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Battery charging and discharging protection device and over-discharging protection method

A protection device, charging and discharging technology, applied in battery over-discharge protection, battery over-charge protection, battery circuit devices, etc., can solve problems such as insufficient compatibility and inability to guarantee battery life

Pending Publication Date: 2021-04-23
郑州万迪来电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a battery charge and discharge protection device and an over-discharge protection method to solve the technical problems that the existing battery management cannot guarantee battery life and lack compatibility

Method used

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  • Battery charging and discharging protection device and over-discharging protection method
  • Battery charging and discharging protection device and over-discharging protection method
  • Battery charging and discharging protection device and over-discharging protection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: a battery charge and discharge protection device, see figure 1 , intelligent battery management circuit BQ40Z50, the input terminal is connected to the battery pack, used to obtain the voltage and internal resistance of the battery pack, the upper two output terminals are respectively connected to the charge MOS (Q1) and discharge MOS (Q2), and the output terminal on the right is connected to the micro The input terminal of the controller and the output terminal of the microcontroller are connected to the input terminal of the MOS drive circuit, and the output terminal of the MOS drive circuit is connected to the gate of the main loop switch Q3. MOS transistor Q3 and diode D1 are connected in parallel, the drain of Q3 is connected to the cathode of D1 to form the first node, the source of Q3 is connected to the anode of D1 to form the second node, the first node is connected to the source of Q2, and the second node is connected to the anode of D1. The powe...

Embodiment 2

[0034] Example 2: The battery pack uses 4 sets of lithium-ion batteries in series (the cell model is Panasonic NCR18650GA, nominal voltage 3.6V), Q1 and Q2 use PSMN1R5-30YLC (Vds is 30V, on-resistance is 1.55mΩ), D1 Use PMEG060V100EPD (forward voltage drop 0.325V at 1A), Q3 uses IRFH7004 (Vds is 40V, on-resistance is 1.1mΩ), PCAK+ charging voltage is 16.8V, and the discharge undervoltage protection threshold set by the intelligent battery management circuit is 11V. When the battery voltage is lower than 11V during discharge, Q2 is turned off to prevent over-discharge. The charging overvoltage protection threshold is 16.5V. When the battery voltage is higher than 16.5V during charging, Q1 is turned off to prevent overcharging. When the intelligent battery management circuit detects that the battery voltage is 16.4V, it indicates that the charging is about to be completed. At this time, Q3 is cut off to take step-down charging to prolong the battery life.

[0035]The internal c...

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Abstract

The invention discloses a battery charging and discharging protection device and an over-discharging protection method, and aims to solve technical problems that the service life of a battery cannot be ensured and the compatibility is insufficient in the conventional battery management. The device comprises a battery management module, a control module, a switch module and a voltage division module, the switch module and the voltage division module are connected in parallel to form a first node and a second node, the first node is connected with a protected battery, the second node is connected with a discharge port / charge port, and the input terminal of the battery management module is connected with the battery. And the output terminal of the battery management module is correspondingly connected with the input terminal of the control module, the switch module comprises a switch control terminal correspondingly connected with the control module, and the switch module is conducted to enable the voltage division module to be short-circuited. The battery charging and discharging protection device has the beneficial effects that the lithium ion battery is high in compatibility, the service life of the battery is prolonged, and overcharge and overdischarge are better prevented.

Description

technical field [0001] The invention relates to the technical field of power supply protection, in particular to a battery charge and discharge protection device and an over-discharge protection method. Background technique [0002] Lithium-ion batteries have many advantages such as higher energy density, higher battery voltage, less self-discharge, longer cycle life, and environmental protection. They are widely used in various electronic products, but compared with lithium iron phosphate batteries, The life (number of cycles) is too short, which causes a lot of waste, so it is of great significance to improve its service life. [0003] Volume 2 of "Science and Technology Information" in 2009 recorded "Charging methods to extend the life of lithium batteries". The cycle life of lithium batteries can be improved by reducing the charging voltage and selecting an appropriate charging termination current. "Automotive Technology" 2016 Issue 03 published The "Influence of Discha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02H7/18
CPCH02J7/00302H02J7/00306H02H7/18
Inventor 徐鹏李文举
Owner 郑州万迪来电子技术有限公司