Battery temperature control method and device and vehicle

Abstract

The invention discloses a battery temperature control method and device and a vehicle. The method comprises the steps that the temperature of a battery pack is obtained; according to the temperature of the battery pack, whether the hybrid vehicle is in a fierce driving working condition or not is judged; if the hybrid vehicle is in the intense driving working condition, the operation power of a battery pack is obtained; and if the operation power of the battery pack is greater than the first power, limiting the operation power of the battery pack according to the temperature of the battery pack, so that the heat generated by the battery pack is less than or equal to the heat dissipation heat of the battery pack before the temperature of the battery pack reaches a target temperature threshold. Therefore, under the intense driving condition of the hybrid vehicle, over-temperature and out-of-control of the battery pack can be effectively avoided, meanwhile, refrigeration of the passenger compartment can be taken into consideration, and the driving safety and comfort are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a battery temperature control method, device and vehicle. Background Art

[0002] For hybrid vehicles, since their batteries are power-type batteries, their charge and discharge rates are higher than those of energy-type batteries in the same system. Also, since the battery packs in hybrid vehicles are relatively small, they generate more heat and dissipate heat more slowly. When users drive hybrid vehicles in intense driving situations, the battery packs heat up quickly, which can easily lead to problems such as loss of cooling in the passenger compartment or high battery temperatures. Summary of the invention

[0003] In view of the above problems, the present invention is proposed to provide a battery temperature control method, device and vehicle to solve the problem of excessive battery pack temperature and loss of cooling in the passenger compartment of a hybrid vehicle under intense driving conditions.

[0004] According to a first aspect of the present invention, a battery temperature control method is provided, which is applied to a hybrid vehicle;

[0005] The method comprises:

[0006] Get the battery pack temperature;

[0007] determining, based on the battery pack temperature, whether the hybrid vehicle is in an intense driving condition;

[0008] If the hybrid vehicle is in the intense driving condition, obtaining the operating power of the battery pack;

[0009] If the operating power of the battery pack is greater than the first power, the operating power of the battery pack is limited according to the battery pack temperature so that the heat generated by the battery pack is less than or equal to the heat dissipated by the battery pack before the battery pack temperature reaches a target temperature threshold.

[0010] Optionally, judging whether the hybrid vehicle is in an intense driving condition according to the battery pack temperature includes:

[0011] comparing the battery pack temperature to an initial temperature threshold;

[0012] If the battery pack temperature reaches the initial temperature threshold, the hybrid vehicle is in an intense driving condition;

[0013] If the battery pack temperature does not reach the initial temperature threshold, the hybrid vehicle is not in an intense driving condition.

[0014] Optionally, before the step of comparing the battery pack temperature with the initial temperature threshold, the method further includes:

[0015] Acquiring an energy over-temperature threshold of the hybrid vehicle, where the energy over-temperature threshold is a temperature value at which the hybrid vehicle determines that all air conditioning cooling capacity is used for cooling the battery pack;

[0016] The initial temperature threshold is determined according to the energy over-temperature threshold.

[0017] Optionally, the initial temperature threshold is less than or equal to the energy over-temperature threshold.

[0018] Optionally, if the operating power of the battery pack is greater than the first power, limiting the operating power of the battery pack according to the temperature of the battery pack includes:

[0019] According to the battery pack temperature, searching in a preset temperature-power relationship table to determine the target power corresponding to the battery pack temperature; the temperature-power relationship table includes the target battery pack temperature and the target power corresponding to the target battery pack temperature;

[0020] The operation of the battery pack is controlled based on the target power corresponding to the temperature of the battery pack.

[0021] Optionally, the step of constructing the temperature-power relationship table includes:

[0022] Constructing an extreme heat test condition for testing the hybrid vehicle;

[0023] Under the extreme heat test condition, repeatedly charging the battery pack with a preset time period at a rated power and discharging the battery pack with a preset time period at a rated power;

[0024] Adjusting the calibrated power until the heat generated by the battery pack is equal to the heat dissipated by the battery pack, thereby obtaining a second power corresponding to the target temperature threshold;

[0025] The temperature-power relationship table is constructed based on the target temperature threshold and the second power corresponding to the target temperature threshold, wherein the value range of the target battery pack temperature in the temperature-power relationship is determined by the initial temperature threshold and the target temperature threshold, and the value range of the target power in the temperature-power relationship is determined by the first power and the second power, wherein the second power is less than the first power, and the target temperature threshold is greater than the initial temperature threshold.

[0026] Optionally, the construction of the extreme heat test condition includes:

[0027] Determining a battery test power according to the battery pack power when the engine of the hybrid vehicle is in operation;

[0028] Set the target ambient temperature, battery initial temperature, and cooling water operating parameters;

[0029] The extreme heat test condition is determined according to the battery test power, the target ambient temperature, the battery initial temperature and the operating parameters of the cooling water.

[0030] According to a second aspect of the present invention, there is provided a battery temperature control device, comprising:

[0031] A first acquisition module is used to acquire the battery pack temperature;

[0032] A judgment module, used for judging whether the hybrid vehicle is in an intense driving condition according to the temperature of the battery pack;

[0033] A second acquisition module, configured to acquire the operating power of the battery pack if the hybrid vehicle is in the intense driving condition;

[0034] A control module is used to limit the operating power of the battery pack according to the battery pack temperature if the operating power of the battery pack is greater than a first power, so that the heat generated by the battery pack is less than or equal to the heat dissipated by the battery pack before the battery pack temperature reaches a target temperature threshold.

[0035] According to a third aspect of the present invention, a controller is provided. The controller includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the above-mentioned battery temperature control method.

[0036] According to a fourth aspect of the present invention, a vehicle is provided, the vehicle comprising a vehicle body and a controller installed in the vehicle body, wherein the controller executes the above-mentioned battery temperature control method.

[0037] The above one or more technical solutions in the embodiments of this specification have at least the following technical effects:

[0038] The embodiments of this specification provide a battery temperature control method, device and vehicle, which obtains the battery pack temperature; determines whether the hybrid vehicle is in an intense driving condition based on the battery pack temperature; if the hybrid vehicle is in the intense driving condition, obtains the operating power of the battery pack; if the operating power of the battery pack is greater than the first power, limits the operating power of the battery pack based on the battery pack temperature, so that before the battery pack temperature reaches the target temperature threshold, the heat generated by the battery pack is less than or equal to the heat dissipated by the battery pack. In this way, the hybrid vehicle can effectively avoid over-temperature runaway of the battery pack under intense driving conditions, while also taking into account the cooling of the passenger compartment to improve driving safety and comfort.

[0039] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Also, throughout the accompanying drawings, the same reference figures are used to represent the same components. In the drawings:

[0041] Figure 1 A flow chart of a battery temperature control method in an embodiment of the present invention is shown.

[0042] Figure 2 A block diagram of a battery temperature control device in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0043] 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.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0046] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] For hybrid vehicles, since their batteries are power-type batteries, their charge and discharge rates are higher than those of energy-type batteries in the same system. Also, since the battery packs in hybrid vehicles are relatively small, they generate more heat and dissipate heat more slowly. When users drive hybrid vehicles under intense driving conditions, the battery pack temperature rises quickly, which can easily lead to problems such as loss of cooling in the passenger compartment or high battery temperatures.

[0048] The energy of a hybrid vehicle battery pack is generally 20-50 kwh. This embodiment takes a battery pack using ternary NCM materials as an example, and its safe charge and discharge temperature boundary conditions are generally: charging at -20 to 55 degrees, and discharging at -30 to 55 degrees.

[0049] Since NCM cells are more active, their over-temperature can easily lead to the risk of thermal runaway. In order to reduce this risk, over-temperature protection is set. In the prior art, the first level of battery over-temperature is generally set to 50 degrees. At this time, the hybrid vehicle only records a reminder and does not limit the battery pack power. The second level of battery over-temperature is set to 54 degrees. At this time, the hybrid vehicle will light up the fault light and limit the charging and discharging power, for example, reducing the charging and discharging power to 60%. The third level of battery over-temperature is set to 57 degrees. At this time, the hybrid vehicle will directly cut off the high voltage. Under normal circumstances, the discharge boundary of the battery pack is 55 degrees. If the battery pack temperature reaches 57 degrees, it means that the battery pack is abnormally discharged at this time, and the battery pack may be in thermal runaway, or even catch fire and explode, causing the car to burn. In order to prevent the above dangerous situation, even if the hybrid vehicle is driving at this time, it is necessary to cut off the high voltage directly. After cutting off the high voltage, the vehicle can still limp for a distance based on inertia.

[0050] In addition, in response to battery overheating, hybrid vehicles will adjust the cooling capacity of the air-conditioning compressor according to the situation to adjust the distribution ratio of battery pack cooling and passenger compartment cooling. When the battery pack temperature is lower than 42 degrees, the cooling capacity will be used to cool the passenger compartment first, and the rest will be used to cool the battery pack. When the battery pack temperature is greater than 42 and less than 50 degrees, the cooling capacity will be used to cool the battery pack first and then the passenger compartment. When the battery pack temperature is greater than or equal to 50 degrees, all the cooling capacity will be used to cool the battery pack to prevent the battery pack temperature from further increasing and causing the risk of thermal runaway.

[0051] However, since the battery of a hybrid vehicle belongs to a power battery, its instantaneous charge and discharge rate is relatively high. When the user drives intensely (for example, a hybrid vehicle runs at a speed of 100-160km / h on the highway), due to the high battery discharge rate, its temperature rises quickly, and due to the small size of the hybrid battery pack, its heat dissipation system has limited heat dissipation. Under intense driving conditions, it is impossible to effectively control the cooling of the battery pack, resulting in a continuous rise in battery temperature. In addition, hybrid vehicles are equipped with fuel tanks. When the battery power is lower than the intervention point (for example, the intervention point is 20% of the battery power), the engine will intervene, thereby extending the duration of the intense driving condition. When the intense driving condition lasts too long (for example, for more than 1h), the battery pack may heat up to 50 degrees. At this time, the air conditioning cooling capacity will be used entirely to cool the battery pack, and the passenger compartment will lose cooling. If the intense driving condition continues further, the battery pack temperature may further rise to 54 degrees, and the hybrid vehicle will light the battery fault light, which will cause the user's hybrid vehicle to need to be repaired in the store later.

[0052] However, in actual use of hybrid vehicles, intense driving conditions are a normal demand of some users.

[0053] Based on the above situation, this embodiment provides a battery temperature control method to solve the problem of excessive battery temperature and loss of cooling in the passenger compartment under intense driving conditions of a hybrid vehicle.

[0054] Specifically, the embodiment of the present invention provides a battery temperature control method, combined with Figure 1 As shown in the flowchart, the battery temperature control method includes steps 101 to 104:

[0055] Step 101: Obtain the battery pack temperature;

[0056] In this embodiment, the method is applicable to hybrid vehicles. The battery pack capacity of hybrid vehicles is relatively small compared to other types of new energy vehicles. In particular, hybrid vehicles whose battery packs are power-type batteries. Power-type batteries focus on providing high power output in a short time. They have low internal resistance and high current discharge capacity, and can respond quickly to load requirements.

[0057] The hybrid vehicle of this embodiment will obtain the battery pack temperature in real time while driving. The battery pack temperature refers to the actual temperature of the battery pack in the hybrid vehicle, which is collected by the temperature sensor on the battery pack.

[0058] Step 102: judging whether the hybrid vehicle is in an intense driving condition according to the battery pack temperature;

[0059] It should be noted that the main basis for determining whether a hybrid vehicle is in an intense driving condition is the battery pack temperature. After obtaining the battery pack temperature, it is possible to determine whether the hybrid vehicle is in an intense driving condition based on the battery pack temperature. The specific determination steps may include:

[0060] comparing the battery pack temperature to an initial temperature threshold;

[0061] If the battery pack temperature reaches the initial temperature threshold, the hybrid vehicle is in an intense driving condition;

[0062] If the battery pack temperature does not reach the initial temperature threshold, the hybrid vehicle is not in an intense driving condition.

[0063] The initial temperature threshold refers to the temperature value that indicates that the hybrid vehicle is in an intense driving condition. In this embodiment, the initial temperature threshold may be determined based on the temperature value of the battery overheating level 1, and the specific steps may include:

[0064] Obtaining an energy over-temperature threshold of the hybrid vehicle;

[0065] The initial temperature threshold is determined according to the energy over-temperature threshold.

[0066] The energy overtemperature threshold is the temperature of the battery overtemperature level 1 mentioned above. The energy overtemperature threshold is the temperature value used by hybrid vehicles in the prior art to determine whether the air conditioning cooling capacity is fully used for battery pack cooling. For example, if the battery overtemperature level 1 temperature value is 50 degrees, then the energy overtemperature threshold is 50 degrees.

[0067] The initial temperature threshold is set based on the energy over-temperature threshold. Generally speaking, the initial temperature threshold is less than or equal to the energy over-temperature threshold. For example, the energy over-temperature threshold is 50 degrees, and the initial temperature threshold is set to 49 degrees. If the battery pack temperature does not reach 49 degrees, it is considered that the hybrid vehicle is not in an intense driving condition. If the battery pack temperature reaches 49 degrees, it is considered that the hybrid vehicle is in an intense driving condition, and the hybrid vehicle may need to exercise certain control over the battery pack operation.

[0068] It is easy to understand that the energy over-temperature threshold of a hybrid vehicle may vary depending on the battery pack.

[0069] Step 103: If the hybrid vehicle is in the intense driving condition, obtaining the operating power of the battery pack;

[0070] In this embodiment, the operating power of the battery pack refers to the discharge power or recharge power of the battery pack during driving. The recharge power refers to the charging power of the battery pack during driving, for example, charging the battery pack by braking the hybrid vehicle, or charging the battery pack if there is any remaining power after the engine output is provided to the vehicle first.

[0071] Step 104: If the operating power of the battery pack is greater than the first power, the operating power of the battery pack is limited according to the battery pack temperature so that the heat generated by the battery pack is less than or equal to the heat dissipated by the battery pack before the battery pack temperature reaches the target temperature threshold.

[0072] In this embodiment, if the operating power is less than or equal to the first power, it means that the hybrid vehicle should be traveling at a lower speed, the charge / discharge current of the battery pack is not large, and the heat generated is not much. The battery pack's own cooling system and air conditioning cooling capacity can be used for temperature reduction control, and the battery pack is less likely to heat up further. If the operating power is greater than the first power, it means that the hybrid vehicle should be traveling at a higher speed, the charge / discharge current of the battery pack is large, and the heat generation is fast. The battery pack's own cooling system and air conditioning cooling capacity may not be able to achieve temperature reduction control, and the battery pack is more likely to heat up further. At this time, it is necessary to limit the operating power of the battery pack, so that the heat generated by the battery pack is less than or equal to the heat dissipated by the battery pack before the battery pack temperature reaches the target temperature threshold. Among them, the target temperature threshold is slightly less than the temperature value corresponding to the second level of battery overtemperature. For example, the temperature value corresponding to the second level of battery overtemperature is 54 degrees, and the target temperature threshold is 52 degrees.

[0073] In one embodiment, the step of limiting the operating power of the battery pack according to the battery pack temperature may include:

[0074] According to the battery pack temperature, searching in a preset temperature-power relationship table to determine the target power corresponding to the battery pack temperature; the temperature-power relationship table includes the target battery pack temperature and the target power corresponding to the target battery pack temperature;

[0075] The operation of the battery pack is controlled based on the target power corresponding to the temperature of the battery pack.

[0076] It is necessary to pre-build a temperature-power relationship table for a hybrid vehicle. In this embodiment, an extreme heat test condition is built for a hybrid vehicle to perform a calibration test on a battery pack of the hybrid vehicle.

[0077] The extremely hot test condition needs to determine the target ambient temperature, the initial battery temperature, the operating parameters of the cooling water, and the battery test power during the test. It should be noted that the extremely hot test condition refers to the extreme situation that is most conducive to the heat generation of the battery pack in actual driving. For example, the target ambient temperature can be set to 45 degrees, the initial battery temperature is 45 degrees, and the operating parameters of the cooling water are a cooling water inlet temperature of 20 degrees and a flow rate of 15L / min (the cooling water operating parameters of different hybrid vehicles are different, and this is just an example). The battery test power is the power of the battery pack when the engine intervenes in the operation (at this time, the battery pack power is low, and under the same operating power, the voltage is low, the current is large, and the heat generation is large). For example, the battery test power is 20%.

[0078] Under the extremely hot test condition, the battery pack is repeatedly charged with a preset power for a preset time and discharged with a preset power for a preset time; for example, a cycle test of charging at a constant power for 10 seconds and discharging for 10 seconds is performed.

[0079] Then adjust the rated power until the battery pack temperature does not change for a long period of time (for example, one hour), that is, the heat generated by the battery pack is equal to the heat dissipated by the battery pack. At this time, the adjusted rated power is the second power corresponding to the target temperature threshold. In other words, in this extreme case, if the battery pack is at the target temperature threshold, as long as the operating power of the battery pack is limited to the second power, the battery pack will definitely not heat up, and it is likely to cool down.

[0080] Then, the temperature-power relationship table is constructed according to the target temperature threshold and the second power corresponding to the target temperature threshold, wherein the value range of the target battery pack temperature in the temperature-power relationship is determined by the initial temperature threshold and the target temperature threshold, and the value range of the target power in the temperature-power relationship is determined by the first power and the second power, wherein the second power is less than the first power, and the target temperature threshold is greater than the initial temperature threshold.

[0081] It should be explained that in order to ensure the smoothness of the battery pack power limit, this embodiment starts from the target temperature threshold of 52 degrees, and reverses the power reduction by 10kw / degree-20kw / degree to obtain the first power corresponding to the initial temperature threshold. It should be noted that the temperature corresponding power in the temperature power relationship table should be more than 70% of the power map table to ensure the smoothness of the user's power reduction.

[0082] For example, if the discharge power corresponding to the existing continuous discharge power map of the battery pack is 50 degrees, 70kw; 51 degrees, 60kw; 52 degrees, 50kw; 53 degrees, 40kw, then the target power corresponding to the battery pack at 52 degrees after power limitation is 30kw, and the target power corresponding to 51 degrees is 40kw, and the target power corresponding to 50 degrees is 50kw. The target power corresponding to 50 degrees is still within the range of 70% after the power reduction compared to the "50 degrees, 70kw" corresponding to the power map, and the strategy is qualified. The target power corresponding to 52 degrees or 51 degrees is not within the range of 70% after the power reduction compared to the power map, and needs to be increased.

[0083] In summary, the embodiment of this specification provides a battery temperature control method, which obtains the battery pack temperature; determines whether the hybrid vehicle is in an intense driving condition according to the battery pack temperature; if the hybrid vehicle is in the intense driving condition, obtains the operating power of the battery pack; if the operating power of the battery pack is greater than the first power, limits the operating power of the battery pack according to the battery pack temperature, so that before the battery pack temperature reaches the target temperature threshold, the heat generated by the battery pack is less than or equal to the heat dissipated by the battery pack. In this way, the hybrid vehicle can effectively avoid over-temperature runaway of the battery pack under intense driving conditions, while also taking into account the cooling of the passenger compartment to improve driving safety and comfort.

[0084] Based on the same inventive concept, combined Figure 2 As shown, an embodiment of the present invention further provides a battery temperature control device, comprising:

[0085] A first acquisition module is used to acquire the battery pack temperature;

[0086] A judgment module, used for judging whether the hybrid vehicle is in an intense driving condition according to the temperature of the battery pack;

[0087] A second acquisition module, configured to acquire the operating power of the battery pack if the hybrid vehicle is in the intense driving condition;

[0088] A control module is used to limit the operating power of the battery pack according to the battery pack temperature if the operating power of the battery pack is greater than a first power, so that the heat generated by the battery pack is less than or equal to the heat dissipated by the battery pack before the battery pack temperature reaches a target temperature threshold.

[0089] Optionally, the judgment module is also used to:

[0090] comparing the battery pack temperature to an initial temperature threshold;

[0091] If the battery pack temperature reaches the initial temperature threshold, the hybrid vehicle is in an intense driving condition;

[0092] If the battery pack temperature does not reach the initial temperature threshold, the hybrid vehicle is not in an intense driving condition.

[0093] Optionally, the judgment module is also used to:

[0094] Acquiring an energy over-temperature threshold of the hybrid vehicle, where the energy over-temperature threshold is a temperature value at which the hybrid vehicle determines that all air conditioning cooling capacity is used for cooling the battery pack;

[0095] The initial temperature threshold is determined according to the energy over-temperature threshold.

[0096] Optionally, the initial temperature threshold is less than or equal to the energy over-temperature threshold.

[0097] Optionally, the control module is further configured to:

[0098] According to the battery pack temperature, searching in a preset temperature-power relationship table to determine the target power corresponding to the battery pack temperature; the temperature-power relationship table includes the target battery pack temperature and the target power corresponding to the target battery pack temperature;

[0099] The operation of the battery pack is controlled based on the target power corresponding to the temperature of the battery pack.

[0100] Optionally, the control module is further configured to:

[0101] Constructing an extreme heat test condition for testing the hybrid vehicle;

[0102] Under the extreme heat test condition, repeatedly charging the battery pack with a preset time period at a rated power and discharging the battery pack with a preset time period at a rated power;

[0103] Adjusting the calibrated power until the heat generated by the battery pack is equal to the heat dissipated by the battery pack, thereby obtaining a second power corresponding to the target temperature threshold;

[0104] The temperature-power relationship table is constructed based on the target temperature threshold and the second power corresponding to the target temperature threshold, wherein the value range of the target battery pack temperature in the temperature-power relationship is determined by the initial temperature threshold and the target temperature threshold, and the value range of the target power in the temperature-power relationship is determined by the first power and the second power, wherein the second power is less than the first power, and the target temperature threshold is greater than the initial temperature threshold.

[0105] Optionally, the control module is further configured to:

[0106] Determining a battery test power according to the battery pack power when the engine of the hybrid vehicle is in operation;

[0107] Set the target ambient temperature, battery initial temperature, and cooling water operating parameters;

[0108] The extreme heat test condition is determined according to the battery test power, the target ambient temperature, the battery initial temperature and the operating parameters of the cooling water.

[0109] In summary, the battery temperature control device provided in the embodiment of this specification obtains the battery pack temperature; determines whether the hybrid vehicle is in an intense driving condition according to the battery pack temperature; if the hybrid vehicle is in the intense driving condition, obtains the operating power of the battery pack; if the operating power of the battery pack is greater than the first power, limits the operating power of the battery pack according to the battery pack temperature, so that before the battery pack temperature reaches the target temperature threshold, the heat generated by the battery pack is less than or equal to the heat dissipated by the battery pack. In this way, the hybrid vehicle can effectively avoid over-temperature runaway of the battery pack under intense driving conditions, while also taking into account the cooling of the passenger compartment to improve driving safety and comfort.

[0110] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the battery temperature control device described above can refer to the corresponding process in the aforementioned method, and will not be described in detail here.

[0111] Based on the same inventive concept, an embodiment of the present invention also provides a controller, which includes a battery temperature control device, a memory, a processor and a communication unit. The memory stores machine-readable instructions executable by the processor. When the controller is running, the processor and the memory communicate through a bus, the processor executes the machine-readable instructions, and executes the battery temperature control method.

[0112] The memory, processor and communication unit are electrically connected to each other directly or indirectly to achieve signal transmission or interaction. For example, these elements can be electrically connected to each other through one or more communication buses or signal lines. The battery temperature control device includes at least one software function module that can be stored in the memory in the form of software or firmware. The processor is used to execute the executable module stored in the memory (such as the software function module or computer program included in the battery temperature control device).

[0113] Among them, the memory can be, but is not limited to, random access memory (Random Access Memory, RAM), read-only memory (Read On ly Memory, ROM), programmable read-only memory (Programmable Read-Only Memory, PROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable read-only memory (Electrical Erasable Programmable Read-Only Memory, EEPROM), etc.

[0114] In some embodiments, the processor is used to perform one or more functions described in this embodiment. In some embodiments, the processor may include one or more processing cores (eg, a single-core processor (S) or a multi-core processor (S)).

[0115] In this embodiment, the memory is used to store the program, and the processor is used to execute the program after receiving the execution instruction. The process definition method disclosed in any implementation of this embodiment can be applied to the processor, or implemented by the processor.

[0116] The communication unit is used to establish a communication connection between the controller and other devices through the network, and to send and receive data through the network.

[0117] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the controller described above can refer to the corresponding process in the aforementioned method, and will not be elaborated here.

[0118] Based on the same inventive concept, an embodiment of the present invention further provides a vehicle, including a vehicle body and a controller installed in the vehicle body, wherein the controller is used to implement the aforementioned battery temperature control method.

[0119] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the controller of the vehicle described above can refer to the corresponding process in the aforementioned method, and will not be elaborated here.

[0120] The above are only various embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A battery temperature control method, characterized in that: Applied to hybrid vehicles; The method comprises: Get the battery pack temperature; determining, based on the battery pack temperature, whether the hybrid vehicle is in an intense driving condition; If the hybrid vehicle is in the intense driving condition, obtaining the operating power of the battery pack; If the operating power of the battery pack is greater than the first power, the operating power of the battery pack is limited according to the battery pack temperature so that the heat generated by the battery pack is less than or equal to the heat dissipated by the battery pack before the battery pack temperature reaches a target temperature threshold.

2. The method according to claim 1, characterized in that The determining, based on the battery pack temperature, whether the hybrid vehicle is in an intense driving condition includes: comparing the battery pack temperature to an initial temperature threshold; If the battery pack temperature reaches the initial temperature threshold, the hybrid vehicle is in an intense driving condition; If the battery pack temperature does not reach the initial temperature threshold, the hybrid vehicle is not in an intense driving condition.

3. The method according to claim 2, characterized in that Before the step of comparing the battery pack temperature with the initial temperature threshold, the method further includes: Obtaining an energy over-temperature threshold of the hybrid vehicle; The initial temperature threshold is determined according to the energy over-temperature threshold.

4. The method according to claim 3, characterized in that: The initial temperature threshold is less than or equal to the energy over-temperature threshold.

5. The method according to claim 1, characterized in that If the operating power of the battery pack is greater than the first power, limiting the operating power of the battery pack according to the temperature of the battery pack includes: According to the battery pack temperature, searching in a preset temperature-power relationship table to determine the target power corresponding to the battery pack temperature; the temperature-power relationship table includes the target battery pack temperature and the target power corresponding to the target battery pack temperature; The operation of the battery pack is controlled based on the target power corresponding to the temperature of the battery pack.

6. The method according to claim 5, characterized in that The steps of constructing the temperature-power relationship table include: Constructing an extreme heat test condition for testing the hybrid vehicle; Under the extreme heat test condition, repeatedly charging the battery pack with a preset time period at a rated power and discharging the battery pack with a preset time period at a rated power; Adjusting the calibrated power until the heat generated by the battery pack is equal to the heat dissipated by the battery pack, thereby obtaining a second power corresponding to the target temperature threshold; The temperature-power relationship table is constructed based on the target temperature threshold and the second power corresponding to the target temperature threshold, wherein the value range of the target battery pack temperature in the temperature-power relationship is determined by the initial temperature threshold and the target temperature threshold, and the value range of the target power in the temperature-power relationship is determined by the first power and the second power, wherein the second power is less than the first power, and the target temperature threshold is greater than the initial temperature threshold.

7. The method according to claim 1, characterized in that The construction of the extreme heat test condition includes: Determining a battery test power according to the battery pack power when the engine of the hybrid vehicle is in operation; Set the target ambient temperature, battery initial temperature, and cooling water operating parameters; The extreme heat test condition is determined according to the battery test power, the target ambient temperature, the battery initial temperature and the operating parameters of the cooling water.

8. A battery temperature control device, characterized in that: include: A first acquisition module is used to acquire the battery pack temperature; A judgment module, used for judging whether the hybrid vehicle is in an intense driving condition according to the temperature of the battery pack; A second acquisition module, configured to acquire the operating power of the battery pack if the hybrid vehicle is in the intense driving condition; A control module is used to limit the operating power of the battery pack according to the battery pack temperature if the operating power of the battery pack is greater than a first power, so that the heat generated by the battery pack is less than or equal to the heat dissipated by the battery pack before the battery pack temperature reaches a target temperature threshold.

9. A controller, characterized in that: The controller includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the battery temperature control method described in any one of claims 1 to 7 when executing the computer program.

10. A vehicle, characterized in that: The vehicle comprises a vehicle body and a controller installed in the vehicle body, wherein the controller executes the battery temperature control method according to any one of claims 1-7.

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