Battery shell and battery

Abstract

The utility model discloses a battery shell and battery, the battery shell is made of metal material, the battery shell comprises a cylinder body and a cover plate, one end of the cylinder body is open, the cylinder body comprises a base plate and an annular side shell part connected with the base plate, the side shell part is formed by connecting a plurality of independent side plates, and in two adjacent side plates, one end of the cylinder body is open, and the other end of the cylinder body is open. One side plate is provided with a coating part attached to the outer side face or the inner side face of the other side plate; and the cover plate is connected with the cylinder body and seals the opening of the cylinder body. According to the battery shell provided by the invention, the coating part enables the thickness of the corner part of the battery shell to be increased, so that the structural strength of the corner part of the battery shell is enhanced, parts in the battery shell can be better protected, and in addition, the coating part can effectively improve the sealing performance and the connection reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery manufacturing technical field especially relates to a battery case and battery. BACKGROUND

[0002] Some battery cases are made of metal material, which has a cylindrical structure (cylinder) to form a space for accommodating components such as battery cells. Currently, battery cases made of metal material are generally formed by stamping to form a cylindrical structure.

[0003] The cylindrical structure of the battery case is usually of equal wall thickness. Since the battery case is relatively thin, its structural strength is relatively weak. For example, for a battery case with corners (such as a rectangular battery case), when the corners are hit, the battery case is prone to deformation or indentation and other adverse phenomena, which is not conducive to ensuring the reliability of the battery.

[0004] During stamping, the battery case may be cracked due to its thinness, resulting in a decrease in yield. In addition, during stamping, a relatively large fillet must be retained to ensure the reliability of the battery case during stamping. The presence of the fillet reduces the capacity of the battery case, which is not conducive to further improving the volumetric energy density of the battery.

[0005] Therefore, it is necessary to improve the prior art to overcome the defects in the prior art. SUMMARY

[0006] The utility model aims at providing a battery case and a battery. The battery case has good structural strength.

[0007] To achieve the above utility model purposes, on one hand, the utility model provides a battery case made of metal material. The battery case comprises:

[0008] A cylinder with one end open, comprising a base plate and a ring-shaped side shell part connected to the base plate. The side shell part is formed by connecting a plurality of independent side plates. Among the two adjacent side plates, one side plate has a cladding part attached to the outer side or inner side of the other side plate.

[0009] A cover plate connected to the cylinder and sealing the opening of the cylinder.

[0010] Further, the side shell part comprises four side plates, namely a first side plate, a second side plate, a third side plate, and a fourth side plate. The first side plate and the second side plate are arranged opposite to each other, and the third side plate and the fourth side plate are arranged opposite to each other.

[0011] The opposite two side plates have a cladding part abutting with the outer side or inner side of the side plate adjacent thereto; or each side plate has a cladding part abutting with the outer side or inner side of the side plate adjacent thereto.

[0012] Further, the side shell part is in a rectangular ring shape.

[0013] Further, the cladding part is abutted on the side plate extending along the length direction of the cylinder.

[0014] Further, the cylinder is formed by bending the integral plate material, the plate material comprising the base plate and the side plates, the recessed mark being formed between the base plate and the side plates, the adjacent two side plates being separated by the cutting groove, and the mark being located inside the battery shell after bending.

[0015] Further, the mark is arranged between the cladding part of the side plate and the rest part of the side plate.

[0016] Further, the length L1 of the cutting groove is greater than the length L2 of the cladding part along the extension direction of the cutting groove.

[0017] Further, the plate material further comprises a cover plate connected with one of the side plates, the mark being arranged between the cover plate and the side plate connected therewith, and the battery shell is formed by bending the plate material.

[0018] Further, the length L2 of the cladding part is 0.5-3mm.

[0019] Further, the base plate and the side plates, the side plates and the cover plate, and the adjacent two side plates are connected through right angle transition.

[0020] Further, the side shell part is provided with a first through hole for mounting a positive electrode part and a second through hole for mounting a liquid blocking plug, the first through hole and the second through hole being arranged on two side plates respectively or on the same side plate.

[0021] On the other hand, the utility model provides a battery comprising the battery shell as described above.

[0022] Compared with the prior art, the battery shell has the following beneficial effects: in the utility model, the battery shell is made of metal material, which comprises a barrel body with one end opening and a cover plate sealing the opening of the barrel body, the barrel body comprises a base plate and a ring-shaped side shell part connected with the base plate, the side shell part is formed by connecting a plurality of independent side plates, among the two adjacent side plates, one side plate has a cladding part adhering to the outer side or the inner side of the other side plate, the cladding part increases the thickness of the corner part of the battery shell, thereby strengthening the structural strength of the corner part of the battery shell, and better protection can be provided for the components inside the battery shell, for example, when the corner part is impacted or extruded, the deformation can be reduced or prevented. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a perspective view of the battery shell of some embodiments of the utility model.

[0024] Figure 2 is a perspective view of the barrel body of some embodiments of the utility model.

[0025] Figure 3 is Figure 2 a top view of the barrel body.

[0026] Figure 4 is a top view of the barrel body of some embodiments of the utility model.

[0027] Figure 5 is a top view of the barrel body of some embodiments of the utility model.

[0028] Figure 6 is a perspective view of the plate material for forming the battery shell shown in Figure 2 .

[0029] Figure 7 is a plan view of the plate material shown in Figure 6 .

[0030] Figure 8 is Figure 7 an enlarged view of the I part in .

[0031] Figure 9 is a perspective view of the plate material for forming the battery shell shown in Figure 1 .

[0032] Figure 10 is a perspective view of the plate material after bending and forming the barrel body shown in Figure 9 .

[0033] Figure 11a is a cross-sectional view of an impression of some embodiments of the present application.

[0034] Figure 11b is a cross-sectional view of an impression of some embodiments of the present application.

[0035] Figure 11c is a cross-sectional view of an impression of some embodiments of the present application.

[0036] Figure 11d is a cross-sectional view of an impression of some embodiments of the present application.

[0037] Figure 12 is an exploded view of a battery housing of some embodiments of the present application. DETAILED DESCRIPTION

[0038] In order to make the above objectives, features and advantages of the present application more apparent, clear and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, and not all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0039] The terms "comprising" and "having" and any variations thereof in the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0040] In this paper, the "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it independent or alternative to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0041] The utility model provides a kind of battery housing, the battery housing is made of metal material, metal material can be alloy material, for example, such as stainless steel material, further optionally, alloy material is stainless steel 316L.

[0042] As Figure 1As shown, the battery case comprises a barrel 1 and a cover plate 2 connected to the barrel 1. The barrel 1 comprises a base plate 10 and a ring-shaped side shell part 11 connected to the base plate 10. It can be understood that the base plate 10 seals one end of the side shell part 11, thus the barrel 1 is open only at one end, and the cover plate 2 seals the opening of the barrel 1, so that a relatively closed space can be formed inside the battery case for accommodating the battery cell, electrolyte and other objects.

[0043] The side shell part 11 is formed by connecting a plurality of independent side plates 110, that is, a plurality of side plates 110 are connected end to end to form a ring-shaped side shell part 11, rather than being integrally formed as one ring-shaped side shell part 11. Among the two adjacent side plates 110, one side plate 110 has a cladding part 1102 abutting the outer side surface 1100 or the inner side surface 1101 of the other side plate 110. For example, Figures 1 to 3 In the embodiment shown, the cladding part 1102 abuts the outer side surface 1100 of the side plate 110, Figure 4 In the embodiment shown, the cladding part 1102 abuts the inner side surface 1101 of the side plate 110.

[0044] Obviously, the cladding part 1102 increases the thickness of the corner 4 of the battery case, thereby strengthening the structural strength of the corner 4 of the battery case, and better protecting the components inside the battery case. For example, when the corner 4 is impacted or extruded, the deformation can be reduced or prevented. In addition, the cladding part 1102 extends from one side plate 110 to another side plate 110, so that the corner 4 is sealed by an integral material, which can effectively improve the sealing performance and the reliability of the connection. For example, if there is no cladding part 1102, the gap between the two adjacent side plates 110 needs to be filled by welding or gluing, which is relatively difficult in process, and the sealing effect is still poor.

[0045] In some embodiments, referring to Figure 3 The side shell part 110 is in the shape of a square ring, which comprises four side plates 110, namely a first side plate 110a, a second side plate 110b, a third side plate 110c and a fourth side plate 110d. The first side plate 110a and the second side plate 110b are oppositely arranged, and the third side plate 110c and the fourth side plate 110d are oppositely arranged.

[0046] As a feasible example, the two opposite side plates 110 have a cladding part 1102 abutting the outer side surface 1100 or the inner side surface 1101 of the side plate 110 adjacent thereto, for example, Figure 3In this battery casing, both the first side plate 110a and the second side plate 110b are provided with a covering portion 1102. Specifically, each of the first side plate 110a and the second side plate 110b has a covering portion 1102 at both ends along the width direction of the battery casing. The two covering portions 1102 of the first side plate 110a are connected to the outer surfaces 1100 of the third side plate 110c and the fourth side plate 110d, respectively, and the two covering portions 1102 of the second side plate 110b are connected to the outer surfaces 1100 of the third side plate 110c and the fourth side plate 110d, respectively. In this way, the battery casing is roughly symmetrical overall.

[0047] As another feasible example, each side panel 110 has a covering portion 1102 that fits against the outer side surface 1100 or inner side surface 1101 of the adjacent side panel 110. Figure 5 As shown, each side plate 110 has a covering part 1102 at one end, and all the covering parts 1102 are spaced apart and respectively located at a corner 4 of the side shell 11 to avoid mutual interference. The covering parts 1102 are all connected to the outer surface 1100 of the adjacent side plate 110.

[0048] Optionally, the covering portion 1102 is attached to the side plate 110 extending along the length direction of the cylinder 1, for example, Figure 3 In the illustrated embodiment, the first side plate 110a and the second side plate 110b extend along the width direction of the cylinder 1, and the third side plate 110c and the fourth side plate 110d extend along the length direction of the cylinder 1. The covering portion 1102 is attached to the third side plate 110c and the fourth side plate 110d. It is understood that the longer the side plate 110 is, the weaker its rigidity and the easier it is to deform. Therefore, by providing the covering portion 1102 attached to it to increase the overall thickness, the strength and rigidity of the side plate 110 can be reliably increased, and its deformation can be reduced or prevented.

[0049] It is understandable that the side shell portion 11 with four side plates 110 does not necessarily have to be rectangular; for example, it can also be trapezoidal.

[0050] Furthermore, the side shell portion 11 may not only include four side plates 110, but may include three or more side plates 110. For example, the side shell portion 11 may include three side plates 110, forming a triangular shape. In embodiments where the side shell portion 11 includes more than four side plates 110, the side shell portion 11 may be pentagonal, hexagonal, or other polygonal shapes.

[0051] In some embodiments, the cylinder 1 is formed by bending a single piece of sheet metal, such as... Figure 6 and Figure 7 As shown, Figure 6 and Figure 7The plate shown in the embodiment has not been folded. The plate comprises a base plate 10 and side plates 110. It can be understood that the number of side plates 110 is consistent with the number of side plates 110 of the cylinder 1 to be formed, Figure 6 and Figure 7 The plate shown is used to form Figure 2 The cylinder 1 shown, therefore, has four side plates 110, and two adjacent side plates 110 are separated by a cut groove 112. It can be understood that the cut groove 112 penetrates the plate along the thickness direction of the plate in order to separate the adjacent side plates 110. Further, in order to facilitate the bending of the side plates 110 and improve the dimensional accuracy of the cylinder 1, a concave mark 111 is formed between the base plate 10 and the side plates 110. In this way, the side plates 110 can be more accurately and easily folded by folding the side plates 110 at the mark 111, ensuring dimensional accuracy, improving production yield, and reducing costs.

[0052] Optionally, the mark 111 is provided between the covering portion 1102 of the side plate 110 and the rest of the side plate 110. For example, Figure 6 and Figure 7 In the embodiment shown, the covering portion 1102 of the first side plate 110a and the second side plate 110b is provided with a mark 111 between the covering portion 1102 and the rest of the side plate 110, so as to facilitate the folding of the covering portion 1102 to be in contact with the third side plate 110c and the fourth side plate 110d.

[0053] After the side plates 110 and the covering portion 1102 are bent, the side plates 110 and the covering portion 1102 can be connected by welding or bonding to form a firm cylinder 1. Welding or bonding can also be supplemented between the corner of the base plate 10 and the side plate 110 at that location to improve the sealing of the cylinder 1 at the tip 1a.

[0054] Optionally, the length L1 of the cut groove 112 is greater than the length L2 of the covering portion 1102 along the extension direction of the cut groove 112, which can reduce the interference of the material of the cylinder 1 at the tip 1a, to further improve the dimensional accuracy of the cylinder 1 after bending.

[0055] Optionally, the length L2 of the covering portion 1102 is 0.5-3mm, so that the covering portion 1102 has a suitable length to reliably increase the strength of the side plate 110 connected thereto. Further optionally, the length L2 is 1-3mm, and more further optionally, the length L2 is 2-3mm.

[0056] In some embodiments, reference is made to Figure 9The plate further comprises a cover plate 2 connected to one of the side plates 110, so that the battery case can be formed by bending the plate, without the need to connect a separate cover plate 2 after the cylinder 1 is formed by bending, reducing the requirement for the positioning accuracy of the cylinder 1 when connecting the cover plate 2. It can be understood that, since the wall thickness of the cylinder 1 is thin, a high-precision positioning tool is required for positioning when connecting the separate cover plate 2 to the cylinder 1. By folding the cover plate 2, the requirement for positioning accuracy can be reduced, since the side of the cover plate 2 connected to the cylinder 1 has been accurately positioned.

[0057] Optionally, with reference to Figure 9 The cover plate 2 and the side plate 110 connected thereto are provided with a mark 111, so as to facilitate folding of the cover plate 2 and improve the positioning accuracy of the folded cover plate 2. In actual production, the cylinder 1 can be formed by bending first, and the cover plate 2 can be folded to contact the opening end of the cylinder 1 after the components inside the battery case are installed, and the cover plate 2 and the cylinder 1 can be connected and fixed by welding or bonding in subsequent processes to form a seal. Figure 10

[0058] Optionally, all the marks 111 are located on the same surface of the plate, and after being bent, the marks 111 are located inside the battery case, which is beneficial to improving the strength of the battery case at the marks 111, preventing the marks 111 from being exposed and making the battery case easy to tear, and is beneficial to ensuring the appearance of the battery case.

[0059] It can be understood that the cross-sectional shape of the mark 111 is not limited, for example, Figure 11a In the embodiment shown, the cross-sectional shape of the mark 111 is triangular. Figure 11b In the embodiment shown, the cross-sectional shape of the mark 111 is rectangular. Figure 11c In the embodiment shown, the cross-sectional shape of the mark 111 is trapezoidal, and the width of the opening of the mark 111 is larger. Figure 11d In the embodiment shown, the cross-sectional shape of the mark 111 includes two symmetrically arranged arc lines 1110. The provision of the mark 111 makes the thickness of the connecting part between the plates on both sides of the mark 111 thinner, so that it is easier to bend and form an angle change at this part.

[0060] It can be understood that, when being folded, the side plate 110 is folded to be 90° with the base plate 10, and after being bent, the side plate 110 and the base plate 10, the side plate 110 and the cover plate 2, and the adjacent two side plates 110 are basically perpendicular, which is achieved by a right-angle transition rather than a round-angle transition, so as to increase the space inside the battery case and improve the energy density of the battery.

[0061] As shown in Figure 12 ​As shown, the side shell part 11 is provided with a first through hole 1103 for mounting the positive pole 30 and a second through hole 1104 for mounting the liquid blocking plug 31. In some embodiments, the first through hole 1103 and the second through hole 1104 are respectively arranged on the two side plates 110. In other embodiments, the first through hole 1103 and the second through hole 1104 are both arranged on the same side plate 110. Figure 12 In some embodiments, both the first through hole 1103 and the second through hole 1104 are arranged on the second side plate 110b.

[0062] Since the barrel 1 is formed by bending the plate, the plate is in a plate shape before bending, so it is more convenient to process the first through hole 1103 and the second through hole 1104 on the plate, and it is also more convenient to mount the positive pole 30 and the liquid blocking plug 31, which is conducive to improving the processing efficiency and reducing the cost. Therefore, optionally, the through hole, the positive pole 30 and the liquid blocking plug 31 are all processed and mounted before the plate is bent.

[0063] It can be understood that the positive pole 30 is made of conductive material, for example, metal material such as aluminum. The positive pole 30 and the battery shell are connected by an insulating material, so that they are insulated from each other, Figure 12 In the embodiment shown, the positive pole 30 and the battery shell are separated by an insulating sheet 34, and the positive pole 30 and the battery shell are connected by hot melting the insulating sheet 34. The positive pole 30 partially extends into the battery shell through the first through hole 1103, which is used to connect one of the pole tabs of the battery cell, and the battery shell is connected to the other pole tab of the battery cell, that is, the positive pole 30 and the battery shell can be used as the positive pole and the negative pole of the battery respectively. Optionally, the outer surface of the battery shell is also provided with a negative pole sheet 32, which is made of metal material such as nickel. Using the negative pole sheet 32 as the negative pole of the battery makes it easier to connect to the external power device. Optionally, the negative pole sheet 32 and the positive pole 30 are arranged on the same side plate 110.

[0064] The second through hole 1104 can be filled with electrolyte, and the liquid blocking plug 31 is used to block the second through hole 1104. The liquid blocking plug 31 and the battery shell can be connected by bonding or welding. Figure 12 In the embodiment shown, the liquid blocking plug 31 and the battery shell are also connected by hot melting the insulating sheet 34.

[0065] The utility model also provides a battery, which comprises the battery shell described above, and the battery further comprises a battery cell arranged in the battery shell.

[0066] The above is only a specific implementation manner of the utility model, and any improvement made on the basis of the utility model concept is regarded as the protection range of the utility model.

Claims

1. A battery casing, characterized in that, It is made of metal material, and the battery casing includes: A cylindrical body (1) with one end open includes a base plate (10) and an annular side shell (11) connected to the base plate (10). The side shell (11) is formed by connecting a plurality of independent side plates (110). In two adjacent side plates (110), one side plate (110) has a covering part (1102) that fits against the outer side surface (1100) or inner side surface (1101) of the other side plate (110). The cover plate (2) is connected to the cylinder (1) and seals the opening of the cylinder (1).

2. The battery casing as described in claim 1, characterized in that, The side shell portion (11) includes four side plates (110), namely a first side plate (110a), a second side plate (110b), a third side plate (110c), and a fourth side plate (110d). The first side plate (110a) and the second side plate (110b) are arranged opposite to each other, and the third side plate (110c) and the fourth side plate (110d) are arranged opposite to each other. Two opposing side plates (110) have a covering portion (1102) that fits against the outer side surface (1100) or inner side surface (1101) of the adjacent side plate (110); or, each side plate (110) has a covering portion (1102) that fits against the outer side surface (1100) or inner side surface (1101) of the adjacent side plate (110).

3. The battery casing as described in claim 1, characterized in that, The side shell (11) is rectangular.

4. The battery casing as described in claim 3, characterized in that, The covering part (1102) is attached to the side plate (110) extending along the length direction of the cylinder (1).

5. The battery casing as described in claim 1, characterized in that, The cylindrical body (1) is formed by bending an integral sheet material, the sheet material including the base plate (10) and the side plate (110), a recessed imprint (111) is formed between the base plate (10) and the side plate (110), and two adjacent side plates (110) are separated by a groove (112). After bending, the imprint (111) is located inside the battery casing.

6. The battery casing as described in claim 5, characterized in that, An imprint (111) is provided between the covering portion (1102) of the side plate (110) and the rest of the side plate (110).

7. The battery casing as described in claim 5, characterized in that, The length L1 of the groove (112) is greater than the length L2 of the covering portion (1102) along the extension direction of the groove (112).

8. The battery casing as described in claim 5, characterized in that, The sheet material also includes a cover plate (2) connected to one of the side plates (110), and an imprint (111) is provided between the cover plate (2) and the side plate (110) connected thereto. The battery casing is formed by bending the sheet material.

9. The battery casing as described in claim 1, characterized in that, The length L2 of the covering part (1102) is 0.5 to 3 mm.

10. The battery casing as claimed in claim 1, characterized in that, The substrate (10) and the side plate (110), the side plate (110) and the cover plate (2), and two adjacent side plates (110) are connected by right angles.

11. The battery casing as claimed in any one of claims 1 to 10, characterized in that, The side shell (11) is provided with a first through hole (1103) for installing the positive electrode (30) and a second through hole (1104) for installing the liquid plug (31). The first through hole (1103) and the second through hole (1104) are respectively provided on two side plates (110) or on the same side plate (110).

12. A battery, characterized in that, Includes the battery casing as described in any one of claims 1 to 11.

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