Energy storage battery detection device and method

Abstract

The present invention provides an energy storage battery detection device and method in the field of energy storage battery detection technology. The device includes a single chip microcomputer, an ADC chip, an upper-link isolation communication unit, an interconnection isolation communication unit, a CAN communication unit, a DC voltage acquisition unit, a DC current acquisition unit and a zero magnetic flux current sensor; the single chip microcomputer is respectively connected to the ADC chip, the upper-link isolation communication unit, the interconnection isolation communication unit and the CAN communication unit; one end of the DC current acquisition unit is connected to the ADC chip, and the other end is connected to the zero magnetic flux current sensor; the DC voltage acquisition unit is connected to the ADC chip. The advantages of the present invention are: greatly improving the accuracy, reliability and flexibility of energy storage battery detection.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage battery detection, and in particular to an energy storage battery detection device and method. Background Art

[0002] Online detection of energy storage batteries is to detect the status and performance of energy storage batteries in real time through sensors and detection equipment. For example, by detecting the current, voltage, temperature, internal chemical composition and other parameters of the energy storage battery, abnormal conditions of the energy storage battery can be discovered in time and corresponding measures can be taken. Common energy storage battery detection methods include the following:

[0003] 1. Current-voltage detection: By detecting the current and voltage changes of the energy storage battery, the performance and status of the energy storage battery are evaluated; 2. Temperature detection: By detecting the temperature changes of the energy storage battery, the thermal stability and safety of the energy storage battery are evaluated; 3. Pressure detection: By detecting the pressure changes of the energy storage battery, the packaging integrity and safety of the energy storage battery are evaluated; 4. Infrared thermal imaging detection: By detecting the surface temperature distribution of the energy storage battery, the thermal balance and thermal runaway of the energy storage battery are evaluated.

[0004] Traditional energy storage battery detection systems such as Figure 4 As shown, the voltage, current and other functions are mainly detected by the sensors of the BMS (including MBMU and SBMU), and the protection is realized by communicating with the PCS and EMS. The EMS controls the PCS to charge and discharge the energy storage battery. The BMS is a battery management system, the MBMU is a main battery system management unit, the SBMU is an auxiliary battery management unit, the PCS is an energy storage inverter, and the EMS is an energy management system.

[0005] The traditional energy storage battery detection system has the following disadvantages: 1. PCS generally uses DSP, single-chip microcomputer or FPGA to control voltage and current. The accuracy of its built-in ADC chip is generally 12 bits. According to GB / T34120-20175.4.9 and 5.4.10, the current stabilization accuracy is required to be ≤±5%, and the voltage stabilization accuracy is ≤±2%, but the error cannot meet the actual protection needs; taking the 280Ah, 1331V battery cabinet as an example, the corresponding current maximum error is ±14A, and the voltage maximum error is ±26.62V. For lithium iron phosphate single cells, the nominal voltage is 3.2V, and the voltage range is 2.8~3.6V. Therefore, the voltage error of PCS makes it unable to meet the protection requirements, that is, the protection accuracy is poor; 2. The protection of the energy storage battery detection system is completely dependent on the BMS. If the BMS is abnormal, effective protection cannot be performed; 3. For centralized energy storage, due to the parallel connection of multiple clusters, the current between each cluster may be inconsistent, and each cluster current needs to be detected, but the traditional energy storage battery detection system cannot achieve this function.

[0006] Therefore, how to provide an energy storage battery detection device and method to improve the accuracy, reliability and flexibility of energy storage battery detection has become a technical problem that needs to be solved urgently. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a device and method for detecting an energy storage battery, so as to improve the accuracy, reliability and flexibility of energy storage battery detection.

[0008] In a first aspect, the present invention provides an energy storage battery detection device, including a single chip microcomputer, an ADC chip, an upper isolation communication unit, an interconnection isolation communication unit, a CAN communication unit, a DC voltage acquisition unit, a DC current acquisition unit and a zero flux current sensor;

[0009] The single chip microcomputer is respectively connected to the ADC chip, the upper isolation communication unit, the interconnection isolation communication unit and the CAN communication unit; one end of the DC current acquisition unit is connected to the ADC chip, and the other end is connected to the zero flux current sensor; the DC voltage acquisition unit is connected to the ADC chip.

[0010] Furthermore, the uplink isolation communication unit and the interconnection isolation communication unit are both provided with an RS485 interface, a CAN interface or an Ethernet interface.

[0011] Further, the DC voltage acquisition unit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4;

[0012] One end of the resistor R5 is connected to the resistor R1, the resistor R3 and the capacitor C1, and the other end is connected to the capacitor C3 and the ADC chip;

[0013] One end of the resistor R6 is connected to the resistor R2 , the resistor R4 , and the capacitor C2 , and the other end of the resistor R6 is connected to the capacitor C4 and the ADC chip.

[0014] Further, the DC current acquisition unit includes a resistor R7, a resistor R8, a resistor R9, a capacitor C5 and a capacitor C6 connected;

[0015] One end of the resistor R8 is connected to one end of the resistor R7 and the zero flux current sensor, and the other end is connected to the capacitor C5 and the ADC chip;

[0016] One end of the resistor R9 is connected to the other end of the resistor R7 and the zero flux current sensor, and the other end is connected to the capacitor C6 and the ADC chip.

[0017] Furthermore, the model of the single chip microcomputer is GD32F470ZGT6.

[0018] Furthermore, the model of the ADC chip is SGM58601.

[0019] Furthermore, the model of the zero flux current sensor is CSA601.

[0020] Furthermore, the model of the CAN communication unit is CA-IS3062W.

[0021] In a second aspect, the present invention provides a method for detecting an energy storage battery, comprising the following steps:

[0022] Step S1, connecting the DC voltage acquisition unit and the DC current acquisition unit of each energy storage battery detection device to a battery cabinet of one cluster of the energy storage battery detection system respectively, connecting the upper isolation communication unit to the PCS and the EMS, and connecting each energy storage battery detection device through the interconnection isolation communication unit;

[0023] Step S2, the EMS sets one of the energy storage battery detection devices as the main detection device;

[0024] Step S3: The main detection device calculates the first total voltage, the first total current and the first total accumulated capacity in real time through each energy storage battery detection device, and uploads the first total voltage, the first total current and the first total accumulated capacity to the EMS;

[0025] Step S4, the EMS obtains, through the MBMU, a second total voltage, a second total current, and a second total accumulated capacity collected and calculated by each SBMU, and uploads the second total voltage, the second total current, and the second total accumulated capacity to the EMS;

[0026] Step S5, the EMS calculates a voltage error, a current error, and a capacity error through the first total voltage, the first total current, the first total accumulated capacity, the second total voltage, the second total current, and the second total accumulated capacity.

[0027] Furthermore, in step S5, the voltage error is calculated as follows:

[0028] Voltage error = (1-(Vbms2-Vbms1) / (Vtst2-Vtst1))*100%;

[0029] The calculation formula of the current error is:

[0030] Current error = (1-(Ibms2-Ibms1) / (Itst2-Itst1))*100%;

[0031] The calculation formula of the capacity error is:

[0032] Capacity error = (1-(Cbms2-Cbms1) / (Ctst2-Ctst1))*100%;

[0033] Among them, Vbms2 represents the second total voltage at time t2; Vbms1 represents the second total voltage at time t1; Vtst2 represents the first total voltage at time t2; Vtst1 represents the first total voltage at time t1; I bms2 represents the second total current at time t2; Ibms1 represents the second total current at time t1; Itst2 represents the first total current at time t2; Itst1 represents the first total current at time t1; Cbms2 represents the second total cumulative capacity at time t2; Cbms1 represents the second total cumulative capacity at time t1; Ctst2 represents the first total cumulative capacity at time t2; Ctst1 represents the first total cumulative capacity at time t1.

[0034] The advantages of the present invention are:

[0035] By setting up an energy storage battery detection device including a single chip microcomputer, an ADC chip, an upper isolation communication unit, an interconnection isolation communication unit, a CAN communication unit, a DC voltage acquisition unit, a DC current acquisition unit and a zero magnetic flux current sensor, the energy storage battery detection device can communicate in isolation with the upper device through the upper isolation communication unit, communicate in isolation with other energy storage battery detection devices through the interconnection isolation communication unit, monitor the communication data of the BMS through the CAN communication unit, collect voltage data through the DC voltage acquisition unit, and collect current data through the DC current acquisition unit and the zero magnetic flux current sensor; the voltage error, current error and capacity error can be calculated by combining the voltage data and current data collected by the energy storage battery detection device with the voltage data and current data collected by the BMS, and then the detection data can be corrected through the relevant errors, and the energy storage battery detection device can effectively improve the protection accuracy of the PCS by combining with the PCS, and can effectively improve the protection accuracy of the EMS by combining with the EMS, and can also provide effective protection if the BMS is abnormal, and can also collect relevant data for each cluster of battery cabinets (energy storage batteries) through multiple energy storage battery detection devices, which ultimately greatly improves the accuracy, reliability and flexibility of energy storage battery detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0037] Figure 1 The invention discloses a circuit principle block diagram of an energy storage battery detection device.

[0038] Figure 2 It is a circuit diagram of a DC voltage acquisition unit and a DC current acquisition unit of the present invention.

[0039] Figure 3 The present invention is a flow chart of a method for detecting an energy storage battery.

[0040] Figure 4 It is the circuit principle block diagram of the traditional energy storage battery detection system.

[0041] Figure 5 It is a circuit principle block diagram of the present invention. DETAILED DESCRIPTION

[0042] The technical solution in the embodiment of the present application has the following general idea: the energy storage battery detection device collects voltage data through a DC voltage acquisition unit, and collects current data through a DC current acquisition unit and a zero-flux current sensor. The voltage data and current data collected by the energy storage battery detection device are combined with the voltage data and current data collected by the BMS to calculate the voltage error, current error and capacity error, and then the detection data is corrected through the relevant errors. The energy storage battery detection device can effectively improve the protection accuracy of the PCS when combined with the PCS, and can effectively improve the protection accuracy of the EMS when combined with the EMS. If the BMS is abnormal, it can also provide effective protection. Through multiple energy storage battery detection devices, relevant data can be collected for each cluster of battery cabinets respectively, thereby improving the accuracy, reliability and flexibility of energy storage battery detection.

[0043] Please refer to Figures 1 to 5 As shown, a preferred embodiment of an energy storage battery detection device of the present invention includes a single chip microcomputer, an ADC chip, an upper isolation communication unit, an interconnection isolation communication unit, a CAN communication unit, a DC voltage acquisition unit, a DC current acquisition unit and a zero magnetic flux current sensor; the single chip microcomputer is used to control the operation of the energy storage battery detection device; the ADC chip is used to perform analog-to-digital conversion on the data collected by the DC voltage acquisition unit and the DC current acquisition unit; the upper isolation communication unit is used to communicate with the upper device; the interconnection isolation communication unit is used to communicate with other energy storage battery detection devices; the CAN communication unit is used to monitor the communication data of the BMS; the DC voltage acquisition unit is used to collect the voltage value of the energy storage battery of the battery cabinet; the DC current acquisition unit is used to collect the current value of the energy storage battery of the battery cabinet; the zero magnetic flux current sensor is used to provide high-precision current measurement, and has the characteristics of fast response, strong anti-interference ability, simple structure, and convenient maintenance;

[0044] The single-chip microcomputer is respectively connected to the ADC chip, the upper-link isolation communication unit, the interconnection isolation communication unit and the CAN communication unit; one end of the DC current acquisition unit is connected to the ADC chip, and the other end is connected to the zero-flux current sensor; the DC voltage acquisition unit is connected to the ADC chip. The ADC chip is connected to the single-chip microcomputer via an SPI interface.

[0045] The uplink isolation communication unit and the interconnection isolation communication unit are both provided with an RS485 interface, a CAN interface or an Ethernet interface.

[0046] The DC voltage acquisition unit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4;

[0047] One end of the resistor R5 is connected to the resistor R1, the resistor R3 and the capacitor C1, and the other end is connected to the capacitor C3 and the ADC chip;

[0048] One end of the resistor R6 is connected to the resistor R2 , the resistor R4 , and the capacitor C2 , and the other end of the resistor R6 is connected to the capacitor C4 and the ADC chip.

[0049] The DC current acquisition unit includes a resistor R7, a resistor R8, a resistor R9, a capacitor C5 and a capacitor C6; the resistor R7 is used to convert the current value collected by the zero flux current sensor into a voltage value; the resistor R8, the resistor R9, the capacitor C5 and the capacitor C6 are used to filter the voltage value input by the resistor R7;

[0050] One end of the resistor R8 is connected to one end of the resistor R7 and the zero flux current sensor, and the other end is connected to the capacitor C5 and the ADC chip;

[0051] One end of the resistor R9 is connected to the other end of the resistor R7 and the zero flux current sensor, and the other end is connected to the capacitor C6 and the ADC chip.

[0052] The model of the single chip microcomputer is GD32F470ZGT6.

[0053] The model of the ADC chip is SGM58601.

[0054] The model of the zero flux current sensor is CSA601.

[0055] The model of the CAN communication unit is CA-IS3062W.

[0056] A preferred embodiment of a method for detecting an energy storage battery of the present invention comprises the following steps:

[0057] Step S1, connecting the DC voltage acquisition unit and the DC current acquisition unit of each energy storage battery detection device to a battery cabinet of one cluster of the energy storage battery detection system respectively, connecting the upper isolation communication unit to the PCS and the EMS, and connecting each energy storage battery detection device through the interconnection isolation communication unit;

[0058] Step S2, the EMS sets one of the energy storage battery detection devices as the main detection device; in specific implementation, the energy storage battery detection devices may negotiate, for example, the energy storage battery detection device with the smallest address is always used as the main detection device;

[0059] Step S3: The main detection device calculates the first total voltage, the first total current and the first total accumulated capacity in real time through each energy storage battery detection device, and uploads the first total voltage, the first total current and the first total accumulated capacity to the EMS;

[0060] The calculation formula of the first total cumulative capacity is:

[0061]

[0062] Step S4, the EMS obtains, through the MBMU, a second total voltage, a second total current, and a second total accumulated capacity collected and calculated by each SBMU, and uploads the second total voltage, the second total current, and the second total accumulated capacity to the EMS;

[0063] Step S5, the EMS calculates a voltage error, a current error, and a capacity error through the first total voltage, the first total current, the first total accumulated capacity, the second total voltage, the second total current, and the second total accumulated capacity.

[0064] In step S5, the voltage error is calculated as follows:

[0065] Voltage error = (1-(Vbms2-Vbms1) / (Vtst2-Vtst1))*100%;

[0066] The calculation formula of the current error is:

[0067] Current error = (1-(Ibms2-Ibms1) / (Itst2-Itst1))*100%;

[0068] The calculation formula of the capacity error is:

[0069] Capacity error = (1-(Cbms2-Cbms1) / (Ctst2-Ctst1))*100%;

[0070] Among them, Vbms2 represents the second total voltage at time t2; Vbms1 represents the second total voltage at time t1; Vtst2 represents the first total voltage at time t2; Vtst1 represents the first total voltage at time t1; I bms2 represents the second total current at time t2; Ibms1 represents the second total current at time t1; Itst2 represents the first total current at time t2; Itst1 represents the first total current at time t1; Cbms2 represents the second total cumulative capacity at time t2; Cbms1 represents the second total cumulative capacity at time t1; Ctst2 represents the first total cumulative capacity at time t2; Ctst1 represents the first total cumulative capacity at time t1.

[0071] In summary, the advantages of the present invention are:

[0072] By setting up an energy storage battery detection device including a single chip microcomputer, an ADC chip, an upper isolation communication unit, an interconnection isolation communication unit, a CAN communication unit, a DC voltage acquisition unit, a DC current acquisition unit and a zero magnetic flux current sensor, the energy storage battery detection device can communicate in isolation with the upper device through the upper isolation communication unit, communicate in isolation with other energy storage battery detection devices through the interconnection isolation communication unit, monitor the communication data of the BMS through the CAN communication unit, collect voltage data through the DC voltage acquisition unit, and collect current data through the DC current acquisition unit and the zero magnetic flux current sensor; the voltage error, current error and capacity error can be calculated by combining the voltage data and current data collected by the energy storage battery detection device with the voltage data and current data collected by the BMS, and then the detection data can be corrected through the relevant errors, and the energy storage battery detection device can effectively improve the protection accuracy of the PCS by combining with the PCS, and can effectively improve the protection accuracy of the EMS by combining with the EMS, and can also provide effective protection if the BMS is abnormal, and can also collect relevant data for each cluster of battery cabinets (energy storage batteries) through multiple energy storage battery detection devices, which ultimately greatly improves the accuracy, reliability and flexibility of energy storage battery detection.

[0073] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A storage battery detection device, characterized in that: It includes a single chip microcomputer, an ADC chip, an upper connection isolation communication unit, an interconnection isolation communication unit, a CAN communication unit, a DC voltage acquisition unit, a DC current acquisition unit and a zero flux current sensor; The single chip microcomputer is respectively connected to the ADC chip, the upper isolation communication unit, the interconnection isolation communication unit and the CAN communication unit; one end of the DC current acquisition unit is connected to the ADC chip, and the other end is connected to the zero flux current sensor; the DC voltage acquisition unit is connected to the ADC chip.

2. An energy storage battery detection device as claimed in claim 1, characterized in that: The uplink isolation communication unit and the interconnection isolation communication unit are both provided with an RS485 interface, a CAN interface or an Ethernet interface.

3. The energy storage battery detection device according to claim 1, characterized in that: The DC voltage acquisition unit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4; One end of the resistor R5 is connected to the resistor R1, the resistor R3 and the capacitor C1, and the other end is connected to the capacitor C3 and the ADC chip; One end of the resistor R6 is connected to the resistor R2 , the resistor R4 , and the capacitor C2 , and the other end of the resistor R6 is connected to the capacitor C4 and the ADC chip.

4. The energy storage battery detection device according to claim 1, characterized in that: The DC current acquisition unit includes a resistor R7, a resistor R8, a resistor R9, a capacitor C5 and a capacitor C6 connected; One end of the resistor R8 is connected to one end of the resistor R7 and the zero flux current sensor, and the other end is connected to the capacitor C5 and the ADC chip; One end of the resistor R9 is connected to the other end of the resistor R7 and the zero flux current sensor, and the other end is connected to the capacitor C6 and the ADC chip.

5. The energy storage battery detection device according to claim 1, characterized in that: The model of the single chip microcomputer is GD32F470ZGT6.

6. The energy storage battery detection device according to claim 1, characterized in that: The model of the ADC chip is SGM58601.

7. The energy storage battery detection device according to claim 1, characterized in that: The model of the zero flux current sensor is CSA601.

8. The energy storage battery detection device according to claim 1, characterized in that: The model of the CAN communication unit is CA-IS3062W.

9. A method for detecting an energy storage battery, characterized in that: The method requires the use of the energy storage battery detection device according to any one of claims 1 to 8, comprising the following steps: Step S1, connecting the DC voltage acquisition unit and the DC current acquisition unit of each energy storage battery detection device to a battery cabinet of one cluster of the energy storage battery detection system respectively, connecting the upper isolation communication unit to the PCS and the EMS, and connecting each energy storage battery detection device through the interconnection isolation communication unit; Step S2, the EMS sets one of the energy storage battery detection devices as the main detection device; Step S3: The main detection device calculates the first total voltage, the first total current and the first total accumulated capacity in real time through each energy storage battery detection device, and uploads the first total voltage, the first total current and the first total accumulated capacity to the EMS; Step S4, the EMS obtains, through the MBMU, a second total voltage, a second total current, and a second total accumulated capacity collected and calculated by each SBMU, and uploads the second total voltage, the second total current, and the second total accumulated capacity to the EMS; Step S5, the EMS calculates a voltage error, a current error, and a capacity error through the first total voltage, the first total current, the first total accumulated capacity, the second total voltage, the second total current, and the second total accumulated capacity.

10. A method for detecting an energy storage battery as claimed in claim 9, characterized in that: In step S5, the voltage error is calculated as follows: Voltage error = (1-(Vbms2-Vbms1) / (Vtst2-Vtst1))*100%; The calculation formula of the current error is: Current error = (1-(Ibms2-Ibms1) / (Itst2-Itst1))*100%; The calculation formula of the capacity error is: Capacity error = (1-(Cbms2-Cbms1) / (Ctst2-Ctst1))*100%; Wherein, Vbms2 represents the second total voltage at time t2; Vbms1 represents the second total voltage at time t1; Vtst2 represents the first total voltage at time t2; Vtst1 represents the first total voltage at time t1; I bms2 represents the second total current at time t2; I bms1 represents the second total current at time t1; I tst2 represents the first total current at time t2; I tst1 represents the first total current at time t1; Cbms2 represents the second total accumulated capacity at time t2; Cbms1 represents the second total accumulated capacity at time t1; Ctst2 represents the first total accumulated capacity at time t2; Ctst1 represents the first total accumulated capacity at time t1.

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