Charge control device

Abstract

A charge control device capable of charging a capacitor while restraining the progress of deterioration of the capacitor without unnecessary charge/discharge of the capacitor. A charge control device is provided with a voltage sensor (133) for detecting the voltage of a capacitor (101), a current sensor (135) for detecting the charge/discharge current of the capacitor (101), a battery ECU (123) for estimating the SOC of the capacitor (101) based on the detected voltage, and a management ECU (117). The management ECU (117) calculates the charge/discharge amount from the start of charge of the capacitor (101) by integrating the charge/discharge currents detected by the current sensor (135) and controls the charge of the capacitor (101) based on the estimated SOC and the calculated charge/discharge amount. The management ECU (117) updates and sets the estimated SOC to an actual use upper limit SOC based on the state characteristics of the capacitor (101).

Description

technical field [0001] The present invention relates to a charging control device for a chargeable electric storage device. Background technique [0002] Vehicles such as EVs (Electric Vehicles) and HEVs (Hybrid Electrical Vehicles: Hybrid Electric Vehicles) are equipped with a battery that supplies electric power to a motor or the like. Storage batteries such as lithium-ion batteries and nickel-metal hydride batteries are mounted on the storage battery mounted on the vehicle. [0003] When using, for example, a lithium ion battery as the accumulator, if the accumulator is mounted on a vehicle and left for a long period of time or used for a long period of time, the accumulator will deteriorate. Deterioration of accumulator such as Figure 27 As shown, the state of charge (SOC: State Of Charge) of the battery is obtained by normalizing the remaining capacity of the battery by setting 100 (%) and 0 (%) when fully charged and fully discharged, respectively. value) is easy to...

AI Technical Summary

Problems solved by technology

As a result, the accumulator deteriorates, and the proportion of electric driving decreases, such as a decrease in the distance that can be driven by electric power or a reduction in the time for assisting and regenerating, and the user may feel uncomfortable while driving.

In addition, the deterioration of the accumulator is promoted due to parking, and the vehicle may not be able to run due to the deterioration of the accumulator even if the traveling distance is short.

[0013] In addition, in the technique of Patent Document 3, the usable capacity of the storage battery is changed according to the estimated deterioration state, but if the range of the usable capacity is narrowed in order to suppress the deterioration of the storage value, there may be a possibility that the electric running distance will be shortened or the electric equipment will be damaged. The situation that affects the behavior of the vehicle, such as the reduction of the usable range

[0014] In addition, in the technique of Patent Document 4, since the control is performed so that the usable capacity of the battery and the vehicle output are maximized, the deterioration of the battery may be accelerated and the running performance of the vehicle may be affected.

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