Leakage detection method for lithium ion batteries

08-07-2015 дата публикации
Номер:
CN104764568A
Принадлежит: Zhongshan Tianmao Battery Co Ltd
Контакты:
Номер заявки: 00-10-20148195
Дата заявки: 08-01-2014

[1]

Technical Field

[2]

The invention relates to a lithium ion battery detection method, in particular to a method for the testing of a lithium ion battery.

[3]

Background Art

[4]

With the new market status of the energy industry increasingly lifting, lithium battery has become the focus of attention, the attendant is constantly influx of new enterprise, the main body by internal lithium battery industry restrictions and the level of development of the continuous impact of the foreign market, lithium electric industries have into the price competition and the quality of.

[5]

The current development is still a mainstream of the aluminum shell encapsulated lithium ion secondary cell which is, core by the laser welding apparatus and in the process for preparing the uncertainties, core produce blister, crack and other bad. These very difficult to distinguish with the naked eye. If it is not possible to effectively screening out, even the process flow to the customer, there may be leakage of the core, is a major defect. The laser welding in the industry the more common types of measuring leakage is to adopt a negative pressure vacuum the testing mode, but this way there is a defect, because the core of the negative pressure, the influence of external pressure, the weld bead core is in the closing state with the inside, a portion of the core because the leakage of the body part and internal core, to block the drain part of the, core caused by air leakage cannot be detected. Therefore dowsed a more effective leak detection process is very necessary.

[6]

Content of the invention

[7]

The purpose of this invention is directed to the above-mentioned problem, provides a method for the testing of a lithium ion battery.

[8]

In order to achieve the above-mentioned goal, the invention adopts the following technical scheme:

[9]

A method for the testing of a lithium ion battery, which is characterized by comprising the following steps:

[10]

(1), heating to be measured is put in the mould leaks the battery measuring leakage, the cylinder pushing plate for die fixed locking the battery;

[11]

(2), the battery to leak under the syringe, then the downlink the battery the liquid sealing and leakage testing syringe;

[12]

(3), pressure source start, at a certain air pressure, a certain time is injected under the condition of the drying gas to the interior of the battery;

[13]

(4), solenoid valve is closed, at the same time internal pressure of the battery computer system collects data P1;

[14]

(5), maintaining the pressure for a time, the computer system once again by the sensor data collection cell internal pressure P2;

[15]

(6), the computer, through pressure change value large and small judging the battery leakage;

[16]

(7), measured drain syringe uplink reset, reset push plate, leakage of the battery is taken out, the normal circulation of qualified at the same time to the next step of the battery.

[17]

The air pressure source start, internal to the battery into the drying gas, the drying gas is positive pressure gas, the air pressure of the positive-pressure air is 0.05 -0.2 MPa, in 5-10S injected the time of the drying gas to the interior of the battery.

[18]

The dwell time in 3-7S, the values on the change of the air pressure of 0.005 MPa   -0.01   MPa is not qualified to between.

[19]

The beneficial effect of the invention: provides a new measuring aluminum or steel shell encapsulated lithium ion battery shell body leakage method,   the positive pressure side leakage can be faster, more effectively the air leakage out of the battery the poor welding, to avoid the drawback of the negative pressure side, air leakage can be avoided, in particular, defective products of the produced very slowly.

[20]

Description of drawings

[21]

Figure 1 is a schematic diagram of one embodiment of the present invention leakage detection device the example measured.

[22]

Figure 2 is a schematic diagram of the invention the above-mentioned implementation work state the example measured drain device.

[23]

Mode of execution

[24]

A method for the testing of a lithium ion battery, which is characterized by comprising the following steps:

[25]

(1), taking a set of battery drain to be measured 3 placed in the leakage testing die 2 inner, die plate 4 in the cylinder 41 fixed locking the battery;

[26]

(2), cell rotary to leakage testing syringe 1 underface, then the downlink the battery the liquid sealing and leakage testing the syringe, as shown in Figure 2;

[27]

(3), pressure source start, to the battery positive pressure dry gas injected, air pressure in the 0.05-0.2 MPa between, the injection duration 5-10S;

[28]

(4), solenoid valve is closed, at the same time internal pressure of the battery computer system collects data P1 in 0.05-0.2 MPa between;

[29]

(5), the pressure maintaining time 3-7S, computer system once again by the sensor data collection cell internal air pressure P2, the internal pressure of the battery of 0.05-0.2 MPa between;

[30]

(6), the computer, through pressure change value large and small judging the battery leakage; in the 0.005-0.01   MPa to non-qualified;

[31]

(7), measured drain syringe uplink reset, reset push plate, leakage of the battery is taken out, the normal circulation of qualified at the same time to the next step of the battery.

[32]

The value of the size change of the air pressure when the solenoid valve is closed under a certain period of time and pressure test of the back of the pressure difference, the pressure difference reaches a certain difference in judging cell leakage, such as general mobile phone battery if the air pressure difference of 0.005-0.01   MPa is not qualified to between, air pressure is greater than 0.01 is qualified of   MPa.



[1]

The invention relates to a leakage detection method for lithium ion batteries. The method comprises the steps that (1) the batteries to be detected are placed in a leakage detection die; (2) batteries are rotated to position below leakage detection syringes, and the cylinders move downwardly so that liquid injection holes of the batteries are sealed with the leakage detection syringes; (3) an air pressure source is started to inject dry gas into the batteries under certain air pressure for certain time; (4) a solenoid valve is closed, and at the same time, a computer system collects the internal air pressure P1 of each battery; (5) the pressure is maintained for certain type, and the computer system collects the internal air pressure P2 of each battery for second time via a sensor; (6) a computer determines whether leakage occurs in the battery according the air pressure change value delta P=P1-P2; and (7) leakage detection syringes move upwardly to return to the original positions. The batteries in which leakage occurs due to defective welding can be found more rapidly and effectively by positive pressure leakage detection, the disadvantages of negative pressure leakage detection are avoided, and especially defective products caused by very slow air leakage can be avoided.

[1]



1. A method for the testing of a lithium ion battery, which is characterized by comprising the following steps:

(1), heating to be measured is put in the mould leaks the battery measuring leakage, the cylinder pushing plate for die fixed locking the battery;

(2), the battery to leak under the syringe, then the downlink the battery the liquid sealing and leakage testing syringe;

(3), pressure source start, at a certain air pressure, a certain time is injected under the condition of the drying gas to the interior of the battery;

(4), solenoid valve is closed, at the same time internal pressure of the battery computer system collects data P1;

(5), maintaining the pressure for a time, the computer system once again by the sensor data collection cell internal pressure P2;

(6), the computer, through pressure change value? P= (P1-P2) size judging the battery leakage;

(7), measured drain syringe uplink reset, reset push plate, leakage of the battery is taken out, the normal circulation of qualified at the same time to the next step of the battery.

2. A method for the testing of a lithium ion battery according to Claim 1, characterized in that air pressure source start, internal to the battery into the drying gas, the drying gas is positive pressure gas, the air pressure of the positive-pressure air is 0.05 -0.2 MPa, in 5-10S injected the time of the drying gas to the interior of the battery.

3. A method for the testing of a lithium ion battery according to Claim 1, characterized in that the dwell time in 3-7S, the pressure change value? In P 0.005 MPa   -0.01   MPa is not qualified to between.