A heating system for a vehicle battery and a control method thereof

Abstract

The present invention provides a vehicle-mounted battery heating system and a control method thereof, comprising: a battery module, a heating device, two temperature sensors, a controller and a DC power supply; a first temperature sensor is used to collect the battery temperature of the battery module; a second temperature sensor is used to collect the ambient temperature; the controller is used to query the first target heating power corresponding to the ambient temperature when the charging state signal is charging and the battery temperature is less than the first preset temperature threshold; control the DC power supply to output the charging voltage and the supply voltage corresponding to the first target heating power; when the charging state signal is not charging and the battery temperature is less than the third preset temperature threshold, query the second target heating power corresponding to the ambient temperature and calculate the heating power of the battery, calculate the first actual power required when the battery module is heated to the second preset temperature threshold; control the DC power supply to output the supply voltage of the first actual power. This technology can avoid excessive heating frequency of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of battery thermal management, and in particular to a heating system for a vehicle-mounted battery and a control method thereof. Background Art

[0002] The temperature in the equatorial regions is relatively high throughout the year, which is suitable for the use of lithium iron phosphate batteries. However, the closer to the North and South Poles, the lower the winter temperature, and the lower the use rate of lithium iron phosphate batteries. In order to maintain the performance of the battery in low temperature conditions, the battery needs to be heated.

[0003] However, the existing vehicle battery heating system generally heats the battery at a preset high power, so that the preset temperature can be reached quickly, and then the heating is stopped, and the temperature drops quickly. This will cause the vehicle battery to be heated frequently when in extremely cold areas, resulting in energy waste. Summary of the invention

[0004] The purpose of the present invention is to provide a heating system for a vehicle battery and a control method thereof, so as to alleviate the technical problem that the vehicle battery is frequently heated when in an extremely cold area, resulting in energy waste, so as to reduce the number of battery heating times and improve energy utilization efficiency.

[0005] In a first aspect, an embodiment of the present invention provides a heating system for a vehicle-mounted battery, comprising: a battery module, a heating device arranged on the battery module, a first temperature sensor arranged on the battery module, a controller connected to the heating device, a second temperature sensor connected to the controller, and a DC power supply connected to both the battery module and the heating device; the DC power supply is connected to the controller; the controller is connected to a vehicle controller of the vehicle; the first temperature sensor is used to collect the battery temperature of the battery module and transmit the battery temperature to the controller; the second temperature sensor is used to collect the ambient temperature and transmit the ambient temperature to the controller; the controller is used to obtain the The vehicle controller sends a charging status signal of the battery module; when the charging status signal is charging, determine whether the battery temperature is less than a first preset temperature threshold; when the battery temperature is less than the first preset temperature threshold, query the first target heating power corresponding to the ambient temperature from a preset first power curve; control the DC power supply to output the charging voltage of the battery module and the first supply voltage corresponding to the first target heating power, so as to charge the battery module through the charging voltage and power the heating device through the first supply voltage until the battery temperature is greater than or equal to the second preset temperature threshold; control the DC power supply to stop powering; when the charging status signal is not charging , determine whether the battery temperature is less than a third preset temperature threshold; the third preset temperature threshold is greater than the first preset temperature threshold; when the battery temperature is less than the third preset temperature threshold, query the second target heating power corresponding to the ambient temperature from a preset second power curve; and obtain the current battery voltage of the battery module; calculate the first heating power of the battery module according to the current battery voltage; calculate the first actual power required by the heating device to heat the battery module to the second preset temperature threshold based on the first heating power and the second target heating power; control the DC power supply to output the second supply voltage of the first actual power, so as to Supply power to the heating device until the battery temperature is greater than or equal to the second preset temperature threshold; control the DC power supply to stop supplying power; wherein the first power curve is constructed based on the historical ambient temperature and the first experimental heating power; the first experimental heating power is the power required for the heating device corresponding to the historical ambient temperature to heat the battery module from the first preset temperature threshold to the second preset temperature threshold; the second power curve is constructed based on the historical ambient temperature and the second experimental heating power; the second experimental heating power is the power required for the heating device corresponding to the historical ambient temperature to heat the battery module from the battery temperature to the second preset temperature threshold.

[0006] In a preferred embodiment of the present invention, the controller is also used to obtain the historical ambient temperature and the first experimental heating power corresponding to the historical ambient temperature and the second experimental heating power corresponding to the historical ambient temperature before obtaining the charging status signal of the battery module sent by the vehicle controller; draw the first power curve according to the historical ambient temperature and the first experimental heating power corresponding to the historical ambient temperature; draw the second power curve according to the historical ambient temperature and the second experimental heating power corresponding to the historical ambient temperature.

[0007] In a preferred embodiment of the present invention, the heating device is a heating film; the positive electrode and the negative electrode of the heating film are connected to the positive and negative electrodes of the DC power supply through a first relay and a second relay respectively.

[0008] In a preferred embodiment of the present invention, the controller is also used to determine whether the battery temperature is greater than or equal to the second preset temperature threshold; if so, the first relay and the second relay are controlled to be disconnected, and the DC power supply is controlled to stop outputting current.

[0009] In a preferred embodiment of the present invention, the controller is also used to determine whether the battery temperature is greater than or equal to the first preset temperature threshold and less than the second preset temperature threshold; if so, calculate the second heating power of the battery module according to the current battery voltage; calculate the second actual power required for the heating device to heat the battery module to the second preset temperature threshold based on the second preset temperature threshold and the second heating power; control the DC power supply to output a third supply voltage of the second actual power, so as to power the heating device through the third supply voltage until the battery temperature is greater than or equal to the second preset temperature threshold.

[0010] In a preferred embodiment of the present invention, the first preset temperature threshold is 5 degrees Celsius; the second preset temperature threshold is 10 degrees Celsius; and the third preset temperature threshold is 8 degrees Celsius.

[0011] In a preferred embodiment of the present invention, the battery module and the heating device are connected to a current detection sensor; the current detection sensor is connected to the controller; the current detection sensor is used to detect the average real-time current passing through the battery module and the heating device in a preset time period; the controller is also used to adjust the current value passing through the battery module and the heating device based on the average real-time current and the first power supply voltage, and power the battery module and the heating device with the adjusted current value.

[0012] In a preferred embodiment of the present invention, the current detection sensor is a Hall sensor.

[0013] In a preferred embodiment of the present invention, the controller is also used to determine whether the battery temperature is less than the third preset temperature threshold when the charging state signal is a discharge signal, and if not, control the battery module to perform a discharge operation.

[0014] In a preferred embodiment of the present invention, the controller is communicatively connected to the DC power supply and the battery module respectively via a serial bus.

[0015] In a preferred embodiment of the present invention, the controller is further used to obtain the internal resistance of the battery module; and calculate the first heating power of the battery module according to the internal resistance and the current battery voltage.

[0016] In a second aspect, an embodiment of the present invention further provides a control method for a heating system of a vehicle-mounted battery, which is applied to the heating system of the vehicle-mounted battery; the method comprises: collecting the battery temperature of the battery module through a first temperature sensor, and transmitting the battery temperature to the controller; collecting the ambient temperature through a second temperature sensor, and transmitting the ambient temperature to the controller; obtaining a charging status signal of the battery module sent by the vehicle controller; when the charging status signal is charging, determining whether the battery temperature is less than a first preset temperature threshold; when the battery temperature is less than the first preset temperature threshold, querying a first target heating power corresponding to the ambient temperature from a preset first power curve; controlling the DC power supply to output a charging voltage of the battery module and a first supply voltage corresponding to the first target heating power, so as to charge the battery module through the charging voltage, and power the heating device through the first supply voltage until the battery temperature is greater than or equal to the second preset temperature threshold; controlling the DC power supply to stop powering; when the charging status signal is not charging, determining whether the battery temperature is less than a third preset temperature threshold; the third preset temperature threshold is greater than the first preset temperature threshold; when the battery temperature is less than the first preset temperature threshold a third preset temperature threshold, querying the second target heating power corresponding to the above-mentioned ambient temperature from the preset second power curve; and obtaining the current battery voltage of the above-mentioned battery module; calculating the first heating power of the above-mentioned battery module according to the above-mentioned current battery voltage; calculating the first actual power required for the above-mentioned heating device to heat the above-mentioned battery module to the above-mentioned second preset temperature threshold based on the above-mentioned first heating power and the above-mentioned second target heating power; controlling the above-mentioned DC power supply to output the second supply voltage of the above-mentioned first actual power, so as to power the above-mentioned heating device through the above-mentioned second supply voltage until the above-mentioned battery temperature is greater than or equal to the above-mentioned second preset temperature threshold; controlling the above-mentioned DC power supply to stop supplying power; wherein the above-mentioned first power curve is constructed based on the historical ambient temperature and the first experimental heating power; the above-mentioned first experimental heating power is the power required for the above-mentioned heating device corresponding to the above-mentioned historical ambient temperature to heat the above-mentioned battery module from the above-mentioned first preset temperature threshold to the above-mentioned second preset temperature threshold; the above-mentioned second power curve is constructed based on the above-mentioned historical ambient temperature and the second experimental heating power; the above-mentioned second experimental heating power is the power required for the above-mentioned heating device corresponding to the above-mentioned historical ambient temperature to heat the above-mentioned battery module from the above-mentioned battery temperature to the above-mentioned second preset temperature threshold.

[0017] The embodiments of the present invention have the following beneficial technical effects:

[0018] An embodiment of the present invention provides a vehicle-mounted battery heating system and a control method thereof, comprising: a battery module, a heating device arranged on the battery module, a first temperature sensor arranged on the battery module, a controller connected to the heating device, a second temperature sensor connected to the controller, and a DC power supply connected to both the battery module and the heating device; the DC power supply is connected to the controller; the controller is connected to a vehicle controller of the vehicle; the first temperature sensor is used to collect the battery temperature of the battery module and transmit the battery temperature to the controller; the second temperature sensor is used to collect the ambient temperature and transmit the ambient temperature to the controller; the controller is used to obtain the The vehicle controller sends a charging status signal of the battery module; when the charging status signal is charging, determine whether the battery temperature is less than a first preset temperature threshold; when the battery temperature is less than the first preset temperature threshold, query the first target heating power corresponding to the ambient temperature from a preset first power curve; control the DC power supply to output the charging voltage of the battery module and the first supply voltage corresponding to the first target heating power, so as to charge the battery module through the charging voltage and power the heating device through the first supply voltage until the battery temperature is greater than or equal to the second preset temperature threshold; control the DC power supply to stop powering; when the charging status signal is not charging , determine whether the battery temperature is less than a third preset temperature threshold; the third preset temperature threshold is greater than the first preset temperature threshold; when the battery temperature is less than the third preset temperature threshold, query the second target heating power corresponding to the ambient temperature from a preset second power curve; and obtain the current battery voltage of the battery module; calculate the first heating power of the battery module according to the current battery voltage; calculate the first actual power required by the heating device to heat the battery module to the second preset temperature threshold based on the first heating power and the second target heating power; control the DC power supply to output the second supply voltage of the first actual power, so as to Supply power to the heating device until the battery temperature is greater than or equal to the second preset temperature threshold; control the DC power supply to stop supplying power; wherein the first power curve is constructed based on the historical ambient temperature and the first experimental heating power; the first experimental heating power is the power required for the heating device corresponding to the historical ambient temperature to heat the battery module from the first preset temperature threshold to the second preset temperature threshold; the second power curve is constructed based on the historical ambient temperature and the second experimental heating power; the second experimental heating power is the power required for the heating device corresponding to the historical ambient temperature to heat the battery module from the battery temperature to the second preset temperature threshold.This technology dynamically adjusts the heating power according to the battery temperature and ambient temperature, so that the battery can be heated to the preset temperature more slowly, thus avoiding excessive heating frequency and resulting in energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic structural diagram of a vehicle battery heating system provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the connection between a heating film and a DC power supply provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the connection relationship of a current detection sensor provided by an embodiment of the present invention;

[0023] Figure 4 A schematic flow chart of a control method for a vehicle-mounted battery heating system provided in an embodiment of the present invention.

[0024] Icons: 11 - battery module; 12 - heating device; 13 - first temperature sensor; 14 - controller; 15 - second temperature sensor; 16 - DC power supply; 21 - first relay; 22 - second relay; 23 - current detection sensor. DETAILED DESCRIPTION

[0025] 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.

[0026] The existing vehicle battery heating system generally heats the battery at a preset higher power, so that the preset temperature can be reached quickly, and then the heating is stopped, and the temperature drops quickly. This will cause the vehicle battery to be heated frequently when in extremely cold areas, resulting in energy waste.

[0027] Based on this, an embodiment of the present invention provides a vehicle-mounted battery heating system and a control method thereof. The technology can dynamically adjust the power during heating according to the battery temperature and the ambient temperature, so that the battery can be heated to a preset temperature relatively slowly, thereby avoiding the situation where the heating frequency is too high and energy is wasted. For ease of understanding, a vehicle-mounted battery heating system is first introduced.

[0028] Example 1

[0029] In this embodiment, Figure 1 A schematic structural diagram of a vehicle battery heating system provided in an embodiment of the present invention.

[0030] Depend on Figure 1As can be seen, the heating system of the vehicle-mounted battery includes: a battery module 11, a heating device 12 arranged on the battery module 11, a first temperature sensor 13 arranged on the battery module 11, a controller 14 connected to the heating device 12, a second temperature sensor 15 connected to the controller 14, and a DC power supply 16 connected to the battery module 11 and the heating device 12; the DC power supply is connected to the controller 14; the controller 14 is connected to the vehicle controller of the vehicle; the first temperature sensor 13 is used to collect the battery temperature of the battery module 11 and transmit the battery temperature to the controller 14; the second temperature sensor 15 is used to collect the ambient temperature and transmit the ambient temperature to the controller 14; The ambient temperature is transmitted to the controller 14; the controller 14 is used to obtain the charging status signal of the battery module 11 sent by the vehicle controller 14; when the charging status signal is charging, determine whether the battery temperature is less than the first preset temperature threshold; when the battery temperature is less than the first preset temperature threshold, query the first target heating power corresponding to the ambient temperature from the preset first power curve; control the DC power supply 16 to output the charging voltage of the battery module 11 and the first supply voltage corresponding to the first target heating power, so as to charge the battery module 11 through the charging voltage, and power the heating device 12 through the first supply voltage until the battery temperature greater than or equal to a second preset temperature threshold; controlling the DC power supply 16 to stop supplying power; when the charging status signal indicates that the battery is not charging, determining whether the battery temperature is less than a third preset temperature threshold; the third preset temperature threshold is greater than the first preset temperature threshold; when the battery temperature is less than the third preset temperature threshold, querying the second target heating power corresponding to the ambient temperature from a preset second power curve; and obtaining the current battery voltage of the battery module 11; calculating the first heating power of the battery module 11 according to the current battery voltage; and calculating the heating time of the heating device 12 to heat the battery module 11 to the second preset temperature based on the first heating power and the second target heating power. The first actual power required when the temperature threshold is reached; the DC power supply 16 is controlled to output the second supply voltage of the first actual power, so as to power the heating device through the second supply voltage until the battery temperature is greater than or equal to the second preset temperature threshold; the DC power supply 16 is controlled to stop supplying power; wherein the first power curve is constructed based on the historical ambient temperature and the first experimental heating power; the first experimental heating power is the power required for the heating device 12 corresponding to the historical ambient temperature to heat the battery module 11 from the first preset temperature threshold to the second preset temperature threshold; the second power curve is constructed based on the historical ambient temperature and the second experimental heating power;The second experimental heating power is the power required by the heating device 12 corresponding to the historical ambient temperature to heat the battery module 11 from the battery temperature to the second preset temperature threshold.

[0031] In this embodiment, since the battery module 11 is in a charging state, as the charging state continues, the current battery voltage of the battery module 11 increases accordingly. Since the battery module 11 has internal resistance, heat power is generated during the charging state.

[0032] Therefore, when the battery temperature is lower than the first preset temperature threshold, the charging voltage of the battery module 11 and the first supply voltage corresponding to the first target heating power are output through the DC power supply 16, and are superimposed on the battery module 11 and the heating device 12 for a period of time, so that the battery temperature is greater than or equal to the second preset temperature threshold.

[0033] Here, the above-mentioned action time can also be preset to at least 2 minutes for heating, and at least 2 minutes for charging.

[0034] Furthermore, when the charging status signal indicates that the battery module 11 is not charging, the battery module 11 stores electrical energy, and when the battery temperature is lower than a third preset temperature threshold, the current battery voltage of the battery module 11 is obtained, and based on the current battery voltage, the first heating power of the battery module 11 can be calculated.

[0035] Furthermore, according to the difference between the second target heating power and the first heating power, the first actual power required by the heating device 12 to heat the battery module 11 from the battery temperature to the second preset temperature threshold can be calculated.

[0036] In actual operation, the controller 14 is also used to obtain the historical ambient temperature and the first experimental heating power corresponding to the historical ambient temperature and the second experimental heating power corresponding to the historical ambient temperature before obtaining the charging status signal of the battery module sent by the vehicle controller; draw the first power curve according to the historical ambient temperature and the first experimental heating power corresponding to the historical ambient temperature; draw the second power curve according to the historical ambient temperature and the second experimental heating power corresponding to the historical ambient temperature.

[0037] Furthermore, the heating device 12 is a heating film; the positive electrode and the negative electrode of the heating film are connected to the positive and negative electrodes of the DC power supply 16 through the first relay 21 and the second relay 22 respectively.

[0038] For ease of understanding, Figure 2A schematic diagram of the connection between a heating film and a DC power supply provided in an embodiment of the present invention.

[0039] Furthermore, the controller 14 is also used to determine whether the battery temperature is greater than or equal to the second preset temperature threshold; if so, the first relay and the second relay are controlled to be disconnected, and the DC power supply 16 is controlled to stop outputting current.

[0040] Furthermore, the controller 14 is also used to determine whether the battery temperature is greater than or equal to the first preset temperature threshold and less than the second preset temperature threshold; if so, calculate the second heating power of the battery module 11 according to the current battery voltage; based on the second preset temperature threshold and the second heating power, calculate the second actual power required for the heating device to heat the battery module 11 to the second preset temperature threshold; control the DC power supply 16 to output a third supply voltage of the second actual power, so as to power the heating device 12 through the third supply voltage until the battery temperature is greater than or equal to the second preset temperature threshold.

[0041] In actual operation, the first preset temperature threshold is 5 degrees Celsius; the second preset temperature threshold is 10 degrees Celsius; and the third preset temperature threshold is 8 degrees Celsius.

[0042] Furthermore, the battery module 11 and the heating device 12 are connected to a current detection sensor 23; the current detection sensor 23 is connected to the controller 14; the current detection sensor 23 is used to detect the average real-time current passing through the battery module and the heating device 12 in a preset time period; the controller 14 is also used to adjust the current value passing through the battery module 11 and the heating device 12 based on the average real-time current and the first power supply voltage, and supply power to the battery module 11 and the heating device 12 with the adjusted current value.

[0043] For ease of understanding, Figure 3 A schematic diagram of the connection relationship of a current detection sensor provided by an embodiment of the present invention.

[0044] In one embodiment, the current detection sensor 23 is a Hall sensor.

[0045] Furthermore, the controller 14 is also used to determine whether the battery temperature is lower than the third preset temperature threshold when the charging state signal is a discharge signal, and if not, control the battery module 11 to perform a discharge operation.

[0046] In actual operation, the controller is respectively connected to the DC power supply 16 and the battery module 11 via a serial bus.

[0047] Furthermore, the controller 14 is also used to obtain the internal resistance of the battery module 11 ; and calculate the first heating power of the battery module 11 according to the internal resistance and the current battery voltage.

[0048] An embodiment of the present invention provides a heating system for a vehicle-mounted battery, comprising: a battery module, a heating device arranged on the battery module, a first temperature sensor arranged on the battery module, a controller connected to the heating device, a second temperature sensor connected to the controller, and a DC power supply connected to both the battery module and the heating device; the DC power supply is connected to the controller; the controller is connected to a vehicle controller of the vehicle; the first temperature sensor is used to collect the battery temperature of the battery module and transmit the battery temperature to the controller; the second temperature sensor is used to collect the ambient temperature and transmit the ambient temperature to the controller; the controller is used to obtain the vehicle controller the charging status signal of the battery module sent by the device; when the charging status signal is charging, determining whether the battery temperature is less than a first preset temperature threshold; when the battery temperature is less than the first preset temperature threshold, querying the first target heating power corresponding to the ambient temperature from a preset first power curve; controlling the DC power supply to output the charging voltage of the battery module and the first supply voltage corresponding to the first target heating power, so as to charge the battery module through the charging voltage and supply power to the heating device through the first supply voltage until the battery temperature is greater than or equal to the second preset temperature threshold; controlling the DC power supply to stop supplying power; when the charging status signal is not charging, determining whether the battery temperature is less than a third preset temperature threshold; the third preset temperature threshold is greater than the first preset temperature threshold; when the battery temperature is less than the third preset temperature threshold, query the second target heating power corresponding to the ambient temperature from a preset second power curve; and obtain the current battery voltage of the battery module; calculate the first heating power of the battery module according to the current battery voltage; calculate the first actual power required by the heating device to heat the battery module to the second preset temperature threshold based on the first heating power and the second target heating power; control the DC power supply to output the second supply voltage of the first actual power, so as to provide the first actual power to the battery module through the second supply voltage. The above-mentioned heating device supplies power until the above-mentioned battery temperature is greater than or equal to the above-mentioned second preset temperature threshold; the above-mentioned DC power supply is controlled to stop supplying power; wherein the above-mentioned first power curve is constructed based on the historical ambient temperature and the first experimental heating power; the above-mentioned first experimental heating power is the power required for the above-mentioned heating device corresponding to the above-mentioned historical ambient temperature to heat the above-mentioned battery module from the above-mentioned first preset temperature threshold to the above-mentioned second preset temperature threshold; the above-mentioned second power curve is constructed based on the above-mentioned historical ambient temperature and the second experimental heating power; the above-mentioned second experimental heating power is the power required for the above-mentioned heating device corresponding to the above-mentioned historical ambient temperature to heat the above-mentioned battery module from the above-mentioned battery temperature to the above-mentioned second preset temperature threshold.This technology dynamically adjusts the heating power according to the battery temperature and ambient temperature, so that the battery can be heated to the preset temperature more slowly, thus avoiding excessive heating frequency and resulting in energy waste.

[0049] Example 2

[0050] Based on the above embodiments, Figure 4 A schematic flow chart of a control method for a vehicle-mounted battery heating system provided in an embodiment of the present invention.

[0051] The control method of the vehicle battery heating system is applied to the vehicle battery heating system in the above embodiment.

[0052] Depend on Figure 4 As can be seen, the method includes:

[0053] Step S101: collecting the battery temperature of the battery module through the first temperature sensor, and transmitting the battery temperature to the controller.

[0054] Step S102: collecting the ambient temperature through the second temperature sensor, and transmitting the ambient temperature to the controller.

[0055] Step S103: Obtain the charging status signal of the battery module sent by the vehicle controller; when the charging status signal indicates that the battery module is charging, determine the relationship between the battery temperature and the first, second, and third preset temperature thresholds, and control the DC power supply to output a corresponding charging voltage based on the relationship.

[0056] Specifically, determine whether the battery temperature is less than a first preset temperature threshold; when the battery temperature is less than the first preset temperature threshold, query the first target heating power corresponding to the ambient temperature from a preset first power curve; control the DC power supply to output the charging voltage of the battery module and the first supply voltage corresponding to the first target heating power, so as to charge the battery module through the charging voltage, and power the heating device through the first supply voltage until the battery temperature is greater than or equal to the second preset temperature threshold; control the DC power supply to stop supplying power; when the charging status signal is not charging, determine whether the battery temperature is less than a third preset temperature threshold; the third preset temperature threshold is greater than the first preset temperature threshold; when the battery temperature is less than the third preset temperature threshold, query the second target heating power corresponding to the ambient temperature from a preset second power curve; and obtain the current battery voltage of the battery module; calculate the first Heating power; based on the above-mentioned first heating power and the above-mentioned second target heating power, calculating the first actual power required by the above-mentioned heating device to heat the above-mentioned battery module to the above-mentioned second preset temperature threshold; controlling the above-mentioned DC power supply to output the second supply voltage of the above-mentioned first actual power, so as to power the above-mentioned heating device through the above-mentioned second supply voltage until the above-mentioned battery temperature is greater than or equal to the above-mentioned second preset temperature threshold; controlling the above-mentioned DC power supply to stop supplying power; wherein the above-mentioned first power curve is constructed based on the historical ambient temperature and the first experimental heating power; the above-mentioned first experimental heating power is the power required by the above-mentioned heating device corresponding to the above-mentioned historical ambient temperature to heat the above-mentioned battery module from the above-mentioned first preset temperature threshold to the above-mentioned second preset temperature threshold; the above-mentioned second power curve is constructed based on the above-mentioned historical ambient temperature and the second experimental heating power; the above-mentioned second experimental heating power is the power required by the above-mentioned heating device corresponding to the above-mentioned historical ambient temperature to heat the above-mentioned battery module from the above-mentioned battery temperature to the above-mentioned second preset temperature threshold.

[0057] The control method of the vehicle battery heating system provided in the embodiment of the present invention has the same technical features as the vehicle battery heating system provided in the above embodiment, so it can also solve the same technical problems and achieve the same technical effects. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the method described above can refer to the corresponding process of the system in the above embodiment, and will not be repeated here.

[0058] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the aforementioned embodiments, those of ordinary skill in the art should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed by the present invention, or can easily conceive of changes, or make equivalent replacements for some of the technical features therein. Such modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. A heating system for a vehicle battery, characterized in that: include: A battery module, a heating device arranged on the battery module, a first temperature sensor arranged on the battery module, a controller connected to the heating device, a second temperature sensor connected to the controller, and a DC power supply connected to both the battery module and the heating device; the DC power supply is connected to the controller; the controller is connected to a vehicle controller of the vehicle; The first temperature sensor is used to collect the battery temperature of the battery module and transmit the battery temperature to the controller; The second temperature sensor is used to collect the ambient temperature and transmit the ambient temperature to the controller; The controller is used to obtain a charging status signal of the battery module sent by the vehicle controller; when the charging status signal is charging, determine whether the battery temperature is less than a first preset temperature threshold; when the battery temperature is less than the first preset temperature threshold, query the first target heating power corresponding to the ambient temperature from a preset first power curve; control the DC power supply to output the charging voltage of the battery module and the first supply voltage corresponding to the first target heating power, so as to charge the battery module through the charging voltage and power the heating device through the first supply voltage until the battery temperature is greater than or equal to a second preset temperature threshold; control the DC power supply to stop supplying power; when the charging status signal is not charging, determine whether the battery temperature is less than a third preset temperature threshold temperature threshold; the third preset temperature threshold is greater than the first preset temperature threshold; when the battery temperature is less than the third preset temperature threshold, query the second target heating power corresponding to the ambient temperature from the preset second power curve; and obtain the current battery voltage of the battery module; calculate the first heating power of the battery module according to the current battery voltage; based on the first heating power and the second target heating power, calculate the first actual power required by the heating device to heat the battery module to the second preset temperature threshold; control the DC power supply to output the second supply voltage of the first actual power, so as to power the heating device through the second supply voltage until the battery temperature is greater than or equal to the second preset temperature threshold; control the DC power supply to stop supplying power; The first power curve is constructed based on the historical ambient temperature and the first experimental heating power; the first experimental heating power is the power required by the heating device corresponding to the historical ambient temperature to heat the battery module from the first preset temperature threshold to the second preset temperature threshold; The second power curve is constructed based on the historical ambient temperature and the second experimental heating power; the second experimental heating power is the power required by the heating device corresponding to the historical ambient temperature to heat the battery module from the battery temperature to the second preset temperature threshold.

2. The vehicle battery heating system according to claim 1, characterized in that: The controller is also used to obtain the historical ambient temperature and the first experimental heating power corresponding to the historical ambient temperature and the second experimental heating power corresponding to the historical ambient temperature before obtaining the charging status signal of the battery module sent by the vehicle controller; draw the first power curve according to the historical ambient temperature and the first experimental heating power corresponding to the historical ambient temperature; draw the second power curve according to the historical ambient temperature and the second experimental heating power corresponding to the historical ambient temperature.

3. The vehicle battery heating system according to claim 1, characterized in that: The heating device is a heating film; the positive electrode and the negative electrode of the heating film are connected to the positive and negative electrodes of the DC power supply through a first relay and a second relay respectively.

4. The vehicle battery heating system according to claim 3, characterized in that: The controller is also used to determine whether the battery temperature is greater than or equal to the second preset temperature threshold; if so, control the first relay and the second relay to be disconnected, and control the DC power supply to stop outputting current.

5. The vehicle-mounted battery heating system according to claim 1, characterized in that: The controller is also used to determine whether the battery temperature is greater than or equal to the first preset temperature threshold and less than the second preset temperature threshold; if so, calculate the second heating power of the battery module according to the current battery voltage; based on the second preset temperature threshold and the second heating power, calculate the second actual power required for the heating device to heat the battery module to the second preset temperature threshold; control the DC power supply to output a third supply voltage of the second actual power to power the heating device through the third supply voltage until the battery temperature is greater than or equal to the second preset temperature threshold.

6. The vehicle battery heating system according to claim 1, characterized in that: The first preset temperature threshold is 5 degrees Celsius; the second preset temperature threshold is 10 degrees Celsius; and the third preset temperature threshold is 8 degrees Celsius.

7. The vehicle battery heating system according to claim 1, characterized in that: The battery module and the heating device are connected to a current detection sensor; the current detection sensor is connected to the controller; The current detection sensor is used to detect the average real-time current passing through the battery module and the heating device in a preset time period; The controller is also used to adjust the current value passing through the battery module and the heating device based on the average real-time current and the first power supply voltage, and to supply power to the battery module and the heating device with the adjusted current value.

8. The vehicle battery heating system according to claim 7, characterized in that: The type of the current detection sensor is a Hall sensor.

9. The vehicle battery heating system according to claim 1, characterized in that: The controller is further configured to, when the charging state signal is a discharging signal, determine whether the battery temperature is less than the third preset temperature threshold, and if not, control the battery module to perform a discharging operation.

10. The vehicle battery heating system according to claim 1, characterized in that: The controller is communicatively connected with the DC power supply and the battery module respectively via a serial bus.

11. The vehicle battery heating system according to claim 1, characterized in that: The controller is further used to obtain the internal resistance of the battery module; and calculate the first heating power of the battery module according to the internal resistance and the current battery voltage.

12. A method for controlling a heating system of a vehicle-mounted battery, characterized in that: A heating system for a vehicle battery according to any one of claims 1 to 11; the method comprising: Collecting the battery temperature of the battery module by means of a first temperature sensor, and transmitting the battery temperature to the controller; Collecting the ambient temperature through a second temperature sensor, and transmitting the ambient temperature to the controller; Obtain the charging status signal of the battery module sent by the vehicle controller; when the charging status signal is charging, determine whether the battery temperature is less than a first preset temperature threshold; when the battery temperature is less than the first preset temperature threshold, query the first target heating power corresponding to the ambient temperature from the preset first power curve; control the DC power supply to output the charging voltage of the battery module and the first supply voltage corresponding to the first target heating power, so as to charge the battery module through the charging voltage and power the heating device through the first supply voltage until the battery temperature is greater than or equal to the second preset temperature threshold; control the DC power supply to stop supplying power; when the charging status signal is not charging, determine whether the battery temperature is less than a third preset temperature threshold; the third preset temperature threshold is greater than the first preset temperature threshold; when the battery temperature is less than the third preset temperature threshold, query the second target heating power corresponding to the ambient temperature from the preset second power curve; and obtain the current battery voltage of the battery module; according to the The current battery voltage is used to calculate the first heating power of the battery module; based on the first heating power and the second target heating power, the first actual power required for the heating device to heat the battery module to the second preset temperature threshold is calculated; the DC power supply is controlled to output a second supply voltage of the first actual power to power the heating device through the second supply voltage until the battery temperature is greater than or equal to the second preset temperature threshold; the DC power supply is controlled to stop supplying power; wherein the first power curve is constructed based on the historical ambient temperature and the first experimental heating power; the first experimental heating power is the power required for the heating device corresponding to the historical ambient temperature to heat the battery module from the first preset temperature threshold to the second preset temperature threshold; the second power curve is constructed based on the historical ambient temperature and the second experimental heating power; the second experimental heating power is the power required for the heating device corresponding to the historical ambient temperature to heat the battery module from the battery temperature to the second preset temperature threshold.

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