CN114047443A - Analog battery and circuit board thereof, analog battery testing system and testing method thereof - Google Patents
Analog battery and circuit board thereof, analog battery testing system and testing method thereof Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 107
- 230000001105 regulatory effect Effects 0.000 claims abstract description 81
- 238000004088 simulation Methods 0.000 claims abstract description 27
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- 239000000758 substrate Substances 0.000 claims description 18
- 230000001965 increasing effect Effects 0.000 claims description 16
- 239000003990 capacitor Substances 0.000 claims description 12
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- 230000003750 conditioning effect Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 7
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 238000007600 charging Methods 0.000 description 3
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- 229910052744 lithium Inorganic materials 0.000 description 3
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- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 1
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- JEDYYFXHPAIBGR-UHFFFAOYSA-N butafenacil Chemical compound O=C1N(C)C(C(F)(F)F)=CC(=O)N1C1=CC=C(Cl)C(C(=O)OC(C)(C)C(=O)OCC=C)=C1 JEDYYFXHPAIBGR-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a simulation battery and a circuit board thereof, a simulation battery test system and a test method thereof, wherein the simulation battery comprises: the single-chain series voltage division circuit comprises a plurality of single-chain power supply regulating circuits which are connected in series, the single-chain power supply regulating circuits are used for generating single battery cell voltages through voltage regulating power supply simulation and providing passive balance current, and the single battery cell voltages generated by each single-chain power supply regulating circuit simulation are independently regulated; the current-limiting voltage storage circuit is connected in series with the initial end of the single-chain series voltage division circuit and is used for providing current-limiting protection for the single-chain series voltage division circuit during overcurrent and dividing the voltage of the single-chain series voltage division circuit during overvoltage; the current-limiting voltage-storing current is used for being connected with the anode of the direct-current power supply, and the tail end of the single-chain series voltage-dividing circuit is used for being connected with the cathode of the direct-current power supply. By implementing the invention, any single-string power supply regulating circuit can independently start passive equalization, and multi-path passive equalization test can be realized.
Description
Technical Field
The invention relates to the technical field of simulated batteries, in particular to a simulated battery and a circuit board thereof, a simulated battery test system and a test method thereof.
Background
In the field of lithium battery management systems, engineers generally use a resistor voltage division type analog battery circuit board in debugging and testing, the resistor voltage division type analog battery circuit board has simple functions, all strings of voltages are equal and fixed, but the resistor voltage division type analog battery circuit board can only be suitable for simple functional testing, and is insufficient for testing projects with relatively complex requirements. For example, multiple passive equalization starts, an unbalanced voltage test requiring setting more than three different voltage values, and the like. Even if one-path passive equalization test is carried out, the connecting wire needs to be adjusted temporarily, the connecting action is relatively complex, and two power supply devices are needed. Therefore, the resistance voltage division type simulation battery circuit board is complicated in connection, flexible in operation and functional, and is not suitable for being used as a conventional test project.
In order to complete complex test items, companies with abundant funds can directly purchase expensive simulated battery equipment, and the simulated battery equipment has rich functions, can meet all test items, and is relatively simple to operate. However, such devices are bulky, and need to be connected with a computer to perform various operations, and mobility and portability are poor, and for software and hardware tests, the devices are occupied for a long time, so that the utilization rate of the devices is low, conventional test items do not need the devices, and only complex tests need the devices, such as tests for simulating battery charging and discharging, and tests for simulating the gradual rise and fall of the voltage of a single battery cell.
Therefore, the function of the simulated battery circuit board is too simple, and some conventional test items have functional defects. For analog battery devices, although rich in functionality, they are bulky, poorly portable, inefficient, and expensive. The existing simulation battery system is difficult to meet the current test requirement.
Disclosure of Invention
The invention provides a simulation battery, a circuit board thereof, a simulation battery test system and a test method thereof, and aims to solve the problems that the conventional simulation battery circuit board is only suitable for simple function test and is difficult to realize multi-path passive equilibrium test.
In a first aspect, the present invention provides an analog battery comprising: the single-chain series voltage division circuit comprises a plurality of single-chain power supply regulating circuits which are connected in series, the single-chain series voltage division circuit is used for simulating and generating the voltage of a single battery cell through a voltage regulating power supply and providing passive balanced current, and the voltage of the single battery cell generated by each single-chain power supply regulating circuit is independently regulated; the current-limiting voltage storage circuit is connected to the initial end of the single-chain series voltage division circuit in series and used for providing current-limiting protection for the single-chain series voltage division circuit during overcurrent and dividing the voltage of the single-chain series voltage division circuit during overvoltage; the current-limiting voltage-storing current is used for being connected with the anode of a direct-current power supply, and the tail end of the single-chain series voltage-dividing circuit is used for being connected with the cathode of the direct-current power supply.
Furthermore, the current-limiting voltage storage circuit comprises a first triode, a first controllable precise voltage-stabilizing source, a base resistor and a first current-limiting resistor, wherein one end of the base resistor is used for being connected with the positive electrode of the direct-current power supply, the other end of the base resistor is connected with the cathode of the first controllable precise voltage-stabilizing source, the collector of the first triode is connected with one end of the base resistor, the base of the first triode is connected with the other end of the base resistor and the cathode of the first controllable precise voltage-stabilizing source, the emitter of the first triode is connected with one end of the first current-limiting resistor, the reference electrode of the first controllable precise voltage-stabilizing source is connected with the emitter of the first triode and one end of the first current-limiting resistor, and the anode of the first controllable precise voltage-stabilizing source is connected with the other end of the first current-limiting resistor.
Furthermore, the single-string power supply regulating circuit comprises a second controllable precise voltage-stabilizing source, a regulating potentiometer, a second current-limiting resistor, a voltage-stabilizing diode, a first resistor and a second resistor, wherein the voltage-stabilizing diode is connected in series in the single-chain series voltage-dividing circuit, the anode of the second controllable precise voltage-stabilizing source is connected with the anode of the voltage-stabilizing diode, the cathode of the second controllable precise voltage-stabilizing source is connected with the cathode of the voltage-stabilizing diode through the second current-limiting resistor, the first resistor and the second resistor are connected in series between the cathode and the anode of the second controllable compact voltage-stabilizing source, the reference electrode of the second controllable compact voltage-stabilizing source is connected between the first resistor and the second resistor, and the regulating potentiometer is connected with the first resistor in parallel.
Further, the single-string power supply regulating circuit further comprises: the accelerating capacitor is connected between the cathode of the second controllable compact voltage-stabilizing source and the reference electrode; or, the single-string power supply regulating circuit further comprises a filter capacitor, and the filter capacitor is connected between the cathode and the anode of the second controllable compact voltage-stabilizing source.
In a second aspect, the present invention further provides a simulated battery circuit board, which includes a substrate and a simulated battery, where the simulated battery is the simulated battery of the first aspect, and the simulated battery is integrated on the substrate.
Further, the substrate further comprises: at least one of a voltage acquisition interface circuit, an acquisition line switch circuit, a current acquisition interface circuit and a temperature acquisition interface circuit; the voltage acquisition interface circuit is connected with the single-string power supply adjusting circuit and is connected with an external acquisition line through a connecting terminal; the current acquisition interface circuit comprises a reference voltage unit, a sampling resistor and a precision resistor, wherein the reference voltage unit is connected with one end of the sampling resistor, the other end of the sampling resistor is connected with the precision resistor, the precision resistor is grounded, a sampling point is formed between the sampling resistor and the precision resistor, and the sampling point is connected with the single-string power supply regulating circuit; the temperature acquisition interface circuit comprises a winding potentiometer, the winding potentiometer is connected with the single-string power supply adjusting circuit, and the winding potentiometer is used for simulating the resistance value of the thermistor to change; the acquisition line switch circuit comprises a dial switch, wherein one end of the dial switch is connected with the single-string power supply adjusting circuit, the other end of the dial switch is connected with the connecting terminal, and the dial switch is used for closing or disconnecting an external acquisition line.
Further, the substrate further comprises: the direct-current power supply interface circuit comprises a positive end, a negative end and an indicator light, wherein the positive end is connected with the current-limiting voltage-storing circuit, the negative end is connected with the tail end of the single-chain series voltage-dividing circuit, one end of the indicator light is used for connecting the positive electrode of the direct-current power supply, and the other end of the indicator light is grounded; and/or a serial number selection port circuit which is connected with the current-limiting voltage storage circuit and the single-serial power supply regulating circuit and is used for selecting the serial number of the single-serial power supply regulating circuit connected in series in the single-chain serial voltage dividing circuit.
In a third aspect, the present invention further provides a simulated battery testing system, which includes a simulated battery circuit board, a dc power supply and a battery management module, where the simulated battery circuit board is the simulated battery circuit board described in the second aspect, the dc power supply is connected to the simulated battery circuit board and the battery management module, and the simulated battery circuit board is connected to the battery management module.
In a fourth aspect, the present invention further provides a testing method of a simulated battery testing system, where the simulated battery testing system is the simulated battery testing system of the third aspect, and the testing method includes: respectively connecting the positive pole and the negative pole of a direct current power supply to the positive pole and the negative pole of a direct current power supply interface circuit; selecting the string number of the single-string power supply regulating circuit through the string number selection port circuit; adjusting the output voltage of the direct current power supply to a preset total voltage value; adjusting an adjusting potentiometer in the single-string power supply adjusting circuit to enable the reference voltage of a second controllable precise voltage-stabilizing source to reach a preset reference voltage value and enable the voltage of the single-string power supply adjusting circuit to reach a preset monomer voltage value; adjusting the output voltage of the direct current power supply to enable the output current of the direct current power supply to be within a preset current range; and connecting the battery management module to the simulation battery circuit board for testing.
Further, the accessing the battery management module to the simulated battery circuit board for testing includes: at least one of an overvoltage test step, a passive balance test step and a high-low temperature charge-discharge test step; and (3) overvoltage testing: according to the overvoltage protection voltage value preset in the battery management module, the voltage in the single-string power supply regulating circuit is adjusted to be high or low by using the regulating potentiometer; passive equalization testing step: the output voltage of the direct-current power supply is increased and the voltage of the single-string power supply regulating circuit is increased, so that the single-string power supply regulating circuit reaches a passive balance condition; high and low temperature charge and discharge testing: and connecting the other direct current power supply to the analog battery circuit board and keeping constant current output, and increasing or decreasing the temperature in the single-string power supply regulating circuit by using the winding potentiometer according to the preset high-temperature discharge protection temperature value in the battery management module.
Compared with the prior art, the invention has the beneficial effects that: the single-chain series voltage division circuit comprises a plurality of single-string power supply adjusting circuits which are mutually connected in series, the single-string power supply adjusting circuits are equivalent to single battery cells in a battery pack, the single-string power supply adjusting circuits generate the voltage of the single battery cells by utilizing voltage-regulating power supply simulation, namely, each single-string power supply adjusting circuit is a power supply with adjustable voltage; meanwhile, the current-limiting voltage storage circuit is used for providing current-limiting protection for the single-string power supply regulating circuit, redundant voltage can be shared for the single-string power supply regulating circuit when the DC power supply applies overhigh voltage, the voltage in the single-string power supply regulating circuit cannot be influenced, therefore, the voltage of each single-string power supply regulating circuit can be independently regulated, passive equalization can be independently started for any single-string power supply regulating circuit, multi-path passive equalization test can be realized, and the circuit is simple and flexible to operate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 shows a circuit diagram of a simulated battery according to an embodiment of the invention;
FIG. 2 is a circuit diagram of a current-limiting voltage storage circuit of a simulated battery according to an embodiment of the invention;
FIG. 3 shows a circuit diagram of a single string power conditioning circuit for a simulated battery according to an embodiment of the invention;
FIG. 4 shows a schematic structural diagram of a simulated battery circuit board according to an embodiment of the invention;
FIG. 5 shows a circuit diagram of a simulated battery circuit board according to an embodiment of the invention;
FIG. 6 is a schematic diagram of a DC power interface circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a string number selection port circuit according to an embodiment of the present invention;
FIG. 8 shows a schematic diagram of a gather line switch circuit according to an embodiment of the invention;
FIG. 9 shows a schematic diagram of a voltage acquisition circuit according to an embodiment of the invention;
FIG. 10 shows a schematic diagram of a current acquisition circuit according to an embodiment of the present invention;
FIG. 11 shows a schematic diagram of a temperature acquisition circuit according to an embodiment of the present invention;
FIG. 12 is a flow chart of a testing method of a simulation battery testing system according to an embodiment of the present invention;
FIG. 13 is a schematic diagram of another exemplary embodiment of a simulated battery circuit board;
100. simulating a battery; 10. a current-limiting voltage storage circuit; 20. a single-chain series voltage divider circuit; 21. a single-string power supply regulation circuit; 30. a DC power supply interface circuit; 40. a serial number selection port circuit; 50. a collection line switch circuit; 60. a voltage acquisition interface circuit; 70. a current collection interface circuit; 80. a temperature acquisition interface circuit;
150. simulating a battery circuit board;
200. a direct current power supply;
300. and a battery management module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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 invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides an analog battery 100, including: the single-chain series voltage division circuit 20 comprises a plurality of single-chain series power supply regulating circuits 21 which are mutually connected in series, the single-chain series voltage division circuit 21 is used for simulating and generating single cell voltages of the batteries through a voltage regulating power supply and providing passive balanced current, and the single cell voltages of the batteries simulated and generated by each single-chain series power supply regulating circuit 21 are independently regulated; the current-limiting voltage storage circuit 10 is connected in series at the beginning of the single-chain series voltage division circuit 20, and the current-limiting voltage storage circuit 10 is used for providing current-limiting protection for the single-chain series voltage division circuit 20 during overcurrent and dividing the voltage of the single-chain series voltage division circuit 20 during overvoltage; the current-limiting voltage-storing current is used for connecting the positive electrode of the dc power supply 200, and the end of the single-chain series voltage-dividing circuit 20 is used for connecting the negative electrode of the dc power supply 200.
Specifically, the analog battery 100 is supplied with power by the dc power supply 200, and the current-limiting voltage-storing circuit 10 is connected in series to the beginning of the single-chain series voltage-dividing circuit 20, so that the positive electrode of the dc power supply 200 is connected to the current-limiting voltage-storing circuit 10, and the negative electrode of the dc power supply 200 is connected to the end of the single-chain series voltage-dividing circuit 20, where the end of the single-chain series voltage-dividing circuit 20 refers to the last single-chain power-supply regulating circuit 21 connected in series. The total voltage output to the single-chain series voltage division circuit 20 and the current-limiting voltage storage circuit 10 by the direct-current power supply 200 is adjusted to change the total current in the series circuit, so that the total current of the circuit meets the current requirement of balanced opening, and the unbalance of the single voltage caused by the fact that the total current cannot meet the requirement of balanced current after balanced opening is avoided. This way of realistic passive equalization enables the analog battery 100 to test the implementation of multiple passive equalization functions. Moreover, when the analog battery 100 of the embodiment does not need the balancing function, the total voltage can be reduced to reduce the total current in the circuit, and the operation of the analog battery 100 can be maintained only by 1-2mA at minimum, so that the power consumption is very small, and the size is also very small. Compared with the existing analog battery 100 system, the general analog battery 100 system does not need to increase the current to a certain threshold value to use the equalizing function, and the idea is to output a sufficiently large current in real time according to the requirement of the equalizing current, but the power supply system of the analog battery 100 needs to be sufficiently complex, and the system size is larger. Therefore, the embodiment of the invention has simple circuit and small volume under the condition of realizing multi-path passive equalization.
Through the implementation of the embodiment, a single-chain series voltage division circuit 20 and a current-limiting voltage storage circuit 10 are arranged to form an analog battery 100 and are supplied with power by a direct-current power supply 200, the single-chain series voltage division circuit 20 comprises a plurality of single-string power supply adjusting circuits 21 which are mutually connected in series, the single-string power supply adjusting circuits 21 are equivalent to single battery cells in a battery pack, the single-string power supply adjusting circuits 21 utilize voltage-regulating power supplies to generate the voltage of the single battery cells, namely, each single-string power supply adjusting circuit 21 is a power supply with adjustable voltage; meanwhile, the current-limiting voltage storage circuit 10 is used for providing current-limiting protection for the single-string power supply regulating circuit 21, redundant voltage can be shared by the single-string power supply regulating circuit 21 when the DC power supply 200 applies overhigh voltage, and the voltage in the single-string power supply regulating circuit 21 cannot be influenced, so that the voltage of each single-string power supply regulating circuit 21 can be independently regulated, passive equalization can be independently started for any single-string power supply regulating circuit 21, multi-path passive equalization test can be realized, and the circuit is simple and flexible to operate.
In one embodiment, referring to fig. 2, the current-limiting voltage storage circuit 10 includes a first transistor Q13, a first controllable precision regulator U13, a base resistor (R118, R119), and a first current-limiting resistor R38, one end of the base resistor (R118, R119) is used to connect with the positive electrode of the dc power supply 200, the other end of the base resistor (R118, R119) is connected with the cathode of the first controllable precision regulator U13, the collector of the first transistor Q13 is connected with one end of the base resistor (R118, R119), the base of the first transistor Q13 is connected with the other end of the base resistor (R118, R119) and the cathode of the first controllable precision regulator U13, the emitter of the first transistor Q13 is connected with one end of the first current-limiting resistor R38, the reference electrode of the first controllable precision regulator U13 is connected with the emitter of the first transistor Q13 and the first current-limiting resistor R38, and the anode of the first controllable precise voltage regulator U13 is connected with the other end of the first current limiting resistor R38. The base resistance in this embodiment includes R118 and R119,
as shown in fig. 2, fig. 2 is a current limiting voltage storage circuit 10. Which is located at the B + connection terminal, F1 is a fuse for overcurrent protection. The first transistor Q13 is a single-stage amplifying transistor, and adjusts the voltage and current of the collector and emitter of the first transistor Q13 by adjusting the voltage applied between the B + and B-terminals by the dc power supply 200. Specifically, when the voltage applied by the dc power supply 200 is much greater than the total voltage required by the single-string power conditioning circuit 21, the voltage across the base resistors (R118, R119) increases, the base current of the first transistor Q13 also increases, and the collector and emitter currents of the first transistor Q13 are amplified, so that the excess voltage is shared between the collector and emitter of the first transistor Q13, thereby achieving the voltage division function. If the current at the collector of the first transistor Q13 is slightly larger than the passive equalization current, for example, a few milliamperes larger, then the analog battery 100 may be subjected to the passive equalization test. When the voltage applied by the dc power supply 200 is slightly greater than the total voltage required by the single-string power supply circuit, the voltage shared by the first transistor Q13 decreases, the base current of the first transistor Q13 also decreases, and the collector and emitter currents of the first transistor Q13 decrease with the decrease, so that the power consumption of the analog battery 100 decreases. The analog battery 100 system can be used for other test items besides the passive equalization function, and power consumption is greatly reduced.
The first controllable precise voltage regulator source U13 and the first current limiting resistor R38 jointly realize a current limiting function, and the voltage limiting characteristic of the first controllable precise voltage regulator source U13 is utilized to enable the voltage limiting characteristic of 2.5V between a reference electrode (R end) and an anode (A end) of the first controllable precise voltage regulator source U13 to limit the current flowing through the first current limiting resistor R38. Because the voltage between the reference electrode and the anode of the first controllable precise voltage-stabilizing source U13 is fixed to be 2.5V, and the resistance value of the current-limiting resistor is also fixed, the current flowing through the first current-limiting resistor R38 can be limited, and the current-limiting effect is realized.
It should be noted that the first controllable precision voltage regulator U13 in this embodiment is TL431 or TL 432. TL431 is suitable for testing requirements of output voltage of 2.5V to 5.0V, TL432 is suitable for testing requirements of output voltage of 1.25V to 2.5V, and TL431 or TL432 can be selected and applied according to different lithium battery types or testing single voltage requirements. When the voltage applied by the dc power supply 200 is less than the total voltage required by the single-string power supply circuit, the voltage of the single-string power supply regulating circuit 21 will be squeezed and reduced, the reference voltage of the R terminal and the a terminal of the TL431 or the TL432 is less than 2.48V, and is not fully turned on, so that the output voltage becomes small and unstable, and the whole analog battery 100 system is in a voltage unsaturated working state. When the voltage between the R end and the A end of the first controllable precise voltage-stabilizing source U13 reaches more than 2.48V, the TL431 is in a fully-opened state, the internal resistance is minimum, the overcurrent capacity is strongest, and the TL431 can pass 100mA current nominally. Therefore, when the analog battery 100 is debugged, the voltage value of each single-string power supply regulating circuit 21 needs to be checked, which is a precondition for ensuring that the analog battery 100 can normally operate, and therefore, test points can be added in practical application.
In summary, if the analog battery 100 is allowed to operate normally, the supply voltage of the dc power supply 200 is several volts higher than the total voltage required by the single-string power circuit in the energy-saving state. When testing passive equalization, the dc power supply 200 supplies a current to the analog battery 100 that is several milliamperes greater than the passive equalization current (which needs to be achieved by increasing the voltage of the dc power supply 200). In a word, the adjustment mode of the analog battery 100 is to adjust the power supply voltage of the dc power supply 200, and the appropriate voltage of the dc power supply 200 can not only make the analog battery 100 system work better, but also reduce the power consumption of the system.
In one embodiment, referring to fig. 3, the single-string power conditioning circuit 21 includes a second controllable precision regulator (U11, U13), a conditioning potentiometer (R36, R37), a second current limiting resistor (R112, R113), a zener diode (D11, D12), a first resistor (R22, R24) and a second resistor (R23, R25), the zener diode (D11, D12) is connected in series in the single-chain series voltage divider circuit 20, an anode of the second controllable precision regulator (U11, U13) is connected to an anode of the zener diode (D11, D12), a cathode of the second controllable precision regulator (U11, U13) is connected to a cathode of the zener diode (D11, D12) through the second current limiting resistor (R112, R113), the first resistor (R22, R24) and the second current limiting resistor (R25, R23) are connected in series between the anode of the second controllable precision regulator (D3683, R23), the reference pole of the second controllable compact stabilized voltage source is connected between the first resistor (R22, R24) and the second resistor (R23, R25), and the adjusting potentiometer (R36, R37) is connected with the first resistor (R22, R24) in parallel.
Fig. 3 is a two-way series single string power conditioning circuit 21. Which is located near the B-connection terminal and corresponds to the single string power supply regulation circuits 211 and 2 in fig. 1. The second current limiting resistors (R112, R113) are series resistors at the input end of the single-string power supply regulating circuit 21, and are used for current limiting protection. The voltage stabilizing diodes (D11, D12) are input voltage stabilizing tubes of the power supply and are used for stabilizing the input voltage of the power supply. The second controllable precise voltage-stabilizing source (U11, U13) (U11 and U12) is TL431 reference voltage chip, which is the core IC of the whole single-string power circuit and can change the output voltage value by adjusting the voltage-dividing resistance value of the output end to achieveAnd (5) regulating the voltage. The first resistors (R22, R24) (R22 and R24) are balance resistors of the adjusting resistor part for balancing the resistance of the upper half part of the voltage dividing resistor. The second resistors (R23, R25) (R23 and R25) are the lower half resistors of the output voltage dividing resistors, which have fixed resistance values. Specifically, R36 and R37 are output-side adjustment potentiometers (R36, R37) for adjusting the value of the output voltage, the calculation formula of which is:
wherein, UoTo output a voltage, R25Since the resistance values of the second resistors (R23, R25) are fixed, the output voltage can be adjusted by adjusting the resistance values of the adjustment potentiometers (R36, R37). For example, increase R36，UoAnd also increases therewith; decrease R36，UoAnd also decreases. Therefore, the second controllable precise voltage-stabilizing sources (U11 and U13), the adjusting potentiometers (R36 and R37), the second current-limiting resistors (R112 and R113) and the second resistors (R23 and R25) form a voltage-regulating power supply, so that the voltage of the single-string power supply adjusting circuit 21 can be adjusted at will, and the voltage of a single battery cell is generated in a simulated mode. That is, each single cell formed by the TL431 is a voltage-adjustable power supply, and the analog battery 100 formed by connecting N TL431 circuits in series requires that the current passing through each TL431 circuit is the same, so that the output voltage of each TL431 circuit in the series circuit can be kept stable and adjustable, and the adjustment of the output voltage of one TL431 circuit does not affect the stability of the output voltages of other circuits. In addition, the series circuit formed by the N TL431 paths has a current limiting protection function, and when the total current of the series circuit reaches a set current limiting value, the current cannot be increased continuously. This effectively protects the safety of the analog battery 100, enhancing the reliability of the system; avoiding overheating of the TL431 and the power device due to excessive current. Therefore, the single-string power supply regulating circuit 21 of the embodiment can simulate and generate single-cell voltages of multiple strings of lithium batteries, each single-cell voltage string can independently regulate the voltage, the strings have no influence on each other when the voltage is regulated, single-section or multi-section passive equalization simulation can be performed, and the voltages of the strings are kept stable when the passive equalization is started.
In one embodiment, with continued reference to fig. 3, the single string power supply regulation circuit 21 further comprises: an accelerating capacitor (C12, C13), the accelerating capacitor (C12, C13) is connected between the cathode of the second controllable compact voltage stabilizing source and the reference pole. The accelerating capacitors (C12, C13) are used for improving the dynamic response speed of the output voltage. A differential circuit is formed by accelerating capacitors (C12 and C13), and the characteristic that the voltage at two ends of the capacitors cannot change suddenly is utilized to lead the variation of the input moment to a second controllable compact voltage-stabilizing source directly, so that the state change is accelerated, and the dynamic response speed of the output voltage is further improved.
In one embodiment, with continued reference to fig. 3, the single string power conditioning circuit 21 further includes a filter capacitor (C25, C26, C37, and C38) connected between the cathode and the anode of the second controllably tight regulator.
In one embodiment, with continued reference to fig. 1, the simulated battery 100 further includes a transition resistor R1, the transition resistor R1 being a0 Ω resistor. R1 is the transition resistance between battery management modules 300BA0 and B-, and distinguishes the negative pole B-of the power supply and the lowest end B0 of the collected voltage; the method is used for improving the stability of the voltage of the acquisition terminal. The reason why the ground of the analog battery 100 is connected to the ground of the battery management module 300 through a0 Ω resistor is that the power supply positive terminal of the analog battery 100 is connected to B + of the battery management module 300, but the highest node of the battery cell of the analog battery 100 system is not B +, so the voltage difference between the highest node voltage connected to the BMS system and B + is large, and therefore the present embodiment is provided with a transition resistor to solve the problem. This is done by designing the battery management module 300 so that the highest end of the voltage acquisition is not directly connected to B +.
Referring to fig. 4, an analog battery circuit board 150 according to an embodiment of the present invention includes a substrate and an analog battery, where the analog battery is the analog battery in the above embodiment, and the analog battery is integrated on the substrate. The PCB is 120-200 mm in length and 100-180 mm in width; for example, the length is 160mm, the width is 150mm, and the PCB body of the embodiment has small volume and is convenient to carry.
In order to realize the characteristics of small volume, convenience, portability, ultrahigh cost performance and simplicity and convenience in use, the simulation battery is integrated through the substrate, the simulation battery is more portable relative to large-scale simulation battery equipment, complicated wiring is not needed, the operation is simple and flexible, more importantly, the simulation battery test device has the same test function while being low in cost, multi-path passive equalization test can be realized, each tester can be equipped with one simulation battery circuit board 150, the resource of special simulation battery equipment is not needed to be occupied, and the utilization rate of special equipment is greatly improved.
In an embodiment, referring to fig. 5 and 9, a voltage acquisition interface circuit 60 is further integrated on the substrate, and the voltage acquisition interface circuit 60 is connected to the single-string power conditioning circuit 21 and is connected to an external acquisition line through a connection terminal. Specifically, the connecting terminal adopts a double-layer phoenix terminal with a 3.81mm interval, so that the convenience of the connecting wire is improved, and meanwhile, a plurality of paths of acquisition cables can be connected. During wiring, the voltage acquisition end of the battery management module 300 is connected to the connection terminal, and the operation is simple and convenient.
In an embodiment, referring to fig. 5 and 8, the substrate further integrates a collection line switch circuit 50, the collection line switch circuit 50 includes a dial switch, one end of the dial switch is connected to the single-string power supply regulating circuit 21, the other end of the dial switch is connected to the connection terminal, and the dial switch is used for closing or opening an external collection line. Specifically, the dip switches are patch type dip switches, and S1, S2, S3, and S4 are patch type dip switches for simulating disconnection of the acquisition line. During wiring, the collection line of the battery management module 300 is connected into the connection terminal, and the operation is simple and convenient. The dial switch controls the on and off of all the acquisition lines, the condition that battery acquisition fails is simulated, the acquisition lines are opened by turning off the dial switch, and the battery management module 300 can recognize the acquisition condition and further realize testing.
In an embodiment, referring to fig. 5 and 10, a current collection interface circuit 70 is further integrated on the substrate, the current collection interface circuit 70 includes a reference voltage unit, a sampling resistor and a precision resistor, the reference voltage unit is connected to one end of the sampling resistor, the other end of the sampling resistor is connected to the precision resistor, the precision resistor is grounded, a sampling point is formed between the sampling resistor and the precision resistor, and the sampling point is connected to the single-string power supply adjusting circuit 21. Specifically, the reference voltage unit is used for providing a reference voltage, in the embodiment, one reference voltage Vref is used for serial voltage division, current collection signals with different voltage values are output, in a BMS system which uses a precision resistor for collection, the precision resistor can be disconnected, and the interface is introduced to simulate working scenes of different charging and discharging currents.
In an embodiment, referring to fig. 5 and 11, a temperature acquisition interface circuit 80 is further integrated on the substrate, and the temperature acquisition interface circuit 80 includes a winding potentiometer, which is connected to the single-string power supply adjusting circuit 21 and is used for simulating the resistance value of the thermistor to change. Specifically, the thermistor is NTC, the winding potentiometer adopts a top-adjusting winding potentiometer (3296W) to simulate the resistance change of the NTC, the resistance change range is 0-100K omega, the precision is +/-1%, in order to simulate the durability of a battery system, the 3296W potentiometer is preferably a Bocheng long handle type potentiometer, the potentiometer is high in use frequency, and the potentiometer can be frequently used when the voltage, the current and the NTC resistance value are regulated. To accommodate NTC acquisition interfaces of different BMS systems, NTC1 and NTC2 employ different grounds GND1 and GND 2.
In an embodiment, referring to fig. 5 and 6, a dc power interface circuit 30 is further integrated on the substrate, the dc power interface circuit 30 includes a positive terminal, a negative terminal, and an indicator light, the positive terminal is connected to the current-limiting voltage-storing circuit 10, the negative terminal is connected to the end of the single-chain serial voltage-dividing circuit 20, one end of the indicator light is used for the positive connection of the dc power, and the other end of the indicator light is grounded. The positive end B + is connected with the positive electrode of the direct current power supply 200, the negative end B-is connected with the negative electrode of the direct current power supply 200, the indicator lamp is an LED lamp, the anode of the LED lamp is connected with the positive electrode of the direct current power supply 200 through a resistor R116, the cathode of the LED lamp is grounded, one LED lamp is connected between the B + and the B-and used for work indication, and the LED lamp is lighted to indicate normal work.
In an embodiment, referring to fig. 5 and fig. 7, a string number selection port circuit 40 is further integrated on the substrate, the string number selection port circuit 40 is connected to the current-limiting voltage storage circuit 10 and the single-string power regulation circuit 21, and the string number selection port circuit 40 is configured to select the number of strings of the single-string power regulation circuit 21 connected in series in the single-chain series voltage division circuit 20. The string number selection port circuit 40 of this embodiment can be used to connect the 12-way, 16-way and 24-way single-string power supply adjusting circuits 21, respectively. The serial number selection port circuit 40 comprises a first end connected with the 12 th single-serial power supply regulating circuit 21, a second end connected with the 16 th single-serial power supply regulating circuit 21 and a third end connected with the 24 th single-serial power supply regulating circuit 21. During access, a short-circuit block is inserted into the first end, which may be the second end or the third end, and at this time, the string number selection port circuit 40 short-circuits the rest of the single-string power supply adjusting circuits 21, that is, the 12-way single-string power supply adjusting circuit 21 is selected. It is understood that the string number selection port circuit 40 may be configured to other string numbers, and is not limited herein.
By implementing the embodiment, the analog battery is integrated on a substrate to form the analog battery circuit board 150, the analog battery circuit board 150 also integrates the multi-path NTC resistance test function, and the resistance value change of the NTC is simulated by using a top-tuning potentiometer; and a patch type dial switch is used for simulating the disconnection of the acquisition line. The simulation battery system is not only adjustable in voltage of the single battery core, but also adjustable in equalizing current of the battery core, and further has the functions of adjusting NTC resistance and sampling current, and the simulation battery system is rich and powerful in function. The use of one analog battery circuit board 150 addresses the need for nearly all functional test items of the battery management module 300.
The embodiment of the present invention further provides a simulated battery test system, which includes a simulated battery circuit board 150, a dc power supply 200 and a battery management module 300, where the simulated battery circuit board 150 is the simulated battery circuit board 150 in the above embodiment, the dc power supply 200 is connected to the simulated battery circuit board 150 and the battery management module 300, and the simulated battery circuit board 150 is connected to the battery management module 300.
Specifically, in the embodiment, only one dc power supply 200 (the power supply voltage requires more than 60V) is needed to complete power supply, and meanwhile, the positive electrode and the negative electrode of the power supply can be respectively connected to B + and B-on the battery management module 300 to complete power supply, and one dc power supply 200 can complete the construction of the test platform. Compared with the existing analog battery system which needs two power supply devices for power supply, the battery system has the advantages that the operation is more flexible, the wiring is simpler, and the power supply devices are saved.
Through implementing this embodiment, a platform is provided for software and hardware debugging and testing work of the battery management module 300, and the analog battery testing system of this embodiment is more powerful than the existing analog battery circuit board 150 of the resistance voltage division type, and is more portable than the analog battery system of a special analog battery device, and can perform conventional functional tests, such as overvoltage, undervoltage, passive equalization, battery cell disconnection, battery cell imbalance, NTC disconnection or short circuit, and the like. And the portable and mobile is good, small in size, convenient in connection and few in connecting wires, and only one power supply device is needed to complete the construction of the test platform. Most importantly, the cost performance is high, all testers can be equipped with one tester, the requirements for testing and debugging of the circuit board can be met under most conditions, resources of special analog battery equipment of a company do not need to be occupied, and the utilization rate of special equipment is greatly improved.
Referring to fig. 12, an embodiment of the present invention further provides a testing method for a simulated battery testing system, where the simulated battery testing system is the simulated battery testing system described in the foregoing embodiment, and the testing method includes: S110-S160.
And S110, respectively connecting the positive pole and the negative pole of the direct current power supply 200 to the positive pole and the negative pole of the direct current power supply interface circuit 30.
S120, the string number of the single-string power supply adjusting circuit 21 is selected by the string number selection port circuit 40.
S130, adjusting the output voltage of the dc power supply 200 to a preset total voltage value.
S140, adjusting an adjusting potentiometer in the single-string power supply adjusting circuit 21 to make the reference voltage of the second controllable precise voltage regulator reach a preset reference voltage value and make the voltage of the single-string power supply adjusting circuit 21 reach a preset single voltage value.
S150, adjusting the output voltage of the dc power supply 200 to make the output current of the dc power supply within a preset current range.
And S160, connecting the battery management module 300 to the simulated battery circuit board 150 for testing.
The testing method of the simulated battery testing system of the embodiment is mainly used for software and hardware debugging and testing work of the battery management module 300(BMS system). By implementing the testing method of the embodiment, the functions of overvoltage, undervoltage, cell voltage unbalance, cell disconnection, NTC short circuit and open circuit, high and low temperature charging and discharging, passive balance and the like can be debugged and tested on the BMS system. The portable solar water heater has the characteristics of strong adaptability, small volume, convenience, portability, ultrahigh cost performance, simplicity and convenience in use and the like.
Specifically, in the test process, the dc power supply 200 is first connected and the number of strings of the individual electric cores required by the test item is selected; then, adjusting the output voltage of the direct current power supply 200 to make the output voltage and the output current of the direct current power supply 200 meet the test conditions, and adjusting the adjustment potentiometer in the single-string power supply adjustment circuit 21 to make the voltage of the single-string power supply adjustment circuit 21 also meet the test conditions; finally, wiring is performed according to the test items, and each acquisition line of the battery management module 300 is connected to the simulated battery circuit board 150 as required to perform corresponding tests. The simulation battery test system of the embodiment can meet a plurality of functional tests, such as an overvoltage test, a passive equalization test, a high-low temperature charge and discharge test and the like.
In one embodiment, the step S160 includes: S161-S163.
And (3) overvoltage testing: and S161, increasing or decreasing the voltage in the single-string power supply regulating circuit 21 by using a regulating potentiometer according to the overvoltage protection voltage value preset in the battery management module 300.
Passive equalization testing: and S162, increasing the output voltage of the direct current power supply 200 and increasing the voltage of the single-string power supply regulating circuit 21 to enable the single-string power supply regulating circuit 21 to reach a passive equalization condition.
High and low temperature charge and discharge test: and S163, connecting another direct current power supply to the analog battery circuit board 150 and keeping constant current output, and adjusting the temperature in the single-string power supply regulating circuit 21 to be higher or lower by using a winding potentiometer according to the preset high-temperature discharge protection temperature value in the battery management module 300.
Referring to fig. 13, the following embodiment describes a test method of a simulated battery test system by a test example.
As shown in fig. 13, a 1-square area is a 13 th-string power supply adjusting circuit, and a left element in the 1-square area is an adjusting potentiometer, that is, a voltage-regulating power supply of a single cell; the No. 2 square area is a wiring label of the voltage acquisition line, and the numbers 0 to 24 represent the interfaces of the voltage acquisition line BAT0-BAT 24; the block area No. 3 is an NTC1 temperature sensor circuit; the No. 4 square frame area is a direct current power supply B + and B-power supply interface; the No. 5 square frame area is a battery pack string number selection interface; the box 6 is the 2.5V reference voltage test point.
S1, firstly, building a simulation battery test system, and connecting the positive pole and the negative pole of the direct current power supply to the No. 4 area interface;
s2, inserting the short-circuit block into the 12-section selection pin of the No. 5 area, and simulating the battery test system now is a platform for simulating 12 strings of single voltage. And outputting BAT0-BAT12 terminal voltage.
And S3, calculating the voltage output by the direct current power supply, wherein each string of single voltage is measured according to 3.6V, and the current limiting and voltage storing circuit reserves the voltage according to 3V. A total voltage of 3.6 × 12+3 ═ 46.2V, a dc supply voltage of 47V and a current of 0.1A were set. And starting the direct current power switch.
S4, using a universal meter to measure whether the reference voltage of the 6 region is above 2.48V (note that the voltages of the 431R end and the A end of the power supply regulating circuit of 1-12 strings are measured), if the reference voltage does not meet the requirement, firstly determining whether the circuit is damaged, and regulating a regulating potentiometer of the power supply regulating circuit again under the condition that the circuit is not damaged, and regulating the output voltage value of each string to 3.6V according to the sequence of 1-12; measuring whether the reference voltage of each string meets the requirement or not according to the sequence of 1-12; if the requirement is not met, the output voltage value of each string is reduced to 3.6V according to the sequence of 1-12. The potentiometer is adjusted in a cyclic manner until the reference voltage of each string 431 is above 2.48V and the output voltage of each string is 3.6V.
S5, observing the output current of the direct current power supply, and if the current is between 2 and 7mA, not adjusting the voltage of the direct current power supply; if the current is above 7mA, the voltage of the direct current power supply is reduced to make the current between 2 and 7 mA.
S6, turning off the direct-current power supply, and connecting the NTC temperature sensor interface of the No. 3 area to a battery core temperature acquisition port of the BMS circuit board; and then B & lt + & gt is connected to the BMS circuit board, the acquisition lines BAT0-BAT12 are connected to the voltage acquisition ports of the BMS circuit board, and finally B & lt + & gt is connected to the BMS circuit board. And opening the direct current power switch.
S7, observing the monomer voltage and the cell temperature displayed on the BMS upper computer, and adjusting the corresponding potentiometer of the temperature sensor to ensure that the temperature of each cell is 25 ℃. The monomer voltage is 3600mV +/-10 mV.
S8, increasing a certain string of voltage in the 12 strings of monomer voltages to a BMS overvoltage protection point, observing whether the BMS is in overvoltage protection, then reducing the voltage to an overvoltage recovery point, and observing whether the BMS is in overvoltage recovery, thereby realizing overvoltage test.
And S9, disconnecting the power line of the BMS circuit board, if the balance current is 45mA at the maximum, increasing the voltage of the direct current power supply to 50-52mA of the output current, and connecting the power line of the BMS circuit board. And increasing the voltage of a certain string of monomers to enable the string of monomers to reach an equilibrium condition, and observing whether the upper computer starts the passive equilibrium of the string. And then the voltage of the single body of other strings is increased to enable the single body to reach a balance condition, and whether the balance of the plurality of paths on the BMS upper computer is normally started or not is observed, so that the passive balance test is realized.
S10, connecting another direct current power supply to the B-and the P-, setting a voltage to be 2V, outputting a constant current to be 2A, turning on the direct current power supply, observing the discharging current to be 2A on the BMS upper computer, increasing the temperature of a certain path of battery cell to reach a high-temperature discharging protection point, and observing whether the BMS upper computer displays high-temperature discharging protection; and then the temperature of the battery core is adjusted to reach a high-temperature discharge recovery point, and whether the high-temperature discharge protection of the upper computer of the BMS is recovered or not is observed, so that the high-temperature and low-temperature charge and discharge test is realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An analog battery, comprising:
the single-chain series voltage division circuit comprises a plurality of single-chain power supply regulating circuits which are connected in series, the single-chain power supply regulating circuits are used for generating single battery cell voltages through voltage regulating power supply simulation and providing passive balance current, and the single battery cell voltages generated by each single-chain power supply regulating circuit simulation are independently regulated;
the current-limiting voltage storage circuit is connected to the initial end of the single-chain series voltage division circuit in series and used for providing current-limiting protection for the single-chain series voltage division circuit during overcurrent and dividing the voltage of the single-chain series voltage division circuit during overvoltage;
the current-limiting voltage-storing current is used for being connected with the anode of a direct-current power supply, and the tail end of the single-chain series voltage-dividing circuit is used for being connected with the cathode of the direct-current power supply.
2. The analog battery as claimed in claim 1, wherein the current-limiting voltage-storing circuit comprises a first triode, a first controllable precision voltage regulator, a base resistor and a first current-limiting resistor, one end of the base resistor is used for being connected with the anode of the direct current power supply, the other end of the base resistor is connected with the cathode of the first controllable precise voltage-stabilizing source, the collector of the first triode is connected with one end of the base resistor, the base of the first triode is connected with the other end of the base resistor and the cathode of the first controllable precise voltage-stabilizing source, the emitter of the first triode is connected with one end of the first current-limiting resistor, the reference electrode of the first controllable precise voltage-stabilizing source is connected with the emitter of the first triode and one end of the first current-limiting resistor, and the anode of the first controllable precise voltage-stabilizing source is connected with the other end of the first current-limiting resistor.
3. The analog battery according to claim 1 or 2, wherein the single-string power supply regulating circuit comprises a second controllable precise voltage regulator, a regulating potentiometer, a second current-limiting resistor, a voltage-stabilizing diode, a first resistor and a second resistor, the voltage-stabilizing diode is connected in series in the single-chain series voltage-dividing circuit, the anode of the second controllable precise voltage regulator is connected with the anode of the voltage-stabilizing diode, the cathode of the second controllable precise voltage regulator is connected with the cathode of the voltage-stabilizing diode through the second current-limiting resistor, the first resistor and the second resistor are connected in series between the cathode and the anode of the second controllable compact voltage regulator, the reference electrode of the second controllable compact voltage regulator is connected between the first resistor and the second resistor, and the regulating potentiometer is connected in parallel with the first resistor.
4. The analog battery of claim 3, wherein the single string power supply regulation circuit further comprises:
the accelerating capacitor is connected between the cathode of the second controllable compact voltage-stabilizing source and the reference electrode; and/or the presence of a gas in the gas,
the single-string power supply regulating circuit further comprises a filter capacitor, and the filter capacitor is connected between the cathode and the anode of the second controllable compact voltage-stabilizing source.
5. A simulated battery circuit board, characterized in that, it comprises a substrate and a simulated battery, the simulated battery is the simulated battery of any one of the above claims 1-4, the simulated battery is integrated on the substrate.
6. The battery-simulating circuit board according to claim 5, further integrated on said substrate comprising: at least one of a voltage acquisition interface circuit, an acquisition line switch circuit, a current acquisition interface circuit and a temperature acquisition interface circuit; wherein the content of the first and second substances,
the voltage acquisition interface circuit is connected with the single-string power supply regulating circuit and is connected with an external acquisition line through a connecting terminal;
the current acquisition interface circuit comprises a reference voltage unit, a sampling resistor and a precision resistor, wherein the reference voltage unit is connected with one end of the sampling resistor, the other end of the sampling resistor is connected with the precision resistor, the precision resistor is grounded, a sampling point is formed between the sampling resistor and the precision resistor, and the sampling point is connected with the single-string power supply regulating circuit;
the temperature acquisition interface circuit comprises a winding potentiometer, the winding potentiometer is connected with the single-string power supply adjusting circuit, and the winding potentiometer is used for simulating the resistance value of the thermistor to change;
the acquisition line switch circuit comprises a dial switch, wherein one end of the dial switch is connected with the single-string power supply adjusting circuit, the other end of the dial switch is connected with the connecting terminal, and the dial switch is used for closing or disconnecting an external acquisition line.
7. The battery-simulating circuit board of claim 6, further integrated on said substrate comprising:
the direct-current power supply interface circuit comprises a positive end, a negative end and an indicator light, wherein the positive end is connected with the current-limiting voltage-storing circuit, the negative end is connected with the tail end of the single-chain series voltage-dividing circuit, one end of the indicator light is used for connecting the positive electrode of the direct-current power supply, and the other end of the indicator light is grounded; and/or
And the string number selection port circuit is connected with the current-limiting voltage storage circuit and the single-string power supply regulating circuit and is used for selecting the string number of the single-string power supply regulating circuit connected in series in the single-chain series voltage division circuit.
8. A simulated battery test system, which is characterized by comprising a simulated battery circuit board, a direct current power supply and a battery management module, wherein the simulated battery circuit board is the simulated battery circuit board of any one of the claims 5 to 7, the direct current power supply is connected with the simulated battery circuit board and the battery management module, and the simulated battery circuit board is connected with the battery management module.
9. A testing method of a simulated battery testing system, wherein the simulated battery testing system is the simulated battery testing system of claim 7, the testing method comprising:
respectively connecting the positive pole and the negative pole of a direct current power supply to the positive pole and the negative pole of a direct current power supply interface circuit;
selecting the string number of the single-string power supply regulating circuit through the string number selection port circuit;
adjusting the output voltage of the direct current power supply to a preset total voltage value;
adjusting an adjusting potentiometer in the single-string power supply adjusting circuit to enable the reference voltage of a second controllable precise voltage-stabilizing source to reach a preset reference voltage value and enable the voltage of the single-string power supply adjusting circuit to reach a preset monomer voltage value;
adjusting the output voltage of the direct current power supply to enable the output current of the direct current power supply to be within a preset current range;
and connecting the battery management module to the simulation battery circuit board for testing.
10. The method of claim 9, wherein the step of connecting the battery management module to the simulated battery circuit board for testing comprises: at least one of an overvoltage test step, a passive balance test step and a high-low temperature charge-discharge test step;
and (3) overvoltage testing: according to the overvoltage protection voltage value preset in the battery management module, the voltage in the single-string power supply regulating circuit is adjusted to be high or low by using the regulating potentiometer;
passive equalization testing step: the output voltage of the direct-current power supply is increased and the voltage of the single-string power supply regulating circuit is increased, so that the single-string power supply regulating circuit reaches a passive balance condition;
high and low temperature charge and discharge testing: and connecting the other direct current power supply to the analog battery circuit board and keeping constant current output, and increasing or decreasing the temperature in the single-string power supply regulating circuit by using the winding potentiometer according to the preset high-temperature discharge protection temperature value in the battery management module.
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| CN109245206A (en) * | 2018-09-17 | 2019-01-18 | 上海空间电源研究所 | A kind of high-voltage lithium ion battery group charging control signal generation circuit |
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| CN213181942U (en) * | 2020-05-26 | 2021-05-11 | 深圳天邦达科技有限公司 | Be applicable to BMS simulation front end and gather chip functional test frock |
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