Vehicle-to-vehicle charging method and device, controller and readable storage medium

Abstract

The invention relates to a vehicle-to-vehicle charging method and device, a controller and a computer readable storage medium. The method comprises the steps that under the condition that a BMS controller of a target vehicle to be charged is started, BMS information of the target vehicle is acquired; under the condition that the BMS information meets a preset condition, generating a first charging message, and sending the first charging message to a vehicle control unit of a power supply vehicle for performing power supply processing on the target vehicle; the first charging instruction is used for instructing the power supply vehicle to carry out power supply processing so as to heat a battery pack of the target vehicle; under the condition that the BMS information does not meet the preset condition, a second charging message is generated, and the second charging message is sent to a whole vehicle controller of the power supply vehicle; the second charging message is used for indicating the power supply vehicle to carry out power supply processing so as to charge the battery pack. The method can be applied to different vehicle-to-vehicle charging application scenes, and the intelligent degree of the vehicle-to-vehicle charging mode can be improved through the mode.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a vehicle-to-vehicle charging method, device, controller, computer-readable storage medium, and computer program product. Background Art

[0002] With the development of automobile technology, a new energy vehicle that uses electricity to drive has emerged. Compared with traditional fuel vehicles, new energy vehicles can reduce air pollution and greenhouse gas emissions. In addition, while electricity consumption is much lower than fuel costs, it also has the characteristics of high energy conversion efficiency. Therefore, new energy vehicles have the advantages of environmental protection, economy, and high energy efficiency compared to fuel vehicles.

[0003] During the use of new energy vehicles, if the ambient temperature is too low, the performance of the battery pack of the new energy vehicle may be affected. For example, in a low temperature environment, the available discharge power of the battery is reduced. Even after the vehicle is connected to high voltage, the car battery cannot be recharged, causing the battery to be depleted, resulting in the DC-DC converter DCDC and the corresponding high-voltage accessories not being able to work, and the vehicle cannot be used any further. The battery pack may also be low in power and unable to be connected to high voltage, resulting in the vehicle being unable to be moved to the charging pile for charging. Therefore, it is usually necessary to charge the vehicle through car-to-car charging.

[0004] It can be seen that there are many application scenarios in which car-to-car charging is required in a low temperature environment, and the car-to-car charging method provided in the relevant technology is often not applicable in different application scenarios. Therefore, the car-to-car charging method provided by the relevant technology is not smart enough. Summary of the invention

[0005] Based on this, it is necessary to provide a vehicle-to-vehicle charging method, device, controller, computer-readable storage medium and computer program product that can improve the intelligence of the vehicle-to-vehicle charging method in response to the above technical problems.

[0006] In a first aspect, the present application provides a vehicle-to-vehicle charging method, which is applied to a BMS controller of a target vehicle to be charged, comprising:

[0007] When the BMS controller is started, obtaining BMS information of the target vehicle;

[0008] When the BMS information meets the preset conditions, a first charging message is generated, and the first charging message is sent to a vehicle controller of a power supply vehicle that performs power supply processing on the target vehicle; the first charging message is used to instruct the power supply vehicle to perform power supply processing to heat the battery pack of the target vehicle;

[0009] When the BMS information does not meet the preset condition, a second charging message is generated and sent to the vehicle controller of the power supply vehicle; the second charging message is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack.

[0010] In one of the embodiments, the BMS information includes at least one of the battery capacity of the target vehicle, the maximum discharge power of the BMS controller, the maximum battery cell temperature of the BMS controller, and a heating signal triggered by the BMS controller; after obtaining the BMS information of the target vehicle, it also includes: when the BMS information includes the heating signal, determining that the BMS information meets a preset condition; when the BMS information does not include the heating signal, identifying whether the BMS information meets the preset condition based on the battery capacity, the maximum discharge power and the maximum battery cell temperature.

[0011] In one of the embodiments, the identifying whether the BMS information satisfies the preset condition based on the battery capacity, the maximum discharge power and the maximum battery cell temperature includes: when the battery capacity is greater than a preset battery capacity threshold, the maximum discharge power is zero, and the maximum battery cell temperature is less than a preset temperature threshold, determining that the BMS information satisfies the preset condition; when one of the following conditions is met: the battery capacity is not greater than a preset battery capacity threshold, the maximum discharge power is not zero, or the maximum battery cell temperature is not less than a preset temperature threshold, determining that the BMS information does not satisfy the preset condition.

[0012] In one of the embodiments, generating the first charging message includes: obtaining a target temperature to be heated, and a heating power correspondence relationship pre-constructed for the target temperature; the heating power correspondence relationship stores the power required to output when heating different starting temperatures to the target temperature; according to the current temperature of the battery pack and the heating power correspondence relationship, obtaining the target power required to output when heating the current temperature to the target temperature, and generating the first charging message based on the target power; the first charging message is used to instruct the power supply vehicle to perform power supply processing according to the target power so as to heat the battery pack to the target temperature.

[0013] In one of the embodiments, the generating of the second charging message includes: obtaining a charging strategy correspondence relationship pre-constructed for the target vehicle; the charging strategy correspondence relationship includes multiple charging cut-off voltages, and the charging current ratio and the static time corresponding to each of the charging cut-off voltages; generating the second charging message according to the charging strategy correspondence relationship; the second charging message is used to instruct the power supply vehicle to obtain the current charging cut-off voltage from the multiple charging cut-off voltages, and the charging current ratio corresponding to the current charging cut-off voltage; using the power supply of the target vehicle to charge the battery pack according to the charging current ratio, and stopping charging when the voltage of the battery pack reaches the current charging cut-off voltage; when the duration of stopping charging reaches the static time corresponding to the current charging cut-off voltage, using the next charging cut-off voltage of the current charging cut-off voltage as the new current charging cut-off voltage, until the current charging cut-off voltage is the last one of the multiple charging cut-off voltages.

[0014] In a second aspect, the present application also provides a vehicle-to-vehicle charging method, which is applied to a vehicle controller of a power supply vehicle, comprising:

[0015] When the BMS controller of the target vehicle to be charged is started, receiving a charging message returned by the BMS controller; the charging message includes a first charging message and a second charging message, the first charging message is a charging message generated by the BMS controller when the BMS information of the target vehicle meets a preset condition, and the second charging message is a charging message generated by the BMS controller when the BMS information does not meet the preset condition;

[0016] In the case where the charging message is the first charging message, a first power supply instruction is generated; the first power supply instruction is used to instruct the power supply vehicle to perform a power supply process to heat the battery pack of the target vehicle;

[0017] In the case where the charging message is the second charging message, a second power supply instruction is generated; the second power supply instruction is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack.

[0018] In one of the embodiments, when the BMS controller of the target vehicle to be charged is started, before receiving the charging message returned by the BMS controller, it also includes: when the power supply vehicle is connected to the target vehicle, if a vehicle message carrying the battery voltage of the target vehicle sent by the BMS controller is received, and the battery voltage reaches a preset battery voltage threshold, it is determined that the BMS controller is started; if the vehicle message is not received, or the battery voltage of the target vehicle carried in the received vehicle message does not reach the preset battery voltage threshold, a battery power supply instruction is generated; the battery power supply instruction is used to instruct the power supply vehicle to power the battery of the target vehicle so that the battery voltage reaches the preset battery voltage threshold.

[0019] In one of the embodiments, the first charging message carries a target power; the target power is determined by the BMS controller of the target vehicle based on the target temperature to be heated; when the charging message is the first charging message, generating a first power supply instruction includes: when the charging message is the first charging message, obtaining the target power from the first charging message; generating the first power supply instruction according to the target power; the first power supply instruction is used to instruct the power supply vehicle to perform power supply processing according to the target power to heat the battery pack to the target temperature.

[0020] In one embodiment, the second charging message carries a charging strategy correspondence relationship pre-constructed for the target vehicle; the charging strategy correspondence relationship includes multiple charging cut-off voltages, and the charging current multiple and the static time corresponding to each of the charging cut-off voltages; when the charging message is the second charging message, generating a second power supply instruction includes: when the charging message is the second charging message, obtaining multiple charging cut-off voltages in the charging strategy correspondence relationship, and the charging current multiple and the static time corresponding to each of the charging cut-off voltages from the second charging message; according to the multiple charging cut-off voltages, and the charging current multiple and the static time corresponding to each of the charging cut-off voltages The second power supply instruction is generated based on the power supply rate and the static time; the second power supply instruction is used to instruct the power supply vehicle to obtain the current charging cut-off voltage from multiple charging cut-off voltages, and the charging current rate corresponding to the current charging cut-off voltage; use the power supply of the target vehicle to charge the battery pack according to the charging current rate, and stop charging when the voltage of the battery pack reaches the current charging cut-off voltage; when the charging stop time reaches the static time corresponding to the current charging cut-off voltage, use the next charging cut-off voltage of the current charging cut-off voltage as the new current charging cut-off voltage, until the current charging cut-off voltage is the last one of the multiple charging cut-off voltages.

[0021] In a third aspect, the present application further provides a vehicle-to-vehicle charging device, which is applied to a BMS controller of a target vehicle to be charged, comprising:

[0022] A BMS information acquisition module, used to acquire the BMS information of the target vehicle when the BMS controller is started;

[0023] A first message generating module, configured to generate a first charging message when the BMS information meets a preset condition, and send the first charging message to a vehicle controller of a power supply vehicle that performs power supply processing on the target vehicle; the first charging message is used to instruct the power supply vehicle to perform power supply processing to heat the battery pack of the target vehicle;

[0024] The second message generation module is used to generate a second charging message when the BMS information does not meet the preset conditions, and send the second charging message to the vehicle controller of the power supply vehicle; the second charging message is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack.

[0025] In a fourth aspect, the present application also provides a vehicle-to-vehicle charging device, which is applied to a vehicle controller of a power supply vehicle, comprising:

[0026] A charging message receiving module, used for receiving a charging message returned by the BMS controller when the BMS controller of the target vehicle to be charged is started; the charging message includes a first charging message and a second charging message, the first charging message is a charging message generated by the BMS controller when the BMS information of the target vehicle meets a preset condition, and the second charging message is a charging message generated by the BMS controller when the BMS information does not meet the preset condition;

[0027] a first instruction generating module, configured to generate a first power supply instruction when the charging message is the first charging message; the first power supply instruction is used to instruct the power supply vehicle to perform a power supply process so as to heat the battery pack of the target vehicle;

[0028] The second instruction generating module is used to generate a second power supply instruction when the charging message is the second charging message; the second power supply instruction is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack.

[0029] In a fifth aspect, the present application further provides a controller comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method described in any one of the embodiments of the first aspect or the second aspect when executing the computer program.

[0030] In a sixth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the method described in any one of the embodiments of the first aspect or the second aspect are implemented.

[0031] In a fifth aspect, the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, performs the steps of the method described in any embodiment of the first aspect or the second aspect.

[0032] The above-mentioned vehicle-to-vehicle charging method, device, controller, computer-readable storage medium and computer program product obtain the BMS information of the target vehicle to be charged when the BMS controller of the target vehicle to be charged is started; when the BMS information meets the preset conditions, a first charging message is generated, and the first charging message is sent to the vehicle controller of the power supply vehicle that performs power supply processing on the target vehicle; the first charging message is used to instruct the power supply vehicle to perform power supply processing to heat the battery pack of the target vehicle; when the BMS information does not meet the preset conditions, a second charging message is generated, and the second charging message is sent to the vehicle controller of the power supply vehicle; the second charging message is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack. The present application can obtain the BMS information of the target vehicle if the BMS controller of the target vehicle is started when the power supply vehicle is charging, and determine whether the BMS information meets the preset conditions. If so, a first charging message is generated and sent to the vehicle controller of the power supply vehicle to instruct the power supply vehicle to supply power to the target vehicle to heat the battery pack of the target vehicle. If not, a second charging message is generated and sent to the vehicle controller of the power supply vehicle to instruct the power supply vehicle to supply power to the target vehicle to charge the battery pack of the target vehicle. It can be seen that the BMS controller of the target vehicle can identify the vehicle-to-vehicle charging mode based on the actual BMS information, and can therefore be applicable to different vehicle-to-vehicle charging application scenarios. In this way, the intelligence of the vehicle-to-vehicle charging method can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A diagram of an application environment of a vehicle-to-vehicle charging method in one embodiment;

[0035] Figure 2 It is a schematic diagram of a flow chart of a vehicle-to-vehicle charging method in one embodiment;

[0036] Figure 3 A schematic diagram of a flow chart for identifying whether BMS information meets a preset condition in one embodiment;

[0037] Figure 4 It is a flowchart of a vehicle-to-vehicle charging method in another embodiment;

[0038] Figure 5A schematic diagram of V2V charging a small battery of a rescued vehicle in one embodiment;

[0039] Figure 6 A schematic diagram of V2V providing heating power to a rescued vehicle in one embodiment;

[0040] Figure 7 A schematic diagram of V2V charging a battery of a rescued vehicle in one embodiment;

[0041] Figure 8 A schematic diagram of a V2V intelligent charging comprehensive interaction process in an embodiment;

[0042] Fig. 9 is a structural block diagram of a vehicle-to-vehicle charging device in one embodiment;

[0043] Fig.10 is a structural block diagram of a vehicle-to-vehicle charging device in another embodiment;

[0044] Fig.11 FIG. 4 is a diagram showing the internal structure of a controller in one embodiment. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0046] The vehicle-to-vehicle charging method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. Among them, the target vehicle refers to the vehicle that needs to be charged, and the power supply vehicle is the vehicle that supplies power to the target vehicle. The target vehicle is provided with a battery management system controller, that is, a BMS controller 101, and the power supply vehicle is provided with a vehicle controller 102. When performing vehicle-to-vehicle charging, the target vehicle is electrically connected to the power supply vehicle, and the BMS controller 101 is connected to the vehicle controller 102 for communication. Specifically, when the power supply vehicle is connected to the target vehicle for vehicle-to-vehicle charging, if the BMS controller 101 of the target vehicle is in the started state, the BMS information can be collected, and then the BMS information is used to determine whether the preset conditions are met. If the preset conditions are met, a first charging message is generated and sent to the vehicle controller 102 to instruct the vehicle controller 102 to control the power supply vehicle to supply power to the target vehicle to heat the battery pack of the target vehicle. If the preset conditions are not met, a second charging message is generated and sent to the vehicle controller 102 to instruct the vehicle controller 102 to control the power supply vehicle to supply power to the target vehicle to charge the battery pack.

[0047] In one embodiment, Figure 2As shown, a vehicle-to-vehicle charging method is provided, and the method is applied to Figure 1 Taking the BMS controller 101 in the example as an example, the method includes the following steps:

[0048] Step S201 : when the BMS controller 101 is started, the BMS information of the target vehicle is obtained.

[0049] Among them, the startup of the BMS controller 101 means that the BMS controller 101 is in a normal operating state, and the BMS information refers to the information related to the target vehicle collected by the BMS controller 101 in the startup state, such as battery capacity, etc. In this embodiment, when the power supply vehicle is connected to the target vehicle to power the target vehicle, if the BMS controller 101 is in the startup state, the BMS controller 101 can obtain the BMS information of the target vehicle.

[0050] Step S202, when the BMS information meets the preset conditions, generates a first charging message and sends the first charging message to the vehicle controller 102 of the power supply vehicle that performs power supply processing on the target vehicle; the first charging message is used to instruct the power supply vehicle to perform power supply processing to heat the battery pack of the target vehicle.

[0051] The preset condition is a pre-set condition for identifying the charging mode, and the first charging message is generated by the BMS controller 101, corresponding to the charging message of charging mode 1, which is used to instruct the power supply vehicle to supply power to heat the battery pack of the target vehicle. Due to the need for car-to-car charging, it may be that the discharge power of the battery is "frozen" when the temperature is cold. In this case, the available discharge power tends to 0 when the temperature is low, or the available discharge power is extremely small, resulting in the inability of DCDC and the corresponding high-voltage accessories to work. Even after the vehicle is on high voltage, the battery cannot be intelligently replenished, resulting in battery depletion, black screen of the instrument, and the vehicle is under high voltage, which makes it impossible to continue to use the vehicle. In this case, it is only necessary to heat the battery pack of the target vehicle to complete the charging of the target vehicle. Therefore, if the BMS controller 101 recognizes that the target vehicle needs to be charged by car-to-car due to the above reasons, it can generate a first charging message and send it to the vehicle controller 102 of the power supply vehicle to notify the power supply vehicle to perform power supply processing to achieve heating of the battery pack of the target vehicle.

[0052] Specifically, after obtaining the BMS information, the BMS controller 101 can determine whether the BMS information meets the preset conditions. If it does, it means that the current target vehicle is actually in a state where the battery discharge power is "frozen". Then the BMS controller 101 can generate a first charging message and send it to the vehicle controller 102 of the power supply vehicle. The vehicle controller 102 can control the power supply mode of the power supply vehicle to control the power supply vehicle to supply power to the heating film of the battery pack of the target vehicle to heat the battery pack of the target vehicle.

[0053] Step S203, when the BMS information does not meet the preset conditions, generate a second charging message and send the second charging message to the vehicle controller 102 of the power supply vehicle; the second charging message is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack.

[0054] The second charging message is generated by the BMS controller 101, which corresponds to the charging message of charging mode 2. This message is used to instruct the power supply vehicle to supply power to charge the battery pack of the target vehicle. Due to the need for car-to-car charging, it may also be that the battery pack has a low power level and cannot be charged with high voltage, resulting in the vehicle being unable to move to the charging pile for charging, so car-to-car charging is required. In this case, it is necessary to directly charge the battery pack of the target vehicle to complete the charging of the target vehicle. Therefore, if the BMS controller 101 recognizes that the target vehicle needs to be charged car-to-car for this reason, it can generate a second charging message and send it to the vehicle controller 102 of the power supply vehicle to notify the power supply vehicle to perform power supply processing, so as to realize the charging of the battery pack of the target vehicle.

[0055] Specifically, if the BMS information collected by the BMS controller 101 does not meet the preset conditions, that is, it means that the battery pack is too low and vehicle-to-vehicle charging is required, in this case, the BMS controller 101 can generate a second charging message and send it to the vehicle controller 102 of the power supply vehicle. The vehicle controller 102 can control the power supply mode of the power supply vehicle to control the power supply vehicle to charge the battery pack of the target vehicle.

[0056] In the above-mentioned vehicle-to-vehicle charging method, when the BMS controller 101 of the target vehicle to be charged is started, the BMS information of the target vehicle is obtained; when the BMS information meets the preset conditions, a first charging message is generated, and the first charging message is sent to the vehicle controller 102 of the power supply vehicle that performs power supply processing on the target vehicle; the first charging message is used to instruct the power supply vehicle to perform power supply processing to heat the battery pack of the target vehicle; when the BMS information does not meet the preset conditions, a second charging message is generated, and the second charging message is sent to the vehicle controller 102 of the power supply vehicle; the second charging message is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack. The present application can obtain the BMS information of the target vehicle if the BMS controller 101 of the target vehicle is started when the power supply vehicle is charging, and determine whether the BMS information meets the preset conditions. If so, a first charging message is generated and sent to the vehicle controller 102 of the power supply vehicle to instruct the power supply vehicle to supply power to the target vehicle to heat the battery pack of the target vehicle. If not, a second charging message is generated and sent to the vehicle controller 102 of the power supply vehicle to instruct the power supply vehicle to supply power to the target vehicle to charge the battery pack of the target vehicle. It can be seen that the BMS controller 101 of the target vehicle can identify the vehicle-to-vehicle charging mode based on the actual BMS information, and can therefore be applicable to different vehicle-to-vehicle charging application scenarios. In this way, the intelligence of the vehicle-to-vehicle charging method can be improved.

[0057] In one embodiment, the BMS information includes at least one of the battery capacity of the target vehicle, the maximum discharge power of the BMS controller 101, the maximum cell temperature of the BMS controller 101, and the heating signal triggered by the BMS controller 101; Figure 3 As shown, step S201 may further include:

[0058] Step S301: when the BMS information includes a heating signal, determining that the BMS information meets a preset condition.

[0059] In this embodiment, the real-time information collected by the BMS controller 101, that is, the BMS information, may include the following parts: the battery capacity of the target vehicle, that is, the SOC of the target vehicle, the maximum discharge power of the BMS controller 101, the maximum battery cell temperature of the BMS controller 101, and the heating signal actively triggered by the BMS controller 101 for heating the battery pack.

[0060] Specifically, if the BMS information of the target vehicle collected by the BMS controller 101 includes a heating signal actively triggered by the BMS controller 101, it means that the battery pack needs to be heated at this time, so the BMS controller 101 will determine that the current BMS information meets the preset conditions.

[0061] Step S302: If the BMS information does not contain a heating signal, it is determined whether the BMS information meets a preset condition according to the battery capacity, the maximum discharge power and the maximum battery cell temperature.

[0062] If the BMS information does not include a heating signal, that is, the BMS controller 101 does not actively trigger a heating signal for heating the battery pack, in this case, it can be determined whether the BMS information meets the preset conditions based on the SOC of the target vehicle, the maximum discharge power of the BMS controller 101, and the maximum battery cell temperature of the BMS controller 101.

[0063] In this embodiment, the BMS information includes the battery capacity of the target vehicle, the maximum discharge power of the BMS controller, the maximum battery cell temperature of the BMS controller, and at least one of the heating signals triggered by the BMS controller. If the BMS information includes a heating signal, it is directly determined that the BMS information meets the preset conditions. If the heating signal is not included, it is further identified whether the BMS information meets the preset conditions based on the battery capacity, the maximum discharge power and the maximum battery cell temperature. In this way, the accuracy of charging message generation can be further improved.

[0064] Further, step S302 may further include: when the battery capacity is greater than a preset battery capacity threshold, the maximum discharge power is zero, and the maximum battery cell temperature is less than a preset temperature threshold, determining that the BMS information meets the preset conditions; when one of the following conditions is met: the battery capacity is not greater than the preset battery capacity threshold, the maximum discharge power is not zero, or the maximum battery cell temperature is not less than the preset temperature threshold, determining that the BMS information does not meet the preset conditions.

[0065] The preset battery capacity threshold is a preset battery capacity threshold, which can indicate whether the battery capacity is high. For example, the threshold can be set to 50%, and the preset temperature threshold refers to a preset battery cell temperature threshold, which can indicate whether the battery cell temperature of the BMS controller 101 is too low. For example, the threshold can be set to 0°C.

[0066] Specifically, if the BMS information does not include a heating signal, the BMS controller 101 can further judge the following conditions, which may include judging whether the battery capacity of the target vehicle is greater than a preset battery capacity threshold, that is, judging whether the battery capacity of the target vehicle is greater than 50%, and judging whether the maximum discharge power of the BMS controller 101 is 0. It can also judge whether the maximum battery cell temperature of the BMS controller 101 is less than a preset temperature threshold, that is, judging whether the maximum battery cell temperature of the BMS controller 101 is less than 0°C.

[0067] If the battery capacity of the target vehicle is greater than 50%, the maximum discharge power of the BMS controller 101 is 0, and the maximum battery cell temperature of the BMS controller 101 is less than 0°C, it means that the discharge power of the battery is "frozen" when the temperature is cold. In this case, it is determined that the above BMS information meets the preset conditions. At this time, the BMS controller 101 can generate a first charging message to instruct the power supply vehicle to heat the battery pack of the target vehicle by supplying power.

[0068] If one of the above conditions is not met, for example, the battery capacity of the target vehicle is not greater than 50%, or the maximum discharge power of the MS controller 101 is not 0, or the maximum battery cell temperature of the BMS controller 101 is not less than 0°C, it means that the battery discharge power is not "frozen" at this time. In this case, it is determined that the above BMS information does not meet the preset conditions. At this time, the BMS controller 101 can generate a second charging message to instruct the power supply vehicle to directly charge the battery pack of the target vehicle by supplying power.

[0069] In this embodiment, it is also possible to determine whether the BMS information meets the preset conditions by judging whether the battery capacity is greater than the preset battery capacity threshold, whether the maximum discharge power is zero, and whether the maximum battery cell temperature is less than the preset temperature threshold, thereby determining whether the generated charging message is the first charging message or the second charging message. In this way, the accuracy of generating the charging message can be further improved.

[0070] In one embodiment, step S202 may further include: obtaining a target temperature to be heated, and a heating power correspondence relationship pre-constructed for the target temperature; the heating power correspondence relationship stores the power required to output when heating different starting temperatures to the target temperature; according to the current temperature of the battery pack and the heating power correspondence relationship, obtaining the target power required to output when heating the current temperature to the target temperature, and generating a first charging message based on the target power; the first charging message is used to instruct the power supply vehicle to perform power supply processing according to the target power so as to heat the battery pack to the target temperature.

[0071] The target temperature refers to the temperature at which the battery pack needs to be heated. The target temperature can be preset and can be set according to the actual situation of the target vehicle. For example, it can be 20°C, 21°C, 22°C or 25°C, etc. The heating power correspondence refers to the power required to heat to the target temperature. The correspondence can be presented in the form of a correspondence table, which stores the power output required to heat to the target temperature from different heating starting temperatures. For example, the correspondence table can be shown in Table 1:

[0072] Table 1 Correspondence table of heating power

[0073]

[0074] Among them, N1 to N6 represent the power required to heat to the target temperature. For example, if the target temperature is 25°C, then N1 represents the power required to heat from -10°C to the target temperature, N2 represents the power required to heat from -5°C to the target temperature, and so on.

[0075] Therefore, the BMS controller 101 can obtain the target power required to heat the current temperature to the target temperature based on the corresponding relationship between the current temperature of the battery pack and the heating power. For example, if the current temperature is -5°C, the target power is N2. Similarly, if the current temperature is -10°C, the target power is N1. After obtaining the target power, a first charging message carrying the target power can be generated. The first charging message can instruct the power supply vehicle to perform power supply processing according to the target power, thereby heating the battery pack to the target temperature.

[0076] In this embodiment, the BMS controller 101 can also obtain the target power required to heat the current temperature to the target temperature based on the target temperature to be heated, the heating power correspondence pre-constructed for the target temperature, and the current temperature of the battery pack, and then use the target power to generate a first charging message to instruct the power supply vehicle to perform power supply processing according to the target power, so as to heat the battery pack to the target temperature. In this way, the accuracy of the power supply processing of the power supply vehicle can be improved.

[0077] In addition, step S203 may further include: obtaining a charging strategy correspondence relationship pre-constructed for the target vehicle; the charging strategy correspondence relationship includes multiple charging cut-off voltages, and the charging current ratio and the static time corresponding to each charging cut-off voltage; generating a second charging message according to the charging strategy correspondence relationship; the second charging message is used to instruct the power supply vehicle to obtain the current charging cut-off voltage from the multiple charging cut-off voltages, and the charging current ratio corresponding to the current charging cut-off voltage; using the power supply of the target vehicle to charge the battery pack according to the charging current ratio, and stopping charging when the voltage of the battery pack reaches the current charging cut-off voltage; when the duration of stopping charging reaches the static time corresponding to the current charging cut-off voltage, using the next charging cut-off voltage of the current charging cut-off voltage as the new current charging cut-off voltage, until the current charging cut-off voltage is the last one of the multiple charging cut-off voltages.

[0078] The charging strategy correspondence is used to characterize the charging strategy for charging the target vehicle. In this embodiment, the charging strategy used for the target vehicle may be a variable current intermittent charging strategy, which means charging the battery pack of the target vehicle to a cutoff voltage according to a certain current, letting it stand for a period of time, and then repeating the above process to continue charging until the battery pack of the target vehicle is fully charged. The charging cutoff voltage is the above cutoff voltage, and the charging current rate refers to the rate of the charging current used to charge to the cutoff voltage, and the standing time characterizes the length of time after charging to the cutoff voltage. For example, the charging strategy correspondence can be characterized by a charging strategy correspondence table, which can be shown in Table 2:

[0079] Table 2 Charging strategy correspondence table

[0080]

[0081] According to the above table, the charging strategy represented by the table is to first charge with a charging current of 1C, let it stand for 10s after the voltage of the battery pack reaches 3.6V, and then charge with a charging current of 0.5C, let it stand for 20s after the voltage of the battery pack reaches 3.62V, and so on, until the voltage reaches the full charge voltage of 3.65V.

[0082] Specifically, a charging strategy correspondence relationship of the target vehicle can be constructed in advance for the target vehicle, and the correspondence relationship records multiple charging cut-off voltages, and the charging current ratio and the static time length corresponding to each charging cut-off voltage, and then a second charging message carrying the charging strategy correspondence relationship information can be generated and sent to the vehicle controller 102. Since the second charging message carries the above-mentioned correspondence relationship, when the power supply vehicle is supplying power, it can also supply power according to the above-mentioned correspondence relationship. For example, the current charging cut-off voltage can be first identified from multiple charging cut-off voltages, that is, the cut-off voltage for the first charge and the charging current ratio corresponding to the current charging cut-off voltage can be identified, so as to charge according to the above-mentioned charging current ratio until the voltage of the battery pack reaches the current charging cut-off voltage and then stops charging, until the duration of stopping charging reaches the static time length corresponding to the current charging cut-off voltage, and the next charging cut-off voltage of the current charging cut-off voltage is used as the new current charging cut-off voltage, and the above process is repeated until the current charging cut-off voltage is the last one of the multiple charging cut-off voltages.

[0083] In addition, the charging current rate corresponding to each charging cut-off voltage can be calibrated in the following manner: first, multiple candidate charging current rates are set for any one of the multiple charging cut-off voltages to be calibrated, and then charging can be performed according to each candidate charging current rate respectively, and the charging time for the battery pack to reach the charging cut-off voltage to be calibrated when charging according to each candidate charging current rate is counted, so that the charging capacity corresponding to each candidate charging current rate is obtained by using each candidate charging current rate and the corresponding charging time, and the candidate charging current rate with the largest charging capacity is used as the charging current rate corresponding to the charging cut-off voltage to be calibrated.

[0084] For example, if the charging cut-off voltage to be calibrated is 3.62V, the multiple candidate charging current rates may be 0.6C, 0.5C, 0.4C and 0.3C respectively. Then, the battery pack may be charged according to each candidate charging current rate respectively, and the charging time for charging the battery pack to 3.62V for each candidate charging current rate may be counted. The charging time corresponding to 0.6C may be charging time 1, the charging time corresponding to 0.5C may be charging time 2, the charging time corresponding to 0.4C may be charging time 3, and the charging time corresponding to 0.3C may be charging time 4. Then, the charging capacity corresponding to 0.6C may be calculated using charging time 1, the charging capacity corresponding to 0.5C may be calculated using charging time 2, the charging capacity corresponding to 0.4C may be calculated using charging time 3, and the charging capacity corresponding to 0.3C may be calculated using charging time 4 to determine the maximum charging capacity. If the charging capacity corresponding to 0.5C is the largest, then 0.5C is used as the charging current rate corresponding to the charging cut-off voltage to be calibrated, 3.62V. In this embodiment, a charging strategy correspondence relationship can also be set, and the charging strategy correspondence relationship can include multiple charging cut-off voltages, and the charging current rate and the static time corresponding to each of the charging cut-off voltages, so as to use the charging strategy correspondence relationship to generate a second charging message to implement a variable current intermittent charging strategy. Through this strategy, the chemical reaction inside the lithium battery can be sufficient, and the concentration polarization and ohmic polarization can be naturally eliminated, thereby reducing the voltage inside the lithium battery, so that the next round of constant current charging can proceed more smoothly, and the battery can absorb more electricity.

[0085] In one embodiment, Figure 4 As shown, a vehicle-to-vehicle charging method is provided, and the method is applied to Figure 1 Taking the vehicle controller 102 in FIG. 1 as an example, the method includes the following steps:

[0086] Step S401, when the BMS controller 101 of the target vehicle to be charged is started, receiving a charging message returned by the BMS controller 101; the charging message includes a first charging message and a second charging message, the first charging message is a charging message generated by the BMS controller 101 when the BMS information of the target vehicle meets a preset condition, and the second charging message is a charging message generated by the BMS controller 101 when the BMS information does not meet the preset condition.

[0087] Specifically, after being started, the BMS controller 101 of the target vehicle can collect the BMS information of the target vehicle and determine whether the BMS information meets the preset conditions. If so, it will send a first charging message to the vehicle controller 102. If the preset conditions are not met, it will send a second charging message to the vehicle controller 102. Therefore, the vehicle controller 102 can receive the first charging message or the second charging message sent when the BMS controller 101 of the target vehicle is started.

[0088] Step S402: when the charging message is a first charging message, generating a first power supply instruction; the first power supply instruction is used to instruct the power supply vehicle to perform power supply processing to heat the battery pack of the target vehicle;

[0089] Step S403, when the charging message is a second charging message, a second power supply instruction is generated; the second power supply instruction is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack.

[0090] The first power supply instruction refers to the power supply instruction generated after receiving the first charging message, and the second power supply instruction refers to the power supply instruction generated after receiving the second charging message, and the power supply instruction is used to control the power supply method of the power supply vehicle to the target vehicle. If it is the first power supply instruction, the power supply method of the power supply vehicle to the target vehicle is to heat and supply power to the battery pack of the target vehicle, and if it is the second power supply instruction, the power supply method of the power supply vehicle to the target vehicle is to charge the battery pack of the target vehicle.

[0091] Specifically, if the received charging message is the first charging message, the vehicle controller 102 can generate a first power supply instruction, which can instruct the power supply vehicle to supply power to the target vehicle to heat the battery pack of the target vehicle. If the received charging message is the second charging message, the vehicle controller 102 can generate a second power supply instruction, which can instruct the power supply vehicle to supply power to the target vehicle to charge the battery pack of the target vehicle.

[0092] In the above-mentioned vehicle-to-vehicle charging method, when the BMS controller 101 of the target vehicle to be charged is started, the vehicle controller 102 of the power supply vehicle receives the charging message returned by the BMS controller 101; the charging message includes a first charging message and a second charging message, the first charging message is a charging message generated by the BMS controller 101 when the BMS information of the target vehicle meets the preset conditions, and the second charging message is a charging message generated by the BMS controller 101 when the BMS information does not meet the preset conditions; when the charging message is the first charging message, a first power supply instruction is generated; the first power supply instruction is used to instruct the power supply vehicle to perform power supply processing to heat the battery pack of the target vehicle; when the charging message is the second charging message, a second power supply instruction is generated; the second power supply instruction is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack. According to the present application, when the power supply vehicle is charging the target vehicle, if the BMS controller 101 of the target vehicle is started, the BMS information of the target vehicle can be obtained, and it is determined whether the BMS information meets the preset conditions. If the conditions are met, a first charging message is generated and sent to the vehicle controller 102 of the power supply vehicle, so that the vehicle controller 102 generates a first power supply instruction to instruct the power supply vehicle to supply power to the target vehicle to heat the battery pack of the target vehicle. If the conditions are not met, a second charging message is generated and sent to the vehicle controller 102 of the power supply vehicle, so that the vehicle controller 102 generates a second power supply instruction to instruct the power supply vehicle to supply power to the target vehicle to charge the battery pack of the target vehicle. It can be seen that the BMS controller 101 of the target vehicle can identify the vehicle-to-vehicle charging mode based on the actual BMS information, and the vehicle controller 102 of the power supply vehicle can generate corresponding power supply instructions based on the identified charging mode to supply power. Therefore, it can be applied in different vehicle-to-vehicle charging application scenarios, and the intelligence of the vehicle-to-vehicle charging method can be improved in this way.

[0093] In one embodiment, before step S401, it may also include: when the power supply vehicle is connected to the target vehicle, if a vehicle message carrying the battery voltage of the target vehicle is received from the BMS controller, and the battery voltage reaches a preset battery voltage threshold, determining that the BMS controller is started; if no vehicle message is received, or the battery voltage of the target vehicle carried in the received vehicle message does not reach the preset battery voltage threshold, generating a battery power supply instruction; the battery power supply instruction is used to instruct the power supply vehicle to power the battery of the target vehicle so that the battery voltage reaches the preset battery voltage threshold.

[0094] In this embodiment, in order for the BMS controller 101 of the target vehicle to accurately feed back the first charging message or the second charging message, it is necessary to rely on the BMS controller 101 of the target vehicle being in the startup state, that is, the BMS controller 101 is in the whole vehicle working state. However, in fact, when the battery voltage of the target vehicle is low, the BMS controller 101 may not be able to start normally. In this case, the power supply vehicle is required to charge the battery of the target vehicle first, so that the BMS controller 101 can start normally after the battery voltage meets the conditions. The preset battery voltage threshold refers to the battery voltage that satisfies the condition of normal startup of the BMS controller 101, and the threshold can be preset.

[0095] Specifically, after the power supply vehicle is connected to the target vehicle, the power supply vehicle needs to first detect whether the BMS controller 101 of the target vehicle is started normally, and the detection method is to use the vehicle controller 102 to monitor and receive the vehicle message sent by the BMS controller 101 carrying the battery voltage of the target vehicle. If the vehicle message sent by the BMS controller 101 is received, and the battery voltage carried in the vehicle message reaches the preset battery voltage threshold, the power supply vehicle will determine that the current BMS controller 101 is in a normal startup state, and then wait to receive the charging message returned by the BMS controller 101.

[0096] If the vehicle controller 102 receives a vehicle message sent by the BMS controller 101, or the battery voltage carried in the vehicle message does not reach the preset battery voltage threshold, it means that the BMS controller 101 is in a state of abnormal startup. In this case, the vehicle controller 102 needs to generate a battery power supply instruction to instruct the power supply vehicle to power the battery of the target vehicle so that the battery voltage of the target vehicle can reach the preset battery voltage threshold to ensure that the BMS controller 101 can start normally.

[0097] In this embodiment, when the power supply vehicle is connected to the target vehicle, the vehicle controller 102 can receive the vehicle message sent by the BMS controller 101, and the vehicle message can carry the battery voltage. If the battery voltage carried in the vehicle message received by the vehicle controller 102 meets the preset battery voltage threshold, it is determined that the BMS controller 101 is started normally. If the vehicle message is not received or the battery voltage does not reach the preset battery voltage threshold, the battery of the target vehicle can be powered to ensure the normal startup of the BMS controller 101. In this way, it can be ensured that the BMS controller 101 can send a charging message when it is normally started, further improving the intelligence of vehicle-to-vehicle charging.

[0098] In one embodiment, the first charging message carries a target power; the target power is determined by the BMS controller 101 of the target vehicle based on the target temperature to be heated; step S402 may further include: when the charging message is the first charging message, obtaining the target power from the first charging message; generating a first power supply instruction according to the target power; the first power supply instruction is used to instruct the power supply vehicle to perform power supply processing according to the target power to heat the battery pack to the target temperature.

[0099] In this embodiment, the first charging message may carry information about the amount of electricity that needs to be charged, that is, the target amount of electricity, which is calculated by the BMS controller 101. The BMS controller 101 can collect the current temperature of the battery pack of the target vehicle and the target temperature to be heated, thereby calculating the target amount of electricity based on the current temperature and the target temperature. After receiving the first charging message, the vehicle controller 102 can extract the target amount of electricity from the first charging message to generate a first power supply instruction. The instruction can instruct the power supply vehicle to perform power supply processing according to the target amount of electricity, thereby heating the battery pack to the target temperature.

[0100] In this embodiment, if the received charging message is the first charging message, the vehicle controller 102 can also extract the target power from the first charging message to generate a first power supply instruction to instruct the power supply vehicle to perform power supply processing according to the target power and heat the battery pack to the target temperature. In this way, the control accuracy of the battery pack heating power supply mode can be further improved.

[0101] In addition, the second charging message carries a charging strategy correspondence relationship pre-constructed for the target vehicle; the charging strategy correspondence relationship includes multiple charging cut-off voltages, and the charging current rate and the static time corresponding to each charging cut-off voltage; step S403 may further include: when the charging message is the second charging message, obtaining multiple charging cut-off voltages in the charging strategy correspondence relationship, and the charging current rate and the static time corresponding to each charging cut-off voltage from the second charging message; generating a second power supply instruction according to the multiple charging cut-off voltages, and the charging current rate and the static time corresponding to each charging cut-off voltage; the second power supply instruction is used to instruct the power supply vehicle to obtain the current charging cut-off voltage from the multiple charging cut-off voltages, and the charging current rate corresponding to the current charging cut-off voltage; using the power supply of the target vehicle to charge the battery pack according to the charging current rate, and stop charging when the voltage of the battery pack reaches the current charging cut-off voltage; when the duration of stopping charging reaches the static time corresponding to the current charging cut-off voltage, the next charging cut-off voltage of the current charging cut-off voltage is used as the new current charging cut-off voltage, until the current charging cut-off voltage is the last one of the multiple charging cut-off voltages.

[0102] The second charging message may carry a pre-built charging strategy correspondence for the target vehicle, which may be provided by the BMS controller 101 and used for the power supply vehicle to adopt a variable current intermittent charging strategy to realize charging for the target vehicle. After obtaining the second charging message, the vehicle controller 102 may extract the charging strategy correspondence from the second charging message to generate a second power supply instruction. The instruction may instruct the power supply vehicle to supply power according to the above correspondence, that is, first identify the current charging cut-off voltage from multiple charging cut-off voltages, that is, identify the cut-off voltage for the first charge, and the charging current ratio corresponding to the current charging cut-off voltage, so as to charge according to the above charging current ratio, until the voltage of the battery pack reaches the current charging cut-off voltage and then stops charging, until the duration of stopping charging reaches the static duration corresponding to the current charging cut-off voltage, and the next charging cut-off voltage of the current charging cut-off voltage is used as the new current charging cut-off voltage, and the above process is repeated until the current charging cut-off voltage is the last one of the multiple charging cut-off voltages.

[0103] In this embodiment, if the received charging message is the second charging message, the vehicle controller 102 can also extract the charging strategy correspondence from the second charging message to generate a second power supply instruction to implement a variable current intermittent charging strategy. This strategy can enable the internal chemical reaction of the lithium battery to be sufficient, and the concentration polarization and ohmic polarization are naturally eliminated, thereby reducing the voltage inside the lithium battery, allowing the next round of constant current charging to proceed more smoothly, allowing the battery to absorb more electricity.

[0104] In one embodiment, a rescue vehicle vehicle-to-vehicle (V2V) intelligent charging method is also provided, which can identify the specific working condition of the rescued vehicle and then execute the corresponding rescue mode. It is specifically implemented through the following process:

[0105] 1. V2V intelligent rescue mode for 12V battery recharge:

[0106] In extremely cold conditions, the 12V small battery is prone to power outage, causing the vehicle to be unable to start and the dashboard to be unable to be turned on. Similarly, after using the rescue vehicle's high voltage to recharge the small battery, it is necessary to determine whether the battery needs heating or recharging. If the battery only needs heating, refer to the V2V battery pack heating principle. If it is determined that the battery pack needs to be charged, refer to the V2V intelligent rescue mode battery pack charging principle. Similarly, the interactive steps refer to the V2V intelligent rescue mode battery pack heating principle, except that the battery voltage required in the BCP battery parameter configuration sends the bus voltage of the rescued vehicle, which is converted to recharge the small battery through DCDC. After the small battery is recharged, the dashboard displays the data. After each controller wakes up, it decides whether to enter the battery pack heating or battery pack recharging mode.

[0107] like Figure 5 As shown, by design Figure 5 In the high-voltage architecture shown, the battery is hung at the rear end of the relay. When it is found that the rescued vehicle cannot be started, the DC V2V gun is inserted. Then the rescue vehicle clicks the rescue switch, closes the rescue vehicle's fast charging positive and fast charging negative relays, and lets the GCU and EMS work to provide high-voltage power to the DCDC. The DCDC then converts the high-voltage electricity into low-voltage electricity of about 14V to replenish the battery. When the vehicle can be started, choose to enter the corresponding rescue mode.

[0108] 2. Principle of battery pack heating in V2V intelligent rescue mode:

[0109] At present, the heating principle of the battery pack of new energy vehicles mainly relies on heating film. Then V2V provides power output when heating the battery pack of the charging vehicle through other rescue vehicles.

[0110] The first step is to confirm that the battery pack is "frozen" in power. First, start and wake up the vehicle, read the stored SOC display value sent by the BMS after power-on, and when the battery pack SOC is greater than 50% (TBD can be determined based on the range calculated by the VCU energy management module, and this range is calibrated based on the distance from the customer to the actual charging station), but the discharge power of the BMS is 0, it is identified as the first case, that is, the vehicle is charged by a rescue vehicle, but at this time the current mainly flows to the battery heating film, and the rescued vehicle sends "rescue mode 1" to the rescue vehicle.

[0111] The main implementation process can be divided into the following steps:

[0112] (1) The rescue vehicle and the rescued vehicle are started at the same time, the low voltage is closed, the instrument is lit, and the two vehicles are connected together using a V2V gun. After clicking "Smart Rescue Mode" on the large screen of the rescue vehicle, CAN communication interaction is carried out through the V2V gun. The rescued vehicle determines that the SOC is higher than 50% (TBD) at this time, but the maximum discharge power of the BMS is 0, and the maximum battery cell temperature of the BMS is also less than 0°. In this case, the rescued vehicle controls the heating film relay to close or disconnect.

[0113] (2) The rescue vehicle starts to communicate with the rescued vehicle. First, the rescue vehicle sends a CHM message. After receiving the BHM message from the rescued vehicle, it performs an insulation test and powers off for the first time. Then, after closing the fast charging relay, it powers on for the first time to output the insulation test. After the insulation test is completed, the rescue vehicle performs a second power-off process for active discharge and disconnects the fast charging relay to avoid voltage shock to the battery load during the re-discharge phase.

[0114] (3) Communicate and interact with the rescued vehicle, send CRM, receive BRM, regularly receive BCP, and finally send CRO (which includes the charging parameters of the battery heating film of the rescued vehicle, maximum voltage, maximum current, allowable temperature, SOC, etc.), and then perform the second power-on to start the range extender using the power battery; when the rescue vehicle GCU mode is voltage control, perform the third power-off to disconnect the power battery range extender for independent power supply; when the GCU mode is high-voltage standby and the tube is turned off, the GCU voltage regulation is completed and the energy transmission process officially begins.

[0115] (4) In addition, the rescued vehicle calculates the amount of electricity required to heat the heating film to the target temperature, mainly referring to the table below. The table below selects different battery temperatures as the starting temperature for heating. A heating test is then performed, with -10℃ to -5℃ as a heating range. By fitting a piecewise function, the amount of electricity required to heat from the current temperature to the target temperature can be calculated.

[0116] For example, Table 1 is a corresponding relationship table of heating power when the target temperature is 25°C. N1 to N6 are obtained through experiments. N1 represents the power required to heat from -10°C to the target temperature, and so on, N2 to N6 also represent the same meaning. This table can be obtained through a large amount of actual test data, and can also be obtained by selecting multiple groups of test data with target temperatures of 20°C, 21°C, 22°C, etc.

[0117] In addition, according to the DC V2V principle, such as Figure 6 As shown, Figure 6 This is the electrical schematic diagram for providing power heating to the battery membrane. In this case, the GCU range extender is mainly used to generate electricity to provide the power required for the heating membrane of the rescued vehicle to work. When the rescue vehicle clicks "Smart Rescue Mode", the rescued vehicle wakes up and determines that the current scene is "Rescue Mode 1". Normal functional interaction is performed. The rescued vehicle closes the fast charging positive and fast charging negative relays, and then the rescued vehicle closes the heating positive and heating negative relays to start heating the battery pack.

[0118] 3. Principle of battery pack charging in V2V intelligent rescue mode:

[0119] The rescued vehicle can be awakened normally. After clicking "Smart Rescue Mode", insert the V2V gun for interactive communication. After receiving the rescue vehicle information, it is consistent with the interactive principle of the battery pack heating principle of the above 1V2V smart rescue mode. According to the "Rescue Mode 2" sent by the rescued vehicle, in the V2V charging process, constant voltage mode and constant current mode are used for charging to increase the charging rate.

[0120] When entering DC V2V charging, this embodiment selects a charging strategy different from conventional charging, namely, a variable current intermittent charging strategy. Currently, the charging strategies are mainly divided into a cross-current charging strategy, a constant current and constant voltage charging strategy, a multi-stage constant current charging strategy, a variable current intermittent charging strategy, and a pulse charging strategy; the variable current intermittent charging strategy has little effect on the battery's charging time, the available capacity charged, and the battery's temperature rise;

[0121] Principle of variable current intermittent charging strategy: In the first stage, this strategy first charges the battery to the upper cut-off voltage with a constant current, then leaves it to rest for a period of time, jumps to the next stage, and so on. Through intermittent charging, the chemical reaction inside the lithium battery is sufficient, and the concentration polarization and ohmic polarization are naturally eliminated, thereby reducing the voltage inside the lithium battery, allowing the next round of constant current charging to proceed more smoothly and allowing the battery to absorb more electricity.

[0122] When you want to ensure that the battery has a large capacity, you can choose to increase the number of charging stages. Although this will increase the remaining charging time, it can ensure the health of the battery. For example, if the full charge voltage is 3.65V, as shown in Table 2, Table 2 is an example of a variable current intermittent charging strategy. The specific standing time and charging rate can be calibrated through a large number of test benches and actual vehicle charging tests.

[0123] Detailed calibration process, for example, when the entire charging process is divided into 4 static target voltages in the above table, and the static time of each voltage is also executed according to the above table, then different powers can be selected for calibration testing. For example, 3.6V uses 1.1C charging current, 3.62V uses 0.6C current, 3.64V uses 0.3C, and 3.65V uses 0.15C. In short, under the same static time, the overall capacity of the battery is guaranteed to be the highest and closest to the rated capacity. Then this power calibration is the best solution, and the calibration of the static time is similar to the same principle.

[0124] According to the above principle, different charging rates for the static target voltage are set, and then the charging rate at which the overall charging capacity reaches the highest when the static target voltage is charged is calibrated from multiple charging rates. For example, when the full charge cut-off voltage is about 3.65V, different charging rates are selected. According to the content in the above table, different rates can be selected when the charging voltage does not reach 3.6V. For example, the corresponding relationship between each static target voltage and the charging rate can be shown in Table 3:

[0125] Table 3 Correspondence between static target voltage and charging rate

[0126]

[0127] The following are examples of the rest time to reach each target voltage: 5S at 3.58V, 10S at 3.6V, 20S at 3.62V, and 60S at 3.64V to determine the charging capacity.

[0128] I = rated capacity × charging rate;

[0129]

[0130] in, Indicates the charging capacity.

[0131] In summary, when the total charging capacity is maximized when the target charging voltage is reached, it is the optimal charging parameter calibration result.

[0132] In addition, according to the DC V2V principle, if Figure 7 As shown, Figure 7 It is an electrical schematic diagram for battery charging. When the rescue vehicle clicks "Smart Rescue Mode", the rescued vehicle is awakened and determines that the current scene is "Rescue Mode 2". Normal functional interaction is performed, and the rescued vehicle closes the fast charge positive and fast charge negative relays to start charging the battery pack.

[0133] Based on the above process, whether it is "rescue mode 1" or "rescue mode 2", the overall interaction process can be as follows: Figure 8 As shown, after clicking the smart rescue mode, the rescue mode can be obtained by the BMS of the rescued vehicle and after completing the insulation test, the rescue vehicle, i.e. the charging vehicle, starts the range extender to prepare for charging. If it is rescue mode 1, the rescued vehicle interacts with the charging vehicle and closes the heating relay. If it is rescue mode 2, the rescued vehicle interacts with the charging vehicle and closes the fast charging relay.

[0134] Through this embodiment, the specific working condition type of the rescued vehicle can be intelligently identified, and then the corresponding rescue mode is executed, thereby improving the intelligence level of V2V charging rescue.

[0135] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0136] Based on the same inventive concept, the embodiment of the present application also provides a vehicle-to-vehicle charging device for implementing the vehicle-to-vehicle charging method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more vehicle-to-vehicle charging device embodiments provided below can refer to the limitations of the vehicle-to-vehicle charging method above, and will not be repeated here.

[0137] In one embodiment, Fig. 9 As shown, a vehicle-to-vehicle charging device is provided, which is applied to a BMS controller of a target vehicle to be charged, including: a BMS information acquisition module 901, a first message generation module 902 and a second message generation module 903, wherein:

[0138] A BMS information acquisition module 901, used to acquire the BMS information of the target vehicle when the BMS controller is started;

[0139] A first message generating module 902 is used to generate a first charging message when the BMS information meets a preset condition, and send the first charging message to a vehicle controller of a power supply vehicle that performs power supply processing on the target vehicle; the first charging message is used to instruct the power supply vehicle to perform power supply processing to heat the battery pack of the target vehicle;

[0140] The second message generation module 903 is used to generate a second charging message when the BMS information does not meet the preset conditions, and send the second charging message to the vehicle controller of the power supply vehicle; the second charging message is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack.

[0141] In one embodiment, the BMS information includes at least one of the battery capacity of the target vehicle, the maximum discharge power of the BMS controller, the maximum battery cell temperature of the BMS controller, and a heating signal triggered by the BMS controller; the vehicle-to-vehicle charging device also includes: a BMS information identification module, for determining that the BMS information meets a preset condition when the BMS information includes the heating signal; if the BMS information does not include the heating signal, identifying whether the BMS information meets the preset condition based on the battery capacity, the maximum discharge power and the maximum battery cell temperature.

[0142] In one embodiment, the BMS information identification module is further used to determine that the BMS information satisfies the preset condition when the battery capacity is greater than a preset battery capacity threshold, the maximum discharge power is zero, and the maximum battery cell temperature is less than a preset temperature threshold; and to determine that the BMS information does not satisfy the preset condition when one of the following conditions is met: the battery capacity is not greater than a preset battery capacity threshold, the maximum discharge power is not zero, or the maximum battery cell temperature is not less than a preset temperature threshold.

[0143] In one embodiment, the first message generation module 902 is further used to obtain the target temperature to be heated, and a heating power correspondence relationship pre-constructed for the target temperature; the heating power correspondence relationship stores the power required to output when heating different starting temperatures to the target temperature; according to the current temperature of the battery pack and the heating power correspondence relationship, the target power required to output when heating the current temperature to the target temperature is obtained, and the first charging message is generated based on the target power; the first charging message is used to instruct the power supply vehicle to perform power supply processing according to the target power so as to heat the battery pack to the target temperature.

[0144] In one embodiment, the second message generation module 903 is further used to obtain a charging strategy correspondence relationship pre-constructed for the target vehicle; the charging strategy correspondence relationship includes multiple charging cut-off voltages, and the charging current rate and the static time corresponding to each of the charging cut-off voltages; the second charging message is generated according to the charging strategy correspondence relationship; the second charging message is used to instruct the power supply vehicle to obtain the current charging cut-off voltage from the multiple charging cut-off voltages, and the charging current rate corresponding to the current charging cut-off voltage; the battery pack is charged according to the charging current rate using the power supply of the target vehicle, and the charging is stopped when the voltage of the battery pack reaches the current charging cut-off voltage; when the duration of stopping charging reaches the static time corresponding to the current charging cut-off voltage, the next charging cut-off voltage of the current charging cut-off voltage is used as the new current charging cut-off voltage, until the current charging cut-off voltage is the last one of the multiple charging cut-off voltages.

[0145] In one embodiment, Fig.10 As shown, a vehicle-to-vehicle charging device is provided, which is applied to a vehicle controller of a power supply vehicle, including: a charging message receiving module 1001, a first instruction generating module 1002 and a second instruction generating module 1003, wherein:

[0146] A charging message receiving module 1001 is used to receive a charging message returned by the BMS controller when the BMS controller of the target vehicle to be charged is started; the charging message includes a first charging message and a second charging message, the first charging message is a charging message generated by the BMS controller when the BMS information of the target vehicle meets a preset condition, and the second charging message is a charging message generated by the BMS controller when the BMS information does not meet the preset condition;

[0147] A first instruction generating module 1002 is used to generate a first power supply instruction when the charging message is the first charging message; the first power supply instruction is used to instruct the power supply vehicle to perform a power supply process to heat the battery pack of the target vehicle;

[0148] The second instruction generating module 1003 is used to generate a second power supply instruction when the charging message is the second charging message; the second power supply instruction is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack.

[0149] In one embodiment, the charging message receiving module 1001 is also used to determine that the BMS controller is started if a vehicle message carrying the battery voltage of the target vehicle is received from the BMS controller and the battery voltage reaches a preset battery voltage threshold when the power supply vehicle is connected to the target vehicle; if the vehicle message is not received, or the battery voltage of the target vehicle carried in the received vehicle message does not reach the preset battery voltage threshold, generate a battery power supply instruction; the battery power supply instruction is used to instruct the power supply vehicle to power the battery of the target vehicle so that the battery voltage reaches the preset battery voltage threshold.

[0150] In one embodiment, the first charging message carries a target power; the target power is determined by the BMS controller of the target vehicle based on the target temperature to be heated; the first instruction generation module 1002 is further used to obtain the target power from the first charging message when the charging message is the first charging message; generate the first power supply instruction according to the target power; the first power supply instruction is used to instruct the power supply vehicle to perform power supply processing according to the target power to heat the battery pack to the target temperature.

[0151] In one embodiment, the second charging message carries a charging strategy correspondence relationship pre-constructed for the target vehicle; the charging strategy correspondence relationship includes multiple charging cut-off voltages, and the charging current multiple and the standing time corresponding to each of the charging cut-off voltages; the second instruction generating module 1003 is further used to obtain the multiple charging cut-off voltages in the charging strategy correspondence relationship, and the charging current multiple and the standing time corresponding to each of the charging cut-off voltages from the second charging message when the charging message is the second charging message; and generate the charging strategy correspondence relationship according to the multiple charging cut-off voltages, and the charging current multiple and the standing time corresponding to each of the charging cut-off voltages. The second power supply instruction is used to instruct the power supply vehicle to obtain a current charging cut-off voltage from a plurality of charging cut-off voltages, and a charging current multiple corresponding to the current charging cut-off voltage; the battery pack is charged according to the charging current multiple using the power supply of the target vehicle, and charging is stopped when the voltage of the battery pack reaches the current charging cut-off voltage; when the duration of charging stop reaches the standing time corresponding to the current charging cut-off voltage, the next charging cut-off voltage of the current charging cut-off voltage is used as the new current charging cut-off voltage, until the current charging cut-off voltage is the last one of the plurality of charging cut-off voltages.

[0152] Each module in the above-mentioned vehicle-to-vehicle charging device can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of the processor in the controller in the form of hardware, or can be stored in the memory in the controller in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0153] In an exemplary embodiment, a controller is provided, which may be a BMS controller or a vehicle controller, and its internal structure diagram may be as follows: Fig.11As shown. The controller includes a processor, a memory, an input / output interface and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the controller is used to provide computing and control capabilities. The memory of the controller includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the controller is used to exchange information between the processor and an external device. The communication interface of the controller is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (Near Field Communication, NFC) or other technologies. When the computer program is executed by the processor, a vehicle-to-vehicle charging method is implemented.

[0154] Those skilled in the art will understand that Fig.11 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the controller to which the scheme of the present application is applied. The specific controller may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0155] In one embodiment, a controller is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0156] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0157] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0158] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0159] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0160] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0161] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A vehicle-to-vehicle charging method, characterized in that: The method is applied to a BMS controller of a target vehicle to be charged, and includes: When the BMS controller is started, obtaining BMS information of the target vehicle; When the BMS information meets the preset conditions, a first charging message is generated, and the first charging message is sent to a vehicle controller of a power supply vehicle that performs power supply processing on the target vehicle; the first charging message is used to instruct the power supply vehicle to perform power supply processing to heat the battery pack of the target vehicle; When the BMS information does not meet the preset condition, a second charging message is generated and sent to the vehicle controller of the power supply vehicle; the second charging message is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack.

2. The method according to claim 1, characterized in that The BMS information includes at least one of a battery capacity of the target vehicle, a maximum discharge power of the BMS controller, a maximum cell temperature of the BMS controller, and a heating signal triggered by the BMS controller; After obtaining the BMS information of the target vehicle, the method further includes: In a case where the BMS information includes the heating signal, determining that the BMS information satisfies a preset condition; The heating signal is not included in the BMS information, and whether the BMS information meets the preset condition is identified according to the battery capacity, the maximum discharge power and the maximum battery cell temperature.

3. The method according to claim 2, characterized in that The identifying, according to the battery capacity, the maximum discharge power and the maximum battery cell temperature, whether the BMS information meets the preset condition includes: When the battery capacity is greater than a preset battery capacity threshold, the maximum discharge power is zero, and the maximum battery cell temperature is less than a preset temperature threshold, determining that the BMS information meets the preset condition; When one of the following conditions is met: the battery capacity is not greater than a preset battery capacity threshold, the maximum discharge power is not zero, or the maximum battery cell temperature is not less than a preset temperature threshold, it is determined that the BMS information does not meet the preset condition.

4. The method according to claim 1, characterized in that The generating a first charging message includes: Obtaining a target temperature to be heated and a heating power correspondence relationship pre-established for the target temperature; the heating power correspondence relationship stores the power output required to heat different starting temperatures to the target temperature; According to the current temperature of the battery pack and the corresponding relationship between the heating power, the target power output required to heat the current temperature to the target temperature is obtained, and the first charging message is generated based on the target power; the first charging message is used to instruct the power supply vehicle to perform power supply processing according to the target power so as to heat the battery pack to the target temperature.

5. The method according to claim 1, characterized in that The generating the second charging message includes: Obtaining a pre-built charging strategy correspondence relationship for the target vehicle; the charging strategy correspondence relationship includes a plurality of charging cut-off voltages, and a charging current multiple and a rest time corresponding to each of the charging cut-off voltages; The second charging message is generated according to the corresponding relationship of the charging strategy; the second charging message is used to instruct the power supply vehicle to obtain a current charging cut-off voltage from multiple charging cut-off voltages, and a charging current ratio corresponding to the current charging cut-off voltage; the battery pack is charged according to the charging current ratio using the power supply of the target vehicle, and charging is stopped when the voltage of the battery pack reaches the current charging cut-off voltage; when the duration of charging stop reaches the standing time corresponding to the current charging cut-off voltage, the next charging cut-off voltage of the current charging cut-off voltage is used as the new current charging cut-off voltage, until the current charging cut-off voltage is the last one of the multiple charging cut-off voltages.

6. A vehicle-to-vehicle charging method, characterized in that: A vehicle controller applied to a power supply vehicle, the method comprising: When the BMS controller of the target vehicle to be charged is started, receiving a charging message returned by the BMS controller; the charging message includes a first charging message and a second charging message, the first charging message is a charging message generated by the BMS controller when the BMS information of the target vehicle meets a preset condition, and the second charging message is a charging message generated by the BMS controller when the BMS information does not meet the preset condition; In the case where the charging message is the first charging message, a first power supply instruction is generated; the first power supply instruction is used to instruct the power supply vehicle to perform a power supply process to heat the battery pack of the target vehicle; In the case where the charging message is the second charging message, a second power supply instruction is generated; the second power supply instruction is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack.

7. The method according to claim 6, characterized in that When the BMS controller of the target vehicle to be charged is started, before receiving the charging message returned by the BMS controller, the method further includes: When the power supply vehicle is connected to the target vehicle, if a vehicle message carrying the battery voltage of the target vehicle is received from the BMS controller and the battery voltage reaches a preset battery voltage threshold, it is determined that the BMS controller is started; If the vehicle message cannot be received, or the battery voltage of the target vehicle carried in the received vehicle message does not reach the preset battery voltage threshold, a battery power supply instruction is generated; the battery power supply instruction is used to instruct the power supply vehicle to power the battery of the target vehicle so that the battery voltage reaches the preset battery voltage threshold.

8. The method according to claim 6, characterized in that The first charging message carries a target power; the target power is determined by the BMS controller of the target vehicle based on the target temperature to be heated; When the charging message is the first charging message, generating a first power supply instruction includes: When the charging message is the first charging message, obtaining the target power from the first charging message; The first power supply instruction is generated according to the target power quantity; the first power supply instruction is used to instruct the power supply vehicle to perform power supply processing according to the target power quantity so as to heat the battery pack to the target temperature.

9. The method according to claim 6, characterized in that The second charging message carries a charging strategy correspondence relationship pre-built for the target vehicle; the charging strategy correspondence relationship includes multiple charging cut-off voltages, and the charging current multiple and the static time corresponding to each of the charging cut-off voltages; When the charging message is the second charging message, generating a second power supply instruction includes: In the case where the charging message is the second charging message, a plurality of charging cut-off voltages in the corresponding relationship of the charging strategy, and the charging current multiple and the static time corresponding to each of the charging cut-off voltages are obtained from the second charging message; the second power supply instruction is generated according to the plurality of charging cut-off voltages, and the charging current multiple and the static time corresponding to each of the charging cut-off voltages; the second power supply instruction is used to instruct the power supply vehicle to obtain the current charging cut-off voltage from the plurality of charging cut-off voltages, and the charging current multiple corresponding to the current charging cut-off voltage; The battery pack is charged according to the charging current rate using the power supply of the target vehicle, and charging is stopped when the voltage of the battery pack reaches the current charging cut-off voltage; when the duration of charging stop reaches the static duration corresponding to the current charging cut-off voltage, the next charging cut-off voltage of the current charging cut-off voltage is used as the new current charging cut-off voltage, until the current charging cut-off voltage is the last one of multiple charging cut-off voltages.

10. A vehicle-to-vehicle charging device, characterized in that: A BMS controller applied to a target vehicle to be charged, the device comprising: A BMS information acquisition module, used to acquire the BMS information of the target vehicle when the BMS controller is started; A first message generating module, configured to generate a first charging message when the BMS information meets a preset condition, and send the first charging message to a vehicle controller of a power supply vehicle that performs power supply processing on the target vehicle; the first charging message is used to instruct the power supply vehicle to perform power supply processing to heat the battery pack of the target vehicle; The second message generation module is used to generate a second charging message when the BMS information does not meet the preset conditions, and send the second charging message to the vehicle controller of the power supply vehicle; the second charging message is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack.

11. A vehicle-to-vehicle charging device, characterized in that: A vehicle controller applied to a power supply vehicle, the device comprising: A charging message receiving module, used for receiving a charging message returned by the BMS controller when the BMS controller of the target vehicle to be charged is started; the charging message includes a first charging message and a second charging message, the first charging message is a charging message generated by the BMS controller when the BMS information of the target vehicle meets a preset condition, and the second charging message is a charging message generated by the BMS controller when the BMS information does not meet the preset condition; a first instruction generating module, configured to generate a first power supply instruction when the charging message is the first charging message; the first power supply instruction is used to instruct the power supply vehicle to perform a power supply process so as to heat the battery pack of the target vehicle; The second instruction generating module is used to generate a second power supply instruction when the charging message is the second charging message; the second power supply instruction is used to instruct the power supply vehicle to perform power supply processing to charge the battery pack.

12. A controller comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 9 are implemented.

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