CN112542640A

CN112542640A - Diameter reducing process of battery shell, manufacturing process of battery and diameter reducing die

Info

Publication number: CN112542640A
Application number: CN202011301366.4A
Authority: CN
Inventors: 兰涛; 刘金锁; 蔡小娟; 张海波
Original assignee: Shenzhen Highpower Technology Co Ltd
Current assignee: Shenzhen Highpower Technology Co Ltd
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2021-03-23

Abstract

The invention discloses a diameter reducing process of a battery shell, a process for manufacturing a battery and a diameter reducing die, wherein the diameter reducing process of the battery shell comprises the following steps of preparing a malleable metal shell, wherein the metal shell is sequentially provided with a first bottom part, a first shell body and a first opening part; providing a reducing die, wherein the inner diameter of a reducing hole of the reducing die is the same as the outer diameter of the second shell body; and sliding the reducing die on the outer side of the first shell body, and compressing the outer diameter of the first shell body to the outer diameter of the second shell body through the reducing hole by the reducing die. By adopting the metal shell, more active substances can be filled in the cavity, so that the energy level of the battery is improved; meanwhile, the metal shell can be made into a required second shell body by adopting a reducing die so as to obtain a finished battery.

Description

Diameter reducing process of battery shell, manufacturing process of battery and diameter reducing die

Technical Field

The invention relates to the technical field of batteries, in particular to a diameter reducing process of a battery shell, a manufacturing process of a battery and a diameter reducing mold.

Background

In the related art, when a battery is manufactured, a metal case is provided, and an active material, a battery electrode group, and the like are filled in the metal case. Because the first shell body of the metal shell is limited by the standard size, the cavity in the first shell body is in the corresponding size, so that the cavity can be filled with the active substances in the corresponding quantity, the energy of the battery is in the corresponding energy level, and the battery with the energy level can not meet the requirements of users.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a diameter reducing process of a battery shell, which can facilitate the manufacture of a battery.

The invention also provides a manufacturing process of the battery.

The invention also provides a reducing die.

According to the diameter reducing process of the battery shell, the diameter reducing process comprises the following steps:

the method comprises the following steps:

s100, preparing a malleable metal shell, wherein the metal shell sequentially comprises a first bottom, a first shell body and a first opening part, a cavity for accommodating a battery pole group is defined between the first shell body and the first bottom, and a packaging opening is defined in the first opening part and can be used for inserting the battery pole group into the cavity; the finished battery made of the metal shell is provided with a shell, wherein the shell is sequentially provided with a second bottom part, a second shell body and a second opening part, and the inner diameter and the outer diameter of the first shell body are larger than those of the second shell body;

s200, providing a reducing die with a reducing hole, wherein the inner diameter of the reducing hole is the same as the outer diameter of the second shell body;

s300, sliding the reducing die on the outer side of the first shell body along the length direction of the first shell body, wherein the reducing die compresses the outer diameter of the first shell body to the outer diameter of the second shell body through the reducing hole.

The diameter reducing process of the battery shell provided by the embodiment of the invention at least has the following technical effects: by adopting the metal shell, more active substances can be filled in the cavity, so that the energy level of the battery is improved, and the requirements of users are met; meanwhile, the metal shell can be made into a required finished battery by adopting the diameter reducing die, so that the scheme is implemented.

According to some embodiments of the invention, the first opening portion has inner and outer diameters larger than inner and outer diameters of the second opening portion.

According to some embodiments of the invention, the first opening portion has a thickness greater than a thickness of the first case body.

According to some embodiments of the invention, a chamfer is provided between the first shell and the first bottom, and the reducing hole is slidable to an outer side of the first shell through the chamfer.

According to some embodiments of the invention, the diameter of the first bottom is the same size as the diameter of the second bottom.

According to some embodiments of the invention, the metal shell is made of SPCE material.

The manufacturing process of the battery according to the second aspect of the present invention, including the above diameter reduction process of the battery case, further includes the following steps before the step S300: providing a battery pole group, and inserting the battery pole group into the cavity through the packaging opening; pre-shrinking the first opening portion and compressing an outer diameter of the first opening portion to an outer diameter of the second opening portion; and providing a battery pole cap, and packaging the first opening part and the battery pole cap.

The manufacturing process of the battery provided by the embodiment of the invention at least has the following beneficial effects: by adopting the scheme, the battery with higher energy can be prepared; meanwhile, the cavity of the first shell body is enlarged, so that the battery pole group is not easy to puncture the side wall of the first shell body, and the forming rate of the battery is higher.

According to the diameter reducing die of the third aspect of the present invention, the diameter reducing die is used for compressing a metal shell having ductility into a shell of a finished battery, the metal shell sequentially has a first bottom portion, a first shell body and a first opening portion, a cavity for accommodating a battery pole group is defined between the first shell body and the first bottom portion, the first opening portion defines a packaging opening, the packaging opening is capable of allowing the battery pole group to be inserted into the cavity, the shell sequentially has a second bottom portion, a second shell body and a second opening portion, wherein the inner and outer diameter dimensions of the first shell body are larger than those of the second shell body, the diameter reducing die includes a diameter reducing hole, and the diameter reducing die is capable of sliding on the outer side of the first shell body along the length direction of the first shell body so as to compress the first shell body.

The diameter reducing die provided by the embodiment of the invention has at least the following beneficial effects: through the setting of reducing hole, the lateral wall of the first shell of the even compression of reducing hole makes the external diameter of first shell the same with the external diameter of second shell, and then makes the preparation of battery can be implemented.

According to some embodiments of the invention, the diameter of the reduced diameter hole is gradually reduced to the size of the outer diameter of the second housing body along the sliding direction of the first housing body.

According to some embodiments of the invention, the diameter of the reduced diameter bore is the same size as the outer diameter of the second shell.

According to some embodiments of the invention, the reducing die is provided with a guide hole which is communicated with the reducing hole and is coaxially arranged, and a diameter of the guide hole is gradually reduced to an outer diameter of the second shell body along a sliding direction of the first shell body.

According to some embodiments of the invention, the reducing hole is provided with a demoulding hole which is communicated with the reducing hole and is coaxially arranged, and the diameter of the demoulding hole is larger than that of the reducing hole.

According to some embodiments of the invention, further comprising: the positioning seat is arranged on the reducing die, a positioning hole which is coaxial with the reducing hole is formed in the positioning seat, and the diameter of the positioning hole is the same as the outer diameter of the first shell body.

According to some embodiments of the invention, a placing opening communicated with the positioning hole is formed in the side wall of the positioning seat, and the first shell body is placed in the positioning hole through the placing opening.

According to some embodiments of the invention, the placing opening communicates with a side of the positioning socket facing the reducing die.

According to some embodiments of the invention, further comprising: the reducing die is detachably connected to the mounting seat.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic flow diagram of a diameter reduction process for a battery case according to an embodiment of the invention;

FIG. 2 is a schematic flow chart of a battery manufacturing process according to an embodiment of the invention;

FIG. 3 is a schematic view of the structure of a metal shell in embodiment S1 of the present invention;

FIG. 4 is a schematic view of the internal structure of the metal shell in embodiment S2 of the present invention;

fig. 5 is a schematic structural view of the metal shell after the metal shell is pre-shrunk with the first opening portion in the embodiment S3 of the present invention;

fig. 6 is a schematic structural diagram of the metal shell after the first opening is sealed in S4 according to the embodiment of the present invention;

FIG. 7 is a schematic structural view of a battery and a diameter reducing die in S5 according to an embodiment of the present invention;

FIG. 8 is a schematic structural view of a reducing die according to an embodiment of the invention;

FIG. 9 is a schematic diagram of an exploded view of a reducing die in accordance with the practice of the present invention;

FIG. 10 is a vertical cross-sectional view of a reduced diameter hole according to an embodiment of the invention;

FIG. 11 is a vertical cross-sectional view of another reduced diameter bore of an embodiment of the present invention;

FIG. 12 is a vertical cross-sectional view of a release film of an embodiment of the present invention;

FIG. 13 is a vertical cross-sectional view of another release film of an embodiment of the present invention.

Reference numerals:

the battery comprises a metal shell 100, a first bottom 110, a first shell body 120, a first opening 130, a cavity 140, a packaging opening 150, a chamfer 160, a battery pole cap 170 and an annular boss 171;

the diameter reducing die comprises a diameter reducing die 200, a diameter reducing die 210, a diameter reducing hole 211, a guide hole 212, a demolding hole 213, a positioning seat 220, a positioning hole 221, a placing opening 222 and a mounting seat 230.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the directions or positional relationships indicated by "upper", "lower", and the like are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but 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 thus, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The diameter reducing process of the battery shell according to the embodiment of the first aspect of the invention, referring to fig. 1 and 3, includes the following steps:

s100, preparing a malleable metal casing 100, where the metal casing 100 sequentially has a first bottom 110, a first casing body 120, and a first opening 130, a cavity 140 for accommodating a battery pole group is defined between the first casing body 120 and the first bottom 110, the first opening 130 defines a package opening 150, and the package opening 150 enables the battery pole group to be inserted into the cavity 140; the finished battery made of the metal can 100 has a case having a second bottom, a second body, and a second opening in this order, wherein the inner and outer diameters of the first body 120 are greater than those of the second body;

s200, providing a reducing die 200 with a reducing hole 211, wherein the inner diameter of the reducing hole 211 is the same as the outer diameter of the second shell body;

s300, sliding the reducing die 200 on the outer side of the first housing 120 along the length direction of the first housing 120, and compressing the outer diameter of the first housing 120 to the outer diameter of the second housing by the reducing die 200 through the reducing hole 211.

As can be seen from step S1, in the embodiment, the inner diameter of the first shell 120 is larger than the inner diameter of the second shell 120, and the cavity 140 between the first bottom 110 and the first shell 120 is enlarged, so that the battery pole set is conveniently inserted into the cavity 140, and the battery pole set is not easy to pierce the side wall of the first shell 120; meanwhile, the space of the cavity 140 is increased, so that more active substances can be filled into the cavity 140, the energy level of the battery is increased, and the requirements of users are met.

Since the first housing body 120 has a larger outer diameter than the second housing body 120, the first housing body 120 is ensured to have a certain thickness, and the first housing body 120 is ensured to have a certain strength. Based on this, as can be seen from step S2, a diameter-reducing die 200 is provided, and the inner diameter of the diameter-reducing hole 211 of the diameter-reducing die 200 is the same as the outer diameter of the finished battery; at this time, when the diameter reducing die 200 slides in the longitudinal direction of the first housing 120 outside the first housing 120 through the diameter reducing hole 211, the diameter reducing hole 211 compresses the first housing 120, thereby compressing the outer diameter of the first housing 120 to the outer diameter of the second housing 120 to manufacture a finished battery.

In this embodiment, since the metal shell 100 is made of a ductile material, when the diameter-reducing die 200 slides along the outer wall of the first housing 120, the side wall of the diameter-reducing hole 211 can press the first housing 120, and at this time, the first opening 130 absorbs the excess portion of the first housing 120, so that this embodiment is implemented.

In addition, steps S100 and S200 do not define a sequential order, i.e., S100 may be implemented before S200, or S200 may be implemented before S100.

In some embodiments, the inner diameter of the first opening portion 130 is greater than the inner diameter of the first opening portion 130 of the finished battery, so that the sealing opening 150 of the first opening portion 130 is enlarged, thereby facilitating the filling of the active material into the cavity 140 through the sealing opening 150, facilitating the insertion of the battery pole piece into the cavity 140, and preventing the battery pole piece group from puncturing the side wall of the first opening portion 130.

In a further embodiment, the outer diameter of the first opening portion 130 is larger than the outer diameter size of the second opening portion 130, and the thickness of the first opening portion 130 is secured, thereby securing the strength of the first opening portion 130.

In some embodiments, the thickness of the first opening portion 130 is greater than that of the first housing body 120, that is, the wall thickness of the first opening portion 130 is greater than that of the first housing body 120 by 0.3mm to 0.8mm, thereby ensuring the mechanical strength of the first opening portion 130 and improving the packaging strength of the battery packaging opening 150.

In some embodiments, a chamfer 160 is disposed between the first shell 120 and the first bottom 110, the chamfer 160 is a rounded corner, and the reducing hole 211 can slide to the outside of the first shell 120 through the chamfer 160, so as to uniformly compress the periphery of the first shell 120.

In some embodiments, the diameter of the first bottom portion 110 is the same size as the diameter of the second bottom portion 110, such that the reduced diameter hole 211 can slide faster past the first bottom portion 110 to compress the first housing section 120, thereby enabling implementation of the solution.

In some embodiments, the metal shell 100 is made of SPCE material, which is ductile, thereby allowing the reduced diameter bore 211 to better compress the first shell 120.

The manufacturing process of the battery according to the embodiment of the second aspect of the invention, referring to fig. 2, specifically includes the following steps:

step 1, providing a specially-made metal shell 100;

step 2, providing a battery pole group, wherein the battery pole group is inserted into the cavity 140 through the packaging opening 150;

step 3, pre-shrinking the first opening part 130, and compressing the outer diameter of the first opening part 130 to the outer diameter of the second opening part 130;

and step 4, providing a battery pole cap 170, and packaging the first opening part 130 and the battery pole cap 170.

And 5, providing a reducing mold 200, and compressing the outer diameter of the first shell body 120 to the outer diameter of the second shell body 120 to manufacture the required finished battery.

Each step was further analyzed:

referring to fig. 3, in the step 1, the specially made metal shell 100 is provided, the inner and outer diameters of the first shell 120 of the metal shell 100 are 0.15mm to 0.65mm larger than the inner and outer diameters of the second shell 120, and simultaneously, the inner and outer diameters of the first opening 130 of the metal shell 100 are 0.15mm to 0.65mm larger than the inner and outer diameters of the second opening 130, so that the cavity 140 inside the metal shell 100 is enlarged and the inner diameter of the sealing opening 150 of the metal shell 100 is enlarged.

Referring to fig. 4, during step 2, a battery pole pack is provided, which is inserted into the cavity 140 through the package opening 150. As can be seen from the above, since the cavity 140 inside the metal shell 100 is enlarged, the diameter of the opening of the metal shell 100 is enlarged, and therefore, the battery pole piece can better insert the battery pole group into the cavity 140 through the packaging opening 150; when the battery pole set is inserted into the cavity 140, the battery pole set is not easy to pierce the side walls of the opening 130 and the first housing 120.

It can be understood that, as the space inside the cavity 140 is increased, the cavity 140 can be filled with more active material to increase the energy level of the battery.

The specific experimental data are as follows:

after the battery pole group is inserted into the first housing 120, a battery pole cap 170 of the battery is inserted into the first opening 130 and electrically connected to the battery pole group, and the battery pole cap 170 is a positive electrode of the battery.

Referring to fig. 5, in step 3, the first opening 130 is pressed by the pressing die, and the first opening 130 is deformed to have the same outer diameter as that of the second housing 120, so that the pre-reduced first opening 130 does not affect the use of the diameter reducing die 200, and step S4 is performed.

Referring to fig. 6, during step 4, the manufacturer performs encapsulation and mounding of the first opening 130, specifically, by using an encapsulation head, which completely presses the upper portion of the first opening 130 onto the annular projection 171 of the battery pole cap 170, i.e., adheres to the side of the annular projection 171 away from the cavity 140, so as to seal the battery pole cap 170 and the first opening 130; further, another packaging head is used, in which a predetermined external force is applied to the inside of the first opening 130 through the outer wall of the first opening 130, the side wall of the first opening 130 is recessed toward the inside of the first opening 130, and the inner wall of the first opening 130 is attached to the lower surface of the annular projection 171, that is, to the side of the annular projection 171 close to the cavity 140, thereby further improving the sealing between the battery electrode cap 170 and the first opening 130.

Referring to fig. 7, in the step 5, the reducing hole 211 of the reducing mold 200 is used, the reducing hole 211 is gradually slid to the outer side of the first housing body 120 through the chamfer 160, and the reducing hole 211 uniformly compresses the first housing body 120 during sliding, so that the first housing body 120 is compressed to the outer diameter of the second housing body, thereby manufacturing the desired finished battery.

In this embodiment, the metal shell 100 is made of a malleable material, so that when the diameter-reducing die 200 slides along the outer wall of the first shell 120, the side wall of the diameter-reducing hole 211 can press the first shell 120 upward, and the first shell 120 extends upward, that is, the excess portion of the first shell 120 is pressed to the first opening 130; and since the bottom and the top of the battery are positioned, the inner wall of the first opening portion 130 is extended inward, thereby completing the absorption of the surplus portion of the first housing body 120 and securing the battery at a standard length.

Referring to fig. 8, the reducing die 200 according to the third embodiment of the present invention includes a mounting base 230, a reducing die 210, and a positioning base 220, the mounting base 230 is mounted on a corresponding reducing device, the reducing die 210 is mounted on the mounting base 230, the positioning base 220 is mounted on the mounting base 230 and positioned above the reducing die 210, and the reducing hole 211 is provided on the reducing die 210.

Specifically, an operator places the packaged battery on the reducing die 210, and under the action of an external force, the first housing body 120 slides through the reducing hole 211 through the first bottom 110, and the reducing hole 211 uniformly compresses the first housing body 120, so that the outer diameter of the first housing body 120 is compressed to the size of the outer diameter of the second housing body; in addition, the positioning seat 220 precisely aligns the battery with the reduced diameter hole 211, further allowing the first housing 120 to be uniformly compressed.

In some embodiments, the reduced diameter bore 211 has two configurations,

referring to fig. 10 and 11, a circular reducing hole 211 is vertically formed in the reducing die 210, the diameter of the reducing hole 211 is gradually reduced to the outer diameter of the second housing along the sliding direction of the first housing 120, that is, the upper surface and the lower surface of the reducing die 210 are communicated with the reducing hole 211, and the reducing hole 211 is gradually reduced to the outer diameter of the second housing from the upper end to the lower end of the reducing hole 211. Therefore, when the first housing body 120 vertically slides through the diameter reducing hole 211, the inner wall of the diameter reducing hole 211 gradually compresses the first housing body 120 upwards from the bottom of the first housing body 120, so that the outer diameter of the first housing body 120 is uniformly compressed to the outer diameter of the second housing body, thereby manufacturing the required battery.

In addition, the diameter of the top opening of the reduced-diameter hole 211 is larger, so that the first shell body 120 can be conveniently and vertically placed in the reduced-diameter hole 211.

Referring to fig. 12 and 13, a circular reducing hole 211 is vertically formed in the reducing die 210, and the diameter of the reducing hole 211 is the same as the outer diameter of the second housing along the sliding direction of the first housing 120. That is, the diameter-reducing hole 211 communicates with the upper surface and the lower surface of the diameter-reducing die 210, the diameter of the diameter-reducing hole 211 is uniform from the upper end to the lower end of the diameter-reducing hole 211, and the first housing body 120 slides into the diameter-reducing hole 211 by the chamfer 160 at the bottom thereof.

In a further embodiment, referring to fig. 12 and 13, the diameter reducing die 210 is provided with a guide hole 212 for the first housing body 120 to slide into the diameter reducing hole 211, and the diameter of the guide hole 212 is gradually reduced to the outer diameter of the second housing body 120 along the sliding direction of the first housing body 120; that is, the guide hole 212 is vertically opened on the reducing die 210 and coaxially arranged with the reducing hole 211, an upper port of the guide hole 212 is communicated with the top of the reducing die 210, a lower port of the guide hole 212 is communicated with an upper port of the reducing hole 211, and the guide hole 212 is gradually reduced to the outer diameter of the second housing from the upper port thereof to the upper port of the reducing hole 211; thereby, the guide hole 212 gradually compresses the circumference of the first housing body 120 to slide into the reduced-diameter hole 211.

In addition, the diameter of the top opening of the guide hole 212 is large, so that the first housing body 120 can be conveniently vertically placed in the guide hole 212.

In some embodiments, referring to fig. 9, the battery is further stably and vertically slid in the diameter-reduced hole 211, the positioning seat 220 is vertically fixed on the top of the mounting seat 230, the positioning seat 220 is vertically mounted on the mounting seat 230 through a bolt, the positioning seat 220 is vertically provided with a positioning hole 221, the positioning hole 221 is coaxially arranged with the diameter-reduced hole 211, and the diameter of the positioning hole 221 is equal to the outer diameter of the first shell 120; wherein, the depth of the first diameter-reducing hole 211 or the guide hole 212 is smaller than the length of the first housing body 120.

Specifically, when the first housing body 120 is compressed, the lower end of the first housing body 120 abuts against the first kind of reduced diameter hole 211 or the guide hole 212, that is, abuts against the inclined surface of the first kind of reduced diameter hole 211 or the guide hole 212, and the upper portion of the first housing body 120 is located in the positioning hole 221, and at this time, the positioning hole 221 positions the first housing body 120, so that the first housing body 120 is vertically placed in the first kind of reduced diameter hole 211 or the guide hole 212; at this time, the central axis of the first housing body 120 coincides with the central axis of the diameter-reducing hole 211, so that the periphery of the first housing body 120 is uniformly compressed in the following.

In some embodiments, referring to fig. 9, in order to facilitate placing and adjusting the battery in the positioning hole 221, a placing opening 222 is formed in a side wall of the positioning seat 220, the placing opening 222 is communicated with an inner wall of the positioning hole 221, and the battery to be compressed is vertically placed in the positioning hole 221 through the placing opening 222.

Moreover, the placing opening 222 is communicated with the first bottom 110 and the top of the positioning seat 220, and the positioning seat 220 does not completely cover the periphery of the first diameter-reducing hole 211 or the guiding hole 212, so that if a certain battery fails to be compressed and cannot pass through the diameter-reducing hole 211, an operator can timely take out the waste battery which fails to be compressed through the bottom of the positioning hole 221.

In addition, the positioning seat 220 is detachably mounted on the mounting seat 230, so that a user can replace the positioning seat 220 according to the size of the battery to be processed, thereby adapting to the use of other batteries.

In some embodiments, referring to fig. 9, during the fabrication of the reducing die 210, the reducing die 210 has a certain thickness in the vertical direction, thereby ensuring the strength of the reducing die 210; the length of the battery is limited to be small, and the depth of the first diameter-reducing hole 211 or the guide hole 212 cannot be large, so that when the battery is placed vertically, the lower part of the first shell 120 abuts against the inner wall of the first diameter-reducing hole 211 or the guide hole 212, and the upper part of the first shell 120 can be positioned in the positioning hole 221; based on this situation, referring to fig. 10, it is avoided that the first housing body 120 cannot be well placed in the first diameter-reducing hole 211, referring to fig. 12, or the first housing body 120 is easily clamped in the second diameter-reducing hole 211; therefore, the lower portion of the reducing die 210 is provided with a demolding hole 213 coaxially arranged with the reducing hole 211, an upper port of the demolding hole 213 is communicated with the reducing hole 211, a lower port of the demolding hole 213 is communicated with the bottom of the reducing die 210, and the diameter of the demolding hole 213 is larger than the outer diameter of the second shell, so that the first shell 120 is compressed through the reducing hole 211 and separated from the reducing hole 211 through the demolding hole 213, and the first shell 120 is convenient to take out.

It should be noted that the release hole 213 has two forms, referring to fig. 10 or 12, the release hole 213 is gradually enlarged from the upper end to the lower end thereof, and the upper end of the release hole 213 is just the same as the diameter of the reduced diameter hole 211, whereby the diameter inside the release hole 213 is larger than the diameter of the reduced diameter hole 211, thereby facilitating the detachment of the battery. Referring to fig. 11 or 13, the demolding hole 213 is uniform from the upper port to the lower port thereof, and the demolding hole 213 has a diameter greater than that of the reduced-diameter hole 211, thereby facilitating the detachment of the battery.

In the description of the present specification, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The diameter reducing process of the battery shell is characterized by comprising the following steps of:

2. The diameter reduction process for battery cases according to claim 1, wherein the inside and outside diameter dimensions of the first opening portion are larger than the inside and outside diameter dimensions of the second opening portion.

3. The diameter reduction process for a battery case according to claim 1, wherein the thickness of the first opening portion is larger than the thickness of the first case body.

4. The diameter reducing process for a battery case according to claim 1, wherein a chamfer is provided between the first case body and the first bottom, and the diameter reducing hole can slide to the outside of the first case body through the chamfer.

5. The diameter reduction process for battery cases of claim 4, wherein the diameter of the first bottom is the same as the diameter of the second bottom.

6. The diameter reduction process for a battery case of claim 1, wherein the metal shell is made of SPCE material.

7. A process for manufacturing a battery, comprising the diameter reducing process for a battery case according to any one of claims 1 to 6, further comprising, before the step S300, the steps of:

providing a battery pole group, and inserting the battery pole group into the cavity through the packaging opening;

pre-shrinking the first opening portion and compressing an outer diameter of the first opening portion to an outer diameter of the second opening portion;

and providing a battery pole cap, and packaging the first opening part and the battery pole cap.

8. The reducing die is characterized in that the reducing die is used for compressing a metal shell with ductility into a shell of a finished battery, the metal shell is sequentially provided with a first bottom, a first shell body and a first opening part, a cavity used for accommodating a battery pole group is defined between the first shell body and the first bottom, a packaging opening is defined by the first opening part, the packaging opening can supply the battery pole group to be inserted into the cavity, the shell is sequentially provided with a second bottom, a second shell body and a second opening part, the inner diameter and the outer diameter of the first shell body are larger than those of the second shell body, the reducing die comprises a reducing die, the reducing die is provided with a reducing hole, and the reducing die can slide in the outer side of the first shell body along the length direction of the first shell body to compress the first shell body.

9. The reducing die of claim 8, wherein the diameter of the reducing hole is gradually reduced to an outer diameter of the second housing along a sliding direction of the first housing.

10. The reducing die of claim 8, wherein the diameter of the reducing bore is the same size as the outer diameter of the second shell.

11. The reducing die of claim 10, wherein the reducing die is provided with a guide hole which is coaxially arranged and communicated with the reducing hole, and the diameter of the guide hole is gradually reduced to the outer diameter of the second shell body along the sliding direction of the first shell body.

12. The reducing die as set forth in claim 8, wherein the reducing hole is provided with a demolding hole which is communicated with the reducing hole and is coaxially arranged, and the demolding hole has a diameter larger than that of the reducing hole.

13. A diameter reducing die according to any one of claims 9 to 11, further comprising:

the positioning seat is arranged on the reducing die, a positioning hole which is coaxial with the reducing hole is formed in the positioning seat, and the diameter of the positioning hole is the same as the outer diameter of the first shell body.

14. The reducing die as set forth in claim 13, wherein the side wall of the positioning seat is provided with a placing opening communicating with the positioning hole, and the first housing can be placed in the positioning hole through the placing opening.

15. The reducing die of claim 14, wherein the rest port communicates with a side of the locating socket facing the reducing die.

16. The reducing die of claim 8, further comprising:

the reducing die is detachably connected to the mounting seat.