CN213364991U - Battery internal resistance tester - Google Patents
Battery internal resistance tester Download PDFInfo
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- CN213364991U CN213364991U CN202021745757.0U CN202021745757U CN213364991U CN 213364991 U CN213364991 U CN 213364991U CN 202021745757 U CN202021745757 U CN 202021745757U CN 213364991 U CN213364991 U CN 213364991U
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Abstract
The application discloses internal resistance tester of battery for solve current test instrument very inconvenient when testing single section battery internal resistance, and influence the technical problem of test result accuracy easily. This internal resistance of battery tester includes: the balance port jacks are connected with a plurality of balance port plugs of the battery pack through a plurality of balance wires; the channel switches are connected with the polarity change-over switch through the first signal lines and the second signal lines and are used for gating balance lines at the two ends of the anode and the cathode of the battery to be tested; the first instrument amplifier is connected with the polarity change-over switch and used for amplifying a first voltage signal generated on the internal resistance of the battery to be detected; and the main control unit is used for providing a test signal for the battery pack and determining the internal resistance value of the battery to be tested based on the first voltage signal. This application has realized the test to single section battery internal resistance through above-mentioned tester, has guaranteed the convenience of test process and the accuracy of test result simultaneously.
Description
Technical Field
The application relates to the technical field of battery testing, in particular to a battery pack internal resistance tester.
Background
As lithium batteries are used more and more widely, there is a growing need to manufacture battery packs using lithium batteries. Because the voltage of a single lithium battery is low, when the lithium battery pack is used, a plurality of batteries are often connected in series to obtain higher voltage. However, because the characteristics of each battery are not completely consistent, a damaged fallen section can appear in the using process, and if the damaged fallen section cannot be found in time, the service life of the whole battery pack can be influenced. And testing the internal resistance of the battery becomes an effective means for finding the fallen sections.
However, the wiring of the battery pack is complicated, so that the internal resistance of each battery is very inconvenient to test by using the existing battery pack internal resistance testing instrument, the accuracy of a measuring result is easily influenced by improper operation, and even the battery is damaged.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a battery pack internal resistance tester for solving the technical problems that the existing tester is very inconvenient in testing the internal resistance of a single battery and the accuracy of a test result is easily influenced.
The embodiment of the application provides a group battery internal resistance tester, the tester includes: the balance port jacks are connected with a plurality of balance port plugs of the battery pack through a plurality of balance wires; the battery pack is formed by connecting a preset number of single batteries in series; the positive and negative ends of a single battery respectively comprise a balance port plug; the channel switches are connected with the polarity change-over switch through the first signal lines and the second signal lines and are used for gating balance lines at the two ends of the anode and the cathode of the battery to be tested; the first instrument amplifier is connected with the polarity change-over switch and used for amplifying a first voltage signal generated on the internal resistance of the battery to be detected; and the main control unit is used for providing a test signal for the battery pack and determining the internal resistance value of the battery to be tested based on the first voltage signal.
According to the battery pack internal resistance tester provided by the embodiment of the application, the testing signals provided by the main control unit generate alternating current voltage drop on the plurality of single batteries, then the balancing lines corresponding to the batteries to be tested are gated through the channel switches, the alternating current voltage drop generated on the internal resistance of the batteries to be tested is led out and then amplified, and then the internal resistance value of the batteries to be tested is obtained. The mode that a balance port is added to obtain the alternating current voltage drop generated on the internal resistance is added to the original tester, so that the internal resistance tester of the battery pack is more convenient to test the internal resistance. And complex wiring is not needed, so that the complexity of the tester for operation is reduced. In addition, the internal resistance value is obtained through the alternating current voltage drop generated on the internal resistance, and the accuracy of the obtained internal resistance value is also ensured.
In one implementation manner of the present application, the tester further includes a digital-to-analog conversion module; the first input end of the digital-to-analog conversion module is connected with the main control unit, and the first output end of the digital-to-analog conversion module is connected with the input end of the low-pass filter and used for converting the test signal sent by the main control unit from a digital signal into an analog signal; the test signal is a sine wave signal; the low-pass filter is used for filtering clutter in the sine wave signal; the output end of the low-pass filter is connected with the input end of the constant-current power amplifying circuit; the output end of the constant current power amplifying circuit is connected with one end of the reference resistor; the other end of the reference resistor is connected with one end of the first capacitor; the other end of the first capacitor is connected with a positive test clamp of the tester; the positive test clip is used to connect the positive pole of the battery pack.
In one implementation of the present application, the tester further comprises a second instrumentation amplifier; the second instrumentation amplifier adopts AD 620; the second instrument amplifier is connected in parallel at two ends of the reference resistor and is used for amplifying a second voltage signal generated on the reference resistor; the output end of the second instrument amplifier is connected with the first input end of the selection switch and is simultaneously connected with the constant-current power amplification circuit.
The tester provided by the embodiment of the application further comprises the reference resistor, and under the condition that the resistance value of the reference resistor is determined, the internal resistance value of the battery can be accurately obtained according to the voltage value of the second voltage signal generated on the reference resistor and the voltage value of the first voltage signal generated on the internal resistance of the battery, so that the accuracy of the test result of the internal resistance of the battery is further ensured. In addition, the second instrument amplifier is connected with the constant current power amplifying circuit, and can send a second voltage signal generated on the reference resistor into the constant current power amplifying circuit, so that the output of the constant current power amplifying circuit is determined to be a constant current signal under the condition that the voltage value of the second voltage signal is stable and inconvenient, and the signal output by the constant current power amplifying circuit is further ensured to be the constant current signal. The battery resistance value is determined by the voltage generated by the constant current signal through the battery resistor, so that the accuracy of the battery internal resistance test result is further ensured.
In one implementation manner of the present application, the plurality of channel switches are connected to the first signal line and the second signal line at intervals, and are configured to send a first voltage signal generated on the internal resistance of the battery to be tested to the polarity switch through the first signal line and the second signal line; the first signal line is connected with the first input end of the polarity switch and is simultaneously connected with the fourth input end of the polarity switch; the second signal wire is connected with the second input end of the polarity change-over switch, is simultaneously connected with the third input end of the polarity change-over switch, and is simultaneously connected with the negative test clamp of the tester; the negative test clip is used to connect the negative pole of the battery.
In one implementation of the present application, the polarity switch includes a first blade, a second blade; the first knife switch is connected with the first output end of the polarity change-over switch and is used for selecting the first input end or the second input end of the polarity change-over switch to be communicated with the first output end; the second knife switch is connected with the second output end of the polarity change-over switch and is used for selecting the connection of the third input end or the fourth input end of the polarity change-over switch and the second output end; the first output end of the polarity switch is connected with one end of the second capacitor; the other end of the second capacitor is connected with a first input end of the first instrument amplifier; the second output end of the polarity switch is connected with one end of the third capacitor; the other end of the third capacitor is connected with the second input end of the first instrument amplifier; the output end of the first instrument amplifier is connected with the second input end of the selection switch; the first instrumentation amplifier employs an AD 620.
In one implementation of the present application, the output terminal of the selection switch is connected to the input terminal of the variable multiple amplifier; the output end of the variable multiple amplifier is connected with the input end of the band-pass filter; the output end of the band-pass filter is connected with the second input end of the digital-to-analog conversion module; the second output end of the digital-to-analog conversion module is connected with the main control unit; the variable multiple amplifier is used for amplifying the first voltage signal or the second voltage signal output by the selection switch by a preset multiple; the selection switch uses CD 4053.
In one implementation of the present application, the tester further includes a voltage measurement circuit; the voltage measurement circuit includes: a voltage gear selector switch; the first input end of the voltage gear selector switch is connected with the first output end of the polarity selector switch; the second input end of the voltage gear selector switch is connected with the second output end of the polarity selector switch; the output end of the voltage gear selector switch is connected with the input end of the voltage digital-to-analog converter; the output end of the voltage digital-to-analog converter is connected with the optical coupler; the optical coupler is also connected with the main control unit; a voltage stabilizing circuit; the voltage stabilizing circuit is connected with an isolation power supply through a transformer and used for supplying power for the voltage measuring circuit.
The battery internal resistance tester provided by the embodiment of the application can also be used for testing the voltage of the battery in the process of testing the internal resistance of the battery. The voltage measuring circuit obtains the voltages at two ends of the battery to be measured through two output ends of the polarity switching switch, and further the voltage measuring process is achieved. The timeliness of finding the rear battery is further guaranteed through voltage measurement, and the longer service life of the whole battery pack is further guaranteed.
In one implementation of the present application, the voltage step selector switch employs CD 4052; the voltage digital-to-analog converter adopts MCP 3421; the optical coupler employs 6N 137.
In one implementation manner of the present application, the polarity switch and the plurality of channel switches both use preset analog switches; presetting the analog switch includes: the photoelectric coupler comprises a first switching tube, a second switching tube and a photoelectric coupler; the photoelectric coupler adopts PC 817; the first switch tube and the second switch tube are both made of FDC 2612; the first end of the first switch tube is connected with the anode of the first diode, and is simultaneously connected with the first end of the second switch tube and one end of the first resistor; the second end of the first switch tube is connected with the cathode of the first diode and is simultaneously connected with the first port of the preset analog switch; the third end of the first switch tube is connected with the third end of the second switch tube and is also connected with the other end of the first resistor; the other end of the first resistor is also connected with a fourth pin of the photoelectric coupler; the first end of the second switching tube is also connected with the anode of the second diode; the second end of the second switch tube is connected with the cathode of the second diode and is also connected with the second port of the preset analog switch; a first pin of the photoelectric coupler is connected with a +5V power supply; a third pin of the photoelectric coupler is connected with one end of a fourth capacitor and is simultaneously connected with a cathode of a third diode; the other end of the fourth capacitor is connected with the first end of the first switching tube and is also connected with one end of the secondary coil of the transformer; the anode of the third diode is connected with the other end of the secondary coil of the transformer; the primary coil of the transformer is connected with an isolation power supply.
In an implementation manner of the present application, the preset analog switch further includes a third switching tube; the first end of the third switching tube is connected with one end of the second resistor; the other end of the second resistor is connected with a second pin of the photoelectric coupler; the second end of the third switching tube is connected with one end of a third resistor; the other end of the third resistor is connected with the main control unit and used for accessing a high-level signal; the third end of the third switching tube is grounded; the third switch tube adopts a triode 8050.
The plurality of channel switches and the polarity change-over switch in the battery pack internal resistance tester provided by the embodiment of the application all adopt the pre-designed analog switches. In the preset analog switch, when the second end of the third switch tube is connected with a high level signal, the first switch tube and the second switch tube are conducted through the photoelectric coupler, and then the first port and the second port of the preset analog switch are conducted. The preset analog switch is used as a channel switch and a polarity change-over switch, the channel switches at two ends of the battery to be tested can be selected, the polarity change-over switch is switched on, and other channel switches are switched off, so that only the alternating current voltage drop generated on the internal resistance of the battery to be tested and the voltage of the battery to be tested are sent to the main control unit without the interference of the voltages on other batteries, and the accuracy of the resistance and the voltage measurement of the battery to be tested is further ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic diagram illustrating a connection relationship between internal circuits of a battery internal resistance tester according to an embodiment of the present application;
fig. 2 is a schematic diagram of a connection relationship of an internal circuit of an analog switch according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The existing lithium battery pack is often composed of a plurality of lithium batteries connected in series to obtain higher battery voltage. In the using process, because the characteristics of each single battery are not completely consistent, after repeated recycling, individual batteries become the rear sections, and the service life of the whole battery pack is further influenced.
Measuring the internal resistance and voltage of the battery is a commonly used important means for determining the section after the battery falls. However, the conventional battery internal resistance tester has the disadvantages that the operation of testing each battery is very inconvenient due to complex wiring, and certain experience or requirements are provided for users. Improper operation can also affect the accuracy of the measurement results and even damage the battery.
The embodiment of the application provides a battery pack internal resistance tester to solve the technical problems that the existing tester is inconvenient to test the internal resistance of a single battery and the accuracy of a test result is easily influenced.
The technical solutions proposed in the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a connection relationship between internal circuits of a battery internal resistance tester according to an embodiment of the present application. As shown in fig. 1, the battery pack is formed by connecting n single batteries in series, and the positive and negative ends of each single battery comprise a balance port plug.
As shown in fig. 1, the battery internal resistance tester includes a plurality of balance port sockets, and a plurality of balance port plugs included in the battery pack are connected through balance lines.
Furthermore, the battery pack internal resistance tester also comprises a plurality of channel switches; one end of the channel switch is connected with the balance line, and the other end of the channel switch is connected to the signal bus.
Specifically, a plurality of channel switches are connected to the first signal line and the second signal line at intervals. For example, the balanced lines at the positive and negative terminals of the battery 1 are connected to the channel switch K1 and the channel switch K2, respectively, so that the channel switch K1 is connected to the first signal line and the channel switch K2 is connected to the second signal line.
Furthermore, the first signal line is connected with the first input end of the polarity switch and is simultaneously connected with the fourth input end of the polarity switch; the second signal line is connected with the second input end of the polarity switch and is simultaneously connected with the third input end of the polarity switch. The first output end of the polarity change-over switch is connected with the first input end of the first instrument amplifier, and the second output end of the polarity change-over switch is connected with the second input end of the first instrument amplifier;
in one embodiment of the application, the first instrumentation amplifier is used for amplifying a second voltage signal generated on the internal resistance of the battery to be tested; and the polarity switch is used for ensuring that the first voltage signal input into the first instrumentation amplifier is a positive signal.
Further, the battery pack internal resistance tester comprises a positive tester and a negative test clamp. Wherein the positive test clip is connected to the first signal line through the switch K +, and the negative test clip is connected to the second signal line through the switch K-.
During testing, the positive test clip is used for connecting the positive pole of the battery pack, and the negative test clip is used for connecting the negative pole of the battery pack.
As shown in fig. 1, the battery internal resistance tester provided in the embodiment of the present application further includes a main control unit, configured to generate a test signal.
In one embodiment of the present application, the test signal is a sine wave signal.
As shown in fig. 1, the main control unit is connected to the digital-to-analog conversion module. Specifically, a first input end of the digital-to-analog conversion module is connected with the main control unit, and a first output end of the digital-to-analog conversion module is connected with an input end of the low-pass filter and used for converting the test signal generated by the main control unit from a digital signal to an analog signal.
Furthermore, the output end of the low-pass filter is connected with the input end of the constant-current power amplifying circuit and used for filtering noise waves in the test signal.
Furthermore, the output end of the constant current power amplifying circuit is connected with one end of the reference resistor RF and used for outputting the test signal after constant current processing; the other end of the reference resistor RF is connected to one end of a first capacitor C1; the other end of the first capacitor C1 is connected to the positive test clip of the tester.
Furthermore, a second instrumentation amplifier is connected in parallel to two ends of the reference resistor RF; and a second instrumentation amplifier is used to amplify a second voltage signal generated across the reference resistor RF.
In an embodiment of the present application, the output terminal of the second table amplifier is further connected to the constant current power amplifying circuit, and is configured to send the second voltage signal generated on the reference resistor RF to the constant current power amplifying circuit, so as to determine that the test signal output by the constant current power amplifying circuit is the constant current signal.
Furthermore, the output end of the second instrument amplifier is connected with the first input end of the selection switch and used for sending the amplified second voltage signal to the selection switch.
As shown in fig. 1, the first output terminal of the polarity switch is connected to one terminal of the second capacitor C2, and the other terminal of the second capacitor C2 is connected to the first input terminal of the first instrumentation amplifier; the second output end of the polarity switch is connected with one end of a third capacitor C3, and the other end of the third capacitor C3 is connected with the second input end of the first instrumentation amplifier; the output end of the first instrument amplifier is connected with the second input end of the selection switch and used for amplifying a first voltage signal generated on the internal resistance of the battery to be detected and sending the amplified first voltage signal to the selection switch.
Furthermore, the output end of the selection switch is connected with the input end of the variable multiple amplifier and is used for sending the first voltage signal or the second voltage signal to the variable multiple amplifier; the variable multiple amplifier is used for amplifying the first voltage signal or the second voltage signal sent by the selection switch by a preset multiple.
It should be noted that the variable power amplifier selects an appropriate amplification factor to amplify the input voltage signal based on the difference of the input voltage signal, and may be implemented by an existing hardware connection, for example, the operational amplifier NE5534 is connected to the selector CD 4053. The embodiments of the present application are not described herein in detail.
Furthermore, the output end of the variable multiple amplifier is connected with the input end of the band-pass filter, and the output end of the band-pass filter is connected with the second input end of the digital-to-analog conversion module; the second output end of the digital-to-analog conversion module is connected with the main control unit and used for converting the first voltage signal or the second voltage signal output by the band-pass filter into a digital signal through an analog signal and sending the converted digital signal to the main control unit so that the main control unit can determine the internal resistance value of the battery to be tested.
In an embodiment of the present application, the battery internal resistance tester further includes a voltage measurement circuit, connected to the main control unit, for testing a voltage value of the battery to be tested.
As shown in fig. 1, the voltage measuring circuit includes a voltage step-change switch. The first input end of the voltage gear selector switch is connected with the first output end of the polarity selector switch, and the second input end of the voltage gear selector switch is connected with the second output end of the polarity selector switch; the output end of the voltage gear shifting switch is connected with a voltage digital-to-analog converter and used for selecting a proper measuring range based on the first voltage signal so as to ensure enough resolution.
Further, the output end of the voltage digital-to-analog converter is connected with the optical coupler; the optical coupler is connected with the main control unit and used for converting the electrical relation into the photoelectric relation so as to improve the voltage resistance of the voltage measuring circuit.
Furthermore, the voltage measuring circuit further comprises a voltage stabilizing circuit, and the voltage stabilizing circuit is connected with the isolated power supply through a transformer and used for supplying power to the voltage measuring circuit.
In one embodiment of the present application, the internal resistance test process of the battery to be tested is as follows:
the main control unit sends out sine wave signals, and the sine wave signals are sent to a low-pass filter for filtering through the output end of the digital-to-analog converter; the filtered sine wave signal passes through a constant current power amplifying circuit and then outputs a constant current signal, and a second voltage signal is generated on the reference resistor RF.
After the constant current signal is isolated from the direct current signal by the first resistor C1, the constant current signal is sent into the battery pack by the positive test clamp, and alternating current voltage drop is generated on the internal resistance of the battery to be tested, namely the first voltage signal.
Furthermore, the channel switches at the two ends of the anode and the cathode of the battery to be tested are switched on, and a first voltage signal generated on the internal resistance of the battery to be tested is sent to the first instrument amplifier for amplification through the first signal line and the second signal line.
Furthermore, the selection switch selects the first voltage signal amplified by the first instrumentation amplifier or the second voltage signal amplified by the second instrumentation amplifier, and the first voltage signal or the second voltage signal is sent to the variable multiple amplifier to be amplified by a preset multiple and then sent to the main control unit through the band-pass filter and the digital-to-analog conversion module.
Furthermore, the main control unit determines the internal resistance value of the battery to be tested based on the input first voltage signal and the input second voltage signal.
And finishing the internal resistance testing process of the battery to be tested.
As will be apparent to those skilled in the art, a battery pack includes n single cells, where n is a positive integer. The battery to be tested is any one of the n single batteries. In the test process, only the channel switches connected with the two ends of the anode and the cathode of the battery to be tested need to be conducted.
It should be further noted that, when the voltage value of the battery to be tested is tested, only the first voltage signal output by the polarity switch needs to be introduced into the voltage measurement circuit.
In one embodiment of the application, the first instrumentation amplifier and the second instrumentation amplifier both adopt AD 620; the selection switch adopts CD 4053; the voltage gear selector switch adopts CD 4052; the voltage digital-to-analog converter adopts MCP 3421; the optical coupler used 6N 137.
In one embodiment of the present application, the polarity switch and the channel switches are all designed in advance to be analog switches. For convenience of description, in the embodiments of the present application, the pre-designed analog switch is referred to as a preset analog switch.
Fig. 2 is a schematic diagram of a connection relationship of an internal circuit of an analog switch according to an embodiment of the present disclosure.
As shown in fig. 2, the preset analog switch includes a first switch Q1, a second switch Q2, and a photo coupler. A first end of the first switch tube Q1 is connected to a first end of the second switch tube Q2, and is also connected to one end of the first resistor R1, and is also connected to the anode of the first diode D1; the second end of the first switch tube Q1 is connected to the cathode of the first diode D1, and is also connected to the first port of the preset analog switch; the third terminal of the first switch transistor Q1 is connected to the third terminal of the second switch transistor Q2, and is also connected to the other terminal of the first resistor R1.
Further, the first end of the second switch Q2 is also connected to the anode of the second diode D2; the second terminal of the second switch Q2 is connected to the cathode of the second diode D2 and to the second port of the preset analog switch.
Furthermore, the other end of the first resistor R1 is also connected to the fourth pin of the photocoupler.
Further, a first pin of the photoelectric coupler is connected with a +5V power supply; a third pin of the photoelectric coupler is connected with one end of a fourth capacitor C4 and is simultaneously connected with a cathode of a third diode D3; the other end of the fourth capacitor C4 is connected to the first end of the first switch tube Q1 and to one end of the secondary winding of the transformer; the other end of the secondary winding of the transformer is connected to the anode of a third diode D3.
Furthermore, the primary coil of the transformer is connected with an isolation power supply for providing a starting voltage for the preset analog switch.
As shown in fig. 2, the preset analog switch further includes a third switching tube Q3. The first end of the third switching tube Q3 is connected with one end of the second point resistor R2, and the other end of the second resistor R2 is connected with the second pin of the photoelectric coupler; the second end of the third switch tube Q3 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the main control unit, for accessing a high level signal to turn on the third switch tube Q3, so that the preset analog switch is turned on. The third terminal of the third switching tube Q3 is grounded.
In one embodiment of the present application, the conduction principle of the preset analog switch is as follows:
when the second terminal of the third transistor Q3 is switched to a high level through the third resistor R3, the third transistor Q3 is turned on. A light emitting diode inside the photoelectric coupler is conducted to emit light; and then the phototriode in the photoelectric coupler is conducted.
Further, after the fourth capacitor C4 of the isolated power supply performs filtering and the third diode D3 performs rectification, a turn-on voltage is provided for the first switch tube Q1 and the second switch tube Q2, so that the first switch tube Q1 and the second switch tube Q2 are turned on, and further the first port and the second port of the preset analog switch are turned on.
In one embodiment of the present application, the first switching tube and the second switching tube are both FDC2612, and the third switching tube is a triode 8050.
In another embodiment of the present application, the photocoupler employs PC 817; the main control unit adopts a singlechip, for example, a Huada HC32L170JAPA singlechip.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. The utility model provides a group battery internal resistance tester, its characterized in that, the tester includes:
the balance port jacks are connected with a plurality of balance port plugs of the battery pack through a plurality of balance wires; the battery pack is formed by connecting a preset number of single batteries in series; the positive and negative ends of the single battery respectively comprise a balance port plug;
the channel switches are connected with the polarity change-over switch through the first signal lines and the second signal lines and are used for gating balance lines at the two ends of the anode and the cathode of the battery to be tested;
the first instrument amplifier is connected with the polarity change-over switch and used for amplifying a first voltage signal generated on the internal resistance of the battery to be detected;
and the main control unit is used for providing a test signal for the battery pack and determining the internal resistance value of the battery to be tested based on the first voltage signal.
2. The battery internal resistance tester of claim 1, wherein the tester further comprises a digital-to-analog conversion module;
the first input end of the digital-to-analog conversion module is connected with the main control unit, and the first output end of the digital-to-analog conversion module is connected with the input end of the low-pass filter and used for converting the test signal sent by the main control unit from a digital signal into an analog signal; the test signal is a sine wave signal; the low-pass filter is used for filtering out clutter in the sine wave signal;
the output end of the low-pass filter is connected with the input end of the constant-current power amplifying circuit; the output end of the constant current power amplifying circuit is connected with one end of the reference resistor; the other end of the reference resistor is connected with one end of the first capacitor; the other end of the first capacitor is connected with a positive test clamp of the tester;
the positive test clip is used to connect the positive pole of the battery pack.
3. The internal resistance tester of battery pack of claim 2, further comprising a second instrumentation amplifier; the second instrumentation amplifier adopts AD 620;
the second instrument amplifier is connected in parallel to two ends of the reference resistor and used for amplifying a second voltage signal generated on the reference resistor;
the output end of the second instrument amplifier is connected with the first input end of the selection switch and is simultaneously connected with the constant current power amplification circuit.
4. The battery internal resistance tester of claim 1,
the channel switches are connected to the first signal line and the second signal line at intervals and used for sending a first voltage signal generated on the internal resistance of the battery to be tested to the polarity change-over switch through the first signal line and the second signal line;
the first signal line is connected with the first input end of the polarity switch and is simultaneously connected with the fourth input end of the polarity switch; the second signal wire is connected with the second input end of the polarity change-over switch, is simultaneously connected with the third input end of the polarity change-over switch, and is simultaneously connected with the negative test clip of the tester;
the negative test clip is used for connecting the negative pole of the battery pack.
5. The battery internal resistance tester of claim 4, wherein the polarity switch comprises a first blade, a second blade;
the first switch blade is connected with the first output end of the polarity change-over switch and is used for selecting the first input end or the second input end of the polarity change-over switch to be communicated with the first output end;
the second knife switch is connected with the second output end of the polarity change-over switch and is used for selecting the third input end or the fourth input end of the polarity change-over switch to be communicated with the second output end;
the first output end of the polarity switch is connected with one end of the second capacitor; the other end of the second capacitor is connected with a first input end of the first instrument amplifier; the second output end of the polarity switch is connected with one end of a third capacitor; the other end of the third capacitor is connected with the second input end of the first instrument amplifier; the output end of the first instrument amplifier is connected with the second input end of the selection switch;
the first instrumentation amplifier employs an AD 620.
6. The internal resistance tester of battery pack according to claim 5,
the output end of the selection switch is connected with the input end of the variable multiple amplifier; the output end of the variable multiple amplifier is connected with the input end of the band-pass filter; the output end of the band-pass filter is connected with the second input end of the digital-to-analog conversion module; the second output end of the digital-to-analog conversion module is connected with the main control unit;
the variable multiple amplifier is used for amplifying the first voltage signal or the second voltage signal output by the selection switch by a preset multiple;
the selection switch adopts CD 4053.
7. The internal resistance tester of battery pack according to claim 1, wherein the tester further comprises a voltage measuring circuit; the voltage measurement circuit includes:
a voltage gear selector switch; the first input end of the voltage gear selector switch is connected with the first output end of the polarity selector switch; the second input end of the voltage gear selector switch is connected with the second output end of the polarity selector switch; the output end of the voltage gear selector switch is connected with the input end of the voltage digital-to-analog converter; the output end of the voltage digital-to-analog converter is connected with the optical coupler; the optical coupler is also connected with the main control unit;
a voltage stabilizing circuit; the voltage stabilizing circuit is connected with an isolation power supply through a transformer and used for supplying power to the voltage measuring circuit.
8. The internal resistance tester of battery pack according to claim 7, wherein the voltage step switch is a CD 4052; the voltage digital-to-analog converter adopts MCP 3421; the optical coupler employs 6N 137.
9. The battery pack internal resistance tester according to claim 1, wherein the polarity switch and the plurality of channel switches each employ a preset analog switch;
the preset analog switch comprises: the photoelectric coupler comprises a first switching tube, a second switching tube and a photoelectric coupler;
the photoelectric coupler adopts a PC 817; the first switch tube and the second switch tube are both made of FDC 2612;
the first end of the first switch tube is connected with the anode of the first diode, and is simultaneously connected with the first end of the second switch tube and one end of the first resistor; the second end of the first switch tube is connected with the cathode of a first diode and is simultaneously connected with the first port of the preset analog switch; the third end of the first switch tube is connected with the third end of the second switch tube and is also connected with the other end of the first resistor; the other end of the first resistor is also connected with a fourth pin of the photoelectric coupler;
the first end of the second switching tube is also connected with the anode of a second diode; the second end of the second switch tube is connected with the cathode of the second diode and is also connected with the second port of the preset analog switch;
a first pin of the photoelectric coupler is connected with a +5V power supply; a third pin of the photoelectric coupler is connected with one end of a fourth capacitor and is simultaneously connected with a cathode of a third diode; the other end of the fourth capacitor is connected with the first end of the first switching tube and is also connected with one end of a secondary coil of the transformer; the anode of the third diode is connected with the other end of the secondary coil of the transformer; and the primary coil of the transformer is connected with an isolated power supply.
10. The battery internal resistance tester of claim 9, wherein the preset analog switch further comprises a third switching tube;
the first end of the third switching tube is connected with one end of the second resistor; the other end of the second resistor is connected with a second pin of the photoelectric coupler; the second end of the third switching tube is connected with one end of a third resistor; the other end of the third resistor is connected with the main control unit and is used for accessing a high-level signal; the third end of the third switching tube is grounded;
the third switch tube adopts a triode 8050.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866657A (en) * | 2021-09-30 | 2021-12-31 | 济南耀锐电子科技有限公司 | Lithium battery internal resistance test system |
| CN113884920A (en) * | 2021-09-30 | 2022-01-04 | 济南耀锐电子科技有限公司 | Battery internal resistance testing system for charge-discharge state |
-
2020
- 2020-08-19 CN CN202021745757.0U patent/CN213364991U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866657A (en) * | 2021-09-30 | 2021-12-31 | 济南耀锐电子科技有限公司 | Lithium battery internal resistance test system |
| CN113884920A (en) * | 2021-09-30 | 2022-01-04 | 济南耀锐电子科技有限公司 | Battery internal resistance testing system for charge-discharge state |
| CN113866657B (en) * | 2021-09-30 | 2023-07-14 | 济南耀锐电子科技有限公司 | Lithium battery internal resistance test system |
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