Is the battery pack balance protection board good? Battery protection board balance principle
Is the balance protection board for lithium-ion battery packs good? Balance principle of lithium-ion battery protection board. Many lithium-ion battery protection board manufacturers mention the equalization function when introducing their products. The lithium-ion battery protection board, which plays an important role in the battery system, has gradually gained everyone’s attention as an effective means to extend battery life. The critical-use lithium-ion battery protection board equalization system has also attracted widespread attention.
Is the balance protection board for lithium-ion battery packs good?
At present, there are two ways of balancing and multi-series lithium-ion battery systems in the market: traditional passive balancing and active balancing. There are some controversies over whether the lithium-ion battery pack protection board should have a balancing function. The following is a point of opinion of the lithium-ion battery manufacturer.
1. It is necessary to bring balance: In the case of a relatively long storage time for the production of lithium-ion battery packs, due to the different static power consumption of the protection board and the self-discharge rate of each battery cell, each string of the entire battery pack is formed The battery voltage is inconsistent, so there is a significant pressure difference, but when the capacity is consistent, the equalization has the function of equalizing the voltage of the lithium-ion battery pack, so as to achieve the effect of full charge and full discharge of the battery pack capacity, so that the battery pack Give full play to its effectiveness.
2. The situation where the balance cannot be used: Many people think that the lithium-ion battery pack has a balanced use in the middle and later stages of use. In fact, when the battery pack is used in the middle and later stages, due to the different capacity losses of each battery cell, it causes a problem. The capacity is poor, and the balance of the protection board cannot make up for the battery cell capacity. Therefore, we should understand that the voltage balance of the lithium-ion battery protection board is the voltage, and the capacity cannot be supplemented.
If the lithium-ion battery pack is within 13 strings, it is recommended that it does not have the equalization function, but the battery pack must be strictly shut down, and the battery capacity and internal resistance must be as consistent as possible. Lithium-ion batteries are afraid of storage and use! Lithium-ion batteries should be stored in a single unit rather than in a whole group. After the battery pack is assembled, it should be tested as soon as possible and handed over to the consumer as soon as possible.
When charging a group of lithium-ion batteries in series, ensure that each battery is charged in a balanced manner, otherwise the performance and life of the entire group of batteries will be affected during use. Commonly used equalization charging techniques include constant shunt resistance equalization charging, on-off shunt resistance equalization charging, average battery voltage equalization charging, switched capacitor equalization charging, step-down converter equalization charging, inductance equalization charging, etc.
Balance principle of lithium ion battery protection board
During the charging process of lithium-ion batteries, each lithium-ion battery is equipped with an equalization circuit. During charging, the voltage of each battery is controlled by the equalization circuit of the lithium-ion battery protection board to keep each string of batteries in the same state to ensure The performance and life of lithium-ion batteries.
The single-cell lithium-ion battery protection chip of the balance principle control circuit of the lithium battery protection board battery management system BMS can be selected according to the voltage level and protection delay time of the single-cell lithium-ion battery to be protected. The shunt discharge branch resistance can be realized by a power resistor or a resistor network.
The balance principle of lithium battery protection board battery management system BMS protects the chip subsystem model. It is important to simulate the timing and logic of the protection action with logic operation modules, symbolic function modules, one-dimensional look-up modules, integration modules, delay modules, switch modules, and mathematical operation modules. . Due to the difference between the simulation environment and the real circuit, no filtering and strong and weak electrical isolation should be used during simulation, and redundant modules can easily lead to a long simulation time.
According to the application requirements, the balancing principle of lithium battery protection board battery management system BMS can be used to protect and protect power lithium-ion battery packs of any structure and voltage level after changing the type and number of protection chips in series, and the power levels of switching devices and energy-consuming components in the circuit. Even charge.
Summary: The lithium battery protection board battery management system BMS has the function of protecting the battery and preventing the battery from overcharging. Equalization has the function of equalizing the voltage of the lithium-ion battery pack, so as to achieve the effect of full charge and full discharge of the battery pack capacity, so that the battery pack can exert the maximum effect.