Battery, battery apparatus, and electric device

Abstract

An electric device. The electric device comprises a battery apparatus or a battery; the battery apparatus comprises the battery; the battery comprises an electrode core, a first current collector, and a second current collector; the electrode core comprises a tab; the first current collector is welded to the tab; the first current collector is disposed between the tab and the second current collector; the first current collector is electrically connected to the second current collector; and the second current collector is adapted to be electrically connected to a conductive terminal to lead out an electrode.

Description

Batteries, battery devices and electrical equipment

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese patent application No. 202421621916.4, filed on July 9, 2024, with the China National Intellectual Property Administration and entitled “Battery, Battery Device and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, and in particular to a battery, battery device, and electrical equipment. Background Technology

[0004] In existing technology, the battery cover structure includes a cover plate, a sealing ring, a spacer, a current collector, and conductive posts. The spacer is located between the cover plate and the current collector, partially obscuring the current collector. The conductive posts are electrically connected to the tabs via the current collector to draw current. However, this structure only allows welding the exposed portion of the current collector during the tab-to-current collector welding process, leading to increased impedance of the entire cell. This negatively impacts the battery's fast-charging performance and hinders product competitiveness.

[0005] Public content

[0006] This disclosure aims to address at least one of the technical problems existing in the prior art. Therefore, the first objective of this disclosure is to provide a battery that facilitates reducing cell impedance and improving the battery's fast-charging performance and overall lifespan.

[0007] A second object of this disclosure is to provide a battery device comprising the battery described in the above embodiments.

[0008] A third object of this disclosure is to provide an electrical device including the battery device or battery described in the above embodiments.

[0009] A battery according to a first aspect of the present disclosure includes: an electrode core, the electrode core including a tab; a first current collector welded to the tab; and a second current collector, the first current collector disposed between the tab and the second current collector, the first current collector and the second current collector being electrically connected, the second current collector being adapted to be electrically connected to a conductive terminal to lead out an electrode.

[0010] According to the battery of the present disclosure, the first current collector can be directly connected to the electrode tab by welding. Then, the second current collector is assembled with the battery cover plate, sealing ring, spacer ring and conductive terminals. Finally, the current is transmitted by electrically connecting the second current collector to the first current collector. At this time, any area of ​​the first current collector can be welded as needed to increase the overcurrent area between it and the electrode tab, reduce the impedance, prevent local overheating, and thus improve the fast charging performance and life of the battery.

[0011] 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 welded to the first disk body.

[0012] In some embodiments, the second disc body is welded to two opposite sides of the first disc body.

[0013] In some embodiments, the second disk body is at least partially welded to the circumferential edge of the first disk body.

[0014] In some embodiments, one of the first disc body and the second disc body is provided with a flange that extends circumferentially, and the other of the first disc body and the second disc body is welded to the flange.

[0015] In some embodiments, the first current collector includes a first disc body, the second current collector includes a second disc body, one of the first disc body and the second disc body is provided with a flange, the flange extends circumferentially, the flange forms at least one opening, and the other of the first disc body and the second disc body is provided with at least one limiting portion, the limiting portion being engaged with the corresponding opening for limiting.

[0016] In some embodiments, the first disc body is welded to the electrode tab to form at least one first weld, and the second disc body is welded to the first disc body to form at least one second weld, wherein the second weld and the first weld are spaced apart.

[0017] In some embodiments, a plurality of the first welds extend radially along the first disk body, and the plurality of the first welds are spaced apart circumferentially along the first disk body.

[0018] In some embodiments, the first disc body has at least one first through hole, and two adjacent first welds are disposed on both sides of the first through hole.

[0019] In some embodiments, the first disk body is formed with a second through hole, which is disposed between the ends of the plurality of first welds away from the edge of the first disk body, and the second through hole and the ends of the plurality of first welds away from the edge of the first disk body are all spaced apart.

[0020] In some embodiments, a plurality of the second welds extend circumferentially along the second disc and are spaced apart.

[0021] In some embodiments, the second disk body is formed with at least one third through hole, the third through hole extending circumferentially along the second disk body, and the third through hole being opposite to at least one first through hole along the axial direction of the battery.

[0022] In some embodiments, the second current collector further includes: a current-passing connection portion, one end of which is connected to the second disk body, the other end of which extends radially along the second disk body, and the current-passing connection portion and the second disk body define the third through hole.

[0023] In some embodiments, a fourth through hole is formed at the other end of the overcurrent connection portion, the fourth through hole being adapted to be electrically connected to a conductive terminal to lead out an electrode.

[0024] In some embodiments, the battery further includes a conductive terminal, which is configured as a pole post, and the pole post is provided with a mating part, which is welded to the fourth through hole.

[0025] In some embodiments, the first current collector includes a first disc body, the second current collector includes a second disc body, and the second disc body is bonded to the first disc body.

[0026] In some embodiments, the axial height of the flange is greater than or equal to the axial height of the other of the first current collector and the second current collector.

[0027] In some embodiments, the device further includes an insulating member disposed between the first disk body and the overcurrent connection portion.

[0028] In some embodiments, the first current collector and the second current collector have different thicknesses.

[0029] In some embodiments, the first current collector is made of copper and the second current collector is made of aluminum.

[0030] The battery device according to a second aspect embodiment of the present disclosure includes the battery according to the first aspect embodiment of the present disclosure described above.

[0031] The electrical device according to the third aspect of the present disclosure includes the battery device according to the second aspect of the present disclosure, or the battery according to the first aspect of the present disclosure.

[0032] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0033] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0034] Figure 1 is a partial schematic diagram of a battery according to an embodiment of the present disclosure.

[0035] Figure 2 is an exploded view of the first current collector and the second current collector according to an embodiment of the present disclosure.

[0036] Figure 3 is a schematic diagram of a first collector according to an embodiment of the present disclosure.

[0037] Figure 4 is a schematic diagram of a second collector according to an embodiment of the present disclosure.

[0038] Figure 5 is a schematic diagram of a pole according to an embodiment of the present disclosure.

[0039] Figure 6 is an assembly diagram of the first current collector and the second current collector according to an embodiment of the present disclosure.

[0040] Figure 7 is a cross-sectional view of the first current collector and the second current collector assembled according to an embodiment of the present disclosure.

[0041] Figure 8 is a schematic block diagram of a battery device according to an embodiment of the present disclosure.

[0042] Figure 9 is a schematic block diagram of an electrical appliance according to an embodiment of the present disclosure.

[0043] Figure 10 is another schematic block diagram of an electrical appliance according to an embodiment of the present disclosure.

[0044] Reference numerals: 2000, electrical equipment; 1000, battery device; 100, battery; 10, first current collector; 11, first disc; 12, first through hole; 13, second through hole; 14, first weld; 15, second weld; 16, flange; 17, opening; 20, second current collector; 21, second disc; 22, third through hole; 23, overcurrent connection; 24, fourth through hole; 26, limiting part; 30, pole; 31, mating part; 32, pole core; 33, pole tab; 40, insulating part; 50, conductive terminal. Detailed Implementation

[0045] The embodiments of this disclosure are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary. A battery 100 according to an embodiment of this disclosure is described below with reference to Figures 1-7, including an electrode core 32, a first current collector 10, and a second current collector 20.

[0046] Specifically, as shown in Figures 1-7, the electrode core 32 includes an electrode tab 33, a first current collector 10 is welded to the electrode tab 33, the first current collector 10 is disposed between the electrode tab 33 and the second current collector 20, the first current collector 10 and the second current collector 20 are electrically connected, and the second current collector 20 is adapted to be electrically connected to the conductive terminal 50 to lead out an electrode.

[0047] Referring to Figures 1-5, the electrode core 32 serves as the active material carrier of the battery 100, responsible for generating or consuming electrons through electrochemical reactions during charging and discharging. The tab 33 is an extension of the electrode core 32, 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 electrically connected. The first current collector 10 is adapted to be welded to the electrode core 32 of the battery 100, and the connection between the first current collector 10 and the second current collector 20 is achieved through welding or bonding.

[0048] According to the battery 100 of this disclosure embodiment, the first current collector 10 can be directly welded to the tab 33. Then, the second current collector 20 is assembled with the cover plate, sealing ring, spacer ring, and conductive terminal 50 of the battery 100. Finally, the second current collector 20 is electrically connected to the first current collector 10 to realize current transmission. At this time, any area of ​​the first current collector 10 can be welded as needed to increase the current-carrying area between it and the tab 33, avoiding the heat effect caused by current concentration in certain areas, reducing the impedance between the tab 33 and the first current collector 10, preventing local overheating, thereby improving the fast charging performance and lifespan of the battery 100.

[0049] The first current collector 10 and the second current collector 20 are stacked together to form a multi-layer structure, facilitating current outflow. The tight connection between the multi-layer current collectors enhances the stability and mechanical strength of the overall structure, reducing the risk of conductive path interruption due to deformation. In particular, when the battery 100 or capacitor undergoes volume changes during charge-discharge cycles, the stable stacked structure better maintains the continuity of electrical contacts.

[0050] According to some embodiments of this disclosure, as shown in Figures 2 and 3, the first current collector 10 includes a first disk 11, and the second current collector 20 includes a second disk 21, which is welded to the first disk 11. The first disk 11 and the second disk 21 can provide a large surface area, which is beneficial for heat dissipation and reduces local overheating. Simultaneously, the disk-shaped structure increases the contact area with the tab 33, further reducing contact resistance and improving current transmission efficiency. The welding connection between the second disk 21 and the first disk 11 enhances the overall connection strength between the first current collector 10 and the second current collector 20, enabling it to withstand larger current loads without easily deforming. The welding connection between the first disk 11 and the second disk 21 ensures highly reliable electrical contact and mechanical fixation. Compared to other connection methods, welding can form a more robust and low-impedance connection interface, contributing to the high power output and long-term stable operation of the battery 100.

[0051] According to some embodiments of this disclosure, as shown in Figures 2 and 3, the second disc 21 is welded to two opposite sides of the first disc 11. By welding the second disc 21 to the opposite sides of the first disc 11, welding stress can be distributed more evenly, avoiding the risk of fracture caused by a single weld point bearing too much force, thereby enhancing the stability and durability of the overall structure. Such a welding layout also helps heat dissipate more quickly from the welding area to the surroundings, because the weld points are distributed over a wider area, which helps with heat management and reduces the possibility of localized overheating.

[0052] According to some embodiments of this disclosure, as shown in Figures 2 and 3, the second disk 21 is at least partially welded to the circumferential edge of the first disk 11. Circumferential edge welding effectively connects the outer peripheries of the first disk 11 and the second disk 21, significantly increasing the overall rigidity and torsional resistance of the structure and preventing separation or deformation due to external forces. Circumferential welding also disperses welding stress over a larger area, avoiding stress concentration and reducing the risk of cracking or fracture due to excessive local stress, further enhancing the connection strength between the first disk 11 and the second disk 21.

[0053] According to some embodiments of this disclosure, as shown in Figures 2 and 3, one of the first disc body 11 and the second disc body 21 is provided with a flange 16, which extends circumferentially, and the other of the first disc body 11 and the second disc body 21 is welded to the flange 16.

[0054] The circumferentially extending flange 16 facilitates welding between the first disc 11 and the second disc 21, significantly improving the strength and durability of the welded joint and reducing the risk of detachment due to vibration or external force. The flange 16 provides a clear guiding structure, facilitating alignment and securing of the two discs, reducing assembly errors, and improving production efficiency.

[0055] According to some embodiments of this disclosure, as shown in Figures 2-4, the first collector 10 includes a first disc 11, and the second collector 20 includes a second disc 21. One of the first disc 11 and the second disc 21 is provided with a flange 16, which extends circumferentially and forms at least one opening 17. The other of the first disc 11 and the second disc 21 is provided with at least one limiting part 26, which limits and cooperates with the corresponding opening 17.

[0056] One of the first disc body 11 and the second disc body 21 includes a flange 16, which extends circumferentially along the battery 100 and has at least one opening 17; the other of the first disc body 11 and the second disc body 21 includes a limiting portion 26, which is disposed on the outer periphery of the first disc body 11 or the second disc body 21 and engages with the corresponding opening 17.

[0057] For example, a flange 16 is formed on the first disk body, extending along the axial direction of the battery 100 toward the side where the second disk body 21 is located. The flange 16 is formed on the outer periphery of the first disk body 11, and a plurality of openings 17 are formed on the flange 16. The plurality of openings 17 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, and the limiting portion 26 extends from a portion of the edge of the second disk body 21 radially toward the direction away from the center of the second disk body 21, protruding from the outer periphery of the second disk body 21. The limiting portion 26 includes a plurality of portions, which are evenly spaced along the circumferential direction of the second disk body 21. The plurality of limiting portions 26 correspond one-to-one with the plurality of openings 17, and the limiting portion 26 is embedded in the opening 17.

[0058] Therefore, the flange 16 provided in the first current collector 10 or the second current collector 20 extends circumferentially along the battery 100, which not only increases the edge strength of the current collector but also provides a positioning and fixing mechanism for assembly. At least one opening 17 on the flange 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, ensuring the consistency and repeatability of the assembly. The mechanical interlocking structure between the limiting portion 26 and the opening 17 ensures a stable axial and radial alignment between the two current collectors, maintaining good contact even when the battery 100 is subjected to mechanical stress or thermal expansion, reducing the possibility of loosening. The cooperation between the flange 16 and the limiting portion 26 not only improves the simplicity and efficiency of the assembly process and reduces errors from manual operation, but also maintains the stability of the battery 100 throughout its entire lifespan, which is beneficial for maintaining the electrical performance of the battery 100, reducing internal resistance growth, and improving the safety of the battery 100.

[0059] According to some embodiments of this disclosure, as shown in Figures 2-4, a first disc 11 is welded to a tab 33 to form at least one first weld 14, and a second disc 21 is welded to the first disc 11 to form at least one second weld 15. The second weld 15 and the first weld 14 are spaced apart. The first weld 14 and the second weld 15 are spaced apart along the circumference of the first disc 11.

[0060] Therefore, the spaced welds help disperse heat, preventing heat accumulation at adjacent weld points and thus avoiding localized 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, stress concentration caused by welding can be effectively reduced, lowering the risk of material fatigue or fracture due to stress accumulation and improving the long-term reliability of the battery 100 structure. The multi-point support structure formed by multiple welds can more evenly distribute the mechanical stress experienced by the battery 100 during use or transportation, enhancing the overall mechanical strength and durability.

[0061] According to some embodiments of this disclosure, as shown in Figures 2 and 3, a plurality of first weld seams 14 extend radially along the first disk body 11 and are spaced apart circumferentially along the first disk body 11. The first disk body 11 may be formed into a disk-shaped structure. The first weld seams 14 extend 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 seams 14 to realize the current conduction between the cell 32 and the battery 100. The plurality of first weld seams 14 are evenly spaced along the circumference of 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] Therefore, the first weld 14 is suitable for providing an electrical contact point for the connection between the first current collector 10 and the electrode core 32. The radial extension of the first weld 14 along the first disk 11 helps ensure that current at different radii can be effectively collected and guided to the battery 100, thereby improving the efficiency and uniformity of current transmission. The first current collector 10 is electrically connected to the electrode core 32 through the first weld 14, which helps to ensure good electrical continuity between the first current collector 10 and the electrode core 32, reduce contact resistance, and further reduce the internal resistance of the electrode core 32. The arrangement of multiple first welds 14 helps to achieve balanced current collection and transmission in the circumferential direction of the first disk 11, ensuring the uniformity of current conduction. The spaced arrangement of multiple first welds 14 also enhances the stability and reliability of the structure, allowing each first weld 14 to independently bear a portion of the current, improving the overall current conduction capacity and stability of the battery 100.

[0063] According to some embodiments of this disclosure, as shown in Figures 2 and 3, the first disk 11 has at least one first through hole 12, and two adjacent first welds 14 are provided on both sides of the first through hole 12. The first through hole 12 penetrates the first disk 11 along its thickness direction. Thus, the first through hole 12 provides the battery 100 with a certain deformation space, especially when the material volume changes during the charging and discharging process of the battery 100, which helps to reduce internal stress and prevent structural damage. The first through hole 12 can be used to allow rapid electrolyte wetting or as a venting channel inside the battery 100, which helps to improve the operational safety of the battery 100 and extend its service life.

[0064] According to some embodiments of the present disclosure, as shown in Figures 2 and 3, a first disk body 11 is formed with a second through hole 13. The second through hole 13 is disposed between the ends of a plurality of first welds 14 that are away from the edge of the first disk body 11, and the second through hole 13 and the ends of the plurality of first welds 14 that are away from the edge of the first disk body 11 are all spaced apart.

[0065] The second through hole 13 is located at the center of the first disc 11, penetrating the first disc 11 along its thickness direction. One end of the first weld 14 is adjacent to the second through hole 13, and the other end of the first weld 14 extends towards the edge of the first disc 11, away from the second through hole 13. Along the radial direction of the first disc 11, one end of the first through hole 12 is spaced apart from the second through hole 13, and the other end of the first through hole 12 is spaced apart from the edge of the first disc 11. Along the circumferential direction of the first disc 11, the first through hole 12 is located between two adjacent first welds 14.

[0066] Therefore, the second through hole 13 is used for the rapid flow of electrolyte and the exhaust channel after the cell 32 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 14 on the first disk 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 reliability of the battery 100.

[0067] According to some embodiments of this disclosure, as shown in Figures 2 and 3, a plurality of second weld seams 15 extend circumferentially along the second disk body 21 and are spaced apart. The second weld seams 15 are located circumferentially between two adjacent first weld seams 14, and radially away from the center of the second disk body 21. Along the circumferential direction of the second disk body 21, the second weld seams 15 are located between two adjacent first weld seams 14, and the first weld seams 14 and second weld seams 15 do not interfere with each other.

[0068] Therefore, the second weld 15, arranged circumferentially along the second disk 21, helps to distribute the current more evenly in the circumferential direction, improving the efficiency of current collection and distribution in the battery 100. The second weld 15 also helps to optimize 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 alternating distribution of the first weld 14 and the second weld 15 further refines 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 15 is suitable for connection 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, improving the reliability of the battery 100.

[0069] According to some embodiments of this disclosure, as shown in Figures 2 and 4, the second disk 21 has at least one third through hole 22. The third through hole 22 extends circumferentially along the second disk 21, and is opposite to at least one of the plurality of first through holes 12 along the axial direction of the battery 100. The third through hole 22 extends circumferentially along the second disk 21 and 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] Therefore, the aligned third through-hole 22 and the first through-hole 12 help form a continuous channel between the first current collector 10 and the second current collector 20, promoting the unobstructed flow of electrolyte and allowing the electrolyte to quickly wet the battery 100. It also serves as a venting channel inside the cell 32, 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 accurately controlled, thereby promoting the uniformity of the electrochemical reaction and improving the overall performance and lifespan of the battery 100.

[0071] According to some embodiments of the present disclosure, as shown in Figures 2 and 4, the second current collector 20 further includes a current-passing connection portion 23. One end of the current-passing connection portion 23 is connected to the second disk body 21, and the other end of the current-passing connection portion 23 extends from the outside to the inside along the radial direction of the second disk body 21. A third through hole 22 is defined between the current-passing connection portion 23 and the second disk body 21.

[0072] The overcurrent connection 23 extends radially along the second disc body 21. One end of the overcurrent connection 23 is located at the center of the second disc body 21, and the other end of the overcurrent connection 23 extends radially along the second disc body 21 toward the edge of the second disc body 21.

[0073] Therefore, the overcurrent connection 23 provides additional mechanical support for the battery 100, especially during the charging and discharging process of the battery 100, helping to maintain the shape stability of the current collector and preventing deformation or breakage due to stress concentration. As a conductive structure, the overcurrent connection 23 directly participates in the current conduction process, ensuring a more direct and efficient path for the current to be discharged from the second disk 21 to the outside, reducing resistance, preventing heat accumulation under overcurrent conditions, and protecting the safety of the battery 100.

[0074] According to some embodiments of this disclosure, as shown in Figures 2 and 4, a fourth through hole 24 is formed at the other end of the overcurrent connection portion 23. The fourth through hole 24 is adapted to be electrically connected to the conductive terminal 50 to lead out an electrode.

[0075] The fourth through hole 24 penetrates the current-passing connection portion 23 along the thickness direction of the second disk 21 at one end of the center of the second disk 21. The fourth through hole 24 and the second through hole 13 are arranged opposite each other along the thickness direction of the battery 100, and their central axes coincide. The fourth through hole 24 is suitable for connection with the conductive terminal 50 to ensure a direct and reliable electrical interface between the internal circuitry of the battery 100 and the external circuitry. This design simplifies the assembly process of the battery 100, reduces connection links, lowers contact resistance, and thus improves power transmission efficiency.

[0076] Therefore, the axially opposite design of the fourth through hole 24 and the second through hole 13 ensures that the first current collector 10 and the second current collector 20 are aligned after assembly, which helps maintain the assembly of the internal structure of the battery 100, reduces assembly errors, 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 run 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 this disclosure, as shown in Figures 1 and 5, the battery 100 further includes a conductive terminal 50, which is configured as a pole post 30. The pole post 30 is provided with a mating part 31, which is welded to the fourth through hole 24.

[0078] The terminal post 30 in the battery 100 is responsible for conducting the current inside the battery 100 to the external circuit. The mating part 31 on the terminal post 30 precisely mates 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 contact resistance, and facilitating the installation and fixation of the terminal post 30, thus improving the ease and reliability of battery 100 assembly. One end of the terminal post 30 is welded to the fourth through hole 24, which enhances 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 provides a strong 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 this disclosure, the first collector 10 includes a first disc 11, and the second collector 20 includes a second disc 21, which is bonded to the first disc 11.

[0080] According to some embodiments of this disclosure, as shown in Figures 2-4, the height of the flange 16 along the axial direction of the battery 100 is greater than or equal to the height of the other of the first current collector 10 and the second current collector 20 along the axial direction of the battery 100. The flange 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 flange 16 is sufficient to match or exceed the height of the other current collector, ensuring a reliable physical connection between the first current collector 10 and the second current collector 20 after assembly, preventing misalignment or separation due to external forces, and enhancing the overall structural strength and stability of the battery 100.

[0081] According to some embodiments of this disclosure, as shown in Figures 6 and 7, an insulating member 40 is also included, which is disposed between the first disk body 11 and the overcurrent connection portion 23.

[0082] Along the thickness direction of the battery 100, the insulating member 40 is disposed between the overcurrent connection portion 23 of the first current collector 10 and the second current collector 20. Its main function is to ensure electrical isolation between the first current collector 10 and the second current collector 20, prevent current from being conducted due to the contact between the first current collector 10 and the second current collector 20, prevent short circuit, effectively prevent accidental contact between electrodes, reduce the risk of short circuit of the battery 100, and thus improve the overall safety performance of the battery 100.

[0083] According to some embodiments of this disclosure, the first current collector 10 and the second current collector 20 have different thicknesses. Current collectors of different thicknesses can optimize the electric field distribution inside the battery 100, ensuring uniform current conduction in different areas. For example, a thicker current collector may carry a larger current, reducing resistance and heat generation, while a thinner current collector is used where greater flexibility or adaptation to specific structures is required. By adjusting the thickness of the current collectors, the mechanical strength and weight requirements of the battery 100 can be balanced. A thicker current collector provides better mechanical support and stability, suitable for withstanding internal pressure or external mechanical stress of the battery 100, while a thinner portion may be used in designs requiring bending or adaptation to complex geometries.

[0084] According to some embodiments of this disclosure, the first current collector 10 is made of copper, and the second current collector 20 is made of aluminum. Copper has a much higher electrical and thermal conductivity than aluminum. Using copper as the first current collector 10 allows for more efficient current conduction, reducing energy loss, and also enables rapid heat dissipation, controlling the temperature rise of the battery 100 during operation. Aluminum has slightly lower electrical conductivity but better thermal conductivity. Using aluminum as the second current collector 20 effectively assists in thermal management and is less expensive. Choosing aluminum as the second current collector 20 reduces the weight of the battery 100 without significantly sacrificing conductivity, thus contributing to the lightweight and low-cost design of the battery 100. A dense oxide film easily forms on the surface of aluminum, providing good corrosion resistance and reducing the erosion of the current collector by electrochemical reactions, extending the service life of the battery 100. Therefore, using copper for the first current collector 10 and aluminum for the second current collector 20 ensures both high performance and high efficiency of the battery 100, while also controlling the production cost and improving the ease of processing the battery 100.

[0085] The battery device 1000 according to a second aspect embodiment of the present disclosure includes the battery 100 in the above embodiment, as shown in FIG8.

[0086] According to the battery device 1000 of the present disclosure, by applying the battery 100 in the above embodiments, the stability and reliability of the battery device 1000 can be improved, the safety of the battery device 1000 during use can be improved, and the service life of the battery device 1000 can be extended.

[0087] The electrical appliance 2000 according to the third aspect of this disclosure includes the battery device 1000 or battery 100 in the above embodiments, as shown in FIG9 and FIG10.

[0088] According to the embodiments of the present disclosure, by applying the battery device 1000 or battery 100 in the above embodiments, the electrical device 2000 can achieve more efficient energy conversion and transmission, improve the device's battery life and response speed, and effectively prevent safety hazards such as short circuits and overheating during use, thus ensuring user safety.

[0089] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0090] In the description of this disclosure, "first feature" and "second feature" may include one or more of the features. In the description of this disclosure, "a plurality of" means two or more. In the description of this disclosure, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them. In the description of this disclosure, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0092] Although embodiments of this disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery (100), characterized in that, include: The electrode core (32) includes a tab (33); The first current collector (10) is welded to the tab (33); and The second current collector (20) is disposed between the first current collector (10) and the second current collector (20), the first current collector (10) and the second current collector (20) are electrically connected, and the second current collector (20) is adapted to be electrically connected to the conductive terminal (50) to lead out the electrode.

2. The battery (100) according to claim 1, characterized in that, The first current collector (10) includes a first disk (11), and the second current collector (20) includes a second disk (21), which is welded to the first disk (11).

3. The battery (100) according to claim 2, characterized in that, The second disk (21) is welded to the two sides opposite to the first disk (11).

4. The battery (100) according to claim 2 or 3, characterized in that, The second disk (21) is at least partially welded to the circumferential edge of the first disk (11).

5. The battery (100) according to any one of claims 2-4, characterized in that, One of the first disc body (11) and the second disc body (21) is provided with a flange (16) that extends circumferentially, and the other of the first disc body (11) and the second disc body (21) is welded to the flange (16).

6. The battery (100) according to claim 1, characterized in that, The first current collector (10) includes a first disc (11), and the second current collector (20) includes a second disc (21). One of the first disc (11) and the second disc (21) is provided with a flange (16), which extends circumferentially and forms at least one opening (17). The other of the first disc (11) and the second disc (21) is provided with at least one limiting part (26), which limits and cooperates with the corresponding opening (17).

7. The battery (100) according to any one of claims 2-6, characterized in that, The first disc (11) is welded to the tab (33) to form at least one first weld (14), and the second disc (21) is welded to the first disc (11) to form at least one second weld (15). The second weld (15) and the first weld (14) are spaced apart.

8. The battery (100) according to claim 7, characterized in that, The plurality of first welds (14) extend radially along the first disk body (11) and are spaced apart circumferentially along the first disk body (11).

9. The battery (100) according to claim 7 or 8, characterized in that, The first disc body (11) has at least one first through hole (12), and two adjacent first welds (14) are provided on both sides of the first through hole (12).

10. The battery (100) according to any one of claims 7-9, characterized in that, The first disk body (11) has a second through hole (13), which is located between the ends of the plurality of first welds (14) away from the edge of the first disk body (11). The second through hole (13) and the ends of the plurality of first welds (14) away from the edge of the first disk body (11) are all spaced apart.

11. The battery (100) according to any one of claims 7-10, characterized in that, Multiple second welds (15) extend circumferentially along the second disc body (21) and are spaced apart.

12. The battery (100) according to claim 9, characterized in that, The second disk (21) has at least one third through hole (22) extending circumferentially along the second disk (21), and the third through hole (22) is opposite to at least one first through hole (12) along the axial direction of the battery (100).

13. The battery (100) according to claim 12, characterized in that, The second current collector (20) also includes: A flow-through connection (23) is provided, one end of which is connected to the second disk body (21), and the other end of which extends radially along the second disk body (21). The third through hole (22) is defined between the flow-through connection (23) and the second disk body (21).

14. The battery (100) according to claim 13, characterized in that, The other end of the overcurrent connection (23) is provided with a fourth through hole (24), which is adapted to be electrically connected to a conductive terminal (50) to lead out an electrode.

15. The battery (100) according to claim 14, characterized in that, The battery (100) also includes a conductive terminal (50), which is constructed as a pole post (30). The pole post (30) is provided with a mating part (31), which is welded to the fourth through hole (24).

16. The battery (100) according to claim 1, characterized in that, The first current collector (10) includes a first disc (11), and the second current collector (20) includes a second disc (21), which is bonded to the first disc (11).

17. The battery (100) according to claim 5 or 6, characterized in that, The height of the flange (16) along the axial direction is greater than or equal to the height of the other of the first current collector (10) and the second current collector (20) along the axial direction of the battery (100).

18. The battery (100) according to any one of claims 13-15, characterized in that, Also includes: An insulating element (40) is disposed between the first disk body (11) and the overcurrent connection portion (23).

19. The battery (100) according to any one of claims 1-18, characterized in that, The thicknesses of the first current collector (10) and the second current collector (20) are different.

20. The battery (100) according to any one of claims 1-19, characterized in that, The first current collector (10) is made of copper, and the second current collector (20) is made of aluminum.

21. A battery device (1000), characterized in that, Includes the battery (100) according to any one of claims 1-20.

22. An electrical appliance (2000), characterized in that, Includes the battery device (1000) according to claim 21, or the battery (100) according to any one of claims 1-20.

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