Insulation detection device for energy storage system

Abstract

The utility model discloses an insulation detection device for an energy storage system, which comprises a bridge measuring circuit, a temperature and humidity detection circuit, a water immersion detection circuit, a first communication interface circuit and a main control module, the output ends of the bridge measurement circuit, the temperature and humidity detection circuit and the water immersion detection circuit are all connected with the input end of the main control module, the first communication interface circuit is connected with the main control module, and the first communication interface circuit is further connected with a cell stack management unit of an energy storage system. According to the utility model, the first communication interface circuit receives the insulation detection instruction from the cell stack management unit of the energy storage system and feeds back the detection result, and multiple sets of insulation detection devices are not needed, so that the system cost is reduced, and the temperature, humidity, water immersion and other information in the warehouse level can be detected, thereby improving the safety of the system and improving the reliability of the system. The utility model can be widely applied to the technical field of lithium batteries.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to an insulation detection device for energy storage systems. Background Technology

[0002] With the development of green energy, lithium battery technology is increasingly being used in industry and commerce for energy storage, peak shaving, and valley filling. To save on wiring and reduce engineering costs, the voltage level of energy storage systems is far higher than the safe operating voltage, which brings with it various safety hazards. Therefore, it is necessary to add an insulation resistance monitoring system to energy storage systems, which can periodically perform dynamic insulation resistance testing to improve system safety. Currently, insulation resistance detection in energy storage systems is mostly integrated into the cluster controller. When multiple clusters are used in parallel, there are issues such as redundant configuration, mutual interference during detection, and limited functionality. Utility Model Content

[0003] To solve the above-mentioned technical problems, the purpose of this utility model is to provide an insulation detection device for energy storage systems, which can improve the safety of energy storage systems.

[0004] The technical solution adopted by this utility model is:

[0005] An insulation detection device for an energy storage system includes a bridge measurement circuit, a temperature and humidity detection circuit, a water immersion detection circuit, a first communication interface circuit, and a main control module. The output terminals of the bridge measurement circuit, the temperature and humidity detection circuit, and the water immersion detection circuit are all connected to the input terminal of the main control module. The first communication interface circuit is connected to the main control module and is also connected to the battery stack management unit of the energy storage system.

[0006] Furthermore, the insulation detection device also includes a door lock control and feedback module, the output of which is connected to the input of the main control module.

[0007] Furthermore, the insulation detection device also includes a second communication interface module, the input terminal of which is connected to the output terminal of the temperature and humidity detection circuit, and the output terminal of which is connected to the first input terminal of the main control module.

[0008] Furthermore, the insulation detection device also includes a digital input module, the input terminal of which is connected to the output terminal of the water immersion detection circuit, and the output terminal of which is connected to the second input terminal of the main control module.

[0009] Furthermore, the insulation detection device also includes a digital input and output module, the input terminal of which is connected to the output terminal of the door lock control and feedback module, and the output terminal of which is connected to the third input terminal of the main control module.

[0010] Furthermore, the first communication interface circuit includes a driver chip, a filter, a voltage regulator module, a first interference suppression module, and a second interference suppression module. The filter, the voltage regulator module, and the first interference suppression module are all connected to the driver chip, and the filter and the battery stack management unit are all connected to the second interference suppression module.

[0011] Furthermore, the bridge measurement circuit includes a first switch, a second switch, a third switch, a first insulation resistance, a second insulation resistance, a first detection resistor, a second detection resistor, a third detection resistor, and a fourth detection resistor. One end of the first detection resistor is connected to the positive terminal of the energy storage system through the first switch. The other end of the first detection resistor is connected to one end of the second detection resistor. The other end of the second detection resistor is connected to one end of the fourth detection resistor. The other end of the fourth detection resistor is connected to one end of the third detection resistor. The other end of the third detection resistor is connected to the negative terminal of the energy storage system through the second switch. One end of the first insulation resistor is connected between the positive terminal of the energy storage system and the first switch. The other end of the first insulation resistor is connected to one end of the second insulation resistor. The other end of the second insulation resistor is connected between the negative terminal of the energy storage system and the second switch. One end of the third switch is connected between the first insulation resistor and the second insulation resistor. The other end of the third switch is grounded.

[0012] Furthermore, the temperature and humidity detection circuit includes a temperature and humidity sensor, a first resistor, a second resistor, and a first capacitor. The first pin of the temperature and humidity sensor is connected to one end of the first resistor, and the second pin of the temperature and humidity sensor is connected to one end of the second resistor. The other ends of the first resistor and the second resistor are both connected to a first power input terminal. The first pin and the second pin of the temperature and humidity sensor are also connected to the second communication interface module. The third pin of the temperature and humidity sensor is connected to the first power input terminal, and the fourth pin of the temperature and humidity sensor is grounded. The first capacitor is connected between the third pin and the fourth pin of the temperature and humidity sensor.

[0013] Furthermore, the water immersion detection circuit includes an optocoupler, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor. The first pin of the optocoupler is connected to the digital input module through the third and fourth resistors. The second pin of the optocoupler is connected to the second power input terminal. One end of the second capacitor is connected between the third and fourth resistors, and the other end of the second capacitor is connected to the second power input terminal. One end of the fifth resistor and one end of the third capacitor are both connected between the first pin of the optocoupler and the fourth resistor. The other ends of the five resistors and the third capacitor are both connected between the second pin of the optocoupler and the second power input terminal. The third pin of the optocoupler is connected to the digital input module through the sixth resistor. One end of the seventh resistor is connected between the third pin of the optocoupler and the sixth resistor, and the other end of the seventh resistor is connected to the digital input module through the fifth capacitor. One end of the fourth capacitor is connected between the third pin of the optocoupler and the sixth resistor, and the other end of the fourth capacitor is connected between the seventh resistor and the fifth capacitor. The fourth pin of the optocoupler is connected to the first power input terminal.

[0014] Furthermore, the second interference suppression module includes a first diode, a second diode, a third diode, an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor. The first pin of the filter is connected to the battery stack management unit through the eighth resistor, and the second pin of the filter is connected to the battery stack management unit through the ninth resistor. One end of the first diode is connected between the first pin of the filter and the eighth resistor, and the other end of the first diode is connected to the third power input terminal. One end of the third diode is connected between the second pin of the filter and the ninth resistor, and the other end of the third diode is connected to the third power input terminal. One end of the second diode is connected between the first pin of the filter and the eighth resistor, and the other end of the second diode is connected between the second pin of the filter and the ninth resistor. One end of the tenth resistor is connected to one end of the second diode, and the other end of the tenth resistor is connected between the first diode and the third power input terminal. One end of the eleventh resistor is connected to one end of the second diode, and the other end of the eleventh resistor is connected to the fourth power input terminal.

[0015] The beneficial effects of this utility model are as follows: It includes a bridge measurement circuit, a temperature and humidity detection circuit, a water immersion detection circuit, a first communication interface circuit, and a main control module. The first communication interface circuit receives insulation detection commands from the battery stack management unit. The bridge measurement circuit measures the insulation resistance of the energy storage system according to the insulation detection commands. The temperature and humidity detection circuit and the water immersion detection circuit collect temperature, humidity, and water immersion signals inside the storage compartment. The main control module determines the health status of the energy storage system based on the collected temperature, humidity, and water immersion signals. Finally, the first communication interface circuit feeds back the insulation detection results and the health status of the energy storage system to the battery stack management unit. This utility model, on the one hand, communicates through the first communication interface circuit, receiving insulation detection commands from the battery stack management unit of the energy storage system and feeding back the detection results, eliminating the need for multiple insulation detection devices and thus reducing system costs. On the other hand, it can detect temperature, humidity, and water immersion information inside the storage compartment, thereby improving system safety. Attached Figure Description

[0016] Figure 1 A structural block diagram of an insulation detection device for an energy storage system provided by this utility model;

[0017] Figure 2 A schematic diagram showing the connection between the insulation detection device and the energy storage system provided by this utility model;

[0018] Figure 3 Structural block diagram of the first communication interface circuit provided by this utility model;

[0019] Figure 4 A circuit schematic diagram of the first communication interface circuit provided by this utility model;

[0020] Figure 5 The circuit diagram of the bridge measurement circuit provided by this utility model;

[0021] Figure 6 The circuit diagram of the temperature and humidity detection circuit provided by this utility model;

[0022] Figure 7 The circuit diagram of the water immersion detection circuit provided by this utility model.

[0023] Reference numerals: U1, temperature and humidity sensor; U2, driver chip; PU1, optocoupler; A1, filter; V1, Zener diode; D1-D3, first to third diodes; K1-K3, first to third switches; R1m, first sensing resistor; R1n, second sensing resistor; R2n, third sensing resistor; R2m, fourth sensing resistor; Rx, first insulation resistance; Ry, second insulation resistance; R1-R11, first to eleventh resistors; C1-C6, first to sixth capacitors; C10, first decoupling capacitor; C11, second decoupling capacitor; VCC1, first power input terminal; VCC2, second power input terminal; VCC3, third power input terminal; VCC4, fourth power input terminal. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] With the development of green energy, lithium battery technology is increasingly being used in industry and commerce for energy storage, peak shaving, and valley filling. To save on wiring and reduce engineering costs, the voltage level of energy storage systems is far higher than the safe operating voltage, which brings with it various safety hazards. Therefore, it is necessary to add an insulation resistance monitoring system to energy storage systems, which can periodically perform dynamic insulation resistance testing to improve system safety. Currently, insulation resistance detection in energy storage systems is mostly integrated into the cluster controller. When multiple clusters are used in parallel, there are issues such as redundant configuration, mutual interference during detection, and limited functionality.

[0026] To address this issue, this invention proposes an insulation detection device for energy storage systems, comprising a bridge measurement circuit, a temperature and humidity detection circuit, a water immersion detection circuit, a first communication interface circuit, and a main control module. The device receives insulation detection commands from the battery stack management unit via the first communication interface circuit. The bridge measurement circuit measures the insulation resistance of the energy storage system according to the insulation detection commands. The temperature and humidity detection circuit and the water immersion detection circuit collect temperature, humidity, and water immersion signals within the storage compartment. The main control module determines the health status of the energy storage system based on the collected temperature, humidity, and water immersion signals. Finally, the first communication interface circuit feeds back the insulation detection results and the energy storage system health status to the battery stack management unit. This invention, on the one hand, uses the first communication interface circuit for communication, receiving insulation detection commands from the battery stack management unit of the energy storage system and feeding back the detection results, eliminating the need for multiple insulation detection devices and thus reducing system costs; on the other hand, it can detect temperature, humidity, and water immersion information within the storage compartment, thereby improving system safety.

[0027] Reference Figure 1 and Figure 2 , Figure 1 This is a structural block diagram of an insulation testing device for an energy storage system. Figure 2 This is a schematic diagram showing the connection between an insulation testing device and an energy storage system. An insulation testing device for an energy storage system includes a bridge measurement circuit, a temperature and humidity detection circuit, a water immersion detection circuit, a first communication interface circuit, and a main control module. The output terminals of the bridge measurement circuit, the temperature and humidity detection circuit, and the water immersion detection circuit are all connected to the input terminal of the main control module. The first communication interface circuit is connected to the main control module and is also connected to the battery stack management unit of the energy storage system.

[0028] Specifically, the first communication interface circuit is used to receive various instructions from the battery stack management unit (such as insulation detection instructions, temperature and humidity query instructions, and switch control instructions, etc.), identify the corresponding function codes, and feed back the insulation detection results and energy storage system health status to the battery stack management unit.

[0029] The bridge measurement circuit is used to measure the positive-to-ground voltage and negative-to-ground voltage of the energy storage system according to the insulation detection command, and then send the measured voltage to the ADC acquisition port of the main control module after proportionally reducing the voltage.

[0030] Temperature and humidity detection circuit and water immersion detection circuit are used to collect temperature, humidity and water immersion signals inside the warehouse and feed back the collection results to the main control module.

[0031] The main control module is used to calculate the restored voltage value based on the step-down voltage fed back by the bridge measurement circuit, and is also used to determine the health status of the energy storage system based on the collected temperature, humidity and water immersion signals.

[0032] It should be noted that this utility model communicates with the battery stack management unit of the energy storage system through the first communication interface circuit. The battery stack management unit is connected to the battery cluster control management unit (BCU) and the battery management unit (BMU). It is connected to the positive and negative terminals of the battery module (PACK) through the bridge measurement circuit. Therefore, an energy storage system only needs one insulation detection device to realize insulation resistance detection.

[0033] Reference Figure 1 As an optional implementation, the insulation detection device also includes a door lock control and feedback module, the output of which is connected to the input of the main control module.

[0034] Specifically, the insulation detection device is used to collect the door lock signal at the warehouse level. The door lock microcontroller drives the relay for control. Normally, it is in the open state. When the relay is closed, the door lock will be unlocked, and the door can be opened. The door lock switch integrates open and closed status feedback signals. The main control module can identify the current door status through this status feedback signal.

[0035] It should be noted that energy storage systems are flammable devices and generally can only be installed outdoors. Due to varying operating conditions, they are susceptible to leaks, exposure to direct sunlight, and vandalism. Therefore, the storage unit is equipped with temperature and humidity sensors, water immersion sensors, and detection devices for unauthorized opening. These devices provide early warning and protection; when an anomaly is detected, the system can be shut down to protect personnel and property.

[0036] Reference Figure 1 As an optional implementation, the insulation detection device further includes a second communication interface module, the input of which is connected to the output of the temperature and humidity detection circuit, and the output of which is connected to the first input of the main control module.

[0037] Specifically, the second communication interface module is used to enable communication between the temperature and humidity detection circuit and the main control module, and to feed back the temperature and humidity signals collected by the temperature and humidity detection circuit to the main control module. This second communication interface module can use an IIC communication port, but is not limited to this.

[0038] Reference Figure 1 As an optional implementation, the insulation detection device further includes a digital input module, the input terminal of which is connected to the output terminal of the water immersion detection circuit, and the output terminal of which is connected to the second input terminal of the main control module.

[0039] Specifically, the digital input module is used to transmit the water immersion signal collected by the water immersion detection circuit to the main control module.

[0040] Reference Figure 1As an optional implementation, the insulation detection device further includes a digital input and output module, the input terminal of which is connected to the output terminal of the door lock control and feedback module, and the output terminal of which is connected to the third input terminal of the main control module.

[0041] Specifically, the digital input and output module is used to transmit the status feedback signal of the door lock switch collected by the door lock control and feedback module to the main control module.

[0042] Reference Figure 3 , Figure 3 The diagram shows the structure of the first communication interface circuit. As an optional implementation, the first communication interface circuit includes a driver chip U2, a filter A1, a voltage regulator module, a first interference suppression module, and a second interference suppression module. The filter A1, the voltage regulator module, and the first interference suppression module are all connected to the driver chip U2, and the filter A1 and the battery stack management unit are all connected to the second interference suppression module.

[0043] Reference Figure 4 , Figure 4 The circuit schematic of the first communication interface circuit is shown below. As an optional implementation, the second interference suppression module includes a first diode D1, a second diode D2, a third diode D3, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11. The first pin of filter A1 is connected to the battery stack management unit via the eighth resistor R8, and the second pin of filter A1 is connected to the battery stack management unit via the ninth resistor R9. One end of the first diode D1 is connected between the first pin of filter A1 and the eighth resistor R8, and the other end of the first diode D1 is connected to the third power input terminal VCC3. One end of the third diode D3 is connected to... Between the second pin of filter A1 and the ninth resistor R9, the other end of the third diode D3 is connected to the third power input terminal VCC3. One end of the second diode D2 is connected between the first pin of filter A1 and the eighth resistor R8, and the other end of the second diode D2 is connected between the second pin of filter A1 and the ninth resistor R9. One end of the tenth resistor R10 is connected to one end of the second diode D2, and the other end of the tenth resistor R10 is connected between the first diode D1 and the third power input terminal VCC3. One end of the eleventh resistor R11 is connected to one end of the second diode D2, and the other end of the eleventh resistor R11 is connected to the fourth power input terminal VCC4.

[0044] Specifically, such as Figure 4 As shown, the driver chip U2 is an isolated RS485 driver chip. Its left side is the input side, which communicates with the UART port of the main control module, and its right side is the output port, which is connected to the RS485 bus through filter A1 and surge suppressor.

[0045] The first interference suppression module includes a first decoupling capacitor C10 and a second decoupling capacitor C11, which are used to suppress interference signals from the power supply.

[0046] The voltage regulator module includes a Zener diode V1 and a sixth capacitor C6. The Zener diode V1 is used to keep the power supply of the driver chip U2 below 5.5V to ensure that the chip is not burned out.

[0047] The second interference suppression module includes a first diode D1, a second diode D2, a third diode D3, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11. Among them, the first diode D1, the second diode D2, and the third diode D3 are transient voltage suppressor diodes (TVS diodes) used to suppress surge interference signals from the bus and protect the circuit from breakdown. The eighth resistor R8 and the ninth resistor R9 are thermistors. When the surge voltage in the circuit is particularly high and the frequency is dense, the transient voltage suppressor diodes suppress excessive current, which will cause the eighth resistor R8 and the ninth resistor R9 to temporarily disconnect the circuit, protecting the safety of the driver chip U2. After the surge disappears, the eighth resistor R8 and the ninth resistor R9 return to normal. The tenth resistor R10 and the eleventh resistor R11 are used to improve the bus driving capability.

[0048] Filter A1 is used to filter out interference signals on the RS485 bus and reduce the packet loss rate.

[0049] Reference Figure 5 , Figure 5 The circuit diagram shows the schematic of a bridge measurement circuit. As an optional implementation, the bridge measurement circuit includes a first switch K1, a second switch K2, a third switch K3, a first insulation resistance Rx, a second insulation resistance Ry, a first detection resistor R1m, a second detection resistor R1n, a third detection resistor R2n, and a fourth detection resistor R2m. One end of the first detection resistor R1m is connected to the positive terminal of the energy storage system through the first switch K1. The other end of the first detection resistor R1m is connected to one end of the second detection resistor R1n, and the other end of the second detection resistor R1n is connected to one end of the fourth detection resistor R2m. The first insulation resistor Rx is connected to the positive terminal of the energy storage system and the first switch K1. The other end of the first insulation resistor Rx is connected to one end of the second insulation resistor Ry. The other end of the second insulation resistor Ry is connected to the negative terminal of the energy storage system and the second switch K2. One end of the third switch K3 is connected between the first insulation resistor Rx and the second insulation resistor Ry. The other end of the third switch K3 is grounded.

[0050] Specifically, in the energy storage system, the positive terminal, negative terminal, and ground wire of the battery module are connected to the bridge measurement circuit through wires. The voltage of the positive terminal to ground and the voltage of the negative terminal to ground are measured by internal relays. The bridge measurement circuit reduces this voltage proportionally and sends it to the ADC acquisition port of the main control module, and the ADC calculates and restores the voltage value.

[0051] When the first switch K1 is closed, the current flows back to the negative terminal of the battery through the first detection resistor R1m, the second detection resistor R1n, and the second insulation resistor Ry. At this time, a voltage drop will be formed across the second detection resistor R1n, and the voltage drop ratio is shown in the following formula:

[0052]

[0053] When the second switch K2 is closed, the current flows back to the negative terminal of the battery through the first insulation resistor Rx, the third detection resistor R2n, and the fourth detection resistor R2m. At this time, a voltage drop will be formed across the third detection resistor R2n, and the voltage drop ratio is shown in the following formula:

[0054]

[0055] Therefore, the first detection resistor R1 and the third detection resistor R2 are set as known resistors. When measurement is required, the third switch K3 is closed by the main control module to connect the ground wire to the system, and the measurement is performed in the following order.

[0056] A. Close the third switch K3, open the first switch K1, open the second switch K2, and measure the voltages Ux and Uy, which are U1x and U1y respectively;

[0057] B. Close the third switch K3, open the first switch K1, close the second switch K2, and measure the voltages of Ux and Uy, which are U2x and U2y respectively.

[0058] C. Close the third switch K3, close the first switch K1, open the second switch K2, and measure the voltages Ux and Uy, which are U3x and U3y respectively.

[0059] Next, the main control module calculates the positive insulation resistance (i.e., the first insulation resistance Rx) and the negative insulation resistance (i.e., the first insulation resistance Ry) according to the following formula:

[0060]

[0061] Disconnecting the third switch K3 will prevent the system from performing insulation resistance testing.

[0062] Reference Figure 6 , Figure 6The circuit diagram shows the temperature and humidity detection circuit. As an optional implementation, the temperature and humidity detection circuit includes a temperature and humidity sensor U1, a first resistor R1, a second resistor R2, and a first capacitor C1. The first pin of the temperature and humidity sensor U1 is connected to one end of the first resistor R1, and the second pin of the temperature and humidity sensor U1 is connected to one end of the second resistor R2. The other ends of the first resistor R1 and the second resistor R2 are both connected to the first power input terminal VCC1. The first pin and the second pin of the temperature and humidity sensor U1 are also connected to the second communication interface module. The third pin of the temperature and humidity sensor U1 is connected to the first power input terminal VCC1, and the fourth pin of the temperature and humidity sensor U1 is grounded. The first capacitor C1 is connected between the third pin and the fourth pin of the temperature and humidity sensor U1.

[0063] Specifically, the temperature and humidity sensor U1 is used to collect the temperature and humidity information of the current environment and then transmit the temperature and humidity information to the main control module through the IIC interface pins AHT20-SCL and AHT20-SDA.

[0064] The first capacitor C1 is a decoupling capacitor used to suppress interference noise signals in the circuit;

[0065] The first resistor R1 and the second resistor R2 are pull-up resistors, used to ensure that the IIC pin is at a high level regardless of whether there is data transmission or reception.

[0066] Reference Figure 7 , Figure 7The circuit diagram shows the water immersion detection circuit. As an optional implementation, the water immersion detection circuit includes an optocoupler PU1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5. The first pin of the optocoupler PU1 is connected to the digital input module through the third resistor R3 and the fourth resistor R4. The second pin of the optocoupler PU1 is connected to the second power input terminal VCC2. One end of the second capacitor C2 is connected between the third resistor R3 and the fourth resistor R4, and the other end of the second capacitor C2 is connected to the second power input terminal VCC2. One end of the fifth resistor R5 and one end of the third capacitor C3 are both connected to the optocoupler. The first pin of PU1 is connected to the fourth resistor R4, and the other end of the fifth resistor R5 and the third capacitor C3 are connected to the second pin of optocoupler PU1 and the second power input terminal VCC2. The third pin of optocoupler PU1 is connected to the digital input module through the sixth resistor R6. One end of the seventh resistor R7 is connected between the third pin of optocoupler PU1 and the sixth resistor R6, and the other end of the seventh resistor R7 is connected to the digital input module through the fifth capacitor C5. One end of the fourth capacitor C4 is connected between the third pin of optocoupler PU1 and the sixth resistor R6, and the other end of the fourth capacitor C4 is connected between the seventh resistor R7 and the fifth capacitor C5. The fourth pin of optocoupler PU1 is connected to the first power input terminal VCC1.

[0067] Specifically, the third resistor R3 and the fourth resistor R4 are limiting resistors used to limit the current of the optocoupler PU1.

[0068] The fifth resistor, R5, is a voltage divider resistor for the optical coupling input of optocoupler PU1, used to reduce the input sensitivity of optocoupler PU1.

[0069] The second capacitor C2 and the third capacitor C3 are input filter capacitors used to suppress interference signals from the input port and prevent false triggering.

[0070] When the optocoupler PU1 has an input, the 3.3V voltage is sent to the main control module for identification through the internal transistor. The sixth resistor R6, the seventh resistor R7, the fourth capacitor C4, and the fifth capacitor C5 form a low-pass filter to further suppress interference signals. At the same time, the input port of the main control module is current-limited to prevent a high electrostatic interference signal from being input to the interface of the main control module and causing system damage.

[0071] The above description explains the structure and working principle of the insulation testing device for energy storage systems of this utility model. It can be recognized that, compared with existing insulation resistance testing devices, this utility model has the following advantages:

[0072] First, communication is conducted through the first communication interface circuit to receive insulation detection commands from the battery stack management unit of the energy storage system and return the detection results, eliminating the need to configure multiple insulation detection devices, thereby reducing system costs;

[0073] Second, it integrates temperature and humidity detection circuits, water immersion detection circuits, and door lock control and feedback modules, which can detect information such as temperature, humidity, water immersion, and door lock opening / closing inside the warehouse, thereby improving the security of the system.

[0074] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0075] In this utility model, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An insulation testing device for an energy storage system, characterized in that: It includes a bridge measurement circuit, a temperature and humidity detection circuit, a water immersion detection circuit, a first communication interface circuit, and a main control module. The output terminals of the bridge measurement circuit, the temperature and humidity detection circuit, and the water immersion detection circuit are all connected to the input terminal of the main control module. The first communication interface circuit is connected to the main control module and is also connected to the battery stack management unit of the energy storage system.

2. The insulation detection device for an energy storage system according to claim 1, characterized in that: The insulation detection device also includes a door lock control and feedback module, the output of which is connected to the input of the main control module.

3. The insulation detection device for an energy storage system according to claim 1, characterized in that: The insulation detection device further includes a second communication interface module. The input terminal of the second communication interface module is connected to the output terminal of the temperature and humidity detection circuit, and the output terminal of the second communication interface module is connected to the first input terminal of the main control module.

4. An insulation testing device for an energy storage system according to claim 1, characterized in that: The insulation detection device also includes a digital input module, the input terminal of which is connected to the output terminal of the water immersion detection circuit, and the output terminal of which is connected to the second input terminal of the main control module.

5. An insulation testing device for an energy storage system according to claim 2, characterized in that: The insulation detection device also includes a digital input and output module. The input terminal of the digital input and output module is connected to the output terminal of the door lock control and feedback module, and the output terminal of the digital input and output module is connected to the third input terminal of the main control module.

6. An insulation testing device for an energy storage system according to claim 1, characterized in that: The first communication interface circuit includes a driver chip, a filter, a voltage regulator module, a first interference suppression module, and a second interference suppression module. The filter, the voltage regulator module, and the first interference suppression module are all connected to the driver chip, and the filter and the battery stack management unit are all connected to the second interference suppression module.

7. An insulation testing device for an energy storage system according to claim 1, characterized in that: The bridge measurement circuit includes a first switch, a second switch, a third switch, a first insulation resistance, a second insulation resistance, a first detection resistor, a second detection resistor, a third detection resistor, and a fourth detection resistor. One end of the first detection resistor is connected to the positive terminal of the energy storage system through the first switch. The other end of the first detection resistor is connected to one end of the second detection resistor. The other end of the second detection resistor is connected to one end of the fourth detection resistor. The other end of the fourth detection resistor is connected to one end of the third detection resistor. The other end of the third detection resistor is connected to the negative terminal of the energy storage system through the second switch. One end of the first insulation resistor is connected between the positive terminal of the energy storage system and the first switch. The other end of the first insulation resistor is connected to one end of the second insulation resistor. The other end of the second insulation resistor is connected between the negative terminal of the energy storage system and the second switch. One end of the third switch is connected between the first insulation resistor and the second insulation resistor. The other end of the third switch is grounded.

8. An insulation testing device for an energy storage system according to claim 3, characterized in that: The temperature and humidity detection circuit includes a temperature and humidity sensor, a first resistor, a second resistor, and a first capacitor. The first pin of the temperature and humidity sensor is connected to one end of the first resistor, and the second pin of the temperature and humidity sensor is connected to one end of the second resistor. The other ends of the first resistor and the second resistor are both connected to a first power input terminal. The first pin and the second pin of the temperature and humidity sensor are also connected to a second communication interface module. The third pin of the temperature and humidity sensor is connected to the first power input terminal, and the fourth pin of the temperature and humidity sensor is grounded. The first capacitor is connected between the third pin and the fourth pin of the temperature and humidity sensor.

9. An insulation testing device for an energy storage system according to claim 4, characterized in that: The water immersion detection circuit includes an optocoupler, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor. The first pin of the optocoupler is connected to the digital input module through the third and fourth resistors. The second pin of the optocoupler is connected to a second power input terminal. One end of the second capacitor is connected between the third and fourth resistors, and the other end of the second capacitor is connected to the second power input terminal. One end of both the fifth resistor and the third capacitor is connected between the first pin of the optocoupler and the fourth resistor, and the other end of both the fifth resistor and the third capacitor is connected between the second pin of the optocoupler and the second power input terminal. The third pin of the optocoupler is connected to the digital input module through the sixth resistor. One end of the seventh resistor is connected between the third pin of the optocoupler and the sixth resistor, and the other end of the seventh resistor is connected to the digital input module through the fifth capacitor. One end of the fourth capacitor is connected between the third pin of the optocoupler and the sixth resistor, and the other end of the fourth capacitor is connected between the seventh resistor and the fifth capacitor. The fourth pin of the optocoupler is connected to a first power input terminal.

10. An insulation detection device for an energy storage system according to claim 6, characterized in that: The second interference suppression module includes a first diode, a second diode, a third diode, an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor. The first pin of the filter is connected to the battery stack management unit via the eighth resistor. The second pin of the filter is connected to the battery stack management unit via the ninth resistor. One end of the first diode is connected between the first pin of the filter and the eighth resistor, and the other end of the first diode is connected to a third power input terminal. One end of the third diode is connected between the second pin of the filter and the ninth resistor, and the other end of the third diode is connected to the third power input terminal. One end of the second diode is connected between the first pin of the filter and the eighth resistor, and the other end of the second diode is connected between the second pin of the filter and the ninth resistor. One end of the tenth resistor is connected to one end of the second diode, and the other end of the tenth resistor is connected between the first diode and the third power input terminal. One end of the eleventh resistor is connected to one end of the second diode, and the other end of the eleventh resistor is connected to a fourth power input terminal.

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