CN209673962U - Lithium disposable battery capacity monitoring circuit - Google Patents
Lithium disposable battery capacity monitoring circuit Download PDFInfo
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- CN209673962U CN209673962U CN201920216986.4U CN201920216986U CN209673962U CN 209673962 U CN209673962 U CN 209673962U CN 201920216986 U CN201920216986 U CN 201920216986U CN 209673962 U CN209673962 U CN 209673962U
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Abstract
The utility model discloses a kind of lithium disposable battery capacity monitoring circuits, it is calculated including lithium battery, filter capacitor, precision resistance, load circuit, A/D voltage conversion circuit, the internal resistance of cell and capacity judges firmware, the lithium battery, filter capacitor, precision resistance are connected in series to form major loop, and line-to-ground is equipped between the lithium battery and filter capacitor；The load circuit is in parallel with filter capacitor；The precision resistance positive and negative end is separately connected the positive and negative end of A/D voltage conversion circuit；The internal resistance of cell calculates and capacity judges that firmware and A/D voltage conversion circuit are connected in series；The filter capacitor is large capacity super capacitor, capacity >=1 farad；The resistance value of the precision resistance is 1/10th of lithium battery minimum internal resistance.The unnecessary switch for disconnecting load of the utility model, reduces observation circuit cost.
Description
[technical field]
The utility model belongs to electronic technology field, is related to a kind of lithium disposable battery capacity monitoring circuit.
[background technique]
With the development of Internet of Things industry and the construction of basic network, application of the sensor in Internet of Things network is got over
Come more extensive.Many internet of things sensors circuit inconvenience take electricity from power grid, but because of power consumption very little, can use large capacity one
Secondary property battery power supply, can maintain 8~10 years working times, such as water meter, hotlist etc..Sensor module needs timing to clothes
Business device end sends battery capacity information, and before battery exhausts, and sends alarm signal to server end, reminds network operation people
In time therefore replacement battery can accurately measure battery capacity to member, become the necessary functions of Internet of Things module.
With the consumption of battery capacity, the phenomenon that battery will appear internal resistance increase, and output voltage reduces, therefore current battery
Capacity monitoring can take the directly output voltage of measurement battery at work, and the side of battery capacity is judged by output voltage
Formula.But the voltage of this method measurement can change with output load current, therefore judge that the accuracy of battery capacity is not high,
It is only suitable for applying in the output relative constant module of electric current.Another improved method is that timing is disconnected by anode and load
It opens, is connected in a fixed fictitious load by switching switch, to obtain relatively-stationary electric current, measure output voltage to count
The internal resistance of cell is calculated, battery remaining power is then judged according to battery model.The shortcomings that this method is that load needs not stop to break
Electricity is restarted, while needing to increase switching switch and ON-OFF control circuit, this method both increase cost, is also increased additional
Energy consumption.
[utility model content]
The utility model provides a kind of lithium disposable battery capacity monitoring circuit, to solve technology present in background technique
Problem.
In order to solve the above technical problems, the utility model uses following technical scheme.
A kind of lithium disposable battery capacity monitoring circuit, including lithium battery, filter capacitor, precision resistance, load circuit, A/
D voltage conversion circuit, the internal resistance of cell calculate and capacity judges that firmware, the lithium battery, filter capacitor, precision resistance are connected in series
Major loop is formed, line-to-ground is equipped between the lithium battery and filter capacitor；The load circuit is in parallel with filter capacitor；Institute
State the positive and negative end that precision resistance positive and negative end is separately connected A/D voltage conversion circuit；The internal resistance of cell calculates and holds
Amount judges that firmware and A/D voltage conversion circuit are connected in series；The filter capacitor is large capacity super capacitor, capacity >=1 farad；
The resistance value of the precision resistance is 1/10th of lithium battery minimum internal resistance.
Further, the lithium battery is lithium disposable battery.
Further, the lithium disposable battery is lithium thionyl chloride cell.
Further, the lithium thionyl chloride cell includes ER14250 lithium thionyl chloride cell, ER18505 lithium-thionyl
One of acyl chlorides battery.
Further, the load in the load circuit includes one of water meter, hotlist or a variety of.
By the technical program, following effect may be implemented:
(1) the utility model uses new circuit structure, and minimum one is sealed between lithium battery and external filter capacitor
A precision resistance measures the electricity over the ground at both ends on series connection precision resistance by A/D voltage conversion circuit while loaded work piece
Pressure, can be obtained by calculation the output electric current of battery, and judge the internal resistance of cell by cell output voltage, by building in advance
Vertical battery capacity model, the residual capacity of available battery, and alarm can be issued when reaching the threshold capacity of setting, this
Not only precision is high for kind mode, but also does not increase cost and additional energy consumption；
(2) the unnecessary switch for disconnecting load of the utility model, reduces observation circuit cost.
[Detailed description of the invention]
Fig. 1 is the utility model lithium disposable battery capacity monitoring circuit diagram；
Fig. 2 is that loaded work piece electric current and battery discharge current change over time figure；
Fig. 3 is ER14250,10mA constant-current discharge voltage, capacity, internal resistance graph of relation.
[specific embodiment]
With reference to embodiment and compares attached drawing the utility model is described in further detail.It should be emphasized that
It is that following the description is only exemplary, rather than in order to limit the scope of the utility model and its application.
The characteristics of lithium thionyl chloride cell belongs to lithium disposable battery, this battery is that capacity is big, and discharge current is small, natural leak
Electrode is small, therefore is suitably for low-power consumption, the internet of things sensors circuit power supply to work long hours.Due to the electric discharge of this kind of lithium battery
Electric current is small, is not able to satisfy the current drain in load circuit full power operation generally, therefore can be one in parallel at battery both ends
The large capacity super capacitor for leaking electricity small, at 1 farad or more, therefore when loaded work piece, most of energy disappears capacitance
Consumption is all provided by capacitor, and after loading into standby mode, due to the consumption of capacitor electricity, capacitance voltage can be lower than battery electricity
Pressure, therefore battery can continue to capacitor charging, until capacitance voltage is equal to cell output voltage.Due to this characteristic of circuit,
It is usually very short to load full flow endurance, and the charging time then can be more much longer than the loaded work piece time.
This characteristic based on circuit, the utility model devise a kind of new lithium disposable battery capacity monitoring circuit,
The measurement of the internal resistance of cell can be influenced to avoid super capacitor, as shown in Figure 1, the lithium disposable battery capacity monitoring circuit, packet
Lithium battery, filter capacitor, current sample precision resistance, load circuit, A/D voltage conversion circuit, the internal resistance of cell is included to calculate and hold
Amount judges that firmware, the lithium battery, filter capacitor, precision resistance are connected in series to form major loop, the lithium battery and filtered electrical
Line-to-ground is equipped between appearance；The load circuit is in parallel with filter capacitor；The precision resistance positive and negative end is separately connected
The positive and negative end of A/D voltage conversion circuit；The internal resistance of cell calculates and capacity judges firmware and A/D voltage conversion circuit string
Connection connection.
The lithium battery is lithium disposable battery, and the lithium disposable battery is lithium thionyl chloride cell, and the lithium is sub-
Chlorosulfuric acid battery includes one of ER14250 lithium thionyl chloride cell, ER18505 lithium thionyl chloride cell.
The filter capacitor is large capacity super capacitor, capacity >=1 farad.
The precision resistance is current sample precision resistance, and resistance value is 1/10th of lithium battery minimum internal resistance.
The precision resistance can be embedded in lithium battery.
Load in the load circuit includes one of water meter, hotlist or a variety of.
The A/D voltage conversion circuit is made of voltage analog to digital conversion circuit, can be embedded in lithium battery.
The internal resistance of cell calculates and capacity judge firmware by singlechip group at can connect using single chip circuit in realization
After A/D voltage conversion circuit, the voltage value on current sample precision resistance is read, according to the different voltages value measured twice
(corresponding current samples the current value samplings different twice on precision resistance), to calculate the internal resistance of cell.
The lithium disposable battery capacity monitoring circuit of the utility model includes one for judging internal resistance and battery discharge mould
The computing unit of type match point.The computing unit is similarly single chip circuit, calculates with the internal resistance of cell above and capacity is sentenced
Disconnected firmware uses the same single-chip microcontroller, is the equal of the different firmware programs operated in single-chip microcontroller.
Depending on the resistance value selection gist battery maximum discharge current and voltage measurement accuracy of precision resistance, precision resistance resistance
The selection of value cannot be excessive, in order to avoid excessive energy is additionally consumed, it can not be too small, otherwise voltage measurement accuracy is inadequate, causes
The voltage difference that resistance both ends cannot be distinguished, influences electric current computational accuracy.The trueness error of precision resistance will have a direct impact on electric current
Measurement accuracy, and then influence the judgement of the measurement accuracy and battery capacity of the internal resistance of cell.Precision resistance be connected on anode and
Between super capacitor anode, through overtesting Long-term selection, the resistance value of final choice precision resistance is the ten of the internal resistance of lithium battery minimum
/ mono-, for example be between 10~300 ohm for the normal internal resistance of ER18505 lithium disposable battery, then current sample is accurate
The resistance value of resistance takes 1 ohm.
It is illustrated below by more specific embodiment.
Embodiment 1
As shown in Figure 1, a kind of lithium disposable battery capacity monitoring circuit, including lithium battery, filter capacitor, current sample essence
Cipher telegram resistance, load circuit, A/D voltage conversion circuit, the internal resistance of cell calculates and capacity judges firmware, the lithium battery, filtered electrical
Appearance, precision resistance are connected in series to form major loop, and line-to-ground is equipped between the lithium battery and filter capacitor；The load electricity
Road is in parallel with filter capacitor；The precision resistance positive and negative end is separately connected the positive and negative end of A/D voltage conversion circuit；Institute
It states internal resistance of cell calculating and capacity judges that firmware and A/D voltage conversion circuit are connected in series.
The lithium battery is lithium disposable battery, and the lithium disposable battery is lithium thionyl chloride cell, and the lithium is sub-
Chlorosulfuric acid battery is ER14250 lithium thionyl chloride cell.
The filter capacitor is large capacity super capacitor, and capacity is 1.2 farads.
The precision resistance is current sample precision resistance, and resistance value is 1/10th of lithium battery minimum internal resistance.
Load in the load circuit is hotlist.
Embodiment 2
A kind of lithium disposable battery capacity monitoring circuit, including it is lithium battery, filter capacitor, current sample precision resistance, negative
It carries circuit, A/D voltage conversion circuit, internal resistance of cell calculating and capacity and judges firmware, the lithium battery, filter capacitor, accurate electricity
Resistance is connected in series to form major loop, and line-to-ground is equipped between the lithium battery and filter capacitor；The load circuit and filtering
Capacitor is in parallel；The precision resistance positive and negative end is separately connected the positive and negative end of A/D voltage conversion circuit；In the battery
Resistance calculates and capacity judges that firmware and A/D voltage conversion circuit are connected in series.
The lithium battery is lithium disposable battery, and the lithium disposable battery is lithium thionyl chloride cell, and the lithium is sub-
Chlorosulfuric acid battery is ER18505 lithium thionyl chloride cell.
The filter capacitor is large capacity super capacitor, and capacity is 1 farad.
The precision resistance is current sample precision resistance, and resistance value is 1/10th of lithium battery minimum internal resistance.
The precision resistance can be embedded in lithium battery.
Load in the load circuit is water meter.
The A/D voltage conversion circuit can be embedded in lithium battery.
The technical principle of the utility model:
In the application of general Internet of Things, the load most of the time, cell output current was extremely low in a dormant state, and
When load works normally, cell output current is increased, even up to battery maximum discharge current.The internal resistance of cell is calculated, is needed
Battery-end output voltage is measured under different operating electric current twice, therefore both working conditions loaded just meet this survey
Amount condition, loaded work piece electric current and battery discharge current change over time as shown in Figure 2.
When measuring the internal resistance of cell, need to measure cell output voltage and electric current twice.For the first time, load is with relatively high power work
Make or full power operation starts, in hereafter a period of time, battery charges to capacitor with larger charging current, at this moment starts A/D
Voltage conversion circuit, as shown in Figure 1, can measure precision resistance both end voltage is respectively V using A/D voltage conversion circuit1With
V′1, then according to formula (1) available battery to capacitance charging current are as follows:
I1=(V1-V1')/R (1)
When second of measurement, complete machine is selected to be in standby, capacitor has been in full state, the electricity of battery output at this time
Stream is very small, and can measure resistance both end voltage at this time is V2With V '2, according to the electric current on formula (2) available precision resistance
Are as follows:
I2=(V2-V′2)/R (2)
According to current value and voltage value that formula (1) and formula (2) measure twice, can be calculated according to formula (3)
To the internal resistance of cell are as follows:
R=(V2-V1)/(I1-I2) (3)
According to apparatus for battery capacity measurement experience curve, it is known that new lithium disposable battery internal resistance is usually at several ohm to ten
Several ohm, when battery consumption will exhaust, the internal resistance of cell be will increase to more than 100 ohm, even more greatly.
By laboratory measurement establish accurate constant-current discharge voltage, capacity, internal resistance relation curve, see Fig. 3, measuring
After obtaining ER14250 lithium thionyl chloride cell internal resistance, ER14250 lithium thionyl chloride cell residual capacity can be accurately estimated, and
Alarm can be issued when reaching the threshold capacity of setting, sends alarm signal to server end in time, remind network maintenance staff
Replacement battery in time.Not only precision is high for this mode, but also does not increase cost and additional energy consumption, improves economic effect
Benefit.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (5)
1. a kind of lithium disposable battery capacity monitoring circuit, it is characterised in that: including lithium battery, filter capacitor, precision resistance, bear
It carries circuit, A/D voltage conversion circuit, internal resistance of cell calculating and capacity and judges firmware, the lithium battery, filter capacitor, accurate electricity
Resistance is connected in series to form major loop, and line-to-ground is equipped between the lithium battery and filter capacitor；The load circuit and filtering
Capacitor is in parallel；The precision resistance positive and negative end is separately connected the positive and negative end of A/D voltage conversion circuit；In the battery
Resistance calculates and capacity judges that firmware and A/D voltage conversion circuit are connected in series；The filter capacitor is large capacity super capacitor, is held
>=1 farad of amount；The resistance value of the precision resistance is 1/10th of lithium battery minimum internal resistance.
2. lithium disposable battery capacity monitoring circuit according to claim 1, it is characterised in that: the lithium battery is lithium one
Secondary property battery.
3. lithium disposable battery capacity monitoring circuit according to claim 2, it is characterised in that: the lithium disposable battery
For lithium thionyl chloride cell.
4. lithium disposable battery capacity monitoring circuit according to claim 3, it is characterised in that: the lithium-thionyl chloride
Battery includes one of ER14250 lithium thionyl chloride cell, ER18505 lithium thionyl chloride cell.
5. lithium disposable battery capacity monitoring circuit according to claim 1, it is characterised in that: in the load circuit
Load includes one of water meter, hotlist or a variety of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920216986.4U CN209673962U (en) | 2019-02-20 | 2019-02-20 | Lithium disposable battery capacity monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920216986.4U CN209673962U (en) | 2019-02-20 | 2019-02-20 | Lithium disposable battery capacity monitoring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209673962U true CN209673962U (en) | 2019-11-22 |
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ID=68569246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920216986.4U Active CN209673962U (en) | 2019-02-20 | 2019-02-20 | Lithium disposable battery capacity monitoring circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209673962U (en) |
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2019
- 2019-02-20 CN CN201920216986.4U patent/CN209673962U/en active Active
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