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Storage battery voltage balancing device

A battery voltage and balancing device technology, applied in battery circuit devices, circuit devices, collectors, etc., can solve problems such as battery damage, achieve real-time control, low noise, and ensure accuracy

Active Publication Date: 2015-01-21
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although regular equalizing charging of the battery pack can alleviate this situation, some batteries are already in an undercharged state at this time. Only undercharged batteries can be fully charged, which is also harmful to overcharged batteries

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0026] figure 1 A storage battery voltage balancing device is shown, including a storage battery charging control circuit connected to a single-chip microcomputer;

[0027] The storage battery management chip is connected with the single-chip microcomputer through the SPI bus;

[0028] Battery voltage acquisition circuit: multiple batteries connected in series form a battery pack, and the positive pole of each battery in the battery pack is connected to the battery management chip;

[0029] Battery discharge control circuit: the positive pole of each battery is connected to the source S of a P-type MOSFET, the negative pole of the battery is connected in series with a discharge resistor and then connected to the drain D of the P-type MOSFET, and the gate G of the P-type MOSFET Connect with the battery management chip (see image 3 , Figure 4 ). image 3 Among them, the negative pole of battery B12 is connected to the pin GND of LTC6802. The single-chip microcomputer mode...

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PUM

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Abstract

The invention discloses a storage battery voltage balancing device and belongs to intelligent charging and discharging control devices of storage battery packs for direct-current power sources in an electrical power system. A storage battery charging control circuit is connected with a single chip, a storage battery managing chip is connected with the single chip via an SPI (serial peripheral interface) bus. In a storage battery voltage acquisition circuit, a storage battery pack is formed by a plurality of storage batteries which are mutually serially connected, and a positive electrode of every storage battery in the storage battery pack is connected with the storage battery managing chip. In a storage battery discharging control circuit, the positive electrode of every storage battery is connected with a source electrode D of a P-type MOSFET (metal-oxide -semiconductor field effect transistor), and the negative electrode of every storage battery is connected with the storage battery managing chip. During discharging, only overcharged batteries are discharged; and during charging, only batteries with low capacities are charged. The storage battery voltage balancing device is small in size, low in noise, high in reliability and real-time in control.

Description

technical field [0001] The invention relates to a battery pack charging device, in particular to an intelligent device for voltage detection and voltage equalization charging and discharging of series battery packs such as lead-acid batteries, lithium batteries, and nickel-cadmium batteries. Background technique [0002] Battery packs are used in systems such as electric power supply, communication power supply, UPS power supply, etc., and the battery pack must be online, and must be in a floating charging state during normal operation. Similarly, long-term floating charging will cause some batteries in this group to have a large capacity and some batteries to have a small capacity, and the capacity of the battery pack is equal to the capacity of the smallest battery in this group; the battery pack cannot be discharged when the accident discharges Nominal capacity. Due to the existence of the floating charge voltage, all the batteries in the battery pack are always in a cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
Inventor 李晶李杲张仲罗文科裴浩苟剑周登勇许昭德
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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