CN220188664U - Battery protection board testing machine and system - Google Patents
Battery protection board testing machine and system Download PDFInfo
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- CN220188664U CN220188664U CN202321954926.5U CN202321954926U CN220188664U CN 220188664 U CN220188664 U CN 220188664U CN 202321954926 U CN202321954926 U CN 202321954926U CN 220188664 U CN220188664 U CN 220188664U
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Abstract
The utility model relates to the field of battery protection boards, in particular to a battery protection board tester which is used for performing activation test, voltage calibration, current calibration, charge test and discharge test on a battery protection board; the device comprises an analog battery cell unit, a main power supply unit, an analog discharging unit and an analog charging unit; the simulation cell unit is connected with the battery protection board and is used for providing a simulation cell for the battery protection board when the activation test, the voltage calibration, the current calibration and the discharge test are carried out; the main power supply unit is connected with the battery protection board and is used for respectively providing load voltage and charging voltage for the battery protection board when the activation test and the charging test are carried out; the simulated discharge unit is connected with the battery protection board and is used for providing load current for the battery protection board when current calibration and discharge test are carried out; the simulated charging unit is connected with the battery protection board and is used for simulating the current of the battery core during the charging test. The utility model has the effects of conveniently testing the battery protection board and avoiding complex flow.
Description
Technical Field
The utility model relates to the field of battery protection boards, in particular to a battery protection board testing machine and a system.
Background
The battery protection board, as the name implies, is mainly an integrated circuit board for protecting rechargeable (generally referred to as lithium battery). The protection required of lithium batteries (rechargeable) is determined by their own characteristics. Because the material of the lithium battery determines that the lithium battery cannot be overcharged, overdischarged, overcurrent, short-circuited and ultrahigh-temperature charged and discharged, the lithium battery assembly always appears along with a protective plate with a sampling resistor and a current protector. At present, the traditional test mode is to test each performance parameter of the battery protection board step by manual work, the test efficiency is low, and whether the test result accords with the standard in the test process is judged by subjective consciousness of testers, and as the judgment standard of each tester has certain difference, the consistency of the factory parameters and the set parameters is difficult to ensure.
Disclosure of Invention
In order to ensure high test efficiency and consistency of test parameters, the utility model provides a battery protection board tester and a system.
The utility model provides a battery protection board testing machine, which adopts the following technical scheme:
in a first aspect, a battery protection board tester is provided for performing an activation test, a voltage calibration, a current calibration, a charge test and a discharge test on a battery protection board;
the device comprises an analog battery cell unit, a main power supply unit, an analog discharging unit and an analog charging unit;
the analog cell unit is connected with the battery protection board and is used for providing an analog cell for the battery protection board when the activation test, the voltage calibration, the current calibration and the discharge test are carried out;
the main power supply unit is connected with the battery protection board and is used for respectively providing load voltage and charging voltage for the battery protection board when the activation test and the charging test are carried out;
the simulated discharge unit is connected with the battery protection board and is used for providing load current for the battery protection board when current calibration and discharge test are carried out;
the simulation charging unit is connected with the battery protection board and is used for simulating the current of the battery cell during the charging test.
Preferably, the analog cell unit comprises a constant voltage source circuit and a battery cell relay circuit; the analog charging unit comprises a constant current source circuit and a charging relay circuit;
when an activation test, a voltage calibration, a current calibration and a discharge test are carried out, the constant voltage source circuit is connected with a battery interface of the battery protection board through the battery core relay circuit.
Preferably, the analog battery cell unit and the analog charging unit further comprise a resistor voltage division circuit and an analog battery cell interface circuit together;
the resistor voltage dividing circuit is used for dividing the output voltage of the constant voltage source circuit;
the battery cell relay circuit and the charging relay circuit are connected with one end of the analog cell interface circuit, and the other end of the analog cell interface circuit is connected with the battery interface of the battery protection plate.
Preferably, the total power supply unit includes: a constant voltage source circuit and a packet relay circuit; the analog discharge unit includes: a constant current source circuit and a discharge relay circuit;
when the charging test is carried out, the constant voltage source circuit is connected with the package interface of the battery protection board through the package relay circuit, and the constant current source circuit is connected with the package interface of the battery protection board through the charging relay circuit.
Preferably, the constant voltage source circuit includes:
the first sampling resistor R1 is used for sampling and obtaining the output voltage of the first power supply end VCC1 and is used as the first output voltage of the constant voltage source circuit; one end of the first sampling resistor R1 is connected with one end of the first power supply end VCC1, and the other end of the first sampling resistor R1 is connected with the input end of the protection unit;
a first differential proportional amplifier for amplifying the first output voltage of the first sampling resistor R1 proportionally; the input end of the first differential proportional amplifier is connected with two ends of the first sampling resistor R1 in a bridging mode, and the output voltage of the first differential proportional amplifier is used as the first input of the first integral proportional amplifier;
a first integrating proportional amplifier for amplifying the reference voltage V ref Comparing the output voltage of the first differential proportional amplifier with the output voltage of the first differential proportional amplifier, and outputting an input signal for controlling the first amplifying unit; the second input end of the first integrating proportional amplifier is connected with a reference voltage source, and the output end of the first integrating proportional amplifier is connected with the input end of the first amplifying unit;
a first amplifying unit for amplifying an output voltage of the first integrating proportional amplifier so that a magnitude of a current flowing through the first variable resistance unit is changed; the first amplifying unit is connected with the first variable resistance unit and the first integrating proportional amplifier;
a first variable resistance unit for changing resistance under joint control of the first amplifying unit and the first control unit; one end of the first variable resistor unit is connected with the positive end of the power supply, the other end of the first variable resistor unit is connected with one end of the first sampling resistor R1, and the third end of the first variable resistor unit is connected with the output end of the first amplifying unit;
a first control unit for controlling a voltage of a third terminal of the first variable resistance unit; one end of the first control unit is connected with the first amplifying unit, and the other end of the first control unit is connected with the third end of the first variable resistance unit;
the protection unit is used for shunting the current acquired by the first sampling resistor R1 when the current acquired by the first sampling resistor R1 exceeds a preset threshold value; one end of the protection unit is connected with one end of the first sampling resistor R1, and the other end of the protection unit is connected with the third end of the first variable resistor unit.
Preferably, the constant current source circuit includes:
the second sampling resistor R2 is used for sampling and obtaining the output voltage of the first power supply end VCC1 and outputting the current of the constant current source circuit; the second sampling resistor R2 is connected between the positive end VCC1+ and the negative end VCC 1-of the first power end VCC1 in a bridging way;
the second differential proportional amplifier is used for amplifying the first voltage output by the second sampling resistor R2 in proportion; the input end of the second differential proportional amplifier is connected with the two ends of the second sampling resistor R2 in a bridging way, and the output voltage of the second differential proportional amplifier is used as the first input of the second integral proportional amplifier;
a second integrating proportional amplifier for outputting a reference voltage V ref Comparing the output voltage of the second differential proportional amplifier with the output voltage of the second differential proportional amplifier, and outputting an input signal for controlling the second amplifying unit; the second input end of the second integrating proportional amplifier is connected with a reference current source, and the output end of the second integrating proportional amplifier is connected with the input end of the second amplifying unit;
a second amplifying unit for amplifying an output voltage of the second integrating proportional amplifier so that a magnitude of a current flowing through the second variable resistance unit is changed; the second amplifying unit is connected with the second variable resistance unit and the second integrating proportional amplifier;
a second variable resistance unit for changing resistance under joint control of the second amplifying unit and the second control unit; one end of the second variable resistance unit is connected with the positive end of the first power supply end VCC1, the other end of the second variable resistance unit is connected with one end of the second sampling resistor R2, and the third end of the second variable resistance unit is connected with the output end of the second amplifying unit;
a second control unit for controlling a voltage of a third terminal of the second variable resistance unit; one end of the second control unit is connected with the second amplifying unit, and the other end of the second control unit is connected with the third end of the second variable resistance unit.
Preferably, the system further comprises an authentication circuit;
the authentication circuit is used for authenticating whether the battery protection board belongs to the battery protection board model which can be tested by the tester, and comprises: the first resistor, the second resistor and the third resistor are sequentially connected in series; the authentication voltage acquisition terminal is led out from the connection part of the second resistor and the third resistor; the short-circuit units are arranged at two ends of the first resistor and are used for controlling whether the first resistor is short-circuited; the third resistor is also connected to the ground GND through an identity authentication resistor.
In a second aspect, there is also provided a battery protection board testing system, including a battery protection board testing machine according to any one of the above technical solutions; the battery protection board also comprises an upper computer and a battery protection board;
the upper computer is connected with the battery protection board testing machine and is used for communicating with the battery protection board testing machine and downloading data;
the battery protection plate further includes: a protective board communication interface; and the upper computer writes working data into the battery protection board through the communication interface.
In summary, the present utility model includes at least one of the following beneficial technical effects:
the utility model realizes the automatic test of various performances of the battery protection board, improves the test efficiency of the battery protection board, and can avoid the difference between factory parameters and set parameters which are easy to cause in manual step-by-step test.
Drawings
FIG. 1 is a logical constitution diagram of a battery protection board tester;
FIG. 2 is a diagram of the logical organization of an analog cell unit;
FIG. 3 is a logical block diagram of a total power supply unit;
FIG. 4 is a diagram of a logical organization of analog discharge cells;
FIG. 5 is a diagram of the logical organization of an analog charging unit;
FIG. 6 is a logic constitution diagram of a constant voltage source circuit;
FIG. 7 is a logic diagram of a constant current source circuit;
FIG. 8 is a diagram of the logic configuration of an authentication circuit;
FIG. 9 is a step diagram of an activation test method performed by a battery protection plate tester;
FIG. 10 is a step diagram of a voltage calibration method performed by a battery protection plate tester;
FIG. 11 is a step diagram of a current calibration method performed by a battery protection plate tester;
FIG. 12 is a step diagram of a method of testing the charge of a battery protection plate tester;
FIG. 13 is a step diagram of a discharge test method performed by a battery protection plate tester;
fig. 14 is a logical configuration diagram of a battery protection board test system.
Reference numerals illustrate: 1. a battery protection board tester; 11. an analog cell unit; 12. a main power supply unit; 13. simulating a discharge unit; 14. a simulated charging unit; 15. a first power supply terminal; 16. an identity authentication resistor; 17. a single chip microcomputer; 2. a battery protection plate; 111. a constant voltage source circuit. 112. A constant current source circuit; 113. a battery cell relay circuit; 114. a packet relay circuit; 115. a discharge relay circuit; 116. a charging relay circuit; 18. an authentication circuit; 3. and an upper computer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be further described in detail with reference to fig. 1 to 14 and the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
In a first aspect, as shown in fig. 1, there is provided a battery protection board testing machine 1, the battery protection board 2 including a protection board battery interface 21 and a protection board pack interface 22; for performing an activation test, a voltage calibration, a current calibration, a charge test and/or a discharge test on the battery protection plate 2; comprising the following steps: the device comprises an analog battery cell unit 11, a main power supply unit 12, an analog discharge unit 13, an analog charging unit 14, a first power supply end 15, an identity authentication resistor 16 and a singlechip 17;
the analog cell unit is connected with a protection board battery interface of the battery protection board and is used for providing an analog cell for the battery protection board when performing an activation test, a voltage calibration, a current calibration and/or a discharge test;
the main power supply unit is connected with a protection board package interface of the battery protection board and is used for respectively providing load voltage and charging voltage for the battery protection board during an activation test and a charging test;
the simulated discharge unit is connected with a protection board package interface of the battery protection board and is used for providing load current for the battery protection board during current calibration and discharge test;
the simulation charging unit is connected with a protection board battery interface of the battery protection board and is used for simulating the current of the battery core during the charging test.
Preferably, the method comprises the steps of,
as shown in fig. 2, the analog cell unit 11 includes: a constant voltage source circuit 111 and a battery cell relay circuit 113; the constant voltage source circuit is connected with a protection board battery interface of the battery protection board through a battery cell relay circuit;
as shown in fig. 3, the total power supply unit 12 includes: a constant voltage source circuit 111 and a packet relay circuit 114; the constant voltage source circuit is also connected with a protection board package interface of the battery protection board through a package relay circuit;
as shown in fig. 4, the analog discharge unit 13 includes: a constant current source circuit 112 and a discharge relay circuit 115; the constant current source circuit is connected with a protection board package interface of the battery protection board through the discharge relay circuit;
as shown in fig. 5, the analog charging unit 14 includes: a constant current source circuit 112 and a charging relay circuit 116; the constant current source is also connected with a protection board battery interface of the battery protection board through a charging relay circuit.
Preferably, the method comprises the steps of,
as shown in fig. 6, the constant voltage source circuit 111 includes:
the first sampling resistor R1111 is used for sampling and obtaining the output voltage of the first power supply end VCC1 and is used as the first output voltage of the constant voltage source circuit; one end of the first sampling resistor R1 is connected with one end of the first power supply end VCC1, and the other end of the first sampling resistor R1 is connected with the input end of the protection unit;
a first differential proportional amplifier 1112 for amplifying the first output voltage of the first sampling resistor R1 proportionally; the input end of the first differential proportional amplifier is connected with two ends of the first sampling resistor R1 in a bridging mode, and the output voltage of the first differential proportional amplifier is used as the first input of the first integral proportional amplifier;
first integrating proportional amplifier 1113 for outputting reference voltage V ref Comparing the output voltage of the first differential proportional amplifier with the output voltage of the first differential proportional amplifier, and outputting an input signal for controlling the first amplifying unit; the second input end of the first integrating proportional amplifier is connected with a reference voltage source, and the output end of the first integrating proportional amplifier is connected with the input end of the first amplifying unit;
a first amplifying unit 1114 for amplifying an output voltage of the first integrating proportional amplifier such that a magnitude of a current flowing through the first variable resistance unit is changed; the first amplifying unit is connected with the first variable resistance unit and the first integrating proportional amplifier;
a first variable resistance unit 1115 for changing resistance under joint control of the first amplifying unit and the first control unit; one end of the first variable resistor unit is connected with the positive end of the power supply, the other end of the first variable resistor unit is connected with one end of the first sampling resistor R1, and the third end of the first variable resistor unit is connected with the output end of the first amplifying unit;
a first control unit 1116 for controlling a voltage of a third terminal of the first variable resistance unit; one end of the first control unit is connected with the first amplifying unit, and the other end of the first control unit is connected with the third end of the first variable resistance unit;
a protection unit 1117, configured to shunt the current obtained by the first sampling resistor R1 when the current obtained by the first sampling resistor R1 exceeds a preset threshold; one end of the protection unit is connected with one end of the first sampling resistor R1, and the other end of the protection unit is connected with the third end of the first variable resistor unit.
Working principle: in the initial stage, the first power supply terminal VCC1 is turned on to supply power, the first variable resistance unit is in an on state, the first sampling resistor R and the first variable resistance unit share the voltage of the first power supply terminal VCC1, that is, when the resistance of the first variable resistance unit increases, the voltage shared across the first variable resistance unit is greater, if the resistance of the first variable resistance unit decreases,the voltage shared across the first variable resistance unit is less. After the voltage value obtained by sampling the first sampling resistor R is subjected to proportional adjustment by the differential proportional amplifier U1B, the output end FB obtains a required voltage value; then the voltage outputted by the output terminal FB and the reference voltage V ref Comparing, namely inputting the first input end of the first integrating proportional amplifier U1A to a non-inverting input end and an inverting input end; when the voltage outputted by the output terminal FB is equal to the reference voltage V ref After the comparison, if there is a difference, the output voltage of the first integrating proportional amplifier U1A will not be zero. When the output voltage of the output terminal FB is equal to the reference voltage V ref Equal, the output voltage of the first integrating proportional amplifier U1A is zero. The differential proportional amplifier U1B and the first integral proportional amplifier U1A are operational amplifiers. When the output voltage of the first integrating proportional amplifier U1A is not zero and is amplified by the first amplifying unit, the output voltage of the first amplifying unit is increased, the grid voltage of the first variable resistance unit is changed, and the voltage between the drain electrode and the source electrode of the first variable resistance unit is also changed; the voltage between the drain and the source of the first variable resistance unit changes, which also results in a change in the acquired voltage of the first sampling resistor R. The resistance value of the first sampling resistor R is unchanged, and thus, the current flowing through the first sampling resistor R changes. Similarly, in the case where the resistance value of the first variable resistance unit is unchanged, the value of the current flowing through the first sampling resistor R is also unchanged. In the case where the protection unit is present, if the current flowing through the first sampling resistor R is excessively large, the current flowing through the resistor R5 also becomes large, and the voltage across the resistor R5 also becomes large. The output current of the second differential proportional amplifier also becomes large; when the output current of the second differential proportional amplifier is different from the preset current threshold, the output voltage of the second integral proportional amplifier also changes, so that the output voltage of the second amplifying unit changes, and similarly, the voltage between the drain electrode and the source electrode of the first variable resistor unit changes, so that the current flowing through the first sampling resistor R changes. In this way, the protection unit has the function of preventing the output voltage of the constant voltage source circuit from being excessively large.
The first variable resistor unit is provided with two N-channel field effect transistors, and has the function of sharing current when the same current flows. When the same current flows through the first variable resistance unit, the current value born by each N-channel field effect transistor is smaller, and the situation that the N-channel field effect transistor is overlarge in current and generates heat can not occur.
Preferably, the method comprises the steps of,
as shown in fig. 7, the constant current source circuit 112 includes:
the second sampling resistor R1121 is used for sampling and obtaining the output voltage of the first power supply end VCC1 and outputting the current of the constant current source circuit; the second sampling resistor R2 is connected between the positive end VCC1+ and the negative end VCC 1-of the first power end VCC1 in a bridging way;
a second differential proportional amplifier 1122 for amplifying the first voltage outputted from the second sampling resistor R2 in proportion; the input end of the second differential proportional amplifier is connected with the two ends of the second sampling resistor R2 in a bridging way, and the output voltage of the second differential proportional amplifier is used as the first input of the second integral proportional amplifier;
a second integrating proportional amplifier 1123 for outputting a reference voltage V ref Comparing the output voltage of the second differential proportional amplifier with the output voltage of the second differential proportional amplifier, and outputting an input signal for controlling the second amplifying unit; the second input end of the second integrating proportional amplifier is connected with a reference current source, and the output end of the second integrating proportional amplifier is connected with the input end of the second amplifying unit;
a second amplifying unit 1124 for amplifying the output voltage of the second integrating proportional amplifier so that the magnitude of the current flowing through the second variable resistance unit is changed; the second amplifying unit is connected with the second variable resistance unit and the second integrating proportional amplifier;
a second variable resistance unit 1125 for changing resistance under joint control of the second amplifying unit and the second control unit; one end of the second variable resistance unit is connected with the positive end of the first power supply end VCC1, the other end of the second variable resistance unit is connected with one end of the second sampling resistor R2, and the third end of the second variable resistance unit is connected with the output end of the second amplifying unit;
a second control unit 1126 for controlling a voltage of a third terminal of the second variable resistance unit; one end of the second control unit is connected with the second amplifying unit, and the other end of the second control unit is connected with the third end of the second variable resistance unit;
a first protection unit 11213 and a second protection unit 11214;
the first protection unit includes: a second PNP transistor Q5 and a fifth resistor R5; the collector of the second PNP triode Q5 is connected with the ground end GND, the base is connected with the second power supply end VCC2 through a fifth resistor R5, and the emitter is connected with one end of the second sampling resistor R1121;
the second protection unit includes: a third PNP transistor Q6 and a sixth resistor R6; the emitter of the third PNP triode Q6 is connected with the ground end GND, the collector is connected with the other end of the second sampling resistor R1121, and the base is connected with a second power supply end VCC2 through a sixth resistor; the voltage of the first power supply terminal VCC1 is higher than the voltage of the second power supply terminal VCC 2.
Working principle: in the initial stage, when the first power supply end VCC1 is conducted, the second variable resistance unit is also in a conducting state and is divided by the sampling resistor R; in the second variable resistor unit, the resistance value changes in different time periods, so that the partial voltage of the second sampling resistor R also changes, and meanwhile, the current at the output end of the output constant current source circuit also changes. The second differential proportional amplifier takes the first voltage of the second sampling resistor R as input, and outputs a second voltage according to the proportion of the second differential proportional amplifier; the second voltage is equal to V ref As input to a second integrating proportional amplifier which combines a second voltage with V ref Comparing the second voltage with V ref The difference is larger, and the output voltage of the second integrating proportional amplifier is larger; v (V) ref And a set value from the MCU. If the second voltage is equal to V ref The difference is smaller, and the output voltage of the second integral proportional amplifier is smaller; the second amplifying unit amplifies the voltage of the output of the second integrating proportional amplifier and is used for controlling the variable resistance change range of the second variable resistance unit; obviously, the change of the resistance value of the variable resistor of the second variable resistance unit can cause the firstA change in the partial voltage across the two sampling resistors R; the voltage output by the second differential proportional amplifier changes due to the voltage division of the second sampling resistor R, and the change of the resistance value of the variable resistor of the second variable resistor unit is affected. In this embodiment, the second variable resistance unit adopts an N-channel field effect transistor Q3, because the output of the second amplifying unit is connected to the gate of the N-channel field effect transistor Q3; the voltage of the grid electrode changes to enable the N-channel field effect transistor Q3 in a conducting state to be in a variable resistance area, and finally, the voltage division value of the N-channel field effect transistor Q3 is controlled. The second control unit also controls the on-voltage of the second variable resistance unit. It can be seen that in the technical scheme of the utility model, if the second voltage and V occur ref Is large, the second voltage and V can be controlled ref The difference between the voltage and V is reduced to finally reach the second voltage ref The difference is minimal until equal. The stable voltage output can also lead to the stable output current of the final constant current source circuit, thereby achieving the purpose of the constant current source.
Preferably, the method comprises the steps of,
the analog cell unit further comprises: a voltage divider circuit and an analog cell interface component;
the analog charging unit further includes: a voltage divider circuit and an analog cell interface component;
the constant voltage source circuit is also connected with the voltage dividing circuit and the analog cell interface component through a battery cell relay circuit;
the constant current source circuit is also connected with the voltage dividing circuit and the analog cell interface component through a charging relay circuit respectively;
the analog battery cell unit and the analog charging unit are connected with the battery interface of the protection board through the analog battery cell interface component;
the voltage dividing circuit is used for providing divided voltage for the battery protection board, and comprises: four voltage dividing resistors connected in series in sequence;
the analog cell interface component comprises: five interface terminals;
a total of five terminals of the four voltage dividing resistors connected in series are respectively connected with five interface terminals of the analog cell interface component;
preferably, the method comprises the steps of,
as shown in fig. 8, further includes an authentication circuit 18;
the authentication circuit 18 is configured to authenticate whether the battery protection board belongs to a battery protection board model that can be tested by the testing machine, and includes: a first resistor 181, a second resistor 182 and a third resistor 183 connected in series in sequence; and an authentication voltage acquisition terminal led out at the junction of the second resistor 182 and the third resistor 183; a short circuit unit 184 disposed at both ends of the first resistor 181 for controlling whether to short-circuit the first resistor; the third resistor is also connected to ground GND via an identity authentication resistor 16.
Working principle: when the MCU sends a control signal IDCTRL to the short-circuit unit, the short-circuit unit is in a short-circuit state, and then part of the voltage dividing resistor is short-circuited. That is, when IDCTRL is at high level, the NPN triode is turned on, so that the N-channel field effect transistor NMOS is also in the on state, so that the resistance of the N-channel field effect transistor NMOS in the on state is far smaller than the resistance of a part of the voltage dividing resistor, which can be equivalently that the part of the voltage dividing resistor is shorted. Meanwhile, the MCU can acquire signals by using the voltage acquisition terminal IDAD for calculating whether the resistance value of the identity authentication resistor at the moment accords with the resistance value authenticated by the MCU, and if the resistance value of the identity authentication resistor at the moment is equal to the resistance value authenticated by the MCU, the identity of the battery protection board can be considered to be correct instead of the battery protection boards of other brands or models.
In a second aspect, as shown in fig. 9, there is further provided an activation test method using the battery protection board tester according to any one of the above technical solutions, for testing whether a battery protection board can be activated, including:
s101: the constant voltage source circuit of the battery protection board tester provides an analog cell for the battery protection board through the battery cell relay circuit;
s102: connecting a relay circuit of the battery protection board tester with a protection board package interface of the battery protection board;
s103: and when the voltage input is detected by the protection plate package interface of the battery protection plate, opening the field effect tube of the battery protection plate, so as to activate the battery protection plate.
In a third aspect, as shown in fig. 10, there is also provided a voltage calibration method using the battery protection board tester according to any one of the above-mentioned technical aspects,
s201: the constant voltage source circuit of the battery protection board tester provides an analog cell for the battery protection board through the battery cell relay circuit;
s202: connecting a relay circuit of the battery protection board tester with a protection board package interface of the battery protection board;
s203: and voltage calibration is realized by utilizing the singlechip of the battery protection board testing machine and the communication chip on the battery protection board and through the communication protocol of the singlechip and the calibration protocol of the communication chip.
In a fourth aspect, as shown in fig. 11, there is also provided a current calibration method using the battery protection plate tester according to any one of the above-mentioned technical aspects,
s301: the constant voltage source circuit of the battery protection board tester provides an analog cell for the battery protection board through the battery cell relay circuit;
s302: the constant current source circuit of the battery protection board tester is connected with the protection board package interface of the battery protection board through the discharge relay circuit;
s303: the current of the constant current source passes through the field effect tube of the battery protection board;
s304: and the current calibration is realized by utilizing the singlechip of the battery protection board testing machine and the communication chip on the battery protection board and through the communication protocol of the singlechip and the calibration protocol of the communication chip.
In a fifth aspect, as shown in fig. 12, there is also provided a charge test method using the battery protection plate tester according to any one of the above-mentioned technical aspects,
s401: the constant voltage source circuit of the battery protection board tester outputs preset voltage through the relay circuit;
s402: the constant current source circuit of the battery protection board tester outputs preset current through the charging relay circuit;
s403: the current of the constant current source passes through the field effect tube of the battery protection board;
s404: the method comprises the steps of utilizing a singlechip of the battery protection board testing machine and a coulomb meter chip on a battery protection board to read the current of the coulomb meter chip on the battery protection board and comparing the current value output by a constant current source through a communication protocol of the singlechip, and testing whether the battery protection board is in a charging state or not; when the current of the coulometer chip is positive, the coulometer chip is in a charged state.
In a sixth aspect, as shown in fig. 13, there is also provided a discharge test method using the battery protection plate tester according to any one of the above-mentioned technical aspects,
s501: the constant voltage source circuit of the battery protection board tester outputs preset voltage through the relay circuit;
s502: the constant current source circuit of the battery protection board tester outputs preset current through the discharge relay circuit;
s503: the current of the constant current source passes through the field effect tube of the battery protection board;
s504: the method comprises the steps of utilizing a singlechip of the battery protection board testing machine and a coulomb meter chip on a battery protection board to read the current of the coulomb meter chip on the battery protection board and comparing the current value output by a constant current source through a communication protocol of the singlechip, and testing whether the battery protection board is in a discharge state or not; when the current of the coulometer chip is negative, the coulometer chip is in a discharge state.
In a seventh aspect, as shown in fig. 14, there is further provided a battery protection board testing system, including a battery protection board testing machine according to any one of the above-mentioned technical solutions; the battery protection board also comprises an upper computer 3 and a battery protection board 2;
the upper computer 3 is connected with the battery protection board testing machine 1 and is used for communicating with the battery protection board testing machine 1 and downloading data;
the battery protection plate 2 further includes: a protective board communication interface; and the upper computer writes working data into the battery protection board through the communication interface.
In summary, the present utility model includes at least one of the following beneficial technical effects:
the utility model realizes the automatic test of various performances of the battery protection board, improves the test efficiency of the battery protection board, and can avoid the difference between factory parameters and set parameters which are easy to cause in manual step-by-step test.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the scope of the utility model in any way, including the abstract and drawings, in which case any feature disclosed in this specification (including abstract and drawings) may be replaced by alternative features serving the same, equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Claims (8)
1. A battery protection board testing machine is characterized in that: the method is used for performing activation test, voltage calibration, current calibration, charge test and discharge test on the battery protection plate;
the device comprises an analog battery cell unit, a main power supply unit, an analog discharging unit and an analog charging unit;
the analog cell unit is connected with the battery protection board and is used for providing an analog cell for the battery protection board when the activation test, the voltage calibration, the current calibration and the discharge test are carried out;
the main power supply unit is connected with the battery protection board and is used for respectively providing load voltage and charging voltage for the battery protection board when the activation test and the charging test are carried out;
the simulated discharge unit is connected with the battery protection board and is used for providing load current for the battery protection board when current calibration and discharge test are carried out;
the simulation charging unit is connected with the battery protection board and is used for simulating the current of the battery cell during the charging test.
2. The battery protection board tester of claim 1 wherein the analog cell unit comprises a constant voltage source circuit and a battery cell relay circuit; the analog charging unit comprises a constant current source circuit and a charging relay circuit;
when an activation test, a voltage calibration, a current calibration and a discharge test are carried out, the constant voltage source circuit is connected with a battery interface of the battery protection board through the battery core relay circuit.
3. The battery protection board tester of claim 2, wherein the analog cell unit and the analog charging unit further collectively comprise a resistor divider circuit and an analog cell interface circuit;
the resistor voltage dividing circuit is used for dividing the output voltage of the constant voltage source circuit;
the battery cell relay circuit and the charging relay circuit are connected with one end of the analog cell interface circuit, and the other end of the analog cell interface circuit is connected with the battery interface of the battery protection plate.
4. The battery protection board tester of claim 1, wherein the total power supply unit comprises: a constant voltage source circuit and a packet relay circuit; the analog discharge unit includes: a constant current source circuit and a discharge relay circuit;
when the charging test is carried out, the constant voltage source circuit is connected with the package interface of the battery protection board through the package relay circuit, and the constant current source circuit is connected with the package interface of the battery protection board through the charging relay circuit.
5. The battery protection board tester according to claim 2, wherein the constant voltage source circuit includes:
the first sampling resistor R1 is used for sampling and obtaining the output voltage of the first power supply end VCC1 and is used as the first output voltage of the constant voltage source circuit; one end of the first sampling resistor R1 is connected with one end of the first power supply end VCC1, and the other end of the first sampling resistor R1 is connected with the input end of the protection unit;
a first differential proportional amplifier for amplifying the first output voltage of the first sampling resistor R1 proportionally; the input end of the first differential proportional amplifier is connected with two ends of the first sampling resistor R1 in a bridging mode, and the output voltage of the first differential proportional amplifier is used as the first input of the first integral proportional amplifier;
a first integrating proportional amplifier for amplifying the reference voltage V ref Comparing the output voltage of the first differential proportional amplifier with the output voltage of the first differential proportional amplifier, and outputting an input signal for controlling the first amplifying unit; the second input end of the first integrating proportional amplifier is connected with a reference voltage source, and the output end of the first integrating proportional amplifier is connected with the input end of the first amplifying unit;
a first amplifying unit for amplifying an output voltage of the first integrating proportional amplifier so that a magnitude of a current flowing through the first variable resistance unit is changed; the first amplifying unit is connected with the first variable resistance unit and the first integrating proportional amplifier;
a first variable resistance unit for changing resistance under joint control of the first amplifying unit and the first control unit; one end of the first variable resistor unit is connected with the positive end of the power supply, the other end of the first variable resistor unit is connected with one end of the first sampling resistor R1, and the third end of the first variable resistor unit is connected with the output end of the first amplifying unit;
a first control unit for controlling a voltage of a third terminal of the first variable resistance unit; one end of the first control unit is connected with the first amplifying unit, and the other end of the first control unit is connected with the third end of the first variable resistance unit;
the protection unit is used for shunting the current acquired by the first sampling resistor R1 when the current acquired by the first sampling resistor R1 exceeds a preset threshold value; one end of the protection unit is connected with one end of the first sampling resistor R1, and the other end of the protection unit is connected with the third end of the first variable resistor unit.
6. The battery protection board tester according to claim 2, wherein the constant current source circuit includes:
the second sampling resistor R2 is used for sampling and obtaining the output voltage of the first power supply end VCC1 and outputting the current of the constant current source circuit; the second sampling resistor R2 is connected between the positive end VCC1+ and the negative end VCC 1-of the first power end VCC1 in a bridging way;
the second differential proportional amplifier is used for amplifying the first voltage output by the second sampling resistor R2 in proportion; the input end of the second differential proportional amplifier is connected with the two ends of the second sampling resistor R2 in a bridging way, and the output voltage of the second differential proportional amplifier is used as the first input of the second integral proportional amplifier;
a second integrating proportional amplifier for outputting a reference voltage V ref Comparing the output voltage of the second differential proportional amplifier with the output voltage of the second differential proportional amplifier, and outputting an input signal for controlling the second amplifying unit; the second input end of the second integrating proportional amplifier is connected with a reference current source, and the output end of the second integrating proportional amplifier is connected with the input end of the second amplifying unit;
a second amplifying unit for amplifying an output voltage of the second integrating proportional amplifier so that a magnitude of a current flowing through the second variable resistance unit is changed; the second amplifying unit is connected with the second variable resistance unit and the second integrating proportional amplifier;
a second variable resistance unit for changing resistance under joint control of the second amplifying unit and the second control unit; one end of the second variable resistance unit is connected with the positive end of the first power supply end VCC1, the other end of the second variable resistance unit is connected with one end of the second sampling resistor R2, and the third end of the second variable resistance unit is connected with the output end of the second amplifying unit;
a second control unit for controlling a voltage of a third terminal of the second variable resistance unit; one end of the second control unit is connected with the second amplifying unit, and the other end of the second control unit is connected with the third end of the second variable resistance unit.
7. The battery protection plate tester of claim 1, further comprising an authentication circuit;
the authentication circuit is used for authenticating whether the battery protection board belongs to the battery protection board model which can be tested by the tester, and comprises: the first resistor, the second resistor and the third resistor are sequentially connected in series; the authentication voltage acquisition terminal is led out from the connection part of the second resistor and the third resistor; the short-circuit units are arranged at two ends of the first resistor and are used for controlling whether the first resistor is short-circuited; the third resistor is also connected to the ground GND through an identity authentication resistor.
8. A battery protection board testing system comprising the battery protection board tester according to any one of claims 1 to 7; the battery protection board also comprises an upper computer and a battery protection board;
the upper computer is connected with the battery protection board testing machine and is used for communicating with the battery protection board testing machine and downloading data;
the battery protection plate further includes: a protective board communication interface; and the upper computer writes working data into the battery protection board through the communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321954926.5U CN220188664U (en) | 2023-07-21 | 2023-07-21 | Battery protection board testing machine and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321954926.5U CN220188664U (en) | 2023-07-21 | 2023-07-21 | Battery protection board testing machine and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220188664U true CN220188664U (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321954926.5U Active CN220188664U (en) | 2023-07-21 | 2023-07-21 | Battery protection board testing machine and system |
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| Country | Link |
|---|---|
| CN (1) | CN220188664U (en) |
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2023
- 2023-07-21 CN CN202321954926.5U patent/CN220188664U/en active Active
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