Battery, battery pack and electric equipment

Abstract

The utility model provides a battery, a battery pack and electric equipment, the battery comprises a roll core and a current collecting disc, the welding area of the end face of the roll core and the current collecting disc is 10%-90% of the area of the end face, on the basis of the structure of the roll core, the effective welding area is ensured, the connection strength between the current collecting disc and the roll core can be increased, and the stability of structural connection is improved.

Description

Technical Field

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

[0002] Battery current collectors are typically welded to the top cover. Welding provides strong mechanical bonding, making the weld joint very secure and able to withstand certain mechanical stresses. Compared to other connection methods, welding better ensures that the weld joint is less likely to loosen or break under vibration or external force. In related technologies, due to limitations in the battery's own structure or function, the welding area between the core and the current collector is often unreasonable, leading to weld joints that are prone to detachment or breakage, thus causing problems such as internal short circuits or open circuits within the battery. Utility Model Content

[0003] Embodiments of this application provide a battery, battery pack, and electrical device that can improve the technical problem of unreasonable welding area of ​​the core and current collector.

[0004] In the first aspect, this application provides a battery:

[0005] The shell has a receiving chamber;

[0006] The core is disposed within the receiving cavity;

[0007] A collector plate is disposed in the receiving cavity and welded to the core, the core including an end face facing the collector plate, and the welding area between the end face and the collector plate accounts for 10%-90% of the area of ​​the end face.

[0008] In some embodiments, the collector plate has multiple welding zones arranged around the center of the collector plate, and each welding zone has multiple welding lines facing the core.

[0009] In some embodiments, the radius of the manifold is R, and at least one of the bonding wires has a length greater than or equal to 0.05R.

[0010] In some embodiments, the length of at least one of the welding wires is greater than or equal to 3 mm.

[0011] In some embodiments, each of the bonding wires includes at least one bend, the bend comprising a first connecting segment and a second connecting segment connected to each other, the included angle between the first connecting segment and the second connecting segment being greater than or equal to 0° and less than 180°.

[0012] In some embodiments, each of the bonding wires includes a plurality of bends connected in sequence.

[0013] In some embodiments, in each of the bending portions, one end of the first connecting segment and one end of the second connecting segment are connected to each other to form an endpoint, the other ends of the first connecting segment and the other ends of the second connecting segment are spaced apart and are both located on the same straight line, and the distance from the endpoint to the straight line is greater than or equal to 0.5 mm.

[0014] In some embodiments, each of the bonding wires extends along the radial direction of the core.

[0015] In some embodiments, the collector plate includes a central portion and a plurality of connectors. The plurality of connectors are connected to the central portion and extend radially toward the collector plate. A welding area is provided between two adjacent connectors. A first gap is formed between each welding area and the central portion, and a second gap is formed between each welding area and a connector. The first gap communicates with the second gap.

[0016] In some embodiments, the contact area between the end face and the collector plate accounts for 50%-100% of the end face area.

[0017] In some embodiments, in each welding zone, the length of the weld wire located in the middle of the welding zone is greater than the length of the weld wire located on both sides of the welding zone.

[0018] In some embodiments, the length of the weld wire located in the middle of the welding area is a first length, and the length of the weld wire located on both sides of the welding area is a second length, wherein the difference between the first length and the second length is greater than or equal to 0.1 mm.

[0019] In some embodiments, a plurality of the bonding wires are arranged circumferentially around the core.

[0020] This application also provides a battery pack, which includes the battery as described above.

[0021] This application also provides an electrical device including the battery pack as described above.

[0022] The beneficial effects of the embodiments of this application are as follows:

[0023] This application provides a battery comprising a core and a current collector. The welding area between the end face of the core and the current collector is between 10% and 90% of the end face area. Based on the core's own structure, this ensures an effective welding area, thereby increasing the connection strength between the current collector and the core and improving the stability of the structural connection. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the collector disk provided in the embodiments of this application. Figure 1 ;

[0026] Figure 2 yes Figure 1 An enlarged schematic diagram of part A shown;

[0027] Figure 3 This is a schematic diagram of the structure of the collector disk provided in the embodiments of this application. Figure 2 ;

[0028] Figure 4 This is a schematic diagram of the structure of the collector disk provided in the embodiments of this application. Figure 3 ;

[0029] Figure 5 This is a schematic diagram of the structure of the collector disk provided in the embodiments of this application. Figure 4 .

[0030] Figure 6 This is a cross-sectional view of the battery provided in an embodiment of this application.

[0031] Figure label:

[0032] 1. Battery;

[0033] 33. Roller core;

[0034] 35. Collector disk;

[0035] 36. Welding area; 360. Weld line; 361. Bending section; 3611. First connecting section; 3612. Second connecting section;

[0036] 300, central part; 311, connector; 321, first gap; 322, second gap. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0038] Please refer to Figures 1-2 , Figure 1 This is a schematic diagram of the structure of the collector disk 35 provided in the embodiments of this application. Figure 1 , Figure 2 yes Figure 1 The diagram shows an enlarged view of part A. This application provides a battery 1, which includes a casing, a winding core 33, and a current collector 35. The casing has a receiving chamber, the winding core 33 is disposed in the receiving chamber, and the current collector 35 is welded to the winding core 33. The winding core 33 includes an end face facing the current collector 35. The welding area between the end face and the current collector 35 accounts for 10%-90% of the area of ​​the end face, that is, the welding area between the end face and the current collector 35 is greater than or equal to 10% and less than or equal to 90% of the area of ​​the end face.

[0039] Specifically, the welding area of ​​the core 33 of battery 1 refers to the area on the end face of the core 33 where the current collector 35 can be safely and effectively welded. The design of battery 1 determines the shape, size, and position of the tabs of the core 33, thus affecting the size and shape of the welding area. The size of the welding area directly affects the strength of the weld, the reliability of the electrical connection, and the current carrying capacity of battery 1. If the welding area is too large or too small, it may cause battery 1 to malfunction during use, or even lead to a safety accident.

[0040] Specifically, if the welding area is insufficient, the welding point may be weak. When the battery 1 is subjected to external impact or vibration, the welding point may easily fall off or break, thereby causing problems such as internal short circuit or open circuit in the battery 1. However, since a central hole is formed in the middle of the winding core 33 after winding, and wrinkles are formed on the edge of the winding core 33, the middle area and the outermost area of ​​the winding core 33 cannot be directly welded to the current collector 35, thus limiting the upper limit of the welding area.

[0041] This application provides a battery 1, which includes a core 33. The welding area between the end face of the core 33 and the current collector 35 is between 10% and 90% of the end face area. Based on the structure of the core 33 itself, the effective welding area is guaranteed, which can increase the connection strength between the current collector 35 and the core 33 and improve the stability of the structural connection.

[0042] For example, the welding area between the end face of the core 33 and the collector plate 35 is 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% of the end face area, etc., but this application embodiment does not limit this.

[0043] In some embodiments, the collector plate 35 has multiple welding areas 36 arranged around the center of the collector plate 35, and each welding area 36 has multiple welding lines 360 on the side facing the core 33. The welding lines 360 are the welding paths of the collector plate 35 and the core 33. The arrangement of the welding areas 36 around the center of the collector plate 35 can better adapt to the end face shape of the core 33 and increase the welding area of ​​the end faces of the collector plate 35 and the core 33.

[0044] In some embodiments, the radius of the manifold 35 is R, and the length of at least one of the bonding wires 360 is greater than or equal to 0.05R. For example, if the radius of the manifold 35 is R and is 20mm, then the length of at least one bonding wire 360 ​​is greater than or equal to 1mm. This embodiment does not limit this.

[0045] In some embodiments, the length of at least one of the welding wires 360 is greater than or equal to 3 mm. For example, it can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, etc. If the length of the welding wire 360 ​​is short, multiple welding is required, and intermittent welding will affect the welding efficiency. Increasing the welding length can ensure the continuity of welding.

[0046] In some embodiments, the line width of each bonding wire 360 ​​is greater than or equal to 0.05 mm, such as 0.06 mm, 0.07 mm, 0.08 mm, 0.08 mm, 0.09 mm, etc., and this application embodiment does not limit this.

[0047] In some embodiments, the weld width of each weld line 360 ​​is greater than or equal to 0.1 mm, such as 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc., and this application embodiment does not limit this.

[0048] In some embodiments, each of the bonding wires 360 includes at least one bend 361, the bend 361 including a first connecting segment 3611 and a second connecting segment 3612 connected to each other, the included angle between the first connecting segment 3611 and the second connecting segment 3612 being greater than or equal to 0° and less than 180°.

[0049] For example, the included angle between the first connecting segment 3611 and the second connecting segment 3612 can be 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, 175°, etc., and this application embodiment does not limit it.

[0050] Understandably, the bend 361 increases the welding area, which improves the reliability and durability of the weld. This avoids problems such as weld cracking and detachment due to insufficient weld strength, thereby improving the fatigue resistance of the weld and extending the service life of battery 1.

[0051] In some embodiments, each of the weld wires 360 includes a plurality of bends 361 connected in sequence. It is understood that sequentially providing a plurality of bends 361 not only ensures weld strength but also guarantees weld continuity and consistency. The included angle between the first connecting segment 3611 and the second connecting segment 3612 of each weld area 36 may be equal or unequal.

[0052] In some embodiments, in each of the bending portions 361, one end of the first connecting segment 3611 and one end of the second connecting segment 3612 are connected to each other to form an endpoint, the other end of the first connecting segment 3611 and the other end of the second connecting segment 3612 are spaced apart and are both located on the same straight line, and the distance from the endpoint to the straight line is greater than or equal to 0.5 mm.

[0053] Specifically, since the bonding wire 360 ​​includes multiple bends 361, the width of the bonding wire 360 ​​is greater than the width of the bonding wire 360 ​​itself. The first connecting segment 3611 and the second connecting segment 3612 form a triangular structure. The width of the bonding wire 360 ​​is equal to the height G1 from the top of the bend 361 to the bottom of the bend 361. G1 is greater than or equal to 0.5mm, such as 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc., which are not limited in this application.

[0054] In some examples, each bonding wire 360 ​​includes a start end and an end end. When the bonding wire 360 ​​is a bent structure, if the start end and the end end are located on the same straight line radiating outward from the center of the collector plate 35, the length G2 of the bonding wire 360 ​​is equal to the difference between the length from the start end to the center of the circle and the length from the end end to the center of the circle.

[0055] If the initial end and the final end are located on different straight lines radiating outward from the center of the collector plate 35, the line passing through the final end and the center of the collector plate 35 is the first line, and the line passing through the final end and perpendicular to the first line is the second line. The length G2 of the welding line 360 ​​is equal to the distance from the initial end to the second line.

[0056] In some embodiments, each of the welding wires 360 extends radially along the core 33. Specifically, each welding area 36 includes a plurality of welding wires 360 arranged sequentially in the circumferential direction, each welding wire 360 ​​extending radially along the core 33. This arrangement maximizes the utilization of the space in the welding area 36 and increases the welding area.

[0057] In some embodiments, the collector plate 35 includes a central portion 300 and a plurality of connectors 311. The plurality of connectors 311 are connected to the central portion 300 and extend radially toward the collector plate 35. The plurality of connectors 311 are spaced apart. A welding area 36 is provided between two adjacent connectors 311. A first gap 321 is formed between each welding area 36 and the central portion 300. A second gap 322 is formed between each welding area 36 and a connector 311. The first gap 321 communicates with the second gap 322.

[0058] Specifically, the first gap 321 extends radially along the current collector 35, and the second gap 322 is arranged circumferentially along the current collector 35, forming a hollow area surrounding a portion of the welding area 36. It is understandable that chemical reactions occur inside the battery 1, such as overcharging, overheating, and electrolyte decomposition. This may generate gas, and excessive gas accumulation could lead to battery 1 expansion or explosion. The hollow area ensures that gas generated during the use of the winding core 33 can be promptly discharged from the winding core 33, forming a smooth exhaust channel.

[0059] In some embodiments, the collector plate 35 includes three connectors 311, which divide the collector plate 35 into three welding areas 36, each welding area 36 having a fan-shaped structure. The number of connectors 311 can also be 4, 5, 6, etc., and the number of welding areas 36 can also be 4, 5, 6, etc., which is not limited in this embodiment.

[0060] In some embodiments, each connector 311 is bent away from the core 33. This bending ensures effective contact between the current collector 35 and the battery cover, allowing the battery cover to be charged and form cathodic protection, improving the cover's corrosion resistance and thus ensuring its safety. Furthermore, the protrusion increases the perforated area of ​​the current collector 35, widening the venting channel for gas discharge from the core 33 and improving cell safety.

[0061] In some embodiments, the width of each connector 311 can be between 4mm and 8mm, such as 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc. Setting an appropriate width for the connector 311 can ensure that the protrusion of the connector 311 provides sufficient rebound force after being pressed down.

[0062] In some embodiments, the contact area between the end face and the collector plate 35 accounts for 50%-100% of the end face area. That is, the contact area between the end face and the collector plate 35 is greater than or equal to 50% and less than or equal to 100% of the end face area.

[0063] Understandably, since the collector plate 35 has gaps or protrusions, the end face cannot be fully connected to the collector plate 35. For example, the contact area between the end face and the collector plate 35 can be 50%, 60%, 70%, 80%, 90%, or 100% of the end face area. This application embodiment does not limit this.

[0064] In some embodiments, in each welding area 36, ​​the length of the weld wire 360 ​​located in the middle of the welding area 36 is greater than the length of the weld wires 360 located on both sides of the welding area 36. It is understood that since the weld wire 360 ​​has a certain width, if the length of the weld wires 360 located on both sides of the welding area 36 is too long, it will weld to the edge of the welding area 36. Therefore, the length of the weld wire 360 ​​located in the middle of the welding area 36 can be greater than the length of the weld wires 360 located on both sides of the welding area 36. The length of the weld wire 360 ​​decreases from the middle to both sides of each welding area 36 to ensure the welding effect of each welding area 36.

[0065] In some embodiments, the length of the weld line 360 ​​located in the middle of the welding area 36 is a first length, and the length of the weld lines 360 located on both sides of the welding area 36 is a second length, wherein the difference between the first length and the second length is greater than or equal to 0.1 mm. It is understood that, in order to ensure the consistency of the multiple weld lines 360 in the welding area 36, ​​the difference between the first length and the second length can be set to a smaller value.

[0066] For example, each welding area 36 is provided with three welding lines 360. The three welding lines 360 include a first line body located in the middle and two second lines body located on both sides of the first line body along the circumference of the collector plate 35. The two second lines body have the same length. The length of the first line body is a first length, and the length of the second line body is a second length. The difference between the first length and the second length is greater than or equal to 0.1mm, such as 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. The embodiments of this application do not limit this.

[0067] Please refer to Figures 3-4 , Figure 3 This is a schematic diagram of the structure of the collector disk 35 provided in the embodiments of this application. Figure 2 , Figure 4 This is a schematic diagram of the structure of the collector disk 35 provided in the embodiments of this application. Figure 3 In some embodiments, the collector plate 35 is a plane as a whole. Since the collector plate 35 does not have a connector 311 and a gap structure in the middle, the collector plate 35 includes a plurality of weld lines 360 arranged radially, and the length of each weld line 360 ​​may be the same.

[0068] In some embodiments, each welding line 360 ​​is a straight structure, and multiple welding lines 360 can extend straight outward from the center of the collector plate 35. Furthermore, the extension line of each welding line 360 ​​passes through the center point of the fan-shaped structure. To ensure welding quality, the lengths of multiple welding lines 360 can be kept the same, and the line width of the welding lines 360 can be appropriately increased.

[0069] In some examples, each wire 360 ​​includes a start end and an end end. When the wire 360 ​​is a straight structure, the length of the wire 360 ​​is equal to the difference between the length from the start end to the center and the length from the end end to the center.

[0070] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of the collector disk 35 provided in the embodiments of this application. Figure 4 In some embodiments, a plurality of the welding wires 360 are arranged circumferentially around the core 33. Specifically, each welding area 36 may be provided with a plurality of welding wires 360 in a direction away from the center of the core 33, each welding wire 360 ​​extending circumferentially around the core 33, and the plurality of welding wires 360 forming an approximately circular structure.

[0071] In some examples, the bonding wire 360 ​​forms an arc-shaped structure along the circumference, and the length G2 of the bonding wire 360 ​​is equal to the arc length corresponding to the included angle between the two ends of the bonding wire 360.

[0072] In some embodiments, battery 1 may be lead-acid battery 1, lithium-ion battery 1, nickel-metal hydride battery 1, or nickel-cadmium battery 1, and this application embodiment does not limit this.

[0073] Please refer to Figure 6 , Figure 6 This is a cross-sectional view of a battery provided in an embodiment of this application. In some embodiments, the battery 1 further includes a cover assembly and terminals. The housing has an opening, the cover assembly covers the opening, and the current collector 35 is welded to the winding core 33. Specifically, the winding core 33 is welded to the current collector 35, and the current collector 35 is connected to the terminals, so that after the cover assembly closes the battery 1 housing, the battery 1 is connected to an external circuit through the terminals, thereby enabling the conduction of current in the battery 1.

[0074] Among them, the current collector 35 is a negative current collector, which is welded to the negative electrode tab of the core 33. The current collector 35 can also be a positive current collector, which is welded to the positive electrode tab of the core 33. This application does not limit this.

[0075] This application also provides a battery pack, which is a modular device composed of multiple batteries 1 connected in series or in parallel, and the battery pack is capable of storing and providing energy.

[0076] This application also provides an electrical device, which includes a battery pack as described above, and a battery 1 for providing electrical energy to the electrical device. The electrical device can be an electric vehicle, power tool, electric bicycle, energy storage system, drone, mobile device, etc. By incorporating the battery 1, the safety of the electrical device can be ensured and its service life can be improved.

[0077] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery, characterized by, The application relates to a battery, comprising: a shell provided with a receiving chamber; a winding core arranged in the receiving chamber; a current collecting plate arranged in the receiving chamber and welded with the winding core, the winding core comprising an end face facing the current collecting plate, and the welding area of the end face and the current collecting plate accounts for 10%-90% of the area of the end face.

2. The battery of claim 1, wherein, The current collecting plate is provided with a plurality of welding areas, and the plurality of welding areas are arranged around the center of the current collecting plate, and each welding area is provided with a plurality of welding lines on one side facing the winding core.

3. The battery of claim 2, wherein, The radius length of the current collecting plate is R, and the length of at least one welding line is greater than or equal to 0.05R.

4. The battery of claim 2, wherein, The length of at least one welding line is greater than or equal to 3 mm.

5. The battery of claim 2, wherein, Each welding line comprises at least one bending part, and the bending part comprises a first connecting segment and a second connecting segment connected with each other, and the included angle between the first connecting segment and the second connecting segment is greater than or equal to 0 degrees and less than 180 degrees.

6. The battery of claim 5, wherein, Each welding line comprises a plurality of bending parts connected in sequence.

7. The battery of claim 6, wherein, In each bending part, one end of the first connecting segment and one end of the second connecting segment are connected with each other to form an end point, and the other end of the first connecting segment and the other end of the second connecting segment are arranged at intervals and are located on the same straight line, and the distance from the end point to the straight line is greater than or equal to 0.5 mm.

8. The battery according to any one of claims 2-7, characterized in that, Each welding line is arranged in the radial direction of the winding core.

9. The battery of claim 8, wherein, The current collecting plate further comprises a center part and a plurality of connecting pieces, the plurality of connecting pieces are connected to the center part and are arranged in the radial direction of the current collecting plate, the plurality of connecting pieces are arranged at intervals, the welding area is arranged between adjacent two connecting pieces, a first gap is formed between each welding area and the center part, a second gap is formed between each welding area and the connecting piece, and the first gap communicates with the second gap.

10. The battery of claim 9, wherein, The contact area of the end face and the current collecting plate accounts for 50%-100% of the area of the end face.

11. The battery of claim 9, wherein, In each welding area, the length of the welding line located in the middle of the welding area is greater than the length of the welding line located on both sides of the welding area.

12. The battery of claim 11, wherein, The length of the welding line located in the middle of the welding area is a first length, the length of the welding line located on both sides of the welding area is a second length, and the difference between the first length and the second length is greater than or equal to 0.1 mm.

13. The battery of any one of claims 2-7, wherein, The plurality of welding lines are arranged in the circumferential direction of the winding core.

14. A battery pack, characterized by The application further relates to a battery comprising the battery as claimed in any one of claims 1-13.

15. An electrical device, characterized by The application further relates to a battery pack comprising the battery as claimed in claim 14.

Images