Overcurrent detection, protection circuit and battery

An overcurrent detection and circuit technology, applied in battery overcurrent protection, safety/protection circuits, emergency protection circuit devices, etc., can solve problems such as inaccurate overcurrent protection, and achieve accurate overcurrent protection.

Active Publication Date: 2018-08-28
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The embodiment of the present application proposes an overcurrent detection, protection circuit and battery to solve the technical problem in the prior art that the overcurrent protection threshold changes with the battery voltage, resulting in inaccurate overcurrent protection

Method used

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  • Overcurrent detection, protection circuit and battery
  • Overcurrent detection, protection circuit and battery
  • Overcurrent detection, protection circuit and battery

Examples

Experimental program
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Effect test

Embodiment 1

[0042] image 3 shows the schematic structure of the overcurrent detection circuit in the embodiment of the present application Figure II , as shown in the figure, the overcurrent detection circuit in the embodiment of the present application may include a mirror current source circuit, a main current circuit, a first branch, a second branch, a comparison circuit and an overcurrent compensation circuit, and the mirror current source The circuit is respectively connected to the first end of the main current circuit, the first end of the first branch and the first end of the second branch, and the current of the main current circuit is controlled by the mirror current source circuit Mirrored to the first branch and the second branch, the comparison circuit is used to detect the current of the first branch and the second branch and output the comparison result, the first of the overcurrent compensation circuit end and the first end of the first branch, the first end of the comp...

Embodiment 2

[0069] The overcurrent protection circuit proposed in the embodiment of this application may include a switch protection circuit and a battery protection chip including the above-mentioned overcurrent detection circuit. The switch protection circuit may include a first switch circuit and a second switch circuit. The battery protection The first output terminal DOUT of the chip is connected to the first switch circuit, and the second output terminal COUT of the battery protection chip is connected to the second switch circuit;

[0070] When the overcurrent detection circuit detects that the discharge current exceeds the overcurrent protection threshold, the output of the first output terminal DOUT is an abnormal discharge protection signal, and the first switch circuit disconnects the discharge circuit of the battery protection chip;

[0071] When the overcurrent detection circuit detects that the charging current exceeds the overcurrent protection threshold, the output of the s...

Embodiment 3

[0075] The battery proposed in the embodiment of the present application may include a battery cell, a housing, and the above-mentioned overcurrent protection circuit. The positive pole B+ of the battery cell is connected to the first external connection terminal P+, and the negative pole B- of the battery cell is connected to the second external The connection terminal P- is connected, and the first power supply terminal VDD of the battery protection chip is connected through R 1 It is connected to the positive pole B+ of the battery cell and the first external connection terminal P+, and the second power supply terminal VSS of the battery protection chip is connected to the second external connection terminal P−.

[0076] The battery provided by the embodiment of the present application ensures the safety and durability of the battery because the overcurrent protection threshold in the overcurrent protection circuit does not change with the change of the power supply voltage....

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Abstract

The present application provides an overcurrent detection circuit, an overcurrent protection circuit and a battery. The overcurrent detection circuit comprises a mirror current source circuit, a main current circuit, a first subcircuit, a second subcircuit, a comparison circuit and an overcurrent compensation circuit, wherein the mirror current source circuit is connected with a first end of the main current circuit, a first end of the first subcircuit and a first end of the second subcircuit; the comparison circuit is used for detecting currents of the first subcircuit and the second subcircuit and outputting a comparison result; one end of the overcurrent compensation circuit is connected with one end of the first subcircuit and a first end of the comparison circuit at a first connecting point, and the other end is connected with one end of the second subcircuit and a second end of the comparison circuit at a second connecting point; and the overcurrent compensation circuit comprises a first current subcircuit, a second current subcircuit and a current adjusting subcircuit, the first current subcircuit and the second current subcircuit mirror a current, changing along with a power supply, of the current adjusting subcircuit, the first current subcircuit extracts a copy circuit from the first connecting point, and the second subcircuit extracts a copy circuit from the second connecting point. By adopting the overcurrent detection circuit, the overcurrent protection circuit and the battery, overcurrent protection can be ensured to be more accurate.

Description

technical field [0001] The present application relates to the technical field of battery safety, in particular to an overcurrent detection and protection circuit and a battery. Background technique [0002] Lithium batteries are more and more used in various electronic products due to their small size, high energy density, no memory effect, low self-discharge rate, and many cycles. However, during the application process, overcharge, overdischarge, overcurrent, and short circuit will cause irreversible damage to the lithium battery, resulting in shortened life and even explosion. Therefore, the lithium battery must be used with a lithium battery protection chip. [0003] Generally, lithium battery protection chips have overcharge, overdischarge, overcurrent, and short circuit protection functions. The lithium battery protection chip monitors the battery voltage and charge and discharge current information, and when the protection threshold is reached, the corresponding char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H02H7/18H01M10/48
CPCH01M10/48H02H7/18H02J7/00304H02J7/0031H02J7/0036Y02E60/10
Inventor 姜伟田文博王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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