CN214626430U

CN214626430U - Circuit capable of keeping battery activity and detecting battery voltage

Info

Publication number: CN214626430U
Application number: CN202120608258.5U
Authority: CN
Inventors: 赵涛; 陆巧玲
Original assignee: Zhejiang Viewshine Intelligent Meter Co Ltd
Current assignee: Zhejiang Viewshine Intelligent Meter Co Ltd
Priority date: 2021-03-25
Filing date: 2021-03-25
Publication date: 2021-11-05
Anticipated expiration: 2031-03-25

Abstract

The utility model discloses a circuit capable of keeping battery activity and detecting battery voltage, which comprises a switch discharge unit and a voltage detection unit coupled between a battery discharge electrode and a power ground, and a micro control unit coupled with the switch discharge unit and the voltage detection unit; the micro control unit is used for periodically sending a switch level signal to the switch discharging unit, the switch discharging unit periodically opens a channel between a battery discharging electrode and a power ground based on the switch level signal, and the voltage detection unit is used for collecting a voltage signal and sending the voltage signal to the micro control unit when the channel is switched on. The utility model discloses a can keep the active circuit that detects battery voltage of battery, can give the periodic heavy current of battery and discharge, the automatic activation battery activity, furthest promotes the battery rate of utilization, does not influence the service life of battery again basically, can also detect battery voltage simultaneously, control battery user state.

Description

Circuit capable of keeping battery activity and detecting battery voltage

Technical Field

The utility model belongs to the technical field of instrument intelligent control, a can keep battery activity and detect battery voltage's circuit is related to.

Background

With the development of semiconductor technology and the popularization of digital control in recent years, the rapid development of the instrument industry is promoted. The instruments are various in types, and a large amount of manpower and material resources are needed to copy instrument data, so networking and wireless remote transmission become a new trend. The gas meter has the characteristics that the difference of installation environments is large, the safety requires gas-electricity separation, and the real-time monitoring is not needed, so that the use of a battery as a power supply is the mainstream.

The mass-produced batteries in the market are mainly classified into three types. The first type is alkaline batteries, which are common in life and are characterized by low price, heavy weight, limited energy and non-rechargeable property, and equipment or toys using the batteries in life need to be replaced frequently. The second type is a lithium ion battery, such as a mobile phone battery, which is characterized by portability, excellent capacity compared to an alkaline battery, rechargeability, and slightly higher price. The characteristics lead the mobile digital equipment market to be dominated by the characteristics, but the mobile digital equipment cannot be kept still for a long time, and the mobile digital equipment does not have power after being kept still for one year. The third type is a lithium disposable battery, wherein the lithium thionyl chloride battery is a battery type with the first volume energy ratio and the first weight energy ratio in the current mass-produced battery series. The natural discharge of the lithium thionyl chloride battery is very small, and the lithium thionyl chloride battery can still be normally used even if the lithium thionyl chloride battery is placed for 10 years. In the chemical reaction inside the battery, chloride ions and lithium ions are combined to form a solid substance lithium chloride, a thin and compact passivation film is formed on the surface of the lithium metal after the lithium chloride is precipitated, the passivation film can prevent the reaction from proceeding, the reaction speed is slowed down, and the effect of isolating the lithium metal and thionyl hydrogen is gradually achieved. The surface passivation film ensures low self-discharge of the battery and prolongs the storage period, and simultaneously causes the battery voltage to drop sharply when the battery starts to discharge, and even can not bear the power load of an electric appliance when the battery is serious. The voltage hysteresis of lithium thionyl chloride batteries is like a double-sided sword caused by the long storage life of the batteries, and figure 1 shows the discharge characteristics of normal batteries and hysteresis batteries and the process of eliminating the hysteresis.

SUMMERY OF THE UTILITY MODEL

Based on the above background, the utility model provides a can keep the battery activity and detect battery voltage's circuit, be particularly useful for aforementioned lithium thionyl chloride battery.

The utility model provides a technical scheme that its technical problem adopted as follows:

a circuit capable of maintaining battery activity and detecting battery voltage comprises a switch discharge unit and a voltage detection unit coupled between a battery discharge electrode and a power ground, and a micro control unit coupled with the switch discharge unit and the voltage detection unit; the micro control unit is used for periodically sending a switch level signal to the switch discharging unit, the switch discharging unit periodically opens a channel between a battery discharging electrode and a power ground based on the switch level signal, and the voltage detection unit is used for collecting a voltage signal and sending the voltage signal to the micro control unit when the channel is switched on.

Further, the switch discharge unit is a triode cascade switch circuit.

Further, the triode cascade switch circuit comprises triodes Q1 and Q2, resistors R2-R4 and a diode D2; the base electrode of the triode Q1 is coupled with the switch level signal output pin of the micro control unit through a resistor R2, the collector electrode is coupled with the battery discharge electrode through a diode D2 and is coupled with the base electrode of the triode Q2 through a resistor R4, the emitter electrode is grounded, and the resistor R3 is coupled between the base electrode and the emitter electrode of the triode Q1; the emitter of the transistor Q2 is coupled to the battery discharge electrode, and the collector is coupled to the power ground through the voltage detection unit.

Further, the voltage detection unit comprises resistors R5 and R6 and a capacitor C7, wherein one end of the R5 is coupled to the collector of the transistor Q2, and the other end of the R5 is coupled to one end of the resistor R6 and serves as a voltage signal output end; the other end of the resistor R6 is coupled to the power ground, and the capacitor C7 is coupled in parallel to the resistor R6 as a filter capacitor.

Furthermore, the micro control unit at least comprises a single chip microcomputer, and the model of the single chip microcomputer is an R7F0C003MDFB chip.

Furthermore, the micro control unit further comprises a crystal oscillator circuit and a reset circuit which are coupled with the single chip microcomputer.

Furthermore, the circuit also comprises a power supply unit which is coupled with a battery discharge electrode and supplies power to the micro control unit, wherein the power supply unit comprises a voltage stabilizing diode D1, a voltage stabilizing chip U1 and filter capacitors C1 and C2, wherein the anode of the voltage stabilizing diode D1 is coupled with the battery discharge electrode, the cathode of the voltage stabilizing diode D1 is coupled with the Vin pin of the voltage stabilizing chip U1 and is grounded through the filter capacitor C1, the Vout pin of the voltage stabilizing chip U1 is grounded through the filter capacitor C2 and is used for providing power VCC for the micro control unit, and the CND pin of the voltage stabilizing chip U1 is grounded.

Further, the micro control unit sends a switch level signal with duration time T to the switch discharge unit by taking the time T as a period, wherein the value range of T is 1-10 seconds, and the range of T is 0.5-1 ms.

Further, the battery is a lithium thionyl chloride battery.

The utility model has the advantages as follows:

the utility model discloses a can keep battery activity and detect battery voltage's circuit, the circuit is simple, and is with low costs, can give the periodic heavy current of battery and discharge, and the automatic activation battery activity promotes the battery rate of utilization to furthest, does not influence the service life of battery again basically, can also detect battery voltage simultaneously, control battery user state. The lithium thionyl chloride battery power supply circuit is particularly suitable for circuits using lithium thionyl chloride batteries as power supply sources and has good practicability.

Drawings

Fig. 1 is a schematic diagram of the discharge characteristics of a normal battery and a hysteresis battery and the process of eliminating hysteresis.

Fig. 2 is a schematic diagram of the unit module composition of the circuit capable of maintaining the battery activity and detecting the battery voltage according to the present invention.

Fig. 3 is a schematic circuit diagram of an embodiment of the middle switch discharging unit and the voltage detecting unit of the present invention.

Fig. 4 is a schematic circuit diagram of an embodiment of the micro control unit of the present invention.

Fig. 5 is a schematic circuit diagram of an embodiment of the power supply unit of the present invention.

Detailed Description

For further understanding of the present invention, preferred embodiments of the present invention will be described below with reference to examples, but it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the claims of the present invention.

The instrument uses the battery to supply power, in order to prolong the service time of the battery, the general power consumption is very small, especially for the civil gas meter, the static power consumption is kept for most of the time, only a few microamperes, but the battery is needed to provide large current when the instrument works or data is transmitted. As described in the background section, in the chemical reaction inside the lithium thionyl chloride battery, chloride ions and lithium ions combine to form solid lithium chloride, and after lithium chloride precipitates, a thin and dense passivation film is formed on the surface of the lithium metal, which can prevent the reaction from proceeding, slow down the reaction speed, and gradually isolate the lithium metal from thionyl hydrogen. The surface film ensures low self-discharge of the battery and prolongs the storage period, and simultaneously causes the battery voltage to drop sharply when the battery discharges with large current, and even cannot bear the power load of the gas meter when the battery discharges with large current (refer to figure 1). To solve this problem, the battery cannot be allowed to form the film while maintaining the activity of the battery. In order to prevent the formation of this film in the battery, the battery is periodically discharged at a high current once, so that the battery does not form a passivation film.

Based on the above background, the utility model provides a can keep battery activity and detect battery voltage's circuit can give the periodic heavy current of battery and discharge, does not basically influence the service life of battery again, can also detect battery voltage simultaneously.

As shown in fig. 2, the circuit capable of maintaining battery activity and detecting battery voltage of the present invention includes a switch discharging unit and a voltage detecting unit coupled between a battery discharging electrode and a power ground, and a micro control unit coupled between the switch discharging unit and the voltage detecting unit; the micro control unit is used for periodically sending a switch level signal to the switch discharging unit, the switch discharging unit periodically opens a path between a battery discharging electrode and a power ground based on the switch level signal, and the voltage detection unit is used for collecting a voltage signal and sending the voltage signal to the micro control unit when the path is conducted.

As shown in fig. 3, in an illustrated embodiment, the switching discharge unit is a transistor cascade switching circuit including transistors Q1 and Q2, resistors R2-R4, and a diode D2; the base electrode of the triode Q1 is coupled with the switch level signal output pin of the micro control unit through a resistor R2, the collector electrode is coupled with the battery discharge electrode through a diode D2 and is coupled with the base electrode of the triode Q2 through a resistor R4, the emitter electrode is grounded, and the resistor R3 is coupled between the base electrode and the emitter electrode of the triode Q1; the emitter of the transistor Q2 is coupled to the battery discharge electrode, and the collector is coupled to the power ground through the voltage detection unit.

In the embodiment shown, the voltage detection unit includes resistors R5 and R6 and a capacitor C7, wherein one end of R5 is coupled to the collector of the transistor Q2, and the other end is coupled to one end of a resistor R6 and serves as a voltage signal output end; the other end of the resistor R6 is coupled to the power ground, and the capacitor C7 is coupled in parallel to the resistor R6 as a filter capacitor.

In the preferred embodiment, the resistor R5 has a resistance of 200 ohms and the resistor R6 has a resistance of 100 ohms.

As shown in fig. 4, in an illustrated embodiment, the micro control unit is a single chip microcomputer, and the single chip microcomputer is a R7F0C003MDFB chip. The periphery of the circuit is also provided with a crystal oscillator circuit and a reset circuit. Wherein, singlechip 20 th foot is used for exporting the switch level signal, and 77 feet are used for receiving the voltage that voltage detection unit gathered. The reset circuit comprises a resistor R1 and a capacitor C3 which are connected in series, one end of the resistor R1 is coupled with a power supply VCC, the other end of the resistor R1 is coupled with a pin of the singlechip 10 and one end of the capacitor C3, and the other end of the capacitor C3 is grounded. The crystal oscillator circuit comprises a crystal oscillator Y1 coupled between

pins

11 and 12 of the single chip microcomputer, and two ends of the crystal oscillator Y1 are grounded through capacitors C5 and C6 respectively. The circuits are typical circuits, and the principle is not described.

As shown in fig. 5, in an embodiment, the circuit of the present invention further includes a power supply unit coupled to the battery discharge electrode and supplying power to the micro control unit, which includes a zener diode D1, a zener chip U1, a filter capacitor C1, and a filter capacitor C2, wherein the positive electrode of the zener diode D1 is coupled to the battery discharge electrode, the negative electrode is coupled to the Vin pin of the zener chip U1 and grounded via the filter capacitor C1, and the Vout pin of the zener chip U1 is grounded via the filter capacitor C2 for providing the single chip power VCC, and the CND pin of the zener chip U1 is grounded.

The operation principle of the circuit for maintaining the battery activity and detecting the battery voltage according to the present invention is further described with reference to the accompanying drawings:

the singlechip U2 outputs high level through the 20 th pin, the resistor R2 generates current to enable the triode Q1 to be opened, the voltage of the resistor R4 is pulled down, the triode Q2 is opened, the battery discharging electrode VIN1 is grounded through the resistors R5 and R6, LVDIN1 collects the partial voltage of the resistors R5 and R6 and outputs the partial voltage to the pin 77 of the singlechip, and the singlechip obtains the battery voltage through calculation. Because the sampling time of the singlechip is extremely short and is not more than 1ms, even if the sum of the resistors R5 and R6 is only 300 ohms, the power consumption is not large, but the current of 3.6V/300 omega-0.012A can be generated instantly, and the power is discharged every 3 seconds, so that the using current of the lithium thionyl chloride battery is changed greatly all the time, a passivation film cannot be formed, and the activity of the battery is maintained.

The above description of the embodiments is only intended to help understand the method of the present invention and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. A circuit capable of maintaining battery activity and detecting battery voltage comprises a switch discharge unit and a voltage detection unit coupled between a battery discharge electrode and a power ground, and a micro control unit coupled with the switch discharge unit and the voltage detection unit; the micro control unit is used for periodically sending a switch level signal to the switch discharging unit, the switch discharging unit periodically opens a channel between a battery discharging electrode and a power ground based on the switch level signal, and the voltage detection unit is used for collecting a voltage signal and sending the voltage signal to the micro control unit when the channel is switched on.

2. The circuit for maintaining battery activity and detecting battery voltage as claimed in claim 1, wherein said switching discharging unit is a triode cascade switching circuit.

3. The circuit for maintaining battery activity and detecting battery voltage as claimed in claim 2, wherein the said triode cascade switch circuit comprises transistors Q1, Q2, resistors R2-R4 and diode D2; the base electrode of the triode Q1 is coupled with the switch level signal output pin of the micro control unit through a resistor R2, the collector electrode is coupled with the battery discharge electrode through a diode D2 and is coupled with the base electrode of the triode Q2 through a resistor R4, the emitter electrode is grounded, and the resistor R3 is coupled between the base electrode and the emitter electrode of the triode Q1; the emitter of the transistor Q2 is coupled to the battery discharge electrode, and the collector is coupled to the power ground through the voltage detection unit.

4. The circuit for maintaining battery activity and detecting battery voltage as claimed in claim 3, wherein the voltage detection unit comprises resistors R5 and R6 and a capacitor C7, wherein one end of R5 is coupled to the collector of the transistor Q2, and the other end is coupled to one end of a resistor R6 and serves as a voltage signal output terminal; the other end of the resistor R6 is coupled to the power ground, and the capacitor C7 is coupled in parallel to the resistor R6 as a filter capacitor.

5. The circuit for maintaining battery activity and detecting battery voltage as claimed in claim 1, wherein said micro control unit comprises at least one single chip microcomputer, said single chip microcomputer is R7F0C003MDFB chip.

6. The circuit for maintaining battery activity and detecting battery voltage as claimed in claim 5, wherein said micro control unit further comprises a crystal oscillator circuit and a reset circuit coupled to said single chip.

7. The circuit for maintaining battery activity and detecting battery voltage according to claim 1, further comprising a power supply unit coupled to a battery discharge electrode and supplying power to the mcu, wherein the power supply unit comprises a zener diode D1, a zener chip U1, and filter capacitors C1 and C2, wherein the anode of the zener diode D1 is coupled to the battery discharge electrode, the cathode of the zener diode D1 is coupled to the Vin pin of the zener chip U1 and grounded via the filter capacitor C1, the Vout pin of the zener chip U1 is grounded via the filter capacitor C2 for providing the mcu power VCC, and the CND pin of the zener chip U1 is grounded.

8. The circuit capable of maintaining battery activity and detecting battery voltage according to any one of claims 1-7, wherein the micro control unit sends a switch level signal with duration T to the switch discharge unit in a period of time T, wherein T is from 1 second to 10 seconds, and T is from 0.5 ms to 1 ms.

9. The circuit for maintaining battery activity and detecting battery voltage as claimed in claim 8, wherein said battery is a lithium thionyl chloride battery.