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

Pending Publication Date: 2018-09-18
FAW VOLKSWAGEN AUTOMOTIVE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the topological structure of series first and then parallel, the biggest problem is that after repeated charging and discharging of the cells, there will be voltage differences between the parallel cells of the same group because there is no voltage equalization mechanism, and this trend will be gradually amplified. The connection form of series after parallel needs to solve this problem

Method used

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  • Battery module parallel balancing control device
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  • Battery module parallel balancing control device

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a battery module parallel balancing control device. The battery module parallel balancing control device is used for a battery pack composed of cells of m parallel groups and ntandems, and comprises a parallel balancing resistor network unit, a parallel balancing circuit switcher network unit, and a voltage sampling network unit. When the device is in a normal work mode, at least two cell channels are opened in each parallel group of the battery pack so as to form a parallel balancing loop, the parallel balancing resistor in the loop can spontaneously perform power balancing on the cells in the same parallel group, thereby eliminating the voltage difference of the cells in the same parallel group, and the safety loophole caused by the voltage difference of the parallel cells in the same group due to absence of a voltage balancing mechanism after the cells are repeatedly charged and discharged is avoided.

Description

technical field [0001] The invention relates to the field of battery protection, in particular to a parallel balance control device. Background technique [0002] At present, the common high-voltage battery packs are formed by combining a large number of single cells in series and parallel. In order to strengthen the structure and facilitate assembly, the battery cells are generally grouped into battery modules, and the battery modules are further combined to form a battery pack. With the current battery cell technology and manufacturing level, under the same total voltage, the use of multi-parallel structure is an effective way to increase the driving range. In the topology of the battery pack, it can be connected in series first and then in parallel, or in parallel and then in series. The two topologies are completely equivalent in terms of performance, but they differ in safety performance. In terms of performance, it is better than the form of paralleling first and then...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0026H02J7/0016H02J7/0019H02J7/0036
Inventor 杨博文李里张舟郑帅王磊邵冰刘颖
Owner FAW VOLKSWAGEN AUTOMOTIVE CO LTD
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