High-voltage protection system suitable for incubator

Abstract

The invention provides a high-voltage protection system suitable for an incubator. The high-voltage protection system comprises the incubator, a door state detection unit, a direct-current low-voltage control power supply and a unified control loop, wherein a high-voltage test branch loop is formed between a battery pack and a high-voltage charging and discharging power supply; the test branch loops are mutually independent and are connected in series with corresponding normally-closed on-off devices; the door state detection unit is arranged on the incubator door and detects the opening and closing states of the door; when the incubator door is opened, the door state detection unit is triggered, and the control loop synchronously drives all the normally-closed on-off devices to be converted from the normally-closed state to the off state according to a trigger signal of the door state detection unit, so that all the high-voltage test branch loops are physically cut off at a time. According to the invention, through multi-branch high-voltage linkage control of the inductive switch and the relay, the technical problems of lack of unified safety control, complex operation, insufficient expansibility and weak monitoring capability in a multi-battery pack test in the incubator are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of battery temperature chamber technology, and more particularly to a high-voltage protection system suitable for temperature chambers. Background Technology

[0002] A battery chamber is a device specifically designed to control and regulate the testing or storage environment of batteries. It is widely used in the research, development, testing, and verification of power batteries, energy storage batteries, and consumer electronics batteries. With the continuous advancement of battery technology, battery chambers are also constantly evolving. Especially after the commercial application of lithium-ion batteries, the rapid development of new energy vehicles and energy storage systems has placed higher demands on the evaluation of battery performance, safety, and lifespan under different temperature environments.

[0003] As high-power electrical equipment, battery incubators integrate multiple live components such as heaters, compressors, fans, and electrical control systems. Although the equipment casing has good grounding and insulation protection during normal use, there is still a certain risk of electric shock during door opening operations, especially during equipment maintenance, troubleshooting, or non-standard operation. Most battery incubators currently use 380V three-phase power supply. While this voltage level falls within the low-voltage category (below 1000V AC) as defined by national standards, it is significantly higher than the 220V commonly used in households. If personnel accidentally touch live components, the consequences will be more severe. However, compared to the risk posed by the 380V electrical components within the incubator itself, the greater source of electric shock hazard lies in the battery packs being tested inside and their related testing fixtures. During charging, discharging, and performance testing, the battery packs are typically powered by a high-voltage DC charging / discharging power supply, with voltages reaching hundreds of volts or even higher. At this time, the battery terminals, connecting harnesses, clamps, and testing fixtures may all carry high-voltage DC current. If an operator opens the incubator door during testing and accidentally touches these live components, severe electric shock is highly likely. Furthermore, some large-capacity capacitors in the test circuit may still retain high voltage after power is cut off, increasing the risk of accidental electric shock. Therefore, the risk of electric shock from the battery temperature chamber comes not only from the equipment's own 380V power supply system, but more importantly from the high-voltage DC current carried by the battery pack and its testing fixtures during testing. This risk increases significantly when the chamber door is open, the test is not interrupted, or the residual voltage is not released, making it one of the most important safety hazards to be aware of and prevent during battery testing.

[0004] Existing incubators mostly adopt a single power switch or single - circuit power - off measure, which usually can only cut off the 380V power supply of the device itself, but cannot perform linkage isolation on the high - voltage direct current carried by the battery pack during the test process. During the charging, discharging and performance testing of the battery pack, the battery pack, its connection tooling and wiring harness may all be in a high - voltage state of hundreds of volts or even higher. Once the incubator door is opened without stopping the test, it is very likely that the operator will accidentally touch the charged parts such as the battery terminal posts, connection terminals or clamps, and the risk of electric shock is much higher than the danger brought by the electrical components of the incubator itself. This design defect of lacking linkage isolation for the high - voltage battery - pack test makes the existing incubators have serious potential safety hazards of electric shock to personnel during maintenance, abnormal handling or non - standard operations. Moreover, multi - branch testing often requires independent configuration of switches or disconnecting devices, which is cumbersome to operate and prone to misoperation, increasing the risk of use. When the number of battery packs to be tested needs to be increased or decreased during the test, the existing system needs to make major modifications to the control circuit, with high modification costs and affecting system stability. And most solutions lack real - time monitoring of the states of each branch and the actions of relays, making it difficult to detect and handle faults in a timely manner, and there are potential hazards of equipment damage and test interruption. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and provide a protection system that can effectively perform linkage isolation on the high - voltage battery - pack test.

[0006] To achieve the above purpose, the present invention proposes a high - voltage protection system applicable to an incubator, including an incubator, a door - state detection unit, a DC low - voltage control power supply, and a unified control circuit: At least one battery pack to be tested is disposed inside the box body of the incubator; a high - voltage test branch circuit is formed between each battery pack to be tested and the corresponding high - voltage charge - discharge power supply; Each high - voltage test branch circuit is independent of each other, and a group of normally - closed on - off devices are connected in series to each; The door - state detection unit is disposed on the incubator door to detect the opening and closing state of the door; The unified control circuit receives the trigger signal from the door - state detection unit, and in response to this trigger signal, synchronously distributes the output of the DC low - voltage control power supply to the control ends of all normally - closed on - off devices to drive their synchronous actions; When the incubator door is opened, the door - state detection unit is triggered, and the output current of the DC low - voltage control power supply flows through the unified control circuit, synchronously driving all normally - closed on - off devices to act, so that the normally - closed on - off devices are converted from the normally - closed state to the open state, thereby physically cutting off all high - voltage test branch circuits at one time.

[0007] Furthermore, the door status detection unit is a normally open inductive switch: when the temperature chamber door is closed, the inductive switch is in the open state, blocking the unified control loop; when the temperature chamber door is opened, the inductive switch switches to the closed state, connecting the unified control loop.

[0008] Furthermore, the normally open inductive switch is a magnetic induction type or a mechanical normally open switch.

[0009] Furthermore, the normally closed switching device is a normally closed relay or a normally closed contactor.

[0010] Furthermore, the unified control loop includes a PLC controller, which acts as a wire connector in the unified control loop, providing an electrical connection and parallel distribution path between the output terminal of the door status detection unit and the control terminals of all normally closed on / off devices; at the same time, the PLC controller also acts as a status detector, used to detect the working status of the door status detection unit and all normally closed on / off devices.

[0011] Furthermore, the DC low-voltage control power supply is provided by the control power generation module; The control power generation module includes an air switch and a transformer: the input terminal of the air switch is connected to an external AC power source, and the output terminal is connected to the input terminal of the transformer; the transformer is used to step down the external AC power source and output a low-voltage DC control power source.

[0012] Furthermore, the control power generation module includes two or more independent redundant power modules; the positive terminals of each redundant power module are connected in parallel and then connected to the unified control loop, while their negative terminals are independently connected to the control terminal of the normally closed switching device that it is responsible for powering.

[0013] Furthermore, the control terminals of all normally closed switching devices are connected in parallel to the same output node of the unified control loop; the number of high-voltage test branch circuits corresponds to the number of normally closed switching devices, and each high-voltage test branch circuit and its corresponding normally closed switching device constitute a test branch that can be operated and maintained independently.

[0014] Furthermore, the high-voltage protection system also includes a host computer, which is communicatively connected to the PLC controller and the high-voltage charging and discharging power supply to form a monitoring system. This system is used to monitor the voltage and current of the battery pack under test, and also to monitor and judge the safety parameters of the temperature chamber door status and relay operation in real time through the PLC controller signal, and issue an alarm when the status is abnormal.

[0015] Furthermore, the DC low-voltage control power supply is provided by a control power generation module; the control power generation module includes an air switch and a transformer: the input terminal of the air switch is connected to an external AC power supply, and the output terminal is connected to the input terminal of the transformer; the transformer is used to step down the external AC power supply to output a DC low-voltage control power supply.

[0016] The present invention also proposes a battery testing chamber using the above-mentioned high-voltage protection system suitable for the chamber.

[0017] Compared with the prior art, the advantages of the present invention are: This invention achieves a linkage mechanism between the temperature chamber door status and multiple high-voltage power supplies by connecting normally closed relays in series in each high-voltage test branch circuit and using a door induction switch to uniformly control the coils of each relay. This ensures that all high-voltage branches are simultaneously disconnected when the door is opened, directly solving the most significant risk source in battery testing—the high-voltage DC current on the battery pack and its tooling—rather than just the 380V power supply of the temperature chamber itself. The safety protection is more targeted, effectively preventing accidental electric shock injuries, and has a fast response speed and extremely high reliability.

[0018] This invention, through ingenious circuit design, allows the switching on and off of all test branches to be controlled by a single inductive switch. With just one inductive switch action, the power supply to all high-voltage test branches can be simultaneously cut off. Changes in the state of the chamber door can instantly achieve high-voltage isolation, ensuring that opening the door cuts off all high-voltage branches and closing it restores power supply. This avoids safety risks caused by asynchronous or missed operations of multiple switches. It also ensures that under any circumstances, as long as the door is opened, the chamber is in a state of no high voltage, fundamentally eliminating safety hazards.

[0019] In this invention, the normally closed relays of each battery pack test branch operate independently without affecting each other, thus effectively ensuring the safety isolation of each branch. This achieves an effective combination of centralized management and individual branch isolation. Faults in a single battery pack or its test circuit (such as short circuits or overloads) will not affect the normal testing and safety protection functions of other circuits. This facilitates fault diagnosis and maintenance without interrupting all tests.

[0020] In this invention, the transformer steps down the voltage to provide a 24V low-voltage power supply to the inductive switch and relay coil, thus safely separating the high-voltage test circuit from the low-voltage control circuit.

[0021] The system of this invention uses a host computer to collect the status of the induction switch and each branch relay in real time, thereby determining whether its action is in place, and alarming or shutting down in case of abnormality, providing redundant safety protection at the software layer.

[0022] The multi-branch relays in this invention adopt a modular architecture, which makes it easy to add or remove the battery pack under test according to the test requirements without adjusting the overall control logic, and has strong scalability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a high-pressure protection system for a temperature chamber proposed in an embodiment of the present invention.

[0024] Figure 1 In the diagram, 1-normally open inductive switch, 2-relay one, 3-relay two, 4-first transformer, 5-air switch, 6-external AC power supply, 7-first charging and discharging power supply, 8-PLC controller, 9-host computer, 10-first battery pack, 11-temperature chamber, 12-LAN bus, 13-second battery pack, 14-second charging and discharging power supply, 15-second transformer, 16-relay three, 17-relay four, 18-temperature chamber body, 19-temperature chamber door, 20-control cabinet. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be further described below.

[0026] Example 1 This embodiment 1 proposes a high-voltage protection system suitable for temperature chambers. It adopts a distributed architecture, achieving electrical isolation between high-voltage testing and low-voltage control, and ensures absolute reliability of safety protection through a pure hardware circuit. For example... Figure 1 As shown, the system includes a temperature chamber 11, a control cabinet 20, a relay group (relay 12, relay 23, relay 316, relay 417), an external AC power supply 6, a normally open inductive switch 1, a DC low-voltage control power generation module, and a PLC controller 8. The specific connection relationships of each component are as follows: The temperature chamber 11 includes a temperature chamber door 19 and a temperature chamber body 18. A normally open inductive switch 1 is installed on the temperature chamber door to detect the door's open / closed state. The body 18 houses two battery packs under test (i.e., the first battery pack 10 and the second battery pack 13). The control cabinet 20 houses a host computer 9 and two high-voltage charging / discharging power supplies (i.e., the first charging / discharging power supply 7 and the second charging / discharging power supply 14). During testing, each battery pack under test forms a high-voltage test branch circuit with its corresponding high-voltage charging / discharging power supply to complete charging / discharging and various performance tests. To ensure operational safety during testing, a corresponding normally closed relay is connected in series in each high-voltage test branch circuit, with all its main contacts being normally closed. In the system's default state, the temperature chamber door 19 is closed, the relay coil is de-energized, and the normally closed contacts remain closed, thus maintaining the direct connection between the high-voltage charging / discharging power supply and the battery pack under test, enabling high-voltage testing.

[0027] In this embodiment, the two battery packs under test and the two high-voltage charging and discharging power supplies form two high-voltage test branch circuits, as follows: The first high-voltage test branch circuit: The positive output terminal of the first high-voltage charging and discharging power supply 7 is connected in series with the normally closed main contact of relay 2, and then connected to the positive terminal of the first battery pack 10 inside the temperature chamber 11 via a cable. The negative terminal of the first battery pack 10 is connected in series with the normally closed main contact of relay 3, and then returns to the negative terminal of the first high-voltage charging and discharging power supply 7.

[0028] The second high-voltage test branch circuit: the positive terminal of the second high-voltage charging and discharging power supply 14 is connected in series to the normally closed main contact of relay three 16, and then connected to the positive terminal of the second battery pack 13. The negative terminal of the second battery pack 13 is connected in series to the normally closed main contact of relay four 17, and then returned to the negative terminal of the second high-voltage charging and discharging power supply 14.

[0029] The power supply for both high-voltage test branch circuits mentioned above comes from an external AC power supply 6. This external AC power supply 6 includes a 380V AC power supply and a 220V AC power supply. The 380V AC power supply is connected to the control cabinet 20 and the temperature chamber 11, providing working power for the high-voltage charging and discharging power supply in the control cabinet 20, and also powering the high-power loads such as the compressor and heater in the temperature chamber 11. The 220V AC power supply is stepped down to 24V DC by the DC low-voltage control power generation module (transformer) and used as a low-voltage control power supply to power the unified control circuit of the core hardware.

[0030] In this embodiment, the DC low-voltage control power supply generation module includes an air switch 5, a first transformer 4, and a second transformer 15. Besides its switching function, the air switch 5 provides short-circuit and overcurrent protection, quickly cutting off power supply in case of electrical abnormalities to prevent equipment damage and safety accidents. The 220V AC power supply is first connected to the input terminal of the air switch 5, and then split into two paths from the output terminal of the air switch 5, respectively connected to the primary coils (input terminals) of the first transformer 4 and the second transformer 15. The secondary coils (output terminals) of the first transformer 4 and the second transformer 15 independently step down the 220V AC and convert it to 24V DC. The positive output terminals (24V DC+) of the two transformers are connected in parallel to form a common 24V DC+ bus. This bus serves as the DC low-voltage control power supply for the entire high-voltage safety isolation system, providing power for the subsequent unified hardware control circuit. The negative output terminal (24V DC-) of the first transformer 4 is connected to the coils (A2 terminal) of the relays 2 and 3, which it supplies power. The negative output terminal (24V DC-) of the second transformer 15 is connected to the coil (A2 terminal) of the relays 16 and 17 that it supplies power.

[0031] like Figure 1 As shown, a normally open inductive switch 1 is installed on the door of the incubator. The inductive switch 1 is in the normally open state and is used to detect the opening and closing state of the incubator door 19 and input its signal to the PLC controller 8.

[0032] In this embodiment, a unified control loop is formed by the induction switch 1 installed on the temperature chamber door 19, the PLC controller 8, the relays on each test branch connected in parallel, and the corresponding transformers. In this unified control loop, the 24V DC+ positive output terminal of the first transformer 4 is connected to the input terminal of the induction switch 1 installed on the temperature chamber door 19 via a cable. In this embodiment, the induction switch 1 is a normally open magnetic induction proximity switch. The output terminal of the induction switch 1 is connected to the input terminal I0.0 of the PLC controller 8 via a cable.

[0033] One of the core functions of PLC controller 8 in this unified safety control loop is as a hardware wiring connector. Internally, it connects the input terminal I0.0 directly to the four output terminals (Q0.0, Q0.1, Q0.2, Q0.3) via circuit board wiring, as follows: The output terminal Q0.0 is connected to the coil (A1 terminal) of relay 2. The output terminal Q0.1 is connected to the coil (A1 terminal) of relay 3. (This forms independent circuit 1: 24V+ bus → inductive switch 5 → PLC controller 8 (I0.0 → Q0.0 / Q0.1) → relay coil 1 / relay coil 2 → first transformer 4 (24V-)). The output terminal Q0.2 is connected to the coil (A1 terminal) of relay 316.

[0034] The output terminal Q0.3 is connected to the coil (A1 terminal) of relay 17.

[0035] (This forms independent circuit 2: 24V+ bus → inductive switch 5 → PLC controller 8 (I0.0 → Q0.2 / Q0.3) → relay three coil / relay four coil → transformer 2 (24V-)).

[0036] When the temperature chamber door 19 is opened, the induction switch 1 is triggered (normally open contact closes), the DC low voltage control power supply (24V) is turned on, and its output current flows through the unified control circuit (independent circuit 1 and independent circuit 2), synchronously driving all normally closed relay coils to be energized, so that their normally closed contacts are quickly opened, thereby physically cutting off all high voltage test branch circuits between the high voltage charging and discharging power supply and the battery pack under test at one time, ensuring that the temperature chamber (11) is in a state of no high voltage during the operation of opening the temperature chamber door (19), avoiding electric shock or danger to the operator, and realizing high voltage safety isolation.

[0037] In addition, the PLC controller 8 not only serves as a wire connector but also detects and collects the operating status of the induction switch 5 and each relay, transmitting their signals to the host computer 9 to achieve real-time monitoring and alarm for each branch. The host computer 9 communicates with each high-voltage charging and discharging power supply and the PLC controller 8 within the control cabinet 20 via a LAN bus, forming a monitoring system. It communicates with each high-voltage charging and discharging power supply to monitor the voltage and current of the battery pack under test. It also communicates with the PLC controller 8 via the LAN bus 12, enabling real-time monitoring and logical judgment of the safety parameters of the temperature chamber door 19 and the operation of each relay based on the detection signals from the PLC controller 8. In case of abnormal conditions, it issues an alarm and executes an emergency shutdown operation, further enhancing system safety.

[0038] In this embodiment, multiple products under test can be placed simultaneously inside the chamber 18. Each battery pack under test is connected to the system via an independent high-voltage charging / discharging power supply and a relay control branch, forming a multi-branch parallel test structure. Each high-voltage power supply branch is connected in series with a normally closed relay, which remains closed by default, ensuring that each high-voltage charging / discharging power supply remains connected to the corresponding battery pack when the chamber door 19 is closed, thereby enabling normal charging / discharging and performance testing of each battery pack. When the chamber door 19 is opened, the induction switch 1 installed on the chamber door 19 is activated, outputting a 24V control voltage signal to energize the coils of each relay, causing the normally closed contacts of all branches to open simultaneously, thereby synchronously cutting off the high-voltage connection of all battery packs under test, effectively preventing electric shock or danger to operators during the opening process, and achieving high-voltage safety isolation.

[0039] The specific working process of the high-voltage protection system in this embodiment is as follows: 1. Normal working condition (door closed): The incubator door 19 is closed, and the sensor switch 1 is not triggered, remaining in its normally open (disconnected) state.

[0040] At this time, the 24V DC hardware unified control circuit is disconnected at the induction switch 1, the input terminal I0.0 of the PLC controller 8 has no signal, and its output terminals Q0.0-Q0.3 have no voltage output.

[0041] The coils of all normally closed relays (Relay 1-2, Relay 2-3, Relay 3-16, and Relay 4-17) are not energized, and their normally closed main contacts remain closed. Both high-voltage test circuits are in a conducting state, and the high-voltage charging and discharging power supplies (First Charging and Discharging Power Supply 7 and Second Charging and Discharging Power Supply 14) can perform normal charging and discharging tests on their corresponding battery packs (First Battery Pack 10 and Second Battery Pack 13).

[0042] The PLC controller 8 uploads the "door closed" status and the "not activated" status of each relay to the host computer 9. The host computer 9 interface displays "System normal, testing in progress".

[0043] 2. Safety protection status (door open): When the operator opens the chamber door 19, the door moves away from the sensor, and the inductive switch 1 is immediately triggered, its internal contacts changing from normally open to closed. At this moment, the current on the 24V DC+ bus instantaneously flows through the closed inductive switch 1, reaching the input terminal I0.0 of the PLC controller 8, and then synchronously outputs from the output terminals Q0.0-Q0.3 through its internal hardware path. Simultaneously, the current flows through the coils of all four relays (relay 12, relay 23, relay 316, and relay 417). The coils are energized, generating magnetic force that immediately opens their normally closed main contacts. The two high-voltage test circuits are synchronously and forcibly physically disconnected. At this time, even if the high-voltage charging and discharging power supply is still operating, the battery pack terminals inside the chamber 11 are completely de-energized, allowing the operator to safely perform battery replacement, wiring, and other operations, fundamentally eliminating the risk of electric shock.

[0044] The PLC controller 8 detects that the sensor switch status changes to "triggered" and simultaneously detects that all relay statuses change to "activated" through auxiliary contacts, and uploads these statuses. The host computer 9 interface displays "Safety isolation activated".

[0045] 3. Modular expansion: To add a third battery pack test circuit, simply add a high-voltage charging / discharging power supply and two normally closed relays to the system, and optionally add a transformer to form a third power module. Connect one end of the new relay coil in parallel to an unused output terminal (e.g., Q0.4) of PLC controller 8, and the other end to the 24V DC- of the new transformer (or an existing transformer). Connect the main contacts of the new relay in series with the new high-voltage test circuit. The entire process requires no modification to the PLC program or main control logic, achieving a "plug-and-play" modular expansion.

[0046] 4. Fault monitoring and redundancy protection: The monitoring software within the host computer 9 continuously runs safety logic checks. For example, the system is set to receive "activated" feedback signals from all relays within 100 milliseconds after receiving the "door open" signal.

[0047] If no feedback is received from a relay within the time limit, it is determined that the relay may have failed or its coil may be open-circuited. The host computer 9 then triggers an audible and visual alarm and can send a command to the corresponding high-voltage charging and discharging power supply via the LAN bus 12 to execute an emergency soft shutdown, providing both "early warning" and "secondary protection" functions.

[0048] Power redundancy: If the first transformer 4 fails, only relays 2 and 3 will malfunction, and the high-voltage circuit of the first battery pack 1 will not be disconnected (the host computer should then issue an alarm). However, the second transformer 15 will remain operational, ensuring the normal operation of relays 16 and 17, and the test branch of the second battery pack 2 will still be safely isolated. This design achieves fault isolation, preventing a single point of failure from causing the entire system's protection function to be completely lost.

[0049] The high-voltage protection system proposed in this embodiment effectively solves the technical problems of lack of unified safety control, complex operation, insufficient scalability, and weak monitoring capabilities in multi-battery pack testing within a temperature chamber by using multi-branch high-voltage linkage control of inductive switches and relays. By connecting normally closed relays in series in each high-voltage power supply branch and using the inductive switch on the temperature chamber door to uniformly control their coils, all high-voltage circuits are simultaneously cut off when the temperature chamber door is opened. This achieves multi-branch high-voltage isolation with a single action, effectively eliminating safety hazards during operation. Simultaneously, the modular design and independent negative return control architecture facilitate the addition or removal of test branches without large-scale adjustments to the system logic, making system expansion flexible and convenient, enabling fault isolation, and reducing maintenance costs. The design also incorporates real-time monitoring and anomaly alarms of each battery pack branch status by a host computer, achieving dual protection of hardware and software. This system effectively solves the major hidden dangers in high-voltage safety isolation of existing battery testing temperature chambers, possessing extremely high industrial application value and market prospects.

[0050] Example 2 Example 2 also proposes a battery testing chamber that uses the high-voltage protection system suitable for chambers described in Example 1 above.

[0051] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and content disclosed in the present invention without departing from the scope of the present invention shall be deemed to have remained within the protection scope of the present invention.

Claims

1. A high-pressure protection system suitable for a temperature chamber, characterized in that, Includes a temperature chamber, door status detection unit, DC low-voltage control power supply, and unified control loop: The chamber contains at least one battery pack under test; each battery pack under test forms a high-voltage test branch circuit with its corresponding high-voltage charging and discharging power supply. Each high-voltage test branch circuit is independent of each other and is connected in series with a corresponding normally closed switching device. The door status detection unit is installed on the door of the incubator to detect the opening and closing status of the door; The unified control loop receives a trigger signal from the door status detection unit and, in response to the trigger signal, synchronously distributes the output of the DC low-voltage control power supply to the control terminals of all normally closed switching devices to drive them to operate synchronously. When the chamber door is opened, the door status detection unit is triggered, and the output current of the DC low-voltage control power supply flows through the unified control circuit, synchronously driving all normally closed switching devices to operate, so that the normally closed switching devices change from the normally closed state to the open state, thereby physically cutting off all high-voltage test branch circuits at once.

2. The high-pressure protection system for a temperature chamber according to claim 1, characterized in that, The door status detection unit is a normally open inductive switch: when the temperature chamber door is closed, the inductive switch is in the open state, blocking the unified control loop; when the temperature chamber door is opened, the inductive switch switches to the closed state, connecting the unified control loop.

3. A high-pressure protection system suitable for a temperature chamber according to claim 1, characterized in that, The normally open inductive switch is either a magnetic induction type or a mechanical normally open switch.

4. A high-pressure protection system suitable for a temperature chamber according to claim 1, characterized in that, The normally closed switching device is a normally closed relay or a normally closed contactor.

5. A high-pressure protection system suitable for a temperature chamber according to claim 1, characterized in that, The unified control loop includes a PLC controller, which acts as a wire connector in the unified control loop, providing an electrical connection and parallel distribution path between the output terminal of the door status detection unit and the control terminals of all normally closed on / off devices; at the same time, the PLC controller also acts as a status detector, used to detect the working status of the door status detection unit and all normally closed on / off devices.

6. A high-pressure protection system suitable for a temperature chamber according to claim 1, characterized in that, The DC low-voltage control power supply is provided by the control power generation module; The control power generation module includes an air switch and a transformer: the input terminal of the air switch is connected to an external AC power source, and the output terminal is connected to the input terminal of the transformer; the transformer is used to step down the external AC power source and output a low-voltage DC control power source.

7. A high-pressure protection system suitable for a temperature chamber according to claim 6, characterized in that, The control power generation module includes two or more independent redundant power modules; the positive terminals of each redundant power module are connected in parallel and then connected to the unified control loop, and their negative terminals are independently connected to the control terminal of the normally closed switching device that it is responsible for powering.

8. A high-pressure protection system suitable for a temperature chamber according to claim 1, characterized in that, The control terminals of all normally closed switching devices are connected in parallel to the same output node of the unified control loop; the number of high-voltage test branch circuits corresponds to the number of normally closed switching devices, and each high-voltage test branch circuit and its corresponding normally closed switching device constitute a test branch that can be operated and maintained independently.

9. A high-pressure protection system suitable for a temperature chamber according to claim 5, characterized in that, It also includes a host computer, which is communicatively connected to the PLC controller and the high-voltage charging and discharging power supply to form a monitoring system. The host computer is used to monitor the voltage and current of the battery pack under test, and also to monitor and judge the safety parameters of the temperature chamber door status and relay operation in real time through the PLC controller signal, and issue an alarm when the status is abnormal.

10. A battery testing chamber, characterized in that, Use the high-voltage protection system as described in any one of claims 1-9.

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