An intrinsically safe explosion-proof battery

Abstract

The application belongs to the technical field of lithium batteries, and discloses an intrinsic safety type explosion-proof battery, which comprises a battery body, a battery positive electrode port and a battery negative electrode port, the battery body is connected with the battery positive electrode port through a first lead wire, and the battery body is connected with the battery negative electrode port through a second lead wire; a three-stage power supply and current limiting circuit is further arranged between the first lead wire and the second lead wire, the three-stage power supply and current limiting circuit comprises a first-stage power supply and current limiting circuit, a second-stage power supply and current limiting circuit and a third-stage power supply and current limiting circuit; the first-stage power supply and current limiting circuit, the second-stage power supply and current limiting circuit and the third-stage power supply and current limiting circuit are used for limiting the discharge time and the discharge current of the battery body. The explosion-proof battery is provided with the three-stage current limiting and power supply circuit, the current size of the battery can be effectively limited, the occurrence of the spark caused by the violent fluctuation of the current is avoided, and the safety of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery, in particular to an intrinsic safety type explosion-proof battery. BACKGROUND

[0002] At present, the application range of lithium battery is more and more extensive, and various battery types are developed. For specific working environment, the battery needs to be designed with corresponding safety.

[0003] When the battery works in a specific dangerous area, such as a mine, a dust workshop or a chemical workshop, high-level safety design should be carried out to ensure safety. In dangerous environment, the battery should be avoided to generate electric spark. Although protective measures are designed in the prior art, electric spark cannot be completely avoided, and there is still a safety hazard. SUMMARY

[0004] The purpose of the present application is to provide an intrinsic safety type explosion-proof battery with higher safety, which can avoid the generation of electric spark and meet the needs of life in dangerous environment.

[0005] In order to achieve the above purpose, the present application provides an intrinsic safety type explosion-proof battery, which comprises a battery body, a battery positive electrode port and a battery negative electrode port, the battery body is connected with the battery positive electrode port through a first lead wire, and the battery body is connected with the battery negative electrode port through a second lead wire; a three-stage power supply and current limiting circuit is further arranged between the first lead wire and the second lead wire, the three-stage power supply and current limiting circuit comprises a first-stage power supply and current limiting circuit, a second-stage power supply and current limiting circuit and a third-stage power supply and current limiting circuit; the first-stage power supply and current limiting circuit, the second-stage power supply and current limiting circuit and the third-stage power supply and current limiting circuit are used to limit the discharge time and discharge current of the battery body.

[0006] Further, the first-stage power supply and current limiting circuit, the second-stage power supply and current limiting circuit and the third-stage power supply and current limiting circuit have the same structure, and the first-stage power supply and current limiting circuit comprises a power supply circuit, a current limiting circuit, a current detection resistor and a current limiting switch, the first port of the power supply circuit is connected with the first lead wire, the second port of the power supply circuit is connected with the first port of the current limiting circuit, the current detection resistor and the current limiting switch are arranged on the second lead wire, the second port of the current limiting circuit is connected with the current detection resistor, and the third port of the current limiting circuit is connected with the current limiting switch; when the current of the current detection resistor reaches a first threshold value, the current limiting circuit makes the current limiting switch closed and latches the state of the current limiting switch.

[0007] Further, the current limiting circuit comprises a comparator, a first transistor, a first MOS tube and a second resistor; a first port of the comparator is connected with a first port of the MOS tube, a second port of the comparator is connected with a first port of the current detection resistor, a third port of the comparator is connected with a second port of the current detection resistor, the first port of the current detection resistor is connected with a second port of the MOS tube, a third port of the MOS tube is connected with a first port of the second resistor, the first port of the comparator is connected with a first port of the first transistor, a second port of the first transistor is connected with the second port of the current detection resistor, and a third port of the first transistor is connected with a second port of the second resistor.

[0008] Further, the intrinsically safe explosion-proof battery further comprises a first level protection module and a second level protection module, the first level protection module and the second level protection module are arranged on the second lead wire, and the first level protection module and the second level protection module are arranged between the battery body and the third level power supply and current limiting circuit; the first level protection module is used for overvoltage, undervoltage, overcurrent and short circuit protection of the battery, and the second protection module is used for overvoltage, charging and overcurrent protection of the battery.

[0009] Further, the intrinsically safe explosion-proof battery further comprises a special charging port module, the special charging port module comprises a positive charging port, a negative charging port and an isolation circuit; the positive charging port and the negative charging port are connected with a first interface of the first lead wire and a second interface of the second lead wire through the isolation circuit; the first interface is arranged between the battery body and the third level power supply and current limiting circuit, and the second interface is arranged between the second level protection module and the third level power supply and current limiting circuit.

[0010] Further, the isolation circuit comprises a first diode, a second diode and a third diode connected in sequence, a cathode of the first diode is connected with the first interface, an anode of the first diode is connected with a cathode of the second diode, an anode of the second diode is connected with a cathode of the third diode, and an anode of the third diode is connected with the positive charging port.

[0011] Further, the isolation circuit comprises a three-level symmetrical isolation, the three-level symmetrical isolation circuit comprises a first symmetrical isolation circuit, a second symmetrical isolation circuit and a third symmetrical isolation circuit connected in sequence, the first symmetrical isolation circuit is connected with the first interface and the second interface, and the third symmetrical isolation circuit is connected with the positive charging port and the negative charging port.

[0012] Further, the intrinsically safe explosion-proof battery further comprises a current limiting resistor, and the current limiting resistor is arranged on the first lead wire.

[0013] Further, the intrinsically safe explosion-proof battery further comprises a fuse, and the fuse is arranged on the first lead wire.

[0014] Further, the intrinsic safety type explosion-proof battery further comprises a temperature protection device; the temperature protection device is arranged on the first lead wire or the second lead wire.

[0015] Compared with the prior art, the intrinsic safety type explosion-proof battery has the beneficial effects that: the three-stage current limiting and power supply circuit is designed in the explosion-proof battery, which can effectively limit the current size of the battery, avoid the occurrence of spark caused by the violent fluctuation of the current, and improve the safety of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a whole structure schematic diagram of the intrinsic safety type explosion-proof battery of the present application;

[0017] Figure 2 is a structure schematic diagram of a current limiting circuit in the intrinsic safety type explosion-proof battery of the present application;

[0018] Figure 3 (a) is a structure schematic diagram of a third-stage power supply and current limiting circuit in the intrinsic safety type explosion-proof battery of the present application;

[0019] Figure 3 (b) is an enlarged schematic diagram of the structure schematic diagram of the third-stage power supply and current limiting circuit in the intrinsic safety type explosion-proof battery of the present application;

[0020] Figure 4 is a first structure schematic diagram of a special charging port module in the intrinsic safety type explosion-proof battery of the present application;

[0021] Figure 5 is a first connection schematic diagram of the special charging port module and the battery in the intrinsic safety type explosion-proof battery of the present application;

[0022] Figure 6 is a second structure schematic diagram of the special charging port module in the intrinsic safety type explosion-proof battery of the present application;

[0023] Figure 7 is a second connection schematic diagram of the special charging port module and the battery in the intrinsic safety type explosion-proof battery of the present application; DETAILED DESCRIPTION

[0024] The specific embodiments of the present application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0025] As Figure 1The application discloses an intrinsic safety type explosion-proof battery, which comprises a battery body, a battery positive electrode port and a battery negative electrode port, the battery body is connected with the battery positive electrode port through a first lead wire, and the battery body is connected with the battery negative electrode port through a second lead wire; a three-stage power supply and current limiting circuit is further arranged between the first lead wire and the second lead wire, the three-stage power supply and current limiting circuit comprises a first-stage power supply and current limiting circuit, a second-stage power supply and current limiting circuit and a third-stage power supply and current limiting circuit; the first-stage power supply and current limiting circuit, the second-stage power supply and current limiting circuit and the third-stage power supply and current limiting circuit are used for limiting the discharge time and the discharge current of the battery body.

[0026] In the embodiment, the battery body can be a lithium battery, a battery pack composed of lithium batteries or the like. It is known to those skilled in the art that when the battery body is discharged, the positive and negative electrodes of the battery are simultaneously connected to both ends of a load. During the discharge, due to the influence of external environmental factors, there is a process of entering a stable discharge, and during the change process, electric sparks are easily generated. If in a conventional production environment, these electric sparks will not cause any harm, but in a specific dangerous environment, such as an environment including flammable and explosive dust and other environments, the electric sparks must be eliminated to eliminate safety hazards.

[0027] In the embodiment, in order to protect or limit the discharge process of the battery body, other components need to be arranged on the discharge circuit of the battery to regulate the discharge process of the battery.

[0028] In the embodiment, the first lead wire and the second lead wire are directly provided with the three-stage power supply and current limiting circuit, one end of each stage of the power supply and current limiting circuit is connected with the first lead wire, and the other end is connected with the second lead wire. When the battery is discharged, the discharge current and the discharge time are limited through the three-stage power supply and current limiting circuit, so that the power output of the battery body can be limited, and the generation of electric sparks can be avoided. When the discharge current exceeds the set value, the comparator is reversed, a low-level output cuts off the current limiting switch, and the purpose of cutting off the discharge circuit is achieved. The set value of the comparator reversal is connected to the same phase end of the comparison through the power supply circuit and the voltage dividing resistor. The three-stage power supply and current limiting circuit is completed independently and works at the same time. If any stage or two stages fail, the circuit is still protected.

[0029] In the embodiment, the three-stage power supply and current limiting circuit corresponds to three levels of intrinsic safety, the first-stage power supply and current limiting circuit corresponds to EX "ic", the first-stage power supply and current limiting circuit and the second-stage power supply and current limiting circuit correspond to EX "ib", and the first-stage power supply and current limiting circuit, the second-stage power supply and current limiting circuit and the third-stage power supply and current limiting circuit correspond to EX "ia".

[0030] Reference Figure 1In the embodiment, the first, second and third power supply and current limiting circuits have the same structure, and each of the first power supply and current limiting circuits comprises a power supply circuit, a current limiting circuit, a current detection resistor and a current limiting switch, the first port of the power supply circuit is connected with the first wire, the second port of the power supply circuit is connected with the first port of the current limiting circuit, the current detection resistor and the current limiting switch are arranged on the second wire, the second port of the current limiting circuit is connected with the current detection resistor, and the third port of the current limiting circuit is connected with the current limiting switch; when the current of the current detection resistor reaches the first threshold value, the current limiting circuit makes the current limiting switch closed and locks the state of the current limiting switch.

[0031] In the embodiment, the second power supply and current limiting circuit comprises a second power supply circuit, a second current limiting circuit, a second current detection resistor and a second current limiting switch, the first port of the second power supply circuit is connected with the first wire, the second port of the second power supply circuit is connected with the first port of the second current limiting circuit, the second current detection resistor and the second current limiting switch are arranged on the second wire, the second port of the second current limiting circuit is connected with the second current detection resistor, and the third port of the second current limiting circuit is connected with the second current limiting switch; when the current of the second current detection resistor reaches the second threshold value, the second current limiting circuit makes the second current limiting switch closed and locks the state of the second current limiting switch.

[0032] In the embodiment, the third power supply and current limiting circuit comprises a third power supply circuit, a third current limiting circuit, a third current detection resistor and a third current limiting switch, the first port of the third power supply circuit is connected with the first wire, the second port of the third power supply circuit is connected with the first port of the third current limiting circuit, the third current detection resistor and the third current limiting switch are arranged on the second wire, the second port of the third current limiting circuit is connected with the third current detection resistor, and the third port of the third current limiting circuit is connected with the third current limiting switch; when the current of the third current detection resistor reaches the third threshold value, the third current limiting circuit makes the third current limiting switch closed and locks the state of the third current limiting switch.

[0033] In the embodiment, the second port of the current detection resistor in the first power supply and current limiting circuit is connected with the negative electrode of the battery body, the first port of the current detection resistor is connected with the first port of the current limiting switch, the second port of the current limiting switch is connected with the second port of the second current detection resistor, the first port of the second current limiting switch is connected with the first port of the second current limiting switch, the second port of the second current limiting switch is connected with the second port of the third current detection resistor, and the second port of the third current limiting switch is connected with the negative electrode port of the battery.

[0034] Reference Figure 2In the embodiment, the current limiting circuit comprises a comparator, a first transistor and a first MOS transistor and a second resistor; the first port of the comparator and the first port of the MOS transistor are connected, the second port of the comparator and the first port of the current detection resistor are connected, the third port of the comparator and the second port of the current detection resistor are connected, the first port of the current detection resistor and the second port of the MOS transistor are connected, the third port of the MOS transistor and the first port of the second resistor are connected, the first port of the comparator and the first port of the first transistor are connected, the second port of the first transistor and the second port of the current detection resistor are connected, and the third port of the first transistor and the second port of the second resistor are connected.

[0035] In the embodiment, the second current limiting circuit, the third current limiting circuit and the current limiting circuit have the same structure.

[0036] In the embodiment, when the current of the detection resistor reaches the first current, the non-inverting terminal of the comparator is connected to the reference voltage, and the inverting terminal is connected to the current detection resistor; when the voltage generated by the discharge current on the current detection resistor is higher than the reference voltage, the comparator flips, outputs a low level, and the MOS transistor is open, thereby breaking the discharge circuit. After the discharge circuit is broken, the D terminal (P- terminal) of the MOS transistor will be pulled up to the P+ voltage by the load, and this voltage will be fed back to the base of the transistor, so that the transistor is turned on, and the G terminal of the MOS transistor is locked in a low level state, that is, the MOS transistor is locked to be continuously turned off until the load is disconnected.

[0037] In the embodiment, the flipping speed of the comparator is very fast, which can reach nanoseconds, so the time of overcurrent in the circuit is very short, and the purpose of no electric spark is achieved.

[0038] In the embodiment, referring to Figure 3 (a) and Figure 3 (b), the application provides a detailed application circuit of Figure 2 . Figure 3 (a) and Figure 3 (b) specifically show the circuit schematic diagram of the third power supply and current limiting circuit. Since the first power supply and current limiting circuit, the second power supply and current limiting circuit and the third power supply and current limiting circuit have the same structure, the specific implementation can be known according to Figure 3 .

[0039] In Figure 3(b) In the middle, U3 is LDO, U3 and capacitor constitute a power supply circuit, output high precision constant voltage value through the voltage divider resistor to form a reference voltage Vref connected to the non-inverting terminal of the comparator. The non-inverting terminal and the inverting terminal of the comparator are connected to RS2 (current sensing resistor) at the same time, when the load current is too high, RS2 will be higher than the reference voltage of the comparator, the comparator flips, outputs low level, MOS Q3 is cut off, the circuit is cut off, at the same time, the D terminal of Q3 will be connected to the positive voltage of the battery by the load, this voltage passes through R34 to the base of Q6, so that Q6 is turned on, thereby locking the G terminal level of Q3, keeping Q3 off continuously until the load is disconnected.

[0040] In the embodiment, the intrinsically safe explosion-proof battery further comprises a first protection module and a second protection module, the first protection module and the second protection module are arranged on the second lead wire, and the first protection module and the second protection module are arranged between the battery body and the third power supply and current limiting circuit; the first protection module is used for overvoltage protection, undervoltage protection, overcurrent protection and short circuit protection of the battery, and the second protection module is used for overvoltage protection, charging protection and overcurrent protection of the battery.

[0041] In the embodiment, the first protection module comprises an undervoltage protection switch, a first overvoltage protection switch and a first protection control module, and the first protection control module controls the operation of the undervoltage protection switch and the first overvoltage protection switch. The second protection module comprises a second overvoltage protection switch and a second protection control module, and the second protection control module is used for controlling the operation of the second overvoltage protection switch.

[0042] The intrinsically safe explosion-proof battery can be charged and discharged through the positive electrode port and the negative electrode port of the battery, and a special charging port can be additionally arranged to make the positive electrode port and the negative electrode port of the battery only used for discharging.

[0043] Referring to Figures 4 to 7 In the embodiment, the intrinsically safe explosion-proof battery further comprises a special charging port module, the special charging port module comprises a positive charging port, a negative charging port and an isolation circuit, the positive charging port and the negative charging port are connected with a first interface of the first lead wire and a second interface of the second lead wire through the isolation circuit, the first interface is arranged between the battery body and the third power supply and current limiting circuit, and the second interface is arranged between the second protection module and the third power supply and current limiting circuit.

[0044] In the embodiment, the first interface is point A in the figure, and the second interface is point B in the figure.

[0045] Referring to Figure 4 and Figure 5In the embodiment, the isolation circuit comprises a first diode, a second diode and a third diode connected in sequence, the cathode of the first diode is connected with the first interface, the anode of the first diode is connected with the cathode of the second diode, the anode of the second diode is connected with the cathode of the third diode, and the anode of the third diode is connected with the positive charging port. The positive charging port and the negative charging port are connected through a capacitor.

[0046] In the embodiment, the TH port for detecting the temperature of the battery can be arranged in parallel with the negative charging port.

[0047] In the embodiment, the diodes D1, D2 and D3 are used as the isolation circuit. D1 corresponds to EX "ic", D1 and D2 correspond to EX "ib", and D1, D2 and D3 correspond to EX "ia". The purpose of adding the diode isolation is to prevent the lithium battery from discharging from the charging port.

[0048] Referring to Figure 6 and Figure 7 In the embodiment, the isolation circuit comprises a three-stage symmetrical isolation circuit, and the three-stage symmetrical isolation circuit comprises a first symmetrical isolation circuit, a second symmetrical isolation circuit and a third symmetrical isolation circuit connected in sequence. The first symmetrical isolation circuit is connected with the first interface and the second interface, and the third symmetrical isolation circuit is connected with the positive charging port and the negative charging port.

[0049] In the embodiment, the first symmetrical isolation circuit, the second symmetrical isolation circuit and the third symmetrical isolation circuit are the same.

[0050] In the embodiment, the first port of the first symmetrical isolation circuit is connected with the first interface, the second port of the first symmetrical isolation circuit is connected with the second interface, the third port of the first symmetrical isolation circuit is connected with the first port of the second symmetrical isolation circuit, the fourth port of the first symmetrical isolation circuit is connected with the second port of the second symmetrical isolation circuit, the third port of the second symmetrical isolation circuit is connected with the first port of the third symmetrical isolation port, the fourth port of the second symmetrical isolation circuit is connected with the second port of the third symmetrical isolation port, the third port of the third symmetrical isolation circuit is connected with the positive charging port, and the fourth port of the third symmetrical charging circuit is connected with the negative charging port.

[0051] Referring to Figure 7 , A, B positions increase Q1, Q3, Q5 three-stage symmetrical isolation circuit, when the charger control signal CTRL is connected, Q1, Q3, Q5 are turned on, and zero voltage difference charging is realized. Q1 corresponds to EX "ic", Q1 and Q3 correspond to EX "ib", and Q1, Q2 and Q5 correspond to EX "ia". The purpose of adding the MOS tube isolation is to prevent the lithium battery from discharging from the charging port when the charger is removed.

[0052] Referring toFigure 1 In the embodiment, the intrinsically safe explosion-proof battery further comprises a current-limiting resistor, and the current-limiting resistor is arranged on the first lead wire. The current-limiting resistor is used to adjust the short-circuit current of the lithium battery.

[0053] Referring to Figure 1 In the embodiment, the intrinsically safe explosion-proof battery further comprises a fuse, and the fuse is arranged on the first lead wire. The fuse is used to provide short-circuit protection for the intrinsically safe lithium battery.

[0054] Referring to Figure 1 In the embodiment, the intrinsically safe explosion-proof battery further comprises a temperature protection device, and the temperature protection device is arranged on the first lead wire or the second lead wire. The temperature protection device is an optional device, which can be a PTC or a temperature switch or other temperature device.

[0055] Referring to Figure 1 In the embodiment, the NTC and the TH port are optional functions, and the purpose is to enable the host to detect the temperature of the battery.

[0056] In summary, the embodiment of the application provides an intrinsically safe explosion-proof battery, and the beneficial effects are as follows: the explosion-proof battery is designed with a three-stage current-limiting and power supply circuit, which can effectively limit the current size of the battery and avoid the generation of sparks caused by the violent fluctuation of the current, thereby improving the safety of the battery.

[0057] The above only describes the preferred embodiments of the application, and it should be noted that, for those skilled in the art, without departing from the technical principles of the application, a number of improvements and replacements can be made, and these improvements and replacements should also be considered as the protection scope of the application.

Claims

1. An intrinsically safe explosion-proof battery, characterized by comprising: The battery body is connected with the battery positive electrode port through a first lead wire and connected with the battery negative electrode port through a second lead wire; a three-stage power supply and current limiting circuit is further arranged between the first lead wire and the second lead wire, and the three-stage power supply and current limiting circuit comprises a first-stage power supply and current limiting circuit, a second-stage power supply and current limiting circuit and a third-stage power supply and current limiting circuit; the first-stage power supply and current limiting circuit, the second-stage power supply and current limiting circuit and the third-stage power supply and current limiting circuit are used for limiting the discharge time and discharge current of the battery body. The first-stage power supply and current limiting circuit, the second-stage power supply and current limiting circuit and the third-stage power supply and current limiting circuit have the same structure, and each of the first-stage power supply and current limiting circuit comprises a power supply circuit, a current limiting circuit, a current detection resistor and a current limiting switch, a first port of the power supply circuit is connected with the first lead wire, a second port of the power supply circuit is connected with a first port of the current limiting circuit, the current detection resistor and the current limiting switch are arranged on the second lead wire, a second port of the current limiting circuit is connected with the current detection resistor, and a third port of the current limiting circuit is connected with the current limiting switch; when the current of the current detection resistor reaches a first threshold value, the current limiting circuit makes the current limiting switch closed and latches the state of the current limiting switch. The current limiting circuit comprises a comparator, a first transistor, a first MOS tube and a second resistor; a first port of the comparator is connected with a first port of the MOS tube, a second port of the comparator is connected with a first port of the current detection resistor, a third port of the comparator is connected with a second port of the current detection resistor, the first port of the current detection resistor is connected with a second port of the MOS tube, a third port of the MOS tube is connected with a first port of the second resistor, the first port of the comparator is connected with a first port of the first transistor, a second port of the first transistor is connected with the second port of the current detection resistor, and a third port of the first transistor is connected with a second port of the second resistor.

2. The intrinsic safety type explosion-proof battery according to claim 1, wherein The intrinsically safe explosion-proof battery further comprises a first-stage protection module and a second-stage protection module, the first-stage protection module and the second-stage protection module are arranged on the second lead wire, and the first-stage protection module and the second-stage protection module are arranged between the battery body and the three-stage power supply and current limiting circuit; the first-stage protection module is used for overvoltage protection, undervoltage protection, overcurrent protection and short circuit protection of the battery, and the second-stage protection module is used for overvoltage protection, charging protection and overcurrent protection of the battery.

3. The intrinsically safe explosion-proof battery according to claim 2, characterized in that, The intrinsically safe explosion-proof battery further comprises a special charging port module, the special charging port module comprises a positive electrode charging port, a negative electrode charging port and an isolation circuit; the positive electrode charging port and the negative electrode charging port are respectively connected with a first interface of the first lead wire and a second interface of the second lead wire through the isolation circuit; the first interface is arranged between the battery body and the three-stage power supply and current limiting circuit, and the second interface is arranged between the second-stage protection module and the three-stage power supply and current limiting circuit.

4. The intrinsic safety type explosion-proof battery according to claim 3, wherein The isolation circuit comprises a first diode, a second diode and a third diode connected in sequence, the cathode of the first diode is connected with the first interface, the anode of the first diode is connected with the cathode of the second diode, the anode of the second diode is connected with the cathode of the third diode, and the anode of the third diode is connected with the positive charging port.

5. The intrinsically safe explosion-proof battery according to claim 3, characterized in that, The isolation circuit comprises a three-stage symmetrical isolation, and the three-stage symmetrical isolation circuit comprises a first symmetrical isolation circuit, a second symmetrical isolation circuit and a third symmetrical isolation circuit connected in sequence, the first symmetrical isolation circuit is connected with the first interface and the second interface, and the third symmetrical isolation circuit is connected with the positive charging port and the negative charging port.

6. The intrinsic safety type explosion-proof battery according to claim 1, wherein The intrinsically safe explosion-proof battery further comprises a current-limiting resistor, and the current-limiting resistor is arranged on the first lead wire.

7. The intrinsic safety type explosion-proof battery according to claim 1, wherein The intrinsically safe explosion-proof battery further comprises a fuse, and the fuse is arranged on the first lead wire.

8. The intrinsic safety type explosion-proof battery according to claim 1, wherein The intrinsically safe explosion-proof battery further comprises a temperature protection device, and the temperature protection device is arranged on the first lead wire or the second lead wire.

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