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Method for balancing the charge and discharge level of a battery by switching its blocks of cells

A battery unit, charging current technology, applied in the direction of secondary battery charging/discharging, battery/fuel cell control devices, battery pack components, etc. The effect of efficiency

Active Publication Date: 2014-12-17
RENAULT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, a major disadvantage of such systems is that, since the blocks have references at different potentials, energy transfer between multiple blocks is typically done through the use of "flyback" type isolation transformers , which appear to be expensive, bulky and greatly reduce the energy efficiency of the system

Method used

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  • Method for balancing the charge and discharge level of a battery by switching its blocks of cells
  • Method for balancing the charge and discharge level of a battery by switching its blocks of cells
  • Method for balancing the charge and discharge level of a battery by switching its blocks of cells

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Embodiment Construction

[0028] figure 1 An example of a battery pack for an electric or hybrid vehicle according to the present invention is shown in a schematic diagram. The illustrated battery pack includes N blocks Bi, where 1≤i≤N-1, and in the illustrated example N>6, at figure 1Only four chunks labeled B1, B2, B3 and B4 are shown in . These blocks B1, B2, B3, and B4 each include six Li-ion battery cells connected in series, labeled C11, C12, C13, C14, C15, and C16 in block B1, and C21, C16 in block B2. C22, C23, C24, C25, and C26, labeled C31, C32, C33, C34, C35, and C36 in block B3, and labeled C41, C42, C43, C44, C45, and C46 in block B4. Furthermore, each of these blocks B1, B2, B3 and B4 includes an integrated circuit for measuring the voltage across the terminals of each battery cell inside the block, these circuits being labeled IC1, IC2, IC3 and IC4 respectively. Each of these circuits IC1, IC2, IC3 and IC4 is capable of measuring between 6 and 16 battery cell voltages in this non-limi...

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Abstract

The present invention relates to a device for balancing the overall levels of electrical charge in a plurality of blocks of cells in a battery. The blocks are able to be connected in a circuit during a charging phase during which the cells of the connected blocks accumulate charge, and during a discharging phase during which the cells of the connected blocks give back the charge in the form of an electrical current. The device comprises at least one series switch and one parallel switch. The series switch is able, when it is closed and the parallel switch is open, to connect a block to the circuit, in series with the other blocks, so that said block is connected during the charging and discharging phases.; The parallel switch is able, when it is closed and the series switch is open, to disconnect said block from the circuit, so that said block is disconnected if discharging disconnection conditions are met during the discharging phase or if charging disconnection conditions are met during the charging phase, said block furthermore comprising means for balancing locally the charge levels of its cells when it is disconnected.

Description

technical field [0001] The present invention relates to a method of balancing charge and discharge levels of a battery by switching blocks of cells of the battery. In particular, but not exclusively, the invention is applicable to lithium-ion (Li-ion) batteries that power the power train of an electric or hybrid vehicle. Background technique [0002] Li-ion batteries are particularly suitable for powering the power train of an electric or hybrid vehicle due to their high voltage and their high energy density. In such batteries, the Li-ion cell is an essential component that contains a certain amount of electrolyte, whether solid or liquid, through which lithium ions can migrate between the cathode and the anode. During the charging phase of the battery, this ion migration is responsible for the build-up of charge in the battery cells. During the discharge phase of the battery, this ion migration is responsible for the flow of electrical current between the cathode and anod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44G01R31/36B60L11/18B60L3/00B60L3/04H01M10/0525H01M10/48H01M10/42H01M50/569
CPCH01M10/441B60L3/0046B60L3/04B60L2240/545B60L2240/547B60L2240/549H01M10/0525H01M10/482H01M2010/4271H01M2220/20B60L53/00B60L58/18B60L58/22H02J7/0016Y02E60/10Y02T10/70Y02T10/7072Y02T90/14H02J7/007182H01M50/569H02J7/00H01M10/44G01R31/36B60L50/50
Inventor A-L·布伊-旺F·索诺夫P·佩里雄S·卡尔库埃
Owner RENAULT SA
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