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Protective semiconductor devices for batteries

A battery and protective technology, which is applied in the field of protective semiconductor devices, can solve the problems such as the disconnection of the connection between the battery and the protective semiconductor device that cannot be detected.

Inactive Publication Date: 2016-04-13
RICOH MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with this method as disclosed in Patent Document 1, disconnection of the connection between the secondary battery and the protective semiconductor device, which occurs when the secondary battery is used, cannot be detected

Method used

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  • Protective semiconductor devices for batteries
  • Protective semiconductor devices for batteries
  • Protective semiconductor devices for batteries

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0025] The first embodiment of the present invention relates to a protective semiconductor device that protects a plurality of secondary batteries connected in series, and has the following configuration.

[0026] The protective semiconductor device includes a voltage sensitive resistor connected in parallel with the battery to monitor the voltage. During a constant time interval, a resistor having a smaller resistance value than the voltage sensitive resistor is temporarily connected in parallel with the voltage sensitive resistor. If no disconnection occurs between the protective semiconductor device and the battery, no voltage fluctuation across the battery occurs at the connection terminal of the protective semiconductor device connected to the battery. Conversely, if a disconnection between the protective semiconductor device and the battery occurs, the voltage at the connection terminal disconnected from the battery fluctuates together with the fluctuation of the resista...

no. 2 example

[0072] If the device is connected via a low-pass filter as a strategy against noise, even due to the voltage generated across the resistance forming the low-pass filter during the open-circuit test, no open-circuit will occur / cause, but according to the first implementation of the present invention The protective semiconductor device of the example has a problem of erroneously detecting an open circuit between the storage battery and the protective semiconductor device. Therefore, the protective semiconductor device according to the second embodiment of the present invention is characterized in that erroneous detection is reduced by the comparator, and this feature will be realized in the following manner. By connecting the resistors in series to each of the voltage sensitive resistors of all batteries respectively, while the resistor with the smaller resistance value is temporarily connected in parallel to the voltage sensitive resistors, the inverting level / inversion of the c...

no. 3 example

[0184] If a circuit including a lower resistance value is connected in parallel to each of the storage batteries so that the voltages of the plurality of storage batteries are evened out, the protective semiconductor device according to the second embodiment of the present invention sometimes cannot properly perform the operation of detecting the disconnection . Therefore, the protective semiconductor device according to the third embodiment of the present invention can normally perform the operation of detecting the disconnection by disabling the resistance having a lower value when the disconnection is detected.

[0185] 3.1 Construction of Protective Semiconductor Devices

[0186] Figure 9 It is a schematic diagram of a protective semiconductor device 1 and a storage battery according to the third embodiment. Figure 10is a schematic diagram of the operation of the protective semiconductor device and the storage battery according to the third embodiment. like Figure 7...

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PUM

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Abstract

Provided is a protective semiconductor device that reliably detects an open circuit to a battery, comprising, for each battery: a battery connection terminal; a first resistor that detects the voltage of each battery; a comparator that detects each whether the voltage of the battery is within the reference voltage range; a series circuit consisting of the second resistance and the first switching element, and including a control circuit which controls the opening / closing of the switching element, wherein by turning on, the first switching element turns the second The resistance is connected to the connection terminal, and by turning it off, the control circuit maintains the disconnection test signal on while sequentially turning on the plurality of first switching elements, and based on the output signal from the comparator, detects between the battery and the connection terminal. The comparator corresponds to the opened first switching element.

Description

technical field [0001] The present invention relates to protective semiconductor devices for batteries. Background technique [0002] Easy-to-handle battery packs have been widely used in mobile electronic devices. Such battery packs are formed from assemblies / packages in which one or more batteries are included. A high-capacity battery such as a lithium ion battery, a lithium polymer battery, a nickel hydride battery, or the like is used as the storage battery. Because these high-capacity batteries have a large amount of energy therein, if overcharge, overdischarge, and excessive current, etc. are generated, it can evolve into high-temperature heat, which can lead to fire. [0003] Accordingly, protective semiconductor devices for preventing occurrence of overcharge, overdischarge, overcharge current, overdischarge current, short circuit current, abnormal overheating, etc. are included in the battery pack of the storage battery. Protective semiconductor devices also prev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02G01R19/165
CPCY02E60/10G01R19/16542H01M10/48G01R31/389H01M50/20
Inventor 大岛将史荒井邦章菅野纯一
Owner RICOH MICROELECTRONICS CO LTD