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Method of balancing charge and discharge levels of a battery by switching blocks of cells of the battery

A battery unit and block technology, applied in secondary battery charging/discharging, battery/fuel cell control devices, battery pack components, etc., can solve problems such as bulky, expensive, and reduced system energy efficiency, and achieve optimal energy efficiency effect

Active Publication Date: 2017-07-28
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 of balancing charge and discharge levels of a battery by switching blocks of cells of the battery
  • Method of balancing charge and discharge levels of a battery by switching blocks of cells of the battery
  • Method of balancing charge and discharge levels of a battery by switching blocks of cells of the battery

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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 an apparatus for balancing the overall charge level among a plurality of battery cell blocks in a battery. The blocks can be connected to a circuit during a charging phase, during which the battery cells of the connected blocks accumulate charge and during a discharging phase, where the battery cells of the connected blocks The unit returns the charge in the form of current. The device includes at least one series switch and one parallel switch. This series switch is able to connect one block into the circuit in series with the other blocks when it is closed and when the parallel switch is open, so that the blocks are energized during the charging and discharging phases. connected. This parallel switch can remove the block from the circuit when it is closed and when the series switch is open, so that if the discharge disconnection condition is met during the discharge phase or if it is met during the charging process The bank is disconnected when a charging disconnect condition is met, and the bank further includes means for locally balancing the charge levels of its cells while being 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 Patents(China)
IPC IPC(8): H02J7/00H01M10/44G01R31/36B60L11/18B60L3/00B60L3/04H01M10/0525H01M10/48H01M10/42H01M50/569
CPCH01M10/441B60L3/0046B60L3/04B60L2240/545B60L2240/547B60L2240/549H01M10/0525H01M10/482H01M2010/4271H01M2220/20B60L53/00B60L58/18B60L58/22H02J7/0016Y02E60/10Y02T10/70Y02T10/7072Y02T90/14H02J7/007182H01M50/569
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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