Shell, battery, battery pack and electric equipment

Abstract

The utility model relates to a shell, a battery, a battery pack and electric equipment. The shell comprises a middle frame, a top plate and a bottom plate; turnups facing the middle frame are arranged at the corners of the top plate and / or the bottom plate, the top plate and the bottom plate are assembled on the upper side and the lower side of the middle frame respectively, and the turnups are located on the outer side of the middle frame. The shell provided by the utility model is relatively low in assembly and welding difficulty, and the assembly and welding efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, and more specifically, the utility model relates to a housing, a battery, a battery pack and an electrical device. Background Art

[0002] In the prior art, the connection mode between the frame and the cover plate of the battery is usually horizontal lap welding, which has great welding difficulty, affects the assembly and welding efficiency of the housing. In addition, the strength at the corner of the cover plate is usually weak, resulting in cracking at this position easily when the welded housing drops, affecting the drop performance of the battery. Summary of the Utility Model

[0003] An object of the utility model is to provide a housing, a battery, a battery pack and an electrical device.

[0004] According to an aspect of the utility model, a housing is provided, including:

[0005] A middle frame, a top plate and a bottom plate;

[0006] Flanges facing the middle frame are provided at the corners of the top plate and / or the bottom plate, and the top plate and the bottom plate are respectively assembled on the upper and lower sides of the middle frame, so that the flanges are located outside the middle frame.

[0007] Optionally, an assembly notch is provided at a position on the outside of the middle frame corresponding to the flange, and the shape of the assembly notch matches the shape of the flange.

[0008] Optionally, the thickness of the assembly notch is less than or equal to 1 / 2 of the thickness of the middle frame.

[0009] Optionally, the stretching length of the flange is 0.5 mm to 1.5 mm.

[0010] Optionally, the shape of the flange is semicircular, oval or U-shaped.

[0011] Optionally, the flange is formed by stretching through a stamping process.

[0012] Optionally, the corner is the connection between two adjacent sides of the top plate or the bottom plate.

[0013] Optionally, the corner is an arc angle, and the radius of the arc angle is less than or equal to 3 mm.

[0014] Optionally, a pressure relief structure is provided on the top plate and / or the bottom plate near the corner.

[0015] Optionally, an accommodation cavity is formed inside the middle frame, the top plate and the bottom plate, and the accommodation cavity is used to place the battery cell;

[0016] An inward concave structure is provided on the peripheral side of the middle frame, and a first through hole and a second through hole are provided at the inward concave structure. The first through hole is used for liquid injection, and the second through hole is used for assembling the conductive post assembly.

[0017] According to a second aspect of the present invention, there is provided a battery, comprising: a battery cell and the housing described in the first aspect, wherein the battery cell is located in a receiving cavity formed by the top plate, the bottom plate and the middle frame.

[0018] Optionally, the battery further comprises a conductive post assembly, the conductive post assembly includes a lead-out piece, an inner insulating member, an outer insulating member and a conductive post, and a second through hole is provided at the side of the middle frame;

[0019] The inner insulating member and the lead-out piece are sequentially arranged inside the second through hole, the outer insulating member and the conductive post are sequentially arranged outside the second through hole, and the lead-out piece is connected to the battery cell, and a part of the conductive post passes through the second through hole and is connected to the lead-out piece.

[0020] According to a third aspect of the present invention, there is provided a battery pack, comprising the battery described in the second aspect.

[0021] According to a fourth aspect of the present invention, there is provided an electrical device, comprising the battery described in the second aspect or the battery pack described in the third aspect.

[0022] One technical effect of the present invention is that:

[0023] By providing flanges at the corners of the top plate and / or the bottom plate facing the middle frame, and the flanges are located outside the middle frame, on the one hand, the flanges can improve the flatness of the top plate and / or the bottom plate, and on the other hand, it can provide guidance and positioning for the welding of the top plate and / or the bottom plate to the middle frame, reducing the welding difficulty of the top plate and / or the bottom plate to the middle frame and improving the assembly and welding efficiency.

[0024] Through the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings, other features and advantages of the present invention will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings forming a part of the specification depict embodiments of the present invention and, together with the specification, are used to explain the principles of the present invention.

[0026] Figure 1 is a schematic structural diagram of a battery provided by the present invention.

[0027] Figure 2 is Figure 1 a partial enlarged view of C in

[0028] Figure 3 is Figure 1 The exploded view of the provided battery.

[0029] Figure 4 is the exploded view of a housing provided by the present utility model.

[0030] Figure 5 is the schematic diagram of a top plate provided by the present utility model.

[0031] Figure 6 is Figure 5 the partial enlarged view at position D in

[0032] Figure 7 is the schematic diagram of a bottom plate provided by the present utility model.

[0033] Figure 8 is this Figure 7 the partial enlarged view at position B in

[0034] Figure 9 is the schematic diagram of a middle frame provided by the present utility model.

[0035] Figure 10 is Figure 9 the partial enlarged view at position A in

[0036] Figure 11 is the exploded assembly view of a middle frame and a conductive post assembly provided by the present utility model.

[0037] Figure 12 is the schematic diagram of the weld track of the welded bottom plate and middle frame provided by the present utility model.

[0038] Figure 13 is Figure 1 the cross-sectional view at F-F in

[0039] Figure 14 is Figure 1 the cross-sectional view at E-E in

[0040] Explanation of reference numerals:

[0041] 1. Top plate; 11 / 31. Flange; 12. Pressure relief structure; 2. Middle frame; 21. First through hole; 22. Second through hole; 23. Assembly notch; 24. Concave structure; 3. Bottom plate; 4. Battery cell; 5. Lead-out piece; 6. Inner insulating part; 7. Outer insulating part; 8. Conductive post; 9. Sealing cover; 10. Rubber plug. Detailed implementation manners

[0042] The various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model.

[0043] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present utility model or its application or use.

[0044] Technologies and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies and devices should be regarded as part of the specification.

[0045] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Accordingly, other examples of the exemplary embodiments may have different values.

[0046] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0047] As Figures 1 to 14 shown, according to one aspect of the present utility model, a housing is provided, comprising: a middle frame 2, a top plate 1, and a bottom plate 3; at the corners of the top plate 1 and / or the bottom plate 3, flanges 11 / 31 are provided facing the middle frame 2, and the top plate 1 and the bottom plate 3 are respectively assembled on the upper and lower sides of the middle frame 2 (refer to Figure 4 ), such that the flanges 11 / 31 are located outside the middle frame 2.

[0048] Specifically, as Figures 3 to 4 shown, in practical applications, the shapes of the top plate 1 and the bottom plate 3 are generally consistent with the shape of the middle frame 2, and after assembly, they are usually connected by a welding process. However, due to the greater heat influence at the corners of the top plate 1 and / or the bottom plate 3, the strength is generally weaker than that of other regions, resulting in the housing formed by welding being prone to cracking directly under impact when dropped.

[0049] In this embodiment, the provided housing comprises a middle frame 2 and a top plate 1 and a bottom plate 3 provided on both sides of the middle frame 2. Among them, at the corners of the top plate 1 and / or the bottom, flanges 11 / 31 are provided, refer to Figures 5 to 8 . On the one hand, the design of the flanges 11 / 31 can provide positioning for the assembly and welding of the top plate 1 and / or the bottom plate 3 with the middle frame 2, reducing the assembly difficulty of the top plate 1 and / or the bottom plate 3 with the middle frame 2, as well as reducing the positioning accuracy requirements for the weld path, and improving the assembly and welding efficiency. In some embodiments, for example, when the bottom plate 3 and the middle frame 2 are of an integrally formed structure, only the corners of the top plate 1 need to be flanged 11.

[0050] On the other hand, after the top plate 1 and / or the bottom plate 3 are assembled with the middle frame 2, the flanges 11 / 31 are located outside the middle frame 2. Refer to Figures 1 to 2 , and Figure 13 , so that during the welding process, the weld track is located on the side of the middle frame 2 at the position of the flanges 11 / 31, reducing the thermal influence in the horizontal direction during welding at the corner, improving the welding strength, reducing the distortion of the bottom plate 3 and / or the top plate 1, and being beneficial to improving the distribution of thermal deformation. When this housing is applied to a battery, it is not easy to cause cracking at the corner during dropping. Its weld track refers to Figure 13 , which is the weld track formed when the bottom plate 3 is welded to the middle frame 2. The weld at the flange 31 is located on the side of the middle frame 2 and is not in the same horizontal plane as the welds of the other parts, reducing the influence of heat during welding on the corner.

[0051] In the above embodiment, the welding method of the bottom plate 3 and / or the top plate 1 with the middle frame 2 can adopt ultrasonic welding, hot melt welding, laser welding, etc. The shapes of the top plate 1 and / or the top plate 1 and the middle frame 2 can correspond to square, polygon, special shape (such as L-shaped), etc. In addition, when the bottom plate 3 and / or the top plate 1 have multiple corners, the sizes and shapes of the flanges 11 / 31 at each corner can be designed as the same structure or different structures, and the present utility model does not limit this.

[0052] Optionally, the corner is the connection between two adjacent sides of the top plate 1 or the bottom plate 3. In practical applications, the corner is usually the connection between two adjacent sides of the top plate 1 or the bottom plate 3. For example, in one embodiment, the top plate 1 and the bottom plate 3 are rectangular plate members, and the corner is the connection between the long side and the short side. As Figure 1 shown, the position shown at C is a corner on the top plate 1.

[0053] Optionally, as Figures 9 to 10 shown, an assembly notch 23 is provided at the position of the outer side of the middle frame 2 corresponding to the flanges 11 / 31, and the shape of the assembly notch 23 matches the shape of the flanges 11 / 31.

[0054] Specifically, in this embodiment, by providing the assembly notch 23 on the middle frame 2, the assembly difficulty of the bottom plate 3 and / or the top plate 1 with the middle frame 2 is further reduced. And outside the assembled housing, the flanges 11 / 31 are located within the assembly notch 23, without occupying the external space of the housing. While further reducing the assembly and welding difficulties, the aesthetics of the housing is also improved. Among them, the assembly notch 23 can be processed by thinning the middle frame 2, and the thinned position and size correspond and match the flanges 11 / 31 to better provide positioning and guiding functions for the assembly of the bottom plate 3 and / or the top plate 1 with the middle frame 2.

[0055] Optionally, as Figures 13 to 14 shown, the thickness of the assembly notch 23 is less than or equal to 1 / 2 of the thickness of the middle frame 2.

[0056] Specifically, in practical applications, the thickness of the middle frame 2 affects the strength of the entire housing. If the thickness of the assembly notch 23 is too large, it will result in relatively weak strength of the middle frame 2 at this location. By setting the thickness of the assembly notch 23 to be less than or equal to 1 / 2 of the thickness of the middle frame 2, it can not only achieve the positioning and guiding effects for the flanges 11 / 31, but also take into account the strength of the middle frame 2. In some embodiments, the thickness of the middle frame 2 can be designed to be 15um - 500um, which can be specifically designed according to actual requirements.

[0057] Optionally, the stretching length of the flange 11 / 31 is 0.5mm - 1.5mm.

[0058] Specifically, if the stretching length of the flange 11 / 31 is too long, it will increase the processing difficulty, and when setting the assembly notch 23 on the middle frame 2, it will also result in a relatively large size of the assembly notch 23, affecting its strength. If the stretching length is too short, it will affect the positioning and guiding effects, and the finally formed weld seam will be too close to one side of the top plate 1 and / or the bottom plate 3, which is not conducive to reducing the welding difficulty at the corner.

[0059] In this embodiment, by setting the stretching length of the flange to be 0.5mm - 1.5mm, for example, when it is 1mm, it can not only achieve the purpose of reducing the assembly and welding difficulties, but also reduce the processing difficulty and ensure the strength of the middle frame 2.

[0060] Optionally, as Figures 5 to 10 shown, the shape of the flange 11 / 31 is semicircular, elliptical or U-shaped.

[0061] Specifically, in practical applications, the shape of the flange 11 / 31 can be square, semicircular, elliptical, special-shaped (such as V-shaped, U-shaped, etc.) to meet different requirements. In this embodiment, the shape of the flange 11 / 31 is designed to be a shape with a relatively gentle transition such as circular, elliptical or U-shaped, so that the finally formed weld seam trajectory has no sudden change, which can not only reduce the welding difficulty, but also improve the welding quality.

[0062] Optionally, the flange 11 / 31 is formed by stretching using a stamping process.

[0063] Specifically, in this embodiment, the flanging 11 / 31 can be produced by stamping devices such as a stretching die and a punching press, so that the stamped bottom plate 3 and / or top plate 1 can improve the flatness of the entire bottom plate 3 and / or top plate 1 through stretching at the flanging 11 / 31 during the stamping process. On the one hand, it is beneficial to the assembly of the bottom plate 3 and / or top plate 1 and the middle frame 2. On the other hand, when this housing is applied to a battery, it can ensure the overall size of the battery cell 4 located inside the housing and guarantee the battery capacity.

[0064] Optionally, as Figures 1 to 4 shown, the corner is an arc angle, and the radius of the arc angle is less than or equal to 3 mm.

[0065] Specifically, in practical applications, the corner is usually designed as an arc angle to improve the strength at the corner. When the radius of the arc angle is small, such as 1 mm or 2 mm, setting the flanging 11 / 31 here can not only improve the assembly and welding efficiency, but also further improve the strength at the corner.

[0066] Optionally, as Figure 1 shown, a pressure relief structure is provided on the top plate 1 and / or the bottom plate 3 near the corner. Among them, the pressure relief structure 12 can be a pressure relief valve or a notch.

[0067] Specifically, when the housing is applied to a battery, the pressure relief structure 12 can discharge the excess gas generated by the battery cell 4 inside the housing, thereby reducing the air pressure inside the battery and helping to prevent dangerous situations such as the battery bursting and catching fire due to excessive internal pressure, ensuring the safe operation of the battery. In this embodiment, the pressure relief structure 12 can be processed on the top plate 1 and / or the bottom plate 3 through processes such as stamping and laser etching.

[0068] Optionally, as Figures 3 to 4 shown, an accommodation cavity is formed inside the top plate 1 and the bottom plate 3 and the middle frame 2, and the accommodation cavity is used to place the battery cell 4 of the battery; an inward concave structure 24 is provided on the peripheral side of the middle frame 2 (refer to Figure 4 ), a first through hole 21 and a second through hole 22 are provided at the inward concave structure 24, the first through hole 21 is used for liquid injection, and the second through hole 22 is used for assembling the conductive post 8 assembly.

[0069] Specifically, when the housing is applied to a battery, a liquid injection port for liquid injection and a conductive post 8 assembly for leading out electrodes are required. Among them, the conductive post 8 assembly usually protrudes from the housing and easily occupies the space outside the housing. In this embodiment, when the middle frame 2 is bent and formed, an inward folding design can be made on one side of the middle frame 2 to form an inward concave structure 24 concave toward the inside of the housing, so that after the conductive post 8 assembly is assembled through the second through hole 22, it will not protrude too much from the outside of the housing, saving the space outside the housing.

[0070] In addition, the accommodation cavity formed by the top plate 1 and the bottom plate 3 and the interior of the middle frame 2 can be used to place the battery cell 4 to meet the charge and discharge functions of the battery.

[0071] According to the second aspect of the present utility model, as Figures 1 to 3 shown, a battery is provided, comprising: a battery cell 4 and the housing described in the first aspect, and the battery cell 4 is located in the accommodation cavity formed by the top plate 1, the bottom plate 3 and the middle frame 2.

[0072] Specifically, in this embodiment, the battery uses the housing provided in the first aspect of the present utility model. Since its assembly and welding difficulties are relatively low, and the weld seam formed at the corner after welding is located on the side edge of the middle frame 2, the entire weld seam trajectory has a relatively small thermal influence on the corner. When the housing drops, problems such as cracking at the corner are not likely to occur, improving the drop performance and safety performance of the battery.

[0073] Optionally, as Figure 11 shown, the battery further includes a conductive post 8 assembly, and the conductive post 8 assembly includes a lead-out piece 5, an inner insulating member 6, an outer insulating member 7 and a conductive post 8. A second through hole 22 is provided at the side edge of the middle frame 2; the inner insulating member 6 and the lead-out piece 5 are sequentially arranged inside the second through hole 22, the outer insulating member 7 and the conductive post 8 are sequentially arranged outside the second through hole 22, and the lead-out piece 5 is connected to the battery cell 4, and a part of the conductive post 8 passes through the second through hole 22 and is connected to the lead-out piece 5.

[0074] Specifically, in this embodiment, the housing (bottom plate 3, top plate 1 and middle frame 2) of the battery is a conductor and can be made of materials such as steel, aluminum alloy, ferroalloy, etc. When the battery cell 4 is assembled in the housing, its positive and negative electrodes can be connected through the bottom plate 3 and the top plate 1 respectively. In addition, a second through hole 22 is provided on the side edge of the middle frame 2, which enables the positive or negative electrode of the battery cell 4 to be led out of the housing through the conductive post 8 assembly.

[0075] In the above embodiment, the lead-out piece 5 is connected to the battery cell 4, and a part of the conductive post 8 passes through the second through hole 22 and is connected to the lead-out piece 5 to realize the lead-out of the electrode. To avoid short circuit, inner insulating sheets and outer insulating sheets are respectively arranged between the lead-out piece 5, the conductive post 8 and the middle frame 2 to improve the safety performance of the battery. Among them, the inner insulating sheet and the outer insulating sheet can be formed into a whole by integral injection molding. In addition, a liquid injection port (first through hole 21) is also provided on the housing for injecting liquid into the battery cell 4, and the liquid injection port can be sealed by a rubber plug 10 and a sealing cover 9.

[0076] According to the third aspect of the present utility model, a battery pack is provided, comprising the battery described in the second aspect.

[0077] Specifically, in this embodiment, the battery pack can be formed by using multiple batteries provided in the second aspect. Since the batteries have good drop performance, the safety of the battery pack is improved.

[0078] According to the fourth aspect of the present invention, there is provided an electrical device, including the battery described in the second aspect or the battery pack described in the third aspect.

[0079] Specifically, in this embodiment, the electrical device uses the battery provided in the second aspect or the battery pack described in the third aspect, which has good drop performance and improves the safety of the electrical device.

[0080] In the above embodiments, the differences between the various embodiments are mainly described. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a more optimal embodiment. Considering the simplicity of the text, it will not be elaborated here.

[0081] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A housing, characterized in that: include: middle frame, top plate and bottom plate; The top plate and / or the bottom plate are provided with flanges facing the middle frame at the corners, and the top plate and the bottom plate are respectively assembled at the upper and lower sides of the middle frame so that the flanges are located on the outside of the middle frame.

2. The housing according to claim 1, characterized in that An assembly notch is provided on the outer side of the middle frame at a position corresponding to the flange, and the shape of the assembly notch matches the shape of the flange.

3. The housing according to claim 2, characterized in that: The thickness of the assembly notch is less than or equal to 1 / 2 of the thickness of the middle frame.

4. The housing according to claim 1, characterized in that The stretching length of the flange is 0.5 mm to 1.5 mm.

5. The housing according to claim 1, characterized in that The shape of the flange is semicircular, elliptical or U-shaped.

6. The housing according to claim 1, characterized in that The flange is formed by stretching through a stamping process.

7. The housing according to claim 1, characterized in that The corner is the connection between two adjacent sides of the top plate or the bottom plate.

8. The housing according to claim 1, characterized in that The corner is an arc angle, and the radius of the arc angle is less than or equal to 3 mm.

9. The housing according to claim 1, characterized in that A pressure relief structure is arranged on the top plate and / or the bottom plate near the corner.

10. The housing according to any one of claims 1 to 9, characterized in that: The top plate, the bottom plate and the interior of the middle frame form a receiving cavity, and the receiving cavity is used to place the battery cell; A concave structure is provided on the peripheral side of the middle frame, and a first through hole and a second through hole are provided at the concave structure. The first through hole is used for liquid injection, and the second through hole is used for assembling a conductive column assembly.

11. A battery, characterized in that: include: A battery cell and a shell as described in any one of claims 1 to 10, wherein the battery cell is located in a receiving cavity formed by the top plate, the bottom plate and the middle frame.

12. The battery according to claim 11, characterized in that It also includes a conductive column assembly, the conductive column assembly includes a lead-out sheet, an inner insulating member, an outer insulating member and a conductive column, and a second through hole is provided at a side of the middle frame; The inner insulating member and the lead-out piece are sequentially arranged on the inner side of the second through hole, the outer insulating member and the conductive column are sequentially arranged on the outer side of the second through hole, and the lead-out piece is connected to the battery core, and a part of the conductive column passes through the second through hole and is connected to the lead-out piece.

13. A battery pack, characterized in that: A battery comprising the battery according to claim 11 or 12.

14. An electrical device, characterized in that: Includes the battery according to claim 11 or 12, or includes the battery pack according to claim 13.

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