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Circuit and method for balancing electric quantity of storage battery pack

A technology of battery pack and balancing circuit, applied in battery circuit devices, circuit devices, current collectors, etc.

Active Publication Date: 2014-09-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to improve the consistency of the SOC of each single battery in the process of battery pack power balance, thereby providing a battery pack power balance circuit and a balancing method thereof

Method used

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  • Circuit and method for balancing electric quantity of storage battery pack
  • Circuit and method for balancing electric quantity of storage battery pack
  • Circuit and method for balancing electric quantity of storage battery pack

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specific Embodiment approach 1

[0045] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 1. A power balance circuit for battery packs, the battery pack is composed of N cells in series, where N is a positive integer greater than or equal to 2; it includes a switch network, a bidirectional full-bridge DC-DC converter 14, a fault Detection circuit 13 and control circuit 15;

[0046] Switching network: used to select any single battery in the battery pack, and make the single battery connect to the bidirectional full-bridge DC-DC converter 14 with the correct polarity;

[0047] Bidirectional full-bridge DC-DC converter 14: used to transfer the electric energy in the single battery with higher than standard electric power to the battery pack, or to transfer the electric energy of the battery pack to the single battery with lower than standard electric power;

[0048] Fault detection circuit 13: used to provide protection in the event of a short circuit in the battery pack, and send out a fault alarm signal;

[...

specific Embodiment approach 2

[0050] Embodiment 2. The difference between this embodiment and the electric balance circuit for battery packs described in Embodiment 1 is that the switch network consists of N+1 No. 1 switch, No. 2 switch SS1, No. 3 switch SS2, a The No. 1 reversing switch S1, the No. 2 reversing switch S2, the even bus 11 and the odd bus 12; Odd-numbered bus 12; the positive and negative terminals of the single cells in even-numbered positions in the storage battery pack are respectively connected to the odd-numbered bus 12 and the even-numbered bus 11 through two No. 1 switches; the moving end of No. 2 switch SS1 and the moving end of No. 3 switch SS2 The terminals are respectively connected to the two ends of the battery pack; the static terminal of the second switch SS1 and the static terminal of the third switch SS2 are respectively connected to the two voltage signal terminals of the whole group side of the bidirectional full-bridge DC-DC converter 14; Both the No. 1 reversing switch S...

specific Embodiment approach 3

[0055] Embodiment 3. The difference between this embodiment and the electric balance circuit for battery packs described in Embodiment 2 is that the bidirectional full-bridge DC-DC converter 14 is composed of a main circuit and a converter control circuit;

[0056] The main circuit includes No. 1 switch tube Q1, No. 2 switch tube Q2, No. 3 switch tube Q3, No. 4 switch tube Q4, No. 5 switch tube Q5, No. 6 switch tube Q6, No. 7 switch tube Q7, and No. 8 switch tube Tube Q8, No. 1 diode D1, No. 2 diode D2, No. 3 diode D3, No. 4 diode D4, No. 5 diode D5, No. 6 diode D6, No. 7 diode D7, No. 8 diode D8, transformer T, inductor L, a No. filter capacitor C1, No. 2 filter capacitor C2 and current detection resistor R F ;

[0057] The first diode D1 is anti-associated with the first switch tube Q1; the second diode D2 is anti-correlated with the second switch tube Q2; the third diode D3 is anti-correlated with the third switch tube Q3; the fourth diode D4 is anti-correlated with the fo...

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Abstract

The invention provides a circuit and a method for balancing electric quantity of a storage battery pack, relates to the technical field of management of batteries, and aims to improve consistency of states of charge (SOC) of various single batteries of the storage battery pack in an electric quantity balancing process. A switching network is used for selecting any one single battery in the storage battery pack, and a correct pole of the single battery is connected into a bidirectional full-bridge direct current-direct current (DC-DC) converter; the bidirectional full-bridge DC-DC converter is used for transferring electric energy in the single batteries with the electric quantity higher than standard electric quantity into the storage battery pack, and transferring the electric energy of the storage battery pack into the single batteries with the electric quantity lower than the standard electric quantity; a protecting and fault detecting circuit has a protecting function under the condition of short circuit of the storage battery pack and transmits a fault alarming signal; and a control circuit is used for detecting voltage values of the single batteries, estimating the electric quantity of the single batteries, controlling the switch network to be communicated with the corresponding batteries, controlling the bidirectional full-bridge DC-DC converter to balance the electric quantity and receiving the fault alarming signal, and is communicated with an upper computer through a communication port. The circuit and the method are applicable to balancing the electric quantity of the storage battery pack.

Description

technical field [0001] The invention relates to the technical field of battery management. Background technique [0002] Due to the low voltage and small capacity of the single cells, in actual use, the single cells must be connected in series and parallel to form a battery pack to meet the requirements of use. However, limited by the production process, the battery will have inconsistencies in parameters such as capacity, coulombic efficiency, internal resistance, and self-discharge rate during the production process. During the use of the battery, due to the inconsistency of the contact resistance between the batteries, the difference in the capacity fading speed, the imbalance of the temperature of the battery pack, etc., the inconsistency of the battery in use will also be caused. The above-mentioned inconsistencies will lead to differences in battery power, and with the use of the battery pack, there will be a tendency to diverge, which will lead to a decline in the pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
Inventor 朱春波郭尧逯仁贵孙金磊
Owner HARBIN INST OF TECH
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