CN219287167U

CN219287167U - Charger identification battery temperature and overvoltage protection circuit

Info

Publication number: CN219287167U
Application number: CN202222413207.4U
Authority: CN
Inventors: 梁志锋; 朱玉龙; 吴伟; 吴翔龙; 陈志军; 叶国华; 曾国强
Original assignee: Guangdong Greenway Technology Co Ltd
Current assignee: Guangdong Greenway Technology Co Ltd
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2023-06-30
Anticipated expiration: 2032-09-13

Abstract

The utility model discloses a charger battery temperature identification and overvoltage protection circuit, which is used for being respectively electrically connected with a battery pack, a protection chip and a charger, and comprises the following components: the battery pack charging device comprises a driving unit, a charging conducting unit and a temperature sensing unit, wherein the control end of the driving unit is electrically connected with the protection chip, the output end of the driving unit is electrically connected with the charging conducting unit, the input end of the charging conducting unit is electrically connected with the total positive end of the battery pack, and the output end of the charging conducting unit is electrically connected with the temperature sensing unit and the charger respectively. The utility model relates to a battery temperature and overvoltage protection circuit for a charger, which can ensure that the battery has double temperature protection functions in the charging process and a special charger is identified, so that the charging safety of the battery is ensured.

Description

Charger identification battery temperature and overvoltage protection circuit

Technical Field

The utility model relates to the field of chargers, in particular to a charger battery temperature identification and overvoltage protection circuit.

Background

Currently, lithium batteries in the market have basic protection functions, such as overvoltage, undervoltage, overcurrent and charge-discharge high-low temperature protection. For example, if the battery is over-voltage during charging, the battery will close the charging loop; or the battery detects the internal temperature of the battery according to the internal temperature sensor of the battery when the battery is charged to judge the ambient temperature of the battery, when the temperature of the battery exceeds the designed highest temperature or is lower than the designed lowest temperature, the battery triggers temperature protection, the battery turns off a charging loop, the charger stops charging, and the safety of the battery is ensured; however, at present, the conventional battery charger is stopped by means of self protection of the battery, if a protection loop cannot work in the battery charging process, the charger cannot identify the battery at this time, and the battery charger cannot stop charging, so that potential safety hazards exist. Then designing a circuit that the charger cooperates with the battery to monitor the battery temperature and voltage during charging is very promising in the battery product market.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provides a battery temperature and overvoltage protection circuit for a charger, which can ensure that the battery has dual temperature protection functions in the charging process and a special charger is identified, so that the charging safety of the battery is ensured.

The aim of the utility model is realized by the following technical scheme:

a charger identifies battery temperature and overvoltage protection circuit for electrical connection with a battery pack, a protection chip and a charger, respectively, comprising: the battery pack charging device comprises a driving unit, a charging conducting unit and a temperature sensing unit, wherein the control end of the driving unit is electrically connected with the protection chip, the output end of the driving unit is electrically connected with the charging conducting unit, the input end of the charging conducting unit is electrically connected with the total positive end of the battery pack, and the output end of the charging conducting unit is electrically connected with the temperature sensing unit and the charger respectively.

Preferably, the driving unit includes a resistor R8, a resistor R9, and a MOS transistor Q4, one end of the resistor R8 is electrically connected to the output end of the protection chip, the other end of the resistor R8 is electrically connected to the resistor R9 and the G electrode of the MOS transistor Q4, and the D electrode of the MOS transistor Q4 is electrically connected to the charging conducting unit.

Preferably, the charging conducting unit includes a resistor R6, a resistor R7, a diode D3 and a MOS transistor Q3, a first end of the resistor R6 is electrically connected to a total positive end of the battery pack, a second end of the resistor R6 is electrically connected to the resistor R7 and a G pole of the MOS transistor Q3, another end of the resistor R7 is electrically connected to an anode of the diode D3, and a cathode of the diode D3 is electrically connected to the driving unit.

Preferably, the MOS transistor Q3 is a P-MOS transistor.

Preferably, the charging conducting unit further includes a resistor R10, one end of the resistor R10 is electrically connected with the D electrode of the MOS transistor Q3, the other end of the resistor R10 is used for outputting a voltage, and the S electrode of the MOS transistor Q3 is electrically connected with the total positive end of the battery pack.

Preferably, the temperature sensing unit includes a resistor R11 and a resistor RT1, one end of the resistor R11 is electrically connected to the resistor R10, and the other end of the resistor R11 is electrically connected to the resistor RT 1.

Preferably, the resistor RT1 is a temperature sensitive resistor.

Compared with the prior art, the utility model has the following advantages:

the utility model relates to a battery temperature and overvoltage protection circuit for a charger, which is characterized in that a driving unit, a charging conducting unit and a temperature sensing unit are arranged, so that the charging conducting unit can be driven by a protection chip to work, when the voltage of a charging port is detected to have no overvoltage phenomenon, the temperature of a battery pack can be collected by the temperature sensing unit, the battery pack is charged only when the temperature of the battery is in a working range, and when one of the battery packs is detected to be abnormal, the charger is controlled to stop charging the battery pack, so that the safety of the battery is ensured. Therefore, the circuit can ensure that the battery has double temperature protection functions in the charging process, and the special charger is identified, so that the charging safety of the battery is ensured.

Drawings

FIG. 1 is a functional block diagram of a battery temperature and overvoltage protection circuit for a charger according to an embodiment of the present utility model;

fig. 2 is a circuit diagram of a battery temperature and overvoltage protection circuit identified by the charger of the embodiment shown in fig. 1.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the utility model. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

The current battery and the charger are mutually matched for use and are all independently protected, and if one party fails, a safety accident can occur. Such as: the battery can monitor the internal temperature, and when the temperature is too high or too low, the battery can turn off the current loop; in the practical use process, when the internal temperature protection is invalid during battery charging, the conventional charger cannot identify the internal temperature of the battery during battery charging, and the safety risk is possibly caused when the battery temperature exceeds the design maximum temperature.

Referring to fig. 1-2, a battery temperature and overvoltage protection circuit for a charger, which is used for being electrically connected with a battery pack, a protection chip and the charger, respectively, comprises: the battery pack charging device comprises a driving unit, a charging conducting unit and a temperature sensing unit, wherein the control end of the driving unit is electrically connected with the protection chip, the output end of the driving unit is electrically connected with the charging conducting unit, the input end of the charging conducting unit is electrically connected with the total positive end of the battery pack, and the output end of the charging conducting unit is electrically connected with the temperature sensing unit and the charger respectively.

Therefore, through setting up the drive unit, switch on unit and temperature-sensing unit charge, can drive the work of switching on the unit by the protection chip, and when the voltage that detects the mouth of charging does not have the excessive pressure phenomenon, then can gather the temperature of group battery by temperature-sensing unit, if the battery temperature just charges to the group battery when working range to when detecting one of them and appearing unusual, then control charger stop charging for the group battery, guarantee the security of battery. Therefore, the circuit can ensure that the battery has double temperature protection functions in the charging process, and the special charger is identified, so that the charging safety of the battery is ensured.

In this embodiment, the driving unit includes a resistor R8, a resistor R9, and a MOS transistor Q4, one end of the resistor R8 is electrically connected to the output end of the protection chip, the other end of the resistor R8 is electrically connected to the resistor R9 and the G electrode of the MOS transistor Q4, and the D electrode of the MOS transistor Q4 is electrically connected to the charging conducting unit.

In this embodiment, the charging conducting unit includes a resistor R6, a resistor R7, a diode D3, and a MOS transistor Q3, a first end of the resistor R6 is electrically connected to a total positive end of the battery pack, a second end of the resistor R6 is electrically connected to a G pole of the resistor R7 and a G pole of the MOS transistor Q3, another end of the resistor R7 is electrically connected to an anode of the diode D3, and a cathode of the diode D3 is electrically connected to the driving unit. Specifically, the MOS transistor Q3 is a P-MOS transistor.

In this embodiment, the charging conducting unit further includes a resistor R10, one end of the resistor R10 is electrically connected to the D electrode of the MOS transistor Q3, the other end of the resistor R10 is configured to output a voltage, and the S electrode of the MOS transistor Q3 is electrically connected to the total positive end of the battery pack.

In this embodiment, the temperature sensing unit includes a resistor R11 and a resistor RT1, one end of the resistor R11 is electrically connected to the resistor R10, and the other end of the resistor R11 is electrically connected to the resistor RT 1. Specifically, the resistor RT1 is a temperature sensitive resistor.

Working principle:

in the circuit, a B+ power supply is battery voltage, a CHG power supply is a driving pin of a protection chip, when the battery is normally charged, the CHG outputs a high level, the drain electrode and the source emitter of a MOS tube Q4 are conducted, so that the power supply B+ voltage passes through a resistor R6, a resistor R7 and a diode D3, the MOS tube Q4 forms a loop to GND, the voltage at two ends of the resistor R6 is the driving voltage of a PMOS tube Q3, and meanwhile, the PMOS tube Q3 conducts a charger to detect the B+ voltage at a COM port; a temperature-sensitive resistor for detecting temperature is connected to the battery on the NTC interface, so that the charger can collect temperature; after the charger detects that the voltage of the COM port is correct and the temperature of the collected battery is in the working range, the charger starts to charge the battery, and when the charger detects that the NTC temperature of the battery exceeds the design temperature or any protection of the battery occurs, the charger stops charging the battery, so that the battery is ensured to work in the design range.

The utility model can use the charging NTC detection function of the battery charger to perform secondary charging high-low temperature protection, and uses the battery charging signal as the charger identification signal, so that the battery is charged and protected, and the charger is also closed and output, thereby ensuring the charging safety of the battery.

The utility model can realize the protection function of adding the charging temperature of a heavy battery, has simple circuit structure, reduces the production cost on the premise of enhancing the battery protection function, can also recognize the situation that other chargers are abused to charge, and effectively protects the charging safety of the battery.

The above embodiments represent only a few embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. A battery temperature and overvoltage protection circuit are discerned to charger for respectively with group battery, protection chip and charger electricity connection, its characterized in that includes: the battery pack charging device comprises a driving unit, a charging conducting unit and a temperature sensing unit, wherein the control end of the driving unit is electrically connected with the protection chip, the output end of the driving unit is electrically connected with the charging conducting unit, the input end of the charging conducting unit is electrically connected with the total positive end of the battery pack, and the output end of the charging conducting unit is electrically connected with the temperature sensing unit and the charger respectively.

2. The battery temperature and overvoltage protection circuit according to claim 1, wherein the driving unit comprises a resistor R8, a resistor R9 and a MOS transistor Q4, one end of the resistor R8 is electrically connected with the output end of the protection chip, the other end of the resistor R8 is electrically connected with the resistor R9 and the G electrode of the MOS transistor Q4, and the D electrode of the MOS transistor Q4 is electrically connected with the charging conducting unit.

3. The battery temperature and overvoltage protection circuit according to claim 1, wherein the charging conducting unit comprises a resistor R6, a resistor R7, a diode D3 and a MOS transistor Q3, a first end of the resistor R6 is electrically connected with a total positive end of the battery pack, a second end of the resistor R6 is electrically connected with a G pole of the resistor R7 and a G pole of the MOS transistor Q3 respectively, the other end of the resistor R7 is electrically connected with an anode of the diode D3, and a cathode of the diode D3 is electrically connected with the driving unit.

4. The battery temperature and overvoltage protection circuit according to claim 3, wherein the MOS transistor Q3 is a P-MOS transistor.

5. The battery temperature and overvoltage protection circuit according to claim 3, wherein the charging conducting unit further comprises a resistor R10, one end of the resistor R10 is electrically connected with the D electrode of the MOS transistor Q3, the other end of the resistor R10 is used for outputting a voltage, and the S electrode of the MOS transistor Q3 is electrically connected with the total positive end of the battery pack.

6. The battery temperature and overvoltage protection circuit according to claim 5, wherein the temperature sensing unit comprises a resistor R11 and a resistor RT1, one end of the resistor R11 is electrically connected to the resistor R10, and the other end of the resistor R11 is electrically connected to the resistor RT 1.

7. The battery temperature and overvoltage protection circuit according to claim 6, wherein the resistor RT1 is a temperature sensitive resistor.