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A battery pack main circuit interface protection circuit and protection method

A loop protection and interface protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of lack of interface protection function, poor safety and abuse resistance.

Active Publication Date: 2016-10-05
BEIJING KEY POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

figure 1 Shown is the high-voltage electrical schematic diagram in a traditional battery pack, which lacks interface protection functions and has poor safety and abuse resistance

Method used

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  • A battery pack main circuit interface protection circuit and protection method
  • A battery pack main circuit interface protection circuit and protection method
  • A battery pack main circuit interface protection circuit and protection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: A main circuit interface protection circuit of a battery pack, including four parts: a circuit protection resistor 8 , a circuit protection switch 9 , a current sensor 5 and an electronic controller 7 . Among them, the loop protection resistor 8 is connected in series with the loop protection switch 9, and the loop protection resistor 8 and the loop protection switch 9 are connected in parallel at both ends of a DC contactor (called: protected contactor 4), and the loop protection switch 9 is controlled by an electronic controller. 7 control, the current sensor 5 is connected in series with the circuit protection resistor 9, and the output terminal of the current sensor 5 is connected with the electronic controller 7.

[0014] The protection method of this protection circuit is: use the protected contactor 4 as the last closed contactor when outputting power on the main circuit of the battery pack, after the main circuit interfaces 10 and 11 of the battery ...

Embodiment 2

[0015] Embodiment 2: A main circuit interface protection circuit of a battery pack, including four parts: a circuit protection resistor 8 , a circuit protection switch 9 , a voltage sensor 6 and an electronic controller 7 . It is characterized in that: the circuit protection resistor 8 is connected in series with the circuit protection switch 9, the circuit protection resistor 8 and the circuit protection switch 9 are connected in parallel at both ends of a DC contactor (called: the protected contactor 4), and the circuit protection switch 9 Controlled by the electronic controller 7 , the voltage sensor 6 is connected in parallel with the circuit protection resistor 9 , and the output terminal of the voltage sensor 6 is connected with the electronic controller 7 .

[0016] The protection method of this protection circuit is: use the protected contactor 4 as the last closed contactor when outputting power on the main circuit of the battery pack, after the main circuit interfaces...

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PUM

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Abstract

A battery pack main circuit interface protection circuit and protection method, comprising: a circuit protection resistor 8, a circuit protection switch 9, a measurement circuit and an electronic controller 7. It is characterized in that: the loop protection resistor 8 and the loop protection switch 9 are connected in parallel at both ends of the protected contactor 4 after being connected in series, the loop protection switch 9 is controlled by the electronic controller 7, and the measuring circuit can be a current sensor 5 connected in series with the loop protection resistor 8 , or a voltage sensor 6 connected in parallel with the circuit protection resistor 8 or the protected contactor 4, and the output terminal of the measurement circuit is connected with the electronic controller 7. When the protected contactor 4 is disconnected, the circuit protection switch 9 is turned on, and the electronic controller 7 judges whether the external load of the main circuit meets the requirements of the battery pack according to the current or voltage signal output by the measurement circuit. It can prevent the overcurrent caused by the external short circuit, prevent the ablation of the protected contactor 4 caused by the excessive initial current of the circuit, and improve the safety and abuse resistance of the battery pack.

Description

technical field [0001] The invention relates to an electrical interface protection device and method, belonging to the technical field of power circuit interface protection. Background technique [0002] As a representative of new energy vehicles, electric vehicles have received more and more attention due to their cleanliness and economy. Electric vehicles use high-voltage battery packs to provide DC power to drive the vehicle. For example, the power battery packs used in electric cars generally have about 20kWh of electric energy, and the battery packs with a total voltage of about 300V formed in series are mostly used, and the output current can reach 300A. High-voltage battery packs for electric vehicles place higher demands on both electrical safety and switching devices. In particular, the swappable battery pack has a lot of time in the storage and charging process of leaving the vehicle during the entire working cycle, and is often connected to the vehicle electrical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/18
Inventor 李立国华剑锋田硕
Owner BEIJING KEY POWER TECH