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Blocking-type PTC-based battery protection device and method thereof

A technology of battery protection device and lithium battery pack, applied in battery circuit device, circuit device, safety/protection battery circuit, etc., to achieve the effect of simple design

Pending Publication Date: 2018-10-09
樊朝晖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a battery protection device and method based on a blocking PTC, which has the characteristics of simplicity, reliability and professionalism, so as to solve the problem of lithium batteries under safe voltage. Dynamic Consistency and Reliability Issues

Method used

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  • Blocking-type PTC-based battery protection device and method thereof
  • Blocking-type PTC-based battery protection device and method thereof
  • Blocking-type PTC-based battery protection device and method thereof

Examples

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Effect test

Embodiment 1

[0049] see figure 1 As shown, a battery protection device based on a blocking PTC of the present invention is composed of a blocking PTC1, an equalization unit and a total voltage monitoring unit 3; Among them, the balancing unit includes several balancing resistors 4 and several MOS switches 5, and the numbers of the balancing resistors 4 and the MOS switches 5 are equal to the number of series cells 6 in the lithium battery pack, Each of the equalizing resistors 4 is attached to one side of the blocking PTC1, and each of the equalizing resistors 4 is respectively connected across the two ends of the corresponding cell 6 through a MOS switch 5 ; The monitoring signal pins of the total voltage monitoring unit 3 are respectively connected to both ends of each of the batteries 6 , and the control signal pins of the total voltage monitoring unit 3 are respectively connected to each of the MOS switches 5 .

Embodiment 2

[0051] see figure 2 As shown, a battery protection device based on a blocking PTC of the present invention is composed of a blocking PTC1, an equalization unit and a total voltage monitoring unit 3; Among them, the balancing unit includes several balancing resistors 4 and several MOS switches 5, and the numbers of the balancing resistors 4 and the MOS switches 5 are equal to the number of series cells 6 in the lithium battery pack, Each of the equalizing resistors 4 is attached to one side of the blocking PTC1, and each of the equalizing resistors 4 is respectively connected across the two ends of the corresponding cell 6 through a MOS switch 5 , the other side of the blocking PTC1 is pasted with a heat sink 7; the monitoring signal pins of the total voltage monitoring unit 3 are respectively connected to both ends of each of the battery cells 6, and the total voltage monitoring The control signal pins of the unit 3 are respectively connected to each of the MOS switches 5 . ...

Embodiment 3

[0053] see image 3 As shown, a battery protection device based on a blocking PTC of the present invention is composed of a blocking PTC1, an equalization unit, a bridge-off magnetic latching relay 2 and a total voltage monitoring unit 3; the blocking PTC1 and the The off-bridge type magnetic latching relay 2 is respectively connected in series in the charging and discharging main circuit of the lithium battery pack, and the equalizing unit includes several equalizing resistors 4 and several MOS switches 5, and the equalizing resistors 4 and the MOS switches 5 The number is equal to the number of series cells 6 in the lithium battery pack, each of the equalizing resistors 4 is attached to one side of the blocking PTC1, and each of the equalizing resistors 4 passes through One of the MOS switches 5 is connected across the two ends of the corresponding battery core 6, and the other side of the blocking PTC1 is covered with a heat sink 7; the monitoring signal pin of the total vo...

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Abstract

The invention discloses a blocking-type PTC-based battery protection device and a method thereof. The device comprises a blocking-type PTC, an equalization unit and a total voltage monitoring unit, wherein the blocking-type PTC is serially connected in a charge and discharge main circuit of a lithium battery pack; the equalization unit internally comprises a plurality of equalization resistors controlled by MOS switches; each equalization resistor is in bridge connection onto two ends of a corresponding cathode mix and is laminated at one side of the blocking-type PTC; and the total voltage monitoring unit is connected with each cathode mix and each MOS switch. In the method, the high-voltage cathode mix is equalized through heating of the bypass equalization resistor, and consistency is equalized; the equalization energy is made full use of to actively heat the blocking-type PTC, the internal resistance is increased dramatically, the charge current is thus suppressed, and overcharge protection is realized. The blocking-type PTC-based battery protection device and the method thereof have the characteristics of simple structure, safety, reliability and low cost, the problems of dynamic consistency and reliability of the lithium battery under safe voltage can be effectively solved, and the life time of the battery is enhanced.

Description

technical field [0001] The invention belongs to the technical field of lithium battery protection, and in particular relates to a battery protection device based on a blocking PTC and a method thereof. Background technique [0002] As the most important energy carrier in this century, lithium battery is an indispensable product of new energy technology. For lithium batteries, due to the development of technology, their rate capability and energy density are increasing rapidly, but looking at the safety management methods of lithium batteries adopted today, they have not made breakthrough progress. The safety management of lithium batteries has become a worldwide problem recognized by the industry. [0003] The reason is that the cell technology and process characteristics of lithium batteries determine that each cell cannot be completely consistent, which leads to the irreconcilability of lithium battery theory and its application. Since lithium batteries are combined and ...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0026H02J7/0019
Inventor 樊朝晖王占伟戴鹏飞孙敏南
Owner 樊朝晖
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