Multi-vehicle battery heating method and battery heating system

Abstract

The application discloses a multi-vehicle battery heating method and a battery heating system, and the multi-vehicle battery heating method comprises the following steps: when the number of vehicles in a charging state is not less than 2, detecting the temperature parameter and the power parameter of the vehicle-mounted battery in the vehicle being charged; performing a charging action on the vehicle-mounted battery according to the temperature parameter and the power parameter; and stopping charging after all the vehicle-mounted batteries are fully charged. Compared with the prior art, the application solves the charging congestion problem when multiple vehicles are charged simultaneously by detecting the temperature parameter and the power parameter of the vehicle-mounted battery, and optimizes the charging strategy of the charging station.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of charging of vehicle-mounted batteries, and in particular to a multi-vehicle battery heating method and a battery heating system. BACKGROUND

[0002] With the seriousness of pollution, countries around the world have vigorously developed electric vehicle technology. Electric vehicles on the road often choose fast charging when supplementing electric energy. However, the performance of the battery is greatly related to the ambient temperature. When charging at low temperature, the battery is prone to lithium precipitation, which seriously affects the charging rate of the lithium battery and further affects the charging experience of the user.

[0003] The charging time of electric vehicle users is relatively free and cannot be predicted. During the charging peak period, the slow charging rate will result in a large number of vehicles near the fast charging station and road congestion, affecting traffic.

[0004] Therefore, how to design a multi-vehicle battery heating method and a battery heating system to improve charging efficiency is a technical problem to be solved in the industry. SUMMARY

[0005] In view of the problem in the prior art that the charging rate of the vehicle-mounted battery is slow, resulting in a large number of vehicles, road congestion, and affecting traffic, the present application provides a multi-vehicle battery heating method and a battery heating system.

[0006] The technical scheme of the present application is to provide a multi-vehicle battery heating method, comprising:

[0007] When the number of vehicles in the charging state is not less than 2, the temperature parameter and the power parameter of the vehicle-mounted battery in the charging state are detected;

[0008] According to the temperature parameter and the power parameter, the charging action is performed on the vehicle-mounted battery;

[0009] After all the vehicle-mounted batteries are charged, the charging is stopped.

[0010] Further, according to the temperature parameter and the power parameter, the charging action is performed on the vehicle-mounted battery, comprising:

[0011] Selecting the vehicle-mounted battery with a temperature parameter lower than a first preset temperature;

[0012] Setting the charging time sequence of the vehicle-mounted battery according to the power parameter;

[0013] According to the charging time sequence, the charging action is performed on the vehicle-mounted battery.

[0014] Further, the power parameter is the remaining power of the vehicle-mounted battery, and the charging time sequence of the vehicle-mounted battery is set according to the power parameter, comprising:

[0015] acquire the residual capacity of all the vehicle batteries;

[0016] set the charging sequence according to the residual capacity of the vehicle batteries from low to high.

[0017] Further, the charging action on the vehicle battery includes:

[0018] when the temperature of the vehicle battery is lower than the first preset temperature, set the charging mode of the vehicle battery as the pulse heating mode;

[0019] when the temperature of the vehicle battery rises to the second preset temperature, set the charging mode of the vehicle battery as the super charging mode;

[0020] when the residual capacity of the vehicle battery reaches the preset capacity, stop charging.

[0021] Further, when the temperature parameter of the vehicle battery is detected to be between the first preset temperature and the second preset temperature, the multi-vehicle battery heating method further includes:

[0022] detect whether there is another vehicle battery in the pulse heating mode;

[0023] if not, set the currently detected vehicle battery as the pulse heating mode, pulse heat it, and switch to the super charging mode when its temperature is higher than the second preset temperature;

[0024] otherwise, perform slow charging on the currently detected vehicle battery through the charging pile, and set the currently detected vehicle battery as the pulse heating mode after the pulse heating of the other vehicle batteries is completed.

[0025] Further, when the number of vehicles in the charging state is 1, the multi-vehicle battery heating method further includes:

[0026] detect the temperature parameter of the vehicle battery in the charging vehicle;

[0027] determine whether the temperature parameter of the vehicle battery is greater than the second preset temperature, and if so, set the charging mode of the vehicle battery as the super charging mode;

[0028] otherwise, set the charging mode of the vehicle battery as the pulse heating mode, and switch to the super charging mode when the temperature of the vehicle battery rises to the second preset temperature.

[0029] The application also provides a battery heating system using the above multi-vehicle battery heating method, which includes:

[0030] a charging pile, the charging pile has a plurality of charging interfaces, and each charging interface is connected with a vehicle battery for super charging the vehicle battery;

[0031] a heating energy storage module connected between the charging interface and the vehicle battery and capable of pulse heating the vehicle battery.

[0032] Further, the battery heating system further comprises a first switch for controlling the on-off state of the charging interface and the vehicle battery, and a second switch for controlling the on-off state of the heating energy storage module and the vehicle battery, and the battery heating system is capable of adjusting the on-off state of the first switch and the second switch to make the vehicle battery in a pulse heating mode or an overcharging mode.

[0033] Further, when the first switch is closed and the second switch is opened, the battery heating system is in the overcharging mode.

[0034] When the first switch is opened and the second switch is closed, the battery heating system is in the pulse heating mode.

[0035] Further, the heating energy storage module comprises an energy storage battery and a DC / DC circuit connected to the energy storage battery.

[0036] The DC / DC circuit comprises a transformer, a first full-bridge circuit connected to the primary side of the transformer, and a second full-bridge circuit connected to the secondary side of the transformer, and the heating energy storage module is capable of pulse heating the vehicle battery by adjusting the on-off state of the switch tube in the first full-bridge circuit and the second full-bridge circuit.

[0037] Compared with the prior art, the present application has at least the following beneficial effects:

[0038] 1. The present application solves the charging congestion problem when multiple vehicles are charging at the same time by detecting the temperature information and the power information of the vehicle battery, and optimizes the charging strategy of the charging station.

[0039] 2. The present application adds a heating energy storage module to the original charging station for energy exchange to the vehicle battery, so that the vehicle battery itself can generate heat, avoiding the problem of lithium precipitation in the battery and improving the charging efficiency.

[0040] 3. The present application has multiple charging interfaces, which can simultaneously pulse heat or overcharge the vehicle batteries of multiple vehicles, improving resource utilization. BRIEF DESCRIPTION OF DRAWINGS

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a connection diagram of the battery heating system of the present invention;

[0043] Figure 2 A schematic diagram illustrating a scenario where multiple vehicles are being charged.

[0044] Figure 3 A flowchart for charging vehicle batteries;

[0045] Figure 4 This is a schematic diagram of the operation of the battery heating system in a preferred embodiment;

[0046] Figure 5 This is a flowchart illustrating the charging process of the on-board battery in another embodiment;

[0047] Figure 6 This is a connection diagram of a DC / DC circuit. Detailed Implementation

[0048] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0049] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the invention, and does not imply that every embodiment of the invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0050] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0051] Electric vehicle users have relatively flexible and unpredictable charging times. During peak charging periods, slower charging rates can lead to heavy traffic congestion near charging stations. This invention addresses this issue by proposing a multi-vehicle battery heating method. By using temperature and battery level parameters, the charging actions of the onboard battery are set, optimizing the charging strategy, improving charging efficiency, and resolving the congestion problem caused by multiple vehicles charging simultaneously.

[0052] Specifically, the multi-vehicle battery heating method comprises the following steps.

[0053] When the number of vehicles in the charging state is not less than 2, detecting the temperature parameter and the power parameter of the vehicle-mounted battery in the charging vehicle;

[0054] According to the temperature parameter and the power parameter, performing a charging action on the vehicle-mounted battery;

[0055] After all the vehicle-mounted batteries are fully charged, stopping the charging.

[0056] The temperature parameter is the temperature of the vehicle-mounted battery, and the power parameter is the percentage of the remaining power of the vehicle-mounted battery in the total power (SOC parameter). The charging action is performed according to the temperature parameter and the power parameter, which can reasonably allocate the charging time sequence of the multiple vehicle-mounted batteries and improve the resource utilization rate, thereby solving the charging congestion problem.

[0057] The charging action performed on the vehicle-mounted battery according to the temperature parameter and the power parameter comprises the following steps.

[0058] Selecting the vehicle-mounted battery with a temperature parameter lower than a first preset temperature;

[0059] According to the power parameter, setting the charging time sequence of the vehicle-mounted battery;

[0060] According to the charging time sequence, performing a charging action on the vehicle-mounted battery.

[0061] Please refer to Figure 3 Since the battery is prone to lithium precipitation during low-temperature charging, which affects the rate of the battery, the second preset temperature is set to prevent lithium precipitation, and the first preset temperature is set to facilitate the allocation of the charging time sequence of the multiple vehicle-mounted batteries. The first preset temperature is lower than the second preset temperature. According to the relationship between the first preset temperature and the second preset temperature, different charging strategies are set for the vehicle-mounted battery lower than the first preset temperature and the vehicle-mounted battery between the first preset temperature and the second preset temperature, thereby improving the resource utilization rate.

[0062] For the vehicle-mounted battery with a temperature parameter lower than the first preset temperature, the charging time sequence of the vehicle-mounted battery is set according to the power parameter, which comprises the following steps.

[0063] Obtaining the remaining power of all the vehicle-mounted batteries;

[0064] According to the order from low to high of the remaining power of the vehicle-mounted batteries, setting the charging time sequence.

[0065] Further, the charging action performed on the vehicle-mounted battery comprises the following steps.

[0066] When the temperature of the vehicle-mounted battery is lower than a first preset temperature, set the charging mode of the vehicle-mounted battery as a pulse heating mode;

[0067] When the temperature of the vehicle-mounted battery rises to a second preset temperature, set the charging mode of the vehicle-mounted battery as an overcharge mode;

[0068] When the remaining power of the vehicle-mounted battery reaches a preset power, stop charging.

[0069] The pulse heating mode is used for preheating the vehicle-mounted battery, the overcharge mode directly charges the vehicle-mounted battery through a charging pile, the charging speed is relatively fast, the vehicle-mounted battery is preheated through the pulse heating mode to the second preset temperature, so that the lithium precipitation phenomenon of the battery can be avoided, and after the second preset temperature is reached, the overcharge mode is switched to, so that the charging rate of the vehicle-mounted battery can be improved, and the problem of vehicle congestion can be avoided. Since the charging speed in the pulse heating mode is very fast, the investment in a single vehicle-mounted battery is extremely short, so the low-temperature problem of the vehicle-mounted battery can be quickly solved, the charging pile can charge multiple vehicle-mounted batteries at the same time, and therefore after the vehicle-mounted battery reaches the second preset temperature, the overcharge mode is switched to, so that the charging pile resources can be used to the greatest extent, and the charging efficiency can be improved.

[0070] Since the lower the remaining power of the vehicle-mounted battery, the higher the demand for charging, the charging time sequence of the vehicle-mounted battery set in the application is set from low to high according to the remaining power of the vehicle-mounted battery.

[0071] Please refer to 3, the overall working process of the application is:

[0072] Step 102: Real-time monitoring of temperature information and SOC information of the power battery;

[0073] Step 104: Determine whether the battery temperature is lower than a first preset temperature;

[0074] Step 106: Charge the vehicle with the smallest SOC amount min{SOC 1……i};

[0075] Step 108: Start the pulse heating mode for the vehicle-mounted battery with less power;

[0076] Step 110: Determine whether the battery temperature is greater than a second preset temperature;

[0077] Step 112: Start the overcharge mode for the charging pile.

[0078] In the step 102, the power battery is the vehicle-mounted battery, the temperature information is the temperature parameter, and the SOC information is the power parameter. The application first samples the temperature parameter and the power parameter of the vehicle-mounted battery. In the step 104, it is determined whether the temperature parameter is lower than the first preset temperature. Only when the determination condition of the step 104 is met, the step 106 is entered, that is, the vehicle-mounted battery with the temperature parameter lower than the first preset temperature is selected, and the vehicle with the minimum power is obtained through the step 106. Here, min{SOC 1……i} is the action of selecting the vehicle-mounted battery with the minimum residual power. After the vehicle-mounted battery with the minimum residual power is determined, the vehicle-mounted battery is pulse-heated through the step 108 to increase the temperature and avoid lithium precipitation. In the process of pulse-heating the vehicle-mounted battery, the step 110 is performed to determine whether the temperature of the vehicle-mounted battery reaches the second preset temperature. Only when the temperature of the vehicle-mounted battery reaches the second preset temperature, the vehicle-mounted battery enters the super-charging mode, that is, the step 112.

[0079] In addition, for the vehicle-mounted battery with the temperature between the first preset temperature and the second preset temperature, the multi-vehicle battery heating method of the application further includes:

[0080] detecting whether there is another vehicle-mounted battery in the pulse-heating mode;

[0081] if not, setting the currently detected vehicle-mounted battery to the pulse-heating mode and pulse-heating it, and switching it to the super-charging mode when the temperature parameter is higher than the second preset temperature;

[0082] if yes, slowly charging the currently detected vehicle-mounted battery by the charging pile, and setting it to the pulse-heating mode when it is detected that there is no vehicle for pulse-heating.

[0083] For the vehicle-mounted battery with the temperature between the first preset temperature and the second preset temperature, it only needs partial heat to execute the super-charging mode, and the demand for heating is relatively low. Therefore, when it is detected that there is another vehicle-mounted battery in the pulse-heating mode, the application can first slowly charge the currently detected vehicle-mounted battery, let the vehicle-mounted battery in the pulse-heating mode complete the heating, and after the pulse-heating of the vehicle-mounted battery is completed, that is, when it is detected that there is no vehicle for pulse-heating, set the currently detected vehicle-mounted battery to the pulse-heating mode. Since the charging speed in the pulse-heating mode is very fast, the investment in a single vehicle-mounted battery is extremely short. By using this control mode, frequent operation of the relay can be avoided, and the charging resources can be used to the maximum extent.

[0084] For the vehicle-mounted battery whose temperature is between the first preset temperature and the second preset temperature, only part of heat is needed to execute the super-charging mode, so in the present application, when it is detected that other vehicle-mounted batteries are in the pulse-heating mode, the pulse-heating mode of the other vehicle-mounted batteries is stopped, and the currently detected vehicle-mounted battery is set to the pulse-heating mode, which can reach the second preset temperature at a faster speed, so as to enter the super-charging mode, in this way, it can be determined that all vehicle-mounted batteries can enter the super-charging mode in the fastest time.

[0085] Please refer to Figure 5 The workflow in this embodiment is as follows:

[0086] Step 202: the battery temperature is greater than the first preset temperature but less than the second preset temperature;

[0087] Step 204: detecting whether other vehicles are in the pulse-heating mode;

[0088] Step 206: starting the pulse-heating mode;

[0089] Step 207: performing normal charging;

[0090] Step 208: judging whether the battery temperature is greater than the second preset temperature;

[0091] Step 210: the charging pile starts the super-charging mode.

[0092] In step 202, the temperature of the vehicle-mounted battery is judged, and only when the temperature of the vehicle-mounted battery is between the first preset temperature and the second preset temperature, step 204 is entered, in which it is detected whether other vehicle-mounted batteries of other vehicles are in the pulse-heating mode, and according to the detection result, step 206 and step 207 are set, if it is detected that no other vehicle-mounted batteries are in the pulse-heating mode, step 206 is entered, in which the pulse-heating mode is started for the currently detected vehicle-mounted battery, if it is detected that other vehicle-mounted batteries are in the pulse-heating mode, step 207 is entered, since other vehicle-mounted batteries are in the pulse-charging mode at this time, the currently detected vehicle-mounted battery is charged by the charging pile, and after the pulse-heating of the other vehicle-mounted batteries is completed, step 209 is executed, in which the currently detected vehicle-mounted battery is set to the pulse-heating mode, and after step 206, step 208 is executed, in which it is judged whether the battery temperature is greater than the second preset temperature, and only when the temperature of the vehicle-mounted battery is greater than the second preset temperature, step 210 is entered, in which the super-charging mode is started for the vehicle-mounted battery.

[0093] According to the setting of the first preset temperature, the present application is respectively provided with Figure 3 , Figure 5The control flow in two different cases optimizes the charging of the multi-vehicle charging vehicle, greatly improves the resource utilization, and solves the charging congestion problem that may occur when multiple vehicles are charging at the same time.

[0094] Further, for the case where the charging state of the vehicle is 1, the application also provides a corresponding control strategy, which includes:

[0095] detecting the temperature parameter of the on-board battery in the vehicle being charged;

[0096] determining whether the temperature parameter of the on-board battery is greater than a second preset temperature, and if so, setting the charging mode of the on-board battery to an overcharge mode;

[0097] otherwise, set the charging mode of the on-board battery to a pulse heating mode, and when the temperature of the on-board battery rises to the second preset temperature, switch to the overcharge mode.

[0098] Since the vehicle currently being charged is only 1, the charging timing problem between multiple vehicles does not need to be considered, so in this embodiment, only the temperature parameter of the on-board battery needs to be detected, and the first preset temperature does not need to be considered. Only the charging mode of the on-board battery is adjusted according to whether the temperature of the on-board battery is greater than the second preset temperature, and in this way, the lithium precipitation phenomenon of the on-board battery can be completely avoided.

[0099] Further, the application also provides a battery heating system which adopts the above-mentioned multi-vehicle battery heating method, and the battery heating system comprises:

[0100] a charging pile, the charging pile has a plurality of charging interfaces, and each charging interface is connected to an on-board battery for overcharge charging of the on-board battery;

[0101] a heating energy storage module connected between the charging interface and the on-board battery and capable of pulse heating the on-board battery.

[0102] Further, the battery heating system further comprises a first switching switch for controlling the on-off state of the charging interface and the on-board battery, and a second switching switch for controlling the on-off state of the heating energy storage module and the on-board battery, and the battery heating system can adjust the on-off state of the first switching switch and the second switching switch to make the on-board battery in pulse heating mode or overcharge mode.

[0103] Please refer to Figure 1 , the charging pile is a 360KW liquid cooling overcharge pile which can provide power input for the on-board battery to make it in overcharge mode, and it has charging interfaces HPC-DCU1 and HPC-DCU2 which are connected to vehicle 1 and vehicle 2 respectively, i.e. connected to two on-board batteries through charging terminals 1 and 2 respectively to charge them.

[0104] The heating energy storage module is composed of a bidirectional DC / DC and an energy storage battery, and is used for pulse heating of an on-board battery in the vehicle 1 and the vehicle 2. The first switching switch is the switch S1 and the switch S2, and the second switching switch is the switch S3 and the switch S4. By adjusting the on-off state of the first switching switch and the second switching switch, the on-board battery can be switched between the pulse heating mode and the supercharging mode.

[0105] It should be noted that, Figure 1 The connection diagram is only for an embodiment of the present application. In other embodiments of the present application, the charging interface is not limited to two, but can be provided with multiple charging interfaces, each of which is connected to an on-board battery. Meanwhile, the heating energy storage module is not limited to one, but only needs to ensure that each on-board battery is connected to one heating energy storage module and can perform the pulse heating mode. Improvements based on the above working principle should be within the protection scope of the present application.

[0106] Please refer to Figure 1 and Figure 4 When the first switching switch is closed and the second switching switch is opened, the charging pile is connected with the on-board battery, and the heating energy storage module is disconnected with the on-board battery. At this time, the on-board battery is in the supercharging mode. In this mode, the charging pile charges the on-board battery, and the charging speed is relatively fast, which can meet the demand for charging rate.

[0107] When the first switching switch is opened and the second switching switch is closed, the charging pile is disconnected with the on-board battery, and the heating energy storage module is connected with the on-board battery. At this time, the on-board battery is in the pulse heating mode. In this mode, the heating energy storage module pulse heats the on-board battery, so as to preheat the on-board battery and avoid the lithium precipitation phenomenon of the on-board battery.

[0108] Please refer to Figure 1 For the on-board battery in the vehicle 1, when the switch S1 is closed and the switch S3 is opened, the on-board battery is in the supercharging mode. When the switch S1 is opened and the switch S3 is closed, the on-board battery is in the pulse heating mode.

[0109] For the on-board battery in the vehicle 2, when the switch S2 is closed and the switch S4 is opened, the on-board battery is in the supercharging mode. When the switch S2 is opened and the switch S4 is closed, the on-board battery is in the pulse heating mode.

[0110] Please refer to Figure 2 It is a schematic diagram of the multi-vehicle charging scene. The battery heating system proposed in the present application is adopted, and the above multi-vehicle battery heating method is combined, so that the resources of the fast charging station can be fully utilized, the charging efficiency of the fast charging station is improved, and the charging congestion problem of the multi-vehicle simultaneous charging is solved.

[0111] Further, the DC / DC circuit in the application includes a transformer, a first full-bridge circuit connected to the primary side of the transformer, and a second full-bridge circuit connected to the secondary side of the transformer, and the heating energy storage module can adjust the conduction state of the switching tubes in the first full-bridge circuit and the second full-bridge circuit to pulse heat the vehicle-mounted battery.

[0112] Please refer to Figure 6 , the transformer is T, the primary side of the transformer is the energy storage battery side, the first full-bridge circuit is composed of switching tube Q1, switching tube Q2, switching tube Q3, and switching tube Q4, wherein switching tube Q1 and switching tube Q3 constitute the first bridge arm, and switching tube Q2 and switching tube Q4 constitute the second bridge arm, the secondary side is the vehicle-mounted battery side, the second full-bridge circuit is composed of switching tube Q5, switching tube Q6, switching tube Q7, and switching tube Q8, wherein switching tube Q5 and switching tube Q7 constitute the third bridge arm, and switching tube Q6 and switching tube Q8 constitute the fourth bridge arm, by adjusting the conduction state of switching tube Q1 to switching tube Q8, the current can flow between the energy storage battery and the vehicle-mounted battery, due to the existence of the internal resistance of the vehicle-mounted battery, the vehicle-mounted battery itself can generate heat during the current flow, thereby increasing the temperature itself and avoiding the occurrence of lithium precipitation.

[0113] The battery heating system and the multi-vehicle battery heating method provided by the application solve the problem of low charging rate of the vehicle-mounted battery in a low-temperature environment, and have at least the following beneficial effects compared with the prior art:

[0114] 1. The application solves the charging congestion problem when multiple vehicles are charging at the same time by detecting the temperature information and power information of the vehicle-mounted battery, and optimizes the charging strategy of the charging station.

[0115] 2. The application adds a heating energy storage module to the original charging station for energy exchange to the vehicle-mounted battery, so that the vehicle-mounted battery itself can generate heat, avoiding the problem of lithium precipitation of the battery and improving the charging efficiency.

[0116] 3. The application has multiple charging interfaces, which can simultaneously pulse heat or super-charge the vehicle-mounted batteries of multiple vehicles, improving resource utilization.

[0117] The above only describes the preferred embodiments of the application and is not intended to limit the application, and any modifications, equivalent replacements, and improvements made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A method for heating batteries in multiple vehicles, characterized in that, include: When there are at least 2 vehicles in the charging state, detect the temperature and charge parameters of the on-board battery in the charging vehicles. The vehicle battery is charged according to the temperature parameters and the power parameters. Once all the vehicle batteries have finished charging, stop charging. When the temperature parameter of the vehicle battery is detected to be between a first preset temperature and a second preset temperature, the multi-vehicle battery heating method further includes: Check if any other vehicle batteries are in pulse heating mode; If not, the currently detected vehicle battery will be set to pulse heating mode, pulse heated, and switched to supercharging mode when its temperature is higher than the second preset temperature. Conversely, the system will perform slow charging on the currently detected vehicle battery through the charging station, and after other vehicle batteries have completed pulse heating, the currently detected vehicle battery will be set to pulse heating mode.

2. The multi-vehicle battery heating method according to claim 1, characterized in that, The on-board battery is charged according to the temperature parameter and the power parameter, including: Select an on-board battery with a temperature parameter lower than the first preset temperature; Set the charging sequence of the vehicle battery according to the power parameters; The vehicle battery is charged according to the charging sequence.

3. The multi-vehicle battery heating method according to claim 2, characterized in that, The power parameter refers to the remaining power of the vehicle battery. The charging sequence of the vehicle battery is set according to the power parameter, including: Obtain the remaining power of all the aforementioned vehicle batteries; The charging sequence is set according to the remaining power of the vehicle battery from low to high.

4. The multi-vehicle battery heating method according to claim 2, characterized in that, Performing a charging operation on the vehicle battery includes: When the temperature of the vehicle battery is lower than the first preset temperature, the charging mode of the vehicle battery is set to pulse heating mode; When the temperature of the vehicle battery rises to the second preset temperature, the charging mode of the vehicle battery is set to supercharging mode. Charging will stop when the remaining charge of the vehicle battery reaches the preset level.

5. The multi-vehicle battery heating method according to claim 1, characterized in that, When one vehicle is in a charging state, the multi-vehicle battery heating method further includes: Detect the temperature parameters of the on-board battery in a vehicle that is charging; Determine whether the temperature parameter of the vehicle battery is greater than the second preset temperature. If so, set the charging mode of the vehicle battery to supercharging mode. Conversely, the charging mode of the vehicle battery is set to pulse heating mode, and when the temperature of the vehicle battery rises to the second preset temperature, it switches to supercharging mode.

6. A battery heating system using the multi-vehicle battery heating method as described in any one of claims 1 to 5, characterized in that, include: A charging pile has multiple charging interfaces, and each charging interface is connected to a vehicle battery for supercharging the vehicle battery. A heating and energy storage module is connected between the charging interface and the vehicle battery, and can pulse heat the vehicle battery.

7. The battery heating system according to claim 6, characterized in that, It also includes a first switching switch for controlling the on / off state of the charging interface and the vehicle battery, and a second switching switch for controlling the on / off state of the heating energy storage module and the vehicle battery. The battery heating system can adjust the on / off state of the first switching switch and the second switching switch to put the vehicle battery in pulse heating mode or supercharging mode.

8. The battery heating system according to claim 7, characterized in that, When the first switching switch is closed and the second switching switch is open, the battery heating system is in supercharging mode; When the first switching switch is open and the second switching switch is closed, the battery heating system is in pulse heating mode.

9. The battery heating system according to claim 6, characterized in that, The heating energy storage module includes: an energy storage battery and a DC / DC circuit connected to the energy storage battery; The DC / DC circuit includes a transformer, a first full-bridge circuit connected to the primary side of the transformer, and a second full-bridge circuit connected to the secondary side of the transformer. The heating energy storage module can pulse heat the vehicle battery by adjusting the conduction state of the switching transistors in the first and second full-bridge circuits.

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