CN215219093U - Safety testing device for manufacturing and using lithium ion battery - Google Patents
Safety testing device for manufacturing and using lithium ion battery Download PDFInfo
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- CN215219093U CN215219093U CN202121615831.1U CN202121615831U CN215219093U CN 215219093 U CN215219093 U CN 215219093U CN 202121615831 U CN202121615831 U CN 202121615831U CN 215219093 U CN215219093 U CN 215219093U
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Abstract
The utility model provides a safety testing device for manufacturing and using a lithium ion battery, which comprises the lithium ion battery, wherein the positive electrode and the negative electrode of the lithium ion battery are connected with a charging and discharging device, an alternating current impedance instrument and a dynamic resistance instrument, and the alternating current impedance instrument and the dynamic resistance instrument are respectively and electrically connected with the charging and discharging device through a sensor; the thermal imager, the thickness morphology tester and the gas detector are arranged on the charging and discharging equipment in a sliding manner and are respectively and electrically connected with the charging and discharging equipment through sensors; the safety testing device can perform nondestructive safety detection on the lithium ion battery, and the testing items comprise thickness, alternating current impedance, dynamic resistance, battery temperature distribution, electrolyte steam concentration and the like, so that the comprehensive detection of the lithium ion battery is realized, the safety detection efficiency and accuracy of the lithium ion battery are improved, and the safety accidents such as fire and the like caused by battery safety defects in the conventional formation and capacity testing procedures are effectively avoided.
Description
Technical Field
The utility model relates to a lithium ion battery testing arrangement field especially relates to a safety test device that lithium ion battery made and used.
Background
Lithium ion batteries are widely used as important chemical batteries in the power fields of portable small-sized electrical appliances such as mobile phones and digital cameras, electric bicycles and electric automobiles and the power fields of aviation, aerospace and submarines. Compared with other types of rechargeable batteries, the lithium ion battery has the advantages of high specific energy, high voltage, no memory effect, long charging and discharging service life, quick charging and discharging, low self-discharging rate, small environmental pollution and the like, and the application range of the lithium ion battery is wider and wider. Besides normal charge-discharge reactions, some side reactions of the lithium ion battery mostly generate heat. When the rate of heat generation is higher than the rate of heat dissipation, the temperature of the battery rises, and more heat and gas products are produced, at which time the battery enters an uncontrolled self-warming state, resulting in combustion, even explosion, of the battery, a phenomenon known as thermal runaway. At present, most of combustion explosion accidents of lithium ion batteries are caused by thermal runaway.
In the new energy lithium ion battery industry, the formation and capacity grading process refers to the charge and discharge test of the finished battery by using special battery charge and discharge equipment. The working procedures comprise repeated charge and discharge (1-3 times), storage and the like, and fire is easily caused.
The fire risk in the chemical component content process is as follows:
(1) if unqualified products appear in the production process of the lithium ion battery, if the electrode lug of the battery cell is too long, the electrode lug is in contact with the pole piece or the shell and is easy to cause internal short circuit, or the electrode lug presses the winding core, so that the anode and the cathode are in short circuit. If an internal short circuit occurs during the charge and discharge of the chemical component, thermal runaway may occur, resulting in a fire.
(2) When the battery is assembled, metal powder, copper foil and aluminum foil fragments are left between two electrodes, and the risk of inner short circuit caused by penetrating through a diaphragm exists. If an internal short circuit occurs in the chemical composition/capacity conversion process, thermal runaway may occur, resulting in a fire.
(3) When the battery is formed into a component capacity, if the charging voltage exceeds the design pressure, the temperature of the battery cell body is continuously increased to cause thermal runaway, and smoke and fire can be caused to cause fire.
(4) The battery capacity is big, and internal resistance is low, passes through big electric current during the external short circuit, and the battery is inside to reach the state of thermal runaway, also has the risk of smoking and catching fire, conflagration.
(5) After thermal runaway occurs in the chemical composition and volume separation process, if the thermal runaway is not timely treated, electrolyte in the battery is volatilized due to high temperature, the volume of the storage position of the equipment is small, and due to the fact that a plurality of batteries exist, an environment causing explosion is easily formed, and fire and explosion accidents are caused.
(6) The chemical composition and partial volume place is provided with a plurality of devices and a large number of batteries, and abnormal batteries can be burnt by the spontaneous combustion and the combustion of the large number of batteries, if the fire is not extinguished in time or the smoke is exhausted badly, a large fire and even explosion accidents can be caused.
(7) The formation and partial capacity are completed in relatively closed equipment, the operation space of a formation workshop is limited, the fire development is very rapid after the battery is on fire, and a factory building fire-fighting system and human fire-fighting intervention are difficult to play a role in the first time, so that the fire is easily expanded.
Therefore, a safety testing device for manufacturing and using the lithium ion battery is additionally arranged on formation and capacity testing equipment, nondestructive safety detection is carried out on the battery, the defective battery is selected, early warning or production stopping is carried out before the defective battery burns, the occurrence of fire accidents can be reduced, and the product quality can be effectively guaranteed.
At present, the safety test of the lithium ion battery adopts independent battery safety test equipment to carry out performance detection on the battery item by item, the detection mode causes extremely low battery detection efficiency and low test accuracy, and accidents such as fire, explosion and the like easily occur in the test process, so that property loss and casualties are caused.
Therefore, a safety testing device for manufacturing and using a lithium ion battery is needed to solve the problems of low efficiency, poor accuracy, easy occurrence of safety accidents and the like in the conventional safety testing of the lithium ion battery.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a safety test device that lithium ion battery made and used to solve above-mentioned current lithium ion battery safety test existence inefficiency, accuracy difference and take place incident scheduling problem easily.
In order to achieve the above object, the utility model provides a following scheme:
the utility model provides a safety testing device for manufacturing and using a lithium ion battery, which comprises the lithium ion battery, wherein the positive electrode and the negative electrode of the lithium ion battery are connected with a charging and discharging device, and the charging and discharging device charges and discharges the lithium ion battery;
the positive electrode and the negative electrode of the lithium ion battery are also connected with an alternating current impedance instrument, and the alternating current impedance instrument is electrically connected with the charging and discharging equipment through a sensor;
the positive electrode and the negative electrode of the lithium ion battery are also connected with a dynamic resistance meter, and the dynamic resistance meter is electrically connected with the charging and discharging equipment through a sensor;
the charging and discharging equipment is connected with a thermal imager guide rail, a thermal imager is slidably arranged on the thermal imager guide rail, and the thermal imager is electrically connected with the charging and discharging equipment through a sensor;
the charging and discharging equipment is also connected with a thickness appearance tester guide rail, the thickness appearance tester is slidably arranged on the thickness appearance tester guide rail, and the thickness appearance tester is electrically connected with the charging and discharging equipment through a sensor;
the charging and discharging equipment is further connected with a gas detector guide rail, a gas detector is arranged on the gas detector guide rail in a sliding mode, and the gas detector is electrically connected with the charging and discharging equipment through a sensor.
Preferably, the charging and discharging equipment adopts formation equipment or capacity testing equipment.
Preferably, each layer or each row of the charging and discharging equipment is provided with a thermal imager, a thickness morphology tester and a gas detector.
Preferably, the thickness profile tester adopts a non-contact thickness profile tester or an intelligent image thickness profile tester.
Preferably, the gas detector is an electrolyte vapor detector or a hydrocarbon gas detector.
The utility model discloses following beneficial technological effect has been gained for prior art:
the utility model provides a safety testing device for manufacturing and using lithium ion batteries, which comprises a lithium ion battery, wherein the positive electrode and the negative electrode of the lithium ion battery are connected with a charging and discharging device, an alternating current impedance instrument and a dynamic resistance instrument, and the alternating current impedance instrument and the dynamic resistance instrument are respectively and electrically connected with the charging and discharging device through a sensor; the thermal imager, the thickness morphology tester and the gas detector are arranged on the charging and discharging equipment in a sliding manner and are respectively and electrically connected with the charging and discharging equipment through sensors; the safety testing device can perform nondestructive safety detection on the lithium ion battery, and the testing items comprise thickness, alternating current impedance, dynamic resistance, battery temperature distribution, electrolyte steam concentration and the like, so that the comprehensive detection of the lithium ion battery is realized, the safety detection efficiency and accuracy of the lithium ion battery are improved, and the safety accidents such as fire and the like caused by battery safety defects in the conventional formation and capacity testing procedures are effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a safety testing device for manufacturing and using a lithium ion battery provided by the present invention;
in the figure: 1: lithium ion battery, 2: charging and discharging equipment, 3: alternating current impedance meter, 4: dynamic resistance meter, 5: thermal imager guide rail, 6: thermal imager, 7: thickness appearance tester guide rail, 8: thickness profile tester, 9: gas detector guide rail, 10: a gas detector.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a safety test device that lithium ion battery made and used to there is inefficiency, poor and the incident scheduling problem takes place easily in the current lithium ion battery safety test of solution.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Example 1:
the present embodiment provides a safety testing apparatus for manufacturing and using a lithium ion battery, as shown in fig. 1, the safety testing apparatus includes a lithium ion battery 1, a positive electrode and a negative electrode of the lithium ion battery 1 are connected with a charging and discharging device 2, and the charging and discharging device 2 charges and discharges the lithium ion battery 1;
the positive and negative electrodes of the lithium ion battery 1 are also connected with an alternating current impedance instrument 3, the alternating current impedance value of the lithium ion battery 1 is tested at a specific test point, and the alternating current impedance value is used for judging whether the connection point of the lithium ion battery 1 is normal or loose, the risk of heating and ignition of a large resistor, the polarization phenomenon of various materials, the infiltration degree of electrolyte and the safety defect; the alternating current impedance instrument 3 is electrically connected with the charging and discharging equipment 2 through a sensor, the alternating current impedance instrument 3 can synchronously acquire current and voltage values of the charging and discharging equipment 2, and the alternating current impedance instrument 3 can test at specific voltage or time;
the anode and the cathode of the lithium ion battery 1 are also connected with a dynamic resistance meter 4, the lithium ion battery 1 is subjected to dynamic resistance test at a specific test point, and the polarization and the safety defects of the material are judged by the dynamic resistance; the dynamic resistance instrument 4 is electrically connected with the charging and discharging equipment 2 through a sensor, the dynamic resistance instrument 4 can synchronously acquire current and voltage values of the charging and discharging equipment 2, and the dynamic resistance instrument 4 can test at specific voltage or time;
the charging and discharging equipment 2 is connected with a thermal imager guide rail 5, a thermal imager 6 is slidably arranged on the thermal imager guide rail 5, and the thermal imagers 6 are distributed to distinguish local high-temperature abnormal points and identify individual abnormal lithium ion batteries 1; the thermal imager 6 is electrically connected with the charging and discharging equipment 2 through a sensor, the thermal imager 6 can synchronously acquire current and voltage values of the charging and discharging equipment 2, and can test the temperature of the battery at specific voltage or time;
the charging and discharging equipment 2 is also connected with a thickness appearance tester guide rail 7, a thickness appearance tester 8 is slidably arranged on the thickness appearance tester guide rail 7, and the thickness appearance tester 8 tests the thickness and appearance and is used for judging the battery flatulence and local short circuit; the thickness morphology tester 8 is electrically connected with the charging and discharging equipment 2 through a sensor, the thickness morphology tester 8 can synchronously acquire current and voltage values of the charging and discharging equipment 2 and can test the morphology and the thickness of the battery at specific voltage or time;
the charging and discharging equipment 2 is also connected with a gas detector guide rail 9, a gas detector 10 is arranged on the gas detector guide rail 9 in a sliding manner, and the gas detector 10 judges the damage and leakage defects of the battery and the like through the concentration of electrolyte steam or hydrocarbon gas; the gas detector 10 is electrically connected with the charging and discharging equipment 2 through a sensor, the gas detector 10 can synchronously acquire current and voltage values of the charging and discharging equipment 2, and can test the concentration of electrolyte vapor or hydrocarbon gas in a battery area at specific voltage or time so as to search abnormal values.
Specifically, the charging and discharging device 2 employs a formation device or a capacity test device.
Further, each layer or each row of the charging and discharging device 2 is provided with a thermal imager 6, a thickness morphology tester 8 and a gas detector 10.
Further, the thickness profile tester 8 adopts a non-contact thickness profile tester or an intelligent image thickness profile tester.
Further, the gas detector 10 employs an electrolyte vapor detector or a hydrocarbon gas detector.
The utility model provides a pair of safety test device that lithium ion battery made and used, exchange impedance appearance 3, dynamic resistance appearance 4, thermal imager 6, thickness appearance tester 8, gas detector 10 all embeds software, and the software all has data acquisition, and functions such as data processing, data analysis, system mark carry out safe healthy grading to the battery according to data, to unusual battery system mark to send to charging and discharging equipment 2 and stop the charge-discharge instruction, realize unusual battery interception.
The alternating current impedance instrument 3, the dynamic resistance instrument 4, the thermal imager 6, the thickness and appearance tester 8 and the gas detector 10 only need to perform safety detection at specific test points, and the cost of test resources is reduced. The formation process test points comprise a voltage platform (such as a 1.5V iron impurity platform) which is not formed and stands for a plurality of times after the electrolyte is injected, a voltage platform which is formed by small current and is sensitive to specific impurities (such as a 1.5V iron impurity platform), a voltage platform which is formed by small current and is just finished when a large amount of gas is produced (about 2.8V voltage), a voltage platform which is charged by large current and constant current to specific voltage (such as a characteristic voltage value of expansion and phase change of a positive electrode material and a negative electrode material), a voltage value which is charged by variable current and constant voltage to a set high voltage value, a voltage value which is discharged by large current and is sensitive to a set low voltage value or a specific material sensitive voltage value, a voltage value which is discharged by variable current and constant voltage to a set low voltage value, and the like. The capacity test procedure test points comprise constant-current constant-voltage charging to a set full-current voltage value, small-current discharging to a set low-voltage value or a specific material sensitive voltage value, small-current constant-current charging to a specific voltage platform (such as a characteristic voltage value of expansion phase change of a positive electrode material and a negative electrode material) and the like.
The utility model provides a pair of safety test device that lithium ion battery made and used still can be integrated to power battery module, power battery electronic box after the miniaturation on, use along with power battery, perhaps select specific time to carry out safety inspection at any time, detect in advance or predict battery abnormal point, avoid the battery module burning.
The utility model discloses the principle and the implementation mode of the utility model are explained by applying the concrete examples, and the explanation of the above examples is only used for helping to understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present description should not be construed as a limitation of the present invention.
Claims (5)
1. A safety test device for manufacturing and using a lithium ion battery comprises the lithium ion battery, and is characterized in that: the positive electrode and the negative electrode of the lithium ion battery are connected with charge and discharge equipment, and the charge and discharge equipment is used for charging and discharging the lithium ion battery;
the positive electrode and the negative electrode of the lithium ion battery are also connected with an alternating current impedance instrument, and the alternating current impedance instrument is electrically connected with the charging and discharging equipment through a sensor;
the positive electrode and the negative electrode of the lithium ion battery are also connected with a dynamic resistance meter, and the dynamic resistance meter is electrically connected with the charging and discharging equipment through a sensor;
the charging and discharging equipment is connected with a thermal imager guide rail, a thermal imager is slidably arranged on the thermal imager guide rail, and the thermal imager is electrically connected with the charging and discharging equipment through a sensor;
the charging and discharging equipment is also connected with a thickness appearance tester guide rail, the thickness appearance tester is slidably arranged on the thickness appearance tester guide rail, and the thickness appearance tester is electrically connected with the charging and discharging equipment through a sensor;
the charging and discharging equipment is further connected with a gas detector guide rail, a gas detector is arranged on the gas detector guide rail in a sliding mode, and the gas detector is electrically connected with the charging and discharging equipment through a sensor.
2. A safety test device for the manufacture and use of lithium ion batteries according to claim 1, characterized in that: and the charging and discharging equipment adopts formation equipment or capacity testing equipment.
3. A safety test device for the manufacture and use of lithium ion batteries according to claim 1, characterized in that: and each layer or each row of the charging and discharging equipment is provided with a thermal imager, a thickness appearance tester and a gas detector.
4. A safety test device for the manufacture and use of lithium ion batteries according to claim 1, characterized in that: the thickness appearance tester adopts non-contact thickness appearance tester or intelligent image thickness appearance tester.
5. A safety test device for the manufacture and use of lithium ion batteries according to claim 1, characterized in that: the gas detector adopts an electrolyte vapor detector or a hydrocarbon gas detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121615831.1U CN215219093U (en) | 2021-07-15 | 2021-07-15 | Safety testing device for manufacturing and using lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121615831.1U CN215219093U (en) | 2021-07-15 | 2021-07-15 | Safety testing device for manufacturing and using lithium ion battery |
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| CN215219093U true CN215219093U (en) | 2021-12-17 |
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| CN202121615831.1U Active CN215219093U (en) | 2021-07-15 | 2021-07-15 | Safety testing device for manufacturing and using lithium ion battery |
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