Power balancing method for single power battery for vehicle

A battery cell and power battery technology, applied in battery/fuel cell control devices, electric vehicles, vehicle energy storage, etc., can solve the problems of accelerating battery assembly capacity, attenuation, affecting vehicle performance, etc., and achieve a clear purpose of balance , Prevent accelerated aging, and ensure the effect of consistent characteristics

Active Publication Date: 2017-09-08
CHINA FIRST AUTOMOBILE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, the inconsistency of the battery capacity will accelerate the attenuation of the battery assembly capacity, reduce the energy utilization efficiency of the vehicle, and affect the performance of the vehicle

Method used

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  • Power balancing method for single power battery for vehicle
  • Power balancing method for single power battery for vehicle
  • Power balancing method for single power battery for vehicle

Examples

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Embodiment 1

[0027] Based on the consistency of battery cells in the vehicle life cycle and the capacity characteristics of batteries in the vehicle life cycle, this embodiment provides a power balancing method for vehicle power battery cells, which is applied to new energy vehicles. The battery of the vehicle The equalization function of the management system adopts the equalization circuit of discharge equalization, and the SOC of the battery cell is used as the judgment basis, and the equalization target applies the dynamic equalization target described in this embodiment.

[0028] like figure 1 As shown, in the equalizing circuit of this embodiment, each battery cell is connected in parallel with a discharge resistor, and the switch of the parallel circuit is controlled on and off by a microcontroller pin. When the microcontroller determines the battery cell that needs to be balanced, it directly controls the switch of the battery cell connected in parallel to close, and discharges the...

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Abstract

The invention discloses a power balancing method for a single power battery for a vehicle. The method is applied to a battery management system, so that the power of the single power battery can be kept within a range of SOC<AVE>+/-eta. According to the performance attributes of the power battery, eta2 is smaller than eta1 at the first half stage of a life cycle of the vehicle, the power of the single power battery can be kept within a range of SOC<AVE>+/-eta1 through balancing, the power consumed for balancing the power management system is the power designed by power battery redundancy, and the requirements of the vehicle on the power of the battery are not affected by balancing. At a later half stage of the life cycle of the vehicle, eta2 is greater than eta1, the power of the single power battery can be kept within a range of SOC<AVE>+/-eta2 through balancing, the condition that the power deviation of the single battery does not exceed the consistent characteristic is ensured by the balancing function, the phenomena of accelerated ageing, under voltage and zero voltage of individual single battery can be avoided, the power battery meets the requirements of the vehicle on energy, and the consistent characteristic is also ensured, so that the balancing target is more explicit.

Description

technical field [0001] The invention belongs to the field of power batteries of new energy vehicles, and relates to a method for balancing the power of a single power battery of a vehicle. Background technique [0002] As an energy storage unit of new energy vehicles, the power battery directly affects the performance of the vehicle. Because the actual operating environment of new energy vehicles is complex and changeable, in order to ensure that the power battery can work efficiently, reliably and safely, an effective battery management system is necessary. Especially for lithium-ion batteries with strong activity (poor safety), the significance and necessity of the battery management system are even more prominent. [0003] One of the core tasks of the battery management system is to balance the power of the battery cells inside the power battery. Because the internal environment of the battery cannot be guaranteed to be consistent, it is difficult to ensure that the powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L11/18
CPCB60L58/10B60L2240/54Y02T10/70
Inventor 王君君刘海洋王贺敏刘东秦
Owner CHINA FIRST AUTOMOBILE
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