High-voltage isolation sampling circuit

Abstract

The utility model provides a high-voltage isolation sampling circuit, which comprises at least one sampling signal generation circuit, a corresponding first conditioning circuit, a signal gating circuit and an isolation device, and is characterized in that after the at least one sampling signal generation circuit samples at a high-voltage side, the first conditioning circuit is used for standardizing a sampling signal so as to meet the input requirement of the isolation device; the sampling points are transmitted to the isolation device one by one through the signal gating circuit, and the sampling points and the equipment on the control equipment side are insulated and isolated one by one through time division multiplexing of the isolation device, so that the safety requirement of insulated isolation between the battery side and the control equipment side is met, the use of the isolation device is reduced, and the multi-path high-voltage side acquisition cost is reduced.

Description

Technical Field

[0001] The present application relates to but is not limited to a high-voltage isolation sampling circuit. Background Art

[0002] The battery energy storage system is a large energy storage system that is composed of multiple low-voltage single cells connected in series into a battery cluster, and then multiple battery clusters connected in parallel. In order to ensure the stable operation of each battery cluster, the battery management system needs to monitor its operating status, for example: monitoring the battery cluster voltage and the temperature of related devices. Since the voltage level of the battery cluster in the energy storage system is relatively high, it is necessary to perform enhanced insulation operations when sampling it to meet safety requirements.

[0003] When sampling multiple sampling points of the energy storage system and transmitting each sampling information to multiple control devices, considering the space limitations of setting isolation devices on the control device side, isolation devices are generally set on the battery side for insulation isolation. When the number of sampling points increases, the number of corresponding isolation devices will also increase. The increase in insulation isolation cost leads to high multi-channel high-voltage side collection costs.

[0004] Therefore, how to reduce the cost of multi-channel high-voltage side data collection has become the focus of research. Utility Model Content

[0005] The present application provides a high-voltage isolation sampling circuit to solve the above-mentioned technical problems.

[0006] The embodiment of the present application provides a high-voltage isolation sampling circuit, including: at least one sampling signal generating circuit, at least one first conditioning circuit, a signal gating circuit, and an isolation device, wherein the at least one sampling signal generating circuit and the at least one first conditioning circuit correspond one to one;

[0007] The sampling signal generating circuit is used to sample the information to be measured of the energy storage system and output a sampling electrical signal;

[0008] The input port of the first conditioning circuit is electrically connected to the output port of the corresponding sampling signal generating circuit, and is used to convert the sampling electrical signal into a first standard signal; the value range of the first standard signal is determined based on the value range of the input signal of the isolation device;

[0009] The signal gating circuit is provided with a plurality of input terminals and an output terminal, wherein the plurality of input terminals are electrically connected to the output terminal of the at least one first conditioning circuit, and is used for outputting the first standard signal obtained from the input terminal from the output terminal when any input terminal is connected to the output terminal thereof;

[0010] The input end of the isolation device is electrically connected to the output end of the signal selection circuit, and is used to output the corresponding second standard signal from its output end when the first standard signal is obtained; the input end and output end of the isolation device are physically isolated.

[0011] In the above technical solution, in the high-voltage isolation sampling circuit, at least one sampling signal generating circuit uses a first conditioning circuit to standardize the sampling signal after sampling on the high-voltage side to meet the input requirements of the isolation device, and then transmits it to the isolation device one by one through the signal selection circuit. Through the time-sharing multiplexing of the isolation device, each sampling point and the control device side device are insulated and isolated one by one, which not only meets the safety requirements for insulation isolation between the battery side and the control device side, but also reduces the use of isolation devices and reduces the cost of multi-channel high-voltage side acquisition.

[0012] In a feasible embodiment, the signal gating circuit includes an electronic switch and a plurality of gating signal generating circuits;

[0013] The electronic switch is provided with a plurality of input terminals, a plurality of control terminals and an output terminal, the plurality of input terminals of the electronic switch are used as a plurality of input terminals of the signal gating circuit, the output terminal of the electronic switch is used as an output terminal of the signal gating circuit, the plurality of control terminals of the electronic switch are electrically connected to the output terminals of the plurality of gating signal generating circuits, and are used to adjust the connection states of the plurality of input terminals and output terminals based on the plurality of gating signals generated by the plurality of gating signal generating circuits;

[0014] The number of the gating signal generating circuits is less than or equal to the number of the input terminals of the electronic switch;

[0015] The input terminal and the output terminal of the selection signal generating circuit are physically isolated from each other.

[0016] In a feasible embodiment, the selection signal generating circuit includes an optocoupler device or a digital isolator.

[0017] In the above technical solution, the isolation is performed in a plurality of selection signal generating circuits that need to input data to the high-voltage isolation sampling circuit, thereby further ensuring the safety of the high-voltage isolation sampling circuit.

[0018] In a feasible embodiment, the energy storage system includes a plurality of battery clusters and a plurality of circuit breakers, each battery cluster is electrically connected to a first end of a corresponding circuit breaker, and a second end of each circuit breaker is electrically connected to a busbar;

[0019] The first input terminal of the sampling signal generating circuit is electrically connected to the first terminal or the second terminal of the circuit breaker, and the second input terminal of the sampling signal generating circuit is electrically connected to the negative electrode of the battery cluster electrically connected to the circuit breaker or is grounded.

[0020] In a feasible embodiment, the output port of the sampling signal generating circuit includes a first output terminal and a second output terminal;

[0021] The sampling signal generating circuit includes a plurality of resistors connected in series, wherein the plurality of resistors includes a target resistor;

[0022] Among the multiple resistors connected in series, the first end of the resistor located at the first position serves as the first input end of the sampling signal generating circuit, the second end of the resistor located at the last position serves as the second input end of the sampling signal generating circuit, the first end of the target resistor serves as the first output end of the sampling signal generating circuit, and the second end of the target resistor serves as the second output end of the sampling signal generating circuit.

[0023] In a feasible embodiment, the sampling signal generating circuit includes a temperature sensor, and the temperature sensor is arranged in a temperature region to be measured of the energy storage system;

[0024] The output end of the temperature sensor serves as an output port of the sampling signal generating circuit, and is used to output an electrical signal corresponding to the temperature of the temperature area to be measured.

[0025] In a feasible embodiment, the temperature sensor is arranged in the area where the busbar of the energy storage system is located.

[0026] In a feasible embodiment, the first conditioning circuit includes a differential amplifier, the input port of the first conditioning circuit includes a positive input terminal and a negative input terminal of the differential amplifier circuit, and the output terminal of the differential amplifier serves as the output terminal of the first conditioning circuit.

[0027] In a feasible embodiment, the high-voltage isolation sampling circuit further includes a second filtering circuit; the second filtering circuit includes at least one RC filtering circuit connected in series;

[0028] The second filter circuit is provided with an input terminal, a first output terminal and a second output terminal;

[0029] The input end of the second filter circuit is electrically connected to the output end of the signal selection circuit, the first output end of the second filter circuit is electrically connected to the first input end of the isolation device, and the second output end of the second filter circuit is electrically connected to the second input end of the isolation device.

[0030] In a feasible embodiment, the high-voltage isolation sampling circuit further includes a second conditioning circuit and a data collector, and the second conditioning circuit includes a differential amplifier circuit;

[0031] The output port of the isolation device is electrically connected to the input port of the second conditioning circuit, the output end of the second conditioning circuit is electrically connected to the data collector, and the second conditioning circuit is used to convert the second standard signal output by the isolation device into a third standard signal;

[0032] The value range of the third standard signal is determined based on the value range of the input signal of the data collector.

[0033] The present application provides a high-voltage isolation sampling circuit, comprising: at least one sampling signal generating circuit and a corresponding first conditioning circuit, a signal gating circuit, and an isolation device. After sampling on the high-voltage side, the at least one sampling signal generating circuit uses the first conditioning circuit to standardize the sampling signal to meet the input requirements of the isolation device, and then transmits the sampling signal to the isolation device one by one through the signal gating circuit. Through time-division multiplexing of the isolation device, each sampling point and the control device side device are insulated and isolated one by one, which not only meets the safety requirements for insulation isolation between the battery side and the control device side, but also reduces the use of isolation devices and reduces the cost of multi-channel high-voltage side acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0035] Figure 1A and Figure 1B A schematic diagram of the structure of some exemplary energy storage systems provided in this application;

[0036] Figure 2 A schematic diagram of the structure of a high-voltage isolation sampling circuit provided in some embodiments of the present application;

[0037] Figure 3A and Figure 3B A circuit diagram of a sampling signal generating circuit provided in some embodiments of the present application;

[0038] Figure 4 A circuit diagram of a first conditioning circuit provided in some embodiments of the present application;

[0039] Figure 5 A circuit diagram of a signal gating circuit provided in some embodiments of the present application;

[0040] Figure 6 Related circuit diagrams of isolation devices provided in some embodiments of the present application.

[0041] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application are also intended to include plural forms, unless the context clearly indicates other meanings.

[0044] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the above elements.

[0045] The lithium battery energy storage system is a large energy storage system formed by connecting multiple low-voltage single cells in series into a battery cluster, and then connecting multiple battery clusters in parallel. In an exemplary embodiment, the structural diagram of the energy storage system is as follows Figure 1A and Figure 1B shown.

[0046] Figure 1A The schematic diagram of the structure of the battery module shows that the battery module 101 includes a plurality of single cells, the positive and negative electrodes of each single cell are sequentially connected in series, and the voltage value of the battery module 101 is the sum of the voltages of the plurality of single resistors connected in series.

[0047] The connection structure of a battery stack composed of multiple battery modules and the corresponding battery management system is as follows Figure 1BAs shown. Among them, the positive and negative electrodes of multiple battery modules 101 are connected in series to form a battery cluster 201 with a larger voltage value. Each battery cluster 201 is connected to the busbar through a corresponding control switch QF. When the control switch QF is turned on, each battery cluster 201 is connected in parallel to form a battery stack. Among them, the control switch QF includes a circuit breaker and a contactor.

[0048] Based on the above battery stack architecture, the battery management system also performs hierarchical management and control accordingly.

[0049] For each battery module 101, a corresponding battery management unit (BMU) 102 is provided to collect status information of each battery cell in the battery module 101. The status information includes voltage, temperature, and the like.

[0050] For each battery cluster 201, a corresponding battery cluster management unit (BCU) 202 is set to collect the status information of the battery cluster 201 and the status information of each battery module 101 contained therein, and control the conduction status of the circuit breaker and contactor connected to the battery cluster 201 and the operation status of the associated air conditioning system based on the collected information. The status of the battery cluster 201 includes the battery cluster voltage, current, battery cluster insulation information, etc.

[0051] For the battery stack, a battery array management system (BMS) 302 is set up to collect information of all battery cells transmitted by the BCU 202, and transmit the information to the background energy management system (EMS) for monitoring, and also perform corresponding protection actions when there is a battery status alarm.

[0052] In order to ensure the stable operation of each battery cluster, the battery management system needs to monitor its operating status, for example, the voltage of the battery cluster and the temperature of related devices. At present, the voltage level of the battery cluster in the energy storage system is 1500V, and the sampled data needs to be transmitted to the control device side (for example: EMS) through reinforced insulation operation for display, alarm or execution of control operations based on the sampled data to meet safety regulations.

[0053] When sampling the energy storage system, in one case, the same sampling data is transmitted to multiple control devices. In order to save sampling costs, the data is generally transmitted to each control device after performing insulation operation on the battery side. When the number of sampling points of the energy storage system increases, considering the space limitations of setting isolation devices on the control device side, isolation devices are still set on the battery side for insulation isolation. However, the increase in the number of sampling points will lead to an increase in the number of corresponding isolation devices set in the sampling circuit. The increase in insulation isolation costs leads to high multi-channel high-voltage side acquisition costs.

[0054] Therefore, how to reduce the cost of multi-channel high-voltage side data collection has become the focus of research.

[0055] In order to solve the above problems, the present application provides a high-voltage isolation sampling circuit. The technical concept of the present application is: the electrical signals sampled by the energy storage system are transmitted one by one to the input channel of the control device side through the signal gating circuit, an isolation device is set in the input channel, and the insulation isolation of each sampling signal generation circuit is achieved by multiplexing the isolation device, which not only meets the safety requirements of insulation isolation between the battery side and the control device side, but also reduces the use of isolation devices and reduces the cost of multi-channel high-voltage side acquisition.

[0056] The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0057] Figure 2 A schematic diagram of a high voltage isolation sampling circuit provided in some embodiments of the present application is shown in FIG. Figure 2 As shown, the high-voltage isolation sampling circuit includes: at least one sampling signal generating circuit 401, at least one first conditioning circuit 402, a signal gating circuit 403, and an isolation device 404, wherein the at least one sampling signal generating circuit 401 and the at least one first conditioning circuit 402 correspond one to one.

[0058] The sampling signal generating circuit 401 is used to sample the information to be measured of the energy storage system and output a sampling electrical signal.

[0059] In some embodiments, the information sampled on the high voltage side of the energy storage system includes: the voltage value between the positive and negative electrodes of the battery cluster, the ground isolation voltage value of the battery cluster, the temperature of the environment where the battery cluster is located, and the temperature of the busbar electrically connected to the battery cluster.

[0060] In other embodiments, relevant information of battery cells and battery modules to be regulated is also provided.

[0061] The input port of the first conditioning circuit 402 is electrically connected to the output port of the corresponding sampling signal generating circuit 401 for converting the sampling electrical signal into a first standard signal; the value range of the first standard signal is determined based on the value range of the input signal of the isolation device.

[0062] The signal selection circuit 403 has multiple input terminals and one output terminal, and the multiple input terminals are electrically connected to the output terminal of at least one first conditioning circuit 402, and is used to output the first standard signal obtained from the input terminal from the output terminal when any input terminal is connected to its output terminal.

[0063] The signal gating circuit 403 changes the first standard signal outputted from its output terminal by adjusting the input terminal connected to its output terminal.

[0064] The input end of the isolation device 404 is electrically connected to the output end of the signal selection circuit 403, and is used to output the corresponding second standard signal from its output end when the first standard signal is obtained. The input end and the output end of the isolation device 404 are physically isolated to prevent high voltage or dangerous signals from being transmitted to the control device.

[0065] In the above technical solution, in the high-voltage isolation sampling circuit, at least one sampling signal generating circuit uses a first conditioning circuit to standardize the sampling signal after sampling on the high-voltage side to meet the input requirements of the isolation device, and then transmits it to the isolation device one by one through the signal selection circuit. Through the time-sharing multiplexing of the isolation device, each sampling point and the control device are insulated and isolated one by one, which not only meets the safety requirements for insulation isolation between the battery side and the control device side, but also reduces the use of isolation devices and reduces the cost of multi-channel high-voltage side acquisition.

[0066] The circuit structure of each unit in the high-voltage isolation sampling circuit is further explained below.

[0067] When sampling the information on the high voltage side, the sampling signal generating circuit 401 samples the voltage value when the battery cluster is connected to the busbar in one scenario.

[0068] The battery cluster is connected to the busbar through its electrically connected circuit breaker. Before being connected to the busbar, the circuit breaker is disconnected, and the sampling signal generating circuit 401 needs to measure the voltage values ​​at both ends of the circuit breaker relative to the negative pole of the battery cluster respectively. When the difference between the two voltage values ​​is less than the preset threshold, it is determined that the access condition is met and the circuit breaker can be controlled to close; but when the difference between the two voltage values ​​is greater than or equal to the preset threshold, it is determined that the access condition is not met, which will cause damage to the battery cluster, and the circuit breaker is kept disconnected.

[0069] When measuring voltage, the sampling signal generating circuit is provided with a first input terminal and a second input terminal. When the first terminal of the circuit breaker is electrically connected to the battery cluster to be tested, and the second terminal of the circuit breaker is electrically connected to the busbar, the first input terminal of the sampling signal generating circuit is electrically connected to the first terminal of the circuit breaker, and the second input terminal is electrically connected to the negative electrode of the battery cluster to be tested, so as to measure the voltage value between the positive and negative electrodes of the battery cluster.

[0070] When the first input terminal of the sampling signal generating circuit is electrically connected to the second terminal of the circuit breaker, and the second input terminal is electrically connected to the negative electrode of the battery cluster to be tested, the voltage value between the busbar and the negative electrode of the battery cluster is measured.

[0071] The condition for controlling the circuit breaker to close is that the difference between the two measured voltage values ​​is less than a preset threshold.

[0072] In another scenario, the insulation voltage of the battery cluster and the busbar is measured to determine the insulation performance of the battery cluster and the busbar.

[0073] When the first input terminal of the sampling signal generating circuit is electrically connected to the first terminal of the circuit breaker and the second input terminal is connected to the ground, the insulation voltage of the battery cluster is measured;

[0074] When the first input terminal of the sampling signal generating circuit is electrically connected to the second terminal of the circuit breaker and the second input terminal is connected to the ground, the insulation voltage of the busbar is measured.

[0075] The sampling signal generation circuit for measuring voltage can be applied as follows Figure 3A The voltage divider circuit shown. In the voltage divider circuit, multiple resistors R1 to RM are connected in series, and one of the resistors (such as RN+1) is used as the target resistor. The first end DN of the resistor R1 located at the first position is used as the first input end of the sampling signal generating circuit 401, and the second end DP of the resistor RM located at the last position is used as the second input end of the sampling signal generating circuit 401. The first end (i.e., the upper side) of the target resistor RN+1 is used as the first output end of the sampling signal generating circuit 401, and the second end (i.e., the lower side) of the target resistor RN+1 is used as the second output end of the sampling signal generating circuit 401. The electrical signal output by the sampling signal generating circuit 401 is the voltage V1.

[0076] The number of the plurality of resistors connected in series is determined based on the withstand voltage, power, and the size of the resistor layout on the circuit board.

[0077] The sampling signal generating circuit for measuring temperature can use a temperature sensor, which is set in the temperature area to be measured in the energy storage system, such as the area where the busbar is located. The output end of the temperature sensor serves as the output port of the sampling signal generating circuit 401, which is used to output an electrical signal corresponding to the temperature of the temperature area to be measured.

[0078] The circuit schematic diagram of the sampling signal generating circuit 401 for measuring temperature is as follows: Figure 3B As shown. In this circuit, a target resistor RN+1 and a reference resistor Rf are included. The first end of the target resistor RN+1 is electrically connected to the first preset voltage, the second end is electrically connected to the first end of the reference resistor Rf, and the second end of the reference resistor Rf is grounded. Among them, the target resistor RN+1 is a thermistor, and its resistance value changes with the adjustment of the ambient temperature. It and the reference resistor Rf also have different voltage divisions for the first preset voltage, thereby outputting different voltage values ​​V1 based on different temperatures.

[0079] Figure 4 A circuit diagram of a first conditioning circuit provided in some embodiments of the present application, such as Figure 4 As shown, it includes a differential amplifier U2, a resistor R11, a resistor R12, a resistor R13, a resistor R14, and capacitors C1, C2, and C3.

[0080] The positive input terminal of the differential amplifier U2 is electrically connected to the first end of the capacitor C3, the first end of the resistor R14, and the second end of the resistor R13. The reverse input terminal of the differential amplifier U2 is electrically connected to the second end of the resistor R12, the second end of the capacitor C2, and the second end of the resistor R11. The first end of the capacitor C2, the first end of the resistor R12, and the output terminal of the differential amplifier U2 are electrically connected as the output terminal of the first conditioning circuit. The second end of the capacitor C3 and the second end of the resistor R14 are grounded. The first end of the resistor R11 and the first end of the resistor R13 constitute the input port of the first conditioning circuit.

[0081] The capacitor C1 is connected between two ends of the input port and is used to filter the sampled electrical signal V1 generated by the sampled signal generating circuit 401 .

[0082] The filtered sampled electrical signal is adjusted in voltage by the differential amplifier U2 and its electrically connected resistors and capacitors. The gain of the differential amplifier U2 is determined based on the resistance values ​​of the resistors R11, R12, R13, and R14. The capacitance of the capacitors C1, C2, and C3 is used to adjust the filtering parameters in the first conditioning circuit 402.

[0083] Since the differential amplifier amplifies the differential signal between the positive input terminal and the negative input terminal, the same common mode components in the differential signal can be effectively suppressed.

[0084] Figure 5 A circuit diagram of a signal gating circuit provided in some embodiments of the present application, such as Figure 5 As shown, the signal gating circuit 403 includes an electronic switch U1 and a plurality of gating signal generating circuits. The gating signal generating circuit includes a physically isolable control device, such as Figure 5The optical coupler device shown outputs a high level when a high level is obtained, and outputs a low level when a low level is obtained, and information is transmitted between the output end and the input end via an optical signal to achieve physical isolation. In other embodiments, the optical coupler device can be replaced by a digital isolator.

[0085] The electronic switch U1 is provided with a plurality of input terminals, a plurality of control terminals and an output terminal. The plurality of input terminals of the electronic switch U1 are used as the plurality of input terminals in0 to in7 of the signal selection circuit 403, and are used to obtain the HV0 to HV3 and T1 to T4 signals. The output terminal OUT of the electronic switch is used as the output terminal of the signal selection circuit 403. The plurality of control terminals A, B and C of the electronic switch U1 are respectively electrically connected to the output terminals of the corresponding selection signal generating circuits, and are used to adjust the connection states of the plurality of input terminals and the output terminals based on the plurality of selection signals generated by the plurality of selection signal generating circuits, wherein at any time, only one input terminal is connected to the output terminal. The number of the selection signal generating circuits is less than or equal to the number of the input terminals of the electronic switch.

[0086] In one embodiment, each input terminal of the electronic switch U1 may be controlled to be connected to the output terminal in sequence in a polling manner.

[0087] In other embodiments, the change of the selection signal can be preset and arranged according to the sampling frequencies of different signals, so that the signal obtained by the corresponding input terminal is output according to the preset arrangement sequence.

[0088] Figure 5 The eight-channel gate controlled by three control signals is shown, and gates of other number of channels can also be selected based on the number of sampled electrical signals. The electronic switch is an analog electronic switch.

[0089] Figure 6 Related circuit diagrams of isolation devices provided in some embodiments of the present application, such as Figure 6 As shown, a second filtering circuit 405 is further provided between the input end of the isolation device 404 and the output end of the signal gating circuit 403 .

[0090] In some embodiments, the second filtering circuit 405 includes at least one RC filtering circuit connected in series. Figure 6 The second filter circuit 405 is shown as a series connection of an RC filter circuit consisting of a resistor R31 and a capacitor C4 and an RC filter circuit consisting of a resistor R32 and a capacitor C5.

[0091] The second filter circuit 405 is provided with an input end, a first output end, and a second output end. The input end of the second filter circuit 405 is electrically connected to the output end of the signal selection circuit 403, the first output end of the second filter circuit 405 is electrically connected to the first input end of the isolation device 404, and the second output end of the second filter circuit 405 is electrically connected to the second input end of the isolation device 404.

[0092] exist Figure 6 In the circuit structure shown, the first end of the resistor R31 is electrically connected to the output end OUT of the signal selection circuit 403 as the input end of the second filter circuit 405, the first end of the capacitor C5 is electrically connected to the first input end of the isolation device 404 as the first output end of the second filter circuit 405, and the second end of the capacitor C5 is electrically connected to the second input end of the isolation device 404 as the second output end of the second filter circuit 405.

[0093] When the electrical signal output by the isolation device 404 needs to be transmitted to the data collector ADC, a second conditioning circuit 406 needs to be provided between the output end thereof and the input end of the data collector ADC to adjust the voltage value.

[0094] The output port of the isolation device 404 is electrically connected to the input port of the second conditioning circuit 406, and the output end of the second conditioning circuit 406 is electrically connected to the data acquisition device ADC. The second conditioning circuit 406 is used to convert the second standard signal output by the isolation device 404 into a third standard signal.

[0095] The value range of the third standard signal is determined based on the value range of the input signal of the data collector.

[0096] In one embodiment, the second conditioning circuit 406 includes a differential amplifier circuit, and the circuit structure has been explained in the above embodiments and will not be described again here.

[0097] Those skilled in the art will readily appreciate other embodiments of the present application after considering the description and practicing the contents disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The description and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0098] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A high voltage isolation sampling circuit, characterized in that: include: At least one sampling signal generating circuit, at least one first conditioning circuit, a signal gating circuit, and an isolation device, wherein the at least one sampling signal generating circuit and the at least one first conditioning circuit correspond one to one; The sampling signal generating circuit is used to sample the information to be measured of the energy storage system and output a sampling electrical signal; The input port of the first conditioning circuit is electrically connected to the output port of the corresponding sampling signal generating circuit, and is used to convert the sampling electrical signal into a first standard signal; The value range of the first standard signal is determined based on the value range of the input signal of the isolation device; The signal gating circuit is provided with a plurality of input terminals and an output terminal, wherein the plurality of input terminals are electrically connected to the output terminal of the at least one first conditioning circuit, and is used for outputting the first standard signal obtained from the input terminal from the output terminal when any input terminal is connected to the output terminal thereof; The input end of the isolation device is electrically connected to the output end of the signal selection circuit, and is used to output the corresponding second standard signal from its output end when the first standard signal is obtained; the input end and output end of the isolation device are physically isolated.

2. The high voltage isolation sampling circuit according to claim 1, characterized in that: The signal gating circuit includes an electronic switch and a plurality of gating signal generating circuits; The electronic switch is provided with a plurality of input terminals, a plurality of control terminals and an output terminal, the plurality of input terminals of the electronic switch are used as a plurality of input terminals of the signal gating circuit, the output terminal of the electronic switch is used as an output terminal of the signal gating circuit, the plurality of control terminals of the electronic switch are electrically connected to the output terminals of the plurality of gating signal generating circuits, and are used to adjust the connection states of the plurality of input terminals and output terminals based on the plurality of gating signals generated by the plurality of gating signal generating circuits; The number of the gating signal generating circuits is less than or equal to the number of the input terminals of the electronic switch; The input terminal and the output terminal of the selection signal generating circuit are physically isolated from each other.

3. The high voltage isolation sampling circuit according to claim 2, characterized in that: The selection signal generating circuit includes an optocoupler device or a digital isolator.

4. The high voltage isolation sampling circuit according to claim 1, characterized in that: The energy storage system comprises a plurality of battery clusters and a plurality of circuit breakers, each battery cluster is electrically connected to a first end of a corresponding circuit breaker, and a second end of each circuit breaker is electrically connected to a busbar; The first input terminal of the sampling signal generating circuit is electrically connected to the first terminal or the second terminal of the circuit breaker, and the second input terminal of the sampling signal generating circuit is electrically connected to the negative electrode of the battery cluster electrically connected to the circuit breaker or is grounded.

5. The high voltage isolation sampling circuit according to claim 4, characterized in that: The output port of the sampling signal generating circuit includes a first output terminal and a second output terminal; The sampling signal generating circuit includes a plurality of resistors connected in series, wherein the plurality of resistors includes a target resistor; Among the multiple resistors connected in series, the first end of the resistor located at the first position serves as the first input end of the sampling signal generating circuit, the second end of the resistor located at the last position serves as the second input end of the sampling signal generating circuit, the first end of the target resistor serves as the first output end of the sampling signal generating circuit, and the second end of the target resistor serves as the second output end of the sampling signal generating circuit.

6. The high voltage isolation sampling circuit according to claim 1, characterized in that: The sampling signal generating circuit includes a temperature sensor, and the temperature sensor is arranged in a temperature region to be measured of the energy storage system; The output end of the temperature sensor serves as an output port of the sampling signal generating circuit, and is used to output an electrical signal corresponding to the temperature of the temperature area to be measured.

7. The high voltage isolation sampling circuit according to claim 6, characterized in that: The temperature sensor is arranged in the area where the busbar of the energy storage system is located.

8. The high voltage isolation sampling circuit according to claim 1, characterized in that: The first conditioning circuit includes a differential amplifier, the input port of the first conditioning circuit includes a positive input terminal and a negative input terminal of the differential amplifier, and the output terminal of the differential amplifier serves as the output terminal of the first conditioning circuit.

9. The high voltage isolation sampling circuit according to claim 1, characterized in that: The high-voltage isolation sampling circuit further includes a second filtering circuit; the second filtering circuit includes at least one RC filtering circuit connected in series; The second filter circuit is provided with an input terminal, a first output terminal and a second output terminal; The input end of the second filter circuit is electrically connected to the output end of the signal selection circuit, the first output end of the second filter circuit is electrically connected to the first input end of the isolation device, and the second output end of the second filter circuit is electrically connected to the second input end of the isolation device.

10. The high voltage isolation sampling circuit according to claim 1, characterized in that: The high-voltage isolation sampling circuit also includes a second conditioning circuit and a data collector, wherein the second conditioning circuit includes a differential amplifier circuit; The output port of the isolation device is electrically connected to the input port of the second conditioning circuit, the output end of the second conditioning circuit is electrically connected to the data collector, and the second conditioning circuit is used to convert the second standard signal output by the isolation device into a third standard signal; The value range of the third standard signal is determined based on the value range of the input signal of the data collector.

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