Battery protection circuit

A technology for protecting circuits and batteries, which is applied in battery disconnect circuits, battery circuit devices, safety/protection circuits, etc., can solve problems such as affecting battery life, easy to enter over-discharge state, etc., and achieve the effect of saving power consumption

Pending Publication Date: 2020-03-27
SHENZHEN AMPOWER NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is a low-capacity battery, it will easily enter the over-discharge state after a long storage and transportation time, which will affect the service life of the battery. Deep over-discharge will also pose a safety risk.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] refer to figure 2 , shows the circuit principle diagram of the battery protection circuit in this embodiment.

[0021] Such as figure 2 As shown, the battery protection circuit includes a battery cell, a positive pole B+ of the battery cell, a negative pole B- of the battery cell, a protection circuit, a positive terminal P+ of the protection circuit, and a negative terminal P- of the protection circuit.

[0022] Wherein, the positive terminal B+ of the battery cell and the positive terminal P+ of the protection circuit are not the same port.

[0023] The positive terminal B+ of the battery cell and the positive terminal P+ of the protection circuit are respectively used to connect with the positive terminal of the external device.

[0024] The negative pole B- of the battery cell is connected to the protection circuit.

[0025] The negative terminal P of the protection circuit is used to connect with the negative terminal of the external equipment.

[0026] from ...

Embodiment 2

[0029] Based on embodiment one, refer to image 3 , shows a specific circuit diagram of the battery protection circuit in the first embodiment.

[0030] Among them, CELL is the battery, except for the battery CELL, other circuits are on the protection board.

[0031] Taking lithium battery as an example, the protection functions of the battery protection circuit are described below:

[0032] (1) Overcharge protection function:

[0033] When the battery is charging, when the chip U1 detects that the voltage of the cell CELL reaches the overcharge protection voltage (4.28±0.02V) and the duration reaches the overcharge detection delay time (960~1400mS) through the pin VDD, the chip U1 passes the pin VDD. The pin CO sends a signal to the double-section MOS transistor Q1, and then the double-section MOS transistor Q1 will disconnect the connection between the negative terminal B- of the battery cell and the negative terminal P- of the protection circuit, and the battery will not ...

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Abstract

The invention discloses a battery protection circuit, and relates to the field of battery protection. The battery protection circuit comprises a battery cell, a battery cell anode, a battery cell cathode, a protection circuit, a protection circuit anode port and a protection circuit cathode port. The anode of the battery cell and the anode port of the protection circuit are not the same port; theanode of the battery cell and the anode port of the protection circuit are respectively used for being connected with the anode port of external equipment; the cathode of the battery cell is connectedwith the protection circuit; and the cathode of the protection circuit is used for being connected with a cathode port of external equipment. Under the condition that external equipment is not connected, the anode B + of the battery cell and the anode port P + of the protection circuit are disconnected, a current loop cannot be formed, and electric energy cannot be consumed. Only when external experiment is connected, the cell is completely connected with the protection circuit, and electric energy is consumed. Therefore, the power consumption of the battery is saved.

Description

technical field [0001] The invention relates to the field of battery protection, in particular to a battery protection circuit. Background technique [0002] In the prior art, the battery is mainly composed of a battery cell, a protective plate and a casing. Both the battery cell and the protective plate have static consumption. The battery cell is very small, and the static consumption of the protective plate is relatively large. After the battery is made, as long as the battery is connected to the protection board, it will always be in a state of power consumption, mainly due to the power consumption of the battery protection board. If it is a low-capacity battery, it is easy to enter the over-discharge state after a long storage and transportation time, which will affect the service life of the battery, and deep over-discharge will also pose a safety risk. Contents of the invention [0003] The present invention aims to solve at least one of the technical problems exis...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H02J7/00H02H7/18
CPCH02J7/0031H02H7/18
Inventor伍兵兵莫敏聪
OwnerSHENZHEN AMPOWER NEW ENERGY CO LTD