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Cell balance control device and cell balance controlling method

A technology of battery unit and balance control, which is applied in the direction of battery circuit devices, circuit devices, charge equalization circuits, etc., and can solve problems such as battery degradation

Inactive Publication Date: 2015-04-01
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, for example, during a period in which the ignition-on state is dominant, the voltage or remaining capacity of each battery cell exhibits a wide difference, thereby easily deteriorating the battery

Method used

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  • Cell balance control device and cell balance controlling method
  • Cell balance control device and cell balance controlling method
  • Cell balance control device and cell balance controlling method

Examples

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Embodiment Construction

[0027] figure 1 is a block diagram of the functions of the battery cell balance control device according to the embodiment of the present invention. The battery cell balance control device 1 of the present invention suppresses the unbalance of the voltages of the battery cells 11 - 1 to 11 - n in the battery 10 .

[0028] The battery 10 includes a plurality of rechargeable battery cells 11-1 to 11-n. The battery cells 11-1 to 11-n are electrically connected in series. The number n of battery cells connected in series is, for example, several tens to several hundreds. The battery 10 can output relatively large DC voltage. In this embodiment, it is assumed that the battery 10 is loaded into a vehicle such as an electric vehicle, a hybrid vehicle using an engine in combination with an electric motor, a forklift, and the like.

[0029] The battery cell balancing control device 1 includes a battery monitoring unit 2 , a battery cell balancing unit 4 and an ECU 7 . The battery ...

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Abstract

A cell balance control device includes a battery monitor unit (2, 3-1 ˆ¼ 3-n), a cell balance unit (4), and an ECU (7), and equalizes serially connected chargeable battery cells (11-1 ˆ¼ 11-n) in a battery loaded into a vehicle. The battery monitor unit (2, 3-1 ˆ¼ 3-n) detects the voltage of each battery cell (11-1ˆ¼11-n). The cell balance unit (4) equalizes the voltages of the plurality of battery cells (11-1 ˆ¼ 11-n) based on the voltage of each battery cell (11-1 ˆ¼ 11-n) detected by the battery monitor unit (2, 3-1 ˆ¼ 3-n) . At least one of the times when an idling stop state of the vehicle starts, when the charging operation of the battery starts, and when the charging operation of the battery terminates triggers the ECU (7) allowing the cell balance unit (4) to equalize the voltage of the plurality of battery cells.

Description

technical field [0001] The invention relates to a battery cell balance control device and a battery cell balance control method for balancing voltages of a plurality of battery cells. Background technique [0002] The technology of realizing high-voltage batteries by connecting multiple rechargeable battery cells in series has been put into practical use. Recently, this type of battery has focused on realizing, for example, an electric vehicle or a hybrid vehicle using an engine in combination with an electric motor. [0003] However, when a battery is charged with a plurality of battery cells connected in series, the output voltage of each battery cell (or the remaining capacity of the battery) may not be uniform. When the battery is loaded into an electric vehicle or the like, discharging during motor driving and charging during regeneration are repeated. Therefore, repetition of the charging operation and the discharging operation may cause uneven voltage of the battery...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H02J7/02
CPCH02J7/0014Y02T10/7055Y02T10/70
Inventor 仓石守
Owner TOYOTA IND CORP
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