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Power supply unit having plurality of secondary batteries

一种电源单元、电池的技术，应用在电池电路装置、电气元件、集电器等方向，能够解决开路电压不匹配等问题

Active Publication Date: 2011-11-09
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, although the open circuit voltage value of the storage battery differs according to the SOC, the open circuit voltage in an appropriate range of the lead storage battery (such as 12.7V to 12.8V) and the open circuit voltage in the appropriate range of the high performance storage battery generally do not match
Therefore, for example, when the set voltage Vreg is set to a high voltage to facilitate the charging of the lead storage battery, even if the SOC of the high performance battery is sufficiently high, the generated electric power flows into the high performance storage battery, so the overcharging of the high performance storage battery become a problem
In addition, electric power is supplied from the high-performance battery to electric loads such as starter motors arranged to operate using the lead battery as a power source, so over-discharging of the high-performance battery becomes a problem

Method used

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  • Power supply unit having plurality of secondary batteries
  • Power supply unit having plurality of secondary batteries
  • Power supply unit having plurality of secondary batteries

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0060] A vehicle in which the power supply unit according to the first embodiment is installed uses an internal combustion engine as a travel drive source. The vehicle has an idle-stop function that automatically stops the internal combustion engine when a predetermined automatic stop condition is satisfied, and automatically restarts the internal combustion engine when a predetermined automatic restart condition is satisfied. While a starter motor that rotates a crankshaft when starting an internal combustion engine is included, a travel motor that assists in running the vehicle is not included.

[0061] Such as figure 1 As shown in , the vehicle includes an alternator 10 (generator), a regulator 11 (power generation control part), a lead storage battery 20 (first battery), a lithium ion battery 30 (second battery), various electric loads described below. 41, 42 and 43, two MOS-FETs 50 and 60 (switching parts, and semiconductor switches), and Li (lithium) storage battery re...

no. 2 example

[0127] When the power supply state of the vehicle is OFF, along with the power supply to the ECU 80 is stopped, the output of the ON / OFF signal from the ECU 80 to the MOS-FETs 50 and 60 is also stopped. Therefore, as described above, the MOS-FETs 50 and 60 and the Li storage battery relay 70 are also turned off.

[0128] Therefore, although the dark current required during power OFF to the general electric load 42 is supplied from the lead storage battery 20 , the dark current required during power OFF to the electric load 43 requiring a constant voltage cannot be supplied from the lithium ion battery 30 . For example, if a normally open type relay is used as the Li storage battery relay 70, dark current can be supplied from the lithium ion battery 30 to the electric load 43 requiring a constant voltage. However, since the capacity of the lithium ion battery 30 is set significantly smaller than that of the lead storage battery 20, the lithium ion battery 30 immediately becomes...

no. 3 example

[0141] according to Figure 10 to Figure 13 In the above-mentioned second embodiment shown in , dark current is supplied from the lead storage battery 20 to the electric load 43 requiring a constant voltage via the resistance element 90 during the power OFF period. On the other hand, according to Figure 14 In the third embodiment shown in , a latching relay 92 (a latching switch (energization maintaining part)) having a self-latching function replaces the resistive element 90, and the rectifying element 91 is not required in this case.

[0142] The ON operation and OFF operation of the latch relay 92 are controlled to be switched by the ECU 80 . When the accessory switch is turned on and power is supplied to the ECU 80, the latch relay 92 is controlled to be always OFF. Immediately before the power supply to the ECU 80 is blocked when the accessory switch is turned off, the ECU 80 turns on the latch relay 92 . Therefore, after the power supply to the ECU 80 is blocked, the...

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PUM

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Abstract

The power supply unit includes a lead secondary battery (first battery) that is capable of being charged with power generated by an alternator (power generator); a lithium secondary battery (second battery) that is electrically connected in parallel to the lead secondary battery, capable of being charged with power generated by the alternator (power generator), and has higher output density or higher energy density than the lead secondary battery; and a switching means that is electrically connected between the alternator and the lead secondary battery, and the lithium secondary battery, and switches between conduction and blocking. The switching means is configured by a plurality of MOS-FETs (semiconductor switches) being connected in series such that respective parasitic diodes present in the semiconductor switches face opposite directions.

Description

technical field [0001] The present invention relates to a power supply unit comprising two accumulators: a lead accumulator and a second accumulator, such as a lithium accumulator, having a higher power density and energy density than the lead accumulator. Background technique [0002] A lead storage battery that supplies electric power to various electric loads such as a starter motor is generally installed in a vehicle that uses an internal combustion engine as a driving source for travel. Although lead storage batteries are cheaper than high-output and high-energy-density storage batteries (high-performance storage batteries) such as nickel storage batteries and lithium storage batteries, their durability against frequent charging and discharging (accumulated charge and discharge amount) is low. Lead storage batteries are frequently discharged particularly in vehicles with an idling-stop function, and early deterioration of the lead storage batteries becomes a problem. F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/14
CPCY02T10/7011H02J7/1423Y02T10/7016Y02T10/70
Inventor 今井敦志田村博志齐藤成则
Owner DENSO CORP
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