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Retired battery module adopting flexible connection protection

A battery module, flexible connection technology, applied in battery circuit devices, arrangement of multiple synchronous batteries, secondary battery repair/maintenance, etc., can solve the lack of overvoltage and overcurrent protection functions, no uniform charging control, circuit Complicated structure and other problems, to achieve the effect of solving the problem of flexible connection, sensitive circuit response, and simple circuit structure

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

AI Technical Summary

Problems solved by technology

[0006] In summary, the above solutions have the problems of high cost, complex circuit structure, lack of overvoltage and overcurrent protection functions, or no uniform charging control

Method used

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  • Retired battery module adopting flexible connection protection
  • Retired battery module adopting flexible connection protection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1, see figure 1 , The flexible connection protection device for single decommissioned battery modules includes: charge and discharge switch (K1), charge diode (D1), bypass switch (K2), bypass diode (D2) and monitoring control unit, charge and discharge switch (K1) There should be a mechanical or logical interlock with the bypass switch (K2). 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 battery module is bypassed; the anode of the charging diode (D1) is connected to the "+" of the charging and discharging interface, and the cathode is connected to the "-" of the battery inter...

Embodiment 2

[0070] Embodiment 2, continue to refer to as figure 2 As shown, before charging (discharging) starts, the battery cluster control management unit (that is, the master control device) selects n batteries with smaller (larger) terminal voltages among n+k battery modules according to the DC bus voltage The module is put into operation, and the other k battery modules exit the bypass. After such selection, the terminal voltages of the m battery clusters are the same (within a set error range, for example, ΔU=1.0V). Then each battery cluster is connected to the DC bus in turn to start charging (discharging). Among them, n battery modules are the necessary quantity to establish the DC bus voltage, and k battery modules are redundant

[0071] Set the rotation interval to ΔT (for example, 10min), and every time a ΔT is experienced, exit the battery module with the highest (small) terminal voltage in the charging (discharging) state, and put into k bypass states with the minimum (la...

Embodiment 3

[0079] Estimation of battery module and single SOC, SOH

[0080] This battery architecture provides the conditions and means for estimating the SOC and SOH of battery modules and monomers by using the battery terminal voltage after standing still. Combined with other methods such as charge accumulation method, it can more accurately estimate the SOC and SOH of battery modules and monomers. The terminal voltage of the battery after standing for 30 minutes can basically reflect the state of charge of the battery and can be used to estimate SOC and SOH. During operation, the battery modules are input and withdrawn in turn. Assuming that the interval between turns is 10 minutes and the number of redundancy is 3, the resting time of the batteries exiting the bypass is 30 minutes. The greater the number of redundancy, the longer the battery module can stand still.

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Abstract

The invention relates to a retired battery module adopting flexible connection protection, and is used for realizing differentiated retired battery module grouping and realizing echelon battery utilization. The battery module flexible connection module is provided with an execution and monitoring unit and can detect and upload voltage and temperature of a battery and a module. In the charging anddischarging process of the battery, when the voltage of the battery exceeds the normal working voltage range of the battery, the battery is withdrawn to protect the battery, and differentiated retiredbattery modules are grouped and echelon battery utilization is realized through a uniform charging control function. The invention further relates to a battery pack. The battery pack is formed by sequentially connecting a plurality of battery modules in series through the battery module flexible connection device.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a decommissioned battery module protected by a flexible connection. 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 stages. [0003] Whether it is a ne...

Claims

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Application Information

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