Lithium ion battery test equipment method

Lithium-ion battery test equipment solution application profile Li-ion battery has many advantages compared with other chemical batteries. For example, lithium-ion batteries are lighter, have no memory effect, and self-discharge slower than nickel-metal hydride batteries or nickel-cadmium batteries. Lithium-ion batteries have been widely used as rechargeable batteries for modern electronic devices such as smart phones and notebook computers. Due to the demand for clean energy, lithium-ion batteries have recently become popular in high-power applications such as electric vehicles, power tools, and energy storage. With the rapid development of lithium-ion batteries, test equipment used in the manufacturing process has become very important. The typical functions of Li-ion battery test equipment are formed and graded as shown in the figure below: After the battery is assembled, each battery must undergo at least one precisely controlled charge and discharge cycle to activate the working material and convert it into a usable form. Battery suppliers can also use this process to sell batteries in different performance groups based on optional specifications (called sizes). Cycle and characteristic test: Cycle is the repeated charging and discharging of battery cells and battery packs for life and reliability testing. Characterization refers to the detailed measurement of the technical characteristics of the battery. Usually, both of these tests take a long time, usually more than a day, and only test selected battery samples in the laboratory. Functional test: The functional test of each battery must be carried out after production to ensure that each battery and battery pack can work normally before being delivered to the end customer. In order to reduce the test time, the functional test is a simplified test that only contains the necessary items. System design considerations and key challenges Test time is an important factor in determining the output of lithium-ion batteries. The general conversion time of lithium-ion batteries is 2-5 hours, which cannot be compressed due to the material characteristics inside the battery. In order to test multiple batteries at the same time to increase the output, the lithium-ion battery tester has a large number of channels, up to 1024 channels or more. In addition, the greater the capacity of the lithium-ion battery, the greater the charging current required. This means that the power consumption of the lithium-ion battery test system may be very high, so the first challenge faced by the lithium-ion battery test system is to improve energy efficiency. In recent years, more and more switch testers have achieved higher test efficiency than traditional linear testers. In addition, advanced battery testing equipment also implements energy recovery technology. The second challenge for lithium-ion battery testing is to more accurately control the charge and discharge cycle. In order to shorten the charging time, most users first choose the constant current (CC) charging mode, and then switch to the constant voltage (CV) charging mode. This requires precise control of the conversion between constant current mode and constant voltage mode to prevent overcharging (overcharging). In addition, the heat generated by the energy loss can cause drift, which affects the accuracy and safety of the system. The third challenge faced by lithium-ion battery testers is to reduce test costs and compete with other types of batteries. In addition to the cost of the tester itself, test time and energy consumption are also an important part of the test cost. Designers of lithium-ion battery testers need to use some advanced topologies and technologies to reduce costs without affecting the accuracy of the test. Battery temperature exceeding the rated value during charging or discharging may shorten battery life. In the worst case, the high temperature can cause the battery to burst or even catch fire. Therefore, it is necessary to monitor the temperature during charging and discharging of lithium-ion batteries. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.