Newly produced lithium batteries need to undergo a series of rigorous tests to ensure their performance, safety and reliability. The following is a detailed summary of these tests: 1. Physical property test Dimension and weight test: measure the size and weight of the battery to ensure that they meet the design requirements. Appearance inspection: check whether the battery shell, poles, labels, etc. are defective or damaged. Shell strength test: test the strength and durability of the battery shell by applying pressure or squeezing force. 2. Electrical performance test Capacity test: through specific charging and discharging equipment, charge and discharge operations are performed according to the set current and time to measure whether the amount of electricity discharged by the battery reaches the nominal capacity. Internal resistance test: use a professional internal resistance tester to measure the internal resistance value of the battery in different states (such as charging, discharging, and static). The internal resistance reflects the resistance inside the battery and has an important impact on the battery's power output, charging efficiency, and self-discharge performance. Voltage test: includes the measurement of open circuit voltage and operating voltage. The open circuit voltage refers to the terminal voltage of the battery when it is not connected to the load, and the operating voltage is the actual output voltage of the battery under load. Testing the voltage changes under different conditions can evaluate the performance stability of the battery and the degree of matching with the equipment. Rate performance test: Test the performance of the battery at different charge and discharge rates. The higher the rate, the greater the charge and discharge current. For example, test the capacity, internal resistance, voltage and other parameters of the battery at different rates such as 0.5C, 1C, and 2C to understand the performance changes of the battery during rapid charge and discharge, and whether it can meet the needs of high-power application scenarios. Self-discharge test: Measure the rate at which the battery discharges naturally when it is stationary. The lower the self-discharge rate, the better the storage performance of the battery. Discharge characteristic test: Including the discharge curve and discharge efficiency of the battery. 3. Safety test (needs to be carried out in special test institutions, which usually have professional test equipment and technicians to ensure the accuracy and reliability of the test, and provide detailed test reports and certification) Overcharge test: Simulate the performance of the battery under overcharge, and check whether the battery has a safety protection mechanism, such as whether the overcharge protection circuit will be triggered, whether the battery will heat up, swell, or even catch fire and explode. Over-discharge test: Check the safety of the battery during over-discharge. Excessive discharge may cause irreversible damage to the battery and reduce the battery life. Short circuit test: artificially create a short circuit between the positive and negative electrodes of the battery to observe whether the short circuit protection function of the battery is effective, as well as the temperature changes of the battery during short circuit, whether it will smoke and catch fire, etc. Needle puncture test: pierce the battery with a sharp object (such as a steel needle) to simulate the situation when the battery is punctured by a sharp object, and check whether the battery will undergo violent chemical reactions, catch fire or even explode. Extrusion test: place the battery in an extrusion device and apply a certain pressure to test the safety and stability of the battery when it is squeezed by external force. Heavy object impact test: apply instantaneous impact force to the battery to test the safety and stability of the battery when it is impacted by external force. Thermal stability test: place the battery in different temperature environments (such as high temperature and low temperature) to observe the performance changes of the battery and whether thermal runaway and other problems will occur. IV. Environmental adaptability test Temperature cycle test: cycle the battery multiple times in different temperature ranges, such as from low temperature to high temperature and then back to low temperature, to detect the performance stability and reliability of the battery during temperature changes. Humidity test: For lithium batteries that may be used in humid environments, such as batteries for outdoor equipment, humidity tests are required to evaluate their performance and reliability in high humidity environments. Vibration test: simulates the vibration that the battery may be subjected to during transportation and use, and tests the structural strength and connection reliability of the battery. Low pressure test: simulates the use of the battery in a high altitude or low pressure environment, and checks whether the battery leaks or bulges. V. Other tests Electromagnetic compatibility (EMC) test: evaluates the interference and anti-interference capabilities of the battery in an electromagnetic environment. Environmental performance test: detects the content of heavy metals and harmful substances in the battery to ensure that it meets environmental protection requirements. Cycle life test: observes the capacity decay of the battery by performing multiple charge and discharge cycles to evaluate the battery life. In summary, newly produced lithium batteries need to undergo a series of comprehensive and rigorous tests to ensure their performance, safety and reliability. These tests cover physical properties, electrical properties, safety, environmental adaptability and many other aspects, providing strong guarantees for battery quality control and subsequent applications.