Lithium battery suitable for parking

Abstract

The invention relates to the technical field of new energy automobiles, in particular to a lithium battery suitable for parking. The lithium battery pack is characterized by comprising a lithium battery cell module, a charging and discharging unit, a main control unit, a positive and negative electrode temperature detection unit and a heating unit. The lithium cell module is charged or discharged through the charging and discharging unit, the main control unit obtains the charging or discharging state of the lithium cell module through the charging and discharging unit, and when the voltage of the lithium cell module is higher than the upper limit or the lower limit of a preset threshold value, the main control unit controls the charging and discharging unit to be switched off. The positive and negative electrode temperature detection unit is used for detecting the positive electrode temperature and the negative electrode temperature of the lithium cell module and transmitting temperature information to the main control unit, and when the positive electrode temperature or the negative electrode temperature of the lithium cell module is lower than a set temperature and the battery is in a charging or discharging state, the main control unit controls the heating unit to start to heat the lithium cell module. The lithium battery can be used for parking at low temperature, and is wide in application range.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, in particular to a lithium battery suitable for parking vehicles. Background Art

[0002] Currently, existing parking batteries are powered by batteries (lead-acid or gel batteries). However, these batteries have drawbacks such as high pollution and a short service life. Lithium batteries are gradually replacing parking batteries due to their high energy density, long operating time, long service life, and low pollution levels. However, due to their temperature characteristics, lithium batteries significantly degrade in low temperatures, making existing lithium batteries unsuitable for parking in such conditions. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a lithium battery suitable for parking. The lithium battery can be used for parking at low temperatures and has a wide range of uses.

[0004] To solve the above problems, the following technical solutions are provided:

[0005] The lithium battery suitable for parking of the present invention is characterized in that it includes a lithium battery cell module, a charge and discharge unit, a main control unit, a positive and negative electrode temperature detection unit and a heating unit. The lithium battery cell module is adaptively connected to the charge and discharge unit, and the lithium battery cell module is charged or discharged through the charge and discharge unit. The main control unit is adaptively connected to the charge and discharge unit, and the main control unit obtains the charge or discharge status of the lithium battery cell module through the charge and discharge unit, and when the voltage of the lithium battery cell module is higher than the upper or lower limit of the preset threshold, the main control unit controls the charge and discharge unit to shut down. The positive and negative electrode temperature detection units and the heating unit are both adaptively connected to the lithium battery cell module and the main control unit. The positive and negative electrode temperature detection units are used to detect the positive and negative electrode temperatures of the lithium battery cell module and transmit the temperature information to the main control unit. When the positive or negative electrode temperature of the lithium battery cell module is lower than the set temperature and the battery is in the charge or discharge state, the main control unit controls the heating unit to start and heat the lithium battery cell module.

[0006] The positive and negative electrode temperature detection units include a positive electrode thermistor NTC+ and a negative electrode thermistor NTC-. The positive electrode thermistor NTC+ is offset against the positive electrode column of the lithium battery module, and the negative electrode thermistor NTC- is offset against the negative electrode column of the lithium battery module. One end of the positive electrode thermistor NTC+ is connected to one end of the resistor R70 and one end of the resistor R175, respectively. The other end of the positive electrode thermistor NTC_P+ is grounded. The other end of the resistor R70 is connected to the first power supply. The other end of the resistor R175 is connected to one end of the capacitor C77, and the other end of the capacitor C77 is grounded. One end of the resistor R175 connected to the capacitor C77 forms the lithium battery module positive electrode temperature signal NTC_P+. One end of the negative electrode thermistor NTC- is respectively connected to one end of the resistor R177 and one end of the resistor R176, the other end of the positive electrode thermistor NTC_P- is grounded, the other end of the resistor R177 is connected to the first power supply, the other end of the resistor R176 is connected to one end of the capacitor C76, and the other end of the capacitor C76 is grounded; one end of the resistor R176 connected to the capacitor C76 forms the negative electrode temperature signal NTC_P- of the lithium battery module.

[0007] The heating unit includes an electric heating wire and a transistor Q84 for heating the lithium battery module; the emitter of the transistor Q84 is respectively connected to the second power supply, one end of the resistor R100, one end of the capacitor C75 and the emitter of the transistor Q50, the other end of the resistor R100 is connected to the base of the transistor Q84, the other end of the capacitor C75 is connected to the negative electrode B- of the lithium battery module, the collector of the transistor Q50 is respectively connected to one end of the resistor R10 and the cathode of the diode D22, the other end of the resistor R10 is connected to the base of the transistor Q50, and the anode of the diode D22 is connected to one end of the resistor R102, and the other end of the resistor R102 is connected to the positive electrode B+ of the lithium battery module. The base of the transistor Q84 is connected to one end of a resistor R300, the other end of which is connected to the source of an NMOS transistor Q81, the drain of which is grounded. The gate of the NMOS transistor Q81 is connected to one end of a resistor R170 and one end of a resistor R169, respectively. The other end of the resistor R170 is connected to the main control unit for receiving a heating signal HT generated by the main control unit, and the other end of the resistor R169 is grounded. The positive terminal HT+ of the electric heating wire is connected to the positive electrode B+ of the lithium battery module, and the negative terminal HT- of the electric heating wire is connected to the negative electrode B- of the lithium battery module via a switching circuit. The collector of the transistor Q84 is adapted to be connected to the switching circuit. When the main control unit generates the heating signal HT, the switching circuit is turned on, and the electric heating wire is energized and begins heating.

[0008] The switching circuit includes a resistor R179. One end of the resistor R179 is connected to the collector of the transistor Q84. The other end of the resistor R179 is connected to one end of a resistor R180 and the anode of a diode D24. The other end of the resistor R180 is connected to the base of the transistor Q85. The cathode of the diode D24 is connected to one end of a resistor R181. The other end of the resistor R181 is connected to one end of a resistor R185, one end of a resistor R182, and the emitter of the transistor Q85. The other end of the resistor R185 is connected to the gate of the NMOS transistor Q49. The other end of the resistor R182 is connected to the cathode of the diode D28, one end of the resistor R183, and the gate of the NMOS transistor Q82. The anode of the diode D28, the other end of the resistor R183, and the source of the NMOS transistor Q82 are connected to the negative electrode B- of the lithium battery module. The collector of the transistor Q85 is connected to one end of the resistor R184, and the other end of the resistor R184 is connected to the negative electrode B- of the lithium battery module; the drain of the NMOS tube Q49 and the drain of the NMOS tube Q82 are both connected to the anode of the diode D25 and the negative end HT- of the electric heating wire, the cathode of the diode D25 is connected to one end of the resistor R181, and the other end of the resistor R181 is connected to the positive electrode B+ of the lithium battery module; the source of the NMOS tube Q49 is connected to the negative electrode B- of the lithium battery module.

[0009] The drain of the NMOS transistor Q49 is connected to the cathode of the diode D30, and the source of the NMOS transistor Q49 is connected to the anode of the diode D30.

[0010] It also includes a forced start unit, which is adaptively connected to the main control unit. When the forced start unit is started, the main control unit receives a forced start signal KEY1 and controls the discharge MOS of the charge and discharge unit to be in an open state.

[0011] The forced start unit includes an external button J2, and a capacitor C19 is connected in series at both ends of the external button J2; one end of the external button J2 is connected to the cathode of the diode D14 and one end of the TVS diode D5, and the other end of the external button J2 and the other end of the TVS diode D5 are both grounded; the anode of the diode D14 is respectively connected to one end of the resistor R54 and one end of the resistor R52, the other end of the resistor R54 is connected to the first power supply, and one end of the resistor R52 is connected to the main control unit, for sending the forced start signal KEY1 to the main control unit.

[0012] The cathode of the diode D14 is connected to the cathode of the diode D27, the anode of the diode D27 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to VCC, and the anode of the diode D27 is connected to the main control unit for sending a test signal KEY_test to the main control unit.

[0013] The charge and discharge unit includes a supercapacitor module, and the positive electrode B+ of the lithium battery module is connected to the charging MOS and the discharging MOS of the charge and discharge unit through the supercapacitor module.

[0014] The above solution has the following advantages:

[0015] Because the positive and negative electrode temperature detection units of the lithium battery suitable for parking of the present invention are used to detect the positive and negative electrode temperatures of the lithium battery module and transmit the temperature information to the main control unit, when the positive or negative electrode temperature of the lithium battery module is lower than the set temperature and the battery is in the charging or discharging state, the main control unit controls the heating unit to start and heat the lithium battery module. Therefore, the lithium battery can heat the battery cells at low temperatures, thereby ensuring that the battery cells are at normal temperatures during large-scale discharge or charging. Therefore, the lithium battery can maintain its performance even in low-temperature environments, making it suitable for parking in low-temperature environments and has a wide range of uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural topology diagram of a lithium battery suitable for parking according to the present invention;

[0017] Figure 2 This is a schematic diagram of the process of heating a lithium battery suitable for parking a vehicle according to the present invention;

[0018] Figure 3 This is a circuit diagram of a main control unit in a lithium battery suitable for parking according to the present invention;

[0019] Figure 4 This is a circuit diagram of a positive and negative electrode temperature detection unit in a lithium battery suitable for parking in the present invention;

[0020] Figure 5 This is a circuit diagram of a heating unit in a lithium battery suitable for parking according to the present invention;

[0021] Figure 6 This is a circuit diagram of a forced starting unit in a lithium battery suitable for parking according to the present invention;

[0022] Figure 7 This is a circuit diagram of the chip U17 and its peripheral circuits in the lithium battery suitable for parking of the present invention;

[0023] Figure 8 This is a circuit diagram of a charging switch unit and a discharging switch unit in a lithium battery suitable for parking of the present invention;

[0024] Figure 9 This is a circuit diagram of a supercapacitor unit in a lithium battery suitable for parking according to the present invention;

[0025] Figure 10This is a circuit diagram of an active balancing unit in a lithium battery suitable for parking according to the present invention. DETAILED DESCRIPTION

[0026] The present invention is described in further detail below with reference to the accompanying drawings.

[0027] like Figure 1 As shown, the lithium battery suitable for parking of the present invention includes a lithium battery module, a charge and discharge unit, a main control unit, a positive and negative electrode temperature detection unit, a heating unit and a forced start unit. The lithium battery module is adaptively connected to the charge and discharge unit, and the lithium battery module is charged or discharged through the charge and discharge unit. The main control unit is adaptively connected to the charge and discharge unit, and the main control unit obtains the charge or discharge status of the lithium battery module through the charge and discharge unit, and when the voltage of the lithium battery module is higher than the upper or lower limit of the preset threshold, the main control unit controls the charge and discharge unit to shut down. The positive and negative electrode temperature detection unit and the heating unit are both adaptively connected to the lithium battery module and the main control unit. The positive and negative electrode temperature detection unit is used to detect the positive and negative electrode temperatures of the lithium battery module and transmit the temperature information to the main control unit. When the positive or negative electrode temperature of the lithium battery module is lower than the set temperature and the battery is in the charge or discharge state, the main control unit controls the heating unit to start and heat the lithium battery module. The forced start unit is adaptively connected to the main control unit. When the forced start unit is started, the main control unit receives the forced start signal KEY1 and controls the discharge MOS of the charge and discharge unit to be in an open state.

[0028] like Figure 3 As shown, the main control unit contains a chip U13 of model GD32E303CCT6 and peripheral circuits that drive the chip U13. These structures are as follows Figure 3 As shown, it belongs to the prior art and will not be described here.

[0029] like Figure 2As shown, the heating temperature set in this embodiment is below 0 degrees. During charging, when it is detected that a charger is connected or the charging current is greater than 2A (i.e., in the charging state), and the positive and negative temperatures of the battery module (i.e., the battery core temperature) are lower than 0 degrees, the heating unit is started, triggering the heating function. A single trigger heating lasts for 30 minutes, and the temperature is detected to be greater than 15 degrees. If the charging condition temperature (15 degrees) is not reached, the heating is started again after 30 minutes until the charging condition is met. The maximum heating temperature does not exceed 45 degrees. During discharge, when the discharge current is detected to be greater than 2A, and the positive and negative temperatures of the battery module (i.e., the battery core temperature) are lower than 0 degrees, the heating is turned on. Under continuous load conditions, the heating is continued for 30 minutes, and the temperature is detected to be greater than 5 degrees. If it is greater than 5 degrees, the heating is stopped. If the temperature is not reached, the heating function is turned on again after 30 minutes until the heating shutdown condition (temperature greater than 5 degrees) is met. It should be noted here that although the capacity of lithium batteries will be greatly reduced at low temperatures, they can still generate electricity. This electricity can provide power for weak current modules such as control units and heating units. Lithium batteries are basically unusable below -35 degrees. Therefore, this solution can be applied to environments above -35 degrees. A small low-temperature battery can also be set up to provide power to weak current modules below -35 degrees, making this solution suitable for even lower temperature environments.

[0030] like Figure 1 As shown, the main control unit is connected to a Bluetooth module unit and a 4G module unit. The connection circuit structure of the Bluetooth module unit and the 4G module unit with the chip U13 belongs to the existing technology and will not be described here. Manufacturers can set and upgrade parameters through the Bluetooth applet function, and end users can view the battery power, voltage, temperature, operating current, etc. through Bluetooth. At the same time, the charging and discharging of the lithium battery can be controlled through the applet to prevent the battery from being connected to the load for a long time and consuming too much power, resulting in serious power loss. Users can use the 4G applet to remotely view the battery's operating status, the real-time location of the device, battery fault information, etc., and can also remotely OTA upgrade the application. Under low temperature conditions in winter, the remote heating function of the applet can be used to turn on the battery for heating to avoid the problem that the vehicle cannot be started without pre-heating and still needs to wait for heating.

[0031] like Figure 3 and Figure 4As shown, the positive and negative electrode temperature detection units include a positive electrode thermistor NTC+ and a negative electrode thermistor NTC-. The positive electrode thermistor NTC+ is offset against the positive electrode column of the lithium battery module, and the negative electrode thermistor NTC- is offset against the negative electrode column of the lithium battery module. One end of the positive electrode thermistor NTC+ is connected to one end of the resistor R70 and one end of the resistor R175 respectively. The other end of the positive electrode thermistor NTC_P+ is grounded. The other end of the resistor R70 is connected to the first power supply. The other end of the resistor R175 is connected to one end of the capacitor C77, and the other end of the capacitor C77 is grounded. One end of the resistor R175 connected to the capacitor C77 is connected to the 15th pin of the chip U13, and is used to send the positive electrode temperature signal NTC_P+ of the lithium battery module to the chip U13. One end of the negative electrode thermistor NTC- is connected to one end of resistor R177 and one end of resistor R176, respectively. The other end of the positive electrode thermistor NTC_P- is grounded. The other end of resistor R177 is connected to the first power supply. The other end of resistor R176 is connected to one end of capacitor C76, and the other end of capacitor C76 is grounded. One end of resistor R176, which is connected to capacitor C76, is connected to pin 16 of chip U13 to transmit the negative electrode temperature signal NTC_P- of the lithium battery module to chip U13.

[0032] like Figure 3 and Figure 5 As shown, the heating unit includes an electric heating wire and a transistor Q84 for heating the lithium battery module. The emitter of transistor Q84 is connected to the second power supply, one end of resistor R100, one end of capacitor C75, and the emitter of transistor Q50. The other end of resistor R100 is connected to the base of transistor Q84, and the other end of capacitor C75 is connected to the negative electrode B- of the lithium battery module. The collector of transistor Q50 is connected to one end of resistor R10 and the cathode of diode D22. The other end of resistor R10 is connected to the base of transistor Q50, the anode of diode D22, and one end of resistor R102. The other end of resistor R102 is connected to the positive electrode B+ of the lithium battery module. The base of transistor Q84 is connected to one end of resistor R300, the other end of resistor R300 is connected to the source of NMOS transistor Q81, and the drain of NMOS transistor Q81 is grounded. The gate of NMOS transistor Q81 is connected to one end of resistor R170 and one end of resistor R169, respectively. The other end of resistor R170 is connected to the main control unit, that is, to pin 29 of chip U13, for receiving the heating signal HT generated by the main control unit. The other end of resistor R169 is grounded. The positive terminal HT+ of the electric heating wire is connected to the positive electrode B+ of the lithium battery module, and the negative terminal HT- of the electric heating wire is connected to the negative electrode B- of the lithium battery module through a switching circuit. The collector of transistor Q84 is adapted to connect to the switching circuit. When the main control unit generates the heating signal HT, the switching circuit is turned on, and the electric heating wire is energized and begins heating.

[0033] like Figure 5As shown, the switching circuit includes a resistor R179. One end of the resistor R179 is connected to the collector of the transistor Q84, and the other end of the resistor R179 is connected to one end of the resistor R180 and the anode of the diode D24. The other end of the resistor R180 is connected to the base of the transistor Q85. The cathode of the diode D24 is connected to one end of the resistor R181. The other end of the resistor R181 is connected to one end of the resistor R185, one end of the resistor R182, and the emitter of the transistor Q85. The other end of the resistor R185 is connected to the gate of the NMOS transistor Q49. The other end of the resistor R182 is connected to the cathode of the diode D28, one end of the resistor R183, and the gate of the NMOS transistor Q82. The anode of the diode D28, the other end of the resistor R183, and the source of the NMOS transistor Q82 are connected to the negative electrode B- of the lithium battery module. The collector of transistor Q85 is connected to one end of resistor R184, the other end of which is connected to the negative electrode B- of the lithium battery module. The drains of NMOS transistor Q49 and NMOS transistor Q82 are both connected to the anode of diode D25 and the negative terminal HT- of the electric heating wire. The cathode of diode D25 is connected to one end of resistor R181, the other end of which is connected to the positive electrode B+ of the lithium battery module. The source of NMOS transistor Q49 is connected to the negative electrode B- of the lithium battery module. The drain of NMOS transistor Q49 is connected to the cathode of diode D30, and the source of NMOS transistor Q49 is connected to the anode of diode D30.

[0034] like Figure 6 As shown, the forced start unit includes an external button J2, with capacitor C19 connected in series across both ends of external button J2. One end of external button J2 is connected to the cathode of diode D14 and one end of TVS diode D5, while the other ends of external button J2 and TVS diode D5 are both grounded. The anode of diode D14 is connected to one end of resistor R54 and one end of resistor R52, respectively. The other end of resistor R54 is connected to the first power supply. One end of resistor R52 is connected to the main control unit, namely, pin 30 of chip U13, for sending a forced start signal KEY1 to the main control unit. The cathode of diode D14 is connected to the cathode of diode D27, the anode of diode D27 is connected to one end of resistor R4, the other end of resistor R4 is connected to VCC, and the anode of diode D27 is connected to the main control unit, namely, pin 27 of chip U13, for sending a test signal KEY_test to the main control unit. The forced start unit is triggered by the external button J2 when the lithium battery is low on power. When pressed, it forces the lithium battery discharge MOS to open and maintain it for 1 minute, allowing the vehicle to be successfully ignited within this time interval. If it fails, the operation needs to be restarted.

[0035] In this embodiment, the charge and discharge unit includes a chip U17 of model SH367309, a charging switch unit, a discharging switch unit, an active balancing unit and a supercapacitor module. The positive electrode B+ of the lithium battery module is connected to the charging MOS and the discharging MOS of the charge and discharge unit through the supercapacitor module. The specific structure and connection method of the chip U17 of SH367309, the charging switch unit, the discharging switch unit, the active balancing unit and the supercapacitor module are as follows: Figure 7 、 Figure 8 、 Figure 9 and Figure 10 As shown, it belongs to the prior art and will not be described here in detail.

[0036] In this embodiment, the first power supply is a 3.3V power supply, and the second power supply is a 12V power supply. The lithium battery of this solution also includes a power conversion module. The power conversion module generates a 3.3V power supply, a 12V power supply and a VCC through the lithium battery cell module. Although the capacity will be greatly reduced, it can still generate electricity through the power conversion module to generate a 3.3V power supply, a 12V power supply and a VCC.

[0037] The lithium battery suitable for parking of the present invention can heat the battery cells at low temperatures, thereby ensuring that the battery cells are at normal temperatures when being discharged or charged in large quantities. Therefore, the lithium battery can also ensure performance in low-temperature environments, and is suitable for parking in low-temperature environments, with a wide range of uses. Furthermore, through the Bluetooth module unit, the manufacturer can set and upgrade parameters through the Bluetooth applet function, and the end user can view the battery power, voltage, temperature, operating current, etc. through Bluetooth. At the same time, the charging and discharging of the lithium battery can be controlled through the applet to turn it on and off. This prevents the battery from being connected to the load for a long time, consuming too much power and causing serious power loss. Through the 4G module unit, the user can remotely view the battery's operating status, the real-time location of the device, battery fault information, etc. through the 4G applet, and can also remotely OTA upgrade the application. Under low-temperature conditions in winter, the remote heating function of the applet can be used to turn on the battery for heating, so as to avoid the problem that the vehicle cannot be started without being heated in advance and still needs to wait for heating.

Claims

1. A lithium battery suitable for parking, characterized in that: It includes a lithium battery cell module, a charge and discharge unit, a main control unit, a positive and negative electrode temperature detection unit and a heating unit; the lithium battery cell module is adaptively connected to the charge and discharge unit, and the lithium battery cell module is charged or discharged through the charge and discharge unit; the main control unit is adaptively connected to the charge and discharge unit, and the main control unit obtains the charge or discharge status of the lithium battery cell module through the charge and discharge unit, and when the voltage of the lithium battery cell module is higher than the upper limit or lower limit of the preset threshold, the main control unit controls the charge and discharge unit to shut down; the positive and negative electrode temperature detection units and the heating unit are both adaptively connected to the lithium battery cell module and the main control unit, the positive and negative electrode temperature detection units are used to detect the positive electrode temperature and the negative electrode temperature of the lithium battery cell module, and transmit the temperature information to the main control unit, when the positive electrode temperature or the negative electrode temperature of the lithium battery cell module is lower than the set temperature and the battery is in the charging or discharging state, the main control unit controls the heating unit to start and heat the lithium battery cell module.

2. The lithium battery suitable for parking according to claim 1, characterized in that: The positive and negative electrode temperature detection units include a positive electrode thermistor NTC+ and a negative electrode thermistor NTC-, the positive electrode thermistor NTC+ is offset against the positive electrode column of the lithium battery module, and the negative electrode thermistor NTC- is offset against the negative electrode column of the lithium battery module; one end of the positive electrode thermistor NTC+ is respectively connected to one end of the resistor R70 and one end of the resistor R175, the other end of the positive electrode thermistor NTC_P+ is grounded, the other end of the resistor R70 is connected to the first power supply, the other end of the resistor R175 is connected to one end of the capacitor C77, and the other end of the capacitor C77 is connected to the first power supply. end is grounded; one end of the resistor R175 connected to the capacitor C77 forms the positive electrode temperature signal NTC_P+ of the lithium battery module; one end of the negative electrode thermistor NTC- is respectively connected to one end of the resistor R177 and one end of the resistor R176, the other end of the positive electrode thermistor NTC_P- is grounded, the other end of the resistor R177 is connected to the first power supply, the other end of the resistor R176 is connected to one end of the capacitor C76, and the other end of the capacitor C76 is grounded; one end of the resistor R176 connected to the capacitor C76 forms the negative electrode temperature signal NTC_P- of the lithium battery module.

3. The lithium battery suitable for parking as claimed in claim 1, characterized in that: The heating unit includes an electric heating wire and a transistor Q84 for heating the lithium battery module; the emitter of the transistor Q84 is respectively connected to the second power supply, one end of the resistor R100, one end of the capacitor C75 and the emitter of the transistor Q50, the other end of the resistor R100 is connected to the base of the transistor Q84, the other end of the capacitor C75 is connected to the negative electrode B- of the lithium battery module, the collector of the transistor Q50 is respectively connected to one end of the resistor R10 and the cathode of the diode D22, the other end of the resistor R10 is connected to the base of the transistor Q50, and the anode of the diode D22 is connected to one end of the resistor R102, the other end of the resistor R102 is connected to the positive electrode B+ of the lithium battery module; the base of the transistor Q84 is connected to the resistor R100. One end of the resistor R300 is connected to the source of the NMOS tube Q81, and the drain of the NMOS tube Q81 is grounded; the gate of the NMOS tube Q81 is respectively connected to one end of the resistor R170 and one end of the resistor R169, the other end of the resistor R170 is connected to the main control unit for receiving the heating signal HT generated by the main control unit, and the other end of the resistor R169 is grounded; the positive end HT+ of the electric heating wire is connected to the positive electrode B+ of the lithium battery core module, and the negative end HT- of the electric heating wire is connected to the negative electrode B- of the lithium battery core module through a switching circuit, and the collector of the transistor Q84 is adapted to be connected to the switching circuit. When the main control unit generates the heating signal HT, the switching circuit is turned on, and the electric heating wire is energized and starts heating.

4. The lithium battery suitable for parking as claimed in claim 3, characterized in that: The switch circuit includes a resistor R179; one end of the resistor R179 is connected to the collector of the transistor Q84, the other end of the resistor R179 is respectively connected to one end of the resistor R180 and the anode of the diode D24, the other end of the resistor R180 is connected to the base of the transistor Q85, the cathode of the diode D24 is connected to one end of the resistor R181, the other end of the resistor R181 is respectively connected to one end of the resistor R185, one end of the resistor R182 and the emitter of the transistor Q85, the other end of the resistor R185 is connected to the gate of the NMOS transistor Q49, the other end of the resistor R182 is respectively connected to the cathode of the diode D28, one end of the resistor R183 and the emitter of the NMOS transistor Q82 The gate of the transistor Q49 is connected to the gate of the transistor D25, the anode of the diode D28, the other end of the resistor R183 and the source of the NMOS transistor Q82 are connected to the negative electrode B- of the lithium battery module; the collector of the transistor Q85 is connected to one end of the resistor R184, and the other end of the resistor R184 is connected to the negative electrode B- of the lithium battery module; the drain of the NMOS transistor Q49 and the drain of the NMOS transistor Q82 are both connected to the anode of the diode D25 and the negative end HT- of the electric heating wire, the cathode of the diode D25 is connected to one end of the resistor R181, and the other end of the resistor R181 is connected to the positive electrode B+ of the lithium battery module; the source of the NMOS transistor Q49 is connected to the negative electrode B- of the lithium battery module.

5. The lithium battery suitable for parking as claimed in claim 4, characterized in that: The drain of the NMOS transistor Q49 is connected to the cathode of the diode D30, and the source of the NMOS transistor Q49 is connected to the anode of the diode D30.

6. The lithium battery suitable for parking as claimed in claim 1, characterized in that: It also includes a forced start unit, which is adaptively connected to the main control unit. When the forced start unit is started, the main control unit receives a forced start signal KEY1 and controls the discharge MOS of the charge and discharge unit to be in an open state.

7. The lithium battery suitable for parking according to claim 6, characterized in that: The forced start unit includes an external button J2, and a capacitor C19 is connected in series at both ends of the external button J2; one end of the external button J2 is connected to the cathode of the diode D14 and one end of the TVS diode D5, and the other end of the external button J2 and the other end of the TVS diode D5 are both grounded; the anode of the diode D14 is respectively connected to one end of the resistor R54 and one end of the resistor R52, the other end of the resistor R54 is connected to the first power supply, and one end of the resistor R52 is connected to the main control unit, for sending the forced start signal KEY1 to the main control unit.

8. The lithium battery suitable for parking as claimed in claim 7, characterized in that: The cathode of the diode D14 is connected to the cathode of the diode D27, the anode of the diode D27 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to VCC, and the anode of the diode D27 is connected to the main control unit for sending a test signal KEY_test to the main control unit.

9. The lithium battery suitable for parking as claimed in claim 1, characterized in that: The charge and discharge unit includes a supercapacitor module, and the positive electrode B+ of the lithium battery module is connected to the charging MOS and the discharging MOS of the charge and discharge unit through the supercapacitor module.

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