A battery charging control method, device and new energy vehicle

Abstract

The present invention discloses a battery charging control method, device and new energy vehicle, which determines whether the new energy vehicle is in a dormant state; if the new energy vehicle is in a dormant state, the power domain controller actively wakes up every first period and determines whether the battery meets the first charging condition; if the battery meets the first charging condition, the battery charging is turned on; if the battery does not meet the first charging condition, when the battery power is less than the first power threshold, the battery management system actively wakes up every second period and sends the detected battery information to the power domain controller to determine whether the battery meets the second charging condition; if it does, the battery charging is turned on. In this way, the abnormal health state caused by the jump of the battery power SOC or the gap between the SOC and the terminal voltage due to the long-term use of the battery is effectively avoided, and the conditions for continuous monitoring of the battery terminal voltage are supplemented, without the need for additional hardware costs, and the occurrence of power shortage is more reasonably avoided.

Description

Technical Field

[0001] The present invention relates to the field of power supply control technology, and in particular to a battery charging control method, device and new energy vehicle. Background Art

[0002] At present, there are two main methods for charging the batteries of new energy vehicles. One method is to periodically wake up the vehicle and start the DC converter to charge the battery. However, since the wake-up cycle may be too long, the battery may be depleted during the wake-up cycle. In addition, this method cannot determine the battery status and the reliability of the battery status, which leads to insufficient control.

[0003] Therefore, how to better control the battery charging to avoid the risk of power shortage is the problem we need to solve at present. Summary of the invention

[0004] In view of the above problems, the present invention is proposed to provide a battery charging control method, device and new energy vehicle, which designs logic according to the battery terminal signal, improves the credibility of the need for charging and avoids the risk of power shortage.

[0005] According to a first aspect of the present invention, a battery charging control method is provided, which is applicable to new energy vehicles, comprising:

[0006] Determine whether the new energy vehicle is in a dormant state;

[0007] If the new energy vehicle is in a dormant state, the power domain controller actively wakes up at every first period and determines whether the battery meets the first charging condition;

[0008] If the battery meets the first charging condition, the battery charging is started;

[0009] If the battery does not meet the first charging condition, when the battery power is less than the first power threshold, the battery management system actively wakes up every second period and sends the detected battery information to the power domain controller to determine whether the battery meets the second charging condition;

[0010] If the second charging condition is met, the battery charging is started.

[0011] Optionally, determining whether the battery meets a first charging condition includes:

[0012] Obtain the battery power, battery terminal voltage, battery temperature and battery management system status detected by the battery management system;

[0013] If the battery power is less than the first threshold, the battery temperature is greater than the temperature threshold, and the interval time since the last battery replenishment is greater than the interval threshold, then the battery meets the first charging condition;

[0014] Or, if the battery power is less than the second threshold and the battery temperature is greater than the temperature threshold, the battery meets the first charging condition;

[0015] Or, if the battery terminal voltage is less than the voltage threshold and the battery temperature is greater than the temperature threshold, the battery meets the first charging condition;

[0016] Alternatively, if the battery management system is in a fault state, the battery temperature is greater than a temperature threshold, and the interval time since the battery was last recharged is greater than an interval threshold, the battery meets the first charging condition.

[0017] Optionally, determining whether the battery meets the second charging condition includes:

[0018] Obtaining battery information detected by the battery management system, wherein the battery information includes battery power, battery terminal voltage, static current, battery management system status, and battery temperature;

[0019] If the static current is less than or equal to the first current threshold, then the interval time since the last recharging of the battery is calculated;

[0020] Determining whether the battery meets the second charging condition according to the interval time, battery power, battery terminal voltage, battery temperature, and battery management system status;

[0021] If the static current is greater than the first current threshold, it is determined whether the battery meets the second charging condition based on the battery temperature and the state of the battery management system.

[0022] Optionally, judging whether the battery meets the second charging condition according to the interval time, the battery power, the battery terminal voltage, the battery temperature, and the battery management system state includes:

[0023] If the battery temperature is greater than the temperature threshold and the interval time is greater than the interval threshold, the battery meets the second charging condition;

[0024] Or, if the battery power is less than the second threshold and the battery temperature is greater than the temperature threshold, the battery meets the second charging condition;

[0025] Or, if the battery terminal voltage is less than the voltage threshold and the battery temperature is greater than the temperature threshold, the battery meets the second charging condition;

[0026] Alternatively, if the battery management system is in a fault state, the battery temperature is greater than a temperature threshold, and the interval time is greater than an interval threshold, the battery meets the second charging condition.

[0027] Optionally, judging whether the battery meets the second charging condition according to the battery temperature includes:

[0028] If the battery temperature is greater than the temperature threshold, the battery meets the second charging condition.

[0029] Optionally, the method further includes:

[0030] If the new energy vehicle is not in a dormant state and is in an awake state, the power domain controller makes a judgment based on the battery power, battery terminal voltage, and battery temperature detected by the battery management system;

[0031] If the battery power is less than the second threshold and the battery temperature is greater than the temperature threshold, the battery starts to replenish power;

[0032] Or, if the battery terminal voltage is less than the voltage threshold and the battery temperature is greater than the temperature threshold, the battery starts to replenish power.

[0033] Optionally, if the new energy vehicle is in a non-dormant state and is in a high-voltage state, whether the new energy vehicle exits the charging state is determined based on the battery power, the charging current, and the accumulated time the high voltage is maintained.

[0034] Optionally, whether the new energy vehicle should exit the charging process is determined based on the battery power, charging current, and accumulated high voltage maintenance time, including:

[0035] If the battery power is 100% and the charging current is less than the second current threshold within the first preset time, the battery will exit the charging mode;

[0036] Or, if the accumulated time of maintaining the high voltage is greater than the second preset time, the battery will quit charging.

[0037] Optionally, before the power domain controller actively wakes up at each first interval period and determines whether the battery meets the first charging condition, the method further includes:

[0038] Obtain the gear status, front hood and trunk lid status, power battery power, and vehicle software upgrade status of new energy vehicles;

[0039] If the gear position is P, the front hood and trunk lid are closed, the power battery power is greater than 5%, and the vehicle is in a non-software upgrade state, the power domain controller will actively wake up every first cycle.

[0040] According to a second aspect of the present invention, there is provided a battery charging control device, comprising:

[0041] A judgment module is used to judge whether the new energy vehicle is in a dormant state;

[0042] The first processing module is used for, when the new energy vehicle is in a dormant state, the power domain controller actively wakes up at intervals of a first period, and determines whether the battery meets the first charging condition; if the battery meets the first charging condition, the battery charging is started;

[0043] The second processing module is used for actively waking up the battery management system every second period when the battery does not meet the first charging condition. The battery management system sends the detected battery information to the power domain controller to determine whether the battery meets the second charging condition. If the second charging condition is met, the battery charging is started.

[0044] According to a third aspect of the present invention, there is provided a new energy vehicle, comprising a vehicle body and a battery arranged in the vehicle body, wherein the battery is applicable to the aforementioned battery charging method.

[0045] The above one or more technical solutions in the embodiments of this specification have at least the following technical effects:

[0046] The embodiments of this specification provide a battery charging control method, device and new energy vehicle, which determines whether the new energy vehicle is in a dormant state; if the new energy vehicle is in a dormant state, the power domain controller actively wakes up every first period and determines whether the battery meets the first charging condition; if the battery meets the first charging condition, the battery charging is turned on; if the battery does not meet the first charging condition, when the battery power is less than the first power threshold, the battery management system actively wakes up every second period and sends the detected battery information to the power domain controller to determine whether the battery meets the second charging condition; if the second charging condition is met, the battery charging is turned on. In this way, the abnormal health state caused by the jump of the battery power SOC or the gap between the SOC and the terminal voltage due to the long-term use of the battery is effectively avoided, and the conditions for continuous monitoring of the battery terminal voltage are supplemented, without the need for additional hardware costs, and the occurrence of power shortage is more reasonably avoided.

[0047] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference figures are used to represent the same parts throughout the accompanying drawings.

[0049] In the attached picture:

[0050] Figure 1 A flow chart of a battery charging control method in an embodiment of the present invention is shown.

[0051] Figure 2 A block diagram of a battery charging control device in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0053] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0055] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Combination Figure 1 The flowchart of the battery charging control method shown in FIG. 1 is a flowchart of the battery charging control method shown in FIG. 1 . The present embodiment provides a battery charging control method applied to new energy vehicles. The method includes steps 101 to 105:

[0057] Step 101: Determine whether the new energy vehicle is in a dormant state;

[0058] The battery may need to be recharged when the vehicle is in a dormant state, awakened state, or in a high-voltage state. The conditions for determining whether the battery needs to be recharged may vary slightly in different scenarios. The awakened state and the high-voltage state are both non-dormant states. Based on this, in the above steps, it can be determined whether the vehicle is in a dormant state.

[0059] Usually, when the vehicle is locked and powered off, if the temperature of the power battery module is too high at this time, the entire vehicle needs to be kept awake and wait for the thermal management module to complete physical cooling. At the same time, the controller will delay for a certain period of time and cancel all controller wake-up sources. The device ID is revoked by the regional controller to complete the power-off process of the on-board controller. At this time, the power domain controller determines that the sleep conditions are met and sends ReleaseCom to the network management module to release network communication RequestPowerOff to allow the central controller to sleep. At this time, the application frame message of the vehicle-side diagnostic port and the network management module message stop sending, and the vehicle is in sleep state.

[0060] Step 102: If the new energy vehicle is in a dormant state, the power domain controller actively wakes up at intervals of a first period and determines whether the battery meets a first charging condition;

[0061] When the above steps determine that the new energy vehicle is in a dormant state, the power domain controller also goes into dormancy, but will actively wake up every first period. In this embodiment, the first period can be 12 hours, that is, the power domain controller actively wakes up every 12 hours. After the power domain controller actively wakes up, it will determine whether the battery meets the first charging condition based on information such as the battery power, battery terminal voltage, and battery temperature. It should be noted that before determining whether the battery meets the first charging condition, it also includes:

[0062] Obtain the gear status, front hood and trunk lid status, power battery power, and vehicle software upgrade status of new energy vehicles;

[0063] If the gear position is P, the front hood and trunk lid are closed, the power battery power is greater than 5%, and the vehicle is in a non-software upgrade state, the power domain controller will actively wake up every first cycle.

[0064] In an optional implementation, determining whether the battery meets the first charging condition includes:

[0065] Obtain the battery power, battery terminal voltage, battery temperature and battery management system status detected by the battery management system;

[0066] If the battery power is less than the first threshold, the battery temperature is greater than the temperature threshold, and the interval time since the last battery replenishment is greater than the interval threshold, then the battery meets the first charging condition;

[0067] Or, if the battery power is less than the second threshold and the battery temperature is greater than the temperature threshold, the battery meets the first charging condition;

[0068] Or, if the battery terminal voltage is less than the voltage threshold and the battery temperature is greater than the temperature threshold, the battery meets the first charging condition;

[0069] Alternatively, if the battery management system is in a fault state, the battery temperature is greater than a temperature threshold, and the interval time since the battery was last recharged is greater than an interval threshold, the battery meets the first charging condition.

[0070] In general, the first charging condition mainly depends on the battery power, battery terminal voltage, battery temperature, interval time and battery management system status. Different logical combinations of the above conditions are used to determine whether the battery needs to be recharged.

[0071] Two thresholds are set for the battery power, namely the first threshold and the second threshold, and the second threshold is less than the first threshold. In this embodiment, the first threshold can be 75%, and the second cycle threshold can be 45%. When the battery power is less than the first threshold, it means that the battery power is a little low; when the battery power is less than the second threshold, it means that the battery power is already very low. The battery temperature refers to the current temperature of the battery. The battery temperature detection is set to determine whether the battery can be replenished under the current circumstances. Because if the temperature is too low, for example, below -30 degrees, the battery will be chemically deactivated at low temperature, and even if it needs to be replenished, it is impossible to replenish the battery. The interval time refers to the time since the last time the battery was replenished. Information such as the battery power, the battery terminal voltage, and the battery temperature are all detected by the battery management system. The battery management system state is used to characterize the credibility of the information detected by the battery management system. The battery management system state includes fault and non-fault states. If it is a fault state, it means that the value of the information detected by the battery management system is unreliable. On the contrary, if the battery management system state is non-fault, it means that the value of the information detected by the battery management system is credible.

[0072] Based on the above information, a certain logical combination is performed to form a first charging condition. That is, if the battery power is less than the first threshold, the battery temperature is greater than the temperature threshold, and the interval time since the last battery recharge is greater than the interval threshold, the battery meets the first charging condition. Among them, in this embodiment, the temperature threshold can be 0 degrees, and the interval threshold can be 12 hours. For example, when the power domain controller actively wakes up after an interval of 12 hours from the first cycle, the battery management system detects that the battery power is 60%, which is less than the first threshold of 75%, and the battery temperature is 12 degrees, which is greater than the temperature threshold of 0 degrees, and the interval time since the last battery recharge is 15 hours, which is greater than the interval threshold of 12 hours, then the battery meets the first charging condition, and the power domain controller can wake up its controller to start recharging the battery.

[0073] Alternatively, if the battery power is less than the second threshold and the battery temperature is greater than the temperature threshold, the battery meets the first charging condition. For example, when the power domain controller actively wakes up after the first cycle of 12 hours, the battery management system detects that the battery power is 30%, which is less than the second threshold of 45%, and the battery temperature is 32 degrees, which is greater than the temperature threshold of 0 degrees, then the battery meets the first charging condition, and the power domain controller can wake up its controller to start charging the battery. At this time, there is no need to see whether the interval time is greater than the interval threshold, because the battery power is already very low and needs to be charged immediately.

[0074] Alternatively, if the battery terminal voltage is less than the voltage threshold and the battery temperature is greater than the temperature threshold, the battery meets the first charging condition; wherein, in this embodiment, the voltage threshold may be 11.2 V. For example, when the power domain controller actively wakes up after 12 hours of the first cycle, the battery management system detects that the battery terminal voltage is 10 V, which is less than the voltage threshold of 11.2 V, and the battery temperature is 24 degrees, which is greater than the temperature threshold, then the battery meets the first charging condition, and the power domain controller may wake up its controller to start charging the battery.

[0075] Alternatively, if the battery management system is in a faulty state, the battery temperature is greater than the temperature threshold, and the interval time since the last battery recharge is greater than the interval threshold, the battery meets the first charging condition. Among them, as mentioned above, if the battery management system is in a faulty state, the value of the information detected by the battery management system is unreliable. At this time, there is no need to look at the battery power or the battery terminal voltage. It only needs to be confirmed that the battery temperature is greater than the temperature threshold to confirm that the battery can be charged. After the interval time reaches the requirement, the battery can be recharged, which is equivalent to recharging the battery regularly. For example, when the power domain controller actively wakes up after the first cycle of 12 hours, and the battery management system is faulty, the battery terminal voltage and battery power are no longer considered. You only need to pay attention to the battery temperature. If the battery temperature is 40 degrees, which is greater than the temperature threshold of 0 degrees, and the interval time is greater than the interval threshold of 12 hours, the battery can be recharged.

[0076] It should be noted that if the battery management system is in a non-faulty state, there is no need to specify it during the logical combination, because it is an abnormal state only when there is a fault. Under normal circumstances, the battery management system is assumed to be in a non-faulty state during logical judgment.

[0077] Step 103: If the battery meets the first charging condition, start the battery charging;

[0078] In this embodiment, if the information detected by the battery management system is sent to the power domain controller, and the power domain controller determines that the first charging condition is met, it will wake up other controllers and related components and use the power battery to recharge the battery, provided that the power battery's power level needs to meet certain requirements, that is, the power battery's power level must be greater than 5%.

[0079] Step 104: If the battery does not meet the first charging condition, when the battery power is less than the first power threshold, the battery management system actively wakes up every second period and sends the detected battery information to the power domain controller to determine whether the battery meets the second charging condition;

[0080] Among them, when judging whether the battery meets the first charging condition, there are two results. One is that the first charging condition is met. If it is met, the battery is recharged; the other result is that the first charging condition is not met. If the battery does not meet the first charging condition, the power domain controller will continue to enter the sleep state, and after another first cycle, the power domain controller will wake up again. However, since the first cycle is generally long, during this period, in order to avoid battery power feeding, the battery management system will detect the battery power, and when it is detected that the battery power is less than the first power threshold, the battery management system will automatically wake up every second cycle, and the second cycle is less than the first cycle. In addition, the first power threshold is greater than or equal to the first threshold. In this embodiment, the first power threshold can be taken to be the same as the first threshold.

[0081] In this embodiment, the second cycle can be 1 hour. The battery management system automatically wakes up to detect the battery condition, the battery power, the battery terminal voltage and the battery temperature, and sends these to the power domain controller. The power domain controller will wake up briefly, usually for about 90 seconds. The power domain controller makes a logical judgment based on this information to determine whether the second charging condition is met. The second charging condition is a supplementary judgment that the battery power is between the first threshold and the second threshold.

[0082] The second charging condition is similar to the first charging condition, but slightly different, including:

[0083] Obtaining battery information detected by the battery management system, wherein the battery information includes battery power, battery terminal voltage, static current, battery management system status, and battery temperature;

[0084] If the static current is less than or equal to the first current threshold, then the interval time since the last recharging of the battery is calculated;

[0085] Determining whether the battery meets the second charging condition according to the interval time, battery power, battery terminal voltage, battery temperature, and battery management system status;

[0086] If the static current is greater than the first current threshold, it is determined whether the battery meets the second charging condition based on the battery temperature.

[0087] The battery management system actively wakes up once every second cycle and sends the detected battery-related information to the power domain controller. The power domain controller makes logical judgments based on the acquired battery power, battery terminal voltage, static current, battery management system status, and battery temperature:

[0088] When making a judgment, the power domain controller first compares the static current with the first current threshold. If the static current is less than or equal to the first current threshold, it means that the dark current is normal. If the static current is greater than the first current threshold, it means that the vehicle's low-voltage power consumption is too high and the dark current is abnormal. If the dark current is abnormal, the battery power will drop rapidly. Among them, the first current threshold is generally set according to the battery capacity. For example, the first current threshold is n*10mA, where n is a multiple of 10.

[0089] If the static current is less than or equal to the first current threshold, judging whether the battery meets the second charging condition according to the interval time, the battery power, the battery terminal voltage, the battery temperature, and the battery management system status, the specific judging steps may include:

[0090] If the battery temperature is greater than the temperature threshold and the interval time is greater than the interval threshold, the battery meets the second charging condition; wherein, the battery temperature is greater than the temperature threshold, indicating that the battery has not been chemically deactivated at low temperature and the battery can be replenished. The interval time is greater than the interval threshold, indicating that the battery's last replenishment distance is now greater than the interval threshold, avoiding frequent replenishment.

[0091] Or, if the battery power is less than the second threshold and the battery temperature is greater than the temperature threshold, the battery meets the second charging condition; wherein, the battery power is less than the second threshold, indicating that the battery power is extremely low at this time, as long as the battery temperature is greater than the temperature threshold, the battery can be recharged, and there is no need to consider the interval time at this time.

[0092] Or, if the battery terminal voltage is less than the voltage threshold and the battery temperature is greater than the temperature threshold, the battery meets the second charging condition;

[0093] Or, if the battery management system is in a fault state, the battery temperature is greater than the temperature threshold, and the interval time is greater than the interval threshold, the battery meets the second charging condition. The aforementioned situations all assume that the battery management system is in a non-fault state by default, but this time the battery management system is in a fault state, which means that the battery power and battery terminal voltage information detected by the battery management system are unreliable. At this time, as long as the battery temperature meets the temperature threshold, it can be recharged every interval time, which can also be understood as recharging on time to prevent the battery from being insufficient.

[0094] When the dark current of the battery is abnormal, that is, if the static current is greater than the first current threshold, it is determined whether the battery meets the second charging condition according to the battery temperature. The specific determination steps may include:

[0095] If the battery temperature is greater than the temperature threshold, the battery meets the second charging condition; at this time, the battery dark current is abnormal and the battery power consumption rate will be very fast. As long as the battery temperature meets the temperature threshold, the battery can be replenished and the battery will be recharged immediately.

[0096] Step 105: If the second charging condition is met, start battery charging.

[0097] It should be noted that only when the first charging condition is not met, is it determined whether the second charging condition is met. If the second charging condition is met, the battery recharge is turned on. Of course, if the second charging condition is not met, the battery management system continues to actively wake up every second period until the battery power is replenished to a level greater than the first power threshold. The recharge situation is not only to meet the first charging condition or the second charging condition, but also other situations. For example, during the process of charging the power battery, the battery will also be recharged at the same time; or when the vehicle is awakened and is in a non-sleeping state, and certain conditions are met, the battery will also be recharged.

[0098] In detail:

[0099] If the new energy vehicle is not in a dormant state and is in an awake state, the power domain controller makes a judgment based on the battery power, battery terminal voltage, and battery temperature detected by the battery management system;

[0100] If the battery power is less than the second threshold and the battery temperature is greater than the temperature threshold, the battery starts to replenish power;

[0101] Or, if the battery terminal voltage is less than the voltage threshold and the battery temperature is greater than the temperature threshold, the battery starts to replenish power.

[0102] The reason for the above situation is that the body area controller is under the jurisdiction of not only the power domain controller, but also a variety of other controllers, and the iteration of the software version is prone to occasional power supply anomalies, thereby waking up the entire vehicle. Therefore, when the cumulative triggering time of the network management module wake-up frame or application frame message is greater than the preset time, it means that the vehicle is awakened and the vehicle is not in a high-voltage state. At this time, the power domain controller makes a judgment based on the above judgment conditions to determine whether the battery needs to be recharged.

[0103] There is another situation. If the new energy vehicle is not in a sleep state and is in a high-voltage state, whether the new energy vehicle exits the charging state is determined based on the battery power, charging current and the accumulated time the high voltage is maintained.

[0104] It should be noted that if the vehicle is awakened and is in a high-voltage state, the battery will also be replenished. The maximum replenishment time of the battery is generally set to a second preset time, for example, 2 hours. If the cumulative time of high voltage maintenance is greater than the second preset time, the battery will exit the replenishment. This means that the battery has been charged for 2 hours under the high-voltage state of the vehicle and no longer needs to be replenished. In addition, if the battery power is 100% and the replenishment current is less than the second current threshold within the first preset time, the battery will exit the replenishment; the first preset time can be 100 seconds.

[0105] In addition, in the smart power replenishment state, when the following logical conditions a|b are met, the smart power replenishment state will also be triggered to exit:

[0106] a. If the charging or discharging gun is identified during the charging process and the charging and discharging process is identified, the smart charging mode will be exited and the charging / discharging mode will be switched according to the charging process;

[0107] b. During the power replenishment process, if the door is opened and the power is turned on to trigger the high voltage process, the intelligent power replenishment mode will be exited;

[0108] After the above intervention conditions are triggered, the whole vehicle maintains a high voltage state and keeps the DCDC in a voltage drop mode to continuously provide supply voltage to the battery; after the intervention conditions are revoked, the power domain controller continues to detect the power replenishment request or the above power replenishment exit conditions are not met, the intelligent power replenishment function will be activated again, otherwise the power domain controller will consider that the power replenishment has ended.

[0109] For power feed triggering scenarios

[0110] When the battery power is less than the second threshold and the battery recharge cannot be triggered, or the preset number of recharges in a single first cycle is used up, for example, the maximum number of recharges in a single first cycle is 8 times; then upload to TBOX and send an APP reminder + SMS reminder to the user through cloud processing. If it is still not triggered after waking up from sleep mode, no more reminder will be given.

[0111] This embodiment comprehensively considers three common states of new energy vehicles: sleep scenario, low-voltage wake-up scenario, and high-voltage scenario. When the battery is continuously consumed and needs to be recharged, the power domain controller monitors the gear position, front hood, rear cover status, power battery power, and vehicle mode, and determines whether to wake up the remaining controllers of the vehicle for high-voltage power-up based on the set logic, effectively avoiding the risk of vehicle use caused by battery depletion during vehicle use and reducing complaints about vehicle use.

[0112] In addition, the power replenishment logic of this solution effectively avoids abnormal health conditions caused by battery SOC jumps or the gap between SOC and terminal voltage due to long-term use of the battery, and supplements the condition of continuous monitoring of the battery terminal voltage. Without adding additional hardware costs, it can more reasonably avoid power shortages.

[0113] Based on the original first-cycle wake-up and power replenishment strategy, this solution introduces a second-cycle wake-up strategy, which effectively avoids the scenario where the battery is continuously consumed and low on power due to excessive dark current and can replenish the battery in time to improve efficiency.

[0114] In summary, the embodiment of this specification provides a battery charging control method, which determines whether the new energy vehicle is in a dormant state; if the new energy vehicle is in a dormant state, the power domain controller actively wakes up every first period and determines whether the battery meets the first charging condition; if the battery meets the first charging condition, the battery charging is turned on; if the battery does not meet the first charging condition, when the battery power is less than the first power threshold, the battery management system actively wakes up every second period and sends the detected battery information to the power domain controller to determine whether the battery meets the second charging condition; if the second charging condition is met, the battery charging is turned on. In this way, the abnormal health state caused by the jump of the battery power SOC or the gap between the SOC and the terminal voltage due to the long-term use of the battery is effectively avoided, and the conditions for continuous monitoring of the battery terminal voltage are supplemented, without the need for additional hardware costs, and the occurrence of power shortage is more reasonably avoided.

[0115] Based on the same inventive concept, Figure 2 As shown in the block diagram of the battery charging control device, an embodiment of the present invention provides a battery charging control device, comprising:

[0116] A judgment module is used to judge whether the new energy vehicle is in a dormant state;

[0117] The first processing module is used for, when the new energy vehicle is in a dormant state, the power domain controller actively wakes up at intervals of a first period, and determines whether the battery meets the first charging condition; if the battery meets the first charging condition, the battery charging is started;

[0118] The second processing module is used for, when the battery does not meet the first charging condition, then when the battery power is less than the first power threshold, the battery management system actively wakes up every second period and sends the detected battery information to the power domain controller to determine whether the battery meets the second charging condition; if the second charging condition is met, the battery charging is started.

[0119] In an optional implementation, the first processing module may also be used for:

[0120] Obtain the battery power, battery terminal voltage, battery temperature and battery management system status detected by the battery management system;

[0121] If the battery power is less than the first threshold, the battery temperature is greater than the temperature threshold, and the interval time since the last battery replenishment is greater than the interval threshold, then the battery meets the first charging condition;

[0122] Or, if the battery power is less than the second threshold and the battery temperature is greater than the temperature threshold, the battery meets the first charging condition;

[0123] Or, if the battery terminal voltage is less than the voltage threshold and the battery temperature is greater than the temperature threshold, the battery meets the first charging condition;

[0124] Alternatively, if the battery management system is in a fault state, the battery temperature is greater than a temperature threshold, and the interval time since the battery was last recharged is greater than an interval threshold, the battery meets the first charging condition.

[0125] In an optional embodiment, the second processing module may also be used for:

[0126] Obtaining battery information detected by the battery management system, wherein the battery information includes battery power, battery terminal voltage, static current, battery management system status, and battery temperature;

[0127] If the static current is less than or equal to the first current threshold, then the interval time since the last recharging of the battery is calculated;

[0128] Determining whether the battery meets the second charging condition according to the interval time, battery power, battery terminal voltage, battery temperature, and battery management system status;

[0129] If the static current is greater than the first current threshold, it is determined whether the battery meets the second charging condition based on the battery temperature.

[0130] In an optional embodiment, the second processing module may also be used for:

[0131] If the battery temperature is greater than the temperature threshold and the interval time is greater than the interval threshold, the battery meets the second charging condition;

[0132] Or, if the battery power is less than the second threshold and the battery temperature is greater than the temperature threshold, the battery meets the second charging condition;

[0133] Or, if the battery terminal voltage is less than the voltage threshold and the battery temperature is greater than the temperature threshold, the battery meets the second charging condition;

[0134] Alternatively, if the battery management system is in a fault state, the battery temperature is greater than a temperature threshold, and the interval time is greater than an interval threshold, the battery meets the second charging condition.

[0135] In an optional embodiment, the second processing module may also be used for:

[0136] If the battery temperature is greater than the temperature threshold, the battery meets the second charging condition.

[0137] In an optional implementation, the battery charging control device further includes a third processing module, and the third processing module is further used for:

[0138] If the new energy vehicle is not in a dormant state and is in an awake state, the power domain controller makes a judgment based on the battery power, battery terminal voltage, and battery temperature detected by the battery management system;

[0139] If the battery power is less than the second threshold and the battery temperature is greater than the temperature threshold, the battery starts to replenish power;

[0140] Or, if the battery terminal voltage is less than the voltage threshold and the battery temperature is greater than the temperature threshold, the battery starts to replenish power.

[0141] In an optional implementation, the third processing module is further used for:

[0142] If the new energy vehicle is in a non-dormant state and is in a high-voltage state, whether the new energy vehicle exits the charging state is determined based on the battery power, the charging current, and the accumulated time the high voltage is maintained.

[0143] In an optional implementation, the third processing module is further used for:

[0144] If the battery power is 100% and the charging current is less than the second current threshold within the first preset time, the battery will exit the charging mode;

[0145] Or, if the accumulated time of maintaining the high voltage is greater than the second preset time, the battery will quit charging.

[0146] In an optional implementation manner, the judgment module is further used to:

[0147] Obtain the gear status, front hood and trunk lid status, power battery power, and vehicle software upgrade status of new energy vehicles;

[0148] If the gear position is P, the front hood and trunk lid are closed, the power battery power is greater than 5%, and the vehicle is in a non-software upgrade state, the power domain controller will actively wake up every first cycle.

[0149] In summary, the battery charging control device provided in the embodiment of this specification determines whether the new energy vehicle is in a dormant state; if the new energy vehicle is in a dormant state, the power domain controller actively wakes up every first period and determines whether the battery meets the first charging condition; if the battery meets the first charging condition, the battery charging is turned on; if the battery does not meet the first charging condition, when the battery power is less than the first power threshold, the battery management system actively wakes up every second period and sends the detected battery information to the power domain controller to determine whether the battery meets the second charging condition; if the second charging condition is met, the battery charging is turned on. In this way, the abnormal health state caused by the jump of the battery power SOC or the gap between the SOC and the terminal voltage due to the long-term use of the battery is effectively avoided, and the conditions for continuous monitoring of the battery terminal voltage are supplemented, without the need for additional hardware costs, and the occurrence of power shortage is more reasonably avoided.

[0150] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the battery charging control device described above can refer to the corresponding process in the aforementioned method, and will not be described in detail here.

[0151] Based on the same inventive concept, an embodiment of the present invention provides a new energy vehicle, including a vehicle body and a battery arranged in the vehicle body, and the battery is applicable to the aforementioned battery charging method.

[0152] In summary, the embodiment of this specification provides a new energy vehicle, which determines whether the new energy vehicle is in a dormant state; if the new energy vehicle is in a dormant state, the power domain controller actively wakes up every first period and determines whether the battery meets the first charging condition; if the battery meets the first charging condition, the battery charging is turned on; if the battery does not meet the first charging condition, when the battery power is less than the first power threshold, the battery management system actively wakes up every second period and sends the detected battery information to the power domain controller to determine whether the battery meets the second charging condition; if the second charging condition is met, the battery charging is turned on. In this way, the abnormal health state caused by the jump of the battery power SOC or the gap between the SOC and the terminal voltage due to the long-term use of the battery is effectively avoided, and the conditions for continuous monitoring of the battery terminal voltage are supplemented, without the need for additional hardware costs, and more reasonably avoiding the occurrence of power shortage.

[0153] Technicians in the relevant field can clearly understand that, for the convenience and simplicity of description, the specific working process of the battery charging control method in the new energy vehicle described above can refer to the corresponding process in the aforementioned method, and will not be elaborated here.

[0154] The above are only various embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A battery charging control method, applicable to new energy vehicles, characterized in that: include: Determine whether the new energy vehicle is in a dormant state; If the new energy vehicle is in a dormant state, the power domain controller actively wakes itself up every first period and determines whether the battery meets the first charging condition; If the battery meets the first charging condition, start the battery charging; If the battery does not meet the first charging condition, when the battery power is less than the first power threshold, the battery management system actively wakes up every second period and sends the detected battery information to the power domain controller, and the power domain controller determines whether the battery meets the second charging condition; If the second charging condition is met, the battery charging is started.

2. The method according to claim 1, characterized in that The determining whether the battery meets the first charging condition includes: Obtain the battery power, battery terminal voltage, battery temperature and battery management system status detected by the battery management system; If the battery power is less than a first threshold, the battery temperature is greater than a temperature threshold, and the interval time since the last battery replenishment is greater than an interval threshold, then the battery meets a first charging condition; Or, if the battery power is less than a second threshold and the battery temperature is greater than a temperature threshold, then the battery meets the first charging condition; Or, if the battery terminal voltage is less than a voltage threshold and the battery temperature is greater than a temperature threshold, then the battery meets a first charging condition; Alternatively, if the battery management system is in a fault state, the battery temperature is greater than a temperature threshold, and the interval time since the battery was last recharged is greater than an interval threshold, then the battery meets the first charging condition.

3. The method according to claim 1, characterized in that The determining whether the battery meets the second charging condition includes: Acquire battery information detected by the battery management system, wherein the battery information includes battery power, battery terminal voltage, static current, battery management system status, and battery temperature; If the static current is less than or equal to the first current threshold, then calculating the interval time since the last recharging of the battery; Determining whether the battery meets a second charging condition according to the interval time, the battery power, the battery terminal voltage, the battery temperature, and the state of the battery management system; If the static current is greater than the first current threshold, it is determined whether the battery meets the second charging condition according to the battery temperature.

4. The method according to claim 3, characterized in that Judging whether the battery meets the second charging condition according to the interval time, the battery power, the battery terminal voltage, the battery temperature, and the battery management system state includes: If the battery temperature is greater than the temperature threshold and the interval time is greater than the interval threshold, the battery meets the second charging condition; Or, if the battery power is less than a second threshold and the battery temperature is greater than a temperature threshold, then the battery meets a second charging condition; Or, if the battery terminal voltage is less than a voltage threshold and the battery temperature is greater than a temperature threshold, the battery meets a second charging condition; Alternatively, if the battery management system is in a fault state, the battery temperature is greater than a temperature threshold, and the interval time is greater than an interval threshold, the battery meets the second charging condition.

5. The method according to claim 3, characterized in that: The step of judging whether the battery meets the second charging condition according to the battery temperature includes: If the battery temperature is greater than the temperature threshold, the battery meets the second charging condition.

6. The method according to claim 1, characterized in that The method further comprises: If the new energy vehicle is in a non-dormant state and in an awake state, the power domain controller makes a judgment based on the battery power, battery terminal voltage and battery temperature detected by the battery management system; If the battery power is less than a second threshold and the battery temperature is greater than a temperature threshold, the battery starts to replenish power; Alternatively, if the battery terminal voltage is less than a voltage threshold and the battery temperature is greater than a temperature threshold, the battery starts to replenish power.

7. The method according to any one of claims 1 to 6, characterized in that: If the new energy vehicle is in a non-dormant state and is in a high-voltage state, it is determined whether the new energy vehicle exits the charging state based on the battery power, the charging current and the accumulated time of maintaining the high voltage.

8. The method according to claim 7, characterized in that The step of determining whether the new energy vehicle should exit the charging process according to the battery power, the charging current and the accumulated high voltage maintenance time includes: If the battery power is 100% and the charging current is less than the second current threshold within the first preset time, the battery will exit the charging mode; Alternatively, if the accumulated high voltage maintenance time is greater than a second preset time, the battery exits the charging mode.

9. A battery charging control device, characterized in that: include: A judgment module is used to judge whether the new energy vehicle is in a dormant state; The first processing module is used for, when the new energy vehicle is in a dormant state, the power domain controller actively wakes itself up at intervals of a first period, and determines whether the battery meets a first charging condition; if the battery meets the first charging condition, the battery charging is started; The second processing module is used for, when the battery does not meet the first charging condition, then when the battery power is less than the first power threshold, the battery management system actively wakes up every second period and sends the detected battery information to the power domain controller, and the power domain controller determines whether the battery meets the second charging condition; if the second charging condition is met, the battery charging is started.

10. A new energy vehicle, characterized in that: It includes a vehicle body and a battery arranged in the vehicle body, and the battery is applicable to the battery replenishment control method described in any one of claims 1-8.

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