Cover plate structure, battery, battery pack and electric device

Abstract

The application provides a cover plate structure, a battery, a battery pack and an electric device. The cover plate structure comprises a cover plate body outer connecting piece and a cap. The cover plate body is formed with a through hole. The outer connecting piece is provided with a supporting wall. The supporting wall is formed with a connecting channel communicated with the through hole. The cap is connected to the outer connecting piece. The outer connecting piece is located between the cover plate body and the cap. Part of the structure of the cap extends towards the supporting wall. A connecting space communicated with the connecting channel is formed between part of the structure of the cap and the supporting wall. The cover plate structure can improve the safety performance of the battery and the capacity of the battery.

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 slag formed during the welding process between the cover plate structure and the electrode core can easily enter the battery, which can easily cause a short circuit and poses a significant risk. Furthermore, the welding structure formed during the welding of the cover plate structure and the electrode core will occupy the internal space of the lithium-ion battery, affecting 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 to improve the safety performance and capacity of the battery.

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

[0006] The cover plate body has perforations;

[0007] An external connector is located on the side of the cover plate body facing away from the battery core. The external connector has a support wall with a connection channel communicating with the through hole.

[0008] A cap is connected to an external connector, which is located between the cover plate body and the cap. A connection space is formed between a portion of the cap structure and the support wall, which communicates with the connection channel. The electrode tabs of the electrode core are sequentially inserted through the perforation and the connection channel and extend into the connection space. Both the support wall and the cap are connected to the electrode tabs.

[0009] In this application's cover plate structure, the electrode tabs can extend out of the housing through perforations in the cover plate body and extend into the connection space between the support wall and the cap through a connecting channel. The three are then welded together using a through-welding method. This allows the welded structure of the electrode core and cover plate body to be located outside the housing, increasing the space for the electrode core within the housing and thus improving the battery's energy density. Furthermore, because the welding positions of the electrode tabs, support wall, and cap are outside the housing, using through-welding at the cap's connection point helps prevent weld slag from entering the battery, thus avoiding short circuits caused by weld slag inside the battery. Additionally, welding the cap, electrode tabs, and support wall together increases the current-carrying area of ​​the electrode tabs, increasing current flow. The welding of the electrode tabs and cap also allows the current on the electrode tabs to be directly drawn out through the cap. Compared to drawing current only through external leads, drawing current through the cap results in a shorter flow path, increasing current delivery efficiency.

[0010] In one possible implementation, the support wall includes a support end face located on the side of the support wall opposite to the cover plate body.

[0011] In one possible implementation, the cap includes a connecting portion extending toward the supporting end face, and the connecting portion and the supporting end face form the connecting space.

[0012] In one possible implementation, the cap further includes a fitting portion connected to the connecting portion, the fitting portion being adapted to connect the external connector.

[0013] In one possible implementation, a connecting groove is provided on the side of the connecting portion facing away from the supporting end face, and the connecting groove forms the connecting position.

[0014] In one possible implementation, the cap further includes an extension portion, one end of which is connected to the edge of the connecting portion, and the other end of which is connected to the fitting portion, with a connecting position formed between the extension portion and the connecting portion.

[0015] In one possible implementation, the cap further includes a sealing structure disposed within the connection position enclosed by the extension and the connecting portion, the sealing structure being connected to the extension.

[0016] In one possible implementation, when the tab is located in the connection space, the fitting portion is attached to the external connector, or there is a gap between the fitting portion and the external connector.

[0017] In one possible implementation, the cover structure further includes an insulating structure disposed between the external connector and the cover body to form insulation between the external connector and the cover body.

[0018] In one possible implementation, the external connector further includes an outer edge wall, one end of which is connected to the support wall and the other end of which is connected to the insulating structure.

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

[0020] The first bent wall is connected to the supporting wall;

[0021] The second bent wall is connected to one end of the first bent wall; and

[0022] A third bend wall is connected to one end of the second bend wall, and the third bend wall is also adapted to connect the insulating structure.

[0023] In one possible implementation, the first bent wall and the third bent wall are located on the same side of the second bent wall, and a stress-reducing space is provided between the first bent wall, the second bent wall and the third bent wall.

[0024] In one possible implementation, a gap is formed between the insulating structure and the first bent wall.

[0025] In one possible implementation, the cover structure further includes a support seat disposed on the cover body and connected between the insulating structure and the cover body.

[0026] In one possible implementation, the support base includes:

[0027] The first support portion is connected to the insulating structure;

[0028] The second support portion is connected to the cover plate body; and

[0029] The connecting part is located between the first support part and the second support part.

[0030] In one possible implementation, the cover plate body is provided with a receiving groove, and the second support portion is located within the receiving groove.

[0031] In one possible implementation, the receiving groove is disposed around the edge of the perforation.

[0032] In one possible implementation, the cover structure further includes a top partition extending into the perforation and circumferentially covering the wall of the perforation.

[0033] In one possible implementation, the top partition includes:

[0034] The frame is connected to the cover plate body; and

[0035] An insulating board is connected to the frame and is adapted to extend into the perforation and fit against the inner wall of the perforation.

[0036] In one possible implementation, the frame includes a middle section and stop portions disposed at both ends of the middle section, the middle section being adapted to connect to the cover plate body.

[0037] In one possible implementation, the middle portion is provided with a central through hole, which communicates with the connecting channel.

[0038] A second aspect of this application provides a battery, comprising:

[0039] case;

[0040] An electrode core, disposed within the housing, the electrode core including electrode tabs; and

[0041] A cover plate structure is connected to the end of the housing, and the electrode tab passes through the perforation and the connection channel and is inserted into the connection space.

[0042] In one possible implementation, the dimension of the connection space is smaller than the thickness of the battery tab along the thickness direction of the cover body.

[0043] A third aspect of this application provides a battery pack including the battery described above.

[0044] The fourth aspect of this application provides an electrical device including the aforementioned battery or battery pack. Attached Figure Description

[0045] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0046] Figure 1 This is a schematic diagram of the structure of a battery provided in an embodiment of this application;

[0047] Figure 2 An exploded view of a cover plate structure provided in an embodiment of this application;

[0048] Figure 3A cross-sectional view of a cover plate structure provided in an embodiment of this application;

[0049] Figure 4 A cross-sectional view of a battery provided for an embodiment of this application;

[0050] Figure 5 An exploded view of another cover plate structure provided in an embodiment of this application;

[0051] Figure 6 A cross-sectional view of another cover plate structure provided in an embodiment of this application;

[0052] Figure 7 A cross-sectional view of another battery provided in an embodiment of this application;

[0053] Figure 8 for Figure 2 Schematic diagram of the structure at point A;

[0054] Figure 9 This is a cross-sectional view of another battery provided in an embodiment of this application.

[0055] Explanation of reference numerals in the attached figures:

[0056] 100 - Cover plate structure;

[0057] 10-Cap; 11-Fitting part; 12-Connecting part; 121-Connecting position; 13-Extension part; 14-Sealing structure;

[0058] 20 - External connector; 21 - Support wall; 211 - Connection channel; 212 - Support end face; 22 - Outer edge wall; 221 - First bent wall; 222 - Second bent wall; 223 - Third bent wall; 224 - Stress space;

[0059] 30 - Cover plate body; 31 - Perforation; 32 - Receiving groove;

[0060] 40 - Insulation structure;

[0061] 50 - Support base; 51 - First support part; 52 - Second support part; 53 - Connecting part;

[0062] 60-Top partition; 61-Frame body; 611-Stop part; 612-Middle part; 6121-Middle through hole; 62-Insulating board; 63-Snap-on structure; 631-Snap-on body; 632-Hook;

[0063] 70 - Connection Space;

[0064] 200 - Housing; 210 - Receiving cavity;

[0065] 300 - Core; 310 - Tab.

[0066] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0067] 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.

[0068] 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.

[0069] 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.

[0070] Currently, in lithium-ion batteries, especially in power batteries, the cover plate structure is a sealed structure. To achieve welding between the cover plate structure and the electrode core, an inner lead plate is designed on the inner surface of the cover plate structure. The electrode core may include an electrode tab. The inner lead plate is welded to the electrode tab of the electrode core to achieve electrical connection. Then, the cover plate structure is matched with the battery shell, and the cover plate structure and the battery shell are sealed by laser welding. In this structure, the welding of the tabs to the inner leads occurs inside the battery, making it easy for welding slag to splash into the core, posing a significant risk of internal short circuits. Furthermore, the tabs need to be designed to a certain length for welding to the inner leads. After welding, the tabs typically need to be bent multiple times to maintain a fixed shape and distribute the force, preventing them from being squeezed and causing short circuits by pressing against the positive or negative active materials in the core. To prevent such short circuits, more space and longer tabs are required, reducing battery space utilization. Excessive tab length also leads to cost waste. Moreover, in related technologies, the welding area after the tabs and inner leads are welded is small, resulting in a small current flow area. Additionally, the current drawn from the core by the tabs must pass through the inner leads, resulting in a longer current flow path.

[0071] Based on the above-mentioned situation and problems, this application provides a battery with a structural design that differs from traditional technologies in terms of the cover plate structure and the tabs of the electrode core. The tabs can extend out of the shell to connect with the cover plate structure, and the cover plate structure has a support wall facing away from the shell. The connection between the tabs and the cover plate structure can be completed on this support wall, changing the connection position between the tabs and the cover plate structure from inside the battery to outside the battery. For example, the tabs and the cover plate structure can also be connected by welding, in which case the welding position is located outside the battery. In addition, this application also provides a cap, and the tabs can be disposed between the cap and the support wall. Through the connection point on the cap, the cap, tabs, and support wall can be welded together using a through-welding process. This increases the welding area of ​​the tabs, increases the current flow area, and allows the current from the tabs to be directly drawn from the cap, reducing the current flow path.

[0072] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0073] See Figures 1 to 4As shown, the battery provided in this embodiment includes a casing 200, an electrode core 300, and a cover structure 100. The casing 200 serves as a protective structure for the battery and can be made of a metal material, such as steel or aluminum. The casing 200 has an internal cavity 210.

[0074] The housing 200 can be designed with openings at both ends or at one end. The cover structure 100 can be connected to both ends of the housing 200, or it can be connected to one end of the housing 200. The cover structure 100 can be detachably connected to the housing 200, for example, by a snap-fit ​​structure, a fastening structure, or screws; or, the cover structure 100 can be non-detachably connected to the housing 200, for example, by adhesive or welding; or, the cover structure 100 can be integrally formed with the housing 200, which is not limited in this embodiment.

[0075] The electrode core 300 is disposed within the receiving cavity 210 of the housing 200. The electrode core 300 typically includes a positive electrode sheet, a separator, and a negative electrode sheet, which are stacked to form a stacked electrode core 300 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 300 can store or release electrical energy.

[0076] For the core 300, 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 tab 310 of the core 300 as a whole. The tab 310 can extend out of the housing 200 to connect between the support wall 21 and the cap 10.

[0077] The cover plate structure 100 of this application includes a cover plate body 30, an outer connector 20, and a cap 10. The tab 310 needs to extend between the outer connector 20 and the cap 10 and connect to the outer connector 20 and the cap 10. For this purpose, the cover plate body 30 is provided with a through hole 31, and the outer connector 20 includes a support wall 21, on which a connecting channel 211 communicating with the through hole 31 is provided.

[0078] It should be noted that the connecting channel 211 penetrates the support wall 21 in the thickness direction of the cover plate body 30. For ease of explanation, please refer to [link to documentation]. Figure 2 , Figure 2The X direction is the length direction of the cover plate body 30, the Y direction is the width direction of the cover plate body 30, and the Z direction is the thickness direction of the cover plate body 30. It is worth noting that when the cover plate body 30 is connected to the housing 200, the X direction is parallel to the width direction of the electrode core 300, the Y direction is parallel to the thickness direction of the electrode core 300, and the Z direction is parallel to the length direction of the electrode core 300. In the cover plate structure of this application, along the Z direction, the connecting channel 211 is located above the through hole 31. The electrode tab 310 can extend through the through hole 31 towards the connecting channel 211 to the side of the support wall 21 facing away from the electrode core 300.

[0079] The cap 10 is connected to the outer connector 20. The cap 10 is located on the side of the outer connector 20 facing away from the cover plate body 30, so that the outer connector 20 is located between the cover plate body 30 and the cap 10. A portion of the structure of the cap 10 extends toward the support wall 21, and a connection space 70 communicating with the connection channel 211 is formed between the portion of the structure of the cap 10 and the support wall 21. A connection position 121 is formed on the side of the cap 10 facing away from the connection space 70.

[0080] Understandably, the tab 310 can extend through the connecting channel 211 into the connecting space 70. By performing through welding at the connecting position 121, the cap 10, the tab 310, and the support wall 21 can be welded together. It is worth mentioning that along the thickness direction of the cover plate body 30, the size of the connecting space 70 is less than or equal to the thickness of the tab 310. Thus, when the tab 310 is located in the connecting space 70, the two end faces of the tab 310 in the thickness direction of the cover plate body 30 abut against the support wall 21 and the cap 10, respectively, so that the three can be through welded.

[0081] Therefore, the tab 310 of this application can extend out of the housing 200 through the perforation 31 of the cover plate body 30, and extend into the connection space 70 between the support wall 21 and the cap 10 through the connection channel 211. Then, the three are welded together by penetration welding, so that the welding structure of the electrode core 300 and the cover plate body 30 is located outside the housing 200. This is beneficial to increase the arrangement space of the electrode core 300 inside the housing 200, thereby improving the energy density of the battery. Moreover, since the welding position of the tab 310, the support wall 21, and the cap 10 is outside the housing 200, the three are welded together by penetration welding at the connection position 121 of the cap 10, which helps to prevent welding slag from entering the battery, thereby avoiding short circuit problems caused by welding slag falling into the battery. In addition, by welding the cap 10, the tab 310 and the support wall 21 together, the current flow area of ​​the tab 310 can be increased, which is beneficial to increasing the current flow. Welding the tab 310 and the cap 10 also allows the current on the tab 310 to be directly led out through the cap 10. Thus, compared to leading out the current through the external lead piece, the current flow path through the cap 10 is shorter, which is beneficial to increasing the current transmission efficiency.

[0082] In the embodiments of this application, the battery can be a square battery or a cylindrical battery. Correspondingly, the casing 200, the cover structure 100, and the electrode core 300 can be designed into corresponding structures. For example, in the following embodiments, the casing 200, the cover structure 100, and the electrode core 300 can all be designed into rectangular structures.

[0083] See Figures 2 to 4 As shown, in some feasible ways, the cover body 30 is a structure in the cover structure 100 that needs to be connected with the housing 200. The cover body 30 can be made of metal such as aluminum. The cover body 30 can be closed at one end of the housing 200. The cover body 30 has a through hole 31 that communicates with the receiving cavity of the housing 200.

[0084] The structure of the perforation 31 can be designed according to the different structures of the tab 310. In some embodiments, the tab 310 can be designed as a flat structure along the length of the core 300. To adapt to this structure of the tab 310, the perforation 31 can be a long strip hole with a small opening. Of course, the perforation 31 can also be a rectangular hole with a large opening.

[0085] The external connector 20 can be the positive or negative end in the cover plate structure 100. The external connector 20 can be set on the cover plate body 30. The connection channel 211 of the external connector 20 can be a long strip hole or a rectangular hole.

[0086] Understandably, after passing through the perforation 31 and the connecting channel 211, the tab 310 can connect with the external connector 20 and the cap 10, allowing current to flow from the tab 310 to the external connector 20 and the cap 10. To improve battery safety and prevent current from flowing into the cover body 30, an insulating structure 40 needs to be provided between the cover body 30 and the external connector 20.

[0087] An insulating structure 40 is disposed between the external connector 20 and the cover plate body 30 to form insulation between the external connector 20 and the cover plate body 30. The insulating structure 40 can be designed according to the specific structure of the cover plate body 30 and the external connector 20. As a general design principle, the insulating structure 40 needs to be able to separate the cover plate body 30 and the external connector 20.

[0088] In some cases, the insulating structure 40 may surround the outer periphery of the outer connector 20; in other cases, the insulating structure 40 may be sandwiched between the cover plate body 30 and the outer connector 20. The design of the insulating structure 40 can be referred to the following embodiments.

[0089] In some embodiments, the support wall 21 includes a support end face 212, which is located on the side of the support wall 21 facing away from the cover plate body 30. The support end face 212 is connected to the edge of the connection channel 211, so that when the electrode 310 passes through the connection channel 211 and is located in the connection space 70, it can overlap the support end face 212, so that the electrode 310 and the support wall 21 form a surface contact, which can increase the connection area, not only ensuring the connection reliability, but also increasing the flow area and preventing the phenomenon of excessively rapid heating.

[0090] In some embodiments, the cap 10 of this application may be made of a metal material, which facilitates the transmission of current when connected to the tab 310. The material of the cap 10 may be consistent with the material of the tab 310 and the external connector 20. For example, the cap 10 may be made of copper or aluminum. In this way, when the tab 310 and the cap 10 are welded, the current can be directly transmitted to the cap 10 and then led out through the cap 10.

[0091] The cap 10 of this application includes a connecting portion 12, which is used to connect the tab 310 with the support wall 21. Specifically, the connecting portion 12 extends toward the support end face 212 along the thickness direction of the cover plate body 30. The connecting portion 12 is located above the support end face 212, and there is a gap between the connecting portion 12 and the support end face 212. This gap forms a connection space 70. When the tab 310 passes through the through hole 31 and the connection channel 211 in sequence, it can extend into the gap between the connecting portion 12 and the support end face 212.

[0092] The cap 10 of this application is connected to the external connector 20 by welding. Specifically, the cap 10 also includes a fitting part 11, which is connected to the connecting part 12. When the tab 310 is located between the connecting part 12 and the support end face 212, the fitting part 11 can be connected to the external connector 20 by laser welding.

[0093] It should be noted that, firstly, it is necessary to ensure that the end of the connecting portion 12 facing the support end face 212 can abut against the tab 310, so that the connecting portion 12 and the support end face 212 can clamp the tab 310 between them. Then, the connection between the fitting portion 11 and the outer connector 20 is considered. Thus, when the outer connector 20 and the fitting portion 11 are connected, the fitting portion 11 can fit against the outer connector 20, or there can be a gap between the fitting portion 11 and the outer connector 20. When the tab 310 is connected between the connecting portion 12 and the support end face 212 and the fitting portion 11 fits against the outer connector 20, it means that the thickness of the tab 310 is just sufficient to allow the fitting portion 11 to fit against the outer connector 20. However, the thickness of the tab 310 varies in different batteries, therefore the thickness of the tab 310 fluctuates within a certain range, and this fluctuation forms the assembly tolerance. To ensure that when the tab 310 is located in the connection space 70, the end of the connecting part 12 facing the support end face 212 and the support end face 212 respectively abut against the two ends of the tab 310 in the thickness direction, that is, in order to eliminate the connection problem caused by the thickness tolerance of the tab 310, a certain gap needs to be set between the fitting part 11 and the outer connector 20, so that even if the thinnest tab 310 is located in the connection space 70, the fitting part 11 can still fit the outer connector 20 just right, or there is a small gap between the fitting part 11 and the outer connector 20, so that the tab 310 can be smoothly connected between the connecting part 12 and the support wall 21.

[0094] Alternatively, the bonding part 11 can be configured as a thin sheet structure, making it easier to bend when subjected to force. When the bonding part 11 and the outer connector 20 are bonded, but the two ends of the tab 310 in the thickness direction are not completely in contact with the support end face 212 and the connecting part 12, the connecting part 12 can be squeezed by external force to force it to move toward the tab 310 to bond with the tab 310. At this time, the thin sheet structure of the bonding part 11 is more likely to deform, which is beneficial to the bonding of the connecting part 12 and the tab 310.

[0095] In some embodiments, the connecting portion 12 is used to form a connecting space 70 with the support wall 21, and the fitting portion 11 is used to connect the external connector 20. The connecting portion 12 can be configured as a protruding structure relative to the fitting portion 11. The shape of the protruding structure is not limited, such as it can be square or round. The fitting portion 11 is provided at the edge of the connecting portion 12.

[0096] In order to cooperate with the connecting part 12, the outer connector 20 has a recessed area for accommodating part of the structure of the connecting part 12, so that part of the structure of the connecting part 12 can be housed in the outer connector 20. When part of the structure of the connecting part 12 is housed in the recessed area of ​​the outer connector 20, the fitting part 11 can overlap the edge of the outer connector 20 around the recessed area so that the fitting part 11 and the outer connector 20 can be connected.

[0097] It should be noted that the support wall 21 participates in forming the recessed area of ​​the outer connector 20, and the support end face 212 can serve as the bottom surface of the recessed area. When one end of the connector 12 is accommodated in the recessed area, the recessed space between the connector 12 and the support end face 212 is used to form the connection space 70.

[0098] It should also be noted that the shape and size of the recessed area are consistent with the shape and size of the structure of the connecting part 12 located inside the recessed area, so that the outer peripheral wall of the connecting part 12 can fit against the inner peripheral wall of the recessed area, thereby increasing the sealing performance. In addition, the fitting part 11 is provided around the edge of the connecting part 12, and the fitting part 11 is welded to the edge of the recessed area of ​​the outer connector 20. In this way, not only can the edge of the connecting part 12 be connected to the outer connector 20, so that the cap 10 and the outer connector 20 are fixed, but the welding of the fitting part 11 and the outer connector 20 can also increase the sealing performance between the cap 10 and the outer connector 20.

[0099] In some embodiments, the end of the connecting portion 12 facing away from the support end face 212 can be flush with the end of the fitting portion 11 facing away from the support end face 212, and the end of the connecting portion 12 facing the support end face 212 protrudes towards the support end face 212. Thus, when the cap 10 is connected to the outer connector 20, the thickness of the connecting portion 12 is greater than the thickness of the fitting portion 11 in the thickness direction of the cover plate body 30. To ensure smooth welding between the connecting portion 12, the tab 310, and the support end face 212, a connecting groove is provided on the side of the connecting portion 12 facing away from the support end face 212. The connecting groove forms a connecting position 121, which is also the welding position of the connecting portion 12 and the tab 310. By providing a connecting groove, the thickness of the connecting portion 12 can be reduced, and the position of the connecting groove on the connecting portion 12 meets the standard for through-welding, ensuring that through-welding is performed on the end of the connecting portion 12 facing away from the support end face 212.

[0100] See Figures 5 to 7 As shown, in some embodiments, the cap 10 can also be formed by connecting multiple structural components sequentially. For example, the cap 10 further includes an extension portion 13, one end of which is connected to the edge of the connecting portion 12, and the other end of which is connected to the fitting portion 11. The connecting portion 12 is a plate-like structure, with the extension portion 13 arranged around the edge of the connecting portion 12, and the fitting portion 11 arranged around the edge of the extension portion 13 away from the connecting portion 12. An angle is provided between the extension portion 13 and the connecting portion 12, forming a connection position 121 between them. Because the connecting portion 12 is set as a plate-like structure, its thickness can be set relatively thin, eliminating the need for a connection groove, and allowing direct through-welding of the connecting portion 12 and the tab 310.

[0101] It should be noted that the fitting part 11, the extension part 13 and the connecting part 12 in the above embodiments can be connected by welding, or they can be integrally formed by stamping. When integrally formed by stamping, the process is relatively simple and it is easier to achieve through welding.

[0102] Furthermore, since the battery needs to be connected to the connecting piece during use, and the structure used for this connection is a cap 10, when the cap 10 uses a structure consisting of a fitting part 11, an extension part 13, and a connecting part 12, the extension part 13 and the connecting part 12 form a connection position 121. In this case, the end of the connecting part 12 facing away from the support end face 212 is not flush with the end face of the fitting part 11. Therefore, the cap 10 is only connected to the connecting piece through the fitting part 11, resulting in a small connection area and relatively unstable connection. To ensure the connection stability between the cap 10 and the connecting piece, the cap 10 of this application also includes a sealing structure 14. The sealing structure 14 is made of metal, and the material of the sealing structure 14 can be the same as that of the cap 10. The sealing structure 14 is disposed within the connection position 121 enclosed by the extension part 13 and the connecting part 12, and the outer peripheral wall of the sealing structure 14 is attached to the outer wall of the connecting part 12 and the extension part 13. When the sealing structure 14 is located at the connection position 121, the end of it away from the connection part 12 is flush with the end of the fitting part 11 away from the support end face 212, or the end of the sealing structure 14 away from the connection part 12 protrudes slightly from the end of the fitting part 11 away from the support end face 212. At this time, the edge of the sealing structure 14 and the outer wall of the extension part 13 can be butt welded to connect the sealing structure 14 to the extension part 13.

[0103] See Figure 3 and Figure 6 As shown, in some possible implementations, the outer connector 20 further includes an outer edge wall 22, one end of which is connected to the support wall 21, and the other end of which is connected to the insulating structure 40. The outer edge wall 22 can serve as a structure for the outer connector 20 to connect with the insulating structure 40. Simultaneously, the outer edge wall 22 can also cooperate with the support wall 21 to form a recessed area. For example, one end of the outer edge wall 22 can be bent, and the bent end can be connected to the support wall 21 around its outer edge, thus forming a recessed area between the bent portion of the outer edge wall 22 and the support wall 21.

[0104] Specifically, the outer edge wall 22 includes a first bent wall 221, a second bent wall 222, and a third bent wall 223. The first bent wall 221 is connected to the support wall 21, the second bent wall 222 is connected to the end of the first bent wall 221 away from the support wall 21, and the third bent wall 223 is connected to the end of the second bent wall 222 away from the first bent wall 221. The end of the third bent wall 223 away from the second bent wall 222 is also suitable for connecting the insulating structure 40.

[0105] By setting the first bent wall 221, the second bent wall 222 and the third bent wall 223, a recessed area can be formed in conjunction with the support wall 21, and the entire external connector 20 can be connected to the insulating structure 40 to ensure the stability of the position of the external connector 20.

[0106] In some embodiments, the first bent wall 221 is bent relative to the supporting wall 21, and the bending angle is not limited. In this application, it is illustrated by the first bent wall 221 bending 90° relative to the supporting wall 21. Similarly, the second bent wall 222 is bent relative to the first bent wall 221, and the bending angles of both are also not limited. In this application, it is illustrated by the second bent wall 222 bending 90° relative to the first bent wall 221. The second bent wall 222 and the supporting wall 21 are located at opposite ends of the first bent wall 221, and are located on opposite sides of the first bent wall 221. The first bent wall 221 and the third bent wall 223 are located on the same side of the second bent wall 222. This allows the first bent wall 221 to be located inside the second bent wall 222, and the third bent wall 223 to be located outside the second bent wall 222. A stress space 224 is formed between the first bent wall 221, the second bent wall 222, and the third bent wall 223. By configuring the first bent wall 221, the second bent wall 222, and the third bent wall 223, the outer edge wall 22 can form an inner and outer two-layer structural ring, which can improve the structural strength of the outer edge wall 22. Furthermore, the fitting portion 11 and the second bent wall 222 in this application can be connected by welding. When the fitting portion 11 and the second bent wall 222 are welded, the stress space 224 formed between the first bent wall 221, the second bent wall 222, and the third bent wall 223 can serve as a stress relief space. The main reason is that when the stress space 224 is formed, the first bent wall 221, the second bent wall 222, and the third bent wall 223 are bent together, which makes the end face area of ​​the stress space 224 larger. When there is residual stress between the mating part 11 and the second bent wall 222 due to welding, the residual stress can be redistributed from a smaller area to a larger area, that is, it can be transferred to the end face used to form the stress space 224. At this time, it is easier to release the stress into the stress space 224 to complete the stress release. When the third bent wall 223 and the insulating structure 40 are connected by welding, the stress generated by welding between the two can also be released through a similar principle to reduce the residual stress when the outer edge wall 22 and the insulating structure 40 are connected. Moreover, by bending the first bent wall 221, the second bent wall 222 and the third bent wall 223, the entire outer edge wall 22 is a bent structure. The bent structure has a certain degree of flexibility, which allows it to deform under external loads, thereby absorbing and relieving stress.

[0107] The insulating structure 40 of this application is a ring structure, forming insulation between the cover plate body 30 and the external connector 20 in an enclosing manner. The insulating ring structure is made of materials with insulating properties such as ceramic or plastic. During connection, the side of the third bent wall 223 facing the support wall 21 abuts against one side of the insulating structure 40, and can be connected by adhesive or welding. The cover plate body 30 is directly or indirectly connected to the other side of the insulating structure 40. Thus, the insulating structure 40 can separate the cover plate body 30 and the external connector 20, thereby providing insulation.

[0108] It should be noted that in some embodiments, a gap is formed between the insulating structure 40 and the first bent wall 221 to improve the insulation effect, thereby separating the insulating structure 40 and the first bent wall 221. This further separates the cover plate body 30 and the outer connector 20, improving the insulation performance.

[0109] See also Figure 3 and Figure 6 As shown, in some possible implementations, the cover structure 100 also includes a support 50 disposed on the cover body 30. The support 50 can be used to separate the cover body 30 from the external connector 20 and to support the external connector 20 away from the cover body 30.

[0110] Understandably, when setting up the support, the support base 50 can be located between the insulating structure 40 and the cover plate body 30. One end of the support base 50 can abut against the cover plate body 30, and the other end can abut against the insulating structure 40, for supporting the insulating structure 40 and the external connector 20. The support base 50 can increase the distance between the external connector 20 and the cover plate body 30, thereby improving the insulation performance between the cover plate body 30 and the external connector 20.

[0111] In some embodiments, the support base 50 includes a first support portion 51, a second support portion 52, and a connecting portion 53. The first support portion 51 is used to connect the insulating structure 40, the second support portion 52 is used to connect the cover plate body 30, and the connecting portion 53 is connected between the first support portion 51 and the second support portion 52. The connecting portion 53 is used to connect the first support portion 51 and the second support portion 52 together so that the support base 50 forms an integral structure.

[0112] The support base 50 can be made of metal material. The first support part 51 can be connected to the insulating structure 40 by laser welding, and the second support part 52 can be connected to the cover plate body 30 by laser welding.

[0113] The first support portion 51 and the second support portion 52 can be located on the same side of the joint portion 53 or on opposite sides of the joint portion 53. When the first support portion 51 and the second support portion 52 are located on opposite sides of the joint portion 53, the first support portion 51 and the second support portion 52 are respectively located on opposite sides of the joint portion 53 in the thickness direction, and the first support portion 51 and the second support portion 52 are respectively located at opposite ends of the joint portion 53. Thus, when the support base 50 is connected between the cover plate body 30 and the insulating structure 40, the first support portion 51 and the second support portion 52 are arranged along the thickness direction of the cover plate body 30. This arrangement increases the support strength of the support base 50 and can also be used to reduce the connection stress when the support base 50, the insulating structure 40, and the cover plate body 30 are connected.

[0114] In some embodiments, a receiving groove 32 is provided on the cover plate body 30, and the second support portion 52 can be disposed within the receiving groove 32. The receiving groove 32 can be used to make room, reducing the space occupied by the support base 50 in the thickness direction of the cover plate body 30, thereby reducing the overall volume of the cover plate structure 100. Furthermore, the shape and size of the receiving groove 32 can be set to be consistent with the shape and size of the second support portion 52, so that the receiving groove 32 can also serve as a limiting mechanism, preventing the support base 50 from easily moving when connected to the cover plate body 30.

[0115] In some embodiments, the receiving groove 32 is disposed around the edge of the through hole 31, and the receiving groove 32 may communicate with the through hole 31.

[0116] In some feasible embodiments, the cover structure 100 also includes a top partition 60, which may be made of insulating materials such as plastic. A portion of the top partition 60 may be inserted into the perforation 31, in which case this portion of the top partition 60 may cover the wall of the perforation 31 circumferentially, for example, a portion of the top partition 60 may surround the inner wall of the perforation 31 circumferentially.

[0117] As mentioned above, the tab 310 needs to extend from the perforation 31 of the cover plate body 30 to connect between the support wall 21 and the connecting part 12. In order to prevent the cover plate body 30 and the tab 310 from forming an electrical connection, insulation needs to be formed between the tab 310 and the cover plate body 30. The top spacer 60 of this application is made of insulating material. Therefore, the top spacer 60 that passes through the perforation 31 can be used to separate the tab 310 and the cover plate body 30, so that insulation is formed between the tab 310 and the cover plate body 30.

[0118] See Figure 2 and Figure 5As shown, in some embodiments, the top partition 60 includes a frame 61 and an insulating plate 62. The frame 61 serves as the main structure of the top partition 60 and can be used to connect with the housing 200. The insulating plate 62 is disposed on the frame 61 and is adapted to extend into the perforation 31 and fit against the inner wall of the perforation 31.

[0119] It should be noted that there are multiple insulating plates 62 in this application, and the multiple insulating plates 62 can be connected end to end to ensure that an insulating space is formed. When the insulating plate 62 is inserted into the through hole 31, the tab 310 can extend into the insulating space.

[0120] The frame 61 of this application includes a middle portion 612 and stop portions 611 disposed at both ends of the middle portion 612. The stop portions 611 can fit against the bottom wall of the cover plate body 30 and can limit the position of the electrode core 300 to prevent the electrode core 300 from shaking within the housing 200. The stop portions 611 and the middle portion 612 of this application can be separately disposed, so that the stop portions 611 and the middle portion 612 can be manufactured separately, or the stop portions 611 and the middle portion 612 can also be integrally formed.

[0121] In some embodiments, the insulating plate 62 is connected to the middle portion 612, the middle portion 612 is provided with a middle through hole 6121, the middle through hole 6121 penetrates the middle portion 612 and communicates with the connecting channel 211, the middle through hole 6121 is located in the insulating space enclosed by the insulating plate 62, when the stop portion 611 is attached to the bottom wall of the cover plate body 30, the insulating plate 62 is inserted into the through hole 31, and the tab 310 can extend toward the connecting channel 211 through the middle through hole 6121.

[0122] Combined Figure 8 and Figure 9 As shown in the embodiment of this application, the middle part 612 is adapted to connect to the cover plate body 30, and the middle part 612 and the cover plate body 30 can be connected by a detachable structure such as a snap-fit ​​structure or a fastening structure. For example, in this embodiment of the application, a snap-fit ​​structure 63 is provided on the middle part 612, and the middle part 612 can be connected to the cover plate body 30 through the snap-fit ​​structure 63.

[0123] Specifically, the latching structure 63 includes a latching body 631 and a latching hook 632. One end of the latching body 631 is connected to the middle part 612, and the other end of the latching body 631 extends away from the middle part 612. The latching hook 632 is connected to the end of the latching body 631 away from the middle part 612. When the stop part 611 is attached to the bottom wall of the cover plate body 30, the latching hook 632 can pass through the through hole 31 and abut against the side of the second support part 52 facing away from the cover plate body 30, thus achieving relative fixation between the top partition 60 and the cover plate body 30.

[0124] This application also provides a battery pack, which may include the battery described above.

[0125] Specifically, the battery pack may contain multiple batteries as described above, which may be connected in series and / or in parallel.

[0126] The battery pack of this embodiment, by using the battery of the above embodiment, can increase the battery pack capacity, thereby improving the battery life and also improving safety.

[0127] This application also provides an electrical device, which may include the battery or battery pack described in the above embodiments.

[0128] For example, when the electrical equipment is a mobile phone, tablet computer, laptop computer, or similar device, the aforementioned battery can be used as an energy storage and supply device. When the electrical equipment is a vehicle, energy storage cabinet, energy storage container, or similar device, the aforementioned battery pack can be used as an energy storage and supply device.

[0129] The electrical equipment in this embodiment, by using the battery or battery pack described above, helps to improve battery life and enhance safety.

[0130] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0131] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A cover plate structure (100) applied to a battery, characterized by, include: The cover plate body (30) has a perforation (31) formed thereon; An external connector (20) is located on the side of the cover plate body facing away from the battery core. The external connector (20) is provided with a support wall (21), and a connection channel (211) communicating with the through hole (31) is formed on the support wall (21). A cap (10) is connected to an external connector (20). The external connector (20) is located between the cover plate body (30) and the cap (10). A connection space (70) communicating with the connection channel (211) is formed between a portion of the structure of the cap (10) and the support wall (21). The tabs (310) of the pole core (300) are sequentially inserted through the perforation (31) and the connection channel (211) and extend into the connection space (70). The support wall (21) and the cap (10) are both connected to the tabs (310).

2. The cover plate structure (100) according to claim 1, characterized in that The support wall (21) includes a support end face (212), which is located on the side of the support wall (21) facing away from the cover plate body (30).

3. The cover plate structure (100) according to claim 2, characterized in that The cap (10) includes a connecting portion (12) that extends toward the supporting end face (212) and forms the connecting space (70) between the connecting portion (12) and the supporting end face (212).

4. The cover plate structure (100) according to claim 3, characterized in that The cap (10) further includes a fitting part (11), which is connected to the connecting part (12) and is adapted to connect the external connector (20).

5. The cover plate structure (100) according to claim 4, characterized in that The connecting part (12) has a connecting groove on the side facing away from the supporting end face (212), and the connecting groove forms a connecting position (121).

6. The cover plate structure (100) according to claim 4, characterized in that The cap (10) also includes an extension (13), one end of which is connected to the edge of the connecting part (12), and the other end of which is connected to the fitting part (11). A connecting position (121) is formed between the extension (13) and the connecting part (12).

7. The cover plate structure (100) according to claim 6, characterized in that The cap (10) also includes a sealing structure (14), which is disposed within the connection position (121) enclosed by the extension (13) and the connection (12), and the sealing structure (14) is connected to the extension (13).

8. The cover plate structure (100) according to claim 4, characterized in that When the tab (310) is located in the connection space (70), the fitting part (11) is fitted to the outer connector (20), or there is a gap between the fitting part (11) and the outer connector (20).

9. The cover plate structure (100) according to claim 1, characterized in that The cover plate structure (100) further includes an insulating structure (40) disposed between the external connector (20) and the cover plate body (30) to form insulation between the external connector (20) and the cover plate body (30).

10. The cover plate structure (100) according to claim 9, characterized in that The external connector (20) also includes an outer edge wall (22), one end of which is connected to the support wall (21), and the other end of which is connected to the insulating structure (40).

11. The cover plate structure (100) according to claim 10, characterized in that The outer edge wall (22) includes: The first bent wall (221) is connected to the supporting wall (21); A second bent wall (222) is connected to one end of the first bent wall (221); and A third bend wall (223) is connected to one end of the second bend wall (222), and the third bend wall (223) is also adapted to connect the insulating structure (40).

12. The cover plate structure (100) according to claim 11, characterized in that The first bent wall (221) and the third bent wall (223) are located on the same side of the second bent wall (222), and a stress space (224) for stress reduction is provided between the first bent wall (221), the second bent wall (222) and the third bent wall (223).

13. The cover plate structure (100) according to claim 11, characterized in that A gap is formed between the insulating structure (40) and the first bent wall (221).

14. The cover plate structure (100) according to claim 9, characterized in that The cover plate structure (100) further includes a support base (50), which is disposed on the cover plate body (30) and is connected between the insulating structure (40) and the cover plate body (30).

15. The cover plate structure (100) according to claim 14, characterized in that The support base (50) includes: The first support part (51) is connected to the insulating structure (40); The second support (52) is connected to the cover plate body (30); and The connecting part (53) is connected between the first support part (51) and the second support part (52).

16. The cover plate structure (100) according to claim 15, characterized in that The cover plate body (30) is provided with a receiving groove (32), and the second support part (52) is located in the receiving groove (32).

17. The cover plate structure (100) according to claim 16, characterized in that The receiving groove (32) is provided around the edge of the perforation (31).

18. The cover structure (100) according to any one of claims 1-17, characterized in that The cover structure (100) also includes a top partition (60) that extends into the perforation (31) and covers the wall of the perforation (31) circumferentially.

19. The cover plate structure (100) according to claim 18, characterized in that The top partition (60) includes: The frame (61) is connected to the cover plate body (30); and An insulating plate (62) is connected to the frame (61) and is adapted to extend into the perforation (31).

20. The cover plate structure (100) according to claim 19, characterized in that The frame (61) includes a middle part (612) and stop parts (611) disposed at both ends of the middle part (612), the middle part (612) being adapted to connect to the cover plate body (30).

21. The cover plate structure (100) according to claim 20, characterized in that The middle part (612) is provided with a middle through hole (6121), which is connected to the connecting channel (211).

22. A battery, characterized by include: Casing (200); An electrode core (300) is disposed within the housing (200), the electrode core (300) including a tab (310); and The cover plate structure (100) according to any one of claims 1-21, the cover plate structure (100) is connected to the end of the housing (200), and the tab (310) passes through the perforation (31) and the connection channel (211) and is inserted into the connection space (70).

23. The battery of claim 22, wherein, Along the thickness direction of the cover plate body (30), the size of the connecting space (70) is smaller than the thickness of the tab (310).

24. A battery pack, characterized by The battery included in any one of claims 22-23.

25. An electrical device, comprising: Includes the battery according to any one of claims 22 to 23; or the battery pack according to claim 24.

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