Battery, battery pack and electric device

Abstract

This application relates to the field of battery technology, providing a battery, a battery pack, and an electrical device. The battery includes a casing, an end cap assembly, a core, and tabs. The core is disposed within the casing, and the tabs are connected to the core, with one end of the tab extending outside the casing cavity. One end of the tab is located between the connector and the top cover, such that one end of the tab is clamped by the connector and the top cover. A weldment is inserted through the top cover, the tab, and part of the connector, allowing the top cover, the tab, and the connector to be electrically connected, thereby enabling the core to be electrically connected to the top cover via the tab. The connector serves to support one end of the tab, making the tab welding more stable. Since the top cover, one end of the tab, and the connector are all located outside the casing cavity, debris generated during the welding process will not fall into the casing cavity, thus preventing debris from damaging the core, ensuring the battery's safety and reliability, and improving the battery manufacturing yield.

Description

Technical Field

[0001] This application relates to a battery, a battery pack, and an electrical device, belonging to the field of battery technology. Background Technology

[0002] The battery structure mainly includes a casing, a core, and tabs. The core is located inside the casing, and the tabs are connected to the core. The tabs need to be connected to the battery end caps so that the core can be connected to external connectors through the tabs and end caps.

[0003] Currently, in order to ensure the reliability of the connection between the tab and the end cap, welding can be used to connect the tab and the end cap. However, the spatter generated during the welding process may fall into the casing, thereby damaging the core and resulting in a low yield of the battery. Utility Model Content

[0004] This application provides a battery, a battery pack, and an electrical device to solve the problem in the related art where debris generated during the welding of the battery tabs and end caps can damage the battery core.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, this application provides a battery, comprising:

[0007] The housing has a cavity and a mounting port, the mounting port communicating with the cavity;

[0008] An end cap assembly includes a cover plate, a connector, and a top cover. The cover plate is disposed at the mounting opening to block at least a portion of the mounting opening. The connector is disposed on the cover plate, and the top cover is located on the side of the connector facing away from the cover plate.

[0009] The electrode core is disposed within the cavity;

[0010] The electrode tab has a first end connected to the electrode core, a second end passing through the cover plate, a portion of the electrode tab adjacent to the second end overlapping the side of the connector facing away from the cover plate, and a top cover pressing against the side of the electrode tab facing away from the connector.

[0011] The top cover, the portion of the electrode near the second end, and the connector are welded together to form a welded part that passes through the top cover, the portion of the electrode near the second end, and the connector.

[0012] In some embodiments, the electrode tab includes a first electrode tab segment and a second electrode tab segment. The first electrode tab segment is connected to the electrode core, and the second electrode tab segment is connected to the end of the first electrode tab segment away from the electrode core. The second electrode tab segment overlaps the side of the connector facing away from the cover plate, and the second electrode tab segment is perpendicular to the first electrode tab segment.

[0013] In some embodiments, the electrode tab further includes a third electrode tab segment and a fourth electrode tab segment. The third electrode tab segment is connected to the end of the first electrode tab segment away from the electrode core, and the third electrode tab segment is opposite to the side of the connector away from the second electrode tab segment. One end of the fourth electrode tab segment is connected to the end of the third electrode tab segment away from the first electrode tab segment, and the other end of the fourth electrode tab segment is connected to the second electrode tab segment. The fourth electrode tab segment is opposite to the sidewall of the connector.

[0014] In some embodiments, the connector includes an overlapping portion and a sealing portion, one end of the overlapping portion is connected to the sealing portion, the electrode lug overlaps the overlapping portion, and the sealing portion is arranged at an angle to the overlapping portion so that the sealing portion is opposite to the outer wall of the top cover.

[0015] In some embodiments, the connector further includes a support portion connected to the side of the sealing portion opposite to the overlapping portion, the support portion being located between the cover plate and the top cover, and the support portion being supported by the top cover.

[0016] In some embodiments, the thickness of the overlapping portion in the first direction is 0.2mm-2.5mm, the length of the overlapping portion in the second direction is 50mm-100mm, and the width of the overlapping portion in the third direction is 5mm-10mm.

[0017] Wherein, the first direction is the overlapping direction of the electrode and the overlapping part, and the first direction, the second direction and the third direction are perpendicular to each other.

[0018] In some embodiments, the end cap assembly further includes a first insulating member located between the support and the cover plate to insulate the support from the cover plate.

[0019] In some embodiments, the end cap assembly further includes a second insulating element disposed between the electrode core and the cover plate to insulate and separate the electrode core from the cover plate.

[0020] In some embodiments, the cover plate has a second opening through which the electrode tab passes, and a portion of the second insulating member passes through the second opening and is fastened to the cover plate.

[0021] In some embodiments, the cover plate assembly further includes a support member disposed between the cover plate and the first insulating member, wherein the second insulating member is fastened to the support member.

[0022] In some embodiments, the first insulating element is a ceramic element, and the second insulating element is a plastic element.

[0023] In some embodiments, the top cover has a welding groove on the side facing away from the electrode tab, and the welded component passes through the bottom wall of the welding groove.

[0024] In some embodiments, there are two end cap assemblies and two electrode tabs, with the two electrode tabs respectively connected to opposite sides of the electrode core. The housing has two mounting ports, and the two end cap assemblies are respectively disposed in the two mounting ports. The two electrode tabs are respectively welded to the two end cap assemblies.

[0025] In some embodiments, the battery further includes a connection terminal, and the two tabs include a positive tab and a negative tab, the connection terminal being disposed on the top cover of the end cover assembly corresponding to the negative tab.

[0026] In some embodiments, the connector of the end cap assembly corresponding to the positive electrode tab is an aluminum structural component, and the connector of the end cap assembly corresponding to the negative electrode tab is a copper structural component.

[0027] Secondly, based on the battery described above, this application also proposes a battery pack that includes the battery described above.

[0028] Thirdly, based on the battery or battery pack described above, this application also proposes an electrical device that incorporates the battery or battery pack described above.

[0029] In the battery provided in this application, the electrode core is disposed within the casing, and the electrode tab is connected to the electrode core, with one end of the electrode tab extending outside the cavity of the casing. One end of the electrode tab is located between the connector and the top cover, so that one end of the electrode tab is clamped by the connector and the top cover. A weldment is inserted through the top cover, the electrode tab, and part of the connector, allowing the top cover, the electrode tab, and the connector to be electrically connected, thereby allowing the electrode core to be electrically connected to the top cover through the electrode tab. The connector serves to support one end of the electrode tab, making the electrode tab welding more stable. Since the top cover, one end of the electrode tab, and the connector are all located outside the cavity of the casing, the debris generated during the welding process will not fall into the cavity of the casing, thus preventing debris from damaging the electrode core, ensuring the safety and reliability of the battery, and improving the yield of battery manufacturing.

[0030] The battery pack provided in this application, including the battery mentioned above, makes the battery pack safer and more reliable, and has a high yield rate.

[0031] The electrical equipment provided in this application, including the battery or battery pack mentioned above, enables the electrical equipment to operate safely and stably. Attached Figure Description

[0032] 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.

[0033] Figure 1 A schematic diagram of a battery provided in an embodiment of this application;

[0034] Figure 2 This is a schematic diagram of the end cap of the battery provided in an embodiment of this application;

[0035] Figure 3 for Figure 2 A cross-sectional schematic diagram of AA in the middle;

[0036] Figure 4 for Figure 3 A magnified view of area B in the middle;

[0037] Figure 5 for Figure 3 A magnified view of area C in the middle;

[0038] Figure 6 A schematic diagram of the battery connector provided in an embodiment of this application;

[0039] Figure 7 This is a schematic diagram of the top cover of the battery provided in an embodiment of this application;

[0040] Figure 8 This is a schematic diagram of the second insulating element of the battery provided in an embodiment of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100 - Housing; 110 - Cavity; 120 - Mounting port;

[0043] 200 - End cap assembly; 210 - Cover plate; 220 - Connector; 221 - Overlap; 222 - Sealing part; 223 - Support part; 230 - Top cover; 231 - Welding groove; 240 - First insulating component; 250 - Second insulating component; 251 - Insulation separation part; 252 - Insulation connection part; 260 - Support component; 270 - Connecting terminal;

[0044] 300-core;

[0045] 400 - tab; 400a - positive tab; 400b - negative tab; 410 - first tab segment; 420 - second tab segment; 430 - third tab segment; 440 - fourth tab segment;

[0046] 500 - Welded parts. Detailed Implementation

[0047] 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. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0048] The battery structure mainly includes a casing, a core, and tabs. The core is located inside the casing, and the tabs are connected to the core. The tabs need to be connected to the battery end caps so that the core can be connected to external connectors through the tabs and end caps.

[0049] Currently, in order to ensure the reliability of the connection between the tab and the end cap, welding can be used to connect the tab and the end cap. However, the spatter generated during the welding process may fall into the casing, thereby damaging the core and resulting in a low yield of the battery.

[0050] In the battery proposed in this application, the electrode core is disposed within the casing, and the electrode tab is connected to the electrode core, with one end of the electrode tab extending outside the cavity of the casing. One end of the electrode tab is located between the connector and the top cover, so that one end of the electrode tab is clamped by the connector and the top cover. The welded component passes through the top cover, the electrode tab, and part of the connector, allowing the top cover, the electrode tab, and the connector to be electrically connected, thereby enabling the electrode core to be electrically connected to the top cover through the electrode tab. The connector serves to support one end of the electrode tab, making the electrode tab welding more stable. Since the top cover, one end of the electrode tab, and the connector are all located outside the cavity of the casing, the debris generated during the welding process will not fall into the cavity of the casing, thus preventing debris from damaging the electrode core, ensuring the safety and reliability of the battery, and improving the yield of battery manufacturing.

[0051] The battery pack proposed in this application, including the battery mentioned above, makes the battery pack safer and more reliable, and has a high yield rate.

[0052] The electrical equipment proposed in this application, including the battery or battery pack mentioned above, enables the electrical equipment to operate safely and stably.

[0053] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0054] This application discloses a battery, with reference to... Figures 1 to 4 As shown, the battery includes a housing 100, an end cap assembly 200, an electrode core 300, electrode tabs 400, and a welded component 500. This battery can be used in battery packs or in electrical appliances.

[0055] The casing 100 is the basic component of the battery in this application. The casing 100 provides a mounting base for at least some other components of the battery and serves to protect them. The casing 100 can be made of metal, giving it better structural strength, thus improving its durability and reliability. Alternatively, the casing 100 can be constructed using a combination of metal and polymer materials. Specifically, parts of the casing 100 that are easily subjected to external impact or damage can be made of metal, while other parts can be made of polymer materials. This allows the casing 100 to achieve good structural strength without excessive weight.

[0056] The housing 100 has a cavity 110, which is a hollow structure within the housing 100. The housing 100 also has a mounting port 120, which is an opening on the surface of the housing 100 and communicates with the mounting cavity. When manufacturing the battery of this application, other components of the battery can be mounted into the cavity 110 of the housing 100 through the mounting port 120.

[0057] The end cap assembly 200 includes a cover plate 210, a connector 220, and a top cover 230. The cover plate 210 is disposed at the mounting opening 120 to at least partially block the mounting opening 120, thereby sealing the cavity 110. The connector 220 is disposed on the cover plate 210, and the top cover 230 is located on the side of the connector 220 facing away from the cover plate 210. Specifically, the cover plate 210, connector 220, and top cover 230 can be stacked sequentially along their thickness direction.

[0058] The electrode core 300 is disposed within the cavity 110 of the housing 100. One end of the electrode tab 400 is connected to the electrode core 300, and the other end of the electrode tab 400 extends through the mounting opening 120 of the housing 100 to the outside of the cavity 110. Specifically, the end of the electrode tab 400 connected to the electrode core 300 is the first end of the electrode tab 400, and the end of the electrode tab 400 facing away from the electrode core 300 is the second end. The second end of the electrode tab 400 correspondingly passes through the cover plate 210 disposed in the mounting opening 120 to the outside of the cavity 110 of the housing 100. The electrode core 300 and the electrode tab 400 can be an integral structure, or the electrode tab 400 can be manufactured separately and then connected; this application does not impose any restrictions on this.

[0059] The second end of the tab 400 can extend between the top cover 230 and the connector 220, so that the second end of the tab 400 is sandwiched between the top cover 230 and the connector 220. In this way, the connector 220, the second end of the tab 400 and the top cover 230 can be stacked in sequence. The connector 220 can support the second end of the tab 400, and the top cover 230 can press against the second end of the tab 400 to fix the second end of the tab 400 to the connector 220.

[0060] The top cover 230, the second end of the electrode tab 400, and the connector 220 are connected by welding to form a welded component 500 that passes through the second end of the top cover 230, the electrode tab 400, and part of the connector 220. The welded component 500 can fix and electrically connect the top cover 230, the electrode tab 400, and the connector 220, thus ensuring a reliable connection and fixation between the cover, the electrode tab 400, and the connector 220.

[0061] It should be understood that since the top cover 230 and the connector 220 are both located outside the cavity 110 of the housing 100, and the second end of the tab 400 extends outside the cavity 110, when welding the top cover 230, the second end of the tab 400, and the connector 220, welding can be initiated from the top surface of the top cover 230, and the top cover 230, the second end of the tab 400, and part of the connector 220 can be sequentially welded through the top cover 230, the tab 400, and the connector 220 to form a welded part 500 that passes through the top cover 230, the tab 400, and the connector 220. During the welding process, the welding parts are all located outside the cavity 110 of the housing 100. Consequently, the spatter generated during welding will not enter the cavity 110 of the housing 100, thereby preventing the debris from damaging the electrode core 300, protecting the battery, and improving the battery yield.

[0062] Specifically, during the welding of the top cover 230, the tab 400, and the connector 220, due to the shielding effect of the cover plate 210, the second end of the tab 400, and the connector 220, the generated spatter mainly diffuses outward from the housing 100, and some spatter may be located between the cover plate 210 and the second end of the tab 400, and between the second end of the tab 400 and the connector 220. This effectively prevents spatter from falling into the housing 100.

[0063] In some implementations, reference Figures 4 to 5 As shown, it should be understood that when the electrode core 300 is disposed within the cavity 110 of the housing 100, the thickness direction of the electrode core 300 is parallel to the plane where the mounting port 120 is located. Correspondingly, the orientation of the end of the electrode core 300 used to connect with the electrode tab 400 is the same as the orientation of the mounting port 120. The electrode tab 400 of this application may include a first electrode tab section 410 and a second electrode tab section 420. The first end of the electrode tab 400 is located at the first electrode tab section 410, which is connected to one end of the electrode core 300. The second electrode tab section 420 is connected to the end of the first electrode tab section 410 away from the electrode core 300, and the electrode tab 400 end of the electrode tab 400 is located at the end of the second electrode tab section 420 away from the first electrode tab section 410. The second electrode tab section 420 overlaps the side of the connector 220 facing away from the cover plate 210, and the second electrode tab section 420 is perpendicular to the first electrode tab section 410.

[0064] Specifically, the first tab section 410 extends from the end of the electrode core 300 toward the mounting port 120 of the housing 100, and the second tab section 420 is bent relative to the first tab section 410, so that the outer walls on opposite sides of the second tab section 420 with larger surface areas can contact the connector 220 and the top cover 230, thereby increasing the contact area between the tab 400 and the top cover 230 and the connector 220, making the electrical connection effect of the top cover 230, the tab 400 and the connector 220 better, and enhancing the overcurrent capacity.

[0065] Furthermore, the connector 220, the second tab segment 420, and the top cover 230 can be arranged in the stacking direction, with the top cover 230 covering the second tab segment 420, and the connector 220 also covering the second tab segment 420. This allows for a relatively larger contact area between the top cover 230, the second tab segment 420, and the connector 220, resulting in a larger welding area. The weldment 500 formed when laser welding penetrates the top cover 230, the second tab segment 420, and the connector 220 is also larger, further enhancing the electrical connection effect of the top cover 230, the second tab segment 420, and the connector 220.

[0066] In some implementations, reference Figures 4 to 5As shown, the electrode tab 400 of this application may further include a third electrode tab segment 430 and a fourth electrode tab segment 440. The third electrode tab segment 430 is connected to the end of the first electrode tab segment 410 away from the electrode core 300, and the third electrode tab segment 430 is opposite to the side of the connector 220 away from the second electrode tab segment 420. Thus, the second electrode tab segment 420 and the fourth electrode tab segment 440 are located on opposite sides of the connector 220. One end of the fourth electrode tab segment 440 is connected to the end of the third electrode tab segment 430 away from the first electrode tab segment 410, and the other end of the fourth electrode tab segment 440 is connected to the second electrode tab segment 420. The fourth electrode tab segment 440 is opposite to the sidewall of the connector 220. By providing the fourth electrode tab segment 440, the electrode tab 400 can bypass the sidewall of the connector 220, thereby placing the second electrode tab segment 420 between the connector 220 and the top cover 230.

[0067] Specifically, the third tab segment 430 is parallel to the second tab segment 420, and correspondingly, the third tab segment 430 is angled to the first tab segment 410. The fourth tab segment 440 is parallel to the first tab segment 410, so that the fourth tab segment 440 is angled to both the second tab segment 420 and the third tab segment 430, and the angle can be 90°. In this way, both the second tab segment 420 and the third tab segment 430 can extend in a direction parallel to the plane of the mounting opening 120, so that the second tab segment 420 and the third tab segment 430 occupy less space in the orientation direction of the mounting opening 120, thus making the structure of the tab 400 more compact even with a longer total length. By making the length of the tab 400 relatively longer, the electrical performance of the tab 400 can be further improved, resulting in better charge and discharge performance of the battery of this application. By making the tab 400 more compact, the battery structure of this application can be made more compact, thereby increasing the battery capacity per unit volume.

[0068] In some implementations, reference Figure 6 As shown, the connector 220 of this application may include an overlapping portion 221 and a sealing portion 222, wherein one end of the overlapping portion 221 is connected to the sealing portion 222. The second tab section 420 of the tab 400 overlaps the overlapping portion 221, and at least a portion of the sealing portion 222 is set at an angle to the overlapping portion 221. The sealing portion 222 is located between the edge of the top cover 230 and the cover plate 210. By providing the sealing portion 222, the gap between the edge of the top cover 230 and the cover plate 210 can be filled and sealed, thereby preventing foreign objects from entering between the top cover 230 and the cover plate 210 and then into the housing 100, thus protecting the battery.

[0069] Specifically, the sealing part 222 can be arranged along the circumference of the top cover 230, so that the sealing part 222 is located between the circumferential edge of the top cover 230 and the cover plate 210, so that the gap between the circumferential edge of the top cover 230 and the cover plate 210 can be sealed.

[0070] In some implementations, reference Figure 6 As shown, the connector 220 of this application may further include a support portion 223, which is connected to the side of the sealing portion 222 opposite to the overlapping portion 221. The support portion 223 and the sealing portion 222 are set at an angle, and the support portion 223 is supported on the top cover 230. Specifically, one end of the support portion 223 is connected to the end of the sealing portion 222, and correspondingly, the surface of the support portion 223 with a larger surface area can contact the top cover 230 to support the top cover 230. This increases the contact area between the connector 220 and the top cover 230, making the connector 220 support the top cover 230 more effectively and the top cover 230 more stable.

[0071] The overlapping portion 221 and the sealing portion 222 can be arranged at a 90° angle, and the supporting portion 223 and the sealing portion 222 can also be arranged at a 90° angle. The overlapping portion 221 and the supporting portion 223 extend in opposite directions, and the overlapping portion 221, the sealing portion 222, and the supporting portion 223 can be an integral structure, which makes the connection between the overlapping portion 221, the sealing portion 222, and the supporting portion 223 more stable and reliable. Of course, the overlapping portion 221, the sealing portion 222, and the supporting portion 223 can also be manufactured separately and then connected by welding, and this application does not impose any restrictions on this.

[0072] In some embodiments, the overlapping portion 221 of this application has a length, width, and thickness. Specifically, the thickness of the overlapping portion 221 in a first direction is 0.2mm-2.5mm, the length of the overlapping portion 221 in a second direction is 50mm-100mm, and the width of the overlapping portion 221 in a third direction is 5mm-10mm. The first direction is the overlapping direction between the tab 400 and the overlapping portion 221, and the first, second, and third directions are mutually perpendicular. By ensuring that the length, width, and thickness of the overlapping portion 221 meet the aforementioned dimensions, the structure of the overlapping portion 221 can be made compact and appropriate, and the overlapping portion 221 can adequately support the second stage of the tab 400.

[0073] Specifically, the thickness of the overlapping portion 221 in the first direction can be set to 1 mm, the length of the overlapping portion 221 in the second direction is 75 mm, and the width of the overlapping portion 221 in the third direction is 7 mm.

[0074] In some implementations, reference Figure 7As shown, the top cover 230 of this application may be provided with a welding groove 231. The welding groove 231 is located on the side of the top cover 230 facing away from the second tab section 420 of the tab 400. The orthographic projection of the bottom wall of the welding groove 231 onto the tab 400 in the direction from the top cover 230 to the bottom cover is located within the tab 400. The portion of the top cover 230 located around the welding groove 231 may be disposed opposite to the sealing portion 222 and the support portion 223 of the connector 220. Accordingly, when welding the top cover 230, the tab 400 and the connector 220, penetration welding can be started from the bottom wall of the welding groove 231 to weld the top cover 230, the tab 400 and the connector 220. Accordingly, the welded part 500 extends from the bottom wall of the welding groove 231 toward the connector 220.

[0075] By providing a welding groove 231 on the top cover 230, the thickness of the welding part of the top cover 230 can be reduced. This allows for more efficient penetration of the top cover 230 to the tab 400 and the connector 220 during welding, thereby improving the welding efficiency of the top cover 230, the tab 400 and the connector 220.

[0076] In some implementations, reference Figures 4 to 5 As shown, the end cap assembly 200 of this application may further include a first insulating member 240, which is located between the support portion 223 of the connector 220 and the cover plate 210. Specifically, there is a gap between the support portion 223 of the connector 220 and the cover plate 210, and the first insulating member 240 is located in the space between the support portion 223 and the cover plate 210, thus insulating and separating the support portion 223 from the cover plate 210.

[0077] Specifically, to ensure the cover plate 210 has good structural strength for sealing the mounting opening 120 of the housing 100, the cover plate 210 is a metal structural component. The connector 220 is also a metal component so that it can be welded to the tab 400. By providing the first insulating component 240, electrical connection between the connector 220 and the cover plate 210 can be prevented, thereby preventing battery short circuits and protecting the battery.

[0078] In addition, the first insulating member 240 also surrounds at least a portion of the sealing portion 222 of the connector 220, so that the first insulating member 240 can also seal the area between the top cover 230 and the cover plate 210, thereby further improving the sealing performance of the battery of this application and making the battery safer and more reliable.

[0079] In some implementations, reference Figures 4 to 5As shown, the cover plate 210 of this application has a second opening for the tab 400 to pass through. The second end of the tab 400 passes through the second opening to the outside of the cavity 110 of the housing 100. The second insulating member 250 is located between the tab 400 and the inner wall of the second opening. The second insulating member 250 can separate the tab 400 from the inner wall of the second opening. The second insulating member 250 can prevent the tab 400 from contacting the cover plate 210 when it passes through the second opening, thus achieving the purpose of insulating and separating the tab 400 from the cover plate 210 and preventing the battery from short-circuiting.

[0080] Specifically, the second insulating member 250 can be arranged circumferentially along the second opening of the cover plate 210, so that the second insulating member 250 can completely separate the part of the tab 400 that passes through the second opening from the inner wall of the second opening, thus fully preventing the tab 400 from directly contacting the cover plate 210.

[0081] In some implementations, reference Figure 8 As shown, the second insulating member 250 of this application may include an insulating partition 251 and an insulating connecting portion 252. The insulating partition 251 is connected to the insulating connecting portion 252, and the insulating partition 251 is located between the tab 400 and the inner wall of the second opening. The insulating connecting portion 252 and the insulating partition 251 are arranged at an angle, and the insulating connecting portion 252 is fastened to the side of the cover plate 210 facing away from the top cover 230. Specifically, the insulating connecting portion 252 is located within the cavity 110 of the housing 100, and the insulating partition 251 passes through the second opening of the cover plate 210. By providing the insulating connecting portion 252, the second insulating member 250 can be reliably connected to the cover plate 210, enhancing the stability of the second insulating member 250.

[0082] In some implementations, reference Figures 4 to 5 As shown, the cover plate 210 assembly of this application may further include a support member 260, which is located between the cover plate 210 and the first insulating member 240. The support member 260 can fill the gap between the cover plate 210 and the first insulating member 240, so that the first insulating member 240 and the cover plate 210 are relatively fixed and the connection between the two is stable.

[0083] In some embodiments, the first insulating element 240 in this application may be made of ceramic, and the second insulating element 250 may be made of plastic.

[0084] In some implementations, reference Figures 3 to 5As shown, this application has two end cap assemblies 200 and two tabs 400. The two tabs 400 are respectively connected to both ends of the electrode core 300. The housing 100 has two mounting ports 120, both of which communicate with the cavity 110, and are located on both sides of the housing 100. Two end cap assemblies 200 are respectively disposed in the two mounting ports 120 of the housing 100, and the two tabs 400 are respectively connected to the two end cap assemblies 200.

[0085] Specifically, the second ends of the two tabs 400, which are away from the pole core 300, pass through the two mounting ports 120 respectively, and the second tab sections 420 of the two tabs 400 are located between the connectors 220 and the top cover 230 in the two end cover assemblies 200 respectively. The top cover 230, the second tab sections 420 and the connectors 220 are welded together to form two welded parts 500.

[0086] Among them, the two tabs 400 are positive tab 400a and negative tab 400b, respectively. Correspondingly, the top covers 230 of the two end cover assemblies 200 can respectively constitute the positive terminal and negative terminal of the battery. The two top covers 230 of the battery can be connected to an external power device or charging device so that the battery can be charged and discharged.

[0087] In some implementations, reference Figure 4 As shown, the battery of this application may also include a connection terminal 270, which can be disposed on the top cover 230 of the end cover assembly 200 corresponding to the negative electrode tab 400b. Specifically, the connection terminal 270 can be disposed within the welding groove 231 of the top cover 230, so that the connection terminal 270 can utilize the space within the welding groove 231, making the structure of the end cover assembly 200 more compact, and correspondingly, making the structure of the battery of this application more compact.

[0088] In some embodiments, the top cover 230 and connector 220 in the end cap assembly 200 corresponding to the positive electrode tab 400a are made of the same material as the positive electrode tab 400a. This results in better welding of the second electrode tab section 420 of the positive electrode tab 400a to the corresponding top cover 230 and connector 220, making the connection between the positive electrode tab 400a and the corresponding top cover 230 and connector 220 more stable.

[0089] The top cover 230 and connector 220 in the end cap assembly 200 corresponding to the negative electrode tab 400b are made of the same material as the negative electrode tab 400b. This results in a better welding effect between the second electrode tab section 420 of the negative electrode tab 400b and the corresponding top cover 230 and connector 220, making the connection between the negative electrode tab 400b and the corresponding top cover 230 and connector 220 more stable.

[0090] Specifically, the positive electrode tab 400a can be made of aluminum, and correspondingly, the top cover 230 and connector 220 corresponding to the positive electrode tab 400a are also made of aluminum. The negative electrode tab 400b can be made of copper, and correspondingly, the top cover 230 and connector 220 corresponding to the negative electrode tab 400b are also made of copper.

[0091] Based on the battery described above, this application also proposes a battery pack comprising multiple batteries as described above. The multiple batteries can be stacked along the thickness direction of the batteries, and the multiple batteries can be connected in series.

[0092] Based on the battery or battery pack described above, this application also proposes an electrical device that includes the battery or battery pack described above. This electrical device can be a new energy vehicle, an energy storage cabinet, or a robot; this application does not limit the specific type of electrical device.

[0093] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0094] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0095] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0096] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery, characterized by, include: The housing (100) has a cavity (110) and a mounting port (120) communicating with the cavity (110); An end cap assembly (200) includes a cover plate (210), a connector (220), and a top cover (230), wherein the cover plate (210) is disposed at the mounting opening (120) to block at least a portion of the mounting opening (120), the connector (220) is disposed on the cover plate (210), and the top cover (230) is located on the side of the connector (220) facing away from the cover plate (210); The electrode core (300) is disposed within the cavity (110); A tab (400) is provided, the first end of which is connected to the electrode core (300), the second end of which passes through the cover plate (210), the portion of the tab (400) adjacent to the second end overlaps the side of the connector (220) facing away from the cover plate (210), and the top cover (230) is pressed onto the side of the tab (400) facing away from the connector (220). The top cover (230), the portion of the tab (400) near the second end, and the connector (220) are welded together to form a weldment (500) passing through the top cover (230), the portion of the tab (400) near the second end, and the connector (220).

2. The battery of claim 1, wherein, The electrode tab (400) includes a first electrode tab segment (410) and a second electrode tab segment (420). The first electrode tab segment (410) is connected to the electrode core (300). The second electrode tab segment (420) is connected to the end of the first electrode tab segment (410) away from the electrode core (300). The second electrode tab segment (420) overlaps the side of the connector (220) facing away from the cover plate (210) and is perpendicular to the first electrode tab segment (410).

3. The battery of claim 2, wherein, The tab (400) further includes a third tab segment (430) and a fourth tab segment (440). The third tab segment (430) is connected to the end of the first tab segment (410) away from the pole core (300), and the third tab segment (430) is opposite to the side of the connector (220) away from the second tab segment (420). One end of the fourth tab segment (440) is connected to the end of the third tab segment (430) away from the first tab segment (410), and the other end of the fourth tab segment (440) is connected to the second tab segment (420). The fourth tab segment (440) is opposite to the sidewall of the connector (220).

4. The battery of claim 1, wherein, The connector (220) includes an overlapping portion (221) and a sealing portion (222). One end of the overlapping portion (221) is connected to the sealing portion (222). The tab (400) overlaps the overlapping portion (221). The sealing portion (222) is set at an angle to the overlapping portion (221) so that the sealing portion (222) is opposite to the outer wall of the top cover (230).

5. The battery of claim 4, wherein, The connector (220) further includes a support (223), which is connected to the sealing part (222) on the side away from the overlapping part (221). The support (223) is located between the cover plate (210) and the top cover (230), and the support (223) is supported by the top cover (230).

6. The battery of claim 5, wherein, The thickness of the overlapping portion (221) in the first direction is 0.2mm-2.5mm, the length of the overlapping portion (221) in the second direction is 50mm-100mm, and the width of the overlapping portion (221) in the third direction is 5mm-10mm. Wherein, the first direction is the overlapping direction of the tab (400) and the overlapping part (221), and the first direction, the second direction and the third direction are perpendicular to each other.

7. The battery of claim 6, wherein, The end cap assembly (200) further includes a first insulating member (240) located between the support portion (223) and the cover plate (210) to insulate the support portion (223) from the cover plate (210).

8. The battery of claim 7, wherein, The end cap assembly (200) further includes a second insulating member (250) disposed between the pole core (300) and the cover plate (210) to insulate and separate the pole core (300) from the cover plate (210).

9. The battery of claim 8, wherein, The cover plate (210) has a second opening through which the tab (400) passes, and a portion of the second insulating member (250) passes through the second opening and is fastened to the cover plate (210).

10. The battery of claim 9, wherein, The cover plate (210) assembly also includes a support member (260), which is disposed between the cover plate (210) and the first insulating member (240), and the second insulating member (250) is fastened to the support member (260).

11. The battery of any one of claims 8-10, wherein, The first insulating component (240) is a ceramic component, and the second insulating component (250) is a plastic component.

12. The battery of claim 1, wherein, The top cover (230) has a welding groove (231) on the side opposite to the tab (400), and the welded part (500) passes through the bottom wall of the welding groove (231).

13. The battery of any one of claims 1-10, wherein, The number of end cap assemblies (200) and the number of electrode tabs (400) are both two. The two electrode tabs (400) are respectively connected to opposite sides of the electrode core (300). The housing (100) has two mounting ports (120). The two end cap assemblies (200) are respectively disposed in the two mounting ports (120). The two electrode tabs (400) are respectively welded to the two end cap assemblies (200).

14. The battery of claim 13, wherein, The battery also includes a connection terminal (270), and the two tabs (400) include a positive tab (400a) and a negative tab (400b). The connection terminal (270) is disposed on the top cover (230) of the end cover assembly (200) corresponding to the negative tab (400b).

15. The battery of claim 14, wherein, The connecting piece (220) of the end cover assembly (200) corresponding to the positive electrode lug (400a) is an aluminum structural piece, and the connecting piece (220) of the end cover assembly (200) corresponding to the negative electrode lug (400b) is a copper structural piece.

16. A battery pack, characterized by A battery comprising the battery cell of any one of claims 1-15.

17. An electrical device, characterized by A battery pack comprising the battery cell of any one of claims 1-15, or the battery pack of claim 16.

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