CN112379149B - On-load and on-load current measurable simulation battery pack circuit and simulation battery pack thereof - Google Patents
On-load and on-load current measurable simulation battery pack circuit and simulation battery pack thereof Download PDFInfo
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- CN112379149B CN112379149B CN202110059339.9A CN202110059339A CN112379149B CN 112379149 B CN112379149 B CN 112379149B CN 202110059339 A CN202110059339 A CN 202110059339A CN 112379149 B CN112379149 B CN 112379149B
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- 238000004088 simulation Methods 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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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
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a loaded and measurable-current-loaded analog battery pack circuit and an analog battery pack thereof. The simulation battery pack is composed of a direct-current power supply, a unit cell circuit and a constant-current source circuit. The invention has the characteristics of capacity load carrying, low cost, high current output capability and current value, measurable precision and short-circuit protection.
Description
Technical Field
The invention relates to a battery, in particular to an analog battery pack circuit with load and measurable load current.
Background
With the development of society, the application of batteries is more and more extensive, and the demand of large-scale battery packs on the market is more and more vigorous. The testing requirements for battery management systems have also risen. When a voltage acquisition circuit and an equalization circuit are tested, a real battery pack or a simulation battery pack is often adopted. There are two problems with the use of a real battery pack: 1. a plurality of uncertain factors exist in the development process of the battery management system, and the real battery pack test brings great safety risk and is easy to cause short circuit and fire of the battery pack; 2. the equalization current and the battery voltage are not controllable. By adopting the analog battery pack circuit, the analog battery pack circuit has no load capacity, particularly capacitive load, can only provide a pure voltage signal, and has overhigh cost.
Therefore, the existing real battery pack for testing has the problems of high safety risk and uncontrollable voltage and current; the adopted simulation battery pack has the problems of no loading capacity and overhigh cost.
Disclosure of Invention
The invention aims to provide an analog battery pack circuit which is loaded and can measure the loaded current. The invention has the characteristics of capacity load carrying, low cost, high current output capability and current value, measurable precision and short-circuit protection.
The technical scheme of the invention is as follows: the simulation battery pack circuit with the load and the measurable load current comprises at least one unit battery cell circuit consisting of a battery cell output voltage adjusting circuit, a voltage reference circuit, a current expanding circuit and a balanced current sampling circuit, wherein one end of the unit battery cell circuit is connected with one end of a constant current source circuit, the other end of the unit battery cell circuit is connected with a positive pole of a fixed high voltage, and the other end of the constant current source circuit is connected with a negative pole of the fixed high voltage.
In the analog battery pack circuit with load and measurable load current, the plurality of unit cell circuits are connected in series, and the positive electrode of the fixed high voltage is connected with the outermost unit cell circuit.
In the analog battery pack circuit with a load and a measurable load current, the cell output voltage adjusting circuit includes a resistor R1, a resistor R2 and a resistor R3 that are connected in parallel, and a switch K1 and a switch K2 are respectively connected in series on the resistor R1 and the resistor R2; the voltage reference circuit comprises a voltage reference U1 and a resistor R4, wherein the cathode of the voltage reference U1 is connected with one end of the resistor R4, the anode of the voltage reference U1 is connected with a negative output end, and the reference pole of the voltage reference U1 is respectively connected with a switch K1, a switch K2 and a resistor R3; the current expanding circuit comprises a triode Q1 and a resistor R5, the base electrode of the triode Q1 is connected with the cathode of a voltage reference U1, the collector electrode of the triode Q1 is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with a negative output end; the balanced current sampling circuit comprises a resistor R6 and a high common mode voltage differential amplifier U2, one end of the resistor R6 is connected with the emitters of the resistor R1, the resistor R2, the resistor R3, the resistor R4 and the triode Q1, the other end of the resistor R6 is connected with a positive output end, two ends of the resistor R6 are connected with the high common mode voltage differential amplifier U2, and the output end of the high common mode voltage differential amplifier U2 is connected with a single chip microcomputer.
In the analog battery pack circuit with a load and a measurable on-load current, the cell output voltage adjusting circuit further includes a resistor R7, one end of the resistor R7 is connected with the reference electrodes of the switch K1, the switch K2, the resistor R3 and the voltage reference U1, and the other end of the resistor R7 is connected with the negative output end.
In the analog battery pack circuit with load and measurable load current, the current expanding circuit further includes a capacitor C, one end of the capacitor C is connected with the emitter of the triode Q1, and the other end of the capacitor C is connected with the other end of the resistor R5.
In the loaded and current-measuring analog battery pack circuit, the voltage reference U1 is the LM431 of the ideological semiconductor.
In the analog battery pack circuit with load and measurable load current, the constant current source circuit comprises a MOS transistor Q2 and a voltage reference U3, the drain of the MOS transistor Q2 is connected with the negative output end, the source of the MOS transistor Q2 is connected with the reference pole of the voltage reference U3, the gate of the MOS transistor Q2 is connected with the cathode of the voltage reference U3 and the VCC end of the power supply, and the anode of the voltage reference U3 is connected with the negative pole of the fixed high voltage.
In the analog battery pack circuit with load and measurable load current, the constant current source circuit further includes a resistor R9, one end of the resistor R9 is connected to the VCC end of the power supply, and the other end of the resistor R9 is connected to the gate of the MOS transistor Q2.
In the analog battery pack circuit with a load and a measurable load current, the constant current source circuit further includes a resistor R8, one end of the resistor R8 is connected to the negative electrode of the fixed high voltage, and the other end of the resistor R8 is connected to the source of the MOS transistor Q2 and the reference electrode of the voltage reference U3.
A simulation battery pack comprises at least one direct current power supply, a simulation battery formed by unit cell circuits in the direct current power supply and a constant current source circuit, wherein the positive pole of the direct current power supply is connected with a positive output end, and the negative pole of the direct current power supply is connected with a negative output end.
Compared with the prior art, the invention has the following advantages:
1. each section of the simulation electric core has current output capability and can carry capacitive load, the current output value is high, and the precision can be measured; 2. the voltage output value of 3 grades is adjustable, so that a balance condition can be created for a battery management system, and the short-circuit protection function is realized; 3. the number of the simulated battery sections can be flexibly configured, so that the test requirements of different battery management systems are met; 4. and the cost is low because the common components are adopted for construction.
Therefore, the invention has the characteristics of capacity load carrying, low cost, high current output capability and current value, measurable precision and short-circuit protection.
Drawings
FIG. 1 is a schematic diagram of an analog battery circuit with load and measurable current;
fig. 2 is a schematic structural diagram of a unit cell circuit;
fig. 3 is a schematic diagram of the structure of a simulated battery pack.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Examples
As shown in fig. 1-2, the analog battery pack circuit with load and measurable current includes a plurality of unit cell circuits composed of a cell output voltage adjusting circuit, a voltage reference circuit, a current expanding circuit and a balanced current sampling circuit, wherein the plurality of unit cell circuits are connected in series, one end of each unit cell circuit is connected with one end of a constant current source circuit, the other end of the outermost unit cell circuit is connected with a positive pole of a fixed high voltage, and the other end of the constant current source circuit is connected with a negative pole of the fixed high voltage.
The battery cell output voltage adjusting circuit comprises a resistor R1, a resistor R2 and a resistor R3 which are connected in parallel, and one ends of a switch K1 and one ends of a switch K2 are respectively connected in series on the resistor R1 and the resistor R2; the switch K1, the switch K2 and the resistor R3 are all connected with the negative output end through the resistor R7.
The voltage reference circuit comprises a voltage reference U1 and a resistor R4, wherein the cathode of the voltage reference U1 is connected with one end of the resistor R4, the anode of the voltage reference U1 is connected with a negative output end, and the reference pole of the voltage reference U1 is respectively connected with a switch K1, a switch K2 and a resistor R3; the voltage reference U1 adopts LM431 of Italian semiconductor, LM431 is a three-terminal adjustable shunt reference voltage source with good thermal stability, and the output voltage of LM431 can be arbitrarily set to any value from Vref (2.5V) to 36V by using a resistor R3 and a resistor R7.
The current expanding circuit comprises a triode Q1 and a resistor R5, the base electrode of the triode Q1 is connected with the cathode of a voltage reference U1, the collector electrode of the triode Q1 is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with a negative output end; the device also comprises a capacitor C, wherein one end of the capacitor C is connected with an emitting electrode of the triode Q1, and the other end of the capacitor C is connected with the other end of the resistor R5; the transistor Q1 is a PNP transistor.
The balanced current sampling circuit comprises a resistor R6 and a high common mode voltage differential amplifier U2, one end of the resistor R6 is connected with the emitters of the resistor R1, the resistor R2, the resistor R3, the resistor R4 and the triode Q1, the other end of the resistor R6 is connected with a positive output end, two ends of the resistor R6 are connected with the high common mode voltage differential amplifier U2, and the output end of the high common mode voltage differential amplifier U2 is connected with a single chip microcomputer.
The constant current source circuit comprises an MOS tube Q2 and a voltage reference U3, the drain electrode of the MOS tube Q2 is connected with the negative output end, the source electrode of the MOS tube Q2 is connected with the reference electrode of the voltage reference U3, the connection point between the source electrode of the MOS tube Q2 and the reference electrode of the voltage reference U3 is connected with the negative electrode of a fixed high voltage through a resistor R8, the grid electrode of the MOS tube Q2 is connected with the cathode of the voltage reference U3, the connection point between the grid electrode of the MOS tube Q2 and the cathode of the voltage reference U3 is connected with the VCC end through a resistor R9, and the anode of the voltage reference U3 is connected with the negative electrode of the fixed high voltage.
As shown in fig. 3, another solution is also included, in which an analog battery pack includes at least one dc power supply, an analog battery formed by unit cell circuits in the analog battery pack circuit with measurable on-load current and a constant current source circuit, the positive electrode of the dc power supply is connected to the positive output terminal, and the negative electrode of the dc power supply is connected to the negative output terminal.
In practical application, the unit cell circuits are composed of a voltage reference circuit, a current expansion circuit, a cell output voltage adjusting circuit and an equalizing current sampling circuit, at least one unit cell circuit is connected with a constant current source circuit in series to form a simulation battery pack circuit, and unit cell circuits with different strings can be formed according to test requirements, so that the number of the sections of the simulation battery can be flexibly configured, and the test requirements of different battery management systems are met. A respective fixed high voltage (HV + -HV-) is applied across the analog battery circuit, and the sum of the maximum voltages of each cell circuit is approximately equal to this fixed voltage. Because the voltage value of the unit cell is adjustable, the total voltage value of the analog battery pack is possibly smaller than a fixed high voltage value (HV + -HV-), and therefore the redundant voltage difference is shared by the constant current source circuit.
In specific operation, the reference voltage is 2.5V, and when the switch K1 and the switch K2 are both off, the output voltage of the unit cell circuit is 3.65V; when the switch K1 is closed and the switch K2 is opened, the output voltage of the unit cell circuit is 3.3V; when the switch K1 is turned off and the switch K2 is turned on, the output voltage of the unit cell circuit is 2.7V. Setting the voltage value of a certain unit cell circuit to be higher than the voltage values of other unit cell circuits can create balance conditions for the BMS system.
Because the maximum load current capacity of the LM431 is only 100mA, the requirement of balanced current cannot be met, and the current is expanded by adopting a current expansion circuit of a transistor Q1 and a resistor R5. And selecting proper triode and resistor according to the magnitude of the balance current. When the unit cell circuit is connected with a large load, particularly a capacitive load, the circuit can oscillate, and a capacitor C larger than 10uF is added for compensation, so that the oscillation can be eliminated.
By sampling the voltage across resistor R6, the magnitude of the equalization current can be known. Because the common-mode voltage at two ends of the sampling resistor R6 is high, the high common-mode voltage differential amplifier U2 is arranged, the type of the high common-mode voltage differential amplifier U2 adopts INA149, and the acquired data are transmitted to the single chip microcomputer.
The constant current source circuit plays a role in voltage division and current setting. When the output voltage of the unit cell circuit changes, the voltage across the MOS transistor Q2 changes accordingly. According to kirschner HuoLaw of Fulviesis, U(CELL_N-CELL0)+U(Q2)+2.5V＝U(HV+-HV-). By adjusting the resistance value of the resistor R8, the value of the current flowing through the analog battery pack can be set.
Claims (9)
1. On-load and measurable simulation group battery circuit of on-load current, its characterized in that: the cell circuit comprises at least one unit cell circuit consisting of a cell output voltage adjusting circuit, a voltage reference circuit, a current expanding circuit and a balanced current sampling circuit, wherein one end of the unit cell circuit is connected with one end of a constant current source circuit, the other end of the unit cell circuit is connected with a positive pole of a fixed high voltage, and the other end of the constant current source circuit is connected with a negative pole of the fixed high voltage; the battery cell output voltage adjusting circuit comprises a resistor R1, a resistor R2 and a resistor R3 which are connected in parallel, and a switch K1 and a switch K2 are respectively connected in series on the resistor R1 and the resistor R2; the voltage reference circuit comprises a voltage reference U1 and a resistor R4, wherein the cathode of the voltage reference U1 is connected with one end of the resistor R4, the anode of the voltage reference U1 is connected with a negative output end, and the reference pole of the voltage reference U1 is respectively connected with a switch K1, a switch K2 and a resistor R3; the current expanding circuit comprises a triode Q1 and a resistor R5, the base electrode of the triode Q1 is connected with the cathode of a voltage reference U1, the collector electrode of the triode Q1 is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with a negative output end; the balanced current sampling circuit comprises a resistor R6 and a high common mode voltage differential amplifier U2, one end of the resistor R6 is connected with the emitters of the resistor R1, the resistor R2, the resistor R3, the resistor R4 and the triode Q1, the other end of the resistor R6 is connected with a positive output end, two ends of the resistor R6 are connected with the high common mode voltage differential amplifier U2, and the output end of the high common mode voltage differential amplifier U2 is connected with a single chip microcomputer.
2. An on-load, current-sensing analog battery pack circuit as claimed in claim 1, wherein: the unit cell circuits are multiple, the multiple unit cell circuits are connected in series, and the positive electrode of the fixed high voltage is connected with the outermost unit cell circuit.
3. An on-load, current-sensing analog battery pack circuit as claimed in claim 1, wherein: the battery cell output voltage adjusting circuit further comprises a resistor R7, one end of the resistor R7 is connected with reference electrodes of the switch K1, the switch K2, the resistor R3 and the voltage reference U1, and the other end of the resistor R7 is connected with a negative output end.
4. An on-load, current-sensing analog battery pack circuit as claimed in claim 1, wherein: the current expanding circuit further comprises a capacitor C, one end of the capacitor C is connected with an emitting electrode of the triode Q1, and the other end of the capacitor C is connected with the other end of the resistor R5.
5. An on-load, current-sensing analog battery pack circuit as claimed in claim 1, wherein: the voltage reference U1 is implemented as LM431 of the ideogrammic.
6. An on-load, current-sensing analog battery pack circuit as claimed in claim 1, wherein: the constant current source circuit comprises an MOS tube Q2 and a voltage reference U3, the drain electrode of the MOS tube Q2 is connected with the negative output end, the source electrode of the MOS tube Q2 is connected with the reference electrode of the voltage reference U3, the grid electrode of the MOS tube Q2 is connected with the cathode of the voltage reference U3 and the VCC end of the power supply, and the anode of the voltage reference U3 is connected with the negative electrode of the fixed high voltage.
7. An on-load, current-sensing analog battery pack circuit as claimed in claim 6, wherein: the constant current source circuit further comprises a resistor R9, one end of the resistor R9 is connected with a power supply VCC end, and the other end of the resistor R9 is connected with the grid electrode of the MOS transistor Q2.
8. An on-load, current-sensing analog battery pack circuit as claimed in claim 6, wherein: the constant current source circuit further comprises a resistor R8, one end of the resistor R8 is connected with the negative electrode of the fixed high voltage, and the other end of the resistor R8 is connected with the source electrode of the MOS transistor Q2 and the reference electrode of the voltage reference U3.
9. An analog battery pack comprising at least one dc power supply, an analog battery comprising the cell circuits of the analog battery pack circuit as claimed in any one of claims 1 to 8, and a constant current source circuit.
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| CN202110059339.9A CN112379149B (en) | 2021-01-18 | 2021-01-18 | On-load and on-load current measurable simulation battery pack circuit and simulation battery pack thereof |
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| CN202110059339.9A CN112379149B (en) | 2021-01-18 | 2021-01-18 | On-load and on-load current measurable simulation battery pack circuit and simulation battery pack thereof |
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| CN112379149B true CN112379149B (en) | 2021-05-04 |
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| CN114047443A (en) * | 2021-10-12 | 2022-02-15 | 博科能源系统(深圳)有限公司 | Analog battery and circuit board thereof, analog battery testing system and testing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7542858B2 (en) * | 2005-06-03 | 2009-06-02 | Lsi Corporation | Simulated battery logic testing device |
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| DE3420889A1 (en) * | 1984-06-05 | 1985-12-05 | Kodak Ag, 7000 Stuttgart | Method for electronic modelling of multi-cell batteries, using only one battery cell |
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