Apparatus and method for battery balancing
A technology for equalization and battery packs, which is applied in the direction of electrical devices, battery circuit devices, circuit devices, etc., and can solve the problems of reduced efficiency of equalized circuits, increased battery energy loss, and time-consuming problems
Inactive Publication Date: 2015-10-07
TOYOTA IND CORP
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Problems solved by technology
The correction of this deviation requires repeated equalization and is time-consuming, resulting in increased battery energy loss
In active equalization, when the monitored voltage is close to the target voltage, the current used for equalization is smaller, resulting in lower efficiency and increased losses in the equalization circuit
Method used
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Embodiment Construction
[0021] Embodiments of the present invention will be described below with reference to the accompanying drawings. refer to figure 1 , a plurality of battery cells 102 are connected in series to form a battery pack 101 . The cell balancing device 103 is used to balance the voltage of a plurality of battery cells 102 in the battery pack 101 . The cell balancing device 103 may be provided by, for example, an active balancing circuit which takes charge from one or more battery cells 102 and transfers the charge to the one or more remaining battery cells 102, The voltages of the plurality of battery cells 102 are thereby equalized. Alternatively, the cell balancing device 103 may be provided by a passive balancing circuit that allows one or more selected cells 102 of the plurality of cells 102 to discharge, thereby balancing the plurality of cells 102 voltage.
[0022] The battery cell monitor 104 is used to monitor at least the voltage and / or current of each battery cell 102 . ...
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There is provided an apparatus for equalization of a battery pack that is composed of plural battery cells. The apparatus includes: a cell balancing device equalizing the voltages of the plural battery cells; a battery cell monitor monitoring the voltage and / or current of each battery cell; a correction voltage calculator calculating correction voltage for a subject battery cell that needs to be equalized, based on the monitored voltage and / or current of the subject battery cell, wherein the correction voltage depends on internal resistance of the subject battery cell; and a cell balancing controller determining the subject battery cell. The cell balancing controller corrects target voltage for equalization of the subject battery cell by the calculated correction voltage, and causes the cell balancing device to execute equalization of the subject battery cell so that the monitored voltage of the subject battery cell reaches the corrected target voltage.
Description
technical field [0001] The present invention relates to an apparatus and method for controlling the equalization of the voltage of a plurality of battery cells in a battery pack. Background technique [0002] Vehicles having an electric motor as a power source in addition to an engine have been put into practical use, such as hybrid vehicles, plug-in hybrid vehicles, hybrid vehicles and hybrid electric vehicles, and transportation machines (hereinafter referred to as vehicles). In addition, electric vehicles that have no engine and are driven only by electric motors have also been put into practical use. Batteries, such as lithium ion batteries that are compact and have a large capacity, have been used as a power source for electric motors for driving such vehicles. For vehicular applications, the battery may be a battery pack made up of blocks, where each block has a number of battery cells connected in series. Series connection of battery cells allows supply of voltage r...
Claims
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IPC IPC(8): H02J7/00H02J7/02B60L3/00B60L50/16
CPCH02J7/0014Y02T10/7055Y02T10/70
Inventor 铃木正彰广濑慎司
Owner TOYOTA IND CORP