Our Laboratory
Materials Analysis Laboratory
1. Introduction to the laboratory:
The material analysis laboratory mainly includes automatic potentiometric titrator, inductively coupled plasma emission spectrometer and other equipment and instruments.
2. Main analysis items:
The material analysis laboratory is mainly used for qualitative, semi-quantitative and quantitative analysis of major and trace elements in various materials of lithium batteries.
3. The main technical parameters of the equipment:
Analysis speed: ≥70 elements or spectral lines per minute;
Sample consumption: < 2ml, determination of more than 70 elements;
The linear dynamic range of the measured spectral line: ≥106;
Precision: RSD≤0.5% for ten repeated determinations;
Stability: The long-term stability RSD < 1.0% for continuous measurement of 4 hours;
Detection limit: (Zn) <0.20ug/L
Materials Physics and Chemistry Laboratory
The material physical and chemical laboratory is mainly a place for analyzing and testing material density, hardness and other physical and chemical indicators. The laboratory mainly includes equipment such as tap density meter, compaction density meter, moisture tester, tensile tester, and laser particle size analyzer.
2. Main analysis items:
The material physical and chemical laboratory is mainly used in the analysis of density, porosity, particle size, moisture, etc. of various materials of lithium batteries.
3. The main technical parameters of the equipment:
Reproducibility better than 1%
Measuring range 0.01~3500 μ m
Resolution better than 0.01 μm
Performance Testing Laboratory
1. The purpose of the experiment:
Lithium battery performance test is based on national standard requirements, used for battery pack performance test.
2. Standard test requirements:
a. The test object is the battery system.
b. All control systems in the test object should be in working condition during the test;
c. The discharge current rate is 1C or determined through negotiation between the two parties, until the battery management system works, or the test is stopped when the required conditions are met; after the test, observe for 2 hours.
d. The charging current rate is 1C or determined by both parties through negotiation. Charge until the battery management system works, or stop the test when the required conditions are met: After the test, observe for 2 hours.
f. Experimental requirements: The actual test results shall prevail.
Soaking laboratory
1. The purpose of the experiment:
The seawater immersion test of lithium batteries is based on the requirements in the standard (GB/T 38031-2020 Safety Requirements for Traction Batteries for Electric Vehicles), and is used for the safety test of seawater immersion resistance of electric vehicle power batteries.
2. Standard test requirements:
(1) The test object is battery pack or system.
(2) The test object is connected to the wiring harness, connectors and other parts according to the connection method of the whole vehicle, and one of the following two methods is selected for the test:
a) Method 1: The test object is placed in a 3.5% (mass fraction) sodium chloride solution for 2 hours in the assembly direction of the actual vehicle, and the water depth should be sufficient to submerge the test object;
b) Method 2: The test subjects shall be tested according to the method and procedure described in 14.2.7 of GB/T4208 2017. The test object is fully immersed in water according to the installation state specified by the manufacturer. For test objects with a height less than 850mm, the lowest point should be 1000mm below the water surface; for test objects with a height equal to or greater than 850mm, the highest point should be 150mm below the water surface. The test duration is 30min. The difference between the water temperature and the temperature of the test object is not more than 5 mm.
Take the battery pack out of the water, and observe it for 2 hours at the test environment temperature.
(3) Test requirements: The water immersion test of the battery pack or system shall meet one of the following requirements:
a) According to method 1, there should be no fire or explosion;
b) Carry out according to method 2. After the test, it must meet the requirements of IPX7, and there should be no leakage, shell rupture, fire or explosion. The insulation resistance after the test should not be less than 100Q/V.
IP protection laboratory
1. The purpose of the experiment:
Lithium battery IP protection test is based on (GB 4208 -2017 enclosure protection level (IP code)) standard requirements, and is used for dustproof and waterproof protection level testing of battery packs.
2. Standard test requirements:
(1) The test object is battery pack or system.
(2) Refer to Table 7 "Test Methods for Preventing Entry of Solid Foreign Objects" in Chapter 13.1 and Table 8 "Waterproof Test Methods and Main Test Conditions" in Chapter 14.1 of the GB4208-2017 Enclosure Protection Level (IP Code) Standard.
(3) Experimental requirements: calibrate the corresponding IP protection level according to the actual test situation.
3. The main technical parameters of the equipment:
P5X-6X dustproof test device
(1), Dust amount: 2-4kg/m3;
(2), air velocity: <2m/s;
(3) The pressure of the exhaust system: the vacuum degree does not exceed 200kpa;
(4) Structure: fully enclosed structure, the powerful motor circulates the indoor air to drive the dust to suspend;
(5) Vacuum system configuration: vacuum generator, flow meter, vacuum gauge, overspeed device.
Fire laboratory
1. The purpose of the experiment:
The lithium battery fire test is based on the requirements in the standard (GB/T 38031-2020 Safety Requirements for Traction Batteries for Electric Vehicles), and is used for the external fire safety test of the battery system.
2. Standard test requirements:
(1). The test object is battery pack or system.
(2). The body structure that protects the battery pack or system can participate in the fire test. The test environment temperature is above 0C, and the wind speed is not greater than 2.5km/h.
During the test, the size of the flat plate containing gasoline exceeds the horizontal projection size of the test object by 20cm, but does not exceed 50cm. The height of the flat plate is not higher than 8cm above the gasoline surface. The test object should be centered. The distance between the gasoline liquid level and the bottom of the test object is set to 50cm, or the height from the ground of the bottom of the test object when the vehicle is unloaded. Fill the bottom of the pan with water. The external fire test is divided into the following four stages:
a) Preheating. Ignite gasoline at a place at least 3m away from the test object, and after 60s of preheating, place the oil pan under the test object. If the size of the oil pan is too large to move, the test object and support can be moved.
b) direct combustion. The test subjects were directly exposed to flames for 70 seconds.
c) Indirect combustion. Place a refractory divider over the oil pan. The test subjects were tested in this state for 60s. Or continue to be directly exposed to the flame for 60 seconds after mutual agreement. The refractory partition is made of standard refractory bricks, and can also be made with refractory materials with reference to this size.
d) Move away from fire. Remove the oil pan or the test object, and observe at the test environment temperature for 2 hours or the surface temperature of the test object drops below 45C.
3. Experimental requirements: There is no explosion phenomenon in the battery pack or system. If there is a flame, it should be extinguished within 2 minutes after the fire source is removed.
Extrusion Laboratory
1. The purpose of the experiment:
The lithium battery extrusion test is based on the requirements in the standard (GB/T 38031-2020 Safety Requirements for Traction Batteries for Electric Vehicles), and is used for battery pack or system extrusion safety testing.
2. Standard test requirements:
(1) The test object is battery pack or system.
(2) Carry out the test according to the following conditions:
a) Form of extruded plate (choose one of the following two extruded plates):
- a semi-cylindrical body with a radius of 75mm for the extruded plate, the length (L) of the semi-cylindrical body is greater than the height of the test object, but not more than 1m;
——The size of the extruded plate is 600mmX600mm (length X width) or smaller, the radius of the three half cylinders is 75mm, and the distance between the half cylinders is 30mm;
b) Extrusion direction: z direction and v direction (the driving direction of the car is the x-axis direction, and the other horizontal direction perpendicular to the driving direction is the v-axis direction). In order to protect the safety of the test operation, it can be performed separately on two test objects test;
c) Extrusion speed: no more than 2mm/s;
d) Extrusion degree: Stop extrusion when the extrusion force reaches 100KN or the extrusion deformation reaches 30% of the overall size of the extrusion direction;
e) Hold for 10 minutes.
After completing the above test steps, observe at the test environment temperature for 2 hours.
Experimental requirements: There is no fire or explosion in the battery pack or system.
High and low-temperature laboratory
1. Introduction to the laboratory:
The high and low temperature testing room mainly includes a constant temperature and humidity test box (Programmable temperature and humidity tester), a precision high temperature oven and other equipment and instruments. High and low temperature testing is a method used to determine the storage, transportation, use and adaptability of products in high or low temperature climates. The severity of the test depends on the temperature and duration of exposure to high or low temperatures.
2. Main test items:
(1), non-heat dissipation samples and heat dissipation samples;
(2), high temperature humidity test and high temperature drying test;
(3), temperature mutation test and temperature gradient test;
(4), no forced air circulation test and forced air circulation test;
3. The main technical parameters of the equipment:
Temperature range: -50℃-180℃
Temperature control accuracy: 0.1C
Humidity range: 20-98%RH
Temperature tolerance range: ±2°C
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