SECONDARY BATTERY PROTECTION CIRCUIT and control method thereof, SECONDARY BATTERY PROTECTION APPARATUS AND BATTERY PACK

A secondary battery and protection circuit technology, which is applied in secondary battery charging/discharging, secondary battery repair/maintenance, secondary battery, etc., can solve problems such as the reduction of charging efficiency of secondary battery 113, and achieve the goal of suppressing charging efficiency Reduced effect

Active Publication Date: 2020-12-01
MITSUMI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the charge pump 121 repeatedly starts and stops until "VB>VcpL", which may result in a decrease in charging efficiency of the secondary battery 113

Method used

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  • SECONDARY BATTERY PROTECTION CIRCUIT and control method thereof, SECONDARY BATTERY PROTECTION APPARATUS AND BATTERY PACK
  • SECONDARY BATTERY PROTECTION CIRCUIT and control method thereof, SECONDARY BATTERY PROTECTION APPARATUS AND BATTERY PACK
  • SECONDARY BATTERY PROTECTION CIRCUIT and control method thereof, SECONDARY BATTERY PROTECTION APPARATUS AND BATTERY PACK

Examples

Experimental program
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Effect test

Embodiment Construction

[0092] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0093] figure 2 It is a figure showing the structure of the battery pack in 1st Embodiment. figure 2 The illustrated battery pack 100 includes a secondary battery 70 and a battery protection device 80 inside.

[0094] The secondary battery 70 is an example of a chargeable and dischargeable battery. The secondary battery 70 supplies electric power to a load 90 connected to the positive terminal 5 (P+ terminal) and the negative terminal 6 (P− terminal). The secondary battery 70 can be charged by a charger 91 connected to the positive terminal 5 and the negative terminal 6 . Specific examples of the secondary battery 70 include lithium ion batteries, lithium polymer batteries, and the like. The battery pack 100 can be built-in or external to the load 90 .

[0095] The load 90 is an example of a load powered by the secondary battery 70 of the battery pack 100 . Spec...

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Abstract

The invention provides a secondary battery protection device, a protection circuit and a control method thereof, and a battery pack. The purpose of the present invention is to suppress a decrease in the charging efficiency of a low-voltage secondary battery. The secondary battery protection circuit protects a secondary battery by using a charge control NMOS transistor and a discharge control NMOStransistor that are inserted in series in a current path between a positive electrode of the secondary battery and a load and a high-potential-side power supply terminal of a charger. The secondary battery protection circuit includes: a low voltage detection circuit that detects a voltage of the secondary battery that is lower than a low voltage detection voltage set lower than an overdischarge detection voltage; and a switching circuit that fixes the gate of the charge control NMOS transistor at the potential of the high-potential-side power supply terminal when the low-voltage detection circuit detects a voltage of the secondary battery that is lower than a low-voltage detection voltage.

Description

technical field [0001] The invention relates to a secondary battery protection circuit, a secondary battery protection device, a battery pack and a control method for the secondary battery protection circuit. Background technique [0002] Conventionally, there is known a pair of NMOS (N-channel Metal Oxide Semiconductor) inserted in series in the current path between the positive terminal of the secondary battery and the load and the positive terminal connected to the high potential side power supply terminal of the charger. ) transistor to protect the protection circuit of the secondary battery (for example, see Patent Document 1). [0003] figure 1 It is a circuit diagram of a conventional battery pack disclosed in Patent Document 1. figure 1 The illustrated battery pack has a secondary battery 113 , a protection circuit 117 for protecting the secondary battery 113 , and terminals 111 , 112 to which unillustrated charging means and load means are connected. The protecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/18H02J7/00H01M50/574
CPCH02H7/18H02J7/0031H01M50/574H01M10/48Y02E60/10H02J2207/10H02J7/0036H01M10/42H01M2010/4271H01M2200/00H02J7/00306H02J7/00304H02J7/00302H01M10/44
Inventor 武田贵志
Owner MITSUMI ELECTRIC CO LTD
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