Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment, the battery comprises: a shell and a cover plate, a weld bead is defined between the cover plate and the shell, and the cover plate and the shell are welded at the weld bead. Therefore, the shell is suitable for providing physical support and protection for an electrode assembly in the battery and serves as an external barrier of the battery to prevent external substances from invading, the cover plate is a sealing part at the top of the battery, the cover plate is matched with the shell, and the cover plate and the shell are in reliable sealing connection with the shell in the welding process. The welding bead is an area used for welding the cover plate and the shell, the welding firmness between the cover plate and the shell can be improved through the design of the welding bead, the welding yield is improved, it is guaranteed that welding scars do not protrude in the welding process, secondary repair welding can be conducted when welding defects exist, and the positioning precision of battery post-procedure production is improved.

Description

Technical Field

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

[0002] In the prior art, the cover plate and the housing of the battery are welded after being spliced. Direct welding at the splicing position will generate raised welding scars, resulting in the problem of corner collapse between the housing and the cover plate, and secondary repair welding cannot be performed. The raised welding scars will bring positioning errors to the penetration welding process of inserting the electrode core into the housing in the subsequent process, affecting the consistency of penetration welding, and causing the problem that the film cannot be tightly attached to the battery housing during battery film wrapping. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the first object of the utility model is to provide a battery, which can improve the reliability and stability of the battery and extend the service life of the battery.

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

[0005] The battery according to the first aspect embodiment of the utility model includes: a housing and a cover plate, a welding bead is defined between the cover plate and the housing, and the cover plate and the housing are welded at the welding bead.

[0006] For the battery according to the embodiment of the utility model, the housing is adapted to provide physical support and protection for the electrode assembly inside the battery, and at the same time serve as an external barrier of the battery to prevent external substances from invading. The cover plate is a closed component at the top of the battery, and the cover plate matches the housing. The cover plate and the housing form a reliable sealed connection with the housing during the welding process. The welding bead is an area for welding the cover plate and the housing. The design of the welding bead can improve the firmness of the welding between the cover plate and the housing, improve the welding yield, ensure that the welding scar does not protrude during welding, and secondary repair welding can be performed when there are welding defects, improving the positioning accuracy of the subsequent production process of the battery.

[0007] In some embodiments, the outer peripheral wall of the housing and the outer peripheral wall of the cover plate jointly define the welding bead, and the welding bead extends along the circumferential direction of the housing.

[0008] In some embodiments, the outer peripheral wall of the housing has a first welding bead surface, and the first welding bead surface extends obliquely toward the side where the cover plate is located and toward the central axis of the housing; the outer peripheral wall of the cover plate has a second welding bead surface, and the second welding bead surface extends obliquely toward the side where the housing is located and toward the central axis of the housing. The first welding bead surface and the second welding bead surface jointly define the welding bead.

[0009] In some embodiments, both the first bead surface and the second bead surface are formed as flat surfaces.

[0010] In some embodiments, the included angle between the first bead surface and the second bead surface is α, and α satisfies: 25° ≤ α ≤ 35°.

[0011] In some embodiments, both the first bead surface and the second bead surface are formed as arc surfaces.

[0012] In some embodiments, the radius of both the first bead surface and the second bead surface is R, and R satisfies: 0.5 mm < R ≤ 1.5 mm.

[0013] In some embodiments, the cross-sectional shape of the bead is V-shaped or U-shaped.

[0014] In some embodiments, a groove is formed on the cover plate, and the groove is located radially inside the bead along the housing; one end of the housing is open, and a protrusion is provided at the open end of the housing, and the protrusion is fitted in the groove.

[0015] In some embodiments, the gap between the side wall of the groove and the protrusion is L, and L satisfies: 0.05 mm ≤ L ≤ 0.1 mm.

[0016] The electrical 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.

[0017] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and be easily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0019] Figure 1 is a schematic diagram of a battery according to an embodiment of the present invention.

[0020] Figure 2 is a cross-sectional schematic diagram of an embodiment of a battery according to an embodiment of the present invention.

[0021] Figure 3 is Figure 2 an enlarged schematic diagram of the P region in

[0022] Figure 4 is a cross-sectional schematic diagram of another embodiment of a battery according to an embodiment of the present invention.

[0023] Figure 5 isFigure 4 Enlarged schematic view of the Q region in the middle.

[0024] Reference numerals:

[0025] 100, battery;

[0026] 10, cover plate; 11, groove;

[0027] 20, housing; 21, protrusion;

[0028] 30, weld bead; 31, first weld bead surface; 32, second weld bead surface;

[0029] A, height direction. Detailed implementation manners

[0030] The embodiments of the present utility model will be described in detail below. The embodiments described with reference to the drawings are exemplary. Below, reference is made to Figures 1-5 Describe the battery 100 according to the embodiments of the present utility model, including: a housing 20 and a cover plate 10. The battery 100 has a height direction A.

[0031] Specifically, as Figures 1-5 shown, a weld bead 30 is defined between the cover plate 10 and the housing 20, and the cover plate 10 and the housing 20 are welded at the weld bead 30.

[0032] Combined with Figures 1-5 , the cover plate 10 cooperates with the housing 20. The cover plate 10 is fitted at one end of the housing 20 along the height direction A, and a weld bead 30 is defined at the connection between the cover plate 10 and the housing 20. The cover plate 10 and the housing 20 are fixedly connected by welding. The weld bead 30 is the weld seam or welding area generated during the welding process of the cover plate 10 and the housing 20. Weld scars will be generated during the welding process of the cover plate 10 and the housing 20. Weld scars refer to the traces formed by the re-solidification of slag, oxides, gases, etc. formed during the welding process after welding. The setting of the weld bead 30 is suitable for accommodating weld scars.

[0033] According to the battery 100 of the embodiments of the present utility model, the housing 20 is suitable for providing physical support and protection for the electrode assembly inside the battery 100, and at the same time serves as an external barrier of the battery 100 to prevent external substances from invading. The cover plate 10 is a closed component at the top of the battery 100. The cover plate 10 matches the housing 20, and a reliable sealed connection is formed between the cover plate 10 and the housing 20 during the welding process. The weld bead 30 is the area for welding the cover plate 10 and the housing 20. The design of the weld bead 30 can improve the firmness of the welding between the cover plate 10 and the housing 20, improve the welding yield, ensure that the weld scars do not protrude during welding, and secondary repair welding can be performed when there are welding defects, improving the positioning accuracy of the subsequent processes of the battery 100.

[0034] According to some embodiments of the present utility model, asFigures 1-5 As shown, the outer peripheral wall of the housing 20 and the outer peripheral wall of the cover plate 10 jointly define a weld bead 30, and the weld bead 30 extends circumferentially along the housing 20.

[0035] The outer peripheral wall of the housing 20 and the outer peripheral wall of the cover plate 10 jointly define a continuous annular weld bead 30. The edges of the housing 20 and the cover plate 10 are in contact with each other during assembly. The weld bead 30 extends along the circumferential profile of the housing 20, and the weld bead 30 is recessed from the connection between the housing 20 and the cover plate 10 towards the center of the battery 100 along the radial direction of the battery 100.

[0036] Thus, the circumferentially extending weld bead 30 increases the strength of the connection area between the housing 20 and the cover plate 10, enabling the battery 100 to withstand higher mechanical stresses, such as impacts in accidental situations like dropping and collision, and reducing the risk of battery 100 failure due to physical damage. During the welding process, the annular weld bead 30 can contribute to the uniform distribution of stress, reduce the concentrated stress in the welding area, prevent or reduce the deformation and crack generation in the heat-affected zone of welding, and also ensure the continuity and tightness of welding, effectively improving the reliability and safety of the battery 100.

[0037] According to some embodiments of the present invention, as Figure 3 and Figure 5 shown, the outer peripheral wall of the housing 20 has a first weld bead surface 31, and the first weld bead surface 31 extends obliquely towards the side where the cover plate 10 is located and towards the central axis of the housing 20; the outer peripheral wall of the cover plate 10 has a second weld bead surface 32, and the second weld bead surface 32 extends obliquely towards the side where the housing 20 is located and towards the central axis of the housing 20. The first weld bead surface 31 and the second weld bead surface 32 jointly define the weld bead 30.

[0038] One side of the first weld bead surface 31 adjacent to the cover plate 10 along the height direction A of the battery 100 is butted against one side of the second weld bead surface 32 adjacent to the housing 20 along the height direction A of the battery 100. The first weld bead surface 31 and the second weld bead surface 32 cooperate to form a "V"-shaped weld bead 30, and the "V"-shaped weld bead 30 is recessed towards the central axis of the housing 20. The inclination directions of the first weld bead surface 31 and the second weld bead surface 32 correspond to each other to ensure that when the cover plate 10 and the housing 20 are assembled, a continuous weld bead 30 that conforms to a preset angle is formed.

[0039] Thus, the first weld bead surface 31 and the second weld bead surface 32 are obliquely arranged to form a structure along the "V"-shaped weld bead 30, which can make the heat distribution during welding more uniform, the solder easier to flow and fill the weld bead 30, and at the same time increase the contact area of the welding interface, improving the welding firmness and sealing effect between the cover plate 10 and the housing 20, and enhancing the overall structural strength of the battery 100.

[0040] According to some embodiments of the present invention, asFigure 2 As shown, the first weld bead surface 31 and the second weld bead surface 32 are both formed into planes. The first weld bead surface 31 and the second weld bead surface 32 form a closed weld bead 30 that extends both radially and circumferentially. The plane is easier to process and measure. The first weld bead surface 31 and the second weld bead surface 32 are planes, which is more conducive to standardizing welding parameters, making the welding process easier to control and improving the consistency of welding quality. Therefore, the first weld bead surface 31 and the second weld bead surface 32 are both formed into planes, which can simplify the mold design and processing difficulty in the manufacturing process of the shell 20 and the cover plate 10, and reduce the manufacturing cost of the battery 100.

[0041] According to some embodiments of the present invention, Figure 3 As shown, the included angle between the first weld bead surface 31 and the second weld bead surface 32 is α, and α satisfies: 25°≤α≤35°.

[0042] If the angle α between the first weld bead surface 31 and the second weld bead surface 32 is less than 25°, the angle between the first weld bead surface 31 and the second weld bead surface 32 is too small, which may reduce the penetration depth and cause a weak weld scar, resulting in low welding strength. If the angle α between the first weld bead surface 31 and the second weld bead surface 32 is greater than 35°, the angle between the first weld bead surface 31 and the second weld bead surface 32 is too large, which may cause excessive heat input during welding, affect welding performance and may cause deformation. For example, α = 30°.

[0043] Thus, by limiting the angle range between the first weld bead surface 31 and the second weld bead surface 32, a good ratio of penetration depth to penetration width can be achieved, which is helpful for the effective distribution of heat during welding, reduces the risk of local overheating, and prevents defects such as welding cracks and pores. Appropriate heat distribution also helps to control welding deformation, so that the workpiece maintains good dimensional stability and precision, ensures welding quality and improves work efficiency. In addition, it can also promote the smooth flow of welding materials in the weld bead 30, help to form a uniform weld scar cross section, and improve the mechanical properties of the connection between the cover plate 10 and the shell 20.

[0044] According to some embodiments of the present invention, Figure 5 As shown, the first weld bead surface 31 and the second weld bead surface 32 are both formed as arc surfaces.

[0045] The first weld bead surface 31 and the second weld bead surface 32 cooperate to form a "U"-shaped weld bead 30, and the "U"-shaped weld bead 30 is formed concavely toward the direction of the central axis of the shell 20. The shape of the "U"-shaped weld bead 30 can provide a larger contact area and a deeper welding depth, providing more molten material filling space for the welding process, helping to form a full and uniform weld scar, and facilitating the control of welding quality.

[0046] Thus, both the first weld bead surface 31 and the second weld bead surface 32 are formed as arc surfaces, so that the weld bead 30 is formed into a "U" - shaped structure. The "U" - shaped weld bead 30 structure helps to disperse the stress generated during welding and working conditions, reduce the stress concentration phenomenon at the weld scar, thereby reducing the risk of cracking or deformation and enhancing the overall stability of the structure. When withstanding external impacts or internal pressure changes, the "U" - shaped weld bead 30 can provide more support, enhance the mechanical strength at the connection between the housing 20 and the cover plate 10, and improve the overall durability and safety of the battery 100.

[0047] According to some embodiments of the present utility model, as Figure 5 shown, the radii of the first weld bead surface 31 and the second weld bead surface 32 are R, and R satisfies: 0.5 mm < R ≤ 1.5 mm.

[0048] If the radii R of the first weld bead surface 31 and the second weld bead surface 32 are less than 0.5 mm, the radii of the first weld bead surface 31 and the second weld bead surface 32 are too small, resulting in too small a radius of the weld bead 30. The too - small radius of the weld bead 30 will increase the difficulty of the welding process. If the radii R of the first weld bead surface 31 and the second weld bead surface 32 are greater than 1.5 mm, the radius of the weld bead 30 is too large, which is not conducive to improving the production accuracy of the housing 20 and the cover plate 10. For example, R = 1 mm.

[0049] Thus, by limiting the radius range of the first weld bead surface 31 and the second weld bead surface 32, that is, limiting the radius range of the weld bead 30, the best welding effect can be ensured, good welding strength and appearance can be maintained, the tensile, shear and other mechanical properties of the weld scar can be improved, and the reliability and stability of the battery 100 can be enhanced.

[0050] According to some embodiments of the present utility model, as Figure 3 and Figure 5 shown, the cross - sectional shape of the weld bead 30 is V - shaped or U - shaped.

[0051] The cross - sectional shape of the V - shaped weld bead 30 is like the letter "V", with a relatively sharp bottom and the two side inclined planes intersecting at a point. The V - shaped weld bead 30 design can provide a larger penetration depth and is suitable for thick - plate materials that require high - strength welding. Before welding, the V - shaped groove can more easily remove the oxide scale and other impurities on the material surface to ensure the welding quality. The cross - sectional shape of the U - shaped weld bead 30 is similar to the letter "U", with a relatively wide and flat bottom and relatively gentle side inclined planes. Compared with the V - shaped one, the U - shaped weld bead 30 has a larger opening and a wider bottom. Due to its wider bottom, the U - shaped weld bead 30 can accommodate more welding filler materials, which is suitable for quickly filling the weld bead 30 and improving the welding efficiency.

[0052] Thus, whether the cross-sectional shape of the weld bead 30 is V-shaped or U-shaped can improve the connection strength of the welding between the cover plate 10 and the housing 20, enhance the welding efficiency, ensure that the weld bead does not bulge during welding, enable secondary repair welding when there are welding defects, improve the welding yield, and increase the positioning accuracy in the subsequent processes of the battery 100.

[0053] According to some embodiments of the present invention, as Figure 3 and Figure 5 shown, a groove 11 is formed on the cover plate 10, and the groove 11 is located radially inside the weld bead 30 along the housing 20; one end of the housing 20 is open, and a protrusion 21 is provided at one end of the housing 20, and the protrusion 21 is fitted into the groove 11.

[0054] A groove 11 is formed at one end of the cover plate 10 adjacent to the housing 20 along the height direction A of the battery 100. The groove 11 is recessed from a part of the end face of one end of the cover plate 10 along the height direction A away from the housing 20, and the groove 11 extends circumferentially along the cover plate 10. A protrusion 21 is provided at one end of the housing 20 adjacent to the cover plate 10 along the height direction A of the battery 100. The protrusion 21 protrudes from a part of the end face of one end of the housing 20 along the height direction A towards the cover plate 10, and the protrusion 21 extends circumferentially along the housing 20. The groove 11 on the cover plate 10 matches the protrusion 21 on the housing 20. When the cover plate 10 and the housing 20 are assembled, the protrusion 21 of the housing 20 is embedded into the groove 11 of the cover plate 10. Since the groove 11 is located inside the weld bead 30, when the groove 11 and the protrusion 21 are assembled, they are located inside the cover plate 10 and are not directly exposed in the peripheral welding area.

[0055] Thus, through the cooperation of the groove 11 and the protrusion 21, the protrusion 21 is embedded into the groove 11, which can achieve preliminary positioning and fixation, prepare for the welding step, ensure good alignment between the cover plate 10 and the housing 20 before welding, reduce welding quality problems caused by misalignment during welding, achieve mechanical interlock between the cover plate 10 and the housing 20, effectively improve the welding quality and efficiency, and reduce the rework rate. Moreover, after the welding between the cover plate 10 and the housing 20 is completed, the cooperation of the protrusion 21 and the groove 11 plus the surrounding welding seal form a double guarantee, which not only strengthens the physical connection strength of the welding part but also further improves the sealing performance of the battery 100, helps prevent the influence of the external environment on the inside of the battery 100, optimizes the assembly process of the battery 100, improves the reliability of the battery 100, and extends the service life of the battery 100.

[0056] According to some embodiments of the present invention, as Figure 3 and Figure 5 shown, the gap between the side wall of the groove 11 and the protrusion 21 is L, and L satisfies: 0.05 mm ≤ L ≤ 0.1 mm.

[0057] The existence of the gap can ensure that the protrusion 21 can smoothly enter the groove 11. If the gap between the side wall of the groove 11 and the protrusion 21 is less than 0.05 mm, it will be difficult to assemble the protrusion 21 and the groove 11 due to the too tight size. If the gap between the side wall of the groove 11 and the protrusion 21 is greater than 0.1 mm, the fit between the protrusion 21 and the groove 11 will be relatively loose, which is not conducive to the welding process. For example, L = 0.05 mm.

[0058] Therefore, by defining the size range of the gap between the side wall of the groove 11 and the protrusion 21, the tightness of the fit between the groove 11 and the protrusion 21 can be ensured, the assembly resistance can be reduced, the assembly speed can be increased, and the generation of excessive local stress caused by the too tight fit between the cover plate 10 and the housing 20 can be avoided, making the fit between the cover plate 10 and the housing 20 more stable and firm, and improving the durability of the battery 100.

[0059] The electrical device according to the second aspect embodiment of the present invention includes the battery 100 in the above embodiment.

[0060] The electrical device according to the embodiment of the present invention, by using the battery 100 described in the above embodiment, realizes efficient and reliable welding and sealing through the housing 20 and the cover plate 10 designed with specific weld beads 30, ensuring the stability of the internal environment of the battery 100 and the isolation from external substances. The design of the weld beads 30 takes into account the material flow, stress distribution and weld scar control during the welding process, improves the welding quality, reduces the defect rate, and is also convenient for quality control and possible secondary repair welding. The high sealing performance and reinforced structure design of the battery 100 reduce the failure risk of the battery 100 and improve the overall operation safety of the electrical device. The optimized welding and structure design helps to reduce the performance attenuation of the battery 100 during long-term use and extend the service life of the electrical device.

[0061] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "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, and 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, and therefore should not be construed as a limitation to the present utility model. 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 of" 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.

[0062] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic 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 representations of the above terms do not necessarily refer to the same embodiment or example.

[0063] 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, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery, characterized in that: include: A shell, wherein the outer peripheral wall of the shell has a first weld surface; A cover plate, wherein the outer peripheral wall of the cover plate has a second weld bead surface, the second weld bead surface extends obliquely along the side where the shell is located and toward the central axis of the shell, the first weld bead surface extends obliquely along the side where the cover plate is located and toward the central axis of the shell, a weld bead is defined between the second weld bead surface of the cover plate and the first weld bead surface of the shell, and the cover plate and the shell are welded at the weld bead.

2. The battery according to claim 1, characterized in that The outer peripheral wall of the shell and the outer peripheral wall of the cover plate jointly define the weld bead, and the weld bead extends along the circumference of the shell.

3. The battery according to claim 1, characterized in that The first weld bead surface and the second weld bead surface are both formed into planes.

4. The battery according to claim 3, characterized in that The angle between the first weld bead surface and the second weld bead surface is α, and α satisfies: 25°≤α≤35°.

5. The battery according to claim 1, characterized in that The first weld bead surface and the second weld bead surface are both formed as arc surfaces.

6. The battery according to claim 5, characterized in that The radius of the first weld bead surface and the second weld bead surface is R, and R satisfies: 0.5 mm<R≤1.5 mm.

7. The battery according to claim 1, characterized in that The cross-sectional shape of the weld is V-shaped or U-shaped.

8. The battery according to any one of claims 1 to 7, characterized in that A groove is formed on the cover plate, and the groove is located on the radial inner side of the weld bead along the shell; One end of the shell is open, and a protrusion is provided on the one end of the shell, and the protrusion is fitted in the groove.

9. The battery according to claim 8, characterized in that A gap L is provided between the side wall of the groove and the protrusion, and L satisfies: 0.05 mm ≤ L ≤ 0.1 mm.

10. An electrical device, characterized in that: Comprising a battery according to any one of claims 1-9.

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