Cold start system and electric vehicle

Abstract

The utility model discloses a cold start system and an electric vehicle. The cold start system comprises a main energy supply module, a conversion module, a pulse module and a start energy supply module. The main energy supply module is used for providing a first electric signal; the conversion module is electrically connected with the main energy supply module and used for converting the first electric signal into a second electric signal, and the voltage value of the second electric signal is smaller than that of the first electric signal; the pulse module is electrically connected with the conversion module and is used for converting the second electric signal into a pulse signal; and the starting energy supply module is electrically connected with the pulse module, is used for receiving the pulse signal and can work under the action of the pulse signal. On the basis, the cold start system can greatly improve the cold start capability of the start energy supply module.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a cold start system and an electric vehicle. Background Art

[0002] In cold weather, electric vehicles face the problem of being unable to start and breaking down. This is mainly because as the temperature decreases, the internal resistance of the low-voltage battery increases, and the cold start power of the 12V starting power supply drops sharply, making it unable to operate.

[0003] In related solutions, a heating film is used to heat the low-voltage battery to improve its cold start ability. However, the heating speed of the heating film is very slow, and it consumes the power of the 12V starting power supply, which will further reduce its cold start ability. Therefore, there is an urgent need to provide a solution that can quickly start an electric vehicle at low temperatures. Utility Model Content

[0004] Based on this, in view of the above technical problems, it is necessary to provide a cold start system and an electric vehicle. The cold start system can convert the high-voltage signal provided by the main energy supply module into a low-voltage signal and then into a pulse signal, and the pulse signal can quickly supply power to the starting energy supply module to quickly improve the cold start ability of the starting energy supply module.

[0005] In a first aspect, this application provides a cold start system, including:

[0006] A main energy supply module for providing a first electrical signal;

[0007] A conversion module electrically connected to the main energy supply module. The conversion module is used to convert the first electrical signal into a second electrical signal, and the voltage value of the second electrical signal is less than the voltage value of the first electrical signal;

[0008] A pulse module electrically connected to the conversion module. The pulse module is used to convert the second electrical signal into a pulse signal;

[0009] A starting energy supply module electrically connected to the pulse module. The starting energy supply module is used to receive the pulse signal and can operate under the action of the pulse signal.

[0010] In one embodiment, the pulse module includes:

[0011] A switch control module electrically connected to the conversion module. The switch control module is used to switch between a closed state and an open state to convert and output the second electrical signal as the pulse signal;

[0012] A rectifying and filtering module electrically connected to the switch control module. The rectifying and filtering module is used to adjust the waveform of the pulse signal; and

[0013] A current limiting module, electrically connected to the rectifying and filtering module, is configured to control the current parameter of the pulse signal so that the current voltage of the starting power supply module does not exceed the upper limit voltage.

[0014] In one embodiment, the switch control module is configured to control the frequency of the pulse signal to be between 100 Hz and 1500 Hz.

[0015] In one embodiment, the switch control module is configured to control the duty cycle of the pulse signal to be between 1:5 and 1:1.

[0016] In one embodiment, the rectifying and filtering module is configured to adjust the pulse signal into a sine wave pulse signal, a triangular wave pulse signal, a square wave pulse signal, or a rectangular pulse signal.

[0017] In one embodiment, the rectifying and filtering module is configured to filter the reverse discharge pulse current signal when the starting power supply module is in a charging state;

[0018] The rectifying and filtering module is further configured to filter the forward charging pulse current signal when the starting power supply module is in a fully charged state.

[0019] In one embodiment, the current limiting module is configured to control the current parameter of the pulse signal so that the current multiple of the starting power supply module is between 3C and 10C.

[0020] In one embodiment, the cold start system further includes:

[0021] A power distribution module, one end of which is electrically connected to the main power supply module, and the other end of which is electrically connected to the conversion module. The power distribution module is configured to distribute the electrical signal provided by the main power supply module to the conversion module.

[0022] In a second aspect, the present application further provides an electric vehicle, including the cold start system as described above.

[0023] In one embodiment, the electric vehicle further includes:

[0024] A starting device, electrically connected to the starting power supply module, is configured to operate under the action of the electrical signal provided by the starting power supply module; and

[0025] A power device, electrically connected to the main power supply module, provides power for the electric vehicle under the action of the main power supply module.

[0026] Based on the above description, the conversion module of the cold start system of the present application can convert the high-voltage first electrical signal provided by the main energy supply module into a low-voltage second electrical signal that can adapt to the starting energy supply module, and the pulse module can convert the second electrical signal into a pulse signal and charge the starting energy supply module. Since the pulse signal has a large current, the large-current pulse signal can not only quickly charge the starting energy supply module and increase the SOC value of the starting energy supply module, but also increase the temperature of the starting energy supply module in a short time. The solution of the present application can greatly improve the cold start capability of the starting energy supply module.

[0027] Furthermore, the cold start system of the present application can utilize the main energy supply module of the high-voltage power battery module of the electric vehicle to charge the starting energy supply module. The cold start system does not need to rely on an external power supply, which can greatly improve the applicability of the cold start system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A first structural schematic diagram of a cold start system provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram comparing the cold start capabilities of the cold start system provided in the embodiment of the present application and the heating film heating solution of the related art;

[0030] Figure 3 A schematic diagram of the structure of a pulse module provided in an embodiment of the present application;

[0031] Figure 4 Schematic diagrams of several waveforms of pulse signals formed by the pulse module provided in the embodiments of the present application;

[0032] Figure 5 A second structural schematic diagram of the cold start system provided in an embodiment of the present application;

[0033] Figure 6 A schematic diagram of the first structure of an electric vehicle provided in an embodiment of the present application;

[0034] Figure 7 A second structural schematic diagram of the electric vehicle provided in an embodiment of the present application.

[0035] The reference numerals in the embodiments of the present application are described as follows:

[0036] 10. Electric vehicle; 100. Cold start system; 200. Starting device; 300. Power device; 110. Main energy supply module; 120. Conversion module; 130. Pulse module; 140. Starting energy supply module; 150. Power distribution module; 131. Switch control module; 132. Rectification and filtering module; 133. Current limiting module. DETAILED DESCRIPTION

[0037] The following will describe the technical solutions in the present application clearly and completely in conjunction with the accompanying drawings Figure 1 to Figure 7 and embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0038] Referring to "embodiments" herein means that the specific features, structures or characteristics described in conjunction with the embodiments can be included in at least one embodiment of the present application. The phrase may not necessarily refer to the same embodiment at various positions in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0039] The following will be described in detail with specific embodiments. It should be noted that the embodiments of the present application can be presented in various forms, and some examples will be described below.

[0040] In the field of electric vehicles, electric vehicles still face the problem that the vehicle cannot start due to too low ambient temperature. This is mainly because as the temperature decreases, the internal resistance of the 12V starting power supply in the electric vehicle increases, and the cold start (the cold start of the vehicle refers to the situation where the power supply is directly started without preheating) power of the 12V starting power supply drops sharply, so that it cannot operate. One solution in the related art is to use a heating film to heat the 12V starting power supply to improve its cold start ability; however, the heating speed of using the heating film is very slow, and it consumes the power of the 12V starting power supply, which will further reduce its cold start ability. Another solution in the related art is to improve the remaining power (State of Charge, abbreviated as SOC) of the 12V starting power supply by directly charging the 12V starting power supply, so as to improve the cold start ability of the battery; however, to prevent the 12V starting power supply from lithium plating (lithium plating is a loss condition of lithium-ion batteries, which occurs during the charging process. When lithium ions are removed from the positive electrode and move to the negative electrode, if the lithium-inserting space of the negative electrode is insufficient, or the resistance of lithium ions inserting into the negative electrode is too large, or the lithium ions are removed from the positive electrode too quickly and cannot be inserted into the negative electrode equally, these lithium ions that cannot be inserted into the negative electrode will gain electrons on the surface of the negative electrode to form metallic lithium, that is, so-called lithium plating), the charging current of the 12V starting power supply at low temperature is very small, and it takes a long time to increase the SOC of the battery and improve the cold start ability.

[0041] In view of the problem that the 12V starting power supply in the related art cannot quickly improve the cold start ability, this application proposes a cold start system 100, which can quickly and safely improve the cold start ability of the 12V starting power supply through a pulse signal.

[0042] Specifically, please refer to Figure 1 , Figure 1 which is the first structural schematic diagram of the cold start system 100 provided by the embodiment of this application. The cold start system 100 includes a main power supply module 110, a conversion module 120, a pulse module 130, and a starting power supply module 140.

[0043] The main power supply module 110 is used to provide a first electrical signal. The conversion module 120 is electrically connected to the main power supply module 110. The conversion module 120 is used to convert the first electrical signal into a second electrical signal. The voltage value of the second electrical signal is less than that of the first electrical signal, and the second electrical signal can be a low-voltage DC signal. The pulse module 130 is electrically connected to the conversion module 120. The pulse module 130 is used to convert the second electrical signal into a pulse signal. The starting power supply module 140 is electrically connected to the pulse module 130. The starting power supply module 140 is used to receive the pulse signal transmitted by the pulse module 130 and can operate under the action of the pulse signal. Here, the operation mainly refers to the state where the starting power supply module 140 can output at a specific power condition.

[0044] It can be understood that the first electrical signal provided by the main power supply module 110 can be a high-voltage DC signal, and the main power supply module 110 can be, but is not limited to, a high-voltage power battery module. The second electrical signal converted by the conversion module 120 can be a low-voltage DC signal, and the conversion module 120 can be a DC-DC converter. Among them, the voltage value of the second electrical signal can be within the input voltage range required by the starting power supply module 140, and the conversion module 120 can convert the high-voltage signal provided by the main power supply module 110 into the low-voltage signal required by the starting power supply module 140. For example, in some embodiments, the main power supply module 110 can provide a high-voltage signal of 400 volts (V) to 800V (such as 400V, 600V, or 800V), the starting power supply module 140 can be a 12V starting power supply, and the DC-DC converter can convert the high-voltage signal of 400V to 800V into a low-voltage signal of 9V to 16V (such as 9V, 10V, 12V, 14V, or 16V), so that the main power supply module 110 can provide energy for the 12V starting power supply (i.e., the starting power supply module 140) and charge the 12V starting power supply (i.e., the starting power supply module 140).

[0045] It can be understood that the pulse signal provided by the pulse module 130 is a discrete signal, which is continuously emitted at a certain voltage amplitude and at a certain time interval. The time interval between two adjacent pulse signals is called a period; the number of pulses generated within a unit time (such as 1 second) is called a frequency. In the embodiment of the present application, the pulse module 130 converts low-voltage direct current into a pulse signal. Due to the periodic characteristics of the pulse signal, the pulse module 130 can provide a pulse signal in the form of a large current and supply power to the starting energy supply module 140. Thus, the pulse module 130 can not only charge the starting energy supply module 140 in a short time, but also increase the temperature of the starting energy supply module 140 in a short time, greatly improving the cold start performance of the starting energy supply module 140.

[0046] It can be understood that the starting energy supply module 140 is the main module for the cold start of the electric vehicle 10. At low temperatures, due to the relatively large internal resistance of the starting energy supply module 140, the output of a specific power condition cannot be achieved, so that the starting energy supply module 140 cannot start. However, the low-temperature pulse charging scheme of the embodiment of the present application can increase the temperature of the starting energy supply module 140 in a short time, and its temperature rise speed is 5 to 10 times that of the heating film heating scheme (such as 5 times, 6 times, 7 times, 8 times, 9 times or 10 times). Moreover, the low-temperature pulse charging scheme of the present application can also quickly increase the SOC of the starting energy supply module 140.

[0047] Exemplarily, please refer to Figure 2 , Figure 2 , which is a schematic diagram comparing the cold start capabilities of the cold start system 100 provided by the embodiment of the present application and the heating film heating method in the related art. As Figure 2 can be seen, in the scheme of the cold start system 100 of the present application for supplying power to the starting energy supply module 140 through a pulse signal, the cold start time required for the starting energy supply module 140 at -30°C is about 3 to 5 minutes (such as 3 minutes, 4 minutes or 5 minutes), and the cold start time required for the starting energy supply module 140 at -40°C is about 10 to 20 minutes (such as 10 minutes, 15 minutes or 20 minutes). For the heating film heating scheme in the related art, the cold start time required for the starting energy supply module 140 at -30°C is about 30 to 60 minutes (such as 30 minutes, 40 minutes, 50 minutes or 60 minutes), and the starting energy supply module 140 can basically not start at -40°C. By comparing the two schemes, it can be clearly seen that the method of charging the starting energy supply module 140 through a pulse signal in the present application can greatly improve the cold start ability of the starting energy supply module 140.

[0048] It can be understood that, in some embodiments, the main energy supply module 110, the conversion module 120 and the starting energy supply module 140 of the present application can all be structures of the electric vehicle 10. The cold start system 100 is applied to the electric vehicle 10, and the cold start system 100 of the present application can reuse the main energy supply module 110, the conversion module 120 and the starting energy supply module 140 of the electric vehicle 10. Among them, the main energy supply module 110, as a high-voltage power battery module, can provide energy for the power devices such as the motor and engine of the electric vehicle 10 (such as the power device 300 described later), and can also charge the starting energy supply module 140 of the cold start system 100. The conversion module 120 converts the high-voltage signal provided by the main energy supply module 110 into a low-voltage signal, which can provide energy for other modules of the electric vehicle 10, and can also provide energy for the starting energy supply module 140 of the cold start system 100. The starting energy supply module 140 can supply power to the low-voltage starting system of the electric vehicle 10 , and can also be charged by the main energy supply module 110 as a component of the cold starting system 100 .

[0049] In the cold start system 100 of the embodiment of the present application, the conversion module 120 can convert the high-voltage first signal provided by the main energy supply module 110 into a second electrical signal that can adapt to the low voltage of the starting energy supply module 140, and the pulse module 130 can convert the second electrical signal into a pulse signal and charge the starting energy supply module 140. Since the pulse signal can have a large current, the large-current pulse signal can not only quickly charge the starting energy supply module 140 and increase the SOC value of the starting energy supply module 140, but also increase the temperature of the starting energy supply module 140 in a short time, which can greatly improve the cold start capability of the starting energy supply module 140. In addition, the cold start system 100 of the present application can use the main energy supply module 110 of the high-voltage power battery module of the electric vehicle 10 to charge the starting energy supply module 140. The cold start system 100 does not need to rely on an external power supply, which greatly improves the applicability of the cold start system 100.

[0050] Please combine Figure 1 Please also refer to Figure 3 , Figure 3 A schematic diagram of the structure of the pulse module 130 provided in the embodiment of the present application. The pulse module 130 includes a switch control module 131 , a rectifier and filter module 132 and a current limiting module 133 .

[0051] The switch control module 131 is electrically connected to the conversion module 120. The switch control module 131 is used to switch between a closed state and an open state to convert and output the second electrical signal into a pulse signal. When the switch control module 131 is in the closed state, it can conduct the path where it is located. When the switch control module 131 is in the open state, it can disconnect the path where it is located. The rectification and filtering module 132 is electrically connected to the switch control module 131. The rectification and filtering module 132 is used to tune the waveform of the pulse signal. The current limiting module 133 is electrically connected to the rectification and filtering module 132. The current limiting module 133 is used to control the current parameter of the pulse signal so that the current voltage of the starting power supply module 140 does not exceed the upper limit voltage.

[0052] It can be understood that the switch control module 131 is electrically connected to the conversion module 120 and receives the second electrical signal transmitted by the conversion module 120. The switch control module 131 includes a switch circuit and a control circuit. The control circuit can control the closing and opening of the switch circuit to convert and output the second electrical signal into a pulse signal. Moreover, by controlling the frequency of the closing and opening of the switch circuit, the control circuit can affect the frequency of the pulse signal. Among them, in some embodiments, the switch control module 131 can control the frequency of the pulse current to be between 100 Hertz (HZ) and 1500 HZ. Further, the frequency of the pulse current can be controlled between 300 HZ and 900 HZ. For example, the switch control module 131 can control the frequency of the pulse current to be 100 HZ, 300 HZ, 500 HZ, 700 HZ, or 900 HZ. In the embodiment of the present application, the switch control module 131 controls the frequency of the pulse signal, and the pulse module 130 can form a continuous high-frequency pulse current, which can not only quickly charge the starting power supply module 140 but also avoid lithium plating during low-temperature charging of the starting power supply module 140.

[0053] It can be understood that the control circuit can also control the interval duration of the closing and opening of the switch circuit to control the duty cycle of the pulse signal. The duty cycle of the pulse signal refers to the proportion of the closing duration (also the conducting duration) of the switch circuit in the total period (a pulse period). Among them, in some embodiments, the switch control module 131 can control the duty cycle of the pulse signal to be between 1:5 and 1:1. For example, the switch control module 131 can control the duty cycle of the pulse signal to be 1:1, 1:2, 1:3, 1:4, or 1:5. In the embodiment of the present application, the switch control module 131 controls the duty cycle of the pulse signal, and the pulse module 130 is more likely to form a continuous high-frequency pulse current.

[0054] It can be understood that the rectification and filtering module 132 can be, but is not limited to, a rectification / filtering module, and the rectification and filtering module 132 can adjust the waveform of the pulse signal. Among them, the rectification and filtering module 132 can finely adjust a specific waveform (such as the amplitude of the waveform). For example, when the pulse signal output by the pulse module 130 is a sine wave pulse signal, the rectification and filtering module 132 can adjust the pulse amplitude of the sine wave pulse signal. Among them, the rectification and filtering module 132 can also integrate waveform transformation circuits such as an amplification unit and a differential operation unit, so that the rectification and filtering module 132 can also adjust the waveform of the pulse signal. For example, in some embodiments, please refer to Figure 4 , Figure 4 which are several waveform schematic diagrams of the pulse signal formed by the pulse module 130 provided in the embodiments of the present application. As Figure 4 shown in the (a) diagram of Figure 4 , the rectification and filtering module 132 adjusts the pulse signal to a sine wave pulse signal under the action of the waveform transformation circuit; or, as Figure 4 shown in the (b) diagram of Figure 4 , the rectification and filtering module 132 adjusts the pulse signal to a triangular wave pulse signal under the action of the waveform transformation circuit; or, as Figure 4 shown in the (c) diagram of Figure 4 , the rectification and filtering module 132 adjusts the pulse signal to a square wave pulse signal under the action of the waveform transformation circuit; or, as Figure 4 shown in the (d) diagram of Figure 4 , the rectification and filtering module 132 adjusts the pulse signal to a rectangular pulse signal under the action of the waveform transformation circuit. When the pulse signal is a sine wave pulse signal, the magnitude of the current of the pulse signal can change slowly, and the current of the pulse signal is easier to control. When the pulse signal is a triangular wave pulse signal, the pulse signal can rise to the highest point in an extremely short time, greatly improving the efficiency of the pulse signal for supplying power to the starting power supply module 140. When the pulse signal is a square wave pulse signal or a rectangular pulse signal, the amplitude of the pulse signal remains constant throughout the cycle, the waveform is stable, and the charging of the starting power supply module 140 by the pulse signal is more stable.

[0055] Among them, in some embodiments, when the power of the starting power supply module 140 is relatively low (for example, the SOC of the starting power supply module 140 is less than or equal to 30%) and it can be in the charging state, the rectification and filtering module 132 can also filter the reverse discharge pulse current signal when the starting power supply module 140 is in the charging state. For example, Figure 4 the several pulse signals shown in Figure 4 are all pulse signals after filtering the reverse discharge pulse current signal. It can be understood that when the control circuit controls the switch circuit to be disconnected, the pulse module 130 does not charge the starting power supply module 140. At this time, the starting power supply module 140 may discharge in the reverse direction under the action of the disconnected switch circuit and generate a discharge pulse current signal, and the rectification and filtering module 132 of the embodiments of the present application filters the reverse discharge pulse current signal, which can prevent the starting power supply module 140 from discharging and causing its SOC to drop.

[0056] Among them, in some other embodiments, the rectifying and filtering module 132 can also filter the forward charging pulse current signal when the starting power supply module 140 is fully charged (at this time, the waveform diagram of the pulse signal can be opposite to the waveform diagram shown in Figure 4 ). It can be understood that although some starting power supply modules 140 are fully charged in low-temperature or extremely low-temperature scenarios (the SOC of the starting power supply module 140 is 100%), they still cannot be started. In the embodiments of the present application, under the action of the rectifying and filtering module 132, the pulse module 130 can filter out the forward charging pulse signal, so that the starting power supply module 140 generates a reverse discharge pulse signal. During this process, the reverse discharge pulse signal will heat the starting power supply module 140, which can improve the cold start ability of the starting power supply module 140.

[0057] It can be understood that the current limiting module 133 can include, but is not limited to, components such as resistors, diodes, triodes, and current transformers. The current limiting module 133 is used to control the current parameters of the pulse signal to prevent the current voltage of the starting power supply module 140 from exceeding its upper limit charging voltage. And when the current voltage of the starting power supply module 140 is less than its upper limit charging voltage, the current limiting module 133 can also make the current multiple of the starting power supply module 140 between 3C and 10C. For example, the current multiple of the starting power supply module 140 can be 3C, 4C, 5C, 6C, 7C, 8C, 9C, 10C. In the related art, in the scheme of charging the starting power supply module 140 with direct current, in order to prevent lithium plating, the current multiple of the current is generally limited to less than 0.1C, and the current is small, resulting in a too slow charging rate of direct current. However, in the present application, the starting power supply module 140 is charged with a pulse signal, and the current multiple of the starting power supply module 140 can be as high as 3C to 10C, and further can be as high as 5C to 10C. For example, the current multiple of the starting power supply module 140 can be 5C, 6C, 7C, 8C, 9C, 10C. The scheme of the embodiments of the present application can greatly improve the charging rate, increase the temperature of the starting power supply module 140, and improve the low-temperature cold start ability of the starting power supply module 140. As the SOC of the starting power supply module 140 increases, the charging current of the pulse signal needs to be reduced to prevent the current voltage of the starting power supply module 140 from exceeding the upper limit charging voltage of the starting power supply module 140.

[0058] The pulse module 130 of the embodiments of the present application can, through the mutual cooperation of the switch control module 131, the rectifying and filtering module 132, and the current limiting module 133, limit parameters such as the frequency, duty cycle, waveform, and current magnitude of the pulse signal, so that the pulse signal can better charge and heat the starting power supply module 140, greatly improving the cold start ability of the starting power supply module 140.

[0059] Among them, please refer toFigure 5 , Figure 5 The second structural diagram of the cold start system 100 provided in the embodiment of the present application. The cold start system 100 further includes a power distribution module 150 .

[0060] One end of the distribution module 150 is electrically connected to the main energy supply module 110, and the other end of the distribution module 150 is electrically connected to the conversion module 120. The distribution module 150 is used to distribute the electrical signal provided by the main energy supply module 110 to the conversion module 120. In some embodiments, the distribution module 150 may be a high-voltage distribution box, and the distribution module 150 may be responsible for the power distribution and management of the main power supply module. Through the high-voltage distribution box, the electrical energy of the main power supply module can be transmitted to the conversion module 120.

[0061] It is understandable that the power distribution module 150 can distribute a portion of the electric energy of the main energy supply module 110 to the conversion module 120 to form a pulse signal and charge the startup energy supply module 140. In other embodiments, the power distribution module 150 can also distribute other electric energy of the main energy supply module 110 to other modules, for example, to the power device 300 such as the generator and motor of the electric vehicle 10.

[0062] It is understandable that the power distribution module 150 can be an existing component in the electric vehicle 10, that is, the cold start system 100 of the present application can reuse the existing components in the electric vehicle 10, and the structure of the cold start system 100 is simpler and the production cost is also simpler.

[0063] The cold start system 100 of the embodiment of the present application includes a power distribution module 150, which can manage and distribute the electric energy of the main energy supply module 110 to meet the power requirements of different modules.

[0064] Based on the structure of the above-mentioned cold start system 100, the cold start system 100 of the embodiment of the present application can solve the bottleneck of low-voltage batteries such as 12V starting power supplies in extremely cold regions, and can further promote the development of new energy vehicles. Compared with the heating film heating scheme and the DC charging scheme of the prior art, the cold start system 100 of the present application adopts a pulse charging method, which can increase the charging current of the 12V starting power supply (i.e., the starting energy supply module 140) at low temperatures by more than dozens of times, and then can quickly increase the temperature and SOC of the 12V starting power supply, thereby improving the cold start capability of the 12V starting power supply. In addition, the cold start system 100 of the present application can use the main energy supply module 110 of the high-voltage power battery module of the electric vehicle 10 to charge the starting energy supply module 140, and the cold start system 100 does not need to rely on an external power supply, which greatly improves the applicability of the cold start system 100.

[0065] Based on the above cold start system 100, please refer to Figure 6 ,Figure 6 This is the first structural schematic diagram of the electric vehicle 10 provided by the embodiments of the present application. The embodiments of the present application also provide an electric vehicle 10, including the cold start system 100 of any of the above embodiments. The cold start system 100 can convert the high-voltage signal provided by the main energy supply module 110 into a low-voltage signal through the conversion module 120 and then into a pulse signal through the pulse module 130, and finally charge the start energy supply module 140 through the pulse signal to improve the cold start ability of the start energy supply module 140.

[0066] Among them, please refer to Figure 7 , Figure 7 This is the second structural schematic diagram of the electric vehicle 10 provided by the embodiments of the present application. The electric vehicle 10 may further include a starting device 200 and a power device 300.

[0067] The starting device 200 is electrically connected to the start energy supply module 140, and the starting device 200 is configured to operate under the action of the electric energy provided by the start energy supply module 140. Among them, the starting device 200 may be an in-vehicle electronic system of the electric vehicle 10, including at least one of the in-vehicle entertainment system, lighting system, and dashboard system. The start energy supply module 140, such as a 12V starting power supply, can provide electric energy for systems such as the in-vehicle entertainment system, lighting system, and dashboard system. Among them, the starting device 200 further includes a starting system of the power device 300. The main energy supply module 110 (i.e., the power battery) of a new energy vehicle does not directly act on the power device 300 for vehicle starting. Instead, the start energy supply module 140 is often used to supply power to the starting system of the power device 300, and then the main energy supply module 110 acts on the power device 300 to start the engine or activate the motor.

[0068] The power device 300 is electrically connected to at least one of the main energy supply module 110 and the power distribution module 150. The power device 300 provides power for the electric vehicle 10 under the action of the main energy supply module 110. Among them, the power device 300 may be an engine or a motor of the electric vehicle 10. Among them, in some embodiments, the main energy supply module 110 may be directly electrically connected to the power device 300 and supply power to it. In other embodiments, the power device 300 may also be electrically connected to the power distribution module 150, and the power distribution module 150 can reasonably distribute the electric energy of the main energy supply module 110 to the power device 300. In still other embodiments, the power device 300 may be electrically connected to both the main energy supply module 110 and the power distribution module 150. The embodiments of the present application do not limit this.

[0069] It can be understood that the main energy supply module 110, the power distribution module 150, the conversion module 120 and the starting energy supply module 140 of the present application can all be structures of the electric vehicle 10. The main energy supply module 110, as a high-voltage power battery module, can provide energy for the power device 300 such as the motor and engine of the electric vehicle 10, and can also charge the starting energy supply module 140 of the cold start system 100. The power distribution module 150 can distribute the electric energy of the main energy supply module 110 to the conversion module 120 and use it to realize the cold start function of the starting energy supply module 140, and the power distribution module 150 can also distribute the electric energy of the main energy supply module 110 to the power device 300 to realize the starting of the electric vehicle 10. The conversion module 120 converts the high-voltage signal provided by the main energy supply module 110 into a low-voltage signal, which can provide energy for other modules of the electric vehicle 10, and can also provide energy for the starting energy supply module 140 of the cold start system 100. The starting energy supply module 140 can function as a low-voltage starting system of the electric vehicle 10 , and can also be a component of the cold starting system 100 to receive charging from the main energy supply module 110 .

[0070] It should be noted that the above is only an exemplary description of the electric vehicle 10 provided in the embodiment of the present application, and the electric vehicle 10 may also include other components, such as but not limited to a frame, tires, a dashboard, a steering wheel, a main control system, etc. This application will not elaborate on them here.

[0071] The electric vehicle 10 of the embodiment of the present application can use the main energy supply module 110 of the high-voltage power battery module of the electric vehicle 10 to pulse charge the starting energy supply module 140, which can quickly improve the cold start capability of the starting energy supply module 140, and can achieve the cold start of the electric vehicle 10 at ultra-low temperatures. In addition, compared with the heating film solution, the solution of the present application is safer. At the same time, the cold start system 100 of the present application does not need to rely on an external power supply, which greatly improves the applicability of the cold start system 100 and makes the operation of the electric vehicle 10 smoother.

[0072] It should be understood that, in the description of this application, terms such as "first", "second", etc. are only used to distinguish similar objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0073] It is understandable that those skilled in the art can combine various implementations in the above embodiments under the guidance of the above embodiments to obtain technical solutions of multiple implementations. The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0074] The cold start system and electric vehicle provided by the present application have been introduced in detail above. Specific examples are used in this text to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the present application. At the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A cold start system, characterized in that: include: A main energy supply module, used for providing a first electrical signal; a conversion module, electrically connected to the main energy supply module, and configured to convert the first electrical signal into a second electrical signal, wherein a voltage value of the second electrical signal is smaller than a voltage value of the first electrical signal; a pulse module, electrically connected to the conversion module, and configured to convert the second electrical signal into a pulse signal; A starting energy supply module is electrically connected to the pulse module, and the starting energy supply module is used to receive the pulse signal and can work under the action of the pulse signal.

2. The cold start system according to claim 1, characterized in that: The pulse module comprises: a switch control module, electrically connected to the conversion module, the switch control module being used to switch between a closed state and an open state to convert the second electrical signal into the pulse signal; a rectifier and filter module, electrically connected to the switch control module, and configured to adjust the waveform of the pulse signal; and A current limiting module is electrically connected to the rectifying and filtering module, and is used to control the current parameter of the pulse signal so that the current voltage of the starting energy supply module does not exceed an upper limit voltage.

3. The cold start system according to claim 2, characterized in that: The switch control module is used to control the frequency of the pulse signal to be between 100 Hz and 1500 Hz.

4. The cold start system according to claim 2, characterized in that: The switch control module is used to control the duty cycle of the pulse signal to be between 1:5 and 1:

1.

5. The cold start system according to claim 2, characterized in that: The rectification and filtering module is used to adjust the pulse signal to be a sine wave pulse signal, a triangle wave pulse signal, a square wave pulse signal, or a rectangular pulse signal.

6. The cold start system according to claim 2, characterized in that: The rectification and filtering module is used to filter the reverse discharge pulse current signal when the starting energy supply module is in the charging state; The rectification and filtering module is also used to filter the positive charging pulse current signal when the starting energy supply module is in a fully charged state.

7. The cold start system according to claim 2, characterized in that: The current limiting module is used to control the current parameter of the pulse signal so that the current ratio of the starting energy supply module is between 3C and 10C.

8. The cold start system according to any one of claims 1 to 7, characterized in that: The cold start system also includes: A power distribution module, one end of which is electrically connected to the main energy supply module, and the other end of which is electrically connected to the conversion module, and the power distribution module is used to distribute the electrical signal provided by the main energy supply module to the conversion module.

9. An electric vehicle, characterized in that: Comprising a cold start system as claimed in any one of claims 1 to 8.

10. The electric vehicle according to claim 9, characterized in that: The electric vehicle further comprises: a starting device, electrically connected to the starting energy supply module, the starting device being used to work under the action of an electrical signal provided by the starting energy supply module; and A power device is electrically connected to the main energy supply module, and the power device provides power for the electric vehicle under the action of the main energy supply module.

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