Battery, battery device and electric equipment

Abstract

The utility model discloses a battery, battery device and electric equipment, battery includes: pole core, first current collector and second current collector, pole core includes pole ear, first current collector is welded with pole ear, first current collector is provided between pole ear and second current collector, first current collector and second current collector are electrically connected, second current collector is provided between pole ear and second current collector. The second current collector is suitable for being electrically connected with the conductive terminal to lead out the electrode. Therefore, the first current collecting piece can be directly connected with the tab in a welding manner, and any area of the first current collecting piece can be welded as required to increase the overflowing area, reduce the impedance and prevent local overheating, so that the fast charging performance of the battery is improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery, a battery device and an electrical equipment. Background Art

[0002] In the prior art, the cover plate structure of a battery includes a cover plate, a sealing ring, a spacer, a current collector plate and a conductive post. Among them, the spacer is arranged between the cover plate and the current collector plate, and the spacer will cover a part of the area of the current collector plate. The conductive post is electrically connected to the tab through the current collector plate to lead out current. When welding the tab and the current collector plate in this structure, only the exposed part of the current collector plate can be welded, which will increase the impedance of the whole battery cell, affect the fast charging performance of the battery, and is not conducive to improving the product competitiveness. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the first object of the utility model is to provide a battery, which is beneficial to reducing the impedance of the battery cell, improving the fast charging performance and the overall life of the battery.

[0004] The second object of the utility model is to provide a battery device including the battery described in the above embodiment.

[0005] The third object of the utility model is to provide an electrical equipment including the battery device or the battery described in the above embodiment.

[0006] The battery according to the first aspect embodiment of the utility model includes: a battery core, a first current collector and a second current collector. The battery core includes tabs. The first current collector is welded to the tab. The first current collector is arranged between the tab and the second current collector. The first current collector and the second current collector are electrically connected. The second current collector is adapted to be electrically connected to a conductive terminal to lead out an electrode.

[0007] For the battery according to the embodiment of the utility model, the first current collector can be directly welded to the tab first, and then the second current collector is assembled with the cover plate, the sealing ring, the spacer and the conductive terminal of the battery, and then the current is transmitted through the electrical connection between the second current collector and the first current collector. At this time, any area of the first current collector can be welded as needed to increase the current-carrying area between the first current collector and the tab, reduce the impedance and prevent local overheating, so as to improve the fast charging performance and the life of the battery.

[0008] In some embodiments, the first current collector includes a first disk body, and the second current collector includes a second disk body. The second disk body is welded to the first disk body.

[0009] In some embodiments, the two opposite side surfaces of the second disk body are welded to the first disk body.

[0010] In some embodiments, the second disk body is at least partially welded to the circumferential edge of the first disk body.

[0011] In some embodiments, one of the first disk body and the second disk body is provided with a flanging, the flanging extends circumferentially, and the other of the first disk body and the second disk body is welded to the flanging.

[0012] In some embodiments, the first current collector includes a first disk body, the second current collector includes a second disk body, one of the first disk body and the second disk body is provided with a flanging, the flanging extends circumferentially, at least one opening is formed in the flanging, and at least one limiting portion is provided on the other of the first disk body and the second disk body, and the limiting portion is in limiting cooperation with the corresponding opening.

[0013] In some embodiments, at least one first weld seam is formed by welding the first disk body and the tab, at least one second weld seam is formed by welding the second disk body and the first disk body, and the second weld seam and the first weld seam are arranged at intervals.

[0014] In some embodiments, a plurality of the first weld seams extend along the radial direction of the first disk body.

[0015] In some embodiments, a plurality of the first weld seams are arranged at intervals along the circumferential direction of the first disk body.

[0016] In some embodiments, at least one first through hole is formed in the first disk body, and two adjacent first weld seams are arranged on both sides of the first through hole.

[0017] In some embodiments, a second through hole is formed in the first disk body, the second through hole is arranged between the ends of a plurality of the first weld seams away from the edge of the first disk body, and the second through hole is arranged at intervals from the ends of a plurality of the first weld seams away from the edge of the first disk body.

[0018] In some embodiments, a plurality of the second weld seams all extend along the circumferential direction of the second disk body and are arranged at intervals.

[0019] In some embodiments, at least one third through hole is formed in the second disk body, the third through hole extends along the circumferential direction of the second disk body, and the third through hole and at least one of the first through holes are axially opposite along the battery.

[0020] In some embodiments, the second current collector further includes: a current-carrying connecting portion, one end of the current-carrying connecting portion is connected to the second disk body, the other end of the current-carrying connecting portion extends along the radial direction of the second disk body, and the third through hole is defined between the current-carrying connecting portion and the second disk body.

[0021] In some embodiments, a fourth through hole is formed at the other end of the overcurrent connection portion, and the fourth through hole is adapted to be electrically connected to a conductive terminal to lead out an electrode.

[0022] In some embodiments, the battery further includes a conductive terminal configured as a pole post, and the pole post is provided with a mating portion that is welded to the fourth through hole.

[0023] In some embodiments, the first current collector includes a first disk body, the second current collector includes a second disk body, and the second disk body is bonded to the first disk body.

[0024] In some embodiments, the height of the flange along the axial direction is greater than or equal to the height of the other one of the first battery and the second current collector along the axial direction.

[0025] In some embodiments, it further includes: an insulating member disposed between the first disk body and the overcurrent connection portion.

[0026] In some embodiments, the first current collector and the second current collector have different thicknesses.

[0027] In some embodiments, the first current collector is a copper member and the second current collector is an aluminum member.

[0028] The battery device according to the second aspect embodiment of the present invention includes the battery according to the first aspect embodiment of the present invention above.

[0029] The electrical equipment according to the third aspect embodiment of the present invention includes the battery device according to the second aspect embodiment of the present invention above, or the battery according to the first aspect embodiment of the present invention above.

[0030] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0031] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0032] Figure 1 is a partial schematic diagram of the battery according to the embodiment of the present invention.

[0033] Figure 2 is an exploded schematic diagram of the first current collector and the second current collector according to the embodiment of the present invention.

[0034] Figure 3 is a schematic diagram of the first current collector according to the embodiment of the present invention.

[0035] Figure 4 It is a schematic diagram of the second current collector according to an embodiment of the present invention.

[0036] Figure 5 It is a schematic diagram of the terminal post according to an embodiment of the present invention.

[0037] Figure 6 It is an assembly schematic diagram of the first current collector and the second current collector according to an embodiment of the present invention.

[0038] Figure 7 It is a cross-sectional schematic diagram after the first current collector and the second current collector are assembled according to an embodiment of the present invention.

[0039] Reference numerals:

[0040] 100, battery;

[0041] 10, first current collector; 11, first disk body; 12, first through hole; 13, second through hole; 14, first weld seam; 15, second weld seam; 16, flanging;

[0042] 20, second current collector; 21, second disk body; 22, third through hole; 23, current-carrying connection part; 24, fourth through hole; 26, limiting part;

[0043] 30, terminal post; 31, mating part; 32, electrode core; 33, tab;

[0044] 40, insulating part. Detailed implementation manners

[0045] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the drawings are exemplary. Below, reference is made to Figures 1-7 Describe the battery 100 according to an embodiment of the present invention, including: an electrode core 32, a first current collector 10, and a second current collector 20.

[0046] Specifically, as Figures 1-7 shown, the electrode core 32 includes a tab 33. The first current collector 10 is welded to the tab 33. The first current collector 10 is disposed between the tab 33 and the second current collector 20. The first current collector 10 and the second current collector 20 are electrically connected. The second current collector 20 is adapted to be electrically connected to a conductive terminal to lead out an electrode.

[0047] Combined with Figures 1-5, the electrode core 32 serves as the active material carrier of the battery 100 and is responsible for electrochemical reactions during charging and discharging to generate or consume electrons. The tab 33 is an extension of the electrode core 32, and the tab 33 is adapted to be directly connected to the first current collector 10. The first current collector 10 and the second current collector 20 are stacked, and the first current collector 10 and the second current collector 20 are electrically connected. The first current collector 10 is adapted to be welded to the electrode core 32 of the battery 100, and the first current collector 10 and the second current collector 20 are connected by welding or bonding.

[0048] For the battery 100 according to an embodiment of the present invention, the first current collector 10 can be directly welded to the tab 33 first, and then the second current collector 20 is assembled with the cover plate, sealing ring, spacer and conductive terminal of the battery 100, and then the current is transmitted through the electrical connection between the second current collector 20 and the first current collector 10. At this time, any area of the first current collector 10 can be welded as needed to increase the current-carrying area between the first current collector 10 and the tab 33, avoiding the thermal effect caused by the concentration of current in some areas, reducing the impedance between the tab 33 and the first current collector 10, preventing local overheating, and thus improving the fast charging performance and lifespan of the battery 100.

[0049] The first current collector 10 and the second current collector 20 are combined together in a stacked manner to form a multi-layer structure, which is convenient for the outflow of current. The multi-layer current collectors are tightly connected, which can enhance the stability and mechanical strength of the overall structure and reduce the risk of increased interruption of the conduction path caused by deformation. Especially when the battery 100 or capacitor undergoes volume changes during the charge and discharge cycle, the stable stacked structure can better maintain the continuity of electrical contact.

[0050] According to some embodiments of the present invention, as Figure 2 and Figure 3 shown, the first current collector 10 includes a first disk body 11, the second current collector 20 includes a second disk body 21, and the second disk body 21 is welded to the first disk body 11. The first disk body 11 and the second disk body 21 can provide a large surface area, which is beneficial to heat dissipation and reduces the phenomenon of local overheating. At the same time, the disk-shaped structure can increase the welding contact area with the tab 33, further reducing the contact resistance and improving the current transmission efficiency. The welding connection between the second disk body 21 and the first disk body 11 can enhance the overall connection strength between the first current collector 10 and the second current collector 20, enabling it to withstand a larger current load without being easily deformed. The welding connection between the first disk body 11 and the second disk body 21 ensures a highly reliable electrical contact and mechanical fixation. Compared with other connection methods, welding can form a more firm and low-impedance connection interface, which is helpful for the high-power output and long-term stable operation of the battery 100.

[0051] According to some embodiments of the present invention, as Figure 2 and Figure 3As shown, the two opposite side surfaces of the second disk body 21 are welded to the first disk body 11. By welding on the two opposite side surfaces of the second disk body 21 and the first disk body 11, the welding stress can be more evenly distributed, avoiding the risk of fracture caused by excessive force on a single welding point, thereby enhancing the stability and durability of the overall structure. Such a welding layout also helps the heat to dissipate faster from the welding area to the surroundings because the welding points are distributed over a larger area, contributing to heat management and reducing the possibility of local overheating.

[0052] According to some embodiments of the present invention, such as Figure 2 and Figure 3 As shown, at least a part of the circumferential edges of the second disk body 21 and the first disk body 11 are welded. The circumferential edge welding can effectively connect the outer peripheral edges of the first disk body 11 and the second disk body 21, which can significantly increase the overall rigidity and torsional resistance of the structure, preventing separation or deformation caused by external forces. The circumferential welding can disperse the welding stress over a large range, avoiding stress concentration and reducing the risk of cracking or fracture caused by excessive local stress, further enhancing the connection strength between the first disk body 11 and the second disk body 21.

[0053] According to some embodiments of the present invention, such as Figure 2 and Figure 3 As shown, one of the first disk body 11 and the second disk body 21 is provided with a flanging 16 that extends circumferentially, and the other of the first disk body 11 and the second disk body 21 is welded to the flanging 16.

[0054] The design of the flanging 16 extending circumferentially facilitates the welding between the first disk body 11 and the second disk body 21, can greatly improve the strength and durability of the welding part, and reduce the risk of welding detachment caused by vibration or external forces. The flanging 16 can provide a clear guiding structure to facilitate the alignment and fixation of the two disk bodies, reduce assembly errors, and improve production efficiency.

[0055] According to some embodiments of the present invention, such as Figures 2-4 As shown, the first current collector 10 includes the first disk body 11, the second current collector 20 includes the second disk body 21, one of the first disk body 11 and the second disk body 21 is provided with a flanging 16 that extends circumferentially, the flanging 16 is formed with at least one opening, and the other of the first disk body 11 and the second disk body 21 is provided with at least one limiting portion 26, and the limiting portion 26 is in limiting cooperation with the corresponding opening.

[0056] One of the first disk body 11 and the second disk body 21 includes a flanging 16 that extends circumferentially along the circumference of the battery 100, the flanging 16 is formed with at least one opening; the other of the first disk body 11 and the second disk body 21 includes a limiting portion 26, and the limiting portion 26 is provided on the outer peripheral side of the second disk body 21, and the limiting portion 26 cooperates with the corresponding opening.

[0057] For example, a flanging 16 is formed on the first disk body. The flanging 16 extends along the axial direction of the battery 100 towards the side where the second disk body 21 is located. The flanging 16 is formed on the outer peripheral edge of the first disk body 11. The flanging 16 is formed with a plurality of openings, and the plurality of openings are evenly spaced along the circumferential direction of the first current collector 10. A limiting portion 26 is formed on the second disk body 21. The limiting portion 26 is formed on the outer peripheral edge of the second disk body 21. The limiting portion 26 extends from a part of the edge of the second disk body 21 towards a direction away from the center of the second disk body 21 along the radial direction of the second disk body 21 and protrudes from the outer peripheral edge of the second disk body 21. The limiting portion 26 includes a plurality of them, and the plurality of limiting portions 26 are evenly spaced along the circumferential direction of the second disk body 21. The plurality of limiting portions 26 correspond to the plurality of openings one by one, and the limiting portion 26 is embedded in the opening.

[0058] Thus, the flanging 16 provided in the first current collector 10 or the second current collector 20 extends along the circumferential direction of the battery 100, which not only increases the edge strength of the current collector but also may provide a mechanism for positioning and fixing during assembly. At least one opening on the flanging 16 is adapted to match the limiting portion 26 on the second current collector 20, which helps to accurately align the positions of the two current collectors and ensure the consistency and repeatability of assembly. The mechanical interlocking structure between the limiting portion 26 and the opening ensures a stable axial and radial alignment between the two current collectors. Even when the battery 100 is subjected to mechanical stress or thermal expansion inside, it can maintain a good contact state and reduce the possibility of connection loosening. Through the cooperation of the flanging 16 and the limiting portion 26, not only can the simplicity and efficiency of the assembly process be improved, the error of manual operation be reduced, but also the stability of the battery 100 can be maintained throughout the entire life cycle of the battery 100, which is beneficial to maintaining the electrical performance of the battery 100, reducing the growth of internal resistance, and improving the safety of the battery 100.

[0059] According to some embodiments of the present invention, as Figures 2-4 shown, at least one first weld seam 14 is formed by welding the first disk body 11 and the tab 33, and at least one second weld seam 15 is formed by welding the second disk body 21 and the first disk body 11. The second weld seam 15 and the first weld seam 14 are arranged at intervals. The first weld seam 14 and the second weld seam 15 are arranged at intervals along the circumferential direction of the first disk body 11.

[0060] Thus, the spaced welds contribute to heat dissipation, avoiding heat accumulation at adjacent solder joints and preventing local overheating, thereby protecting the material from heat damage and improving the thermal stability of the battery 100. By dispersing the first weld 14 and the second weld 15, the stress concentration phenomenon caused by welding can be effectively reduced, and the risk of material fatigue or fracture due to stress accumulation can be lowered, enhancing the long-term reliability of the structure of the battery 100. The multi-point support structure formed by multiple welds can more evenly distribute the mechanical stress on the battery 100 during use or handling, enhancing the overall mechanical strength and durability.

[0061] According to some embodiments of the present invention, as Figure 2 and Figure 3 shown, the first weld 14 extends along the radial direction of the first disk body 11, and multiple first welds 14 are arranged at intervals along the circumferential direction of the first disk body 11. The first disk body 11 can be formed into a disk-shaped structure, and the first weld 14 extends from the center of the first disk body 11 to the outer edge of the first disk body 11. The first current collector 10 is electrically connected to the electrode core 32 of the battery 100 through the first weld 14 to achieve current conduction between the battery core and the battery 100. Multiple first welds 14 are evenly arranged at intervals along the circumferential direction of the first disk body 11 on the first disk body 11, increasing the contact area between the first disk body 11 and the electrode core 32, thereby reducing the internal resistance of the electrode core 32 and reducing the risk of local overheating and electrode damage.

[0062] Thus, the first weld 14 is suitable for providing electrical contact points for the connection between the first current collector 10 and the electrode core 32. The extension of the first weld 14 along the radial direction of the first disk body 11 helps to ensure that the current at different radius positions can be effectively collected and guided to the battery 100, thereby improving the efficiency and uniformity of current transmission. The electrical connection between the first current collector 10 and the electrode core 32 through the first weld 14 is beneficial to ensuring good electrical continuity between the first current collector 10 and the electrode core 32, reducing the contact resistance, and further reducing the internal resistance of the electrode core 32. The layout of multiple first welds 14 helps to achieve balanced collection and transmission of current in the circumferential direction of the first disk body 11, ensuring the uniformity of current conduction. The spaced arrangement can also enhance the stability and reliability of the structure, enabling each first weld 14 to independently bear a part of the current, and improving the overall current conduction capacity and stability of the battery 100.

[0063] According to some embodiments of the present invention, as Figure 2 and Figure 3As shown, the first disk body 11 is formed with at least one first through hole 12, and two adjacent first weld seams 14 are arranged on both sides of the first through hole 12. The first through hole 12 penetrates the first disk body 11 along the thickness direction of the first disk body 11. Thus, the setting of the first through hole 12 can provide a certain deformation space for the battery 100. Especially when the material volume changes during the charging and discharging process of the battery 100, it helps to reduce the internal stress and prevent structural damage. The first through hole 12 can be used to quickly infiltrate the electrolyte or serve as an exhaust channel inside the battery 100, which helps to improve the working safety of the battery 100 and extend the service life of the battery 100.

[0064] According to some embodiments of the present invention, as Figure 2 and Figure 3 shown, the first disk body 11 is formed with a second through hole 13. The second through hole 13 is arranged between the ends of a plurality of first weld seams 14 away from the edge of the first disk body 11, and the second through hole 13 and the ends of the plurality of first weld seams 14 away from the edge of the first disk body 11 are both arranged at intervals.

[0065] The second through hole 13 is arranged at the center of the first disk body 11. The second through hole 13 penetrates the first disk body 11 along the thickness direction of the first disk body 11. One end of the first weld seam 14 is adjacent to the second through hole 13, and the other end of the first weld seam 14 extends away from the second through hole 13 and towards the edge of the first disk body 11. Along the radial direction of the first disk body 11, one end of the first through hole 12 is arranged at an interval from the second through hole 13, and the other end of the first through hole 12 is arranged at an interval from the edge of the first disk body 11. Along the circumferential direction of the first disk body 11, the first through hole 12 is arranged between two adjacent first weld seams 14.

[0066] Thus, the second through hole 13 is used for the rapid flow of the electrolyte and the exhaust channel after the core generates gas. The setting of the second through hole 13 facilitates the assembly of the battery 100. The layout of the first through hole 12, the second through hole 13 and the first weld seams 14 on the first disk body 11 helps to strengthen the structural strength of the first current collector 10, reduce the weight of the first current collector 10, optimize the current collection path, and further optimize the electrical performance, thermal stability and long-term use reliability of the battery 100.

[0067] According to some embodiments of the present invention, as Figure 2 and Figure 3 shown, a plurality of second weld seams 15 extend along the circumferential direction of the second disk body 21 and are arranged at intervals. The second weld seams 15 are arranged along the circumferential direction of the second disk body 21 between two adjacent first weld seams 14, and the second weld seams 15 are located on the side away from the center of the second disk body 21 along the radial direction of the second disk body 21. Along the circumferential direction of the second disk body 21, the second weld seams 15 are arranged between two adjacent first weld seams 14, and the first weld seams 14 and the second weld seams 15 do not interfere with each other.

[0068] Accordingly, the second weld seam 15 is arranged circumferentially along the second disk body 21, which helps to distribute the current more evenly in the circumferential direction, improve the efficiency of current collection and distribution of the battery 100. The second weld seam 15 is beneficial to optimizing the current path, while enhancing the symmetry and mechanical stability of the internal structure of the battery 100, ensuring that the current can still be effectively transmitted when passing through the through-hole area. The first weld seam 14 and the second weld seam 15 are alternately and spaced apart, further refining the current collection network, ensuring that the current can pass through the first current collector 10 more evenly from all directions, reducing local overheating and increased resistance caused by current concentration, and also improving the structural stability and design flexibility of the battery 100. The second weld seam 15 is suitable for connecting with the second current collector 20, which helps to enhance the connection strength between the first current collector 10 and the second current collector 20, and improve the reliability of the battery 100.

[0069] According to some embodiments of the present invention, as Figure 2 and Figure 4 shown, the second disk body 21 is formed with at least one third through-hole 22, the third through-hole 22 extends circumferentially along the second disk body 21, and the third through-hole 22 is axially opposite to at least one of the plurality of first through-holes 12 along the battery 100. The third through-hole 22 extends circumferentially along the second disk body 21, and the third through-hole 22 is formed as an incomplete annular structure. Along the thickness direction of the battery 100, the third through-hole 22 is disposed opposite to the first through-hole 12.

[0070] Accordingly, the aligned third through-hole 22 and the first through-hole 12 help to form a continuous channel between the first current collector 10 and the second current collector 20, promote the unobstructed flow of the electrolyte, enable the electrolyte to quickly infiltrate the battery 100, and can also serve as an exhaust channel inside the battery core, improving the safety of the battery 100. Through the precisely aligned through-hole design, the penetration depth and distribution of the electrolyte in the electrode material can be more precisely controlled, thereby promoting the uniformity of the electrochemical reaction and improving the overall performance and service life of the battery 100.

[0071] According to some embodiments of the present invention, as Figure 2 and Figure 4 shown, the second current collector 20 further includes: a current-carrying connection portion 23, one end of the current-carrying connection portion 23 is connected to the second disk body 21, the other end of the current-carrying connection portion 23 extends radially from the outside to the inside along the second disk body 21, and the third through-hole 22 is defined between the current-carrying connection portion 23 and the second disk body 21.

[0072] The current-carrying connection portion 23 extends radially along the second disk body 21, one end of the current-carrying connection portion 23 is disposed at the center of the second disk body 21, and the other end of the current-carrying connection portion 23 extends radially to the edge of the second disk body 21 along the second disk body 21.

[0073] Thus, the overcurrent connection part 23 can provide additional mechanical support for the battery 100. Especially during the charging and discharging process of the battery 100, it helps to maintain the shape stability of the current collector, preventing deformation or fracture caused by stress concentration. As a conductive structure, the overcurrent connection part 23 directly participates in the current conduction process, which can ensure that the current path is more direct and efficient during the process of leading out from the second disk body 21 to the outside, reduce the resistance, prevent heat accumulation in case of overcurrent, and protect the safety of the battery 100.

[0074] According to some embodiments of the present invention, as Figure 2 and Figure 4 shown, the other end of the overcurrent connection part 23 is formed with a fourth through hole 24, and the fourth through hole 24 is adapted to be electrically connected to a conductive terminal to lead out the electrode.

[0075] The fourth through hole 24 penetrates through one end of the overcurrent connection part 23 located at the center of the second disk body 21 along the thickness direction of the second disk body 21. The fourth through hole 24 and the second through hole 13 are oppositely arranged along the thickness direction of the battery 100, and the central axes of the fourth through hole 24 and the second through hole 13 coincide. The adaptation of the fourth through hole 24 to be connected to the conductive terminal ensures a direct and reliable electrical interface between the inside and the outside circuit of the battery 100. This design simplifies the assembly process of the battery 100, reduces the connection links, reduces the contact resistance, and thus improves the electric energy transmission efficiency.

[0076] Thus, the design of the axially opposite fourth through hole 24 and the second through hole 13 ensures the alignment of the first current collector 10 and the second current collector 20 after assembly, helps to maintain the assembly of the internal structure of the battery 100, reduces the assembly error, and improves the stability and reliability of the overall structure. The alignment of the fourth through hole 24 and the second through hole 13 provides a direct path for the electrolyte to penetrate through the entire battery 100. This design can promote the uniform distribution and effective circulation of the internal liquid.

[0077] According to some embodiments of the present invention, as Figure 1 and Figure 5 shown, the battery 100 further includes a conductive terminal, and the conductive terminal is configured as a pole post 30. The pole post 30 is provided with a mating part 31, and the mating part 31 is welded to the fourth through hole 24.

[0078] The terminal post 30 is responsible for conducting the current inside the battery 100 to the external circuit in the battery 100. The mating part 31 on the terminal post 30 is precisely mated with the fourth through-hole 24 on the second current collector 20, ensuring good electrical contact between the electrode and the terminal post 30, reducing the contact resistance. At the same time, it also facilitates the installation and fixation of the terminal post 30, improving the convenience and reliability of the assembly of the battery 100. One end of the terminal post 30 is welded to the fourth through-hole 24, which can enhance the firmness of the fit between the terminal post 30 and the battery 100. The terminal post 30 and the second current collector 20 are fixed together by welding. This connection method can provide a firm mechanical bond and a low-resistance electrical connection, ensuring that the connection between the terminal post 30 and the current collector remains stable throughout the entire life cycle of the battery 100, unaffected by temperature changes or mechanical vibrations, further enhancing the durability and safety of the battery 100.

[0079] According to some embodiments of the present invention, as Figures 2-4 shown, the height of the flanging 16 along the axial direction of the battery 100 is greater than or equal to the height of the other one of the first battery 100 and the second current collector 20 along the axial direction of the battery 100. The flanging 16 extends circumferentially around the current collector, and its axial dimension can completely cover or at least be flush with the edge of the other current collector. Thus, the height of the flanging 16 is sufficient to match or be higher than the height of the other current collector, ensuring that after the two current collectors are assembled, there is a reliable physical connection between the first current collector 10 and the second current collector 20, and it is not easy to be misaligned or separated due to external forces, enhancing the overall structural strength and structural stability of the battery 100.

[0080] According to some embodiments of the present invention, as Figure 6 and Figure 7 shown, it further includes: an insulating member 40, and the insulating member 40 is disposed between the first disk body 11 and the current-carrying connection portion 23.

[0081] Along the thickness direction of the battery 100, the insulating member 40 is disposed between the first current collector 10 and the current-carrying connection portion 23 of the second current collector 20. Its main function is to ensure electrical separation between the first current collector 10 and the second current collector 20, prevent the current from being conducted due to the contact between the first current collector 10 and the second current collector 20, prevent short circuits, effectively prevent accidental contact between the electrodes, reduce the risk of short circuit of the battery 100, and thus improve the overall safety performance of the battery 100.

[0082] According to some embodiments of the present utility model, the thicknesses of the first current collector 10 and the second current collector 20 are different. Current collectors with different thicknesses can optimize the electric field distribution inside the battery 100 to ensure uniform conduction of current in different regions. For example, a current collector with a larger thickness may carry a larger current, reducing resistance and heat generation, while a thinner current collector is used in places where higher flexibility or adaptation to a specific structure is required. By adjusting the thickness of the current collector, the requirements for the mechanical strength and weight of the battery 100 can be balanced. A thicker current collector provides better mechanical support and stability, suitable for withstanding the internal pressure of the battery 100 or external mechanical stress, while the thinner part may be used in designs that require bending or adaptation to complex geometric structures.

[0083] According to some embodiments of the present utility model, the first current collector 10 is a copper piece and the second current collector 20 is an aluminum piece. The electrical conductivity and thermal conductivity of copper are much higher than those of aluminum. As the first current collector 10, the copper piece can conduct current more efficiently, reduce energy loss, and at the same time can quickly dissipate heat to control the temperature rise when the battery 100 is working. Although the electrical conductivity of aluminum is slightly lower, its thermal conductivity is better. As the second current collector 20, it can effectively assist in thermal management and has a lower cost. Selecting aluminum as the second current collector 20 can reduce the weight of the battery 100 without significantly sacrificing the electrical conductivity, which is beneficial to achieving the lightweight and low cost of the battery 100. A dense oxide film is easily formed on the surface of aluminum, which has good corrosion resistance and can reduce the erosion of the current collector by electrochemical reactions, prolonging the service life of the battery 100. Thus, the first current collector 10 being a copper piece and the second current collector 20 being an aluminum piece can not only ensure the high performance and high efficiency of the battery 100, but also control the production cost of the battery 100 and improve the processing convenience of the battery 100.

[0084] The battery device according to the embodiment of the second aspect of the present utility model includes the battery 100 in the above embodiment.

[0085] According to the battery device of the embodiment of the present utility model, by applying the battery 100 in the above embodiment, the stability and reliability of the battery device can be improved, the safety during the use of the battery device can be enhanced, and the service life of the battery device can be prolonged.

[0086] The electrical equipment according to the embodiment of the third aspect of the present utility model includes the battery device in the above embodiment, or the battery 100.

[0087] According to the electrical equipment of the embodiment of the present utility model, by applying the battery device or the battery 100 in the above embodiment, the electrical equipment can achieve more efficient energy conversion and transmission, improve the battery life and response speed of the equipment, and effectively prevent safety hazards such as short circuits and overheating during the use of the electrical equipment, ensuring user safety.

[0088] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0089] In the description of the present utility model, the "first feature" and "second feature" may include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more. In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. In the description of the present utility model, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0090] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0091] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery, characterized in that, Comprising: A core, the core including a tab; A first current collector, the first current collector being welded to the tab; A second current collector, the first current collector being disposed between the tab and the second current collector, the first current collector and the second current collector being electrically connected, and the second current collector being adapted to be electrically connected to a conductive terminal to lead out an electrode.

2. The battery according to claim 1, wherein The first current collector includes a first disk body, the second current collector includes a second disk body, and the second disk body is welded to the first disk body.

3. The battery according to claim 2, characterized in that, The second disk body is welded to two opposite side surfaces of the first disk body.

4. The battery according to claim 2, wherein, The second disk body is at least partially welded to the circumferential edge of the first disk body.

5. The battery according to claim 2, wherein One of the first disk body and the second disk body is provided with a flanging, the flanging extending circumferentially, and the other of the first disk body and the second disk body is welded to the flanging.

6. The battery according to claim 1, characterized in that, The first current collector includes a first disk body, the second current collector includes a second disk body, one of the first disk body and the second disk body is provided with a flanging, the flanging extending circumferentially, at least one opening is formed in the flanging, and at least one limiting portion is provided on the other of the first disk body and the second disk body, and the limiting portion is in limiting cooperation with the corresponding opening.

7. The battery according to any one of claims 2-6, characterized in that, At least one first weld seam is formed by welding the first disk body and the tab, at least one second weld seam is formed by welding the second disk body and the first disk body, and the second weld seam and the first weld seam are arranged at intervals.

8. The battery according to claim 7, characterized in that, A plurality of the first weld seams all extend along the radial direction of the first disk body, and the plurality of first weld seams are arranged at intervals along the circumferential direction of the first disk body.

9. The battery according to claim 8, characterized in that, At least one first through hole is formed in the first disk body, and two adjacent first weld seams are disposed on both sides of the first through hole.

10. The battery according to claim 8, characterized in that, A second through hole is formed in the first disk body, the second through hole is disposed between the ends of the plurality of first weld seams away from the edge of the first disk body, and the second through hole is spaced from the ends of the plurality of first weld seams away from the edge of the first disk body.

11. The battery according to claim 7, characterized in that, A plurality of the second weld seams all extend along the circumferential direction of the second disk body and are arranged at intervals.

12. The battery according to claim 9, wherein At least one third through hole is formed in the second disk body, the third through hole extends along the circumferential direction of the second disk body, and the third through hole is axially opposite to at least one of the first through holes along the axis of the battery.

13. The battery according to claim 12, characterized in that, The second current collector further includes: An overcurrent connection portion, one end of the overcurrent connection portion being connected to the second disk body, the other end of the overcurrent connection portion extending along the radial direction of the second disk body, and the overcurrent connection portion and the second disk body defining the third through hole therebetween.

14. The battery according to claim 13, characterized in that, A fourth through hole is formed at the other end of the overcurrent connection portion, and the fourth through hole is adapted to be electrically connected to a conductive terminal to lead out an electrode.

15. The battery according to claim 14, characterized in that, The battery further includes a conductive terminal, the conductive terminal is configured as a pole column, and the pole column is provided with a mating portion, and the mating portion is welded to the fourth through hole.

16. The battery according to claim 1, wherein, The first current collector includes a first disk body, the second current collector includes a second disk body, and the second disk body is bonded to the first disk body.

17. The battery according to claim 5 or 6, characterized in that, The height of the flanging along the axial direction is greater than or equal to the height of the other of the first current collector and the second current collector along the axial direction.

18. The battery according to claim 13, characterized in that, Further comprising: An insulating member, the insulating member being disposed between the first disk body and the overcurrent connection portion.

19. The battery according to any one of claims 1-6, characterized in that, The thicknesses of the first current collector and the second current collector are different.

20. The battery according to any one of claims 1-6, characterized in that, The first current collector is a copper member, and the second current collector is an aluminum member.

21. A battery device, characterized in that, Comprising a battery according to any one of claims 1-20.

22. An electrical device, characterized in that, Comprising a battery device according to claim 21, or a battery according to any one of claims 1-20.

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