Understand battery condition and maintenance methods
Battery is a more traditional energy storage battery. According to the positive electrode material, it can be divided into the following categories: lead-acid batteries, nickel-metal hydride batteries, nickel-cadmium batteries, nickel-zinc batteries, and lithium batteries. With the development of technology to this day, lithium-ion batteries using lithium iron phosphate as the cathode material represent the most advanced power batteries that can be used in high-power applications.
From the user's point of view, the purpose of battery testing is to determine the battery's state of health (SOH) and state of charge (SOC) to determine whether the battery needs to be replaced, and the battery The purpose of testing is to determine whether the battery needs to be charged. I think this is the core of battery maintenance testing. For more than ten years, the domestic and foreign industries have been trying to find a suitable detection method for users, in an engineering environment, rather than in a laboratory. At present, the maintenance detection method with internal resistance test as the core has been widely used at home and abroad.
1. Correctly understand the standard value of internal resistance.
A battery model, its initial internal resistance is determined, you can measure the initial internal resistance value with a battery condition tester, and then affix a label to the battery. 'The battery condition tester of the battery company corrects the initial internal resistance value according to the battery's life, state of charge and temperature during the test for comparison. When the internal resistance test value is higher than 40% of the initial value, it can be obtained The conclusion that the battery has been damaged or will soon deteriorate. In fact, the internal resistance of the damaged battery is far more than 40%, usually more than twice the original.
2. Correctly understand the inherent capacity and maintain Capacity and charging status.
Intrinsic capacity is the maximum amount of energy the battery can store.
Reserved capacity is the energy value that the battery can provide under current conditions.
The state of charge refers to how little energy the battery actually accepts.
The reduction in the battery’s inherent capacity and insufficient charging will result in a reduction in the reserved capacity.
Holding capacity is ours Really care about the value.
The evaluation of retention capacity is very complicated, and retention capacity is actually just a vague concept, because people are talking about it.
1, battery The advantages are:
1) High cell voltage, high energy density, appropriate weight and volume can bring greater energy output.
2) At rated charge and discharge rate, The use times and cycle life are longer.
3) The use of harmless and environmentally friendly materials, the environmental pollution is very low.
The disadvantages are:
1) Large The current charging and discharging characteristics are not ideal.
2) Poor tolerance to overcharge and overdischarge, requires a careful management and protection system.
3) The performance is greatly affected by temperature, and performance deteriorates at high temperatures And directly affect the capacity of the lithium battery pack.
4) There is a risk of explosion, such as high temperature, high current, etc.. Multiple protection mechanisms are required.
5) The current price is relatively highp>
When the capacity is maintained, it is generally not mentioned that the capacity is maintained at a certain discharge rate and a certain temperature, but different discharge rates and certain temperature retention capabilities are different, but it does not matter, we can rely on the terminal voltage roughly Judge the state of charge, and then calculate the special battery holding capacity at room temperature according to the change of the inherent capacity.
The ambient temperature of the substation and communication base station is close to 25°, and the evaluation value of the state of charge in the floating charge state is close to 100%. Be careful. I'm talking about the starting voltage, not the floating charge voltage measured online.
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