Method for producing secondary battery

Patent metadata

Field	Value
Publication number	US-11639015-B2
Application number	US-202117466519-A
Country	US
Kind code	B2
Filing date	Sep 3, 2021
Priority date	Sep 10, 2020
Publication date	May 2, 2023
Grant date	May 2, 2023

Abstract

A method for producing a secondary battery includes a space formation step and an injection molding step. In the space formation step, an outer periphery of a resin blocking portion with a quadrangular prism shape, in a terminal, is plugged to form a resin injection space around the terminal. In the injection molding step, a resin is injected into the injection space. The space formation step includes a constant-dimension pressing step and a constant-pressure pressing step. In the constant-dimension pressing step, a section between a pair of first outer peripheral surfaces of the resin blocking portion, extending parallelly to each other is pressed, whereby a distance between the first outer peripheral surfaces is brought to a predetermined distance. In the constant-pressure pressing step, a section between a pair of second outer peripheral surfaces of the resin blocking portion, extending in a direction intersecting the first outer peripheral surfaces, is pressed.

First claim

What is claimed is:

1. A method for producing a secondary battery, the method comprising:
a space formation step of forming a resin injection space around a predetermined site of a terminal by plugging an outer periphery of a resin blocking portion, which has a quadrangular prism shape, of the terminal; and
an injection molding step of injection-molding a resin part on the terminal by injecting a resin into the injection space,
wherein the space formation step includes
a constant-dimension pressing step of pressing between a pair of first outer peripheral surfaces extending parallelly to each other, from among four outer peripheral surfaces of the resin blocking portion, thereby bringing a distance between the pair of first outer peripheral surfaces to a predetermined distance; and
a constant-pressure pressing step of pressing, at a predetermined pressure, between a pair of second outer peripheral surfaces extending in a direction that intersects the pair of first outer peripheral surfaces, from among the four outer peripheral surfaces of the resin blocking portion.

2. The method according to claim 1 , wherein,
in the resin blocking portion of the terminal, the distance between the pair of first outer peripheral surfaces is smaller than a distance between the pair of second outer peripheral surfaces.

3. The method according to claim 1 , wherein
in the constant-pressure pressing step, a constant-pressure pressing member is pressed against at least one of the pair of second outer peripheral surfaces, and 0≤(DA−T)≤50 μm is satisfied,
T is defined as a thickness, in a direction perpendicular to the pair of first outer peripheral surfaces, of a portion of contact of the constant-pressure pressing member with the at least one of the pair of second outer peripheral surfaces, and
DA is defined as a distance between the pair of first outer peripheral surfaces in a state where the constant-dimension pressing step has been performed.

4. The method according to claim 2 , wherein
in the constant-pressure pressing step, a constant-pressure pressing member is pressed against at least one of the pair of second outer peripheral surfaces, and 0≤(DA−T)≤50 μm is satisfied,
T is defined as a thickness, in a direction perpendicular to the pair of first outer peripheral surfaces, of a portion of contact of the constant-pressure pressing member with the at least one of the pair of second outer peripheral surfaces, and
DA is defined as a distance between the pair of first outer peripheral surfaces in a state where the constant-dimension pressing step has been performed.

Assignees

• Prime Planet Energy & Solutions Inc

Inventors

• Ehara Tsuyoshi
• Asadachi Hideki

Classifications

• B29C45/14639

  for obtaining an insulating effect, e.g. for electrical components · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• B29L2031/3468

  Batteries, accumulators or fuel cells (battery cases B29L2031/7146) · CPC title

• H01M10/04

  Construction or manufacture in general (H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence) · CPC title

• B29C45/14065 Primary

  Positioning or centering articles in the mould · CPC title