Battery module parallel balancing control device
A technology of equalization control and battery modules, applied in battery circuit devices, circuit devices, charge equalization circuits, etc., can solve problems such as voltage differences, and achieve the effect of stabilizing the balanced circuit state
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Embodiment 1
[0041] refer to figure 1 or figure 2 , a battery module parallel balance control device provided in this embodiment is used for a battery pack composed of m parallel groups and n series cells, counting from the total positive pole to the total negative pole of the battery pack, and using Indicates the cell in the yth parallel group and the nth series group in the battery pack, the device includes a parallel equalization resistor network unit 1, a parallel equalization switch network unit 3 and a voltage sampling network unit 5, wherein,
[0042] In this embodiment, the parallel balancing resistor network unit 1 is composed of m+1 groups of n parallel balancing resistors Rpbal in each group, and one end of each parallel balancing resistor Rpbal is connected to any two cascaded adjacent cells Cell Between, the other end of the parallel balance resistor Rpbal is connected to the parallel balance switch network unit 3; the first group of parallel balance resistor Rpbal is conne...
Embodiment 2
[0046] refer to figure 1 , a battery module parallel balance control device provided in this embodiment further includes a series balance network unit 4, and the series balance network unit 4 includes m series balance modules. In this embodiment, each series balance module consists of a series Each series equalization module is connected in parallel with an ADC sampling chip, that is, each series equalization module is connected between two adjacent switch nodes.
[0047] When the switch of the parallel balance switch connected to the series balance module and its two ends is closed at the same time, the battery connected to the series balance network unit 4 will be connected to the series balance network unit 4. For example, the voltage sampling network unit 5 monitors the battery cell If the voltage value is higher than the voltage value of the other cells in the second series group, the external controller sends a control signal, and then it is connected to the switch node...
Embodiment 3
[0050] by figure 1 Taking Uy as an example, analyze the sampling value formula of a battery module parallel equalization control device provided in this embodiment. Uy is the value collected by the yth ADC voltage sampling chip in the voltage sampling network unit 5. Uy can pass The derivation of the parallel resistance network unit, assuming n cells of the yth parallel group are all turned on by the parallel balance switch, then Uy can be expressed by n voltage formulas, namely
[0051] Uy=(i 1 y –i 1 x )Rpbal+U cell1 y +(i 1 y –i 1 z )Rpbal
[0052]
[0053]
[0054] ...
[0055]
[0056] In the above n formulas, when the series equalization is not turned on, the current has the following quantitative relationship:
[0057]
[0058]
[0059] When the series equalization is turned on, the current has the following quantitative relationship:
[0060]
[0061]
[0062] After bringing the two current relations into the n expressions of Uy, we ...
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