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Battery protection circuit

A technology for protecting circuits and batteries, applied in battery overcharge protection, battery circuit devices, battery overdischarge protection, etc., can solve the problems of power consumption, large loop resistance, poor reversibility of secondary protection circuits, etc.

Inactive Publication Date: 2017-09-26
BMTPOW LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of large loop resistance, power consumption and poor reversibility of the secondary protection circuit in the existing battery protection circuit, the present invention provides a battery protection circuit, which can be applied to the primary protection and secondary protection of the battery , reducing the number of switches in the loop, thereby reducing the loop resistance, no need to add PTC or fuse in the loop for secondary protection, to achieve recoverable secondary protection, and the recovery speed is fast

Method used

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Embodiment approach

[0044] like Figure 5 As shown, the controllable switch 4 is an N-type MOS transistor, including G pole, S pole and D pole, the S pole of the controllable switch 4 is connected to the negative terminal 6, and the D pole is connected to the positive terminal 5, The G pole is connected to the control module 21. When the control module 21 inputs a control signal, the current from the D pole to the S pole is turned on, that is, the current from the positive terminal 5 to the negative terminal 6 is turned on.

[0045] like Image 6 As shown, the controllable switch 4 is a P-type MOS tube, including G pole, S pole and D pole, the S pole of the controllable switch 4 is connected to the positive terminal 5, and the D pole is connected to the negative terminal 6, The G pole is connected to the control module 21. When the control module 21 inputs a control signal, the current from the S pole to the D pole is turned on, that is, the current from the positive terminal 5 to the negative t...

Embodiment 1

[0055] The battery protection circuit disclosed by the invention can be set as a secondary protection circuit.

[0056] see figure 2 As shown, in this embodiment, a battery protection circuit is disclosed, which consists of a battery pack 1, a BMS main control unit 2, a charging MOS tube 8, a first discharging MOS tube 3, a second discharging MOS tube 7, a controllable switch 4. Positive terminal 5 and negative terminal 6 constitute;

[0057] The first discharge MOS transistor 3 is connected in series with the battery pack 1 between the positive terminal 5 and the negative terminal 6, and the first discharge MOS transistor 3 is used to control the on-off of the output current of the battery pack 1;

[0058] Both ends of the controllable switch 4 are connected between the positive terminal 5 and the negative terminal 6, and the series circuit composed of the battery pack 1 and the first discharge MOS transistor 3 is connected in parallel with the controllable switch 4, the T...

Embodiment 2

[0070] see Figure 4 As shown, this embodiment discloses a battery protection circuit, most of the implementation of the battery protection circuit is the same as that of Embodiment 1, the difference lies in:

[0071] The battery protection circuit also includes a current detection resistor 9, which is connected in series with the battery pack 1 to obtain the current flowing through the current detection resistor 9; the detection module 22 includes a current analog-to-digital converter 222, The current analog-to-digital converter 222 is preferably a fuel gauge; the current analog-to-digital converter 222 is connected to the current detection resistor 9 and the control module 21 respectively, and is used to convert the obtained current analog signal into a current digital signal, and convert the obtained current analog signal to a current digital signal. The current digital signal is transmitted to the control module 21.

[0072] The battery protection circuit also includes a ...

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Abstract

The invention provides a battery protection circuit, and the circuit comprises a battery pack, a BMS main control unit, a first discharge MOS tube, a controllable switch, a positive end, and a negative end. The first discharge MOS tube and the battery pack are connected between the positive end and the negative end in a series manner, and the first discharge MOS tube is used for controlling the on / off of an output current of the battery pack. Two ends of the controllable switch are connected between the positive end and the negative end, and a series circuit which is formed by the battery pack and the first discharge MOS tube is connected with the controllable switch in a parallel manner. The BMS main control unit comprises a control module and a detection module, wherein the detection module is used for detecting the state information of the battery pack and transmitting the state information to the control module, and the control module is connected with the first discharge MOS tube and the controllable switch. The circuit provided by the invention aims at solving problems that a conventional battery protection circuit is large in loop resistance, is large in power consumption and is poor in reversibility of a secondary protection circuit.

Description

technical field [0001] The invention relates to a battery protection circuit. Background technique [0002] With the technological development of products such as electric vehicles and notebook computers, the requirements for power supplies are also getting higher and higher. The battery protection circuit is a control circuit between the battery, the load, and the charger, which is beneficial to improve the utilization rate of the battery, prevent the battery from overcharging and overdischarging, prolong the service life of the battery, and monitor the state of the battery. In the prior art, the battery protection circuit basically adopts the series connection of charging MOS tube and discharging MOS tube (MOS tube, Metal-Oxide-Semiconductor Field-Effect Transistor, Metal-Oxide-Semiconductor Field-Effect Transistor) in series to charge the battery Current and discharge current control, so as to protect the battery once, but the MOS tube itself has a certain on-resistance ...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0029H02J7/00302H02J7/00306
Inventor 张志贤苏哲锋王大瑞刘宝忠罗仑
Owner BMTPOW LTD
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