle 550b1 and the fourth buckle 550b2 can engage with the cover body 100 (or support 400) in the width direction.

[0195] In some embodiments, please refer to Figures 9 to 11 The insulating frame body 540 includes an insulating plate 542 and an insulating ring 543. The insulating plate 542 and the cover plate body 100 are stacked together along the thickness direction of the cover plate structure 30. The insulating ring 543 is disposed on the insulating plate 542. The snap-fit ​​structure 550 is connected to the insulating ring 543. The insulating ring 543 is located inside the first through hole 101.

[0196] In conjunction with the relevant content of the aforementioned first type of embodiment, the insulating plate 542 can form the stop portion 510 of the insulating frame 500, and the insulating ring 543 can form the insulating portion 520 of the insulating frame 500.

[0197] In some embodiments, please refer to Figures 9 to 11 The insulating plate 542 forms a recessed area 544 around the insulating ring 543.

[0198] Based on the foregoing, it can be understood that in the embodiment where the support 400 is provided, the support 400 can be connected to the cover plate body 100 by laser welding. To compensate for the increased thickness of the support 400 and the cover plate body 100 caused by welding, and to facilitate the accurate engagement of the snap-fit ​​structure 550 with the support 400, the distance between the snap-fit ​​structure 550 and the insulating frame body 540 can be increased. The recessed area 544 can achieve this purpose.

[0199] Specifically, you can refer to Figure 9 and Figure 11 The first connecting part 411 of the support 400 is welded to the cover plate body 100. After the welding is completed, the overall thickness of the first connecting part 411 and the cover plate body 100 is increased due to the presence of the weld. To compensate for the increase in thickness, the cover plate body 100 and the support 400 can be set in the aforementioned sunken area 544.

[0200] The assembly method of the battery and cover structure 30 in the second type of embodiment can refer to the aforementioned first type of embodiment, and will not be repeated here.

[0201] Figure 12 An exploded schematic diagram of a battery according to a third-class embodiment of this application is shown; Figure 13 It shows Figure 12 A magnified view of a portion of C in the image; Figure 14 A schematic diagram of an insulation structure provided according to a third type of embodiment of this application is shown; Figure 15 A partial cross-sectional view of a battery provided according to a third type embodiment of this application is shown.

[0202] In the third type of embodiment, please refer to Figures 12 to 15The battery includes a casing 10, an electrode core 20, a cover structure 30, and an insulating film 600.

[0203] The housing 10 and the electrode core 20 have been described in detail in the aforementioned first type of embodiment, and will not be repeated here.

[0204] The insulating film 600 has been described in detail in the aforementioned second type of embodiment, and will not be repeated here.

[0205] In the third embodiment, 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 circuit problems caused by welding slag entering the battery, improve the safety performance of the battery, and reduce 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, thereby increasing the battery capacity.

[0206] In this third type of embodiment, the cover plate structure 30 is also designed differently from the first type of embodiment. The main difference lies in the specific structure of the insulation structure 300.

[0207] In this third embodiment, the insulation performance of the insulation structure 300 can be further improved.

[0208] In the third type of embodiment, please refer to Figures 12 to 15 The insulating structure 300 may be an insulating ring 310, and the specific structure of the insulating ring 310 is different from the first type of embodiment described above.

[0209] In this third embodiment, the insulating ring 310 includes a first mating surface 3111 and a second mating surface 3112, at least one of the first mating surface 3111 and the second mating surface 3112 including a groove 3113, which can be used to realize the connection between the insulating ring 310 and the connecting terminal 200 and / or the cover plate body 100. For example, the groove 3113 on the first mating surface 3111 (i.e., the first groove below) connects the insulating ring 310 and the connecting terminal 200. Optionally, the connecting terminal 200 can be directly inserted into the groove 3113, or it can be inserted into the groove 3113 through an intermediate structural member (not shown in the figure) connected to the connecting terminal 200. Correspondingly, the groove 3113 on the second mating surface 3112 (i.e., the second groove below) connects the insulating ring 310 and the cover plate body 100. Optionally, the cover plate body 100 can be directly inserted into the groove 3113, or it can be inserted into the groove 3113 through an intermediate member (such as a support 400) connected to the cover plate body 100.

[0210] As described above, the first mating surface 3111 can be connected to the connecting terminal 200, and the second mating surface 3112 can be connected to the cover plate body 100 (or support 400). The insulating ring 310 is made of insulating material, and both the connecting terminal 200 and the cover plate body 100 can be made of metal. The insulating ring 310, the connecting terminal 200, and the cover plate body 100 can be connected by brazing. By forming grooves 3113 on the first mating surface 3111 and / or the second mating surface 3112, it is possible to prevent solder from overflowing from the surface of the insulating ring 310 and causing a short circuit between the connecting terminal 200 and the cover plate body 100, thereby preventing insulation failure and improving the insulation performance of the insulating ring 310.

[0211] In some embodiments, please refer to Figure 14 The depth of the groove 3113 is 0.1mm to 0.5mm, which increases the space for the solder to be contained while ensuring the connection strength, and can prevent the solder from overflowing from the groove 3113.

[0212] In some embodiments, a first groove is formed on the first mating surface 3111 and a second groove is formed on the second mating surface 3112. Both the first groove and the second groove constitute a groove 3113, which can improve the connection strength between the insulating ring 310, the connecting terminal 200 and the cover plate body 100, while preventing solder from overflowing.

[0213] In some specific embodiments, please refer to Figure 14 The outer contour of the cross-section of the insulating ring 310 can be square or rectangular.

[0214] In this second type of embodiment, please refer to Figures 12 to 15 The cover plate structure 30 may include a cover plate body 100, a connecting terminal 200, and an insulating ring 310.

[0215] The cover plate body 100 and the connecting terminal 200 can be designed with reference to the first type of embodiment.

[0216] An insulating ring 310 is disposed between the cover plate body 100 and the connecting terminal 200 to form insulation between the cover plate body 100 and the connecting terminal 200. At least a portion of the connecting terminal 200 is engaged in the groove 3113, and / or at least a portion of the cover plate body 100 is engaged in the groove 3113.

[0217] In this third embodiment, the cover plate structure 30 can be connected to the end of the housing 10. Based on the design of the first through hole 101, the cover plate structure 30 allows the tab 21 to pass through the first through hole 101 and reach the location of the connection terminal 200. Based on the design of the second through hole 201, the cover plate 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 outside 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 circuit problems caused by welding slag entering the battery, improving battery safety performance. This external welding method can also reduce 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, the support platform 202 can support the tab 21, preventing short circuits caused by compression. The tab 21 can maintain its basic function without multiple bends. In this embodiment, the tab 21 can be designed to be shorter and requires only one bend, reducing the manufacturing cost and simplifying the manufacturing process of lithium-ion batteries. Additionally, based on the structural design of the insulating ring 310, the insulation performance between the connecting terminal 200 and the cover body 100 in the cover structure 30 is improved.

[0218] The insulating ring 310 in the cover structure 30 may include a first groove and a second groove, with the connecting terminal 200 snapping into the first groove and the support 400 snapping into the second groove.

[0219] In conjunction with the first type of embodiment described above, the connecting terminal 200 includes a first sidewall 2112 that can be snapped into the groove 3113, the thickness of which is 0.4mm to 0.8mm.

[0220] It is understood that the thickness of the first sidewall 2112 is its dimension along the X direction. By designing this dimension as described above, the connection strength between the first sidewall 2112 and the insulating ring 310 can be improved while ensuring sufficient structural strength of the first sidewall 2112. Specifically, during brazing, the first sidewall 2112 of the above dimensions can undergo slight deformation, thereby absorbing the internal stress generated during brazing.

[0221] In this third type of embodiment, the cover plate structure 30 may also include a support 400, the structure of which can be designed with reference to the aforementioned first type of embodiment.

[0222] To improve the connection strength between the support 400 and the insulating ring 310, the dimensions of the support 400 can be designed. For example, in some embodiments, the thickness of the supporting portion 420 and the first connecting portion 411 of the support 400 is 0.4 mm to 0.8 mm, and the thickness of the second connecting portion 412 is 0.3 mm to 0.6 mm.

[0223] It should be noted that the thickness of the supporting portion 420 is the dimension of the supporting portion 214 along the Z direction, the thickness of the first connecting portion 411 is the dimension along the Z direction, and the thickness of the second connecting portion 412 is the dimension along the X direction. By designing these dimensions as described above, the connection strength between the first support 400 and the insulating ring 310 can be improved while ensuring that the support 400 has sufficient structural strength. Specifically, during brazing, the support 400 with the above-mentioned dimensions can undergo slight deformation, thereby absorbing the internal stress formed during brazing.

[0224] In the fourth type of embodiment, the specific structure of the tab 21 is mainly described. The fourth type of embodiment can be understood with reference to the accompanying drawings in the first type of embodiment.

[0225] In the fourth type of embodiment, reference can be made to Figure 1 and Figure 2 The battery may include a casing 10, an electrode core 20, and a cover structure 30.

[0226] The specific structural composition of the housing 10, the pole core 20, and the cover plate structure 30 can be understood by referring to the relevant content in the aforementioned first type of embodiment.

[0227] In this fourth type of embodiment, the various functions of the battery and cover structure 30 are the same as those in the first type of embodiment described above, and will not be repeated here.

[0228] In some embodiments, please refer to Figure 1 and Figure 2 The electrode tab 21 includes a raised portion 21a and a bent portion 21b. The raised portion 21a extends along its width direction (i.e., the thickness direction of the electrode core 20). Figure 2 A first end 21a1 and a second end 21a2 are formed in the X direction. A raised portion 21a forms a protruding end 21a3 between the first end 21a1 and the second end 21a2. This protruding end 21a3 is along the width direction (i.e., the thickness direction of the pole core 20). Figure 2 The distance between the center of the protruding end 21a3 in the X direction and the first end 21a1 is greater than or equal to the distance between the center of the protruding end 21a3 in the width direction and the second end 21a2. The bent portion 21b is connected to the protruding end 21a3 and bends toward the first end 21a1.

[0229] The aforementioned tab 21 has a first end 21a1 and a second end 21a2, which are the two boundaries in the width direction of the raised portion 21a, and a convex portion, which is a reference point located in the middle of the raised portion 21a. It is understood that the position of the convex end 21a3 affects the overall strength of the tab 21. The stress in the tab 21 between the convex end 21a3 and the first end 21a1 will be greater than the stress in the tab 21 between the convex end 21a3 and the second end 21a2. To balance this unequal stress relationship, the bent portion 21b can be bent towards the first end 21a1.

[0230] In this embodiment, bending the tab 21 toward the first end 21a1 can balance the internal stress of the tab 21, and at the same time increase the size of the bent portion 21b to increase the contact area between the bent portion 21b and the support platform 202, which is beneficial to improving the connection strength between the tab 21 and the support platform 202.

[0231] In some embodiments, please refer to Figure 2 The width of the raised portion 21a is L1, the width of the bent portion 21b is L2, and the distance between the first end 21a1 and the protruding end 21a3 is L3. L1, L2, and L3 satisfy the following relationship:

[0232] L1*1 / 2≤L3<L1, 3mm<L2<L3.

[0233] It should be noted that, generally speaking, the width L1 of the gathered portion 21a is the same as the width of the pole core 20, i.e., L1 = L. In the above embodiment, by designing the dimensions of L1, L2, and L3, the width of the bent portion 21b can be guaranteed, thereby improving the connection strength between the bent portion 21b and the support platform 202.

[0234] In some embodiments, please refer to Figure 2 When L1≥25mm, L1 and L3 satisfy the relationship: L1*1 / 2≤L3<0.9L1. When L1<25mm, L1 and L3 satisfy the relationship: L*1 / 2<L3<L1.

[0235] The above relationship is mainly based on the width of the pole core 20 to design the dimensions of L1, L2 and L3. It can set a reasonable width of the bending part 21b according to the width of the pole core 20 of different sizes, and can ensure the connection strength between the bending part 21b and the support platform 202.

[0236] Figure 16 A partial cross-sectional view of a battery provided according to a fifth-class embodiment of this application is shown; Figure 17 An exploded view of a cover plate structure provided according to a fifth embodiment of this application is shown.

[0237] In this fifth type of embodiment, please refer to Figure 16 and Figure 17 The battery includes a casing 10, an electrode core 20, and a cover structure 30.

[0238] 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.

[0239] 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.

[0240] The electrode core 20 can be designed with reference to the first type of embodiment described above, and will not be described again. The electrode core 20 includes an electrode tab 21, and the specific structure of the electrode tab 21 can be designed with reference to the aforementioned embodiment. For example, the electrode tab 21 may include a raised portion 21a and a bent portion 21b.

[0241] You can refer to this. Figure 16 The cover plate structure 30 may include a cover plate body 100 and a connecting terminal 200, wherein the electrode tab 21 needs to be connected to the connecting terminal 200. For this purpose, a first through hole 101 is provided on the cover plate body 100, the connecting terminal 200 is located on the side of the cover plate body 100 opposite to the electrode core 20, the connecting terminal 200 forms a support platform 202, and the connecting terminal 200 includes a second through hole 201 penetrating the support platform 202, and the second through hole 201 communicates with the first through hole 101. The first through hole 101 and the second through hole 201 are adapted for the electrode tab 21 to pass through, so that the electrode tab 21 is connected to the side of the support platform 202 opposite to the electrode core 20.

[0242] In this fifth embodiment, the cover structure 30 can be connected to the end of the housing 10. Based on the design of the first through hole 101 on the cover body 100 and the design of the second through hole 201 on the connecting terminal 200, the cover structure 30 allows the tab 21 to reach the side of the support platform 202 away from the electrode core 20 after passing through the first through hole 101 and the second through hole 201. This allows the tab 21 in the battery to extend out of the housing 10 and connect to the side of the support platform 202 away from the electrode core 20. This structure allows the connection between the tab 21 and the connecting terminal 200 to be made outside the housing. For example, when welding is used, it can avoid short circuit problems caused by welding slag entering the battery, which can improve the safety performance of the battery. At the same time, it can save the internal space of the battery occupied by the connecting structure, providing more space for the electrode core 20, thereby increasing the 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.

[0243] Unlike the first type of embodiment described above, the cover plate structure 30 in this fifth type of embodiment can be sandwiched to form insulation between the cover plate body 100 and the connecting terminal 200.

[0244] Please refer to Figure 16 and Figure 17 The cover plate structure 30 includes a cover plate body 100, a connecting terminal 200, and an insulating structure 300.

[0245] 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 metals 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 first through hole 101 that communicates with the receiving cavity 11 of the housing 10.

[0246] The structure of the first through hole 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 first through hole 101 can be a long strip hole with a small opening. Of course, the first through hole 101 can also be a rectangular hole with a large opening.

[0247] The connection terminal 200 has a second through hole 201 that communicates with the first through hole 101. The second through hole 201 can be a long strip hole or a rectangular hole.

[0248] It is understandable that after the tab 21 passes through the first through hole 101 and the second through hole 201, it can be connected to the connection terminal 200, so that current can be conducted from the tab 21 to the connection terminal 200. In order to improve the safety of battery use and prevent current from being conducted into the cover body 100, insulation needs to be formed between the cover body 100 and the connection terminal 200.

[0249] In this fifth type of embodiment, the insulating structure 300 is disposed between the cover plate body 100 and the connecting terminal 200 to form insulation between the cover plate body 100 and the connecting terminal 200. The insulating structure 300 also covers the inner wall of the first through hole 101. At least a portion of the insulating structure 300 is injection molded onto the cover plate body 100.

[0250] The insulation structure 300 formed between the cover plate body 100 and the connecting terminal 200 can form insulation between the two to ensure safety. At least part of the insulation structure 300 can be injection molded on the cover plate body 100, which can improve the connection strength and simplify the manufacturing process.

[0251] Understandably, the insulating structure 300 covering the cover body 100 is sandwiched between the connecting terminal 200 and the cover body 100, and can separate the connecting terminal 200 and the cover body 100, thereby forming insulation between the two.

[0252] The connecting terminal 200 also has a support platform 202 formed on one side of the second through hole 201, so that the tab 21 can be connected to the support platform 202 after passing through the second through hole 201.

[0253] In some embodiments, the support platform 202 includes a support plane 202a, which is adapted to be attached to and welded to the tab 21. This allows for surface contact between the tab 21 and the support platform 202, ensuring reliable connection and increasing the current flow area to prevent excessively rapid temperature rise. The structure of the support platform 202 and the support plane 202a can be referred to in the aforementioned first-type embodiment.

[0254] In some embodiments, please refer to Figure 16 and Figure 17 The connection terminal 200 includes a terminal platform 210, which includes a base 213. The base 213 has a second through hole 201, and at least a portion of the structure of the base 213 forms a support platform 202.

[0255] The seat 213 can be installed on the cover plate body 100. The insulating structure 300 is located between the seat 213 and the cover plate body 100. The seat 213 is provided with a second through hole 201 that communicates with the first through hole 101. Both the first through hole 101 and the second through hole 201 can be elongated holes.

[0256] The base 213 forms a support platform 202, and the electrode tab 21 can be connected to the side of the base 213 away from the electrode core 20 after passing through the second through hole 201.

[0257] In some embodiments, please refer to Figure 16 and Figure 17 The terminal platform 210 also includes a support portion 214, which protrudes from the base body 213. The portion of the base body 213 located inside the support portion 214 forms a support platform 202. The connecting terminal 200 also includes a cover 220, which is disposed on the support portion 214 and opened above the base body 213.

[0258] As mentioned above, the tab 21 can be connected to the side of the base 213 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.

[0259] The support portion 214 can protrude from both sides of the base 213 in the width direction. The support portion 214 can protrude to a certain height, so that after the cover 220 is assembled onto the support portion 214, a space for accommodating the tab 21 can be formed between the cover 220 and the support platform 202.

[0260] In some embodiments, the cover may also be disposed within the space defined by the support 214 and the base 213.

[0261] In some specific embodiments, please refer to Figure 16 and Figure 17 A first step 210a is formed on the support portion 214 (refer to the first type of embodiment), and the cover 220 is disposed on the first step 210a.

[0262] To ensure uniformity in appearance, after the cover 220 is installed on the first step 210a, the surface of the cover 220 can be flush with the surface of the top wall 2111.

[0263] For this purpose, a lug 221 can be formed on each side of the cover 220. The thickness of the lug 221 is the same as the depth of the first step 210a. After the lug 221 and the first step 210a are engaged, the connection is reliable, and a tight fit can be formed between the cover 220 and the connection terminal 200.

[0264] In some more specific embodiments, a sealing ring or other structure may be provided between the cover 220 and the terminal platform 210. For example, the sealing ring may be provided between the aforementioned lug 221 and the first step 210a.

[0265] In some embodiments, please refer to Figure 16 and Figure 17 The cover 220 includes a metal composite component, which may be a copper-aluminum composite block, etc. The copper-aluminum composite block is an assembly of copper and aluminum materials. Depending on the materials used in the tab 21, the copper-aluminum composite block may adopt different material combinations and structural combinations.

[0266] For example, in Figure 16 and Figure 17 In the example shown, the tab 21 can be a negative tab, which is usually made of copper. To ensure the effect of current transmission, the copper-aluminum composite block can include a copper block portion 222 and an aluminum block portion 223, wherein the copper block portion 222 can be connected to the support portion 214.

[0267] In other instances, for example, when tab 21 is a positive tab, the positive tab is usually made of aluminum. To ensure the effectiveness of current transmission, the aluminum block portion 223 in the copper-aluminum composite block can be connected to the support portion 214.

[0268] In addition, to ensure the current transmission effect between the tab 21 and the base 213, the material of the base 213 can be set according to the different tabs 21. For example, when the tab 21 is a negative tab, the base 213 can be made of copper, and when the tab 21 is a positive tab, the base 213 can be made of aluminum.

[0269] In some embodiments, reference may be made to Figure 16 and Figure 17 The insulating structure 300 includes an insulating layer 320, which is sandwiched between the connecting terminal 200 and the cover plate body 100.

[0270] The insulating layer 320 can be a single-layer structure or a multi-layer structure. The insulating layer 320 can be laid flat between the terminal platform 210 and the cover plate body 100. The multi-layer insulating layer 320 design can further improve the overall insulation performance.

[0271] In some embodiments, please refer to Figure 16 and Figure 17 The insulation structure 300 may also adopt an encapsulated structure to improve insulation performance. The insulation structure 300 may include a first insulating element 330 and a second insulating element 340. The first insulating element 330 covers at least the periphery of the first through hole 101. The second insulating element 340 abuts against the first insulating element 330 and is located between the connecting terminal 200 and the cover plate body 100. The first insulating element 330 and / or the second insulating element 340 are injection molded onto the cover plate body 100.

[0272] The first insulating element 330, by covering the periphery of the first through hole 101, provides insulation in two ways: one between the terminal platform 210 and the cover plate body 100, and the other between the cover plate body 100 and the electrode tab 21. For the latter, it prevents the electrode tab 21 from contacting the cover plate body 100 as it passes through the first through hole 101. Injection molding can enhance the connection strength between the insulating structure 300 and the cover plate body 100.

[0273] It is understandable that for the first insulating member 330, a portion is sandwiched between the connecting terminal 200 and the cover plate body 100, and another portion is located between the cover plate body 100 and the electrode 21. For the portion sandwiched between the terminal platform 210 and the cover plate body 100, this portion can form an insulating layer 320 located between the connecting terminal 200 and the cover plate body 100 together with the second insulating member 340.

[0274] The first insulating member 330 can be connected to the cover plate body 100 in a tight fit manner. Specifically, the cover plate body 100 includes a first surface 104 facing the connection terminal 200, a second surface 105 facing away from the connection terminal 200, and a third surface 106 connecting the first surface 104 and the second surface 105. The first insulating member 330 includes a first bonding portion 331 attached to the first surface 104, a second bonding portion 332 attached to the second surface 105, and a third bonding portion 333 attached to the third surface 106. The second insulating member 340 abuts against the first bonding portion 331.

[0275] The first bonding portion 331 can form the aforementioned insulating layer 320 together with the second insulating member 340.

[0276] As can be seen from the following description of the assembly method of the cover plate structure 30, the first insulating component 330 can be connected to the cover plate body 100 by injection molding.

[0277] To ensure the reliability of injection molding, please refer to the following in some embodiments. Figure 16 and Figure 17 The cover plate body 100 has a second step 107 formed on the side away from the connecting terminal 200. The first insulating member 330 also includes a fourth bonding portion 334 that is attached to the second step 107. The fourth bonding portion 334 is connected to the second bonding portion 332.

[0278] It is understandable that the fourth fitting part 334 can increase the contact area between the first insulating member 330 and the cover plate body 100. At the same time, the design of the second step 107 allows the first insulating member 330 to bend to one side on the outside of the second surface 105, thereby improving the connection strength between the first insulating member 330 and the cover plate body 100.

[0279] In some embodiments, please refer to Figure 16 and Figure 17 The terminal platform 210 also includes a protrusion 215 protruding from the outer wall of the base 213 in a direction away from the second through hole 201, and the second insulating member 340 is bent and covered on the outer wall of the protrusion 215.

[0280] It is understandable that by designing the protrusion 215 and the second insulating member 340 to cover the protrusion 215, the insulating structure 300 can cover the terminal platform 210 on its outer periphery, thereby improving the insulation performance of the insulating structure 300.

[0281] The first insulating component 330 can be made of materials with insulating properties such as plastic, and the second insulating component 340 can be made of materials with insulating properties such as ceramic.

[0282] In some embodiments, please refer to Figure 16 and Figure 17 The cover structure 30 also includes a connector 700 disposed between the second insulating member 340 and the protrusion 215.

[0283] Based on the foregoing, it can be seen that the second insulating element 340 covers the outer side of the protrusion 215. Taking the second insulating element as being made of ceramic and the terminal platform 210 as being made of copper as an example, the connection between the second insulating element 340 and the terminal platform 210 can be achieved by brazing. To increase the reliability of the connection between the second insulating element 340 and the terminal platform 210, the connector 700 can be fixed to the second insulating element 340 first, and then the connection between the connector 700 and the terminal platform 210 can be achieved by laser welding, thereby improving the connection strength. Therefore, the connector 700 can be made of metal, and its material can be the same as that of the terminal platform 210.

[0284] In some specific embodiments, please refer to Figure 16 and Figure 17 The second insulating member 340 is provided with a slot 341, and at least the connector 700 is disposed in the slot 341, thereby improving the connection strength between the connector 700 and the second insulating member 340.

[0285] In some embodiments, please refer to Figure 16 The first insulating component 330 is an insulating injection molded part, the second insulating component 340 is an insulating ceramic part, the connector 700 is welded and fixed between the second insulating component 340 and the connecting terminal 200, and the second insulating component 340 is welded and fixed to the cover plate body 100.

[0286] In embodiments where the connector 700 is not provided, the second insulating member 340 may be welded and fixed to the connecting terminal 200.

[0287] The welding method here enables the first insulating component 330 and the second insulating component 340 to fix the connecting terminal 200 and the cover plate body 100, resulting in high connection stability. The connecting component 700 can connect the second insulating component 340 and the connecting terminal 200, further improving the overall structural strength of the cover plate structure 30.

[0288] In some embodiments, please refer to Figure 16 and Figure 17 A recessed area 108 is formed on the cover plate body 100, and a first fitting part 331 and at least a portion of the second insulating member 340 are disposed in the recessed area 108.

[0289] The recessed area 108 can restrict the second insulating element 340. After the second insulating element 340 is installed on the cover plate body 100, the first insulating element 330 can be installed on the cover plate body 100 by injection molding.

[0290] In some embodiments, please refer to Figure 16 and Figure 17 An edge step 102 is formed on the outer side of the cover body 100 for connecting with the battery casing 10.

[0291] In some specific embodiments, a weld is formed between the edge step 102 and the housing 10, which can improve the connection strength between the cover body 100 and the housing 10.

[0292] To better understand the structural composition of the battery and cover structure 30 in the fifth embodiment, the following will be combined with... Figure 16 and Figure 17 To provide further details, the various components mentioned in the following description have been introduced above. The following description will mainly explain the assembly of the battery and cover structure 30 through these components.

[0293] exist Figure 16 In the example shown, the battery includes a casing 10, an electrode core 20, and a cover structure 30. The cover structure 30 includes a cover body 100, a connecting terminal 200, an insulating structure 300, and a connector 700. The connecting terminal 200 includes a terminal platform 210 and a cover 220. The terminal platform 210 includes a base 213, a support portion 214, and a protrusion 215. The insulating structure 300 adopts a combination of a first insulating member 330 and a second insulating member 340. The cover structure 30 has a first through hole 101, the base 213 has a second through hole 201, and the base 213 also has a support platform 202.

[0294] The assembly of the cover plate structure 30 can be carried out in the following manner: the second insulating member 340 is installed into the recessed area 108 of the cover plate body 100 by brazing; then the connector 700 is installed into the slot 341 of the second insulating member 340 by brazing; then the first insulating member 330 is formed on the cover plate body 100 by injection molding, and the first insulating member abuts against the second insulating member 340; then the terminal platform 210 is connected to the connector 700 by laser welding; finally, the cover 220 is installed onto the support portion 214 of the terminal platform 210 by laser welding.

[0295] The battery can be assembled as follows: except for the cover 220, the rest of the cover structure 30 is assembled into one piece in the manner described above. Then, after the tab 21 passes through the first through hole 101 and the second through hole 201, the bent part 21b of the tab 21 is welded to the side of the base 213 away from the electrode core 20. Finally, the cover 220 is connected to the terminal platform 210 by laser welding.

[0296] 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.

[0297] 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.

[0298] 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 cover plate structure (30), characterized in that, include: The cover plate body (100) has a first through hole (101); A connecting terminal (200) is located on the side of the cover plate body (100) away from the pole core (20). The connecting terminal (200) forms a support platform (202). The connecting terminal (200) includes a second through hole (201) penetrating the support platform (202). The second through hole (201) communicates with the first through hole (101). The first through hole (101) and the second through hole (201) are adapted for the electrode tab (21) to pass through so that the electrode tab (21) is connected to the side of the support platform (202) away from the pole core (20). The insulating structure (300) is disposed between the cover body (100) and the connecting terminal (200) to form insulation between the cover body (100) and the connecting terminal (200). The insulating structure (300) also covers the inner wall of the first through hole (101). At least a portion of the insulating structure (300) is injection molded onto the cover body (100).

2. The cover plate structure (30) according to claim 1, characterized in that, The support platform (202) includes a support plane (202a) adapted to be attached to and welded to the tab (21).

3. The cover plate structure (30) according to claim 1, characterized in that, The connection terminal (200) includes a base (213) having a second through hole (201), and at least a portion of the structure of the base (213) forming the support platform (202).

4. The cover plate structure (30) according to claim 3, characterized in that, The connection terminal (200) also includes a support portion (214) that protrudes from the base (213), and the portion of the base (213) located inside the support portion (214) forms the support platform (202).

5. The cover plate structure (30) according to claim 4, characterized in that, The connection terminal (200) also includes: A cover (220) is disposed on the support (214) and covers the seat (213); or, the cover (220) is disposed within the space defined by the support (214) and the seat (213).

6. The cover plate structure (30) according to claim 5, characterized in that, A first step (210a) is formed on the support (214), and the cover (220) is disposed on the first step (210a).

7. The cover plate structure (30) according to claim 5, characterized in that, The cover (220) includes a metal composite.

8. The cover plate structure (30) according to claim 7, characterized in that, The metal composite component includes a copper-aluminum composite block.

9. The cover plate structure (30) according to any one of claims 1 to 8, characterized in that, The insulating structure (300) includes: A multilayer insulating layer (320) is sandwiched between the connecting terminal (200) and the cover plate body (100).

10. The cover plate structure (30) according to claim 1, characterized in that, The insulating structure (300) includes: A first insulating element (330) is provided, which at least covers the periphery of the first through hole (101); and a second insulating member (340), which abuts against the first insulating member (330) and is located between the connecting terminal (200) and the cover plate body (100). The first insulating element (330) and / or the second insulating element (340) are injection molded onto the cover plate body (100).

11. The cover plate structure (30) according to claim 10, characterized in that, The cover plate body (100) includes a first surface (104) facing the connection terminal (200), a second surface (105) facing away from the connection terminal (200), and a third surface (106) connecting the first surface (104) and the second surface (105). The first insulating member (330) includes a first bonding portion (331) attached to the first surface (104), a second bonding portion (332) attached to the second surface (105), and a third bonding portion (333) attached to the third surface (106). The second insulating member (340) abuts against the first bonding portion (331).

12. The cover plate structure (30) according to claim 11, characterized in that, The cover plate body (100) has a second step (107) formed on the side away from the connecting terminal (200), and the first insulating member (330) further includes a fourth fitting part (334) that is attached to the second step (107), and the fourth fitting part (334) is connected to the second fitting part (332).

13. The cover plate structure (30) according to claim 11, characterized in that, The connection terminal (200) also includes a protrusion (215) that protrudes away from the second through hole (201), and the second insulating member (340) is bent and covers the outer side wall of the protrusion (215).

14. The cover plate structure (30) according to claim 11, characterized in that, The cover plate structure (30) also includes: A connector (700) is connected between the second insulating member (340) and the connecting terminal (200).

15. The cover plate structure (30) according to claim 14, characterized in that, The second insulating member (340) is provided with a slot (341), and at least part of the connector (700) is disposed in the slot (341).

16. The cover plate structure (30) according to claim 14, characterized in that, The second insulating component (340) is an insulating ceramic component. The connector (700) is welded and fixed between the second insulating component (340) and the connecting terminal (200). The second insulating component (340) is welded and fixed to the cover plate body (100).

17. The cover plate structure (30) according to any one of claims 11 to 16, characterized in that, A recessed area (108) is formed on the cover plate body (100), and the first fitting part (331) and at least part of the second insulating member (340) are disposed in the recessed area (108).

18. The cover plate structure (30) according to any one of claims 1 to 8, 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).

19. The cover plate structure (30) according to any one of claims 10-16, characterized in that, The first insulating component (330) is an insulating injection molded component.

20. The cover plate structure (30) according to any one of claims 10-13, characterized in that, The second insulating component (340) is an insulating ceramic component. The second insulating component (340) is welded and fixed to the connecting terminal (200), and the second insulating component (340) is welded and fixed to the cover plate body (100).

21. The cover plate structure (30) according to claim 18, characterized in that, The edge step (102) forms a weld with the shell (10).

22. A battery, characterized in that, include: Shell (10); An electrode core (20) is disposed within the housing (10), and the electrode core (20) includes an electrode tab (21); And the cover plate structure (30) according to any one of claims 1 to 21, the cover plate structure (30) being connected to the end of the housing (10), the electrode tab (21) passing through the first through hole (101) and the second through hole (201) and connected to the side of the support platform (202) opposite to the electrode core (20).

23. The battery according to claim 22, characterized in that, The electrode (21) includes: The raised section (21a); And a bending portion (21b) connected to the folding portion (21a), the bending portion (21b) passing through the first through hole (101) and the second through hole (201) and connected to the support platform (202).

24. A battery pack, characterized in that, Includes the battery as described in claim 22 or 23.

25. An electrical appliance, characterized in that, Includes the battery as described in claim 22 or 23, and / or the battery pack as described in claim 24.

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