Battery steel shell structure and battery applying same

Abstract

The utility model discloses a battery steel shell structure and a battery applying the same. The battery steel shell structure comprises a steel sheet formed by punching, the steel sheet comprises a first main body and a second main body which are integrated, a first punching pit is formed in the first main body by punching, and the second main body is opposite to the first punching pit to form a battery cell cavity for accommodating a battery cell. Therefore, on one hand, the production requirements of relatively high height and relatively small wall thickness are easily met, the forming difficulty is relatively low, and the effective volume of the battery cell cavity is favorably increased, so that the volumetric specific capacity of the battery is favorably improved; on the other hand, the stress in the forming process of the battery steel shell structure is small, heat treatment is not needed, and the outer surface smoothness is high; more importantly, the first punching pit is formed in the first main body, the battery cell cavity can be formed only through one-time edge folding, compared with edge folding on the two sides, the shape of the battery steel shell structure can meet the production standard more easily, production is easy, and the production yield of the battery steel shell structure can be improved easily.

Description

Technical Field

[0001] The utility model relates to the technical field of steel shell batteries, in particular to a battery steel shell structure and a battery using the same. Background Art

[0002] In the existing production of battery hard shells, the raw materials can be directly stretched into shells, and then caps are welded on both sides of the shell in the height direction to form the steel shell structure of the battery. This production method is relatively easy, but this production method requires the raw materials to have a thicker thickness. When the battery requires a higher height and a thinner wall thickness, the steel shell structure is very difficult to form. In addition, after the shell is stretched to a certain height, in order to eliminate stress, it is often necessary to anneal it before subsequent stretching, which has a great impact on the outer surface finish of the steel shell structure.

[0003] In order to solve the above problems, in the prior art, the raw materials can be first punched into steel sheets, and then the steel sheets are bent into a shell, and then caps are welded on both sides of the shell in the height direction to form a steel shell structure of the battery. This production method can make the steel shell structure easier to form when the battery requires a higher height and a thinner wall thickness. However, since it is necessary to fold the edges of the steel sheet separately on both sides during bending, the accuracy requirements for the two foldings are particularly high. Once the folding heights on both sides of the steel sheet are uneven, the shape of the shell is likely to fail to meet the production standards. Utility Model Content

[0004] In order to overcome at least one of the defects described in the above-mentioned prior art, the utility model provides a battery steel shell structure and a battery using the same, aiming to make the forming of the steel shell structure easier when the battery requires a higher height and a thinner wall thickness, and to make the shape of the shell easier to meet production standards and improve production yield.

[0005] The technical solution adopted by the utility model to solve the problem is:

[0006] The battery steel shell structure includes: a stamped steel sheet, the steel sheet includes an integrated first main body and a second main body, the first main body is stamped with a first punching hole, and the second main body is arranged opposite to the first punching hole to form a battery cell cavity for accommodating a battery cell.

[0007] According to some embodiments of the utility model, the first punching pit is formed with a side surface extending along the depth direction of the first punching pit, and the side surface is provided with a pole hole.

[0008] According to some embodiments of the utility model, the first punching pit is formed with a side surface extending along the depth direction of the first punching pit, and the side surface is provided with a liquid injection hole.

[0009] According to some embodiments of the present invention, the second body is formed with a second punching pit, and the first punching pit and the second punching pit are opposite to each other and form the battery cell cavity.

[0010] According to some embodiments of the present invention, the second body is in a sheet shape, and the side of the second body is welded to the first punching hole.

[0011] According to some embodiments of the present invention, the depth of the first punching pit is between 4 mm and 6 mm.

[0012] According to some embodiments of the present invention, the length of the first punching hole is between 15-65 mm, and the width of the first punching hole is between 15-65 mm.

[0013] According to some embodiments of the present invention, the thickness of the steel sheet is between 0.1 mm and 0.3 mm.

[0014] According to some embodiments of the present invention, the steel sheet is stainless steel.

[0015] In addition, the utility model also provides a battery, including the battery steel shell structure as described above, and also including a battery core, wherein the battery core is arranged in the battery core cavity.

[0016] In summary, the battery steel shell structure and the battery using the same provided by the utility model have at least the following technical effects:

[0017] On the one hand, it can easily meet the production requirements of higher height and smaller wall thickness, and has lower molding difficulty, which is beneficial to increasing the effective volume of the battery cell cavity, thereby helping to improve the volumetric capacity of the battery; on the other hand, the battery steel shell structure has less stress during the molding process, does not require heat treatment, and has a high outer surface finish; more importantly, by forming the first punching pit in the first main body, the battery cell cavity can be formed with only one folding. Compared with folding on both sides, the shape of the battery steel shell structure is easier to meet production standards, and production is also easier, which is beneficial to improving the production yield of the battery steel shell structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a battery steel shell structure in an expanded state according to an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the battery steel shell structure in the unfolded state according to an embodiment of the utility model;

[0020] Figure 3 It is a schematic structural diagram of a battery according to an embodiment of the utility model.

[0021] The meanings of the reference numerals are as follows:

[0022] 1-steel sheet, 11-first main body, 111-first punching hole, 112-side, 113-pole hole, 114-liquid injection hole, 12-second main body, 2-connecting head, 3-sealing head. DETAILED DESCRIPTION

[0023] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0027] See also Figure 1 and Figure 2 The utility model discloses a battery steel shell structure, including a stamped steel sheet 1, wherein the steel sheet 1 includes an integrated first main body 11 and a second main body 12, wherein a first punching hole 111 is stamped on the first main body 11, and the second main body 12 is arranged opposite to the first punching hole 111 to form a battery cell cavity for accommodating a battery cell.

[0028] Thus, the battery steel shell structure formed by stamping disclosed in the embodiment of the utility model, on the one hand, can easily meet the production requirements of higher height and smaller wall thickness, and has lower molding difficulty, which is beneficial to increase the effective volume of the battery cell cavity, thereby facilitating improving the volumetric capacity of the battery; on the other hand, the battery steel shell structure has less stress during the molding process, does not require heat treatment, and has a high outer surface finish; more importantly, by forming the first punching pit 111 in the first main body 11, the battery cell cavity can be formed by only one folding, and compared with folding on both sides, the shape of the battery steel shell structure is easier to meet the production standards, and production is also easier, which is beneficial to improving the production yield of the battery steel shell structure.

[0029] It is understandable that when the battery is discharging, gas will be generated. The center line of the battery in the thickness direction is subject to greater gas pressure. The weld of the existing battery is usually located at the center line of the battery in the thickness direction. Once the gas production is too large, the weld is likely to crack, which is easy to affect the safety and reliability of the battery. In order to solve the above problems, it is better to Figure 1 and Figure 2 As shown, in the embodiment of the utility model, the second main body 12 is in sheet shape, and the side of the second main body 12 is welded to the first punching pit 111. In this way, the weld of the battery steel shell structure is on one side in the thickness direction of the battery, where the gas production is small and the gas pressure is also low. In this way, by shifting the weld position, it is beneficial to improve the safety and reliability of the battery.

[0030] It should be noted that, in some other utility model embodiments, the second body 12 may also be formed with a second punched pit, and the first punched pit 111 and the second punched pit are opposite to each other and form the battery cell cavity, which can be selected according to actual needs.

[0031] It is understandable that the existing battery shell also needs to be welded with caps on both sides in the height direction to provide the battery sealing function and the role of a safety valve. However, in this way, the shell needs at least three weldings, and the probability of welding leakage and welding explosion is high, which affects the final qualified rate of the product. In order to solve the above problems, it is better to Figure 1 and Figure 3 As shown, in the embodiment of the utility model, the first punching pit 111 is formed with a side surface 112 extending along its own depth direction, and the side surface 112 is provided with a pole hole 113 and a liquid injection hole 114. Specifically, the side surface 112 is located on both sides of the battery steel shell structure in the height direction. With such a configuration, the side surface 112 is equivalent to a cap, which can provide a battery sealing function and also can provide a safety valve function. More importantly, there is no need to weld a cap separately, and the overall welding times of the battery steel shell structure are reduced, which is beneficial to improving the final qualified rate of the product.

[0032] like Figure 3 As shown, more specifically, in the embodiment of the utility model, an insulating connector 2 is injection-molded at the pole hole 113 , and a sealing head 3 is provided at the injection hole 114 .

[0033] Preferably, in the embodiment of the utility model, the thickness of the steel sheet 1 is between 0.1 mm and 0.3 mm, so that the steel sheet 1 has a certain strength and is relatively easy to shape. It should be noted that in some other utility model embodiments, the thickness of the steel sheet 1 can also be less than 0.1 mm or greater than 0.3 mm, which can be selected according to actual needs.

[0034] Preferably, in the embodiment of the utility model, the steel sheet 1 is stainless steel. With such a configuration, firstly, stainless steel has excellent corrosion resistance, which can effectively prevent the reaction between the internal battery and moisture, water and other chemicals in the external environment, thereby extending the service life of the battery; secondly, the stainless steel shell can also provide good mechanical protection to prevent the battery from being subjected to external impact or pressure during use; in addition, the stainless steel material itself has high strength and hardness, which can provide sufficient strength support while ensuring the compact structure of the battery; finally, stainless steel also has relatively high thermal conductivity, which helps to dissipate heat and maintain a stable temperature of the battery during operation. It should be noted that in some other utility model embodiments, the steel sheet 1 can also be, but is not limited to, carbon steel, which is not the only limitation here.

[0035] Specifically, in the embodiment of the utility model, the depth of the first punching hole 111 is between 4 mm and 6 mm, the length of the first punching hole 111 is between 15 mm and 65 mm, and the width of the first punching hole 111 is between 15 mm and 65 mm, which meets the specifications of batteries of general watches and mobile phones. It should be noted that in some other utility model embodiments, the depth of the first punching hole 111 can also be less than 4 mm or greater than 6 mm, which can be selected according to actual needs.

[0036] In addition, if Figure 3 As shown, this embodiment also provides a battery, including the battery steel shell structure as described above, and also including a battery cell, and the battery cell is arranged in the battery cell cavity.

[0037] In summary, the battery steel shell structure and the battery using the same disclosed in the utility model can at least bring the following beneficial technical effects:

[0038] 1) It is easy to meet the production requirements of higher height and smaller wall thickness, and the molding difficulty is relatively low, which is conducive to increasing the effective volume of the battery cavity, thereby helping to improve the volumetric capacity of the battery;

[0039] 2) By forming a punching hole in the first body 11, the battery cell cavity can be formed by folding the edge once. Compared with folding the edges on both sides, the shape of the battery steel shell structure is easier to meet the production standards, and the production is also easier, which is conducive to improving the production yield of the battery steel shell structure;

[0040] 3) The weld of the battery steel shell structure is on one side of the battery thickness direction, where the gas production is small and the gas pressure is also low. In this way, by shifting the weld position, it is beneficial to improve the safety and reliability of the battery;

[0041] 4) The side 112 is equivalent to a cap, which can provide a battery sealing function and also serve as a safety valve. There is no need to weld a cap separately, and the overall welding times of the battery steel shell structure are reduced, which is beneficial to improving the final qualified rate of the product.

[0042] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. Battery steel shell structure, characterized in that: include: A stamped steel sheet (1), the steel sheet (1) comprising an integrated first body (11) and a second body (12), the first body (11) having a first punch hole (111) stamped thereon, the second body (12) being arranged opposite to the first punch hole (111) to form a cell cavity for accommodating a cell.

2. The battery steel shell structure according to claim 1, characterized in that: The first punching hole (111) is formed with a side surface (112) extending along the depth direction of the first punching hole, and the side surface (112) is provided with a pole hole (113).

3. The battery steel shell structure according to claim 1, characterized in that: The first punching hole (111) is formed with a side surface (112) extending along the depth direction of the first punching hole, and the side surface (112) is provided with a liquid injection hole (114).

4. The battery steel shell structure according to claim 1, characterized in that: The second body (12) is formed with a second punched hole, and the first punched hole (111) and the second punched hole are opposite to each other and form the battery cell cavity.

5. The battery steel shell structure according to claim 1, characterized in that: The second main body (12) is in a sheet shape, and the side edge of the second main body (12) is welded to the first punching hole (111).

6. The battery steel shell structure according to claim 5, characterized in that: The depth of the first punching hole (111) is between 4 mm and 6 mm.

7. The battery steel shell structure according to claim 1, characterized in that: The length of the first punching hole (111) is between 15-65 mm, and the width of the first punching hole (111) is between 15-65 mm.

8. The battery steel shell structure according to any one of claims 1 to 7, characterized in that: The thickness of the steel sheet (1) is between 0.1 mm and 0.3 mm.

9. The battery steel shell structure according to any one of claims 1 to 7, characterized in that: The steel sheet (1) is made of stainless steel.

10. A battery, characterized in that It comprises a battery steel shell structure as described in any one of claims 1 to 9, and also comprises a battery cell, wherein the battery cell is arranged in the battery cell cavity.

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