Sampling circuit of energy storage system and energy storage system

Abstract

The utility model relates to the technical field of energy storage power supplies, in particular to a sampling circuit of an energy storage system and the energy storage system, and the sampling circuit of the energy storage system comprises a sampling module and an isolation module. The sampling module is connected with a battery cluster, the sampling module is further connected with the isolation module, and the isolation module is used for being connected with a controller; and the sampling module is also used for receiving a control signal. The sampling module is used for collecting the output voltage of the battery cluster according to the control signal and inputting the output voltage to the isolation module so as to output the output voltage to the controller through the isolation module. On the basis, the electrical interference in the output voltage can be isolated through the isolation module, so that the high voltage on the battery cluster is prevented from being input into the controller, and the safety of the energy storage system is improved while the output voltage of the battery cluster is monitored in real time.

Description

[Technical field]

[0001] The utility model relates to the technical field of energy storage power supplies, and in particular to a sampling circuit of an energy storage system and an energy storage system. [Background technology]

[0002] As a type of electrochemical energy storage under new energy storage, industrial and commercial energy storage is currently developing rapidly with the influence of a series of driving factors such as continuous policy guidance, severe electricity consumption situation, increased demand for backup power, and overall improvement in storage economy. In order to monitor the battery status in real time and ensure consumer safety, the high-voltage sampling circuit is used to monitor the battery cluster voltage of the industrial and commercial energy storage system in real time.

[0003] However, the existing sampling circuit does not control the resistance accuracy, so the final sampling cannot achieve high accuracy. In addition, in industrial and commercial energy storage products, the battery cluster voltage is high, which is dangerous. Therefore, it is necessary to sample and monitor the high voltage with isolation protection. [Contents of the utility model]

[0004] The embodiment of the utility model provides a sampling circuit of an energy storage system and an energy storage system, aiming to solve the technical problems of low precision and low safety of the sampling circuit of the energy storage system in the prior art.

[0005] In order to solve the above technical problems, a technical solution adopted by the embodiment of the utility model is: providing a sampling circuit of an energy storage system, the sampling circuit of the energy storage system comprising a sampling module and an isolation module;

[0006] The sampling module is connected to the battery cluster, and is also connected to the isolation module, and the isolation module is used to connect to the controller; the sampling module is also used to receive a control signal;

[0007] The sampling module is used for collecting the output voltage of the battery cluster according to the control signal, and inputting the output voltage to the isolation module, so as to output the output voltage to the controller through the isolation module.

[0008] Optionally, the sampling module includes a control unit and a sampling unit;

[0009] The control unit is connected to the sampling unit, the sampling unit is connected to the output end of the battery cluster, and the sampling unit is also used to connect to the isolation module;

[0010] The control unit is used to receive a control signal, and control the sampling unit to collect the output voltage of the battery cluster based on the control signal;

[0011] The sampling unit is used to output the collected output voltage to the isolation module.

[0012] Optionally, the control unit includes a photo MOS tube P1, a switch tube Q6, a resistor R93, a resistor R106 and a resistor R112;

[0013] The first pin of the optical MOS tube P1 is connected to the first voltage through the resistor R93, the second pin of the optical MOS tube P1 is connected to the first end of the switch tube Q6, the control end of the switch tube Q6 is connected to the controller through the resistor R106, the control end of the switch tube Q6 is also connected to the ground through the resistor R112, the second end of the switch tube Q6 is used for grounding, and the optical MOS tube P1 is also connected to the sampling unit.

[0014] Optionally, the sampling unit includes a resistor R94, a resistor R95, a resistor R96, a resistor R97, a resistor R107, a resistor R108, a resistor R109, a resistor R110 and a resistor R111;

[0015] The resistor R94 is connected to the sixth pin of the photo MOS tube P1, the resistor R94, the resistor R95, the resistor R96 and the resistor R97 are connected in series, the resistor R97 is also connected to the battery cluster, the resistor R107 is connected to the fourth pin of the photo MOS tube P1, the resistor R107, the resistor R108, the resistor R109 and the resistor R110 are connected in series, the resistor R110 is connected to the first end of the resistor R111, the first end of the resistor R111 is also connected to the isolation module, and the second end of the resistor R111 is used for grounding.

[0016] Optionally, the sampling circuit of the energy storage system further includes a conversion module;

[0017] The conversion module performs SPI communication with the controller through the isolation module.

[0018] Optionally, the conversion module includes an analog-to-digital conversion chip U25, a resistor R168, a resistor R169, a resistor R170, and a resistor R171;

[0019] The first pin of the analog-to-digital conversion chip U25 is connected to the isolation module through the resistor R168, the second pin of the analog-to-digital conversion chip U25 is connected to the isolation module through the resistor R170, the fourth pin of the analog-to-digital conversion chip U25 is connected to the sampling module, the ninth pin of the analog-to-digital conversion chip U25 is connected to the isolation module through the resistor R169, and the tenth pin of the analog-to-digital conversion chip U25 is connected to the isolation module through the resistor R171.

[0020] Optionally, the isolation module includes an isolation chip U24, a resistor R164, a resistor R165, a resistor R166, a resistor R167, a capacitor C115, a capacitor C118, a capacitor C119 and a capacitor C120;

[0021] The third pin of the isolation chip U24 is connected to the second voltage through the resistor R165, the third pin of the isolation chip U24 is also grounded through the capacitor C118, the fourth pin of the isolation chip U24 is connected to the second voltage through the resistor R166, the fourth pin of the isolation chip U24 is also grounded through the capacitor C119, the fifth pin of the isolation chip U24 is connected to the second voltage through the resistor R167, the fourth pin of the isolation chip U24 is also grounded through the capacitor C120, and the third pin, fourth pin, fourth pin and sixth pin of the isolation chip U24 are all connected to the The controller is connected, the seventh pin of the isolation chip U24 is connected to the second voltage, the tenth pin of the isolation chip U24 is connected to the first voltage, the tenth pin of the isolation chip U24 is also grounded through the capacitor C115, the eleventh pin of the isolation chip U24 is connected to the ninth pin of the analog-to-digital conversion chip U25, the twelfth pin of the isolation chip U24 is connected to the tenth pin of the analog-to-digital conversion chip U25, the thirteenth pin of the isolation chip U24 is connected to the second pin of the analog-to-digital conversion chip U25, and the fourteenth pin of the isolation chip U24 is connected to the first pin of the analog-to-digital conversion chip U25.

[0022] Optionally, the sampling circuit of the energy storage system further includes a voltage follower module;

[0023] The voltage follower module is connected to the sampling module and the isolation module respectively;

[0024] The voltage follower module is used for receiving the output voltage and outputting the output voltage to the isolation module.

[0025] Optionally, the voltage follower module includes a dual-channel operational amplifier U22, a resistor R145, a resistor R143, a capacitor C110 and a capacitor C108;

[0026] The third pin of the dual-channel operational amplifier U22 is connected to the sampling module through the resistor R145, and the third pin of the dual-channel operational amplifier U22 is also grounded through the capacitor C110. The second pin of the dual-channel operational amplifier U22 is connected to the first pin of the dual-channel operational amplifier U22, and the first pin of the dual-channel operational amplifier U22 is connected to the isolation module through the resistor R143, and the first pin of the dual-channel operational amplifier U22 is also grounded through the capacitor C108.

[0027] In order to solve the above technical problems, another technical solution adopted by the embodiment of the utility model is: to provide an energy storage system, the energy storage system comprising:

[0028] Controller;

[0029] A battery cluster, wherein the battery cluster includes at least two battery cells; and

[0030] The sampling circuit of the energy storage system as described above.

[0031] Different from the related art, the utility model provides a sampling circuit of an energy storage system and an energy storage system, wherein the sampling circuit of the energy storage system includes a sampling module and an isolation module; the sampling module is connected to the battery cluster, and the sampling module is also connected to the isolation module, and the isolation module is used to connect to the controller; the sampling module is also used to receive a control signal. The sampling module is used to collect the output voltage of the battery cluster according to the control signal, and input the output voltage to the isolation module, so as to output the output voltage to the controller through the isolation module. Based on this, the electrical interference in the output voltage can be isolated by the isolation module, thereby avoiding the high voltage on the battery cluster from being input into the controller, thereby improving the safety of the energy storage system while monitoring the output voltage of the battery cluster in real time.

Brief Description of the Drawings

[0032] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0033] Figure 1 This is an application scenario provided by the embodiment of the utility model;

[0034] Figure 2 It is a structural block diagram of a sampling circuit of an energy storage system provided by an embodiment of the utility model;

[0035] Figure 3 It is a circuit diagram of a sampling module provided by an embodiment of the utility model;

[0036] Figure 4 is a circuit diagram of a conversion module provided by an embodiment of the utility model;

[0037] Figure 5 is a circuit diagram of an isolation module provided by an embodiment of the utility model;

[0038] Figure 6 It is a circuit diagram of a voltage follower module provided in an embodiment of the utility model. [Specific implementation method]

[0039] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0040] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0041] When an element is referred to as being “connected to” another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween.

[0042] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more.

[0043] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0044] See also Figure 1 , Figure 1 This is an application scenario provided by the embodiment of the utility model, such as Figure 1 As shown, the application scenario includes an energy storage system 1 and a load 2 , wherein the energy storage system 1 is used to be connected to the load 2 , and the energy storage system 1 is used to supply power to the load 2 .

[0045] Further, such as Figure 1 As shown, the energy storage system 1 includes a battery cluster 100, a controller 200 and a sampling circuit 300 of the energy storage system, wherein the sampling circuit 300 of the energy storage system is connected to the battery cluster 100, and the controller 200 is respectively connected to the sampling circuit 300 of the energy storage system and the battery cluster 100. The battery cluster 100 includes at least two battery cells 10 (not shown), and the at least two battery cells 10 are connected in parallel.

[0046] Specifically, when the energy storage system 1 is connected to the load 2, the controller 200 sends a control signal to the sampling circuit 300 of the energy storage system, so that the sampling circuit 300 of the energy storage system detects the output voltage of the battery cluster 100 based on the control signal, and feeds the output voltage back to the controller 200, so that the controller 200 can monitor the output voltage of the battery cluster 100 in real time. It should be noted that, since the battery cluster 100 includes a plurality of battery cells 10, when the energy storage system 1 supplies power to the load 2, it may output voltage to the load 2 at the same time. At this time, if the output voltage is too large, it may cause damage to the devices in the load 2. Therefore, the output voltage of the battery cluster 100 is monitored in real time by the controller 200, so that when a large voltage is output, the connection between the load 2 and the energy storage system 1 is disconnected, thereby protecting the load 2 while avoiding safety accidents caused by the large voltage output.

[0047] See also Figure 2 , Figure 2 is a structural block diagram of a sampling circuit of an energy storage system provided by an embodiment of the utility model, such as Figure 2 As shown, the sampling circuit 300 of the energy storage system includes a sampling module 31 and an isolation module 32;

[0048] The sampling module 31 is connected to the battery cluster 100 , and is also connected to the isolation module 32 , and the isolation module 32 is used to connect to the controller 200 ; the sampling module 31 is also used to receive a control signal;

[0049] The sampling module 31 is used for collecting the output voltage of the battery cluster 100 according to the control signal, and inputting the output voltage to the isolation module 32 , so as to output the output voltage to the controller 200 through the isolation module 32 .

[0050] Specifically, when the sampling module 31 is connected to the load 2, the controller 200 will send a control signal to the sampling module 31 to enable the sampling module 31 to start collecting the output voltage of the battery cluster 100. After the sampling module 31 collects the output voltage, it will output the output voltage to the controller 200 through the isolation module 32, so that the controller 200 can monitor the output voltage of the energy storage system 1 in real time to avoid the voltage output by the battery cluster 100 being too large and thus damaging the load 2.

[0051] Among them, Figure 2 As shown, the sampling module 31 includes a control unit 311 and a sampling unit 312;

[0052] The control unit 311 is connected to the sampling unit 312 , the sampling unit 312 is connected to the output end of the battery cluster 100 , and the sampling unit 312 is also used to connect to the isolation module 32 ;

[0053] The control unit 311 is used to receive a control signal, and control the sampling unit 312 to collect the output voltage of the battery cluster 100 based on the control signal;

[0054] The sampling unit 312 is used to output the collected output voltage to the isolation module 32 .

[0055] Further, such as Figure 3 As shown, Figure 3 is a circuit diagram of a sampling module provided by an embodiment of the utility model, wherein the control unit 311 includes a photo MOS tube P1, a switch tube Q6, a resistor R93, a resistor R106 and a resistor R112;

[0056] The first pin of the optical MOS tube P1 is connected to the first voltage 51 through the resistor R93, the second pin of the optical MOS tube P1 is connected to the first end of the switch tube Q6, the control end of the switch tube Q6 is connected to the controller 200 through the resistor R106, the control end of the switch tube Q6 is also grounded through the resistor R112, the second end of the switch tube Q6 is used for grounding, and the optical MOS tube P1 is also connected to the sampling unit 312. Optionally, the model of the optical MOS tube P1 is HSSR-61A0D. In some embodiments, the optical MOS tube of HSSR-61A0D can also be replaced by an optical MOS tube with the same function.

[0057] Further, such as Figure 3 As shown, the sampling unit 312 includes a resistor R94, a resistor R95, a resistor R96, a resistor R97, a resistor R107, a resistor R108, a resistor R109, a resistor R110 and a resistor R111;

[0058] The resistor R94 is connected to the sixth pin of the photo MOS tube P1, the resistor R94, the resistor R95, the resistor R96 and the resistor R97 are connected in series, the resistor R97 is also connected to the battery cluster 100, the resistor R107 is connected to the fourth pin of the photo MOS tube P1, the resistor R107, the resistor R108, the resistor R109 and the resistor R110 are connected in series, the resistor R110 is connected to the first end of the resistor R111, the first end of the resistor R111 is also connected to the isolation module 32, and the second end of the resistor R111 is used for grounding.

[0059] Specifically, when the energy storage system 1 is not connected to the load 2 , the resistor in the sampling unit 312 is equivalent to a large resistor. At this time, the large resistor can effectively ensure the insulation performance of the energy storage system 1 to effectively prevent the large voltage in the battery cluster 100 from flowing out.

[0060] When the energy storage system is connected to the load 2, the switch tube Q6 receives the control signal (BAT-CTL) output by the controller 200 based on the resistor R106, and is in a conducting state based on the control signal. At this time, the photo MOS tube P1 is also turned on. When the photo MOS tube P1 is turned on, the output voltage (BAT+) of the battery cluster 100 flows into the ground terminal through the resistor R97, the resistor R96 to the resistor R110 and the resistor R111, and the output voltage of the battery cluster 100 can be determined by collecting the voltage on the resistor R111.

[0061] In some embodiments, Figure 2 As shown, the sampling circuit 300 of the energy storage system also includes a conversion module 33, and the conversion module 33 performs SPI communication with the controller 200 through the isolation module 32. Among them, the conversion module 33 is mainly used to receive the output voltage output by the sampling module 31, and convert the output voltage into a digital signal, and finally perform SPI communication (Serial Peripheral interface) with the controller 200 through the isolation module 32 to transmit the digital signal to the controller 200, so that the controller 200 determines the output voltage of the battery cluster 100 according to the digital signal. It should be noted that the SPI communication mainly uses a separate data line and a separate clock signal to ensure perfect synchronization between the sending end and the receiving end. Among them, the side that generates the clock is called the host (controller), and the other side is called the slave (conversion module).

[0062] In some embodiments, see Figure 4 , Figure 4 is a circuit diagram of a conversion module provided by an embodiment of the utility model, such as Figure 4 As shown, the conversion module 33 includes an analog-to-digital conversion chip U25, a resistor R168, a resistor R169, a resistor R170 and a resistor R171;

[0063] The first pin of the analog-to-digital conversion chip U25 is connected to the isolation module 32 through the resistor R168, the second pin of the analog-to-digital conversion chip U25 is connected to the isolation module 32 through the resistor R170, the fourth pin of the analog-to-digital conversion chip U25 is connected to the sampling module 31, the ninth pin of the analog-to-digital conversion chip U25 is connected to the isolation module 32 through the resistor R169, and the tenth pin of the analog-to-digital conversion chip U25 is connected to the isolation module 32 through the resistor R171. Optionally, the model of the analog-to-digital conversion chip U25 is ADS1118. In some embodiments, the analog-to-digital conversion chip of ADS1118 can also be replaced by an analog-to-digital conversion chip with the same function.

[0064] For further information, see Figure 5 , Figure 5 is a circuit diagram of an isolation module provided by an embodiment of the utility model, such as Figure 5 As shown, the isolation module 32 includes an isolation chip U24, a resistor R164, a resistor R165, a resistor R166, a resistor R167, a capacitor C115, a capacitor C118, a capacitor C119 and a capacitor C120;

[0065] The third pin of the isolation chip U24 is connected to the second voltage 52 through the resistor R165, the third pin of the isolation chip U24 is also grounded through the capacitor C118, the fourth pin of the isolation chip U24 is connected to the second voltage 52 through the resistor R166, the fourth pin of the isolation chip U24 is also grounded through the capacitor C119, the fifth pin of the isolation chip U24 is connected to the second voltage 52 through the resistor R167, the fourth pin of the isolation chip U24 is also grounded through the capacitor C120, and the third pin, fourth pin, fourth pin and sixth pin of the isolation chip U24 are all connected to the The controller 200 is connected, the seventh pin of the isolation chip U24 is connected to the second voltage 52, the tenth pin of the isolation chip U24 is connected to the first voltage 51, the tenth pin of the isolation chip U24 is also grounded through the capacitor C115, the eleventh pin of the isolation chip U24 is connected to the ninth pin of the analog-to-digital conversion chip U25, the twelfth pin of the isolation chip U24 is connected to the tenth pin of the analog-to-digital conversion chip U25, the thirteenth pin of the isolation chip U24 is connected to the second pin of the analog-to-digital conversion chip U25, and the fourteenth pin of the isolation chip U24 is connected to the first pin of the analog-to-digital conversion chip U25. Optionally, the model of the isolation chip U24 is CA-IS3741HW. In some embodiments, the isolation chip of CA-IS3741HW can also be replaced by an isolation chip with the same function.

[0066] Specifically, when the sampling module 31 collects the output voltage of the battery cluster 100, the fourth pin of the analog-to-digital conversion chip U25 receives the output voltage, converts the output voltage into a digital signal, and outputs the digital signal to the isolation chip U24 through the ninth pin of the analog-to-digital conversion chip U25. After receiving the digital signal, the isolation chip U24 outputs the digital signal to the controller 200 through the sixth pin, so that the controller 200 determines the voltage data of the battery cluster 100 according to the digital signal. It should be noted that the first pin, the second pin, the ninth pin and the tenth pin of the analog-to-digital conversion chip U25 perform SPI communication with the controller 200 through the isolation chip U24. It can be known that the A (right side of the isolation chip) and B (left side of the isolation chip) sides of the isolation chip U24 are connected to different power supply voltages and ground terminals respectively, so that the A and B sides of the isolation chip U24 are completely isolated, thereby achieving the function of isolation protection.

[0067] In some embodiments, Figure 2 As shown, the sampling circuit 300 of the energy storage system further includes a voltage following module 34 ; the voltage following module 34 is connected to the sampling module 31 and the isolation module 32 respectively.

[0068] For details, please refer to Figure 6 , Figure 6 is a circuit diagram of a voltage follower module provided in an embodiment of the utility model, such as Figure 6 As shown, the voltage follower module 34 includes a dual-channel operational amplifier U22, a resistor R145, a resistor R143, a capacitor C110 and a capacitor C108;

[0069] The third pin of the dual-channel operational amplifier U22 is connected to the sampling module 31 through the resistor R145, the third pin of the dual-channel operational amplifier U22 is also grounded through the capacitor C110, the second pin of the dual-channel operational amplifier U22 is connected to the first pin of the dual-channel operational amplifier U22, the first pin of the dual-channel operational amplifier U22 is connected to the isolation module 32 through the resistor R143, and the first pin of the dual-channel operational amplifier U22 is also grounded through the capacitor C108. Optionally, the model of the dual-channel operational amplifier U22 is TLV2316IDR. In some embodiments, the dual-channel operational amplifier of TLV2316IDR can also be replaced by a dual-channel operational amplifier with the same function.

[0070] It should be noted that the first, second and third pins of the dual-channel operational amplifier U22 are an operational amplifier, and together with the resistor R145 and the capacitor C110, form a voltage follower. The resistor R145 is a current-limiting resistor to prevent large currents from damaging the dual-channel operational amplifier U22, and the capacitor C110 is a filter capacitor to maintain signal stability. It can be known that the voltage follower has the characteristics of high input impedance and low output impedance. Therefore, the dual-channel operational amplifier U22 is formed into a voltage follower to achieve impedance matching.

[0071] The utility model provides a sampling circuit of an energy storage system, the sampling circuit of the energy storage system includes a sampling module and an isolation module; the sampling module is connected to a battery cluster, the sampling module is also connected to the isolation module, the isolation module is used to connect to a controller; the sampling module is also used to receive a control signal. The sampling module is used to collect the output voltage of the battery cluster according to the control signal, and input the output voltage to the isolation module, so as to output the output voltage to the controller through the isolation module. Based on this, the electrical interference in the output voltage can be isolated by the isolation module, thereby avoiding the high voltage on the battery cluster from being input into the controller, thereby achieving real-time monitoring of the output voltage of the battery cluster while improving the safety of the energy storage system.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sampling circuit of an energy storage system, characterized in that: The sampling circuit of the energy storage system includes a sampling module and an isolation module; The sampling module is connected to the battery cluster, and is also connected to the isolation module, and the isolation module is used to connect to the controller; the sampling module is also used to receive a control signal; The sampling module is used for collecting the output voltage of the battery cluster according to the control signal, and inputting the output voltage to the isolation module, so as to output the output voltage to the controller through the isolation module.

2. The sampling circuit of the energy storage system according to claim 1, characterized in that: The sampling module includes a control unit and a sampling unit; The control unit is connected to the sampling unit, the sampling unit is connected to the output end of the battery cluster, and the sampling unit is also used to connect to the isolation module; The control unit is used to receive a control signal and control the sampling unit to collect the output voltage of the battery cluster based on the control signal; The sampling unit is used to output the collected output voltage to the isolation module.

3. The sampling circuit of the energy storage system according to claim 2, characterized in that: The control unit includes a light MOS tube P1, a switch tube Q6, a resistor R93, a resistor R106 and a resistor R112; The first pin of the optical MOS tube P1 is connected to the first voltage through the resistor R93, the second pin of the optical MOS tube P1 is connected to the first end of the switch tube Q6, the control end of the switch tube Q6 is connected to the controller through the resistor R106, the control end of the switch tube Q6 is also connected to the ground through the resistor R112, the second end of the switch tube Q6 is used for grounding, and the optical MOS tube P1 is also connected to the sampling unit.

4. The sampling circuit of the energy storage system according to claim 3, characterized in that: The sampling unit includes a resistor R94, a resistor R95, a resistor R96, a resistor R97, a resistor R107, a resistor R108, a resistor R109, a resistor R110 and a resistor R111; The resistor R94 is connected to the sixth pin of the photo MOS tube P1, the resistor R94, the resistor R95, the resistor R96 and the resistor R97 are connected in series, the resistor R97 is also connected to the battery cluster, the resistor R107 is connected to the fourth pin of the photo MOS tube P1, the resistor R107, the resistor R108, the resistor R109 and the resistor R110 are connected in series, the resistor R110 is connected to the first end of the resistor R111, the first end of the resistor R111 is also connected to the isolation module, and the second end of the resistor R111 is used for grounding.

5. The sampling circuit of the energy storage system according to claim 1, characterized in that: The sampling circuit of the energy storage system also includes a conversion module; The conversion module performs SPI communication with the controller through the isolation module.

6. The sampling circuit of the energy storage system according to claim 5, characterized in that: The conversion module includes an analog-to-digital conversion chip U25, a resistor R168, a resistor R169, a resistor R170 and a resistor R171; The first pin of the analog-to-digital conversion chip U25 is connected to the isolation module through the resistor R168, the second pin of the analog-to-digital conversion chip U25 is connected to the isolation module through the resistor R170, the fourth pin of the analog-to-digital conversion chip U25 is connected to the sampling module, the ninth pin of the analog-to-digital conversion chip U25 is connected to the isolation module through the resistor R169, and the tenth pin of the analog-to-digital conversion chip U25 is connected to the isolation module through the resistor R171.

7. The sampling circuit of the energy storage system according to claim 6, characterized in that: The isolation module includes an isolation chip U24, a resistor R164, a resistor R165, a resistor R166, a resistor R167, a capacitor C115, a capacitor C118, a capacitor C119 and a capacitor C120; The third pin of the isolation chip U24 is connected to the second voltage through the resistor R165, the third pin of the isolation chip U24 is also grounded through the capacitor C118, the fourth pin of the isolation chip U24 is connected to the second voltage through the resistor R166, the fourth pin of the isolation chip U24 is also grounded through the capacitor C119, the fifth pin of the isolation chip U24 is connected to the second voltage through the resistor R167, the fourth pin of the isolation chip U24 is also grounded through the capacitor C120, and the third pin, fourth pin, fourth pin and sixth pin of the isolation chip U24 are all connected to the The controller is connected, the seventh pin of the isolation chip U24 is connected to the second voltage, the tenth pin of the isolation chip U24 is connected to the first voltage, the tenth pin of the isolation chip U24 is also grounded through the capacitor C115, the eleventh pin of the isolation chip U24 is connected to the ninth pin of the analog-to-digital conversion chip U25, the twelfth pin of the isolation chip U24 is connected to the tenth pin of the analog-to-digital conversion chip U25, the thirteenth pin of the isolation chip U24 is connected to the second pin of the analog-to-digital conversion chip U25, and the fourteenth pin of the isolation chip U24 is connected to the first pin of the analog-to-digital conversion chip U25.

8. The sampling circuit of the energy storage system according to claim 1, characterized in that: The sampling circuit of the energy storage system also includes a voltage follower module; The voltage follower module is connected to the sampling module and the isolation module respectively; The voltage follower module is used for receiving the output voltage and outputting the output voltage to the isolation module.

9. The sampling circuit of the energy storage system according to claim 8, characterized in that: The voltage follower module includes a dual-channel operational amplifier U22, a resistor R145, a resistor R143, a capacitor C110 and a capacitor C108; The third pin of the dual-channel operational amplifier U22 is connected to the sampling module through the resistor R145, and the third pin of the dual-channel operational amplifier U22 is also grounded through the capacitor C110. The second pin of the dual-channel operational amplifier U22 is connected to the first pin of the dual-channel operational amplifier U22, and the first pin of the dual-channel operational amplifier U22 is connected to the isolation module through the resistor R143, and the first pin of the dual-channel operational amplifier U22 is also grounded through the capacitor C108.

10. An energy storage system, characterized in that: The energy storage system comprises: Controller; A battery cluster, wherein the battery cluster includes at least two battery cells; and A sampling circuit for an energy storage system as claimed in any one of claims 1 to 9.

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