The invention relates to an airtightness detection method of a soft
package lithium battery. The airtightness detection method of the soft
package lithium battery comprises the following steps: putting a
battery cell into a
battery cell area, and putting an air bag into an air bag area; packaging a top sealing region, a side sealing region and a first sealing region;
puncturing the air bag area, and pumping out air in the air bag area; extruding the air bag to break the air bag so as to release the detected gas; guidingthe detected gas released by the air bag to the
battery cell area; packaging a
secondary packaging area; and detecting whether the detected gas escapes from the soft
package lithium battery or not. According to the airtightness detection method for the soft package
lithium battery provided by the invention, the
airbag internally containing the detected gas is placed in the
airbag area of the aluminum-plastic shell, the
airbag is crushed after the airbag area is subjectedto air exhaust, the detected gas is guided to the battery
cell area, and then the secondary sealing area is packaged to obtain the soft package
lithium battery, so that airtightness detection is carried out on the soft package
lithium battery; the result of the packaging effect of the soft package lithium battery can be directly obtained, the detection precision is high, and the missed judgment phenomenon is avoided.