Battery capacity test circuit, test system and electric energy meter

Abstract

The invention discloses a battery capacity testing circuit, a battery capacity testing system and an electric energy meter, and relates to the technical field of battery testing. Through an integrating circuit in the monitoring circuit, the electric quantity of the battery is monitored by adopting a calculation mode of integrating discharge current and time of the battery, and input voltage is converted into output voltage through the integrating circuit. In the use process of the battery, normal consumption is composed of battery self-discharge and external discharge, and compared with a conventional voltage correlation measurement method that the voltage corresponds to a mapping relation of different charge states, the current discharge capacity of the battery is obtained based on real-time voltage measurement, the measurement accuracy is improved, and the measurement time is shortened. And the test accuracy of the battery life is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing, and in particular to a battery capacity testing circuit, a testing system and an electric energy meter. Background Art

[0002] Currently used smart energy meters usually use disposable lithium thionyl chloride batteries as auxiliary power sources in the meter to ensure that the clock in the meter can still run accurately when the mains power is off. Currently, most of them use the voltage correlation sampling method of series resistance to detect the battery voltage to determine whether it is failed.

[0003] The electric meter is powered by the mains. At this time, the lithium thionyl chloride battery in the electric energy meter, as an auxiliary power source, will be in a small current condition for a long time. A dense passivation film will gradually form on the surface of the metallic lithium. This film is similar to internal resistance. Although it can prevent lithium from further reacting with thionyl chloride, it causes the battery voltage hysteresis phenomenon, which affects the battery voltage detection of the electric energy meter. The conventional voltage correlation measurement method maps the voltage to different charge states, which can only predict the approximate charge state, resulting in reduced prediction accuracy and further reduced accuracy of battery life testing.

[0004] Therefore, how to improve the monitoring accuracy of the remaining capacity of the battery is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a battery capacity test circuit, a test system and an electric energy meter to solve the problem of inaccurate voltage detection in battery voltage measurement.

[0006] In order to solve the above technical problems, the present invention provides a battery capacity test circuit, the test circuit includes a battery voltage acquisition circuit and a monitoring circuit; wherein the monitoring circuit includes an integration circuit;

[0007] The voltage output terminal of the battery voltage acquisition circuit is connected to the input terminal of the integration circuit; and is used to acquire the voltage value of the battery;

[0008] The output end of the integration circuit outputs the current discharge capacity of the battery;

[0009] The monitoring circuit is used to determine the current current value according to the voltage value and the resistance value in the battery voltage acquisition circuit; and determine the current discharge capacity of the battery according to the relationship between the current value and the time integral.

[0010] In one aspect, the integration circuit includes an integration amplifier, a first resistor, a second resistor, and a first capacitor;

[0011] The voltage output end of the battery voltage collection circuit is connected to the first end of the first resistor;

[0012] The second end of the first resistor is connected to the first end of the first capacitor and is connected to the inverting input end of the integrating amplifier;

[0013] The second end of the first capacitor is connected to the output end of the integrating amplifier; and the output end of the integrating amplifier serves as the output end of the integrating circuit;

[0014] The first end of the second resistor is connected to the non-inverting input end of the integrating amplifier; the second end of the second resistor is grounded.

[0015] On the other hand, it also includes a display circuit; the display circuit includes a first comparator and a display screen;

[0016] The first input terminal of the first comparator is connected to the output terminal of the integrating amplifier; the power value of the second input terminal of the first comparator is the initial power value of the battery;

[0017] The output end of the first comparator is connected to the display screen; and is used to determine the current remaining capacity according to the relationship between the current discharge capacity and the initial power of the battery.

[0018] On the other hand, it also includes a reminder circuit; the reminder circuit includes a second comparator and a light emitting diode;

[0019] The first input terminal of the second comparator is connected to the output terminal of the integrating amplifier; the electric quantity value of the second input terminal of the second comparator is the reference electric quantity;

[0020] The output end of the second comparator is connected to the anode of the light emitting diode; the cathode of the light emitting diode is grounded; and it is used to trigger the light emitting diode to work according to the relationship between the reference power and the current remaining capacity.

[0021] On the other hand, it also includes a buzzer;

[0022] The buzzer is connected to the output end of the second comparator.

[0023] On the other hand, a third resistor is also included;

[0024] The first end of the third resistor is connected to the output end of the integrating amplifier; the second end of the third resistor is connected to the anode of the light emitting diode.

[0025] On the other hand, the battery voltage acquisition circuit includes a fourth resistor and a fifth resistor;

[0026] The positive electrode of the battery is connected to the first end of the fifth resistor; the second end of the fifth resistor is connected to the first end of the fourth resistor, and the common end of the fifth resistor and the fourth resistor serves as the voltage output end of the battery voltage acquisition circuit and is connected to the input end of the integration circuit;

[0027] A second end of the fourth resistor is grounded and connected to the negative electrode of the battery.

[0028] On the other hand, the resistance of the fourth resistor is determined by the critical current value of the fifth resistor.

[0029] In order to solve the above technical problem, the present invention also provides a battery capacity testing system, including the battery capacity testing circuit described above.

[0030] In order to solve the above technical problem, the present invention further provides an electric energy meter, comprising the above-mentioned battery capacity test circuit.

[0031] The present invention provides a battery capacity test circuit, the test circuit includes a battery voltage acquisition circuit and a monitoring circuit; wherein the monitoring circuit includes an integration circuit; the voltage output end of the battery voltage acquisition circuit is connected to the input end of the integration circuit; used to collect the voltage value of the battery; the output end of the integration circuit outputs the current discharge capacity of the battery; the monitoring circuit is used to determine the current current value according to the voltage value and the resistance value in the battery voltage acquisition circuit; and the current discharge capacity of the battery is determined according to the current value and the time integral relationship. The present invention uses the integration circuit in the monitoring circuit to realize the monitoring of the battery power by using the calculation method of the discharge current and time integral of the battery, and converts the input voltage into the output voltage through the integration circuit. During the use of the battery, the normal consumption consists of the battery self-discharge and external discharge. Compared with the conventional voltage correlation measurement method, which maps the voltage to different charge states, the present invention obtains the current discharge capacity of the battery based on real-time voltage measurement, improves the measurement accuracy, and also improves the test accuracy of the battery life.

[0032] In addition, the present invention also provides a battery capacity testing system and an electric energy meter, which have the same beneficial effects as the above-mentioned battery capacity testing circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] FIG1 is a structural diagram of a battery capacity test circuit provided by an embodiment of the present invention;

[0035] FIG2 is a structural diagram of a battery voltage acquisition circuit provided by an embodiment of the present invention;

[0036] FIG. 3 is a structural diagram of another battery capacity testing system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The core of the present invention is to provide a battery capacity test circuit, a test system and an electric energy meter to solve the problem of inaccurate voltage detection in battery voltage measurement.

[0039] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] In the prior art, the voltage correlation sampling method of the series resistor is that when the meter is working normally, the meter is powered by the mains, and the battery will only be in a small current state for a long time. The passivation film of the battery will gradually thicken, and the voltage hysteresis phenomenon will become more obvious. In severe cases, even if the remaining capacity of the battery is more than 95%, the minimum voltage will drop to 2V or even lower, which will directly affect the battery voltage detection of the meter and misjudge the battery usage.

[0041] The demand for residual capacity monitoring devices for lithium / thionyl chloride batteries reaches 100 million per year. Li / SOCl2 battery is an inorganic electrolyte battery. This battery uses pure metallic lithium as the negative electrode, liquid thionyl chloride (SOCl2) as the positive electrode active material, and also serves as a non-aqueous solvent for inorganic salts such as electrolyte LiCl04 or LiAlCl4, and uses a porous carbon electrode as the positive electrode current collector. This battery has the following characteristics:

[0042] 1. High specific energy, the theoretical specific energy is as high as 1470kwh / kg, and the actual specific energy reaches 660kwh / kg;

[0043] 2. High operating voltage, open circuit voltage is 3.6V~3.7V, and the average operating voltage is above 3V;

[0044] 3. The working platform is stable. When discharging at a medium current density (such as 1mA / cm2), the battery operating voltage is 3.3V and remains unchanged before 90% of the battery capacity is discharged;

[0045] 4. Wide applicable temperature range, -55C~+85"C;

[0046] 5. Long working life, up to more than ten years.

[0047] Carbon-coated batteries have low costs and high safety and reliability. These characteristics make this system widely used in fields such as intelligent instruments and meters. However, this system also has certain disadvantages. When carbon-coated Li / SOCl2 batteries are discharged with large currents, the discharge platform will be low, that is, the discharge capacity is far lower than the rated capacity due to low power, and voltage lag is often present during use. In order to ensure that the meter can maintain clock, storage and other functions when the power is off, the technology to predict the remaining capacity of the Li / SOCl2 battery of the energy meter is indispensable.

[0048] Voltage correlation is a very basic method for battery charge monitoring. The algorithm uses the OCV (open circuit voltage) of the battery and associates this value with a voltage lookup table, where each voltage corresponds to a different SOC (state of charge). Using the voltage correlation method, if the OCV of the battery is 3.72 volts, the fuel gauge can predict that the SOC at a given time is 50%. Here, only the mapping relationship between the battery voltage and the state of charge is predicted. If the current battery voltage is 3.92V, the range between the corresponding mapping relationship is large, and the corresponding predicted state of charge is 50%, resulting in the same state of charge corresponding to the battery voltage of 3.72V, and the predicted life is actually reflected in the battery charge inaccurately. If the interval between the two is small, due to the detection of the real-time battery voltage, the battery charge obtained by the comparison of the mapping relationship has a hysteresis, resulting in the inability to obtain the actual battery charge in real time. The battery capacity test circuit provided by the present invention can solve the above technical problems.

[0049] FIG. 1 is a structural diagram of a battery capacity test circuit provided by an embodiment of the present invention. As shown in FIG. 1 , the test circuit includes a battery voltage acquisition circuit 1 and a monitoring circuit 2; wherein the monitoring circuit 2 includes an integration circuit 3;

[0050] The voltage output terminal of the battery voltage acquisition circuit 1 is connected to the input terminal of the integration circuit 3; it is used to acquire the voltage value of the battery;

[0051] The output end of the integration circuit 3 outputs the current discharge capacity of the battery;

[0052] The monitoring circuit 2 is used to determine the current value according to the voltage value and the resistance value in the battery voltage acquisition circuit 1; and determine the current discharge capacity of the battery according to the relationship between the current value and the time integral.

[0053] Specifically, the battery voltage acquisition circuit is used to acquire the voltage value of the battery. The components in the corresponding specific acquisition circuit are not limited and can be the same as the conventional correlation battery acquisition circuit, or other acquisition circuits can be used. The voltage output terminal of the battery voltage acquisition circuit is connected to the inverting input terminal of the integration circuit, and the output terminal of the integration circuit outputs the current discharge capacity of the battery.

[0054] The integration circuit is composed of an operational amplifier, a feedback capacitor, an input resistor and a feedback resistor. The input voltage should be set according to the input voltage range of the operational amplifier and the linearity requirements of the circuit. The input voltage should not exceed the maximum input voltage of the operational amplifier.

[0055] The integration circuit here mainly determines the current value through the obtained voltage value and the resistance value in the battery voltage acquisition circuit, and determines the discharge capacity at this time based on the relationship between the current value and the time integral. The current value and the time integral obtain the charge amount, that is, the discharge capacity, so as to facilitate the output of the integration circuit.

[0056] In an integrating circuit, the integral of current over time is used to determine the charge. The charge (Q) can be calculated by integrating the current (I) over time (t), and the basic formula is: Q = ∫I(t)dt;

[0057] The integral here is the definite integral of time, which represents the cumulative product of current and time in a specific time interval. If the current is constant, the formula is simplified to: Q = I × t; in: Q is the charge (unit: coulomb, C); I is the current (unit: ampere, A); t is time (unit: seconds, s).

[0058] In a real circuit, if the current changes with time, it is necessary to integrate the current function over the entire time interval. For example, if the current is a linear function of time: I(t)=a+bt; Where a and b are constants, the charge Q can be calculated by integration: Q=∫(a+bt)dt=a∫dt+b∫tdt; Q=a(t+C)+ b / 2*t 2 +C′; Where C and C′ are integration constants. For integration over a specific time interval, the upper and lower limits of the integration need to be specified.

[0059] In practical applications of integration circuits, the amount of charge can be determined by measuring current and time. For example, using an integrator circuit (such as an integrator built using an operational amplifier), the change in charge across a resistor can be measured to obtain a voltage output that is proportional to the amount of charge. If the parameters of the circuit are known, the charge can be calculated by measuring the voltage. When designing an integration circuit, factors such as circuit stability, linearity, input current range, and integration time must also be considered to ensure accurate measurement of the charge.

[0060] A battery capacity test circuit provided by an embodiment of the present invention comprises a battery voltage acquisition circuit and a monitoring circuit; wherein the monitoring circuit comprises an integration circuit; the voltage output end of the battery voltage acquisition circuit is connected to the input end of the integration circuit; it is used to acquire the voltage value of the battery; the output end of the integration circuit outputs the current remaining capacity of the battery; the monitoring circuit is used to determine the current current value according to the voltage value and the resistance value in the battery voltage acquisition circuit; and the current discharge capacity of the battery is determined according to the relationship between the current value and the time integral. The present invention uses the integration circuit in the monitoring circuit to realize the monitoring of the battery power by using the calculation method of the discharge current and the time integral of the battery, and converts the input voltage into the output voltage through the integration circuit. During the use of the battery, the normal consumption consists of the self-discharge of the battery and the external discharge. Compared with the conventional voltage correlation measurement method, which maps the voltage to different charge states, the present invention obtains the current discharge capacity of the battery based on real-time voltage measurement, improves the accuracy of the measurement, and also improves the accuracy of the test of the battery life.

[0061] In some embodiments, as shown in FIG1 , the integration circuit 3 includes an integration amplifier U1 , a first resistor R1 , a second resistor R2 , and a first capacitor C1 ;

[0062] The voltage output end of the battery voltage collection circuit 1 is connected to the first end of the first resistor R1;

[0063] The second end of the first resistor R1 is connected to the first end of the first capacitor C1 and is connected to the inverting input end of the integrating amplifier U1;

[0064] The second end of the first capacitor C1 is connected to the output end of the integrating amplifier U1; and the output end of the integrating amplifier U1 serves as the output end of the integrating circuit 3;

[0065] A first end of the second resistor R2 is connected to the non-inverting input end of the integrating amplifier U1 ; a second end of the second resistor R2 is grounded.

[0066] It is understood that the values ​​of the capacitor (Cf) and feedback resistor (Rf) are selected based on the required integration time and the frequency response of the circuit. The integration time constant τ is determined by the product of the resistance and the capacitance, that is, τ=Rf*Cf. The output voltage range of the integration circuit is limited by the supply voltage of the operational amplifier. Make sure that the output voltage does not exceed the linear operating range of the operational amplifier. The integration circuit may be affected by noise and drift. The use of high-quality components and appropriate filtering techniques can improve the stability of the circuit. In actual circuit design, factors such as power supply stability, circuit layout, signal integrity, and protection measures also need to be considered. After the design is completed, the circuit needs to be tested and calibrated to ensure that it works as expected and make necessary adjustments. In some applications, it may be necessary to control the integration process through software or hardware, such as controlling the switching of the input voltage through a pulse width modulation (PWM) signal. When designing an integration circuit, electrical safety and protection measures also need to be considered to prevent circuit damage or safety risks.

[0067] The specific device of the integration circuit provided in this embodiment can convert the time change rate (i.e., derivative) of the input signal into the cumulative amount of the output signal on the basis of realizing the output of charge quantity, which helps to smooth noise and fluctuations and reduce the influence of high-frequency noise. The time constant (τ) of the integration circuit is determined by the resistance and capacitance in the circuit and can be precisely controlled to achieve precise adjustment of the signal integration time. It is used for signal synchronization to adjust the phase of the signal to be synchronized with the reference clock.

[0068] In some embodiments, as shown in FIG1 , a display circuit 4 is further included; the display circuit 4 includes a first comparator U2 and a display screen 5;

[0069] The first input terminal of the first comparator U2 is connected to the output terminal of the integrating amplifier U1; the power value of the second input terminal of the first comparator U2 is the initial power W0 of the battery;

[0070] The output end of the first comparator U2 is connected to the display screen 5 and is used to determine the current remaining capacity according to the relationship between the current discharge capacity W1 and the initial power W0 of the battery.

[0071] It is understandable that the display circuit is used to display the current remaining capacity of the battery, which needs to be obtained by subtracting the current battery discharge power from the initial power. The initial power here can be based on the power at the beginning of the battery power-on, such as 100% power. It can also be based on the power at the last moment minus the battery discharge power to get the current remaining capacity, where the power at the last moment is the remaining capacity at the last moment. This step-by-step reduction ensures the accuracy of the data.

[0072] The first comparator is mainly used as a subtractor, a circuit used to compare two voltage or current values, and it outputs a signal representing the relative magnitude of the two input signals. When the comparator works in the linear region, it can be used as an analog subtractor. If V + is the voltage applied to the positive input terminal, V − is the voltage applied to the negative input terminal, the comparator output voltage will be + −V − Proportional to the input voltage. Due to the hysteresis effect of the actual comparator, when used as a subtractor, the output may not return to zero exactly when the input voltages are equal, but will change state only when the difference between the two input voltages reaches a certain threshold. The output of the comparator is usually a digital signal (high or low), and when used as a subtractor, it may need to be properly processed or converted depending on the type of output. When using a comparator as a subtractor, it is necessary to pay attention to parameters such as the common mode range of the input signal, the power supply voltage of the comparator, the input bias current, and the offset voltage.

[0073] Regarding the display screen, multiple parameters such as the current remaining capacity, initial capacity, and current discharge capacity may be displayed, or only the current remaining capacity may be displayed. There is no limitation here, as long as the corresponding parameters can be displayed on the display screen.

[0074] The specific device of the display circuit provided in this embodiment is used as a subtractor through the first comparator, and the circuit design is simple, usually only two input terminals and an appropriate bias circuit are required. The two input terminals of the comparator can be easily adjusted by changing the input signal to achieve different subtraction operations. The comparator usually has a fast response time and is suitable for real-time systems that require fast subtraction operations. In the linear working area of ​​the comparator, the output voltage is linearly related to the difference between the two input signals, which is convenient for accurate subtraction operations.

[0075] In some embodiments, as shown in FIG. 1 , a reminder circuit 6 is further included; the reminder circuit 6 includes a second comparator U3 and a light emitting diode HL1;

[0076] The first input terminal of the second comparator U3 is connected to the output terminal of the integrating amplifier U1; the electric quantity value of the second input terminal of the second comparator U3 is the reference electric quantity Wref;

[0077] The output end of the second comparator U3 is connected to the anode of the light emitting diode HL1; the cathode of the light emitting diode HL1 is grounded; and it is used to trigger the light emitting diode HL1 to work according to the relationship between the reference power Wref and the current remaining capacity.

[0078] Specifically, the output of the second comparator depends only on the voltage difference between the two input terminals. If the voltage at the positive input terminal is higher than that at the negative input terminal, the output will tend to a positive saturation state; if the voltage at the negative input terminal is higher than that at the positive input terminal, the output will tend to a negative saturation state. In order to stabilize the output of the comparator when the input voltage changes, a hysteresis effect is usually introduced. This means that the input voltage must exceed a threshold to change the output state, and the output state will only change when the input voltage decreases below another threshold. The output of the comparator is usually in digital form, that is, a high level or a low level. The high level can be a positive saturation voltage, and the low level can be a negative saturation voltage or zero. In the present invention, if the current remaining capacity is less than the set reference power, the alarm device will be triggered, outputting a high level, triggering the light-emitting diode to work.

[0079] The combination of the second comparator and the light emitting diode provided in this embodiment can monitor the remaining power of the battery voltage in real time and add an alarm device to facilitate the user's detection.

[0080] In some embodiments, a buzzer is also included;

[0081] The buzzer is connected to the output terminal of the second comparator.

[0082] It is understandable that, on the basis of the original addition of the light-emitting diode, the buzzer can be used to remind the user auditorily, and when the second comparator outputs a high level, the buzzer is triggered to work, thereby improving the user experience.

[0083] In some embodiments, as shown in FIG1 , a third resistor R3 is further included;

[0084] A first end of the third resistor R3 is connected to the output end of the integrating amplifier U1 ; a second end of the third resistor R3 is connected to the anode of the light emitting diode HL1 .

[0085] It is understandable that since the light emitting diode (LED) is made of semiconductor materials, it has a fixed forward operating voltage. During normal operation, the current passing through the LED needs to be limited to prevent excessive current from damaging the LED. The third resistor can limit the current and protect the LED. The third resistor can provide a stable current source, and even if the power supply voltage fluctuates slightly, the third resistor can keep the current passing through the LED relatively stable. If the power supply voltage is higher than the forward operating voltage of the LED, the third resistor can divide the voltage to ensure that the voltage applied to both ends of the LED is within its operating range. By changing the value of the third resistor, the current passing through the LED can be adjusted, thereby controlling the brightness of the LED. Excessive current can cause the LED to overheat, affecting its life and performance. The third resistor can reduce the current passing through the LED, thereby reducing the thermal effect.

[0086] In some embodiments, FIG. 2 is a structural diagram of a battery voltage acquisition circuit provided by an embodiment of the present invention. As shown in FIG. 2 , the battery voltage acquisition circuit includes a fourth resistor R4 and a fifth resistor R5;

[0087] The positive electrode of the battery is connected to the first end of the fifth resistor R5; the second end of the fifth resistor R5 is connected to the first end of the fourth resistor R4, and the common end of the fifth resistor R5 and the fourth resistor R4 is used as the voltage output end of the battery voltage acquisition circuit 1, and is connected to the input end of the integration circuit;

[0088] A second end of the fourth resistor R4 is grounded and connected to the negative electrode of the battery.

[0089] It can be understood that the battery voltage acquisition circuit in this embodiment is the same as the conventional acquisition circuit, and is implemented by voltage sampling with a series of high-resistance resistors, where U2'=U1'*R4 / (R4+R5), R4 is used as a sampling resistor and is connected to the negative electrode of the battery. The control chip of the subsequent integration circuit can use the microcontroller unit (MCU) that comes with the electric energy meter, or it can be configured separately, including impedance matching, analog-to-digital converter (ADC) sampling, floating-point calculation, etc., to obtain the current discharge capacity and thus the remaining capacity.

[0090] In some embodiments, the resistance of the fourth resistor is determined by the critical current value of the fifth resistor.

[0091] Specifically, when selecting the sampling resistor, the maximum current of the load must be considered first, and the resistance should not be too large. When the actual meter is powered by a battery, the load is only microamperes, so the resistance can be selected according to the actual load needs. Secondly, due to voltage sampling, a high-precision, low-temperature drift resistor type needs to be selected.

[0092] In this embodiment, the selection of the fourth resistor needs to take into account the maximum critical current of the fifth resistor to ensure the accuracy of voltage acquisition.

[0093] Furthermore, the present invention also provides a battery capacity testing system, comprising the above-mentioned battery capacity testing circuit.

[0094] FIG3 is a structural diagram of another battery capacity testing system provided in an embodiment of the present invention. As shown in FIG3 , a battery voltage sampling circuit 1 is connected to an MCU 7. The battery voltage sampling circuit is used to collect the corresponding load voltage between the battery and the load. The MCU 7 converts the load voltage into a current number and obtains the remaining battery capacity through calculation, and displays the remaining power on a display screen 5. When the remaining capacity is lower than a reference value, an alarm module 8 is triggered to realize real-time battery capacity monitoring.

[0095] For an introduction to a battery capacity testing system provided by the present invention, please refer to the above method embodiment, which will not be described in detail herein. It has the same beneficial effects as the above battery capacity testing circuit.

[0096] Furthermore, the present invention also provides an electric energy meter, comprising the above-mentioned battery capacity test circuit.

[0097] For an introduction to an electric energy meter provided by the present invention, please refer to the above method embodiment, and the present invention will not be repeated here. It has the same beneficial effects as the above battery capacity test circuit.

[0098] The above is a detailed introduction to a battery capacity test circuit, a test system and an electric energy meter provided by the present invention. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the present invention.

[0099] It should also be noted that, in this specification, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A battery capacity test circuit, characterized in that: The test circuit includes a battery voltage acquisition circuit and a monitoring circuit; wherein the monitoring circuit includes an integration circuit; The voltage output terminal of the battery voltage acquisition circuit is connected to the input terminal of the integration circuit; and is used to acquire the voltage value of the battery; The output end of the integration circuit outputs the current discharge capacity of the battery; The monitoring circuit is used to determine the current current value according to the voltage value and the resistance value in the battery voltage acquisition circuit; and determine the current discharge capacity of the battery according to the relationship between the current value and the time integral.

2. The battery capacity test circuit according to claim 1, characterized in that: The integration circuit includes an integration amplifier, a first resistor, a second resistor and a first capacitor; The voltage output end of the battery voltage collection circuit is connected to the first end of the first resistor; The second end of the first resistor is connected to the first end of the first capacitor and is connected to the inverting input end of the integrating amplifier; The second end of the first capacitor is connected to the output end of the integrating amplifier; And the output end of the integrating amplifier serves as the output end of the integrating circuit; The first end of the second resistor is connected to the non-inverting input end of the integrating amplifier; the second end of the second resistor is grounded.

3. The battery capacity test circuit according to claim 2, characterized in that: Also includes a display circuit; the display circuit includes a first comparator and a display screen; The first input terminal of the first comparator is connected to the output terminal of the integrating amplifier; the power value of the second input terminal of the first comparator is the initial power value of the battery; The output end of the first comparator is connected to the display screen; and is used to determine the current remaining capacity according to the relationship between the current discharge capacity and the initial power of the battery.

4. The battery capacity test circuit according to claim 3, characterized in that: It also includes a reminder circuit; the reminder circuit includes a second comparator and a light emitting diode; The first input terminal of the second comparator is connected to the output terminal of the integrating amplifier; the electric quantity value of the second input terminal of the second comparator is the reference electric quantity; The output end of the second comparator is connected to the anode of the light emitting diode; the cathode of the light emitting diode is grounded; Used to trigger the light emitting diode to operate according to the relationship between the reference power and the current remaining capacity.

5. The battery capacity test circuit according to claim 4, characterized in that: Also includes a buzzer; The buzzer is connected to the output end of the second comparator.

6. The battery capacity test circuit according to claim 4, characterized in that: Also including a third resistor; The first end of the third resistor is connected to the output end of the integrating amplifier; the second end of the third resistor is connected to the anode of the light emitting diode.

7. The battery capacity test circuit according to claim 1, characterized in that: The battery voltage acquisition circuit includes a fourth resistor and a fifth resistor; The positive electrode of the battery is connected to the first end of the fifth resistor; the second end of the fifth resistor is connected to the first end of the fourth resistor, and the common end of the fifth resistor and the fourth resistor serves as the voltage output end of the battery voltage acquisition circuit and is connected to the input end of the integration circuit; A second end of the fourth resistor is grounded and connected to the negative electrode of the battery.

8. The battery capacity test circuit according to claim 7, characterized in that: The resistance value of the fourth resistor is determined by the critical current value of the fifth resistor.

9. A battery capacity testing system, characterized in that: A battery capacity testing circuit comprising the battery capacity testing circuit according to any one of claims 1 to 8.

10. An electric energy meter, characterized in that: A battery capacity testing circuit comprising the battery capacity testing circuit according to any one of claims 1 to 8.

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