Six-string different-port lithium battery protection circuit

By using a six-cell lithium battery protection circuit with different ports, and by using the protection chip CW1074ALBS to collect cell voltage and temperature data and control the MOSFET, overcharge, over-discharge, and over-temperature protection of the lithium battery is achieved, solving the problem of low-cost protection and realizing efficient battery management.

CN224249351UActive Publication Date: 2026-05-15苏州彤帆智能科技有限公司
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Patent Information

Application Number
CN202521095584.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-05-30
Publication Date
2026-05-15
Estimated Expiration
2035-05-30

AI Technical Summary

Technical Problem

Existing technologies make it difficult to achieve overcharge, over-discharge, and over-temperature protection for lithium batteries at a low cost.

Method used

A six-cell lithium battery protection circuit is adopted, using the protection chip CW1074ALBS to collect cell voltage and temperature, and control the charging and discharging MOSFET and thermistor NTC1 to achieve overcharge, over-discharge and over-temperature protection.

Benefits of technology

It provides efficient overcharge, over-discharge, and over-temperature protection during charging and discharging, and has a simple structure and low cost.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a six-string different-port lithium battery protection circuit, which comprises a protection chip U1, a lithium battery is formed by connecting six battery cells in series, a positive electrode B + and a negative electrode B-of the lithium battery are respectively connected with a positive electrode charging end P + and a negative electrode charging end P-, and a charge-discharge MOS tube Q3 and a charge-discharge MOS tube Q2 are respectively connected between the negative electrode charging end P-and the negative electrode B-of the lithium battery; the protection chip U1 collects the voltage of each cell of the lithium battery, and is connected with and controls the on-off of the charging and discharging MOS tubes Q3 and Q2. And the protection chip U1 adopts a lithium ion battery or a lithium polymer battery protection chip CW1074ALBS. A CO port of the protection chip CW1074ALBS is connected with and controls the on-off of the charging MOS tube Q3 through a triode Q1; the emitter of the triode Q1 is connected with a CO port, the base of the triode Q1 is grounded through a resistor R17, and the collector of the triode Q1 is connected with the grid of the charging MOS tube Q3 through a diode D1; and the DO port of the protection chip CW1074ALBS is connected with the discharge MOS tube Q2. The over-charge protection circuit provides over-charge, over-discharge and charge-discharge over-temperature protection for the battery pack, and is simple in structure and low in cost.
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Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, and in particular to a protection circuit for a six-cell lithium battery. Background Technology

[0002] Lithium batteries have advantages such as high energy density, long service life, high rated voltage, high power handling capacity, low self-discharge rate, light weight, and strong adaptability to high and low temperatures. However, it is difficult to achieve a low-cost solution that prevents overcharging, over-discharging, and over-temperature protection at the same time. Utility Model Content

[0003] The purpose of this invention is to provide a six-cell lithium battery protection circuit to prevent overcharging, over-discharging, and over-temperature protection.

[0004] The technical solution of this utility model is:

[0005] A six-cell series lithium battery protection circuit includes a protection chip U1. The lithium battery consists of six cells connected in series. The positive and negative terminals B+ and B- of the lithium battery are connected to the positive and negative charging terminals P+ and P-, respectively. The negative charging terminal P- and the negative terminal B- of the lithium battery are also connected to charging and discharging MOSFETs Q3 and Q2, respectively. The protection chip U1 collects the voltage of each cell of the lithium battery and controls the on / off state of the charging and discharging MOSFETs Q3 and Q2.

[0006] Preferably, the protection chip U1 is a lithium-ion battery or lithium polymer battery protection chip CW1074ALBS.

[0007] Preferably, the CO port of the protection chip CW1074ALBS is connected to the control MOSFET Q3 via transistor Q1 to control its on / off state; the emitter of transistor Q1 is connected to the CO port, the base is grounded via resistor R17, and the collector is connected to the gate of the charging MOSFET Q3 via diode D1; the DO port of the protection chip CW1074ALBS is connected to the discharge MOSFET Q2.

[0008] Preferably, when the protection chip CW1074ALBS detects that the charging voltage of any cell in the lithium battery reaches 4.175V, it controls the CO port to output a low level to cut off the transistor Q1, and then controls the charging MOSFET Q3 to cut off through the diode D1, thereby stopping the charging.

[0009] Preferably, when the protection chip CW1074ALBS detects that the discharge voltage of any cell in the lithium battery reaches 2.7V, it controls the DO port to output a low level, thereby controlling the discharge MOSFET Q2 to be turned off and stopping the discharge.

[0010] Preferably, a fuse F1 is connected in series between the positive electrode B+ of the lithium battery and the positive and negative charging terminals P+.

[0011] Preferably, the protection chip CW1074ALBS is also connected to a thermistor NTC1 for collecting the lithium battery temperature and controlling the lithium battery to stop charging and discharging based on the lithium battery temperature.

[0012] The advantages of this utility model are:

[0013] This invention provides a highly integrated six-cell lithium battery protection circuit that provides overcharge, over-discharge, and over-temperature protection for the battery pack. It has a simple structure and low cost. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0015] Figure 1 This is a schematic diagram of the six-series non-contact lithium battery protection circuit of this utility model. Detailed Implementation

[0016] like Figure 1 As shown, the six-cell lithium battery protection circuit of this utility model includes a protection chip U1, which is a lithium-ion battery or lithium polymer battery protection chip CW1074ALBS. The lithium battery consists of six cells connected in series. The positive and negative terminals B+ and B- of the lithium battery are connected to the positive and negative charging terminals P+ and P-, respectively. A fuse F1 is connected in series between the positive terminal B+ and the positive and negative charging terminals P+. Charging and discharging MOSFETs Q3 and Q2 are connected between the negative charging terminal P- and the negative terminal B- of the lithium battery, respectively. The protection chip U1 collects the voltage of each cell of the lithium battery through resistors R2-R7 and controls the on / off state of the charging and discharging MOSFETs Q3 and Q2.

[0017] The CO port of the protection chip CW1074ALBS is connected to the charging MOSFET Q3 via transistor Q1; the emitter of transistor Q1 is connected to the CO port, the base is grounded through resistor R17, and the collector is connected to the gate of charging MOSFET Q3 via diode D1; the DO port of the protection chip CW1074ALBS is connected to the discharging MOSFET Q2.

[0018] When the protection chip CW1074ALBS detects that the charging voltage of any cell in the lithium battery reaches 4.175V, it controls the CO port to output a low level to cut off the transistor Q1, and then controls the charging MOSFET Q3 to cut off through the diode D1, thus stopping the charging process.

[0019] When the protection chip CW1074ALBS detects that the discharge voltage of any cell in the lithium battery reaches 2.7V, it controls the DO port to output a low level, thereby controlling the discharge MOSFET Q2 to be turned off and stopping the discharge.

[0020] The protection chip CW1074ALBS is also connected to a thermistor NTC1, which is used to collect the temperature of the lithium battery and control the lithium battery to stop charging and discharging based on the temperature.

[0021] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All modifications made in accordance with the spirit and essence of the main technical solution of this utility model should be included within the scope of protection of this utility model.

Claims

1. A six-series non-contact lithium battery protection circuit, characterized in that, The lithium battery, including the protection chip U1, consists of six cells connected in series. The positive and negative terminals B+ and B- of the lithium battery are connected to the positive and negative charging terminals P+ and P-, respectively. The negative charging terminal P- and the negative terminal B- of the lithium battery are also connected to the charging and discharging MOSFETs Q3 and Q2, respectively. The protection chip U1 collects the voltage of each cell of the lithium battery and controls the on and off of the charging and discharging MOSFETs Q3 and Q2.

2. The six-series heterogeneous lithium battery protection circuit according to claim 1, characterized in that, The protection chip U1 is a lithium-ion battery or lithium polymer battery protection chip CW1074ALBS.

3. The six-series heterogeneous lithium battery protection circuit according to claim 2, characterized in that, The CO port of the protection chip CW1074ALBS is connected to the charging MOSFET Q3 via transistor Q1; the emitter of transistor Q1 is connected to the CO port, the base is grounded through resistor R17, and the collector is connected to the gate of charging MOSFET Q3 via diode D1; the DO port of the protection chip CW1074ALBS is connected to the discharging MOSFET Q2.

4. The six-cell lithium battery protection circuit according to claim 3, characterized in that, When the protection chip CW1074ALBS detects that the charging voltage of any cell in the lithium battery reaches 4.175V, it controls the CO port to output a low level to cut off the transistor Q1, and then controls the charging MOSFET Q3 to cut off through the diode D1, thus stopping the charging process.

5. The six-cell lithium battery protection circuit according to claim 4, characterized in that, When the protection chip CW1074ALBS detects that the discharge voltage of any cell in the lithium battery reaches 2.7V, it controls the DO port to output a low level, thereby controlling the discharge MOSFET Q2 to be turned off and stopping the discharge.

6. The six-series heterogeneous lithium battery protection circuit according to claim 1, characterized in that, A fuse F1 is connected in series between the positive electrode B+ of the lithium battery and the positive and negative charging terminals P+.

7. The six-series heterogeneous lithium battery protection circuit according to claim 2, characterized in that, The protection chip CW1074ALBS is also connected to a thermistor NTC1, which is used to collect the temperature of the lithium battery and control the lithium battery to stop charging and discharging based on the temperature.