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Power supply system

A technology of power supply system and voltage, which is applied in the direction of circuits, current collectors, measuring electricity, etc., can solve problems such as deterioration, safety issues, and inability to end charging, and achieve high safety effects

Inactive Publication Date: 2010-08-11
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if such a charging circuit for constant voltage charging is used to charge the assembled battery described in Patent Document 1, the charging may not be completed, resulting in characteristic degradation or failure due to overcharging, or causing safety problems.
In addition, since the aqueous solution secondary battery generates heat near full charge, there is a problem that the non-aqueous secondary battery combined with the aqueous solution secondary battery will deteriorate due to heating

Method used

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Examples

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Embodiment 1

[0074] A battery pack consisting of five unit cells connected in series with three CGR18650DA (battery capacity 2.45Ah) and two HHR260SCP (battery capacity 2.6Ah) constitutes the same figure 1 The same power supply system including the forced discharge part and the control part is used as the first embodiment. Here, only one of the unit cells of CGR18650DA (battery capacity 2.45Ah) has a charge capacity of 1Ah remaining, and the other four unit cells are fully discharged to form a battery pack. The forced discharge start voltage Va is set to 4.1 V, the forced discharge end voltage Vb is set to 3.9V.

Embodiment 2

[0076] The same power supply system as in Example 1 is constituted as Example 2 by using a battery pack consisting of six unit batteries connected in series with three CGR18650DA (battery capacity 2.45Ah) and three HHR260SCP (battery capacity 2.6Ah). Here, only one of the unit cells of CGR18650DA (battery capacity 2.45Ah) has a charge capacity of 1Ah remaining, and the other five unit cells are fully discharged to form a battery pack. The forced discharge start voltage Va is set to 4.1 V, the forced discharge end voltage Vb is set to 3.9V.

Embodiment 3

[0078] The same power supply system as in Example 1 is constituted as Example 3 by using a battery pack consisting of seven unit batteries connected in series with two CGR18650DA (battery capacity 2.45Ah) and five HHR260SCP (battery capacity 2.6Ah). Here, only one of the unit cells of CGR18650DA (battery capacity 2.45Ah) has a charge capacity of 1Ah remaining, and the other six unit cells are fully discharged to form a battery pack. The forced discharge start voltage Va is set to 4.1 V, the forced discharge end voltage Vb is set to 3.9V.

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Abstract

A power supply system has at least one forced discharge section, which includes at least one aqueous solution secondary battery and at least one nonaqueous solution secondary battery having a smaller unit battery capacity as compared with the aqueous solution secondary battery and makes each nonaqueous secondary battery forcibly discharge electricity. The power supply system also has a control section, which measures the voltage of the nonaqueous solution secondary battery individually and makes each nonaqueous solution secondary battery forcibly discharge electricity by using the forced discharge section until the forced discharge end voltage is reached when the voltage of the nonaqueous solution secondary battery reaches a forced discharge start voltage Va.

Description

technical field [0001] The present invention relates to a battery system including a plurality of secondary batteries. Background technique [0002] Conventionally, two-wheeled vehicles, three-wheeled vehicles, and vehicles with four or more wheels have been equipped with lead-acid batteries for starting the power system and for driving circuits and electric appliances. Although the lead-acid storage battery is cheap, it has a large carrying weight and a large volume because of its low storage energy density. From the point of view of fuel consumption and power performance of the vehicle, it is required to reduce its weight and volume and reduce its size. As an improvement plan, it is proposed to use a nickel-cadmium secondary battery (nickel-cadmium secondary battery), nickel-hydrogen secondary battery (nickel-hydrogen secondary battery), lithium-ion secondary battery (lithiumion secondary battery) , Lithium-polymer secondary battery (lithium-polymer secondary battery) sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/02H01M10/44H01M16/00
CPCH01M10/441H01M16/00G01R31/362H02J2007/0067H02J7/0063H01M10/052G01R31/3658H01M10/342Y02T10/7011G01R31/396G01R31/3835Y02E60/10H02J7/007182
Inventor 杉山茂行青木护
Owner PANASONIC CORP