Battery grouping framework based on flexible connection and redundancy

A flexible connection and battery module technology, applied in battery circuit devices, secondary battery charging/discharging, arrangement of multiple synchronous batteries, etc., can solve the problem of no voltage equalization control, high cost, overvoltage and overcurrent protection functions Insufficient and other problems, to achieve the effect of efficient operation

Pending Publication Date: 2020-07-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] To sum up, the existing solutions have the problems of high cost, lack of o

Method used

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  • Battery grouping framework based on flexible connection and redundancy
  • Battery grouping framework based on flexible connection and redundancy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1, seefigure 1 , The battery group architecture based on flexible connection modules and redundancy includes: battery cluster 1#-m#, BMS and parallel switch box 1#-m#, DC bus, etc. Battery cluster 1# is connected to the DC bus through BMS and parallel switch box 1#. Similarly, battery cluster m# is connected to the DC bus through BMS and parallel switch box m#. Wherein, the m battery clusters have the same structure, but the number of battery modules may be different. n+k battery modules are connected in series through n+k flexible connection modules ("+" and "-" of adjacent flexible connection modules are connected) to form a battery cluster, among which n battery modules must be used to establish the DC bus voltage The number of k battery modules is redundant; the battery modules in different battery clusters can be of different batches, voltages or manufacturers, and the values ​​of n and k in different battery clusters can also be different, but its The val...

Embodiment 2

[0056] Choice of n, k and m values.

[0057] The value of n is determined by the DC bus voltage and the terminal voltage of the battery module. If the DC bus voltage is 1000V and the nominal terminal voltage of the battery module is 48V, then n=1000 / 48=20.8, and the value is 21. The value of k is determined by the battery rest time and the interval between turns. If the battery resting time is 30 minutes and the interval between turns is 15 minutes, then k=30 / 15=2, and the minimum value of k is 2. Similarly, if the interval between turns is 10 minutes, then k=3. The larger the value of k, the more the number of strings, and the larger the capacity of the battery cluster.

[0058] m represents the number of battery clusters, which is positively related to the group capacity and has nothing to do with the architecture itself.

Embodiment 3

[0060] Input and exit of the battery module.

[0061] The battery cluster control management unit controls the input and withdrawal of the battery modules of the cluster through the flexible connection module according to the control strategy. Flexible connection module topologies such as figure 2 As shown, it includes: charge and discharge switch (K1), charge diode (D1), bypass switch (K2), bypass diode (D2) and monitoring control unit, charge and discharge switch (K1) and bypass switch (K2) There shall be mechanical or logical interlocks. Among them, one end of the charging and discharging switch (K1) is connected to the "+" of the battery interface, and the other end is connected to the "+" of the charging and discharging interface to realize the charging and discharging of the battery module; one end of the bypass switch (K2) is connected to the charging and discharging interface. The "+" of the charging and discharging interface is connected to the other end, and the b...

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Abstract

The invention relates to a battery grouping framework based on flexible connection and redundancy. The battery framework is composed of a flexible connection device and a redundant battery module andcan realize overvoltage and overcurrent protection, quitting of a faulty battery module and active equalization control of the battery module, and assist a BMS system to estimate SOC and SOH accordingto the voltage of the battery end; rapid adjustment of the voltage and the output power of the battery cluster end after grouping is realized through flexible input and output of the battery modulesso that differentiated retired battery module grouping is realized and echelon battery utilization is realized.

Description

Technical field: [0001] The invention relates to the field of new energy, in particular to a battery structure and a flexible connection and redundant battery group structure. Background technique: [0002] According to the electric vehicle development plan, it is estimated that by 2020, the production capacity of pure electric vehicles and plug-in hybrid electric vehicles will reach 2 million, and the cumulative production and sales will exceed 5 million. These electric vehicles will generate a large number of decommissioned power batteries. Although decommissioned batteries are no longer suitable for use in electric vehicles, they still have an energy storage capacity of about 80% of the rated capacity, which can be used in other fields. If they are directly discarded, it will cause serious energy waste. Therefore, in order to make full use of the value of power batteries and save social resources, it is necessary to use decommissioned power batteries in groups. [0003]...

Claims

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Application Information

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IPC IPC(8): H02J7/00H02J3/32H01M10/42H01M10/44
CPCH02J7/0014H02J3/32H01M10/425H01M10/44Y02E60/10
Inventor 赵东元兰越前訾振宁祝贺
Owner TSINGHUA UNIV
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