Battery shell based on splicing structure

Abstract

The utility model discloses a battery shell based on a splicing structure, the battery shell is provided with a shell body and a shell bottom, the battery shell comprises a U-shaped splicing assembly, a first splicing plate and a second splicing plate, the first splicing plate and the second splicing plate are welded and fixed with the U-shaped splicing assembly, the U-shaped splicing assembly comprises a bottom plate, a first vertical plate and a second vertical plate, the first vertical plate and the second vertical plate are respectively arranged on two sides of the bottom plate, and the first vertical plate and the second vertical plate are connected with the bottom plate. The bottom plate forms the shell bottom of the battery shell, and the first splicing plate and the second splicing plate are spliced with the first vertical plate and the second vertical plate to form the shell body. According to the utility model, the battery shell is formed by splicing the three parts, and the U-shaped splicing assembly is of an integrally formed structure, so that the bottom plate is not an independent component any more, and the problem that the bottom plate is easy to fall off after being welded is solved; the bottom plate does not need to be positioned in the welding process, so that the steps of milling a step structure and grooving on the bottom plate can be removed, the wall thickness of the bottom plate can be reduced to be the same as that of the side plate, and the production is simpler.

Description

Technical Field

[0001] The utility model belongs to the field of secondary batteries, and in particular relates to a battery shell based on a splicing structure. Background Art

[0002] The shape of existing battery shells (such as the shell of blade batteries) is generally a rectangular parallelepiped, including a side panel assembly for forming four side panels of the shell and a battery bottom cover for closing the opening at the lower end of the side panel assembly. The manufacturing method is generally to first punch out the battery bottom cover and the side panel assembly in the unfolded state, and then bend the side panel assembly into a rectangular cylindrical shape and then weld it to form four side panels, and form a side weld in the middle of one of the side panels. Finally, the battery bottom cover is placed in an opening formed by the four side panels, and the four sides of the battery bottom cover are welded to obtain a battery shell; the other opening formed by the four side panels is used to install the battery top cover. However, the battery bottom cover is not easy to position during welding, and it is generally necessary to form steps around the battery bottom cover as a positioning structure, which increases the thickness of the battery bottom cover and increases the difficulty of manufacturing. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a battery casing based on a splicing structure.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] A battery shell based on a splicing structure has a shell body and a shell bottom. The battery shell includes a "U"-shaped splicing assembly and a first splicing plate and a second splicing plate welded and fixed to the "U"-shaped splicing assembly. The "U"-shaped splicing assembly includes a bottom plate and a first vertical plate and a second vertical plate respectively arranged on both sides of the bottom plate. The bottom plate forms the shell bottom of the battery shell, and the first splicing plate and the second splicing plate are spliced ​​with the first vertical plate and the second vertical plate to form the shell body.

[0006] Furthermore, the battery shell is a rectangular parallelepiped with a top opening at the top, and the bottom plate is located directly below the top opening; the shell body includes a first side plate, a second side plate, a third side plate and a fourth side plate, the first side plate and the third side plate are arranged opposite to each other, and the second side plate and the fourth side plate are arranged opposite to each other.

[0007] Furthermore, the bottom plate, the first vertical plate and the second vertical plate are integrally formed.

[0008] Further, one side of the "U"-shaped splicing assembly is provided with a first side opening, and the other side is provided with a second side opening, the first splicing plate is provided at the first side opening, the two side edges of the first splicing plate are respectively welded and fixed to the first vertical plate and the second vertical plate, and the bottom edge of the first splicing plate is welded and fixed to the bottom plate; the first splicing plate is welded to form a first weld at the position where it connects with the first vertical plate, the first splicing plate is welded to form a second weld at the position where it connects with the second vertical plate, and the first splicing plate is welded to form a third weld at the position where it connects with the bottom plate;

[0009] The second splicing plate is provided with a second side opening, and the two side edges of the second splicing plate are respectively welded and fixed to the first vertical plate and the second vertical plate, and the bottom edge of the second splicing plate is welded and fixed to the bottom plate; the second splicing plate is welded at the position where it connects with the first vertical plate to form a fourth weld, the second splicing plate is welded at the position where it connects with the second vertical plate to form a fifth weld, and the second splicing plate is welded at the position where it connects with the bottom plate to form a sixth weld.

[0010] Furthermore, the first weld, the second weld and the third weld are all located on the outer side of the first splicing plate, and the fourth weld, the fifth weld and the sixth weld are all located on the outer side of the second splicing plate.

[0011] Furthermore, the first splicing plate and the second splicing plate are symmetrically arranged, and the first vertical plate and the second vertical plate are symmetrically arranged;

[0012] The width of the first splicing plate and the second splicing plate is greater than the width of the first vertical plate and the second vertical plate, or the width of the first vertical plate and the second vertical plate is greater than the width of the first splicing plate and the second splicing plate.

[0013] Furthermore, the "U"-shaped splicing assembly is formed by stamping a stainless steel material, and the wall thicknesses of the "U"-shaped splicing assembly, the first splicing plate and the second splicing plate are all 0.05 mm to 0.8 mm.

[0014] Furthermore, the wall thickness of the "U"-shaped splicing assembly, the first splicing plate and the second splicing plate are all 0.25 mm to 0.35 mm.

[0015] A secondary battery includes a battery shell based on a splicing structure.

[0016] An electric device includes a secondary battery.

[0017] In the utility model, the battery shell is formed by splicing a "U"-shaped splicing assembly, a first splicing plate, and a second splicing plate, and the "U"-shaped splicing assembly is an integrated structure, so that the bottom plate is no longer a separate component, which solves the problem that the bottom plate is easy to fall off after welding. Since the bottom plate does not need to be positioned during the welding process, the steps of milling the step structure and digging grooves on the bottom plate can be removed, and the wall thickness of the bottom plate can be reduced to the same as the side plate, making production simpler. In addition, the first splicing plate and the second splicing plate can share jigs and molds, which greatly improves the production efficiency of the components, reduces the tonnage and number of supporting equipment, and improves the yield and production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 This is an exploded view of an existing battery casing.

[0020] Figure 2 It is a top view of an existing battery casing.

[0021] Figure 3 for Figure 2 AA section view.

[0022] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0023] Figure 5 and Figure 6 It is a structural schematic diagram of an embodiment of a battery casing based on a splicing structure of the utility model.

[0024] Figure 7 for Figure 6 Exploded diagram.

[0025] Figure 8 Schematic diagram of three welds on the first splicing plate.

[0026] Fig. 9 Schematic diagram of the three welds on the second splicing plate.

[0027] Fig.10 FIG. 4 is an exploded view of a battery housing in another embodiment.

[0028] The accompanying drawings in the specification are as follows:

[0029] Shell body - 100; first side panel - 101; second side panel - 102; third side panel - 103; fourth side panel - 104; shell bottom - 110; top opening - 120; "U"-shaped splicing assembly - 200; first side opening - 201; second side opening - 202; first vertical plate - 210; second vertical plate - 220; bottom plate - 230; first splicing plate - 310; first weld - 311; second weld - 312; third weld - 313; second splicing plate - 320; fourth weld - 321; fifth weld - 322; sixth weld - 323; side panel assembly - 910; battery bottom cover - 920; step structure - 921; groove - 922; side weld - 930. DETAILED DESCRIPTION

[0030] The following describes the implementation of the present invention through specific examples. The illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention. The following embodiments and features in the embodiments may be combined with each other without conflict.

[0031] See also Figure 1 and Figure 2 , the four side panels of the side panel assembly 910 of the existing battery shell structure are enclosed to form a rectangular cylindrical structure, so they cannot be obtained by one stamping, and need to be stamped multiple times, which increases the difficulty of the stamping process. Of course, sometimes a large flat plate is first stamped to form the side panel assembly 910 in the unfolded shape, and then a rectangular cylindrical structure is formed by four bends, but this requires transferring the flat plate to the bending equipment for multiple bends after stamping, which will increase the bending process and reduce production efficiency. Moreover, in order to reduce the weight of the battery shell, the wall thickness of the battery shell is generally thin, and the length of the battery shell such as the blade battery is generally 700mm or more; therefore, the flat plate will be arched upward when feeding on the bending equipment, making it difficult to complete smooth feeding. In addition, the mold of the bending equipment generally does not have the bending ability of such large-sized materials, and the bending equipment needs to be modified to increase the size that the mold can be bent, which is quite difficult.

[0032] See also Figure 3 and Figure 4Since the battery housing includes two separate components, the side plate assembly 910 and the battery bottom cover 920, and the side plate assembly 910 is a hollow rectangular cylindrical structure, the battery bottom cover 920 needs to be stably placed at the opening of the rectangular cylindrical structure before welding. Therefore, it is generally necessary to form a step structure 921 by milling on the outer edge of the battery bottom cover 920, so that the battery bottom cover 920 can be positioned by the step structure 921 after being placed at the opening of the housing, so as to avoid displacement of the battery bottom cover 920 during welding; this will also increase the process steps and reduce production efficiency. In addition, the step structure 921 will also greatly increase the wall thickness of the battery bottom cover 920; for example, the wall thickness of the side plate assembly 910 of the battery housing adopting the above structure is generally about 0.3mm, while the wall thickness of the battery bottom cover 920 is generally about 1.1mm, which is much higher than the wall thickness of the side plate assembly 910. Since the external dimensions of the battery housing are generally limited by the product installation space, this will reduce the volume of the internal space of the battery housing and increase the weight of the battery housing. Since blade batteries are generally used in batches, in order to reduce the weight of a single battery casing to the greatest extent, a groove 921 is often dug on the bottom surface of the battery bottom cover 920 to reduce weight. This will also increase the process steps and the weight reduction is extremely limited.

[0033] Since the welds of the battery bottom cover 920 are respectively on the four side panels of the side panel assembly 910, this requires the laser welding head of the spot welding machine to rotate one circle for 360° welding, or the side panel assembly 910 to rotate one circle during the welding process, so as to form a circle of continuous welds on the four side panels of the side panel assembly 910. Therefore, this requires the machine of the spot welding machine to be a 4-axis or 5-axis device to meet the requirements, and the equipment cost is relatively high. Moreover, the welding and fixing of the side weld 930 formed by the side panel assembly 910 after bending and the battery bottom cover 920 cannot generally be completed in one process step, and it is necessary to be divided into two steps for welding separately. In addition, since the battery bottom cover 920 is a separate component, it is easy to fall off after welding. Generally, when welding the battery bottom cover 920, the width of the weld will be increased to ensure the firmness of the battery bottom cover 920 after welding, which will increase the complexity of welding.

[0034] Example 1

[0035] See also Figure 5 and Figure 6 , Figure 5 and Figure 6It is a structural schematic diagram of an embodiment of a battery shell based on a splicing structure of the utility model. A battery shell based on a splicing structure of this embodiment has a shell body 100 and a shell bottom 110. In this embodiment, the battery shell is a rectangular parallelepiped with a top opening 120 on the top. Of course, the battery shell can also be of other shapes. The shell bottom 110 is located directly below the top opening 120; the shell body 100 includes four side panels, namely a first side panel 101, a second side panel 102, a third side panel 103 and a fourth side panel 104; the first side panel 101 and the third side panel 103 are arranged oppositely, and the second side panel 102 and the fourth side panel 104 are arranged oppositely. The width of the first side panel 101 and the third side panel 103 is greater than the width of the second side panel 102 and the fourth side panel 104, so that the two wide side panels of the shell body 100 are formed by the first side panel 101 and the third side panel 103, and the two narrow side panels of the shell body 100 are formed by the second side panel 102 and the fourth side panel 104.

[0036] See also Figure 7 The battery housing includes a "U"-shaped splicing assembly 200 and a first splicing plate 310 and a second splicing plate 320 welded and fixed to the "U"-shaped splicing assembly 200. The "U"-shaped splicing assembly 200 includes a bottom plate 230 and a first vertical plate 210 and a second vertical plate 220 respectively arranged on both sides of the bottom plate 230. The angle between the first vertical plate 210 and the bottom plate 230 and the angle between the second vertical plate 220 and the bottom plate 230 are generally 88° to 92°. In this embodiment, the angle between the first vertical plate 210 and the bottom plate 230 and the angle between the second vertical plate 220 and the bottom plate 230 are both 90°.

[0037] The bottom plate 230, the first vertical plate 210 and the second vertical plate 220 are generally formed in one piece. For example, the "U"-shaped splicing assembly 200 can be made of a flat plate by a stamping process or a bending process. In this embodiment, the "U"-shaped splicing assembly 200 is formed by stamping a stainless steel material; of course, the "U"-shaped splicing assembly 200 can also be formed by stamping an aluminum alloy material.

[0038] After adopting the structure of this embodiment, it is only necessary to punch or bend to form a "U"-shaped "U"-shaped splicing component 200 and to punch to form two flat plate shapes of a first splicing plate 310 and a second splicing plate 320. There is no need to punch or bend to form an enclosed shape component. Therefore, the bending process of the side panel component can be removed or the difficulty of stamping can be reduced, thereby simplifying the manufacturing process of the battery shell.

[0039] The U-shaped splicing assembly 200 is provided with a first side opening 201 on one side and a second side opening 202 on the other side. The first splicing plate 310 is provided at the first side opening 201. The two sides of the first splicing plate 310 are respectively welded and fixed to the first vertical plate 210 and the second vertical plate 220. The bottom side of the first splicing plate 310 is welded and fixed to the bottom plate 230. A first weld 311 is formed by welding at the position where the first splicing plate 310 is connected to the first vertical plate 210, a second weld 312 is formed by welding at the position where the first splicing plate 310 is connected to the second vertical plate 220, and a third weld 313 is formed by welding at the position where the first splicing plate 310 is connected to the bottom plate 230.

[0040] The second splicing plate 320 is disposed at the second side opening 202, and the two sides of the second splicing plate 320 are respectively welded and fixed to the first vertical plate 210 and the second vertical plate 220, and the bottom side of the second splicing plate 320 is welded and fixed to the bottom plate 230. A fourth weld 321 is formed by welding at the position where the second splicing plate 320 is connected to the first vertical plate 210, a fifth weld 322 is formed by welding at the position where the second splicing plate 320 is connected to the second vertical plate 220, and a sixth weld 323 is formed by welding at the position where the second splicing plate 320 is connected to the bottom plate 230.

[0041] During welding, one end of the fixing fixture (not shown in the figure) can extend from the top opening 120 to clamp and fix the "U"-shaped splicing assembly 200, the first splicing plate 310, and the second splicing plate 320. Therefore, there is no need to set a special positioning structure (such as the step structure 921 set on the battery bottom cover 920 in the current technology) on the "U"-shaped splicing assembly 200, the first splicing plate 310, and the second splicing plate 320, so that the "U"-shaped splicing assembly 200, the first splicing plate 310, and the second splicing plate 320 can all use the same thickness. In this embodiment, when the "U"-shaped splicing assembly 200, the first splicing plate 310, and the second splicing plate 320 are made of stainless steel, the wall thickness of the stainless steel material ranges from 0.05mm to 0.8mm. In general, the wall thickness of the "U"-shaped splicing assembly 200, the first splicing plate 310, and the second splicing plate 320 is 0.25mm to 0.35mm, preferably 0.3mm. Of course, the "U"-shaped splicing assembly 200, the first splicing plate 310 and the second splicing plate 320 can also be made of aluminum alloy material. In this case, the wall thickness of the "U"-shaped splicing assembly 200, the first splicing plate 310 and the second splicing plate 320 ranges from 0.2mm to 1.5mm, generally about 0.5mm.

[0042] See also Figure 8 and Fig. 9In order to facilitate welding, in this embodiment, the first weld 311, the second weld 312 and the third weld 313 are all located on the outer side of the first splicing plate 310, and the first weld 311, the second weld 312 and the third weld 313 form a "U"-shaped weld. The fourth weld 321, the fifth weld 322 and the sixth weld 323 are all located on the outer side of the second splicing plate 320, and the fourth weld 321, the fifth weld 322 and the sixth weld 323 form another "U"-shaped weld. In addition, in this embodiment, only two "U"-shaped welds need to be welded, and when welding a "U"-shaped weld, the spot welding machine only needs a 2-axis device, which can also reduce equipment costs and reduce welding difficulty.

[0043] After welding is completed, the first splicing plate 310 and the second splicing plate 320 are spliced ​​with the first vertical plate 210 and the second vertical plate 220 to form the shell body 100. In this embodiment, the first splicing plate 310 and the second splicing plate 320 are symmetrically arranged, the first vertical plate 210 and the second vertical plate 220 are symmetrically arranged, and the width of the first splicing plate 310 and the second splicing plate 320 is greater than the width of the first vertical plate 210 and the second vertical plate 220. Among them, the bottom plate 230 is used to form the shell bottom 110 of the battery shell; the first splicing plate 310 and the second splicing plate 320 are used to form the two wide side plates of the shell body 100 of the battery shell, namely the first side plate 101 and the third side plate 103; the first vertical plate 210 and the second vertical plate 220 are used to form the two narrow side plates of the shell body 100 of the battery shell, namely the second side plate 102 and the fourth side plate 104.

[0044] In this embodiment, the battery shell is formed by splicing a "U"-shaped component (i.e., a "U"-shaped splicing component 200) and two flat plates (i.e., a first splicing plate 310 and a second splicing plate 320), and the bottom plate 230, the first vertical plate 210 and the second vertical plate 220 of the "U"-shaped splicing component 200 are an integrally formed structure, so that the bottom plate 230 is no longer a separate component, which solves the problem that the bottom plate 230 is easy to fall off after welding; since the bottom plate 230 does not need to be positioned during the welding process, the steps of milling the step structure and digging the grooves on the bottom plate 230 can be removed, and the wall thickness of the bottom plate 230 can be thinned to the same as that of the side plate (for example: in this embodiment, the wall thickness of the bottom plate 230 and the four side plates is 0.3 mm), and the volume of the battery shell can be increased under the same external dimensions, and more battery materials can be loaded to increase the capacity of the battery; and the excess weight of the bottom plate 230 is fundamentally removed, reducing the material cost of the battery shell. Although the increased capacity and reduced weight of each battery are limited, for products such as new energy vehicles that require a large number of batteries, the increased battery capacity and reduced weight after accumulation are still very obvious. In addition, this embodiment splits the original stretched parts into bent parts and sheets, and the first splicing plate 310 and the second splicing plate 320 can share a jig and a mold, which greatly improves the production efficiency of the assembly, reduces the tonnage and number of supporting equipment, and improves the yield and production capacity.

[0045] Example 2

[0046] See also Fig.10 , the difference between this embodiment and embodiment 1 is that the widths of the first splicing plate 310, the second splicing plate 320, the first vertical plate 210 and the second vertical plate 220 are different. In this embodiment, the widths of the first vertical plate 210 and the second vertical plate 220 are greater than the widths of the first splicing plate 310 and the second splicing plate 320, so that the first splicing plate 310 and the second splicing plate 320 form two narrow side plates of the shell body 100 of the battery shell, namely the second side plate 102 and the fourth side plate 104; and the first vertical plate 210 and the second vertical plate 220 form two wide side plates of the shell body 100 of the battery shell, namely the first side plate 101 and the third side plate 103. The rest of the structure of this embodiment is the same as that of embodiment 1, and will not be repeated here.

[0047] The utility model also discloses a secondary battery, which can be a power battery or an energy storage battery. For example, the secondary battery can be a blade battery. The housing of the secondary battery is a battery housing based on a splicing structure of any of the above embodiments. Of course, the secondary battery also includes a battery cell accommodated in the battery housing and other structures necessary for conventional secondary batteries, which are all prior art and will not be described in detail here.

[0048] The utility model also discloses an electric device, which includes a secondary battery of any of the above embodiments, so as to supply power to the electric device through the secondary battery. For example, the electric device may be a new energy electric vehicle or a hybrid vehicle. It is understood that the electric device may also be an electric tool, an energy storage device, a power device, or other devices driven by electricity, such as a mobile phone, a tablet computer, a computer, and a drone.

[0049] The above embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A battery casing based on a splicing structure, comprising a casing body and a casing bottom, characterized in that: The battery shell includes a "U"-shaped splicing assembly and a first splicing plate and a second splicing plate welded and fixed to the "U"-shaped splicing assembly. The "U"-shaped splicing assembly includes a bottom plate and a first vertical plate and a second vertical plate respectively arranged on both sides of the bottom plate. The bottom plate forms the bottom of the battery shell, and the first splicing plate and the second splicing plate are spliced ​​with the first vertical plate and the second vertical plate to form the shell body.

2. A battery housing based on a splicing structure as claimed in claim 1, characterized in that: The battery shell is a rectangular parallelepiped with a top opening at the top, and the bottom plate is located directly below the top opening; the shell body includes a first side plate, a second side plate, a third side plate and a fourth side plate, the first side plate and the third side plate are arranged opposite to each other, and the second side plate and the fourth side plate are arranged opposite to each other.

3. A battery casing based on a splicing structure as claimed in claim 2, characterized in that: The bottom plate, the first vertical plate and the second vertical plate are integrally formed.

4. A battery casing based on a splicing structure as claimed in claim 3, characterized in that: The "U"-shaped splicing component is provided with a first side opening on one side and a second side opening on the other side, the first splicing plate is provided at the first side opening, the two side edges of the first splicing plate are respectively welded and fixed to the first vertical plate and the second vertical plate, and the bottom edge of the first splicing plate is welded and fixed to the bottom plate; the first splicing plate is welded to form a first weld at the position where it connects with the first vertical plate, the first splicing plate is welded to form a second weld at the position where it connects with the second vertical plate, and the first splicing plate is welded to form a third weld at the position where it connects with the bottom plate; The second splicing plate is provided with a second side opening, and the two side edges of the second splicing plate are respectively welded and fixed to the first vertical plate and the second vertical plate, and the bottom edge of the second splicing plate is welded and fixed to the bottom plate; the second splicing plate is welded at the position where it connects with the first vertical plate to form a fourth weld, the second splicing plate is welded at the position where it connects with the second vertical plate to form a fifth weld, and the second splicing plate is welded at the position where it connects with the bottom plate to form a sixth weld.

5. A battery casing based on a splicing structure as claimed in claim 4, characterized in that: The first weld, the second weld and the third weld are all located on the outer side of the first splicing plate, and the fourth weld, the fifth weld and the sixth weld are all located on the outer side of the second splicing plate.

6. A battery housing based on a splicing structure as claimed in claim 2, characterized in that: The first splicing plate and the second splicing plate are symmetrically arranged, and the first vertical plate and the second vertical plate are symmetrically arranged; The width of the first splicing plate and the second splicing plate is greater than the width of the first vertical plate and the second vertical plate, or The widths of the first vertical plate and the second vertical plate are greater than the widths of the first splicing plate and the second splicing plate.

7. A battery casing based on a splicing structure according to any one of claims 1 to 6, characterized in that: The "U"-shaped splicing assembly is formed by stamping a stainless steel material, and the wall thickness of the "U"-shaped splicing assembly, the first splicing plate, and the second splicing plate are all 0.05 mm to 0.8 mm.

8. A battery casing based on a splicing structure as claimed in claim 7, characterized in that: The wall thickness of the "U"-shaped splicing assembly, the first splicing plate and the second splicing plate are all 0.25mm to 0.35mm.

9. A secondary battery, characterized in that: It comprises a battery casing based on a splicing structure as described in any one of claims 1 to 8.

10. An electrical equipment, characterized in that: Comprising the secondary battery as claimed in claim 9.

Images