阅读说明：本技术 热敏电阻失效电流的自动测试方法及装置 (Automatic testing method and device for thermistor failure current ) 是由 郁亮 吴江进 于 2020-04-13 设计创作，主要内容包括：本发明涉及测试技术领域,特别涉及一种热敏电阻失效电流的自动测试方法及装置。所述方法包括：以初始电流对测试系统中的热敏电阻进行通电测试；在第一预设时间内,检测所述热敏电阻是否失效；若否,则对所述热敏电阻断电；在第二预设时间后,以增加第一电流对所述热敏电阻进行通电测试；在第三预设时间内,检测所述热敏电阻是否失效；若否,则重复所述在第二预设时间后,以增加第一电流对所述热敏电阻进行通电测试的步骤,直至所述热敏电阻失效,记录失效电流。通过测试系统对热敏电阻进行自动测试,不断增加第一电流,直至热敏电阻失效,记录失效电流,解决人工手动测试热敏电阻失效电流,导致耗时长、浪费人力,且存在安全隐患的问题。(The invention relates to the technical field of testing, in particular to an automatic testing method and device for thermistor failure current. The method comprises the following steps: carrying out power-on test on a thermistor in the test system by using initial current; detecting whether the thermistor fails within a first preset time; if not, the thermistor is powered off; after a second preset time, increasing the first current to carry out a power-on test on the thermistor; detecting whether the thermistor fails within a third preset time; if not, repeating the step of increasing the first current to carry out the power-on test on the thermistor after the second preset time until the thermistor fails, and recording the failure current. The thermistor is automatically tested through the test system, the first current is continuously increased until the thermistor fails, the failure current is recorded, and the problems that manual testing of the thermistor failure current is long in time consumption, manpower is wasted, and potential safety hazards exist are solved.)

1. A method for automatically testing thermistor failure current, which is characterized by comprising the following steps:

carrying out power-on test on a thermistor in the test system by using initial current;

detecting whether the thermistor fails within a first preset time;

if not, the thermistor is powered off;

after a second preset time, increasing a first current on the basis of the previous electrifying test current to carry out electrifying test on the thermistor;

detecting whether the thermistor fails within a third preset time;

if not, repeating the step of increasing the first current to carry out the energization test on the thermistor on the basis of the previous energization test current after the second preset time until the thermistor fails, and recording the failure current.

2. The method for automatically testing the thermistor failure current according to claim 1, wherein the step of detecting whether the thermistor fails within a first preset time includes:

and if the thermistor fails, recording failure current.

3. The method for automatically testing the thermistor failure current according to claim 1, wherein the step of detecting whether the thermistor fails within a third preset time includes:

and if the thermistor fails, recording failure current.

4. The method of claim 1, wherein prior to the step of performing a power-on test of the thermistor in the test system at the initial current, the method further comprises:

detecting whether the test system works normally;

if so, the test is initiated.

5. The method for automatically testing the thermistor failure current according to claim 1, wherein the test system comprises a battery cell, a thermistor, a main battery circuit and a charging and discharging cabinet.

6. An apparatus for automatically testing a thermistor failure current, the apparatus comprising:

the first test module is used for carrying out power-on test on the thermistor in the test system by using initial current;

the first detection module is used for detecting whether the thermistor fails within first preset time;

the power-off module is used for powering off the thermistor if the thermistor is not powered off;

the second testing module is used for increasing the first current to carry out the power-on test on the thermistor on the basis of the previous power-on test current after a second preset time;

the second detection module is used for detecting whether the thermistor fails within third preset time;

and the first recording module is used for repeatedly triggering the second testing module if the thermistor fails, and recording the failure current.

7. The automatic thermistor failure current testing device according to claim 6, characterized in that the device comprises:

and the second recording module is used for recording failure current if the thermistor fails within the first preset time.

8. The automatic thermistor failure current testing device according to claim 6, characterized in that the device comprises:

and the third recording module is used for recording failure current if the thermistor fails within the third preset time.

9. The automatic thermistor failure current testing device according to claim 6, characterized in that the device comprises:

the third detection module is used for detecting whether the test system works normally or not;

and the starting module is used for starting the test if the test is true.

10. The automatic testing device for the thermistor failure current according to claim 6, wherein the testing system comprises a battery core, a thermistor, a main battery loop and a charging and discharging cabinet.

Technical Field

The invention relates to the technical field of testing, in particular to an automatic testing method and device for thermistor failure current.

Background

At present, when the thermistor of the lithium ion battery is verified to be invalid, manual testing is often performed by adopting a method of connecting a direct current power supply to two ends of the thermistor of the battery. The operation method has the defects of long time consumption, manpower waste and potential safety hazard.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an automatic testing method and device for thermistor failure current, aiming at solving the problems of long time consumption, manpower waste and potential safety hazard caused by manual testing of thermistor failure current.

The technical scheme provided by the invention is as follows:

a method for automatic testing of thermistor failure current, the method comprising:

carrying out power-on test on a thermistor in the test system by using initial current;

detecting whether the thermistor fails within a first preset time;

if not, the thermistor is powered off;

after a second preset time, increasing a first current on the basis of the previous electrifying test current to carry out electrifying test on the thermistor;

detecting whether the thermistor fails within a third preset time;

if not, repeating the step of increasing the first current to carry out the energization test on the thermistor on the basis of the previous energization test current after the second preset time until the thermistor fails, and recording the failure current.

Further, the step of detecting whether the thermistor fails within a first preset time includes:

and if the thermistor fails, recording failure current.

Further, the step of detecting whether the thermistor fails within a third preset time includes:

and if the thermistor fails, recording failure current.

Further, before the step of performing the power-on test of the thermistor in the test system with the initial current, the method comprises the following steps:

detecting whether the test system works normally;

if so, the test is initiated.

Furthermore, the test system comprises a battery core, a thermistor, a main battery circuit and a charging and discharging cabinet.

The invention also provides an automatic testing device for the failure current of the thermistor, which comprises:

the first test module is used for carrying out power-on test on the thermistor in the test system by using initial current;

the first detection module is used for detecting whether the thermistor fails within first preset time;

the power-off module is used for powering off the thermistor if the thermistor is not powered off;

the second testing module is used for increasing the first current to carry out the power-on test on the thermistor on the basis of the previous power-on test current after a second preset time;

the second detection module is used for detecting whether the thermistor fails within third preset time;

and the first recording module is used for repeatedly triggering the second testing module if the thermistor fails, and recording the failure current.

Further, the apparatus comprises:

and the second recording module is used for recording failure current if the thermistor fails within the first preset time.

Further, the apparatus comprises:

and the third recording module is used for recording failure current if the thermistor fails within the third preset time.

Further, the apparatus comprises:

the third detection module is used for detecting whether the test system works normally or not;

and the starting module is used for starting the test if the test is true.

Furthermore, the test system comprises a battery core, a thermistor, a main battery circuit and a charging and discharging cabinet.

According to the technical scheme, the invention has the beneficial effects that: the thermistor is automatically tested through the test system, the first current is continuously increased until the thermistor fails, the failure current is recorded, and the problems that manual testing of the thermistor failure current is long in time consumption, manpower is wasted, and potential safety hazards exist are solved.

Drawings

FIG. 1 is a flow chart of a method for automatically testing the failure current of a thermistor according to an embodiment of the present invention;

fig. 2 is a functional block diagram of an automatic testing device for thermistor failure current provided by an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, an embodiment of the present invention provides an automatic testing method for a thermistor failure current, including the following steps:

and step S101, carrying out power-on test on the thermistor in the test system by using the initial current.

After the test is started, the thermistor is tested at an initial current. In the present embodiment, the initial current is preset by the user, specifically, the initial current is 3.6A. Of course, in other embodiments, the initial current may be 3A, or 3.5A. In addition, the failure current of the thermistor generally has a range of values, and the user can select a current value smaller than the minimum value of the failure current range value when selecting the initial current according to the minimum value of the known range values.

And S102, detecting whether the thermistor fails within first preset time.

And testing the thermistor through the initial current, and continuously detecting whether the thermistor fails or not within a first preset time. In this embodiment, the first preset time is preset by a user, and specifically, the first preset time is 2 min.

And step S103, if not, powering off the thermistor.

If the thermistor is detected to be not failed, the test is passed, the initial current is not the failure current of the thermistor, and then the thermistor is powered off and is subjected to standing treatment.

And step S104, after a second preset time, increasing a first current on the basis of the previous electrifying test current to carry out electrifying test on the thermistor.

And after the thermistor is kept still for the second preset time, increasing the current to perform the power-on test on the thermistor again, wherein the increased current is the first current, namely, after the first current is increased on the basis of the initial current, performing the power-on test on the thermistor again. In this embodiment, the second preset time is preset by the user, and specifically, the second preset time is 5 min. The first current is preset by a user, and specifically, the first current is 0.2A.

And S105, detecting whether the thermistor fails within third preset time.

And after the current is increased to perform the electrifying test on the thermistor again, continuously detecting whether the thermistor fails or not within a third preset time.

In this embodiment, the third preset time is preset by the user, specifically, the first preset time is the same as the third preset time, and the third preset time is 2 min.

And S106, if not, repeating the step of increasing the first current to perform the energization test on the thermistor on the basis of the previous energization test current after the second preset time until the thermistor fails, and recording the failure current.

If the thermistor is detected to be not failed, the current test current is not the failure current of the thermistor, the step S104 is repeatedly executed until the thermistor fails, and the failure current is recorded and stored, wherein the failure current is the current test current of the thermistor.

In the present embodiment, after step S102, the method includes:

and if the thermistor fails, recording failure current.

If the thermistor fails, the test is not passed, the initial current is the failure current of the thermistor, the failure current is recorded, and the failure current is the initial current.

In the present embodiment, after step S105, the method includes:

and if the thermistor fails, recording failure current.

If the thermistor fails, the current test current is the failure current of the thermistor, the failure current is recorded and stored, and the failure current is the current test current of the thermistor.

In this embodiment, before step S101, the method includes:

detecting whether the test system works normally;

if so, the test is initiated.

Before starting the test, whether the test system works normally is detected, and if the test system works normally, the test is started.

In this embodiment, the test system includes a battery cell, a thermistor, a main battery circuit, and a charging/discharging cabinet. The battery main loop is respectively electrically connected with the battery core and the charging and discharging cabinet, the charging and discharging cabinet charges and discharges the battery core through the battery main loop, the charging and discharging cabinet can control and output currents with different numerical values, the thermistor is arranged between the battery core and the battery main loop, and when the thermistor fails, a circuit between the battery core and the battery main loop is disconnected. In this embodiment, the charging and discharging cabinet and the main battery circuit can be both the existing charging and discharging cabinet and the existing main battery circuit.

In this embodiment, step S102 includes:

detecting whether a main circuit of a battery in a test system is disconnected or not within a first preset time;

if yes, judging that the thermistor fails;

if not, the thermistor is judged not to be failed.

And judging whether the thermistor fails or not by judging whether the main circuit of the battery is broken or not.

In some embodiments, in step S102, the method includes:

detecting whether the thermal resistance is open circuit or not within a first preset time;

if yes, judging that the thermistor fails;

if not, the thermistor is judged not to be failed.

And judging whether the thermistor fails or not by judging whether the thermal resistor is disconnected or not.

In conclusion, the thermistor is automatically tested through the test system, the first current is continuously increased until the thermistor fails, the failure current is recorded, and the problems that manual testing of the thermistor failure current is long in time consumption, manpower is wasted, and potential safety hazards exist are solved.

As shown in fig. 2, an embodiment of the present invention provides an automatic testing apparatus 1 for a thermistor failure current, where the apparatus 1 includes a first testing module 11, a first detecting module 12, a power-off module 13, a second testing module 14, a second detecting module 15, and a first recording module 16.

The first test module 11 is used for performing power-on test on the thermistor in the test system by using initial current.

After the test is started, the thermistor is tested at an initial current. In the present embodiment, the initial current is preset by the user, specifically, the initial current is 3.6A. Of course, in other embodiments, the initial current may be 3A, or 3.5A. In addition, the failure current of the thermistor generally has a range of values, and the user can select a current value smaller than the minimum value of the failure current range value when selecting the initial current according to the minimum value of the known range values.

The first detection module 12 is configured to detect whether the thermistor fails within a first preset time.

And testing the thermistor through the initial current, and continuously detecting whether the thermistor fails or not within a first preset time. In this embodiment, the first preset time is preset by a user, and specifically, the first preset time is 2 min.

And the power-off module 13 is used for powering off the thermistor if the current is not detected.

If the thermistor is detected to be not failed, the test is passed, the initial current is not the failure current of the thermistor, and then the thermistor is powered off and is subjected to standing treatment.

And the second testing module 14 is used for increasing the first current on the basis of the previous electrifying testing current to carry out electrifying testing on the thermistor after a second preset time.

And after the thermistor is kept still for the second preset time, increasing the current to perform the power-on test on the thermistor again, wherein the increased current is the first current, namely, after the first current is increased on the basis of the initial current, performing the power-on test on the thermistor again. In this embodiment, the second preset time is preset by the user, and specifically, the second preset time is 5 min. The first current is preset by a user, and specifically, the first current is 0.2A.

And the second detection module 15 is used for detecting whether the thermistor fails within a third preset time.

And after the current is increased to perform the electrifying test on the thermistor again, continuously detecting whether the thermistor fails or not within a third preset time.

In this embodiment, the third preset time is preset by the user, specifically, the first preset time is the same as the third preset time, and the third preset time is 2 min.

And the first recording module 16 is used for repeatedly triggering the second testing module 14 if the thermistor is not in failure, and recording failure current.

If the thermistor is detected to be not failed, the current test current is not the failure current of the thermistor, the second test module 14 is triggered repeatedly until the thermistor fails, and the failure current is recorded and stored, wherein the failure current is the current test current of the thermistor.

In the present embodiment, the apparatus 1 comprises:

and the second recording module is used for recording failure current if the thermistor fails within the first preset time.

If the thermistor fails, the test is not passed, the initial current is the failure current of the thermistor, the failure current is recorded, and the failure current is the initial current.

In the present embodiment, the apparatus 1 comprises:

and the third recording module is used for recording failure current if the thermistor fails within the third preset time.

If the thermistor fails, the current test current is the failure current of the thermistor, the failure current is recorded and stored, and the failure current is the current test current of the thermistor.

In the present embodiment, the apparatus 1 comprises:

the third detection module is used for detecting whether the test system works normally or not;

and the starting module is used for starting the test if the test is true.

Before starting the test, whether the test system works normally is detected, and if the test system works normally, the test is started.

In this embodiment, the test system includes a battery cell, a thermistor, a main battery circuit, and a charging/discharging cabinet. The battery main loop is respectively electrically connected with the battery core and the charging and discharging cabinet, the charging and discharging cabinet charges and discharges the battery core through the battery main loop, the charging and discharging cabinet can control and output currents with different numerical values, the thermistor is arranged between the battery core and the battery main loop, and when the thermistor fails, a circuit between the battery core and the battery main loop is disconnected. In this embodiment, the charging and discharging cabinet and the main battery circuit can be both the existing charging and discharging cabinet and the existing main battery circuit.

In the present embodiment, the first detection module 12 includes:

the first sub-detection module is used for detecting whether a main circuit of the battery in the test system is open or not within first preset time;

the first sub-judgment module is used for judging that the thermistor fails if the first sub-judgment module is used for judging that the thermistor fails;

and the second sub-judgment module is used for judging that the thermistor does not fail if the judgment result is no.

And judging whether the thermistor fails or not by judging whether the main circuit of the battery is broken or not.

In some embodiments, the first detection module 12 includes:

the second sub-detection module is used for detecting whether the thermal resistance is open circuit or not within first preset time;

the third sub-judgment module is used for judging that the thermistor fails if the judgment result is positive;

and the fourth sub-judgment module is used for judging that the thermistor does not fail if the judgment result is no.

And judging whether the thermistor fails or not by judging whether the thermal resistor is disconnected or not.

In conclusion, the thermistor is automatically tested through the test system, the first current is continuously increased until the thermistor fails, the failure current is recorded, and the problems that manual testing of the thermistor failure current is long in time consumption, manpower is wasted, and potential safety hazards exist are solved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.