A low-temperature self-heating device for a lithium-ion battery boxed emergency power supply

Abstract

The present invention discloses a low-temperature self-heating device for a lithium-ion battery boxed emergency power supply, which includes a low-temperature infrared radiation graphene electrothermal film, a lithium-ion battery pack, an emergency power supply box, a temperature detection probe, and an automatic heating device. The low-temperature infrared radiation graphene electrothermal film, the lithium-ion battery pack, the emergency power supply box, the temperature detection probe, and the automatic heating device are electrically connected. The automatic heating device is provided with a circuit to control the low-temperature infrared radiation graphene electrothermal film. The present invention can well protect the lithium-ion battery pack from being affected by temperature during use, and can ensure that the temperature of the emergency power supply box will not be lower than minus 20 degrees Celsius whether in the power-off charging state or the emergency discharging state.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ions, and particularly to a low-temperature self-heating device for a lithium-ion battery boxed emergency power supply. Background Art

[0002] A lithium-ion battery is a battery using a lithium metal or lithium alloy as a positive or negative electrode material and a non-aqueous electrolyte solution. The charging and discharging process of a lithium battery mainly relies on the movement of lithium ions (Li+) between the positive and negative electrodes. During charging, lithium ions are deintercalated from the positive electrode, pass through the electrolyte, and are embedded in the negative electrode, and the negative electrode is in a lithium-rich state; during discharging, the opposite occurs. The electrolyte inside the lithium-ion battery plays a role in conducting ions between the positive and negative electrodes of the lithium battery. A low viscosity of the electrolyte can play a certain role in the movement of lithium ions, while a high viscosity will form a certain internal resistance, thereby preventing the movement of lithium ions. The preheating of the lithium battery is due to the fact that under low-temperature conditions, the viscosity of the electrolyte inside the battery will increase with the change of temperature, resulting in a decline in the charge and discharge performance of the battery. Therefore, in order to make the viscosity of the electrolyte inside the battery meet the usage requirements of the emergency power supply, it is necessary to preheat the battery. However, according to the characteristics of lithium batteries, below -20 degrees Celsius, lithium electrons may be frozen, resulting in the inability to charge or provide electrical energy. In extremely cold conditions, heating the lithium battery in advance can ensure the normal operation of the lithium battery in actual emergencies. Summary of the Invention

[0003] The purpose of the present invention is to provide a low-temperature self-heating device for a lithium-ion battery boxed emergency power supply.

[0004] To achieve the above purpose, the present invention is realized through such a technical solution. A low-temperature self-heating device for a lithium-ion battery boxed emergency power supply includes a low-temperature infrared radiation graphene heating film, a lithium-ion battery pack, an emergency power supply box, a temperature detection probe, and an automatic heating device. The low-temperature infrared radiation graphene heating film, the lithium-ion battery pack, the emergency power supply box, the temperature detection probe, and the automatic heating device are electrically connected, and the automatic heating device is provided with a circuit to control the low-temperature infrared radiation graphene heating film.

[0005] Further, the circuit includes a battery, resistor one, resistor two, capacitor one, voltage reference source, resistor three, chip, resistor four, capacitor two, resistor five, resistor six, resistor seven, resistor eight, resistor nine, analog output one, analog output two, MOS transistor, relay, and capacitor three.

[0006] Further, the battery is sequentially connected to the upper end of resistor one, the upper end of capacitor three, the upper end of resistor eight, the upper end of the MOS transistor, and the upper end of the relay. The lower end of resistor one is respectively connected to the right end of resistor two, the upper end of the voltage reference source, and the upper end of capacitor one. The left end of resistor two is connected to the left end of the voltage reference source. The left end of resistor two is also connected to the upper end of resistor three. The lower end of resistor three is connected to the lower end of the voltage reference source and the lower end of capacitor one. The lower end of resistor three is also respectively connected to pin 1, pin 2, pin 3, pin 4, the capacitor, and the ground terminal of the chip. At the connection point of resistor two and capacitor one, a 5V voltage is transferred. At the right end of capacitor two, a 5V voltage is transferred. Pin 8, pin 7, pin 6, and pin 5 of the chip are respectively connected to the upper end of resistor four, the left end of resistor five, the left end of resistor six, and the left end of the resistor. At the connection point of resistor four and the chip, a 5V voltage is transferred. The lower end of resistor four is also respectively connected to the left end of resistor five and the left end of analog output one. Pin 6 of the chip is also connected to pin 1 of the temperature detection probe. Pin 2 of the temperature detection probe is connected to the ground terminal. The lower end of capacitor three is respectively connected to the right end of resistor five, pin 6 of the chip, the left end of the resistor, and the upper end of resistor seven. The right end of resistor six is connected to the right end of the resistor and a 5V voltage is transferred at the connection point. The left end of pin 5 of the chip and the left end of the resistor are also commonly connected to the upper end of resistor seven. The lower end of resistor seven is connected to the ground terminal. The lower end of resistor eight is respectively connected to the upper end of analog output one, the left end of analog output two, and the upper end of resistor nine. The lower ends of analog output one and resistor nine are both connected to the ground terminal. The lower end of the MOS transistor and the lower end of the relay are commonly connected to the upper end of analog output two. The lower end of analog output two is connected to the ground terminal. The relay is also connected to the AC live wire and pin 1 of the temperature control switch. Pin 2 of the temperature control switch is connected to pin 1 of the low-temperature infrared radiation graphene electrothermal film. Pin 2 of the low-temperature infrared radiation graphene electrothermal film is connected to the AC neutral wire.

[0007] Further, the chip contains a comparator.

[0008] Further, the voltage reference source, the comparator, and the temperature detection probe form a temperature detection circuit.

[0009] Further, analog output two, analog output one, the MOS transistor, the relay, and the temperature control switch form a heating control circuit.

[0010] Further, the low-temperature infrared radiation graphene electrothermal film forms a heating circuit.

[0011] Further, the temperature control switch is a normally closed switch at 45 degrees Celsius.

[0012] Further, the low-temperature infrared radiation graphene electrothermal film is a planar electric heating element with a sheet-like structure and a relatively thin thickness, and it is composed of a pure resistive heating material, metal electrodes, and an outer covering of electrically insulating material.

[0013] The beneficial effects of the above solution are :

[0014] 1. The invention can automatically start the heating device inside the emergency power supply box when the temperature is below -20°C, and the temperature of the lithium battery will work within the set range.

[0015] 2. When the temperature of the present invention is lower than minus twenty degrees Celsius, the heating device will be automatically started, and when the temperature inside the emergency power supply box reaches fifty degrees Celsius, the heating device will be turned off.

[0016] 3. It can well protect the lithium-ion battery pack from being affected by temperature and becoming ineffective during use.

[0017] 4. Whether in the power-off charging state or emergency discharge, the temperature inside the emergency power supply box remains not lower than minus twenty degrees Celsius. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the main structure of the present invention;

[0019] Figure 2 is a schematic diagram of the circuit in the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0020] The present invention will be further clearly and completely described below in conjunction with the accompanying drawings of the specification, but the protection scope of the present invention is not limited thereto.

[0021] Example 1:

[0022] As Figures 1 to 2 shown, a low-temperature self-heating device for an emergency power supply of a lithium-ion battery pack includes a low-temperature infrared radiation graphene heating film J7, a lithium-ion battery pack 2, an emergency power supply box 3, a temperature detection probe J6, and an automatic heating device 5. The low-temperature infrared radiation graphene heating film J7, the lithium-ion battery pack 2, the emergency power supply box 3, the temperature detection probe J6, and the automatic heating device 5 are electrically connected, and the automatic heating device 5 is provided with a circuit to control the low-temperature infrared radiation graphene heating film J7.

[0023] Among them, the circuit includes a battery BAT, a resistor R94, a resistor R51, a capacitor C36, a voltage reference source U12, a resistor R52, a chip LM393, a resistor R9, a capacitor C37, a resistor R97, a resistor R93, a resistor R95, a resistor R98, a resistor R92, an analog output AO3400Q18, an analog output AO3400Q17, a MOS transistor D28M7, a relay S2, and a capacitor C38.

[0024] Among them, the battery BAT is sequentially connected to the upper end of resistor R94, the upper end of capacitor C38, the upper end of resistor R98, the upper end of MOS transistor D28M7, and the upper end of relay S2. The lower end of resistor R94 is respectively connected to the right end of resistor R51, the upper end of voltage reference source U12, and the upper end of capacitor C36. The left end of resistor R51 is connected to the left end of voltage reference source U12. The left end of resistor R51 is also connected to the upper end of resistor R52. The lower end of resistor R52 is connected to the lower end of voltage reference source U12 and the lower end of capacitor C36. The lower end of resistor R52 is also respectively connected to pin 1, pin 2, pin 3, pin 4, capacitor C37, and ground terminal GND of chip LM393. At the connection point of resistor R51 and capacitor C36, a 5V voltage is transferred. At the right end of capacitor C37, a 5V voltage is transferred. Pins 8, 7, 6, and 5 of chip LM393 are respectively connected to the upper end of resistor R91, the left end of resistor R97, the left end of resistor R93, and the left end of resistor R96. At the connection point of resistor R91 and chip LM393, a 5V voltage is transferred. The lower end of resistor R91 is also respectively connected to the left end of resistor R97 and the left end of analog output AO3400Q18. Pin 6 of chip LM393 is also connected to pin 1 of temperature detection probe J6. Pin 2 of temperature detection probe J6 is connected to ground terminal GND. The lower end of capacitor C38 is respectively connected to the right end of resistor R97, pin 6 of chip LM393, the left end of resistor R96, and the upper end of resistor R95. The right end of resistor R93 is connected to the right end of resistor R96 and a 5V voltage is transferred at the connection point. The pin 5 of chip LM393 and the left end of resistor R96 also jointly connect to the upper end of resistor R95. The lower end of resistor R95 is connected to ground terminal GND. The lower end of resistor R98 is respectively connected to the upper end of analog output AO3400Q18, the left end of analog output AO3400Q17, and the upper end of resistor R92. The lower ends of analog output AO3400Q18 and resistor R92 are both connected to ground terminal GND. The lower end of MOS transistor D28M7 and the lower end of relay S2 jointly connect to the upper end of analog output AO3400Q17. The lower end of analog output AO3400Q17 is connected to ground terminal GND. Relay S2 is also connected to the AC live wire ACL and pin 1 of temperature control switch J8. Pin 2 of temperature control switch J8 is connected to pin 1 of low-temperature infrared radiation graphene heating film J7. Pin 2 of low-temperature infrared radiation graphene heating film J7 is connected to the AC neutral wire ACN.

[0025] Among them, the chip LM393 contains a comparator U11.

[0026] Among them, the voltage reference source U12, the comparator U11, and the temperature detection probe J6 constitute a temperature detection circuit.

[0027] Among them, the analog output two AO3400Q17, the analog output one AO3400Q18, the MOS transistor D28M7, the relay S2, and the temperature control switch J8 constitute a heating control circuit.

[0028] Among them, the low-temperature infrared radiation graphene electric heating film J7 constitutes a heating circuit.

[0029] Among them, the temperature control switch J8 is a normally closed switch at 45 degrees Celsius.

[0030] Among them, the low-temperature infrared radiation graphene electric heating film J7 is a planar electric heating element with a sheet-like structure and a relatively thin thickness. It is composed of a pure resistive heating material, metal electrodes, and an outer electrical insulation material. The low-temperature infrared radiation graphene electric heating film J7 can achieve electro-thermal conversion. In addition, it has a thin-film structure and a heating body with uniform surface heating. The temperature can be accurately controlled within the range of -20 degrees Celsius to 50 degrees Celsius, with a positive and negative temperature difference of 1 degree Celsius.

[0031] Working principle:

[0032] When the temperature detection circuit detects that the ambient temperature in the emergency power supply box 3 is lower than -20 degrees Celsius, the heating control circuit drives the relay S2 to close, and the low-temperature infrared radiation graphene electric heating film J7 is powered on and starts heating. When the temperature detection circuit detects that the ambient temperature rises to about 15 degrees Celsius, the heating control circuit disconnects the relay S2, and the low-temperature infrared radiation graphene electric heating film J7 is powered off and stops heating, and works in this way repeatedly; when the temperature detection circuit fails, the temperature control switch J8 has a protection function to prevent the low-temperature infrared radiation graphene electric heating film J7 from continuing to heat (the protection temperature is about 50 degrees Celsius).

[0033] The embodiments disclosed in the present invention are preferred embodiments, but are not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A low-temperature self-heating device for a lithium-ion battery box emergency power supply, characterized in that: It includes a low-temperature infrared radiation graphene electrothermal film (J7), a lithium-ion battery pack (2), an emergency power supply box (3), a temperature detection probe (J6), and an automatic heating device (5). The low-temperature infrared radiation graphene electrothermal film (J7), the lithium-ion battery pack (2), the emergency power supply box (3), the temperature detection probe (J6), and the automatic heating device (5) are electrically connected. A circuit is provided on the automatic heating device (5) to control the low-temperature infrared radiation graphene electrothermal film (J7); The circuit includes a battery (BAT), a resistor one (R94), a resistor two (R51), a capacitor one (C36), a voltage reference source (U12), a resistor three (R52), a chip, a resistor four (R91), a capacitor two (C37), a resistor five (R97), a resistor six (R93), a resistor seven (R95), a resistor eight (R98), a resistor nine (R92), an analog output one, an analog output two, a MOS transistor, a relay (S2), and a capacitor three (C38); The battery is successively connected to the upper end of resistor one (R94), the upper end of capacitor three (C38), the upper end of resistor eight (R98), the upper end of the MOS transistor, and the upper end of relay (S2). The lower end of resistor one (R94) is respectively connected to the right end of resistor two (R51), the upper end of voltage reference source (U12), and the upper end of capacitor one (C36). The left end of resistor two (R51) is connected to the left end of voltage reference source (U12). The left end of resistor two (R51) is also connected to the upper end of resistor three (R52). The lower end of resistor three (R52) is connected to the lower end of voltage reference source (U12) and the lower end of capacitor one (C36). The lower end of resistor three (R52) is also respectively connected to pin 1, pin 2, pin 3, pin 4, capacitor two (C37), and ground terminal (GND) of the chip. At the connection point of resistor two (R51) and capacitor one (C36), 5V voltage is transferred. At the right end of capacitor two (C37), 5V voltage is transferred. Pin 8, pin 7, pin 6, and pin 5 of the chip are respectively connected to the upper end of resistor four (R91), the left end of resistor five (R97), the left end of resistor six (R93), and the left end of resistor (R96). At the connection point of resistor four (R91) and the chip, 5V voltage is transferred. The lower end of resistor four (R91) is also respectively connected to the left end of resistor five (R97) and the left end of analog output one. Pin 6 of the chip is also connected to pin 1 of temperature detection probe (J6). Pin 2 of temperature detection probe (J6) is connected to ground terminal (GND). The lower end of capacitor three (C38) is respectively connected to the right end of resistor five (R97), pin 6 of the chip, the left end of resistor (R96), and the upper end of resistor seven (R95). The right end of resistor six (R93) is connected to the right end of resistor (R96) and 5V voltage is transferred at the connection point. Pin 5 of the chip and the left end of resistor (R96) are also commonly connected to the upper end of resistor seven (R95). The lower end of resistor seven (R95) is connected to ground terminal (GND). The lower end of resistor eight (R98) is respectively connected to the upper end of analog output one, the left end of analog output two, and the upper end of resistor nine (R92). The lower ends of both analog output one and resistor nine (R92) are connected to ground terminal (GND). The lower end of the MOS transistor and the lower end of relay (S2) are commonly connected to the upper end of analog output two. The lower end of analog output two is connected to ground terminal (GND). Relay (S2) is also connected to alternating current live wire (ACL) and pin 1 of temperature control switch (J8). Pin 2 of temperature control switch (J) is connected to pin 1 of low-temperature infrared radiation graphene electrothermal film (J7). Pin 2 of low-temperature infrared radiation graphene electrothermal film (J7) is connected to alternating current neutral wire (ACN); The chip contains a comparator (U11); Analog output two, analog output one, the MOS transistor, relay (S2), and temperature control switch (J8) constitute a heating control circuit; The low-temperature infrared radiation graphene electrothermal film (J7) constitutes a heating circuit.

2. The low-temperature self-heating device for a lithium-ion battery boxed emergency power supply according to claim 1, wherein: The voltage reference source (U12), comparator (U11), and temperature detection probe (J6) constitute a temperature detection circuit.

3. The low-temperature self-heating device for a lithium-ion battery boxed emergency power supply according to claim 1, characterized in that: The temperature control switch (J8) is a normally closed switch at 45 degrees Celsius.

4. The low-temperature self-heating device for the lithium-ion battery boxed emergency power supply according to claim 1, wherein: The low-temperature infrared radiation graphene electric heating film (J7) is a planar electric heating element with a sheet-like structure and a relatively thin thickness, and it is composed of a pure resistive heating material, metal electrodes, and an outer electrical insulation material.

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