Method, device, equipment and vehicle for heat recycling when charging battery

Abstract

The application provides a heat recycling method, device, equipment and vehicle during battery charging, when the battery pack is in a charging state, if it is detected that the battery pack temperature is lower than a first target temperature, and the heat recycling device temperature and the engine temperature do not satisfy heating conditions, it is determined whether the engine temperature and / or the heat recycling device temperature is greater than a second target temperature, if it is detected that the engine temperature and / or the heat recycling device temperature is greater than the second target temperature, the engine or the heat recycling device which is greater than the second target temperature is selected as a heat source, the heat source is controlled to heat the battery pack, in order to prevent the battery pack from being damaged by high temperature, the battery pack inlet water temperature is kept from being higher than a fourth target temperature during the heating process, recycling of the recycled heat is realized, and the safety during the battery pack heating process is ensured.

Description

Technical Field

[0001] This invention relates to the field of vehicle control technology, and specifically to a method, apparatus, equipment, and vehicle for recovering and reusing heat during battery charging. Background Technology

[0002] The automotive industry is currently focused on researching ways to reduce vehicle energy consumption in order to adapt to the increasingly severe energy crisis. This includes developing new energy vehicles and adopting new technologies, but these efforts are often costly.

[0003] The reduced driving range of pure electric vehicles in winter has always been a problem for OEMs. The energy for heating the battery and the passenger compartment comes from the battery, making the already limited energy storage even more insufficient. Therefore, how to improve the energy utilization rate of the battery and passenger compartment heating has become a key issue for engineers to tackle, so that the vehicle can have a longer driving range with the same amount of electricity and be more competitive.

[0004] Efficient battery heating, waste heat utilization of motors and engines, and the application of heat pump technology—these energy-saving technologies, along with technologies that enhance customer experience, all play a positive role in reducing the overall energy consumption of a vehicle.

[0005] For existing hybrid vehicles, the engine's waste heat is only used to heat the passenger compartment when the engine is running. A few technologies use the engine to heat the battery. However, after the engine stops, the engine's waste heat is also wasted. How to make full use of this wasted heat to improve vehicle performance is one of the topics that those skilled in the art are constantly researching. Summary of the Invention

[0006] In view of this, embodiments of the present invention provide a method, apparatus, equipment, and vehicle for recovering and reusing heat during battery charging, so as to ensure the safety of the battery pack charging process while making full use of the vehicle's heat recovery.

[0007] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0008] A method for recovering and reusing heat during battery charging includes:

[0009] When the battery pack is charging, determine whether the battery pack temperature is lower than the first target temperature;

[0010] When the battery pack temperature is lower than the first target temperature, determine whether the temperature of the heat recovery device and the engine temperature meet the battery pack heating conditions.

[0011] When neither the temperature of the heat recovery device nor the engine temperature meets the heating conditions, determine whether the engine temperature and / or the temperature of the heat recovery device are greater than the second target temperature.

[0012] When the engine temperature and / or the heat recovery device temperature are greater than the second target temperature, the engine or heat recovery device with a temperature greater than the second target temperature is selected as the heat source, and the heat source is controlled to heat the battery pack, while keeping the inlet water temperature of the battery pack below the fourth target temperature during the heating process.

[0013] Optionally, in the above-mentioned method for recovering and reusing heat during battery charging, determining whether the temperatures of the heat recovery device and the engine meet the battery pack heating conditions includes:

[0014] Determine whether the temperature of the heat recovery device is within a preset temperature range and whether the difference between the temperature of the heat recovery device and the temperature of the battery pack is greater than a preset temperature difference; the lower limit of the preset temperature range is the second target temperature, the upper limit of the preset temperature range is the third target temperature, the second target temperature is greater than the battery pack temperature, and the difference between the two is not less than the first target temperature;

[0015] Determine whether the engine temperature is within a preset temperature range and whether the difference between the engine temperature and the battery pack temperature is greater than a preset temperature difference;

[0016] If the temperature of the heat recovery device is within the preset temperature range, and the difference between the temperature of the heat recovery device and the temperature of the battery pack is greater than the preset temperature difference, it indicates that the temperature of the heat recovery device meets the battery pack heating conditions.

[0017] If the engine temperature is within the preset temperature range, and the difference between the engine temperature and the battery pack temperature is greater than the preset temperature difference, it indicates that the engine temperature meets the battery pack heating conditions.

[0018] Optionally, in the above-mentioned method for recovering and reusing heat during battery charging, when both the temperature of the heat recovery device and the engine temperature meet the heating conditions, the higher priority of the heat recovery device and the engine is controlled to heat the battery pack; when either the temperature of the heat recovery device or the engine temperature meets the heating conditions, the one that meets the heating conditions is controlled to heat the battery pack.

[0019] Optionally, in the above-described method for recovering and reusing heat during battery charging, after heating the battery pack, the method further includes:

[0020] The temperature of the battery pack is obtained based on a preset sampling frequency;

[0021] Determine whether the battery pack temperature has reached the first target temperature;

[0022] When the first target temperature is reached, heating of the battery pack is stopped.

[0023] Optionally, in the above-described method for recovering and reusing heat during battery charging, after stopping heating of the battery pack, the method further includes:

[0024] Determine whether the engine temperature is greater than the temperature of the heat recovery device;

[0025] When the engine temperature is higher than the heat recovery device temperature, the engine circuit is controlled to heat the heat recovery device.

[0026] Optionally, in the above-mentioned method for recovering and reusing heat during battery charging, after the engine circuit has finished heating the heat recovery device, the engine circuit is then controlled to heat the battery pack, including:

[0027] The engine circuit is controlled to heat the heat recovery device;

[0028] The temperature of the heat recovery device is obtained based on a preset sampling frequency;

[0029] Determine whether the temperature of the heat recovery device is in a stable state;

[0030] When the temperature of the heat recovery device is stable, the heating of the heat recovery device by the engine circuit is stopped.

[0031] The engine circuit is controlled to heat the battery pack.

[0032] Optionally, in the above-mentioned method for recovering and reusing heat during battery charging, controlling the engine circuit to heat the battery pack includes:

[0033] The solenoid valve in the heating circuit between the engine circuit and the battery pack is opened to the initial angle.

[0034] Controls the operation of the engine water pump and battery pack water pump;

[0035] Obtain the inlet water temperature of the battery pack;

[0036] Using the fourth target temperature as a reference, the battery pack inlet water temperature and the fourth target temperature are used as input parameters for PID calculation to obtain the PID output result;

[0037] The opening angle of the solenoid valve is adjusted based on the PID output.

[0038] A device for recovering and reusing heat during battery charging includes:

[0039] The battery heating demand determination unit is used to determine whether the battery pack temperature is lower than the first target temperature when the battery pack is in a charging state.

[0040] The heat source selection unit is used to determine whether the temperature of the heat recovery device and the engine temperature meet the heating conditions of the battery pack when the battery pack temperature is lower than the first target temperature; when neither the temperature of the heat recovery device nor the engine temperature meets the heating conditions, it determines whether the engine temperature is higher than the second target temperature; when the engine temperature is higher than the second target temperature, it determines whether the engine temperature is higher than the temperature of the heat recovery device; when the engine temperature is higher than the temperature of the heat recovery device, it controls the engine circuit to heat the heat recovery device after completing the heating, and then controls the engine circuit to heat the battery pack.

[0041] A device for recovering and reusing heat during battery charging includes a memory and a processor;

[0042] The memory is used to store programs;

[0043] The processor is used to execute the program to implement each step of the heat recovery and reuse method during battery charging as described in any of the above claims.

[0044] A vehicle characterized by including the aforementioned heat recovery and reuse equipment during battery charging.

[0045] Based on the above technical solution, the solution provided in this embodiment of the invention monitors the temperature of the battery pack when it is in a charging state. When the battery pack temperature is detected to be lower than the first target temperature, and both the temperature of the heat recovery device and the engine temperature do not meet the heating conditions, it is determined whether the engine temperature and / or the temperature of the heat recovery device is higher than the second target temperature. When the engine temperature and / or the temperature of the heat recovery device is detected to be higher than the second target temperature, the engine or the heat recovery device with a temperature higher than the second target temperature is selected as the heat source, and the heat source is controlled to heat the battery pack. To prevent the battery pack from being damaged by high temperature, the battery pack inlet water temperature is used as a fourth target temperature as a reference during the heating process. The battery pack inlet water temperature is kept below the fourth target temperature during the heating process, so that the battery pack inlet water temperature fluctuates around the fourth target temperature. While reusing the recovered heat, the safety of the battery pack heating process is ensured. Compared with the heat recovery and reuse strategies in the prior art, the strategy disclosed in this application makes fuller use of the vehicle's heat and the battery heating process is safer. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0047] Figure 1 A schematic flowchart illustrating the heat recovery and reuse method during battery charging disclosed in this application embodiment;

[0048] Figure 2 A schematic flowchart of a method for recovering and reusing heat during battery charging, disclosed in another embodiment of this application;

[0049] Figure 3 A schematic flowchart of a method for recovering and reusing heat during battery charging, disclosed in another embodiment of this application;

[0050] Figure 4 A schematic flowchart of a method for recovering and reusing heat during battery charging, disclosed in another embodiment of this application;

[0051] Figure 5 This is a schematic diagram of the structure of the heat recovery and reuse device during battery charging disclosed in an embodiment of this application.

[0052] Figure 6 This is a schematic diagram of the structure of the heat recovery and reuse device during battery charging disclosed in an embodiment of this application. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] In this solution, in order to improve the utilization rate of recovered heat and enhance vehicle performance, this application discloses an energy recovery and reuse scheme during battery charging. In this scheme, if the battery pack temperature is detected to be low during the charging process, the battery pack is heated by a heat collection tank or preheating of the engine to enable the battery pack to reach the optimal charging temperature and ensure the safety of the battery pack charging process.

[0055] Specifically, this application discloses a method for recovering and reusing heat during battery charging, see [link to relevant documentation]. Figure 1 This includes steps S101-S105.

[0056] Step S101: When the battery pack is charging, determine whether the battery pack temperature is higher than the first target temperature.

[0057] In this step, the charging and discharging status of the battery pack is detected. When the vehicle is detected plugged in for charging, the temperature of the battery pack is acquired. The reason for acquiring the battery pack temperature is to determine whether the battery pack temperature is within the efficient charging temperature range. During charging, the battery pack temperature varies, and there is an efficient charging temperature range. When the battery pack is within this temperature range, it will have high charging efficiency, while outside this temperature range, the charging efficiency will be very low. Therefore, when the battery pack is charging, it is necessary to acquire the battery pack temperature and determine whether the battery pack temperature is within the efficient charging temperature range. To determine whether the battery pack temperature is within the efficient charging temperature range, it can be determined by whether the battery pack temperature is higher than a first heating temperature. When the battery pack temperature is higher than the first target temperature, it indicates that the battery pack temperature is already within the efficient charging temperature range, and the battery pack has high charging efficiency, so there is no need to heat the battery pack further. If the battery pack temperature is lower than the first target temperature, it indicates that the battery pack charging efficiency is low, and the battery pack needs to be heated. The value of the first target temperature can be set according to the battery type and battery specifications. For example, in this solution, the first target temperature can be 5℃, 10℃ or 15℃. The collected battery pack temperature is compared with the first heating temperature. When it is determined that the battery pack temperature is lower than the first heating temperature, it indicates that the battery pack is in a low temperature state and has an urgent need for heating. The battery pack needs to be heated.

[0058] Step S102: When the battery pack temperature is lower than the first target temperature, determine whether the temperature of the heat recovery device and the engine temperature meet the battery pack heating conditions.

[0059] The heat recovery device is used to recover and store excess heat from the vehicle during driving. This heat is stored in a medium within the heat recovery device. The more heat the heat recovery device recovers, the higher its temperature. In this solution, the heat recovery device can specifically be a heat collection tank, and the heat it recovers includes at least the heat from the high-temperature exhaust gas generated when the engine is running.

[0060] When a vehicle is plugged in for charging, it is generally in a stopped state, and the engine is also off. If the engine has just been turned off before the charging is plugged in, a large amount of heat will remain on the engine. The more heat remains, the higher the engine temperature will be. This heat can also heat the battery pack. In the technical solution disclosed in this embodiment, the temperature of the heat recovery device and the engine temperature can refer to the temperature of the heat recovery device body and the engine body, or it can refer to the temperature of the medium inside the heat recovery device and the temperature of the engine circuit.

[0061] In this solution, when the battery pack temperature is detected to be lower than the first target temperature, it is necessary to determine whether the temperatures of the heat recovery device and the engine meet the preset battery pack heating conditions. Only when the temperatures of the heat recovery device or the engine meet the preset battery pack heating conditions can the corresponding heat source be used to heat the battery pack. The heat source refers to the heat recovery device and the engine. The preset battery pack heating conditions may include: the temperature of the heat source is within a preset temperature range, and the difference between the temperature of the heat source and the battery pack temperature is greater than a preset temperature difference. The preset temperature range is a continuous temperature range consisting of a second target temperature and a third target temperature. The second target temperature is greater than the battery pack temperature, and the difference between the two is not less than the first target temperature. The battery pack temperature may refer to the lowest temperature of the cells in the battery pack. The specified point temperature is the temperature at which the high-temperature medium output by the heat source can damage the battery pack. If the heat source temperature is higher than this temperature, heating the battery pack with the heat source will easily damage it due to the excessively high medium temperature. Therefore, when the heat source temperature is higher than this third target temperature, the heat source cannot directly heat the battery pack. The value of the third target temperature is related to the battery pack's tolerance temperature and the heat automatically dissipated by the high-temperature medium during transmission. Its value is pre-calibrated; for example, in this solution, the value of the third target temperature can be 50℃, 55℃, 60℃, or others. The preset temperature difference refers to the temperature difference at which the heat source can effectively heat the battery pack. When the temperature difference between the heat source temperature and the battery pack temperature is greater than the preset temperature difference, the heat source can effectively raise the battery pack to above the first target temperature. When the temperature difference between the heat source temperature and the battery pack temperature is lower than the preset temperature difference, it indicates that the heat source cannot raise the battery pack temperature to above the first target temperature. In this case, the heat source cannot be used to heat the battery pack, and it should be checked whether other heat sources can be used to heat the battery pack. In this solution, the value of the preset temperature difference can be set by the user according to their needs. For example, in this solution, the preset temperature difference can be 5°C or other values.

[0062] In this scheme, only when both of the above conditions are met simultaneously is it considered that the heat source temperature meets the battery pack heating conditions, and the heat source can be used to heat the battery pack. Specifically, determining whether the heat recovery device temperature meets the battery pack heating conditions may include: determining whether the heat recovery device temperature is within a preset temperature range and whether the difference between the heat recovery device temperature and the battery pack temperature is greater than a preset temperature difference. If the heat recovery device temperature is within the preset temperature range and the difference between the heat recovery device temperature and the battery pack temperature is greater than the preset temperature difference, it indicates that the heat recovery device temperature meets the battery pack heating conditions. Similarly, determining whether the engine temperature meets the battery pack heating conditions may include: determining whether the engine temperature is within a preset temperature range and whether the difference between the engine temperature and the battery pack temperature is greater than a preset temperature difference. If the engine temperature is within the preset temperature range and the difference between the engine temperature and the battery pack temperature is greater than the preset temperature difference, it indicates that the engine temperature meets the battery pack heating conditions.

[0063] When both the temperature of the heat recovery device and the engine temperature meet the heating conditions, the higher priority of the heat recovery device and the engine can be controlled to heat the battery pack. When either the temperature of the heat recovery device or the engine temperature meets the heating conditions, the one that meets the heating conditions can be controlled to heat the battery pack.

[0064] In this solution, when both the temperature of the heat recovery device and the engine temperature meet the heating conditions, either the engine or the heat recovery device can be selected as the heat source based on a preset priority. This preset priority refers to the priority of the engine or the heat recovery device, which is pre-configured. In this solution, the engine's priority can be set higher than the heat recovery device's priority. This is because when the vehicle is plugged in for charging, the engine is normally off, and the heat dissipates quickly from the engine, while the heat in the heat recovery device dissipates slowly and can be retained for a longer period. Therefore, when both the engine and the heat recovery device can be used as heat sources, the engine is preferentially selected. Alternatively, the priority of the heat recovery device can also be set higher than that of the engine.

[0065] When neither the temperature of the heat recovery device nor the engine temperature meets the battery pack heating conditions, step S103 is executed.

[0066] Step S103: Determine whether the engine temperature and / or the heat recovery device temperature are greater than the second target temperature;

[0067] When neither the temperature of the heat recovery device nor the engine temperature meets the battery pack heating conditions, it is determined whether the engine temperature and / or the temperature of the heat recovery device are greater than the second target temperature. If either of them is greater than the second target temperature, the flow rate of the high-temperature medium can be controlled during the heating process of the battery pack to prevent damage to the battery pack from the high-temperature medium. When the engine temperature and / or the temperature of the heat recovery device are greater than the second target temperature, step S104 is executed.

[0068] When both the engine temperature and the heat recovery device temperature are lower than the second target temperature, the battery pack can be heated using PTC or other heating methods.

[0069] Step S104: Select the engine or heat recovery device with a temperature greater than the second target temperature as the heat source;

[0070] In this step, when it is determined that the engine temperature and / or the heat recovery device temperature are greater than the second target temperature, the heat source is determined based on the judgment result. If the engine temperature is greater than the second target temperature, the engine is selected as the heat source. If the heat recovery device temperature is greater than the second target temperature, the heat recovery device is selected as the heat source. Of course, when both temperatures are greater than the second target temperature, the engine or the heat recovery device can be selected as the heat source based on a preset priority.

[0071] Step S105: Control the heat source to heat the battery pack, and keep the inlet water temperature of the battery pack below the fourth target temperature during the heating process.

[0072] In this step, the temperature of the heat source will be higher than the second target temperature. In order to prevent the battery pack from being damaged due to excessively high medium temperature, in this solution, the inlet water temperature of the battery pack needs to be monitored in real time during the heating process. The heating process is controlled based on the inlet water temperature of the battery pack so that the inlet water temperature of the battery pack does not exceed the fourth target temperature, thereby preventing the battery pack from being damaged due to excessive temperature.

[0073] Specifically, the heating process can be regulated by a closed-loop control (PID control) method to adjust the flow rate of the high-temperature medium entering the battery pack. The input data for the PID control process are the battery pack inlet water temperature and a fourth target temperature. The output data of the PID control is used to adjust the flow rate of the medium entering the battery pack. The fourth target temperature is used as a reference temperature, representing the battery pack's tolerable temperature. Its value varies depending on the battery pack's specifications and type. When the battery pack inlet water temperature exceeds this temperature, it can easily damage the battery pack. The fourth target temperature matches the battery pack's tolerable temperature; the higher the tolerable temperature, the better. For example, in this embodiment, the fourth target temperature can be set to 45°C, 40°C, or 50°C. By regulating the flow rate of the high-temperature medium entering the battery pack from the heat source using PID control, the battery pack inlet water temperature is maintained at the fourth target temperature, thus ensuring that the battery pack is not damaged by high temperatures.

[0074] As can be seen from the above scheme, the heat recovery and reuse method for battery charging disclosed in this application monitors the temperature of the battery pack when the battery pack is in a charging state. When the battery pack temperature is detected to be lower than the first target temperature, and the temperatures of the heat recovery device and the engine do not meet the heating conditions, it is determined whether the engine temperature and / or the heat recovery device temperature is higher than the second target temperature. When the engine temperature and / or the heat recovery device temperature is detected to be higher than the second target temperature, the engine or heat recovery device with a temperature higher than the second target temperature is selected as the heat source, and the heat source is controlled to heat the battery pack. In order to prevent the battery pack from being damaged by high temperature, the battery pack inlet water temperature is used as a reference to maintain the battery pack inlet water temperature not exceeding the fourth target temperature during the heating process, so that the battery pack inlet water temperature fluctuates around the fourth target temperature. While reusing the recovered heat, the safety of the battery pack heating process is ensured.

[0075] In this embodiment, if the temperature of the heat recovery device meets the heating conditions of the battery pack, when the heat recovery device is used to heat the battery pack, the heating process may include: controlling the solenoid valve in the first heat exchange circuit between the heat recovery device and the battery pack to open, which may be fully open, and simultaneously controlling the water pump of the heat recovery device or the water pump of the battery pack to work, so that the high-temperature medium in the heat recovery device flows to the battery pack, exchanges heat with the battery pack through a heat exchanger at the battery pack, and then flows back to the heat recovery device through the first heat exchange circuit.

[0076] In this embodiment, if the engine temperature meets the battery pack heating conditions, when the engine is used to heat the battery pack, the heating process may include: controlling the solenoid valve in the second heat exchange circuit between the engine circuit and the battery pack to open, which may be fully open, and simultaneously controlling the engine water pump or the battery pack water pump to work, so that the high-temperature medium in the engine circuit flows to the battery pack, exchanges heat with the battery pack through a heat exchanger at the battery pack, and then flows back to the engine circuit through the second heat exchange circuit.

[0077] In the technical solution disclosed in this embodiment, after the battery pack is heated, the temperature of the battery pack can be detected in real time. When the temperature of the battery pack reaches the first target temperature, heating of the battery pack is stopped. For details, see [link to documentation]. Figure 2 The above method further includes, after heating the battery pack:

[0078] Step S201: Obtain the temperature of the battery pack based on a preset sampling frequency.

[0079] In this step, when the battery pack is heated, the battery pack temperature can be obtained based on a preset frequency. The preset sampling frequency can be set by the user according to their needs, for example, once every 30 seconds, once per minute, etc.

[0080] Step S202: Determine whether the battery pack temperature has reached the first target temperature.

[0081] The collected battery pack temperature is compared with the first target temperature. When the battery pack temperature reaches or exceeds the first target temperature, it indicates that the battery pack has entered the high-efficiency charging temperature range. At this time, during the charging process, the self-released heat of the battery pack can keep the battery pack stable within the high-efficiency charging temperature range, so there is no need to heat the battery pack. Then, step S203 is executed.

[0082] Step S203: When the first target temperature is reached, stop heating the battery pack.

[0083] Stop heating the battery pack by closing the solenoid valve in the heat exchange circuit between the battery pack and the heat source, and by controlling the battery pack water pump and the heat source water pump to shut down.

[0084] In the technical solution disclosed in this embodiment, if the heat source is a heat recovery device or an engine when heating the battery pack, and the engine can still effectively heat the heat recovery device after the battery pack heating is stopped, then the solenoid valve in the third heat exchange circuit between the heat recovery device and the engine circuit can be opened. The water pump of the heat recovery device and the water pump of the engine operate at a constant speed, so that the low-temperature medium in the heat recovery device flows to the engine circuit, exchanges heat with the high-temperature medium in the engine circuit, and then flows back to the heat recovery device. Of course, this process can also be that the high-temperature medium in the engine circuit flows to the heat recovery device, and after the heat exchange is completed, it flows back to the engine circuit. Of course, this process can also refer to the overall replacement of the high-temperature medium in the engine circuit and the low-temperature medium in the heat recovery device, that is, the high-temperature medium in the engine circuit flows into the heat recovery device, and the low-temperature medium in the heat recovery device flows into the engine circuit.

[0085] Therefore, see Figure 3 In the above scheme, after stopping the heating of the battery pack, it may further include:

[0086] Step S301: Determine whether the engine temperature is greater than the temperature of the heat recovery device.

[0087] The main purpose of this step is to determine whether the engine can effectively heat the heat recovery device. In this solution, it can be considered that the engine can effectively heat the heat recovery device when the engine temperature is greater than the temperature of the heat recovery device. Of course, in order to ensure that the temperature of the heat recovery device will increase significantly after heating, in this solution, step S302 can be executed only if the engine temperature is greater than the temperature of the heat recovery device and the difference between the two is greater than the fifth target temperature. The value of the fifth target temperature can be set by the user according to their needs. For example, in this embodiment, the value of the fifth target temperature can be 5°C, 10°C or other values.

[0088] Step S302: When the engine temperature is greater than the heat recovery device temperature, control the engine circuit to heat the heat recovery device.

[0089] At this time, when the engine circuit is controlled to heat the heat recovery device, the solenoid valve in the third heat exchange circuit between the heat recovery device and the engine circuit is first opened, and then the water pump of the heat recovery device and the water pump of the engine are controlled to work at a constant speed, so that a flow circuit is formed between the engine circuit and the heat recovery device, and the heat recovery device can be heated through the engine circuit.

[0090] In the above scheme, when using the engine circuit to heat the heat recovery device, the need to continue using the engine circuit to heat the heat recovery device can be determined by judging whether the temperature of the heat recovery device is stable. When using the engine circuit to heat the heat recovery device, the temperature of the heat recovery device can be detected based on another preset frequency to determine whether the temperature of the heat recovery device has increased to the sixth target temperature within a preset time period. If the temperature increase is greater than the sixth target temperature, it is considered that the engine can continue to heat the heat recovery device; otherwise, it is considered that the engine can no longer continue to heat the heat recovery device, and at this time, the engine can be stopped to heat the heat recovery device. The preset time period can refer to the time period before the current time node with the current time as the end time. The value of the sixth target temperature can be 1℃, 2℃, 3℃, or others.

[0091] In the technical solutions disclosed in the above embodiments of this application, when selecting the engine or heat recovery device with a temperature greater than the second target temperature as the heat source and controlling the heat source to heat the battery pack, if the selected heat source is the engine, the engine can be used to heat the heat recovery device first, so that the engine temperature is further reduced. After the engine circuit has completed heating the heat recovery device, the battery pack is then heated. See [link to relevant documentation]. Figure 4 This process may specifically include:

[0092] Step S401: Control the engine circuit to heat the heat recovery device.

[0093] During this process, the solenoid valve in the third heat exchange circuit is opened, and the water pump of the heat recovery device and the engine water pump operate at a constant speed.

[0094] Step S402: Obtain the temperature of the heat recovery device based on a preset acquisition frequency.

[0095] During this process, the temperature of the heat recovery device can be obtained through sensors or through the vehicle system.

[0096] Step S403: Determine whether the temperature of the heat recovery device is in a stable state.

[0097] This step can be specifically to determine whether the temperature rise of the heat recovery device within 5 minutes is less than 1°C. If it is less than 1°C, the temperature of the heat recovery device is considered to be in a stable state; otherwise, continue with this step.

[0098] Step S404: When the temperature of the heat recovery device is stable, stop the engine circuit from heating the heat recovery device.

[0099] At this time, the solenoid valve in the third heat exchange circuit is closed, and the water pump of the heat recovery device and the engine water pump stop working.

[0100] Step S405: Control the engine circuit to heat the battery pack.

[0101] The solenoid valve in the second heat exchange circuit opens to its initial angle, simultaneously controlling the engine water pump or battery pack water pump to operate, allowing the high-temperature medium in the engine circuit to flow to the battery pack. Then, the inlet water temperature of the battery pack is acquired, and the inlet water temperature of the battery pack and the fourth target temperature are used as input parameters for PID calculation to obtain the PID output result. Based on the PID output result, the opening angle of the solenoid valve in the second heat exchange circuit is dynamically adjusted, thereby realizing PID regulation of the flow rate of the high-temperature medium entering the battery pack, ensuring that the battery pack is not damaged due to excessive temperature.

[0102] In the technical solutions disclosed in the above embodiments of this application, when the engine or heat recovery device with a temperature greater than the second target temperature is selected as the heat source and the heat source is controlled to heat the battery pack, if the selected heat source is the heat recovery device, the heat recovery device can be directly controlled to heat the battery pack, and during the heating process, the flow rate of the high-temperature medium entering the battery pack is PID-regulated based on the battery pack inlet water temperature as the fourth target temperature.

[0103] Corresponding to the above method, this embodiment also discloses a heat recovery and reuse device during battery charging. For the specific working content of each unit in the device, please refer to the content of the above method embodiment.

[0104] The following describes the heat recovery and reuse device for battery charging provided in the embodiments of the present invention. The heat recovery and reuse device for battery charging described below can be referred to in correspondence with the heat recovery and reuse method for battery charging described above.

[0105] See Figure 5 The device may include:

[0106] The charging status detection unit 10 is used to detect that the battery pack is in a charging state, which can refer to the charging state of the battery pack when the vehicle is plugged in for charging.

[0107] The first judgment unit 20, corresponding to step S101 in the above method, is used to determine whether the battery pack temperature is lower than the first target temperature.

[0108] The second judgment unit 30, corresponding to step S102 in the above method, is used to determine whether the temperature of the heat recovery device and the engine temperature meet the battery pack heating conditions when the battery pack temperature is lower than the first target temperature.

[0109] The third judgment unit 40, corresponding to step S103 in the above method, is used to determine whether the engine temperature and / or the heat recovery device temperature is greater than the second target temperature when the temperature of the heat recovery device and the engine temperature do not meet the heating conditions.

[0110] The heating control unit 50, corresponding to steps S104 and S105 in the above method, is used to select the engine or the heat recovery device with a temperature greater than the second target temperature as the heat source when the engine temperature and / or the heat recovery device temperature is greater than the second target temperature, control the heat source to heat the battery pack, and perform PID regulation on the flow rate of the high-temperature medium entering the battery pack based on the battery pack inlet water temperature as the fourth target temperature during the heating process.

[0111] Corresponding to the above method, this application also discloses a device for recovering and reusing heat during battery charging. Figure 6 This is a hardware structure diagram of a battery charging heat recovery and reuse device provided in an embodiment of the present invention. It can be loaded into the vehicle's computer. (See attached diagram.) Figure 6 As shown, the device may include: at least one processor 100, at least one communication interface 200, at least one memory 300 and at least one communication bus 400;

[0112] In this embodiment of the invention, the number of processor 100, communication interface 200, memory 300, and communication bus 400 is at least one, and the processor 100, communication interface 200, and memory 300 communicate with each other through communication bus 400; obviously, Figure 6 The communication connections shown for the processor 100, communication interface 200, memory 300, and communication bus 400 are optional.

[0113] Optionally, the communication interface 200 can be an interface of a communication module, such as the interface of a GSM module;

[0114] Processor 100 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

[0115] The memory 300 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0116] Specifically, the processor 100 is used to execute various steps of the heat recovery and reuse method during battery charging disclosed in any of the above embodiments of this application. For example, the processor is used to:

[0117] When the battery pack is charging, determine whether the battery pack temperature is lower than the first target temperature;

[0118] When the battery pack temperature is lower than the first target temperature, determine whether the temperature of the heat recovery device and the engine temperature meet the battery pack heating conditions.

[0119] When neither the temperature of the heat recovery device nor the engine temperature meets the heating conditions, determine whether the engine temperature and / or the temperature of the heat recovery device are greater than the second target temperature.

[0120] When the engine temperature and / or the heat recovery device temperature are greater than the second target temperature, the engine or heat recovery device with a temperature greater than the second target temperature is selected as the heat source, and the heat source is controlled to heat the battery pack. During the heating process, the flow rate of the high-temperature medium entering the battery pack is PID-regulated with the battery pack inlet water temperature as the fourth target temperature as the reference.

[0121] Corresponding to the above-mentioned device, this application also discloses a vehicle that can be equipped with the above-mentioned battery charging heat recovery and reuse device, and the vehicle can be a hybrid electric vehicle.

[0122] For ease of description, the above system is described by dividing it into various modules based on their functions. Of course, in implementing this invention, the functions of each module can be implemented in one or more software and / or hardware components.

[0123] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0124] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0125] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0126] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0127] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for recovering and reusing heat during battery charging, characterized in that, include: When the battery pack is charging, determine whether the battery pack temperature is lower than the first target temperature; When the battery pack temperature is lower than the first target temperature, determine whether the temperature of the heat recovery device and the engine temperature meet the battery pack heating conditions. When both the temperature of the heat recovery device and the engine temperature meet the heating conditions, the engine is preferentially selected as the heat source. When neither the temperature of the heat recovery device nor the engine temperature meets the heating conditions, determine whether the engine temperature and / or the temperature of the heat recovery device are greater than the second target temperature. When the engine temperature and / or the heat recovery device temperature are greater than the second target temperature, the engine or the heat recovery device with a temperature greater than the second target temperature is selected as the heat source. The heat source is controlled to heat the battery pack, and the inlet water temperature of the battery pack is kept below the fourth target temperature during the heating process; Determining whether the temperatures of the heat recovery device and the engine meet the battery pack heating requirements includes: Determine whether the temperature of the heat recovery device is within a preset temperature range and whether the difference between the temperature of the heat recovery device and the temperature of the battery pack is greater than a preset temperature difference; the lower limit temperature of the preset temperature range is the second target temperature, the upper limit temperature of the preset temperature range is the third target temperature, the second target temperature is greater than the battery pack temperature, and the difference between the two is not less than the first target temperature; Determine whether the engine temperature is within a preset temperature range and whether the difference between the engine temperature and the battery pack temperature is greater than a preset temperature difference; If the temperature of the heat recovery device is within the preset temperature range, and the difference between the temperature of the heat recovery device and the temperature of the battery pack is greater than the preset temperature difference, it indicates that the temperature of the heat recovery device meets the battery pack heating conditions. If the engine temperature is within the preset temperature range, and the difference between the engine temperature and the battery pack temperature is greater than the preset temperature difference, it indicates that the engine temperature meets the battery pack heating conditions.

2. The method for recovering and reusing heat during battery charging according to claim 1, characterized in that, When both the temperature of the heat recovery device and the engine temperature meet the heating conditions, the higher priority of the heat recovery device and the engine is controlled to heat the battery pack. When either the temperature of the heat recovery device or the engine temperature meets the heating conditions, the one that meets the heating conditions is controlled to heat the battery pack.

3. The method for recovering and reusing heat during battery charging according to any one of claims 1-2, characterized in that, After the battery pack is heated, the following steps are also included: The temperature of the battery pack is obtained based on a preset sampling frequency; Determine whether the battery pack temperature has reached the first target temperature; When the first target temperature is reached, heating of the battery pack is stopped.

4. The method for recovering and reusing heat during battery charging according to claim 3, characterized in that, After stopping the heating of the battery pack, the process further includes: Determine whether the engine temperature is greater than the temperature of the heat recovery device; When the engine temperature is higher than the heat recovery device temperature, the engine circuit is controlled to heat the heat recovery device.

5. The method for recovering and reusing heat during battery charging according to claim 1, characterized in that, After the engine circuit has finished heating the heat recovery device, the engine circuit is then controlled to heat the battery pack, including: The engine circuit is controlled to heat the heat recovery device; The temperature of the heat recovery device is obtained based on a preset sampling frequency; Determine whether the temperature of the heat recovery device is in a stable state; When the temperature of the heat recovery device is stable, the heating of the heat recovery device by the engine circuit is stopped. The engine circuit is controlled to heat the battery pack.

6. The method for recovering and reusing heat during battery charging according to claim 5, characterized in that, Controlling the engine circuit to heat the battery pack includes: The solenoid valve in the heating circuit between the engine circuit and the battery pack is opened to the initial angle. Controls the operation of the engine water pump and battery pack water pump; Obtain the inlet water temperature of the battery pack; Using the fourth target temperature as a reference, the battery pack inlet water temperature and the fourth target temperature are used as input parameters for PID calculation to obtain the PID output result; The opening angle of the solenoid valve is adjusted based on the PID output.

7. A device for recovering and reusing heat during battery charging, characterized in that, include: The battery heating demand determination unit is used to determine whether the battery pack temperature is lower than the first target temperature when the battery pack is in a charging state. The heat source selection unit is used to determine whether the temperatures of the heat recovery device and the engine meet the heating conditions of the battery pack when the battery pack temperature is lower than the first target temperature; when neither the temperature of the heat recovery device nor the engine temperature meets the heating conditions, it determines whether the engine temperature is higher than the second target temperature; when the engine temperature is higher than the second target temperature, it determines whether the engine temperature is higher than the temperature of the heat recovery device; when the engine temperature is higher than the temperature of the heat recovery device, it controls the engine circuit to heat the heat recovery device after completing the heating, and then controls the engine circuit to heat the battery pack. Determining whether the temperatures of the heat recovery device and the engine meet the battery pack heating requirements includes: Determine whether the temperature of the heat recovery device is within a preset temperature range and whether the difference between the temperature of the heat recovery device and the temperature of the battery pack is greater than a preset temperature difference; the lower limit temperature of the preset temperature range is the second target temperature, the upper limit temperature of the preset temperature range is the third target temperature, the second target temperature is greater than the battery pack temperature, and the difference between the two is not less than the first target temperature; Determine whether the engine temperature is within a preset temperature range and whether the difference between the engine temperature and the battery pack temperature is greater than a preset temperature difference; If the temperature of the heat recovery device is within the preset temperature range, and the difference between the temperature of the heat recovery device and the temperature of the battery pack is greater than the preset temperature difference, it indicates that the temperature of the heat recovery device meets the battery pack heating conditions. If the engine temperature is within the preset temperature range, and the difference between the engine temperature and the battery pack temperature is greater than the preset temperature difference, it indicates that the engine temperature meets the battery pack heating conditions.

8. A device for recovering and reusing heat during battery charging, characterized in that, Including memory and processor; The memory is used to store programs; The processor is configured to execute the program to implement the various steps of the method for recovering and reusing heat during battery charging as described in any one of claims 1-6.

9. A vehicle, characterized in that, Includes the heat recovery and reuse device during battery charging as described in claim 8.

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