Sectional battery metal shell and battery using same

Abstract

The utility model relates to a sectional type battery metal shell and a battery using the same, and belongs to the field of batteries, the sectional type battery metal shell comprises a shell body, the shell body is formed by splicing a first shell monomer and a second shell monomer which are arranged up and down, the first shell monomer is in a cylindrical shape with an opening at the lower end, and the second shell monomer is in a cylindrical shape with an opening at the upper end; the axes of the second shell single body and the first shell single body are located on the same vertical straight line, and the outer diameter and the inner diameter of the second shell single body are the same as those of the first shell single body. The upper end of the second shell single body is fixedly connected with the lower end of the first shell single body through an annular aluminum plastic film belt, and the aluminum plastic film belt is arranged at the lower end of the first shell single body and the upper end of the second shell single body in a sleeving mode at the same time and fixedly connected with the first shell single body and the second shell single body in a mutually sealed mode. The production quality of the battery shell can be effectively improved, and the production cost of the shell body can be effectively reduced. Besides, the battery using the battery metal shell disclosed by the utility model does not need to be additionally provided with an anti-explosion valve structure, so that the production cost of the battery can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, especially a kind of segmented battery metal shell and the battery using it. BACKGROUND

[0002] Cylindrical battery refers to the battery with cylindrical shape, commonly used in lithium battery, sodium battery and various battery types. This kind of battery is widely used because of its simple structure, small size and easy mass production.

[0003] The shell of cylindrical lithium battery is usually made of metal, such as steel and aluminum, which mainly functions to protect the components inside the battery and provide a sealed environment for the battery. Currently, the production of battery shell is usually completed using a drawing process, in which the greater the drawing depth, the more difficult it is to ensure the quality of the drawn part, for example: 1. If the drawing pressure is not properly controlled when the drawing depth increases, wrinkles may occur on the sheet, especially at greater depths, which is more prominent; 2. As the depth increases, the thickness of the metal gradually decreases, especially in the bottom area. If the uniformity during the drawing process is not sufficient, the bottom may become too thin, or even perforated; 3. As the depth increases, the cold work hardening effect of the metal material may become more pronounced, which reduces the plasticity of the material and makes subsequent forming more difficult, increasing the risk of rupture during the drawing process.

[0004] Therefore, the utility model provides a segmented battery metal shell and the battery using it, by setting the battery shell as a segmented split structure, which can greatly reduce the drawing depth required during the shell production process, thereby reducing the probability of quality problems occurring during the production of the battery shell, ensuring the quality of the battery shell. At the same time, due to the reduced production difficulty of the battery shell, the production cost of the battery shell can also be effectively reduced. SUMMARY

[0005] Therefore, it is necessary to provide a segmented battery metal shell, which includes a shell body made up of a first shell monomer and a second shell monomer arranged vertically, the first shell monomer is in the form of a cylinder with an open lower end, the second shell monomer is in the form of a cylinder with an open upper end, the axis of the second shell monomer and the first shell monomer is located on the same vertical line, and the outer diameter and inner diameter of the second shell monomer and the first shell monomer are the same; the upper end of the second shell monomer is fixedly connected to the lower end of the first shell monomer through an annular aluminum plastic film strip, the aluminum plastic film strip is simultaneously sleeved on the lower end of the first shell monomer and the upper end of the second shell monomer, and is fixedly connected to the first shell monomer and the second shell monomer in a mutually sealed manner.

[0006] The utility model discloses a battery metal shell for cylindrical lithium battery and cylindrical sodium battery, wherein, first shell monomer and second shell monomer are metal material, preferably steel or aluminium, which are fixedly connected with each other and mutually sealed through aluminium plastic film belt, and the split obtains the shell body of the cylinder shape of two end sealing, the cavity structure formed in the shell body is used to accommodate the battery core, and the two ends are used to install the positive pole structure and negative pole structure communicated with the battery core, so that the battery core is communicated to the outside of battery metal shell.

[0007] In the utility model, the shell body is split by first shell monomer and second shell monomer, wherein, first shell monomer and second shell monomer have lower height relative to the shell body, therefore, first shell monomer and second shell monomer are processed by drawing process respectively, and then first shell monomer and second shell monomer are split into the shell body, compared with directly drawing the shell body, the drawing depth required by drawing process can be greatly reduced, so that the probability of quality problem of the shell body in the drawing production process can be reduced, and the quality of the shell body is ensured, and at the same time, because the production difficulty of the shell body is reduced, the probability of defective product can be effectively reduced, that is, the production cost of the shell body can be effectively reduced.

[0008] In addition, in the utility model, first shell monomer and second shell monomer are fixedly connected with each other through the aluminium plastic film belt sleeved thereon, because of the characteristics of aluminium plastic film material, when the pressure in the shell body increases suddenly, the aluminium plastic film belt can play the role of explosion-proof valve through its rupture, therefore, the battery using the battery metal shell of the utility model does not need to additionally set the explosion-proof valve structure, and the production cost can be effectively reduced.

[0009] Further, the first shell monomer and the second shell monomer have a gap therebetween.

[0010] In the utility model, there is a gap between first shell monomer and second shell monomer, therefore, the aluminium plastic film belt located at the gap is not supported and protected by first shell monomer and second shell monomer, when the pressure in the shell body increases suddenly, the aluminium plastic film belt can rupture in time, and better explosion-proof effect can be achieved.

[0011] In addition, the gap between first shell monomer and second shell monomer can also insulate first shell monomer and second shell monomer from each other, and the short circuit risk of the battery using the metal shell of the utility model can be effectively reduced.

[0012] Further, the region covered by the aluminium plastic film belt on the first shell monomer and the second shell monomer forms an adhesion area, the adhesion area is provided with a polypropylene layer, the aluminium plastic film belt is adhered to the first shell monomer and the second shell monomer through the polypropylene layer, and the first shell monomer and the second shell monomer are fixedly and sealingly matched with each other.

[0013] The polypropylene layer arranged on the first shell monomer and the second shell monomer is located between the aluminum plastic film belt and the first shell monomer and the second shell monomer, and is used for realizing fixed connection between the aluminum plastic film belt and the first shell monomer and the second shell monomer, wherein the polypropylene layer is fused on the first shell monomer and the second shell monomer by using high-frequency hot pressing or physical hot pressing, and the aluminum plastic film belt is fused on the polypropylene layer by hot pressing.

[0014] Further, the surface roughness of the adhesion area on the first shell monomer and the second shell monomer is greater than the surface roughness of other areas on the first shell monomer and the second shell monomer.

[0015] In the utility model, the adhesion area on the first shell monomer and the second shell monomer can be obtained by chemical medicine corrosion and the like, and by increasing the surface roughness of the adhesion area, the strength of the fusion structure of the polypropylene layer and the first shell monomer and the second shell monomer can be effectively increased.

[0016] Further, the thickness of the polypropylene layer is 0.03-1mm.

[0017] Further, the top end of the first shell monomer and the bottom end of the second shell monomer are provided with circular mounting holes, the circular mounting holes are coaxial with the shell body, and a lead-through assembly in sealing cooperation with the mounting holes is mounted at the mounting holes.

[0018] In the utility model, a cavity structure is formed in the shell body, and the cavity structure is used for mounting the electric core; the mounting holes provided at the end portions of the first shell monomer and the second shell monomer are used for mounting the lead-through assembly; and the lead-through assembly is used for leading through the positive plate and the negative plate of the electric core accommodated in the cavity structure, so as to lead the electric core to the outside of the shell body and serve as the positive and negative poles of the battery. The electric core and the lead-through assembly can be the electric core and the lead-through assembly of the prior art.

[0019] On the other hand, the utility model also provides a battery which uses the battery metal shell as its shell.

[0020] Further, the battery comprises a cylindrical electric core which is wound by a positive plate, a diaphragm and a negative plate which are sequentially stacked; the electric core is embedded in the shell body, and the outer diameter of the electric core is the same as the inner diameter of the first shell monomer and the second shell monomer.

[0021] The outer diameter of the battery cell is same as the inner diameter of the first shell monomer and the second shell monomer, so that after the battery cell is embedded into the shell body, the battery cell can support and fix the first shell monomer and the second shell monomer, and the relative bending of the first shell monomer and the second shell monomer in the use process of the shell body can be effectively avoided, that is, the relatively soft aluminum plastic film belt can be protected, and the aluminum plastic film belt is prevented from being pulled.

[0022] The principle and effect of the utility model will be further explained in combination with the above technical scheme and the drawings:

[0023] In the utility model, the shell body is spliced by the first shell monomer and the second shell monomer, wherein the first shell monomer and the second shell monomer have a lower height relative to the shell body, so that the first shell monomer and the second shell monomer are respectively machined by using a drawing process, and then the first shell monomer and the second shell monomer are spliced into the shell body, which can greatly reduce the drawing depth required by the drawing process relative to directly drawing the shell body, thereby reducing the probability of quality problems of the shell body in the drawing production process, ensuring the quality of the shell body, and simultaneously, since the production difficulty of the shell body is reduced, the probability of defective products can be effectively reduced, that is, the production cost of the shell body can be effectively reduced.

[0024] In addition, in the utility model, the first shell monomer and the second shell monomer are fixedly connected with each other through the aluminum plastic film belt sleeved thereon, and due to the characteristics of the aluminum plastic film material, when the pressure in the shell body suddenly increases, the aluminum plastic film belt can play the role of an explosion-proof valve through its rupture, so that the battery using the battery metal shell of the utility model does not need to additionally set an explosion-proof valve structure, and the production cost thereof can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a sectional type battery metal shell structure schematic view described in the utility model embodiment;

[0026] Figure 2 It is a first shell monomer structure schematic view described in the utility model embodiment;

[0027] Figure 3 It is a second shell monomer structure schematic view described in the utility model embodiment;

[0028] Figure 4 It is a first shell monomer and second shell monomer and battery cell cooperation structure schematic view described in the utility model embodiment;

[0029] Figure 5 It is Figure 4 Partial enlarged view.

[0030] REFERENCE NUMERALS

[0031] 11-first shell monomer, 12-second shell monomer, 13-adhesion area, 14-conducting assembly, 2-polypropylene layer, 3-aluminum plastic film belt, 4-electric core. DETAILED DESCRIPTION

[0032] In order to facilitate those skilled in the art to understand, the utility model will be described in further detail below in combination with the drawings and examples:

[0033] As Figures 1-5 A segmented battery metal shell, for directly drawing the shell body, can greatly reduce the drawing depth required by the drawing process, thereby reducing the probability of quality problems in the drawing production process of the shell body, ensuring the quality of the shell body, and at the same time, due to the reduced production difficulty of the shell body, the probability of defective products can be effectively reduced, that is, the production cost of the shell body can be effectively reduced.

[0034] In addition, in the utility model, the first shell monomer 11 and the second shell monomer 12 are fixedly connected with each other through the aluminum plastic film belt 3 sleeved thereon. Due to the characteristics of the aluminum plastic film material, when the pressure in the shell body increases suddenly, the aluminum plastic film belt 3 can play the role of an explosion-proof valve by breaking, so that the battery using the battery metal shell of the utility model does not need to additionally set an explosion-proof valve structure, and the production cost can be effectively reduced.

[0035] In one embodiment, the first shell monomer 11 and the second shell monomer 12 have a gap therebetween.

[0036] In this embodiment, there is a gap between the first shell monomer 11 and the second shell monomer 12, so that the aluminum plastic film belt 3 located at the gap is not supported and protected by the first shell monomer 11 and the second shell monomer 12. When the pressure in the shell body increases suddenly, the aluminum plastic film belt 3 can break in time, and has a better explosion-proof effect.

[0037] In addition, by setting the gap between the first shell monomer 11 and the second shell monomer 12, the first shell monomer 11 and the second shell monomer 12 can be insulated from each other, and the short circuit risk of the battery using the metal shell of the utility model can be effectively reduced.

[0038] In one embodiment, the area covered by the aluminum plastic film belt 3 of the first shell monomer 11 and the second shell monomer 12 forms an adhesion area 13, the adhesion area 13 is provided with a polypropylene layer 2, the aluminum plastic film belt 3 is adhered to the first shell monomer 11 and the second shell monomer 12 through the polypropylene layer 2, and is in sealed cooperation with the first shell monomer 11 and the second shell monomer 12.

[0039] In the embodiment, the polypropylene layer 2 arranged on the first shell monomer 11 and the second shell monomer 12 is located between the aluminum-plastic film strip 3 and the first shell monomer 11 and the second shell monomer 12, and is used for realizing fixed connection between the aluminum-plastic film strip 3 and the first shell monomer 11 and the second shell monomer 12, wherein the polypropylene layer 2 is fused on the first shell monomer 11 and the second shell monomer 12 by using high-frequency hot pressing or physical hot pressing, and the aluminum-plastic film strip 3 is fused on the polypropylene layer 2 by hot pressing.

[0040] In one embodiment, the surface roughness of the adhesion area 13 on the first shell monomer 11 and the second shell monomer 12 is greater than the surface roughness of other areas on the first shell monomer 11 and the second shell monomer 12.

[0041] In the embodiment, the adhesion area 13 on the first shell monomer 11 and the second shell monomer 12 can be obtained by chemical etching or the like, and by increasing the surface roughness of the adhesion area 13, the strength of the fusion structure of the polypropylene layer 2 and the first shell monomer 11 and the second shell monomer 12 can be effectively increased.

[0042] In one embodiment, the thickness of the polypropylene layer 2 is 0.03-1 mm.

[0043] In one embodiment, the top end of the first shell monomer 11 and the bottom end of the second shell monomer 12 are provided with circular mounting holes, the circular mounting holes are coaxially arranged with the shell body, and a lead-through assembly 14 in sealing cooperation with the mounting holes is mounted at the mounting holes.

[0044] In the embodiment, a cavity structure is formed in the shell body, the cavity structure is used for mounting the battery cell 4, the mounting holes provided at the end portions of the first shell monomer 11 and the second shell monomer 12 are used for mounting the lead-through assembly 14, and the lead-through assembly 14 is used for leading through the positive plate and the negative plate of the battery cell 4 accommodated in the cavity structure, so as to lead the battery cell 4 to the outside of the shell body and serve as the positive and negative electrodes of the battery. The battery cell 4 and the lead-through assembly 14 can be the battery cell 4 and the lead-through assembly 14 of the prior art.

[0045] On the other hand, the utility model also provides a battery, which uses the above-mentioned battery metal shell as its shell.

[0046] In one embodiment, the battery comprises a cylindrical battery cell 4, the battery cell 4 is wound by sequentially stacking a positive plate, a diaphragm and a negative plate, the battery cell 4 is embedded in the shell body, and the outer diameter of the battery cell 4 is the same as the inner diameter of the first shell monomer 11 and the second shell monomer 12.

[0047] In the embodiment, the outer diameter of the battery cell 4 is the same as the inner diameter of the first shell body 11 and the second shell body 12, so that after the battery cell 4 is embedded into the shell body, the battery cell 4 can play a role of supporting and fixing the first shell body 11 and the second shell body 12, and the relative bending of the first shell body 11 and the second shell body 12 in the use process of the shell body can be effectively avoided, that is, the relatively soft aluminum-plastic film belt 3 can be protected, and the aluminum-plastic film belt 3 can be prevented from being pulled.

[0048] The above embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled persons in the art, under the premise of not departing from the utility model concept, a number of deformations and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A segmented battery metal casing comprising a casing body, characterized in that, The shell body is formed by combining a first shell monomer and a second shell monomer arranged in an up-down manner, the first shell monomer is in a cylindrical shape with an open lower end, the second shell monomer is in a cylindrical shape with an open upper end, the axis of the second shell monomer and the first shell monomer is located on the same vertical line, and the outer diameter and the inner diameter of the second shell monomer and the first shell monomer are the same; the upper end of the second shell monomer is fixedly connected with the lower end of the first shell monomer through an aluminum plastic film belt in an annular shape, the aluminum plastic film belt is simultaneously sleeved on the lower end of the first shell monomer and the upper end of the second shell monomer, and is fixedly connected with the first shell monomer and the second shell monomer in a mutually sealed manner.

2. A segmented battery metal casing according to claim 1, wherein, The first shell monomer and the second shell monomer also have a gap therebetween.

3. A segmented battery metal casing according to claim 2, wherein, The area covered by the aluminum plastic film belt on the first shell monomer and the second shell monomer forms an adhesion area, the adhesion area is provided with a polypropylene layer, the aluminum plastic film belt is adhered to the first shell monomer and the second shell monomer through the polypropylene layer, and is fixedly and sealingly matched with the first shell monomer and the second shell monomer.

4. A segmented battery metal casing according to claim 3, wherein, The surface roughness of the adhesion area on the first shell monomer and the second shell monomer is greater than the surface roughness of other areas on the first shell monomer and the second shell monomer.

5. A segmented battery metal casing according to claim 4, wherein, The thickness of the polypropylene layer is 0.03-1mm.

6. A segmented battery metal casing according to claim 3 or 5, wherein, The top end of the first shell monomer and the bottom end of the second shell monomer are both provided with a circular mounting hole, the circular mounting hole is coaxially arranged with the shell body, and a lead-through assembly in sealing cooperation with the mounting hole is mounted at the mounting hole.

7. A battery, characterized by The battery metal shell comprises the battery metal shell according to any one of claims 1-6.

8. A battery according to claim 7, wherein The battery metal shell comprises a cylindrical-shaped battery core, the battery core is formed by winding a positive electrode sheet, a separator and a negative electrode sheet in sequence, the battery core is embedded in the shell body, and the outer diameter of the battery core is the same as the inner diameter of the first shell monomer and the second shell monomer.

Images