CN213633756U - Detection system for battery electric quantity - Google Patents

Detection system for battery electric quantity Download PDF

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CN213633756U
CN213633756U CN202022387384.0U CN202022387384U CN213633756U CN 213633756 U CN213633756 U CN 213633756U CN 202022387384 U CN202022387384 U CN 202022387384U CN 213633756 U CN213633756 U CN 213633756U
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voltage
capacitor
pin
power supply
chip
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孙登科
郝占海
邵举红
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Shanghai Liying Information Technology Co ltd
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Shanghai Liying Information Technology Co ltd
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Abstract

The utility model relates to the field of electronic technology, especially, relate to a battery power's detecting system, wherein, include: the detection unit is electrically connected with a battery to detect a current signal of the battery; the input end of the conversion unit is connected with the output end of the detection unit, and the conversion unit converts the current signal into a voltage signal and divides the voltage to form a first voltage division signal and a second voltage division signal; and the first input end of the electric quantity metering unit is connected with the first output end of the conversion unit, the second input end of the electric quantity metering unit is connected with the second output end of the conversion unit so as to detect the difference value between the first voltage division signal and the second voltage division signal, form a differential detection value, and calculate the electric quantity of the battery according to the differential detection value. Has the advantages that: the current signal of the detected battery is converted into a voltage signal, and the voltage is divided to form a first voltage division signal and a second voltage division signal, so that a difference detection value between the first voltage division signal and the second voltage division signal is detected, and the electric quantity of the battery is accurately calculated.

Description

Detection system for battery electric quantity
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a battery power's detecting system.
Background
With the wide application of portable products, more and more products adopt the lithium cell as its main power supply, and the lithium cell has: small volume, high energy density, no memory effect, long cycle life, high voltage battery, low self-discharge rate, environmental protection, no pollution and the like. However, due to the high energy density and the unique chemical characteristics, there are also safety and stability concerns of the lithium ion battery, such as the possibility of combustion and even explosion caused by overcharge, and the possibility of damage to the battery itself caused by overdischarge, so it is very important for the precise monitoring and electric quantity calculation of the lithium ion battery.
In the prior art, the actual capacity of the battery is basically judged according to the voltage, so that the problem that accurate discharge electric quantity cannot be provided in the discharge of the battery is caused. Therefore, the above technical problems are difficult problems to be solved by those skilled in the art.
Disclosure of Invention
In view of the above problems in the prior art, a battery power detection system is provided.
The specific technical scheme is as follows:
the invention provides a detection system for battery capacity, which comprises:
the detection unit is electrically connected with a battery so as to detect and output a current signal of the battery;
the input end of the conversion unit is connected with the output end of the detection unit so as to convert the current signal into a voltage signal and divide the voltage to form a first voltage division signal and a second voltage division signal;
and the first input end of the electric quantity metering unit is connected with the first output end of the conversion unit, the second input end of the electric quantity metering unit is connected with the second output end of the conversion unit so as to detect the difference value between the first voltage division signal and the second voltage division signal, form a differential detection value, and calculate the electric quantity of the battery according to the differential detection value.
Preferably, the detection device further comprises a voltage conversion unit, wherein an output end of the voltage conversion unit is connected with an input end of the detection unit, and is used for converting a high voltage value into a low voltage value and supplying power to the detection unit.
Preferably, the voltage conversion unit includes:
an isolated power supply;
the high power supply voltage end is connected to a first pin of the isolation power supply through a first resistor;
and the low power supply voltage end comprises a positive output end and a negative output end, the second pin of the isolation power supply is connected to the positive output end, and the third pin of the isolation power supply is connected to the negative output end.
Preferably, the electricity metering unit includes an electricity metering chip, and the electricity metering chip includes a first chip pin and a second chip pin.
Preferably, the conversion unit includes a second resistor, the second resistor is connected between the first chip pin and the second chip pin, and one end of the second resistor close to the second chip pin is grounded.
Preferably, the detection unit includes a sensor, a first pin of the sensor is connected to a first chip pin of the electric quantity metering chip, a second pin of the sensor is connected to the positive output terminal, and a third pin of the sensor is connected to the negative output terminal.
Preferably, the electric quantity metering chip passes through I2The C bus is connected to a controller so as to transmit the electric quantity of the battery calculated by the electric quantity metering chip to the controller.
Preferably, the voltage conversion unit further includes:
the first capacitor is connected between the first resistor and the ground;
the second capacitor is connected between the first pin and the fourth pin of the isolation power supply and is connected in parallel with the first capacitor;
the anode of the third capacitor is connected between the second pin of the isolation power supply and the anode output end, and the cathode of the third capacitor is grounded;
the fourth capacitor is connected between the anode of the third capacitor and the ground;
the anode of the fifth capacitor is connected between the cathode of the third capacitor and the ground, and the cathode of the fifth capacitor is connected to the cathode output end;
and the sixth capacitor is connected between the fourth capacitor and the negative electrode output end.
Preferably, the electricity quantity metering unit further includes:
a first power supply voltage terminal connected to the first chip pin of the electric quantity metering chip;
a second power supply voltage terminal;
a protection module connected to the second power supply voltage terminal and the I2C, between the buses.
Preferably, the electricity quantity metering unit further includes:
the seventh capacitor is connected between the second power supply voltage end and the ground;
and the eighth capacitor is connected between the first power supply voltage end and the ground.
The technical scheme has the following advantages or beneficial effects: the current signal of the detected battery is converted into a voltage signal, and is divided into a first voltage division signal and a second voltage division signal, so that a difference detection value between the first voltage division signal and the second voltage division signal is detected, the electric quantity of the battery is accurately calculated according to the difference detection value, and accurate discharge electric quantity can be provided in battery discharge.
Drawings
Fig. 1 is a schematic block diagram of an embodiment of the present invention;
fig. 2 is a circuit diagram of a voltage conversion unit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of the electric quantity measuring unit and the converting unit according to the embodiment of the present invention;
fig. 4 is a schematic diagram of a connection between a sensor and a battery according to an embodiment 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 of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.
The utility model provides a detection system of battery power, as shown in FIG. 1, wherein, include:
a detection unit 1 electrically connected to a battery 10 for detecting and outputting a current signal of the battery 10;
the input end of the conversion unit 2 is connected with the output end of the detection unit 1 so as to convert the current signal into a voltage signal and divide the voltage to form a first voltage division signal and a second voltage division signal;
and a first input end of the electric quantity metering unit 3 is connected with a first output end of the conversion unit 2, a second input end of the electric quantity metering unit 3 is connected with a second output end of the conversion unit 2 so as to detect a difference value between the first voltage division signal and the second voltage division signal, form a difference detection value, and calculate the electric quantity of the battery according to the difference detection value.
In this embodiment, since the electricity metering unit 3 can only detect the voltage signal, after the current signal of the battery 10 to be detected is detected by the detecting unit 1, the current signal needs to be converted into the voltage signal by the converting unit 2, and then divided into the first voltage dividing signal and the second voltage dividing signal to be transmitted to the electricity metering unit 3.
Further, the electric quantity metering unit 3 calculates a difference value between the first voltage division signal and the second voltage division signal through the inside, that is, a differential detection value, and further performs an integral check according to the differential detection value to calculate the electric quantity of the battery 10 to be detected, so that accurate discharge electric quantity can be provided in the discharge process of the battery 10 to be detected.
In a preferred embodiment, the detecting unit further comprises a voltage converting unit 4, wherein an output terminal of the voltage converting unit 4 is connected to an input terminal of the detecting unit 1, and is used for converting a high voltage value into a low voltage value and supplying power to the detecting unit 1.
Specifically, as shown in fig. 2, since the detection unit 1 in the above-mentioned solution needs to be powered by a power source when detecting the current signal of the battery 10, the detection unit 1 is powered by the voltage conversion unit 4.
In this embodiment, a DC \ DC conversion manner is adopted to convert the high voltage value into a low voltage value, that is, the original 24V high voltage value is converted into a 15V low voltage value, and then the 15V low voltage value is transmitted to the detection unit 1, so as to supply power to the detection unit 1.
In a preferred embodiment, as shown in fig. 2, the voltage converting unit 4 includes:
an isolated power supply U1;
a high voltage supply terminal V1, the high voltage supply terminal V1 is connected to the first pin of the isolation power supply U1 through a first resistor R1;
and the low power supply voltage end V2, the low power supply voltage end V2 comprises a positive output end + V2 and a negative output end-V2, a second pin of the isolation power supply U1 is connected to the positive output end + V2, and a third pin of the isolation power supply U1 is connected to the negative output end-V2.
Specifically, in the present embodiment, the voltage at the high power voltage terminal V1 and the voltage at the low power voltage terminal V2 are isolated by using the isolation power source U1, so that the high voltage value of 24V is converted into the low voltage value of 15V.
In a preferred embodiment, the fuel-gauging unit 3 comprises a fuel-gauging chip, and the fuel-gauging chip U2 comprises a first chip pin and a second chip pin.
Specifically, as shown in fig. 1 and 3, the electricity metering unit 3 in the above technical solution includes an electricity metering chip U2, and the model of the electricity metering chip U2 is LTC 2944.
In this embodiment, the first voltage division signal and the second voltage division signal in the above technical solution are respectively transmitted to the first chip pin and the second chip pin of the electric quantity metering chip U2, and both the first chip pin and the second chip pin are differential detection ports to perform differential calculation on the first voltage division signal and the second voltage division signal.
In a preferred embodiment, the converting unit 2 includes a second resistor R2, the second resistor R2 is connected between the first chip pin and the second chip pin, and one end of the second resistor R2 close to the second chip pin is grounded to GND.
Specifically, as shown in fig. 3, the converting unit 2 in the above technical solution may be implemented by one resistor, i.e., a second resistor R2, the second resistor R2 is a high-precision resistor, the high-precision resistor R2 is used to convert the current signal into a voltage signal, and a first voltage-dividing signal and a second voltage-dividing signal are generated at two ends of the second resistor R2, so as to be correspondingly transmitted to the first chip pin and the second chip pin.
In a preferred embodiment, as shown in fig. 1, 3 and 4, the detecting unit 1 includes a sensor CS, a first pin of the sensor CS is connected to a first chip pin of the electricity-measuring chip U2, a second pin of the sensor CS is connected to the positive output terminal + V2, and a third pin of the sensor CS is connected to the negative output terminal-V2.
Specifically, the detecting unit 1 in the above technical solution includes a sensor CS, which is a current output type hall sensor with an accuracy of 0.02%, and detects a current signal of the middle battery 10 through the sensor CS, and connects a first pin of the sensor CS to a first chip pin of the electricity quantity measuring chip U2 to transmit the detected current signal of the battery 10 to the second resistor R2.
In addition, since the hall sensor is connected by positive charging and negative discharging, the first and second divided voltage signals are generated at both ends of the second resistor R2 in the above-described embodiment and are correspondingly transmitted to the first and second chip pins, so that the increase or decrease of the electric quantity of the battery 10 is determined based on the positive or negative of the difference detection value obtained by performing the difference calculation on the first and second divided voltage signals.
In a preferred embodiment, the fuel gauge chip U2 passes through an I2The C bus is connected to a controller 5 to transmit the electric quantity of the battery 10 calculated by the electric quantity measuring chip U2 to the controller 5.
Specifically, as shown in fig. 3, in the present embodiment, the communication mode between the electricity quantity metering chip U2 and the controller 5 is through I2C bus direct communication, so-called I2The C bus is a serial bus formed by a data line SDA and a clock signal line SCL, and can transmit and receive data.
In addition, it should be noted that, in order to maintain a high steady state during the transmission of the communication signal, the controller 5 and the electricity quantity measuring chip U2 must be connected to the same ground in the present embodiment.
In a preferred embodiment, the voltage converting unit 4 further comprises:
a first capacitor C1, the first capacitor C1 is connected between the first resistor R1 and ground GND;
the second capacitor C2, the second capacitor C2 is connected between the first pin and the fourth pin of the isolation power supply U1 and is connected in parallel with the first capacitor C1;
a third capacitor C3, wherein the positive electrode of the third capacitor C3 is connected between the second pin of the isolation power supply U1 and the positive electrode output terminal + V2, and the negative electrode of the third capacitor C3 is grounded to GND;
a fourth capacitor C4, the fourth capacitor C4 is connected between the positive electrode of the third capacitor C3 and the ground GND;
a fifth capacitor C5, wherein the anode of the fifth capacitor C5 is connected between the cathode of the third capacitor C3 and the ground GND, and the cathode of the fifth capacitor C5 is connected to the cathode output terminal-V2;
a sixth capacitor C6, the sixth capacitor C6 is connected between the fourth capacitor C4 and the negative output terminal-V2.
In a preferred embodiment, the fuel gauge unit 3 further comprises:
a first voltage supply terminal V3, the first voltage supply terminal V3 being connected to the first chip pin of the coulometric chip U2;
a second power voltage terminal V4;
a protection module 30, the protection module 30 is connected to the second power voltage terminal V4 and I2C, between the buses.
Specifically, as shown in fig. 3, the power supply voltage input from the first power supply voltage terminal V3 supplies power to the electricity-quantity measuring chip U2, and since the first power supply voltage terminal V3 is connected to the same interface as the first pin of the sensor CS in the above technical solution, the working power supply of the electricity-quantity measuring chip U2 in this embodiment needs to use an independent power supply that is completely isolated from the working power supply of the sensor CS, and the independent power supply is the power supply voltage input from the first power supply voltage terminal V3, and may be + 5V.
Further, in this embodiment, the voltage of the second power voltage terminal V4 is +3.3V to supply power to the protection module 30, the protection module 30 is implemented by three pull-up resistors connected in parallel, where the three resistors are a third resistor R3, a fourth resistor R4, and a fifth resistor R5, respectively, to ensure that the communication signal between the electric quantity metering chip U2 and the controller 5 maintains a high stable state, so as to ensure the communication safety.
In a preferred embodiment, the fuel gauge unit 3 further comprises:
a seventh capacitor C7 connected between the second power voltage terminal V4 and ground GND;
an eighth capacitor C8 is connected between the first power voltage terminal V3 and ground GND.
Specifically, as shown in fig. 3, in the present embodiment, the seventh capacitor C7 is disposed between the second power voltage terminal V4 and the ground GND to stabilize the 3.3V power voltage input from the second power voltage terminal V4, so as to prevent the 3.3V power voltage from fluctuating.
Similarly, an eighth capacitor C8 is disposed between the first power voltage terminal V3 and the ground GND to stabilize the 5V power voltage inputted from the first power voltage terminal V3 and prevent the 5V power voltage from fluctuating.
The above description is only an example of the preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and those skilled in the art should be able to realize the equivalent alternatives and obvious variations of the present invention.

Claims (10)

1. A system for detecting battery charge, comprising:
the detection unit is electrically connected with a battery so as to detect and output a current signal of the battery;
the input end of the conversion unit is connected with the output end of the detection unit so as to convert the current signal into a voltage signal and divide the voltage to form a first voltage division signal and a second voltage division signal;
and the first input end of the electric quantity metering unit is connected with the first output end of the conversion unit, the second input end of the electric quantity metering unit is connected with the second output end of the conversion unit so as to detect the difference value between the first voltage division signal and the second voltage division signal, form a differential detection value, and calculate the electric quantity of the battery according to the differential detection value.
2. The detection system of claim 1, further comprising a voltage conversion unit, wherein an output terminal of the voltage conversion unit is connected to an input terminal of the detection unit for converting a high voltage value into a low voltage value to supply power to the detection unit.
3. The detection system of claim 2, wherein the voltage conversion unit comprises:
an isolated power supply;
the high power supply voltage end is connected to a first pin of the isolation power supply through a first resistor;
and the low power supply voltage end comprises a positive output end and a negative output end, the second pin of the isolation power supply is connected to the positive output end, and the third pin of the isolation power supply is connected to the negative output end.
4. The detection system of claim 3, wherein the electrical-quantity-metering unit comprises an electrical-quantity-metering chip, the electrical-quantity-metering chip comprising a first chip pin and a second chip pin.
5. The detection system according to claim 4, wherein the converting unit includes a second resistor, the second resistor is connected between the first chip pin and the second chip pin, and one end of the second resistor close to the second chip pin is grounded.
6. The detection system of claim 4, wherein the detection unit comprises a sensor, a first pin of the sensor is connected to a first chip pin of the coulometric chip, a second pin of the sensor is connected to the positive output terminal, and a third pin of the sensor is connected to the negative output terminal.
7. The detection system of claim 4, wherein the coulometric chip passes through an I2The C bus is connected to a controller so as to transmit the electric quantity of the battery calculated by the electric quantity metering chip to the controller.
8. The detection system of claim 3, wherein the voltage conversion unit further comprises:
the first capacitor is connected between the first resistor and the ground;
the second capacitor is connected between the first pin and the fourth pin of the isolation power supply and is connected in parallel with the first capacitor;
the anode of the third capacitor is connected between the second pin of the isolation power supply and the anode output end, and the cathode of the third capacitor is grounded;
the fourth capacitor is connected between the anode of the third capacitor and the ground;
the anode of the fifth capacitor is connected between the cathode of the third capacitor and the ground, and the cathode of the fifth capacitor is connected to the cathode output end;
and the sixth capacitor is connected between the fourth capacitor and the negative electrode output end.
9. The detection system of claim 7, wherein the electricity-metering unit further comprises:
a first power supply voltage terminal connected to the first chip pin of the electric quantity metering chip;
a second power supply voltage terminal;
a protection module connected to the second power supply voltage terminal and the I2C, between the buses.
10. The detection system of claim 9, wherein the electricity-metering unit further comprises:
the seventh capacitor is connected between the second power supply voltage end and the ground;
and the eighth capacitor is connected between the first power supply voltage end and the ground.
CN202022387384.0U 2020-10-23 2020-10-23 Detection system for battery electric quantity Active CN213633756U (en)

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Application Number Priority Date Filing Date Title
CN202022387384.0U CN213633756U (en) 2020-10-23 2020-10-23 Detection system for battery electric quantity

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CN213633756U true CN213633756U (en) 2021-07-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115556586A (en) * 2022-10-11 2023-01-03 江苏欧力特能源科技有限公司 Battery module electric quantity estimation device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115556586A (en) * 2022-10-11 2023-01-03 江苏欧力特能源科技有限公司 Battery module electric quantity estimation device
CN115556586B (en) * 2022-10-11 2023-08-22 江苏欧力特能源科技有限公司 Battery module electric quantity estimation device

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