Charging equalization control circuit of battery pack

A technology for controlling circuits and charging circuits, applied in battery circuit devices, circuit devices, current collectors, etc., can solve problems such as low specific capacity, inability to effectively maintain physical and chemical properties of lithium iron phosphate batteries, and reduced battery capacity.

Active Publication Date: 2015-07-01
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the lithium iron phosphate battery is charged and discharged at a high rate, the actual specific capacity is low. Therefore, although the lithium iron phosphate battery has the above-mentioned advantages, it is used in the field of backup power, especially in the field of backup power for substations. Obviously, shallow charging and shallow discharging of lithium iron phosphate batteries cannot be effectively performed, and high-rate charging and discharging are prone to occur, so that the physical and chemical characteristics of lithium iron phosphate batteries cannot be effectively maintained.
[0004] When the physical and chemical properties of a certain battery change, there will be differences between the individual batteries in the battery pack, which will lead to over-discharge of some batteries in the long run
The same is true during the charging process. If you do not consider the difference between the battery cells and charge them, it may lead to overcharging of a single battery.
If a single battery is over-discharged or overcharged for a long time, its battery capacity will be reduced, its service life will be shortened, and the consistency of the entire battery pack will be destroyed, thereby shortening the battery pack's life.

Method used

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  • Charging equalization control circuit of battery pack
  • Charging equalization control circuit of battery pack
  • Charging equalization control circuit of battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] figure 1 It is a schematic structural diagram of a battery charge equalization control circuit provided in the embodiment of the present application.

[0041] The control circuit is used to control the charging process of the battery pack, so that the battery cells in the battery pack can achieve balanced charging, and for the battery pack, at least two battery cells are included. figure 1 Among them, 100 is a battery pack, 200 is a battery cell, and 300 is a power cord for charging the battery pack.

[0042] Such as figure 1 As shown, the control circuit includes: including: a charging circuit 1 , a voltage detection circuit 2 , a voltage comparator 3 , a controller 4 and a current equalizing circuit 5 .

[0043] The input end of the charging circuit 1 is connected to the power line 300, and the output end of the charging circuit 1 is respectively connected to at least two of the battery cells 200. The function of the charging circuit 1 is to convert the voltage on t...

Embodiment 2

[0063] In order to avoid energy loss caused by frequent detection of the battery cell voltage, in other embodiments of the present application, the interval time of detection can also be set during the charging process of different modes.

[0064] Figure 4 A schematic structural diagram of another charging equalization control circuit for battery packs based on changing the charging mode provided by the embodiment of the present application.

[0065] Such as Figure 4 As shown, the charge equalization control circuit may further include: a delay controller 6, the delay controller 4 is connected with the voltage detection circuit 2, and is used to control the detection interval of the voltage detection circuit.

[0066] When the average voltage is less than the first preset voltage threshold and the charging current is between 0.1C and 0.2C, a first delay instruction is generated and sent to the voltage detection circuit to control the voltage detection circuit 2 to delay the...

Embodiment 3

[0072] In the first embodiment above, it is possible to adjust the charging condition of the battery cell with a faster charging speed, but after the adjustment is completed, the charging condition of the battery cell will tend to be normal. , will again cause this cell to charge slower than the other cells.

[0073] For this reason, in the embodiment of this application, such as Figure 5 As shown, the controller 3 in the control circuit may also include: a second comparator 45 and a second flip-flop 46, wherein:

[0074] The second comparator 45 is connected with the voltage comparator 3, and is used for judging whether the voltage difference of the battery cells in the battery pack is less than a preset threshold, where the preset threshold takes into account the difference between the cells The difference is set, that is, the small difference between the battery cells is allowed;

[0075] The second trigger 46 is connected with the second comparator 45, and is used to ge...

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PUM

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Abstract

The invention discloses a charging equalization control circuit of a battery pack. The battery pack comprises at least two battery monomers. The charging equalization control circuit comprises a plurality of charging circuits connected with power lines and at least two battery monomers respectively, a voltage detection circuit connected with at least two battery monomers respectively, a voltage comparator connected with the voltage detection circuit, a controller connected with the voltage comparator and the charging circuits, and a current equalization circuit connected with the charging circuits and the controller. The charging equalization control circuit sets different charging modes or charging gears for the charging circuits, controls a charging situation according to voltage among the battery monomers in the battery pack, realizes more equalization among the battery monomers, and can reduce higher charging speeds of the battery monomers, so that a purpose of equalization charging of the battery monomers in the battery pack can be achieved.

Description

technical field [0001] The present application relates to the technical field of battery pack control, in particular to a battery pack charging equalization control circuit. Background technique [0002] Lithium iron phosphate battery is a new type of secondary power supply newly developed in recent years. Its main advantages are large input and output power, wide operating temperature range, no memory effect, long life of more than 2000 times, green environmental protection and floating charge characteristics. Outstanding features, widely used in the field of electric vehicles and energy storage power stations. [0003] However, when the lithium iron phosphate battery is charged and discharged at a high rate, the actual specific capacity is low. Therefore, although the lithium iron phosphate battery has the above-mentioned advantages, it is used in the field of backup power, especially in the field of backup power for substations. Obviously, shallow charging and shallow di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
Inventor 陈建胜陈达民夏传帮曹辉李昌静潘世奇周耀庭万晓陈长杰李矗李武潘鹏蔡延华周侃金林刘平关平
Owner STATE GRID CORP OF CHINA
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