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Energy balancing and charging protection circuit of multi-string combined rechargeable battery

A charging protection and energy balancing technology, applied in charge balancing circuits, battery circuit devices, safety/protection circuits, etc., can solve problems such as large leakage current of Zener diodes, and achieve the effects of improving reliability, reducing costs and low costs

Inactive Publication Date: 2019-04-26
上海德朗能动力电池有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Solve the problem of excessive leakage current of the Zener diode in the field where the characteristic value of the reverse breakdown voltage is close to the working voltage of the single battery, and give full play to its advantages of low cost and high reliability as a shunt element

Method used

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  • Energy balancing and charging protection circuit of multi-string combined rechargeable battery
  • Energy balancing and charging protection circuit of multi-string combined rechargeable battery
  • Energy balancing and charging protection circuit of multi-string combined rechargeable battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] circuit diagram see figure 2

[0048] 【Lithium Iron Phosphate 48V15 Series Battery Pack System】

[0049] Connect 15 1.5Ah 3.2V lithium iron phosphate 18650 batteries in series to form a battery pack with a nominal voltage of 48V, and then connect 14 Zener diodes (1N4737A, Vz typical value 7.5V) to the battery pack in the following way:

[0050] The negative pole of the first Zener diode D1 is connected to the positive pole of the first battery unit B1 starting from the + terminal of the battery pack, and the positive pole is connected to the negative pole of the second battery unit B2 starting from the + terminal of the battery pack;

[0051] The negative pole of the second Zener diode D2 is connected to the positive pole of the second battery unit B2 starting from the + terminal of the battery pack, and the positive pole is connected to the negative pole of the third battery unit B3 starting from the + terminal of the battery pack;

[0052] …

[0053] The negative ...

Embodiment 2

[0094] 【Lithium Iron Phosphate 48V15 Series Battery Pack System】

[0095] Compared with embodiment 1, this embodiment 2 adopts more shunts.

[0096] Connect 15 1.5Ah 3.2V lithium iron phosphate 18650 batteries in series to form a battery pack with a nominal voltage of 48V, and then connect 12 zener diodes (1N4737A, Vz typical value 7.5V) to the battery pack in the following way:

[0097] The negative pole of the first Zener diode D1 is connected to the positive pole of the second battery unit B2 starting from the + terminal of the battery pack, and the positive pole is connected to the negative pole of the third battery unit B3 starting from the + terminal of the battery pack;

[0098] The negative pole of the second Zener diode D2 is connected to the positive pole of the third battery unit B3 starting from the + terminal of the battery pack, and the positive pole is connected to the negative pole of the fourth battery unit B4 starting from the + terminal of the battery pack; ...

Embodiment 3

[0104] 【Lithium manganese oxide 11V 3-series battery pack system】

[0105] Connect three 1.5Ah 3.7V lithium manganate 18650 batteries in series to form a battery pack with a nominal voltage of 11V, and then connect two Zener diodes (1N4738A, Vz typical value 8.2V) to the battery pack in the following way:

[0106] The negative pole of the first Zener diode D1 is connected to the positive pole of the first battery unit B1 starting from the + terminal of the battery pack, and the positive pole is connected to the negative pole of the second battery unit B2 starting from the + terminal of the battery pack;

[0107] The negative pole of the second Zener diode D2 is connected to the positive pole of the second battery unit B2 starting from the + terminal of the battery pack, and the positive pole is connected to the negative pole of the third battery unit B3 starting from the + terminal of the battery pack;

[0108] Will 2 figure 1 The shown shunt circuit A (regulated voltage valu...

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Abstract

The invention discloses an energy balancing and charging protection circuit of multi-string combined rechargeable battery, and belongs to the field of balanced charging of series battery packs. A negative pole of a voltage-stabilizing diode is connected to a positive pole of a battery unit starting from the + end of a battery pack, the positive pole is connected to the negative pole of another adjacent or spaced battery unit, a plurality of voltage-stabilizing diodes form a network, and shunt circuits are arranged at the two ends of the battery pack. By utilizing the characteristic that a reverse breakdown phenomenon occurs when a reverse voltage of the voltage stabilizing diode reaches a certain specific value, the charging current is shunted near a charging upper limit voltage, so that the balanced state that the voltage of each unit is basically consistent is achieved, and meanwhile, the purpose of preventing the batteries from being overcharged can be achieved. According to the scheme, the problem of overlarge leakage current caused by the fact that voltage stabilizing diodes with low reverse breakdown voltage characteristic values are directly connected in parallel with the battery units is solved, compared with a prior scheme, the cost is reduced, and the reliability is improved. The greater the number of series units in the combination, the more significant the cost reduction effect is.

Description

technical field [0001] The invention relates to the field of balanced charging of series battery packs, in particular to energy balancing and charging protection circuits for multi-string combined rechargeable batteries. Background technique [0002] Rechargeable batteries are widely used in energy storage and supply in electronic equipment, power, energy storage and other fields. In order to meet the requirements of the application field, it is usually necessary to combine the batteries in series to increase the voltage of the battery pack and achieve the purpose of matching with the electrical appliances. [0003] Due to the differences in the capacity and self-discharge characteristics of each battery unit, the state of charge of each battery unit connected in series may be unbalanced during use. If it is not controlled, the performance of the battery pack will be damaged or even a safety hazard sexual issues. Therefore, except nickel-cadmium, nickel-metal hydride and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0014H02J7/0029
Inventor 高学锋吕成学赵文娟吴江峰陈瑶
Owner 上海德朗能动力电池有限公司