Method for manufacturing secondary battery

Patent metadata

Field	Value
Publication number	US-2020403263-A1
Application number	US-201816764625-A
Country	US
Kind code	A1
Filing date	Dec 7, 2018
Priority date	Dec 15, 2017
Publication date	Dec 24, 2020
Grant date	—

Abstract

The present invention is a method for manufacturing a secondary battery. An electrode assembly and an electrolyte are accommodated into a body of a battery case. The body of the battery case has an accommodation part and a gas pocket part, and a passage that extends from the accommodation part to the outside discharges an internal gas from the accommodation part through the gas pocket part. The battery case is seated in a seating step on a support block, which has an inclined part on a side surface thereof, to support the battery case. The body is pressed to discharge a gas accommodated in the accommodation part through the gas pocket part in the battery case. This method allows easy discharging of internal gas while reducing discharge of the electrolyte with the gas.

First claim

1 - 30 . (canceled)

31 . A method for manufacturing a secondary battery, the method comprising:
a formation step of accommodating an electrode assembly and an electrolyte into a body of a battery case, wherein the body of the battery case comprises an accommodation part and a gas pocket part, wherein a passage is formed in the body of the battery case that extends from the accommodation part through the gas pocket part to an outside, and wherein the passage is capable of discharging an internal gas from the accommodation part; a seating step of seating the body of the battery case on a support block, which has an inclined part on a side surface and the inclined part supports the body of the battery case, wherein the gas pocket part is bent and seated on a top surface of the support block; and a gas discharge step of pressing the body of the battery case to discharge a gas accommodated in the accommodation part into the passage and through the gas pocket part to the outside.

32 . The method of claim 31 , wherein, in the gas discharge step, an outer surface of the body is surface-pressed through a pusher provided as a tilt press.

33 . The method of claim 31 , wherein, in the gas discharge step, an outer surface of the body is rolled to be pressed through a pusher provided as a roll press.

34 . The method of claim 31 , wherein the support block has a planar top surface and a planar bottom surface, which are parallel to each other, and a side surface having an inclined part that is inclined with respect to the top and bottom surfaces, and
in the seating step, the body of the battery case is inclinedly disposed on the support block so as to be seated on the inclined part of the support block, and the gas pocket part is bent with respect to the body so as to be seated on the top surface of the support block.

35 . The method of claim 34 , wherein, in the seating step, the battery case is seated on the support block of which the side surface is inclined at an angle of 30 degrees to 60 degrees with respect to the bottom surface.

36 . The method of claim 34 , wherein a corner portion of the support block, which faces the bent portion of the gas pocket part is chamfered to form a two-stage bent part, and
in the seating step, the gas pocket part is bent in two stages in a shape corresponding to the two-stage bent part of the support block.

37 . The method of claim 31 , wherein the formation step further comprises a first sealing step of sealing an edge of the battery case to seal the accommodation part and the gas pocket part, and
the gas discharge step further comprises a piercing step of piercing the gas pocket part to form one or more holes so that the internal gas is discharged through the one or more holes in the gas pocket part.

38 . A method for manufacturing a secondary battery, the method comprising:
a formation step of accommodating an electrode assembly and an electrolyte into a body of a battery case, wherein the body of the battery comprises an accommodation part and a gas pocket part, wherein a passage in the body of the battery case extends from the accommodation part through the gas pocket part to an outside, wherein the passage is capable of discharging an internal gas from the accommodation part; a seating step of seating the gas pocket part on a support block, which has an inclined part on a side surface thereof, to support the gas pocket part in the battery case; and a gas discharge step of pressing the body to discharge a gas accommodated in the accommodation part through the gas pocket part in the battery case, wherein, in the seating step, the gas pocket part is seated on the inclined part of the support block.

39 . The method of claim 38 , wherein the support block comprises a triangular block and a rectangular block, each of which has the inclined part, and
wherein in the seating step, an extension part of the gas pocket part, which extends from the body, is seated on the inclined part of the triangular block, and an end of the gas pocket part is seated on the rectangular block.

40 . The method of claim 38 , wherein the seating step further comprises a fixing step of fixing a corner portion of the body through a fixing block in the battery case,
wherein the fixing block is supported by an elastic member.

41 . A method for manufacturing a secondary battery, the method comprising:
a formation step of accommodating an electrode assembly and an electrolyte into a body of a battery case, wherein the body of the battery case comprises an accommodation part and a gas pocket part, wherein a passage is formed in the body of the battery case that extends from the accommodation part through the gas pocket part to an outside, and wherein the passage is capable of discharging an internal gas from the accommodation part; a supporting step of disposing the battery case so as to be supported on a support block; and a gas discharge step of pressing the body to discharge a gas accommodated in the accommodation part through the gas pocket part in the battery case, wherein, in the supporting step, the body of the battery case is disposed on a side surface of the support block, and the gas pocket part is bent to be disposed on a top surface of the support block.

42 . The method of claim 41 , wherein, in the gas discharge step, the body is pressed through a pusher.

43 . The method of claim 41 , wherein the support block has a vertical side surface and a horizontal top surface, and
in the supporting step, the body of the battery case is vertically disposed to face the side surface of the support block, and the gas pocket part is bent at a right angle with respect to the body so as to be seated on the top surface of the support block.

44 . The method of claim 43 , wherein a corner portion of the support block, which faces the bent portion of the gas pocket part is chamfered to form a two-stage bent part, and
in the supporting step, the gas pocket part is bent in two stages in a shape corresponding to the two-stage bent part of the support block.

45 . The method of claim 41 , wherein the formation step further comprises a first sealing step of sealing an edge of the battery case to seal the accommodation part and the gas pocket part, and
the gas discharge step further comprises a piercing step of piercing the gas pocket part so that the internal gas is discharged through the gas pocket part.

46 . The method of claim 41 , wherein the supporting step further comprises a fixing step of closely attaching the battery case to the support block through a fixing means to fix the battery case.

47 . The method of claim 46 , wherein the fixing means comprises an attachment block and a tension coil spring providing tensile force that pulls the attachment block in a direction of the support block, and
in the fixing step, the battery case is disposed between the attachment block and the support block to fix the battery case to the support block through the tensile force applied to the attachment block.

48 . The method of claim 45 , wherein the supporting step further comprises a vacuum fixing step of fixing an end of the gas pocket part to the support block through vacuum in the battery case.

49 . The method of claim 48 , wherein, in the support block, a suction hole of a vacuum tube connected to a vacuum part is provided in a top surface on which the end of the gas pocket part is seated, and
in the vacuum fixing step, the inside of the vacuum tube is vacuumized to vacuum-suct

Assignees

• Lg Chemical Ltd

Inventors

• Bae Dong Hun
• Park Hyo Jin
• Hong Suk Hyun
• Bae Joon Sung
• Lee Beom Koon
• Lim Dae Bong
• Heo Jin Woo

Classifications

• H01M50/317

  Re-sealable arrangements · CPC title

• H01M10/52

  Removing gases inside the secondary cell, e.g. by absorption (vent plugs or other mechanical arrangements for facilitating escape of gases H01M50/30) · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/049 Primary

  Processes for forming or storing electrodes in the battery container · CPC title

• H01M10/0404

  Machines for assembling batteries · CPC title