CN210954271U - Lithium ion battery electric quantity display circuit - Google Patents
Lithium ion battery electric quantity display circuit Download PDFInfo
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- CN210954271U CN210954271U CN201921424080.8U CN201921424080U CN210954271U CN 210954271 U CN210954271 U CN 210954271U CN 201921424080 U CN201921424080 U CN 201921424080U CN 210954271 U CN210954271 U CN 210954271U
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Abstract
The utility model discloses a lithium ion battery power display circuit, fuel gauge unit, single chip unit operational amplifier OP1 and voltmeter M1, the fuel gauge unit, including the fuel gauge chip, is used for carrying out the power measurement to the battery cell; the singlechip unit comprises a singlechip chip and is used for communicating with the fuel gauge unit to acquire the electric quantity information of the battery pack and converting the residual electric quantity value into the duty ratio of a PWM signal and outputting the duty ratio to a resistor R4; the operational amplifier OP1 is used for following and outputting the input voltage of R4, so that the following voltage value has lower output impedance; voltmeter M1 is used for instructing group battery residual capacity, the utility model discloses can make electric bicycle's electric quantity obtain more accurate demonstration, make the user can accurately hold electric bicycle's remaining mileage of traveling, make things convenient for user's use.
Description
Technical Field
The utility model relates to a lithium cell technical field, concretely relates to lithium ion battery power display circuit.
Background
Electric bicycles have been increasingly popularized, most of the electric bicycles on the market in the past are powered by lead-acid batteries, and the electric bicycles are usually provided with an electric quantity indicating instrument panel for indicating the residual electric quantity of a battery pack so as to obtain the residual travel mileage information of a vehicle. When the lead-acid battery is discharged, the voltage of the lead-acid battery and the residual capacity show a linear relationship in a larger voltage range, so the lead-acid battery can generally adopt the voltage as the calculation and display of the residual capacity. With the rapid development of the lithium ion battery industry and the reduction of the cost, the national policy provides the miniaturization and lightweight requirements for the electric bicycle, the lithium ion battery is more and more applied to the electric bicycle and the electric moped at present, and when the lithium ion battery is adopted to supply power to the electric bicycle in the market, the electric quantity indication still adopts the mode of comparing and judging the battery voltage to display the electric quantity.
When current electric bicycle and electric bicycle battery pack adopt lithium ion battery power supply, because lithium ion battery is at the discharge in-process, the interlude of voltage is more flat, and especially the intermediate voltage platform of lithium iron phosphate battery is very flat, when adopting battery voltage to come as electric bicycle's electric quantity calculation basis and show, very big electric quantity metering error can appear for electric bicycle's electric quantity instruction is very inaccurate.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a lithium ion battery power display circuit can make electric bicycle's electric quantity obtain more accurate demonstration, makes the user can accurately hold electric bicycle's the surplus mileage of traveling, has made things convenient for user's use.
The utility model discloses a following technical scheme realizes: a lithium ion battery electric quantity display circuit, a fuel gauge unit, a singlechip unit operational amplifier OP1 and a voltmeter M1,
the fuel gauge unit comprises a fuel gauge chip and is used for metering the electric quantity of the battery unit;
the singlechip unit comprises a singlechip chip and is used for communicating with the fuel gauge unit to acquire the electric quantity information of the battery pack and converting the residual electric quantity value into the duty ratio of a PWM signal and outputting the duty ratio to a resistor R4;
the operational amplifier OP1 is used for following and outputting the input voltage of R4, so that the following voltage value has lower output impedance;
the voltmeter M1 is used for indicating the remaining battery power.
Furthermore, the communication mode of the single chip microcomputer unit and the electricity meter unit is IIC, and pull-up resistors R1 and R2 are arranged.
Further, a BAT pin of the electricity meter unit is connected with a positive electrode of the battery unit, a GND pin and an SRN pin of the electricity meter unit are connected with a negative electrode of the battery unit.
Further, the SRN pin and the SRP pin of the electricity meter unit are connected in series through a resistor R3.
Furthermore, an SRP pin of the electricity meter unit and a VSS pin of the single chip microcomputer unit are grounded.
Further, a PWM output pin of the single chip microcomputer unit is connected to a positive input terminal of the operational amplifier OP1 through a resistor R4.
Further, the positive input terminal of the operational amplifier OP1 is connected to the ground level through a capacitor C1.
Further, the pull-up resistors R1, R2 may be omitted.
Furthermore, the operational amplifier OP1 is omitted, and the resistor R4 is directly connected with a voltmeter for displaying electric quantity.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model has the advantages of simple structure, convenient use, low cost and convenient maintenance;
2. the utility model discloses set up the battery power display circuit of the invention, can with the actual residual capacity value of group battery with audio-visual carry out the accurate demonstration on the voltmeter head, the percentage state that the voltmeter head shows is unanimous with group battery residual capacity, makes the assurance group battery power state that the user can be accurate, promotes user's product and uses experience.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides an embodiment: a lithium ion battery electric quantity display circuit, a fuel gauge unit, a singlechip unit operational amplifier OP1 and a voltmeter M1,
the fuel gauge unit comprises a fuel gauge chip and is used for metering the electric quantity of the battery unit;
the singlechip unit comprises a singlechip chip and is used for communicating with the fuel gauge unit to acquire the electric quantity information of the battery pack and converting the residual electric quantity value into the duty ratio of a PWM signal and outputting the duty ratio to a resistor R4;
the operational amplifier OP1 is used for following and outputting the input voltage of R4, so that the following voltage value has lower output impedance;
the voltmeter M1 is used for indicating the remaining battery power.
The communication mode of the single chip microcomputer unit and the electricity meter unit is IIC, and pull-up resistors R1 and R2 are arranged.
The BAT pin of the fuel gauge unit is connected with the positive electrode of the battery unit, the GND pin and the SRN pin of the fuel gauge unit are connected with the negative end of the battery unit.
The SRN pin and the SRP pin of the electricity meter unit are connected in series through a resistor R3.
And the SRP pin of the electricity meter unit and the VSS pin of the singlechip unit are grounded.
And a PWM output pin of the singlechip microcomputer unit is connected with a positive input end of an operational amplifier OP1 through a resistor R4.
The positive input terminal of the operational amplifier OP1 is connected to ground level through a capacitor C1.
The pull-up resistors R1, R2 may be omitted.
The operational amplifier OP1 is omitted, and the resistor R4 is directly connected with a voltmeter for displaying the electric quantity.
The operation principle is that when the battery pack is charged or discharged, the current of a loop generates a voltage difference on a resistor R3, a fuel gauge unit acquires the current value of the battery pack by detecting the voltage at two ends of a resistor R3, coulomb calculation is carried out according to the current and time integration, the relative residual electric quantity value (SOC) of the battery pack is calculated, a single chip microcomputer unit communicates with the fuel gauge unit through an IIC communication interface, the relative residual electric quantity value (SOC) information of the battery pack is acquired, the residual electric quantity value (SOC) is converted into a corresponding PWM duty ratio, the PWM pulse with the duty ratio of 40% is output at a PWM output port, for example, if the residual electric quantity value (SOC) is 40%, the PWM pulse with the duty ratio of 40% is output, a resistor R4 and a capacitor C1 form an RC filter circuit, the PWM pulse is converted into a smoother corresponding voltage, for example, if the PWM with the power supply voltage of 5V and the 40% duty ratio is filtered by the RC, the voltage value is smoothed into a voltage of 2V × 40%, the voltage is output by an operational amplifier OP1, the smoothed voltage is displayed on the voltmeter, and if the full-scale of the electric quantity is displayed on the voltmeter, for example, the full-scale of the full-range of the full-display is regarded as 40%, the full-scale display.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (9)
1. A lithium ion battery electric quantity display circuit, a fuel gauge unit, a singlechip unit operational amplifier OP1 and a voltmeter M1, is characterized in that,
the fuel gauge unit comprises a fuel gauge chip and is used for metering the electric quantity of the battery unit;
the singlechip unit comprises a singlechip chip and is used for communicating with the fuel gauge unit to acquire the electric quantity information of the battery pack and converting the residual electric quantity value into the duty ratio of a PWM signal and outputting the duty ratio to a resistor R4;
the operational amplifier OP1 is used for following and outputting the input voltage of R4, so that the following voltage value has lower output impedance;
the voltmeter M1 is used for indicating the remaining battery power.
2. The lithium ion battery capacity display circuit of claim 1, wherein: the communication mode of the single chip microcomputer unit and the electricity meter unit is IIC, and pull-up resistors R1 and R2 are arranged.
3. The lithium ion battery capacity display circuit of claim 1, wherein: the BAT pin of the fuel gauge unit is connected with the positive electrode of the battery unit, the GND pin and the SRN pin of the fuel gauge unit are connected with the negative end of the battery unit.
4. The lithium ion battery capacity display circuit of claim 1, wherein: the SRN pin and the SRP pin of the electricity meter unit are connected in series through a resistor R3.
5. The lithium ion battery capacity display circuit of claim 1, wherein: and the SRP pin of the electricity meter unit and the VSS pin of the singlechip unit are grounded.
6. The lithium ion battery capacity display circuit of claim 1, wherein: and a PWM output pin of the singlechip microcomputer unit is connected with a positive input end of an operational amplifier OP1 through a resistor R4.
7. The lithium ion battery capacity display circuit of claim 1, wherein: the positive input terminal of the operational amplifier OP1 is connected to ground level through a capacitor C1.
8. The lithium ion battery capacity display circuit of claim 2, wherein: the pull-up resistors R1, R2 may be omitted.
9. The lithium ion battery capacity display circuit of claim 2, wherein: the operational amplifier OP1 is omitted, and the resistor R4 is directly connected with a voltmeter for displaying the electric quantity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921424080.8U CN210954271U (en) | 2019-08-29 | 2019-08-29 | Lithium ion battery electric quantity display circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921424080.8U CN210954271U (en) | 2019-08-29 | 2019-08-29 | Lithium ion battery electric quantity display circuit |
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| CN210954271U true CN210954271U (en) | 2020-07-07 |
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| CN201921424080.8U Active CN210954271U (en) | 2019-08-29 | 2019-08-29 | Lithium ion battery electric quantity display circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113296008A (en) * | 2021-05-19 | 2021-08-24 | 任谦 | Voltage regulation circuit and method based on SOC residual electric quantity estimation method |
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2019
- 2019-08-29 CN CN201921424080.8U patent/CN210954271U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113296008A (en) * | 2021-05-19 | 2021-08-24 | 任谦 | Voltage regulation circuit and method based on SOC residual electric quantity estimation method |
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