CN214750732U - Intelligent battery internal resistance detection circuit - Google Patents
Intelligent battery internal resistance detection circuit Download PDFInfo
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- CN214750732U CN214750732U CN202120231250.1U CN202120231250U CN214750732U CN 214750732 U CN214750732 U CN 214750732U CN 202120231250 U CN202120231250 U CN 202120231250U CN 214750732 U CN214750732 U CN 214750732U
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- internal resistance
- detection circuit
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Abstract
An intelligent battery internal resistance detection circuit comprises an internal battery, a constant current source, a control module, a positive contact and a negative contact, wherein the positive contact and the negative contact are used for being connected with an external battery to be detected; the switch K0 is connected in parallel with a switch K1 and a resistor R1 which are connected in series, the switch K1 is positioned at one side connected with the anode of the internal battery, and the resistor R1 is positioned at one side connected with the anode contact; one end of the constant current source is connected with the common end, and the other end of the constant current source is connected with one end of the resistor R1 used for connecting the switch K1 through the switch K2; two ends of the resistor R1 are respectively provided with a voltage sampling point V1 and a voltage sampling point V2, and the voltage sampling points V1 and V2 are respectively connected with the control module for voltage sampling. The utility model reduces the cost of BOM and improves the processing efficiency; and the circuit has the functions of detecting the voltage of the battery to be detected and outputting reverse connection protection.
Description
Technical Field
The utility model relates to a power internal resistance detects technical field, concretely relates to intelligent battery internal resistance detection circuitry.
Background
Along with the gradual expansion of battery application, the detection of the battery is particularly important, and the detection method not only can be applied to the detection of the battery core of the battery, but also can be applied to the detection of the firmness of the processing technology in the battery pack grouping. What is more important and urgent is that the battery can be accurately detected only by accurately measuring the internal resistance of the battery.
In the prior art, in the detection process of the internal resistance of the battery, an additional compensation circuit is required to be added, namely, an external compensation probe is connected to a main control chip for detection, so that not only is the circuit complicated, but also the measurement accuracy is poor.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model provides an intelligent battery internal resistance detection circuitry to in solving the detection circuitry who is used for the battery internal resistance among the prior art, need additionally increase the compensation circuit, lead to the poor technical problem of internal resistance measuring accuracy.
In order to achieve the purpose, the utility model provides an intelligent battery internal resistance detection circuit, which comprises an internal battery, a constant current source, a control module, a positive contact and a negative contact, wherein the positive contact and the negative contact are used for being connected with an external battery to be detected, the positive electrode and the negative electrode of the internal battery are correspondingly connected with the positive contact and the negative contact, and a switch K0 is connected in series between the positive electrode and the positive contact of the internal battery; the switch K0 is connected in parallel with a switch K1 and a resistor R1 which are connected in series, the switch K1 is positioned at one side connected with the anode of the internal battery, and the resistor R1 is positioned at one side connected with the anode contact; one end of the constant current source is connected with the common end, and the other end of the constant current source is connected with one end of the resistor R1 used for connecting the switch K1 through the switch K2; two ends of the resistor R1 are respectively provided with a voltage sampling point V1 and a voltage sampling point V2, and the voltage sampling points V1 and V2 are respectively connected with the control module for voltage sampling.
As a further preferable technical solution of the present invention, the switch K0, the switch K1 and the switch K2 are all controlled by the control module.
As a further preferred technical scheme of the utility model, switch K0, switch K1 and switch K2 are relay switches.
As a further preferred technical scheme of the utility model, inside battery is the lithium cell group, and the lithium cell group includes the electric core that two sections at least establish ties mutually.
As a further preferred technical scheme of the utility model, the battery that awaits measuring is lead acid battery.
As a further preferred technical scheme of the utility model, control module is supplied power by internal battery, and control module's power supply input and internal battery just, the negative pole is connected.
As a further preferred technical scheme of the utility model, be equipped with the digital display table on the control module.
As a further preferred technical scheme of the utility model, intelligent battery internal resistance detection circuitry still includes auxiliary power supply, and auxiliary power supply is connected with the positive pole of inside battery.
As the utility model discloses a further preferred technical scheme, intelligent battery internal resistance detection circuitry still includes output sampling circuit, and control module flows through the electric current size of anodal contact through this output sampling circuit sampling.
The intelligent battery internal resistance detection circuit of the utility model utilizes the voltage difference generated by the internal resistance of the battery core of the internal battery under the instantaneous heavy current as the judgment basis, rather than only using the actual voltage of the battery core of the internal battery as the reference, thereby theoretically ensuring the safety of the internal battery; meanwhile, the device has the function of detecting a battery to be detected (an automobile lead-acid storage battery), so that the health state of the automobile lead-acid storage battery can be monitored; the influence of loop resistance is skillfully eliminated by using the design of controllable charging and discharging of the battery to be measured, compared with the existing design, a compensation circuit is not needed in the process of measuring the battery to be measured, the removal of the compensation circuit reduces the cost of BOM and improves the processing efficiency; and simultaneously, the utility model discloses a detection circuitry still has the effect that detects the battery voltage that awaits measuring and has the function that the protection is connect in reverse in output, and furthest has improved the security of product and user's use and has experienced the sense.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic block diagram of an example provided by the smart battery internal resistance detection circuit of the present invention;
fig. 2 is an equivalent circuit diagram of an example provided by the smart battery internal resistance detection circuit of the present invention.
The purpose of the present invention is to provide a novel and improved method and apparatus for operating a computer.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description. In the preferred embodiments, the terms "upper", "lower", "left", "right", "middle" and "a" are used for the sake of clarity only, and are not intended to limit the scope of the invention, its relative relationship between the terms and their derivatives, and the scope of the invention should be understood as being limited by the claims.
As shown in fig. 1, the utility model provides an intelligent battery internal resistance detection circuitry, including internal battery, constant current source, control module to and be used for the positive pole contact and the negative pole contact of being connected with outside battery that awaits measuring, in this embodiment, internal battery is lithium cell group, and lithium cell group includes the electric core of two section at least series connection mutually, and the battery that awaits measuring is the lead acid battery on the car.
The positive and negative poles of the internal battery are correspondingly connected with the positive and negative pole contacts, and a switch K0 is connected in series between the positive pole and the positive pole contact of the internal battery; the switch K0 is connected in parallel with a switch K1 and a resistor R1 which are connected in series, the switch K1 is positioned at one side connected with the anode of the internal battery, and the resistor R1 is positioned at one side connected with the anode contact; one end of the constant current source is connected with the common end, and the other end of the constant current source is connected with one end of the resistor R1 used for connecting the switch K1 through the switch K2; two ends of the resistor R1 are respectively provided with a voltage sampling point V1 and a voltage sampling point V2, and the voltage sampling points V1 and V2 are respectively connected with the control module for voltage sampling; the switch K0, the switch K1 and the switch K2 are all controlled by the control module, and the control module controls the on-off of the switch K0, the switch K1 and the switch K2 to change the loop states of the batteries to be tested, so that the internal resistance of the batteries to be tested is detected.
In one embodiment, the intelligent battery internal resistance detection circuit further comprises an auxiliary power supply and an output sampling circuit, wherein the auxiliary power supply is connected with the positive electrode of the internal battery, and the control module samples the current flowing through the positive electrode contact through the output sampling circuit.
In another embodiment, the smart battery internal resistance detection circuit further comprises a control module for sampling the current flowing through the positive contact through the output sampling circuit.
Specifically, the switch K0, the switch K1 and the switch K2 are all relay switches, so that automatic on-off control can be realized through an internal program of the control module. The control module is powered by an internal battery, and the power supply input end of the control module is connected with the positive pole and the negative pole of the internal battery. And the control module is also provided with a digital display meter which is used for displaying the relevant parameters and the detection data of the control module.
In order to make the technical solution of the present invention further understood by those skilled in the art, the working principle of the present invention is detailed below:
suppose that: the circuit loop resistance is Ro, and the internal resistance of the battery to be tested is Ro; the current sampling resistance R1 is set to 10 Ω, and the constant current source current Io is set to 0.1A.
The intelligent battery internal resistance detection circuit is used for an equivalent circuit for detection, as shown in fig. 2, the detection process is divided into three steps to detect the voltages of voltage sampling points V1 and V2 respectively, and K0 is kept disconnected in the whole test process, wherein:
firstly, when K1 and K2 are disconnected, measuring voltages of points V1 and V2, wherein the measured voltage is the initial voltage of the battery to be measured, the measured voltage of the point V1 is V1a, the voltage of the point V2 is V2a, and V1a is V2 a;
secondly, when the K1 is turned off and the K2 is turned on, the voltages of points V1 and V2 are measured respectively, at the moment, the voltage of a point V1 is measured to be V1b, the voltage of a point V2 is measured to be V2b, and V1b is equal to V2 b;
and thirdly, when the K2 is disconnected and the K1 is connected, the voltages of points V1 and V2 are measured respectively, at the moment, the voltage of a point V1 is measured to be V1c, the voltage of a point V2 is measured to be V2c, V1c is equal to V2c, and meanwhile, the current detected by the output sampling circuit is I1.
In conjunction with the equivalent circuit diagram of fig. 2, the following derived formula can be obtained:
I1＝(V2c-V1c)/R1 (1)
V2c＝I1*Ro+I1*ro+V2a (2)
V2b＝V2a-Io*Ro-I1*ro (3)
the formula (2) can be derived:
Ro＝V2c-(I1*ro+V2a)/I1 (4)
the following equations (3) and (4) can be derived:
ro＝(V2a*R1+V1c*(V2b-1)+V2c(1-V2b-(Io+1)*R1))/2Io*(V2c-V1c) (5)
substituting the parameters Io and R1 into 10 Ω to obtain:
ro＝(V2a*10+V1c*(V2b-1)+V2c(1-V2b-(0.1+1)*10))/2*0.1*(V2c-V1c)＝(10V2a+V1c*(V2b-1)+V2c(1V2b-11))/0.2*(V2c-V1c)＝(50V2a+5V1c*(V2b-1)+5V2c(1-V2b-11))/(V2c-V1c) (6)
the above derived formula is analyzed to find that:
a, (6) the resistance parameter of the loop is not measured, namely the influence of the loop resistance on the internal resistance of the starting power supply is eliminated theoretically;
B. by testing the voltage values at the two ends (voltage sampling points V1 and V2) of the sampling resistor R1, the internal resistance Ro of the battery to be tested can be accurately measured, and therefore the detection and judgment of the battery to be tested can be realized.
And (4) conclusion: through the equivalent circuit, the control module is adopted to control the switches K0, K1 and K2 respectively, so that the internal resistance of the battery to be measured can be well measured, the quality of the battery can be conveniently judged according to the internal resistance, and the purpose of measuring the quality of the battery to be measured is achieved.
In the embodiment, the voltage difference generated by the internal resistance of the battery cell of the internal battery under the instantaneous large current is used as a judgment basis, rather than only the actual voltage of the battery cell of the internal battery as a reference, so that the safety of the internal battery is ensured theoretically; meanwhile, the device has the function of detecting the battery to be detected (the automobile lead-acid storage battery), so that the health state of the automobile lead-acid storage battery can be monitored.
The embodiment also utilizes the design of controllable charging and discharging of the battery to be measured, and skillfully eliminates the influence of loop resistance, compared with the existing design, a compensation circuit is not needed in the process of measuring the battery to be measured, and the removal of the compensation circuit reduces the cost of BOM, thereby improving the processing efficiency; meanwhile, the detection circuit of the embodiment also has the functions of detecting the voltage of the battery to be detected and outputting reverse connection protection, and the safety of the product and the use experience of a user are improved to the maximum extent.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many changes and modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.
Claims (9)
1. An intelligent battery internal resistance detection circuit is characterized by comprising an internal battery, a constant current source, a control module, a positive electrode contact and a negative electrode contact, wherein the positive electrode contact and the negative electrode contact are used for being connected with an external battery to be detected; the switch K0 is connected in parallel with a switch K1 and a resistor R1 which are connected in series, the switch K1 is positioned at one side connected with the anode of the internal battery, and the resistor R1 is positioned at one side connected with the anode contact; one end of the constant current source is connected with the common end, and the other end of the constant current source is connected with one end of the resistor R1 used for connecting the switch K1 through the switch K2; two ends of the resistor R1 are respectively provided with a voltage sampling point V1 and a voltage sampling point V2, and the voltage sampling points V1 and V2 are respectively connected with the control module for voltage sampling.
2. The smart battery internal resistance detection circuit according to claim 1, wherein the switch K0, the switch K1 and the switch K2 are all controlled by a control module.
3. The smart battery internal resistance detection circuit according to claim 2, wherein the switch K0, the switch K1 and the switch K2 are all relay switches.
4. The intelligent battery internal resistance detection circuit according to claim 1, wherein the internal battery is a lithium battery pack comprising at least two cells connected in series.
5. The intelligent battery internal resistance detection circuit according to claim 1, wherein the battery under test is a lead-acid battery.
6. The intelligent battery internal resistance detection circuit according to claim 1, wherein the control module is powered by an internal battery, and the power supply input terminal of the control module is connected with the positive electrode and the negative electrode of the internal battery.
7. The intelligent battery internal resistance detection circuit according to claim 1, wherein a digital display meter is provided on the control module.
8. The intelligent battery internal resistance detection circuit according to any one of claims 1 to 7, further comprising an auxiliary power supply connected to the positive electrode of the internal battery.
9. The intelligent battery internal resistance detection circuit according to any one of claims 1 to 7, further comprising an output sampling circuit, wherein the control module samples the magnitude of the current flowing through the positive contact through the output sampling circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120231250.1U CN214750732U (en) | 2021-01-27 | 2021-01-27 | Intelligent battery internal resistance detection circuit |
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| CN202120231250.1U CN214750732U (en) | 2021-01-27 | 2021-01-27 | Intelligent battery internal resistance detection circuit |
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| CN214750732U true CN214750732U (en) | 2021-11-16 |
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