Battery Pack Equalizer
A technology for equalizing devices and battery packs, which is applied in battery circuit devices, circuit devices, charge equalization circuits, etc., and can solve problems such as the matching of charging amounts and the inability to optimize the execution timing of equalization processing.
Active Publication Date: 2015-10-28
SUZUKI MOTOR CORP
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- Application Information
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Problems solved by technology
For this reason, if the restriction on the timing of performing equalization processing is removed, the equalization processing will eventually be performed frequently as described above
[0015] Note that in the battery pack balancing device described in Japanese Patent Application Laid-Open No. 2009-38876, the lowest voltage of a single unit cell is used as a reference, and the threshold value compared with the difference between the unit cells is set, so there may be a minimum The voltage may match the charge level of the entire battery pack, and there may be cases where the execution timing of equalization processing cannot be optimized
Method used
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Embodiment Construction
[0037] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Figure 1 to Figure 4 It is a diagram showing an example of a case where the first embodiment of the battery pack balancing device according to the present invention is mounted on an electric vehicle.
[0038] figure 1 Among them, the electric vehicle 100 is configured as a hybrid electric vehicle (HEV: Hybrid Electric Vehicle), which runs by installing an internal combustion engine 101 and an electric motor 102 as power sources. The internal combustion engine 101 outputs driving force for driving the electric vehicle 100 by supplying liquid fuel such as gasoline stored in a fuel tank not shown in the figure and drives the internal combustion engine, and the electric motor 102 drives the electric motor by supplying electric power stored in the battery 103 to output driving force for running electric vehicle 100 . In addition, the battery 103 functions...
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The device (10) has a charge current detection unit (11) for determining an entire charge current of a battery pack, and a threshold adjusting unit (12) for adjusting different charge state thresholds based on the entire charge current. An identification number detection unit (13) determines an inhomogeneity identification number that indicates an inhomogeneity of a single charge state of single batteries. An input control unit (14) controls inputting of a charge amount of the single batteries if the thresholds are reached. The device acknowledges that the number is larger than the thresholds.
Description
technical field [0001] The invention relates to a battery pack balancing device, in particular to a device for balancing the charge states of each unit battery connected in series in a battery pack. Background technique [0002] As the battery, there is a case of using a battery pack capable of supplying current at a desired voltage to the load side by connecting independent unit cells in series. As for such a battery pack (battery), a frequently used type is a type that can be repeatedly used by recharging according to a decrease in the charge amount (charging rate) by employing a rechargeable unit battery. Note that in recent years, lithium-ion batteries are often used as the unit cells of this type of battery pack. [0003] Currently, battery packs have a tendency for the state of charge of each unit cell to be non-uniform when charging and discharging are repeated, and as Figure 8 As shown in , even in the case of using the process of charging the entirety of the unit ...
Claims
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IPC IPC(8): H02J7/00
CPCH02J7/0016Y02T10/7055Y02T10/70
Inventor 宫野龙一伊藤智森川知明
Owner SUZUKI MOTOR CORP