Battery heating control method, control unit, and storage medium

Abstract

The application provides a battery heating control method, a control unit and a storage medium. The method comprises the following steps: determining the power ratio of internal heating and external heating according to the minimum temperature of the battery; heating the battery by the internal heating and the external heating according to the power ratio; and balancing the heating efficiency and the energy consumption by dynamically adjusting the power ratio of the internal heating and the external heating of the battery based on the battery temperature and the performance characteristics of different temperature zones.

Description

Technical Field

[0001] This application relates to the field of power batteries, and in particular to a battery heating control method, a control unit, and a storage medium. Background Technology

[0002] With the rapid development of new energy vehicles, the performance and safety of power batteries have become key factors restricting their application. In low-temperature environments, the electrochemical activity of power batteries decreases, leading to capacity decay, limited power output, and even potential safety hazards such as lithium plating, severely impacting vehicle range and user experience.

[0003] Therefore, how to heat the power battery quickly and efficiently to maintain its operating temperature within a reasonable range has become a technical problem that the industry urgently needs to solve. Summary of the Invention

[0004] This invention provides a battery heating control method, a control unit, and a storage medium. The method achieves a balance between heating efficiency and energy consumption by dynamically adjusting the power ratio of internal heating and external heating.

[0005] In a first aspect, the present invention provides a battery heating control method, comprising:

[0006] Determine the power ratio of internal heating to external heating based on the battery's lowest temperature;

[0007] The battery is heated using a combination of internal and external heating based on its power ratio.

[0008] Optionally, the power ratio of internal heating to external heating can be determined based on the battery's lowest temperature, including:

[0009] Based on the correspondence between the minimum temperature and the temperature threshold, the power ratio of internal heating to external heating is determined.

[0010] Optionally, based on the correspondence between the minimum temperature and the temperature threshold, the power ratio of internal heating to external heating is determined, including:

[0011] When the minimum temperature is lower than the first temperature threshold, the power ratio of internal heating to external heating is determined to be the first ratio; the first ratio is greater than or equal to 1:1; the first temperature threshold is the low temperature critical point.

[0012] Optionally, the first temperature threshold ranges from -10°C to 0°C; and / or, the first ratio ranges from 1:1 to 3:1.

[0013] Optionally, the setting of the first temperature threshold is related to the ambient temperature, and the method further includes:

[0014] When the ambient temperature is lower than the preset temperature, the first temperature threshold is reduced and the power ratio of internal heating to external heating is increased.

[0015] Optionally, based on the correspondence between the minimum temperature and the temperature threshold, the power ratio of internal heating to external heating is determined, including:

[0016] When the minimum temperature is greater than or equal to the first temperature threshold and less than the second temperature threshold, the power ratio of internal heating to external heating is determined to be the second ratio; the second ratio is less than or equal to 1:1; the second temperature threshold is the upper limit temperature at which heating is terminated.

[0017] Optionally, the range of the first temperature threshold is -10°C to 0°C; the range of the second temperature threshold is 10°C to 20°C; and / or, the range of the second ratio is 1:1 to 1:5.

[0018] And / or, if the battery is in a discharge scenario, the power ratio of internal heating to external heating is a third ratio; the third ratio is less than the second ratio.

[0019] Optionally, the method also includes:

[0020] When the minimum temperature is greater than or equal to the second temperature threshold, both internal and external heating are turned off; the second temperature threshold is the upper limit temperature at which heating is terminated.

[0021] In a second aspect, the present invention provides a control unit, comprising: at least one processor and a memory;

[0022] The memory stores the instructions that the computer executes;

[0023] At least one processor executes computer execution instructions stored in memory, causing at least one processor to perform the method as described in any of the first aspects.

[0024] Thirdly, the present invention provides a battery management system, including: a control unit as described in the second aspect.

[0025] Fourthly, the present invention provides a battery device, comprising: a control unit as described in the second aspect, or a battery management system as described in the third aspect, and a battery, the battery device further comprising:

[0026] A sensor module is used to detect the lowest temperature of the battery;

[0027] An internal heating module is used to control the heating of the battery cells under the control of the control unit;

[0028] An external heating module is used to heat the battery under the control of the control unit.

[0029] Optionally, the internal heating module consists of a circuit structure;

[0030] The external heating module includes at least one of a direct heating device, a liquid heating device, or a heating film.

[0031] Fifthly, the present invention provides an electrical device, comprising: a control unit as described in the second aspect; or a battery management system as described in the third aspect; or a battery device as described in the fourth aspect.

[0032] In a sixth aspect, the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the method of any of the first aspects.

[0033] In a seventh aspect, the present invention provides a computer program product comprising a computer program that, when executed by a processor, implements the method as described in any of the first aspects.

[0034] The present invention provides a battery heating control method, a control unit, and a storage medium. The method includes: determining the power ratio of internal heating and external heating based on the lowest temperature of the battery; heating the battery by combining internal heating and external heating according to the power ratio; and achieving a balance between heating efficiency and energy consumption by dynamically adjusting the power ratio of internal heating and external heating based on the battery temperature and performance characteristics of different temperature zones. Attached Figure Description

[0035] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0036] Figure 1 This is a schematic flowchart of a battery heating control method provided in an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of a temperature rise curve for internal heating provided in an embodiment of the present invention;

[0038] Figure 3 A schematic diagram of a temperature rise curve for external heating provided in an embodiment of the present invention;

[0039] Figure 4 A schematic flowchart of another battery heating control method provided in an embodiment of the present invention;

[0040] Figure 5 A schematic diagram of a temperature rise curve for internal and external coupled heating provided in an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the structure of a battery heating control device provided in an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of the hardware structure of a control unit provided in an embodiment of the present invention.

[0043] The accompanying drawings have illustrated specific embodiments of the invention, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0044] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention.

[0045] In this document, it should be understood that the terminology used is for convenience of understanding only and does not imply any limitation on its meaning. Furthermore, any number of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0046] In related technologies, when batteries need to be heated, a single heating mode is usually used, which leads to problems of insufficient heating efficiency and excessive energy consumption.

[0047] Based on the above problems, it is considered that the heating method was not dynamically adjusted according to the real-time temperature of the battery, resulting in insufficient heating efficiency and serious energy waste.

[0048] Figure 1 This is a flowchart illustrating a battery heating control method provided in an embodiment of the present invention; optionally, when it is necessary to charge or discharge the battery, the following method can be executed by a control unit. For example, in the scenario of heating an electric vehicle battery during charging and discharging in a low-temperature environment. Figure 1 As shown, the method includes:

[0049] Step S101: Determine the power ratio of internal heating to external heating based on the lowest temperature of the battery.

[0050] When battery heating is required, the battery's minimum temperature can be monitored in real time. Here, the minimum battery temperature refers to the temperature of each individual cell within the battery, calculated to determine the lowest possible temperature.

[0051] Optionally, the battery temperature can be collected in real time using an NTC (Negative Temperature Coefficient Thermistor) temperature sensor arranged on the surface of the cell, and the lowest temperature can be obtained.

[0052] Once the minimum temperature is determined, the temperature range to which the minimum temperature belongs can be identified, and the ratio of internal heating power to external heating power that should be applied at the current time can be determined accordingly.

[0053] Optionally, the power ratio of internal heating to external heating is a dynamic control parameter that defines the distribution relationship between the heat power generated by internal heating and the heat power generated by external heating at any given time.

[0054] During the heating process, the minimum temperature is determined in real time, and when the minimum temperature changes, the power ratio of internal heating to external heating is adjusted accordingly.

[0055] Step S102: Heat the battery using both internal and external heating according to the power ratio.

[0056] The control unit generates corresponding control commands based on the determined power ratio, driving the internal heating module to apply an alternating current of a specific frequency and amplitude to stimulate heat generation within the battery cell, and driving the external heating module to perform heating. The internal heating module can be a circuit structure used to control whether to output current to the battery cell.

[0057] Optionally, internal heating and external heating can be applied to the battery cell simultaneously. Internal heating rapidly raises the core temperature from inside the cell, while external heating transfers heat from the battery surface, surrounding medium, or between individual cells, improving the uniformity of temperature distribution among the cells.

[0058] Optionally, internal heating can be self-heating, while external heating can be based on direct heating (including single-plate and double-plate), liquid heating, and heating film (a thin sheet-like electric heating element).

[0059] Figure 2 A schematic diagram of a temperature rise curve for internal heating provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of a temperature rise curve for external heating provided in an embodiment of the present invention; see reference. Figure 2 and Figure 3 Internal heating utilizes the internal resistance of the battery cell itself. At low temperatures, the cell's internal resistance is high, allowing it to heat up quickly. However, due to differences in internal resistance among different cells, using internal heating alone can result in significant temperature differences. Figure 2 As shown, the maximum temperature difference is 16℃, and the heating rate slows down as the temperature increases. External heating acts on the surface of all cells, which can heat all cells more evenly, but the heating rate is slower at low temperatures when using external heating alone. Figure 3 As shown, the temperature rise rate from -20°C to 0°C is only 0.35°C / min.

[0060] Based on the above characteristics, by dynamically matching the ratio of internal and external heating power, the heating strategy can combine the performance characteristics of different temperature zones (such as the rapid heating capability of prioritizing internal heating in the low temperature zone and the efficient temperature control capability of prioritizing external heating in the medium and high temperature zone), thereby reducing the temperature difference and energy consumption while increasing the temperature rise rate.

[0061] The present invention provides a battery heating control method, which includes: determining the power ratio of internal heating and external heating based on the lowest temperature of the battery; heating the battery by combining internal heating and external heating according to the power ratio; and achieving a balance between heating efficiency and energy consumption by dynamically adjusting the power ratio of internal heating and external heating based on the battery temperature and performance characteristics of different temperature zones.

[0062] Optionally, the power ratio of internal heating to external heating can be determined based on the battery's lowest temperature, including:

[0063] Based on the correspondence between the minimum temperature and the temperature threshold, the power ratio of internal heating to external heating is determined.

[0064] When determining the power ratio of internal heating to external heating, a temperature threshold can be preset. For example, a first temperature threshold and a second temperature threshold can be set to determine the temperature range in which the lowest temperature falls, thereby setting the corresponding power ratio of internal heating to external heating.

[0065] Optionally, the first temperature threshold is lower than the second temperature threshold. Optionally, the first and second temperature thresholds can be dynamically adjusted based on the battery's chemistry, heating technology, or operating environment.

[0066] By setting a temperature threshold, the temperature range in which the lowest temperature is located can be accurately determined, so as to control the power ratio of internal heating and external heating accordingly.

[0067] Optionally, based on the correspondence between the minimum temperature and the temperature threshold, the power ratio of internal heating to external heating is determined, including:

[0068] When the minimum temperature is lower than the first temperature threshold, the power ratio of internal heating to external heating is determined to be the first ratio; the first ratio is greater than or equal to 1:1; the first temperature threshold is the low temperature critical point.

[0069] Optionally, the first ratio is a specific power ratio value, representing the ratio of internal heating power to external heating power at this low-temperature state. Optionally, the first ratio is greater than 1:1, meaning that in this stage, the power allocated to internal heating is higher than the power allocated to external heating. For example, if the first ratio is set to 1.5:1, it means that the internal heating power is 1.5 times the external heating power; if it is set to 3:1, it means that the internal heating power is 3 times the external heating power. The above ratio settings aim to make internal heating dominant, so as to make full use of its characteristics of direct and rapid heat generation from inside the battery, overcome the bottleneck of low external heat transfer efficiency in low-temperature environments, and achieve rapid temperature rise in the initial stage.

[0070] In the above process, external heating works synchronously as an auxiliary heat source. Its main function is not to provide core heating power, but to help reduce the local temperature difference between individual cells.

[0071] Optionally, the internal heating is self-heating, which involves applying a current of a certain frequency and amplitude to the battery and utilizing the energy loss generated by the battery's own impedance to generate heat, thereby rapidly raising the temperature and improving the battery's low-temperature performance.

[0072] Optionally, the external heating is direct heating (double cold plate), which uses the double cold plate structure to transfer heat through an external heat source. The heating rate increases with the temperature, making it suitable for temperature control in the medium and high temperature range.

[0073] Optionally, the first temperature threshold ranges from -10°C to 0°C; and / or, the first ratio ranges from 1:1 to 3:1.

[0074] For example, the first temperature threshold ranges from -10°C to 0°C. When the first temperature threshold is 0°C, the coordinated mode of internal heating and external heating is activated when the lowest temperature is below 0°C, with a power ratio of 1:1 to 3:1. Internal heating is used to quickly raise the temperature, while external heating helps to reduce the local temperature difference.

[0075] Optionally, the first temperature threshold can be -10℃, -8℃, -5℃, -3℃, 0℃, etc. Optionally, the first ratio can be 1:1, 2:1, 3:1, etc.

[0076] By setting a first temperature threshold range and a first ratio range, internal heating can be prioritized in the low-temperature range, allowing heat to act directly on the battery cell, while reducing the use of external heating with low heat transfer efficiency and reducing energy waste.

[0077] Optionally, a first temperature threshold is used to trigger rapid heating.

[0078] Optionally, the heating temperature threshold and the power ratio of different heating methods in the embodiments of the present invention can be flexibly adjusted according to actual needs.

[0079] Optionally, the setting of the first temperature threshold is related to the ambient temperature, and the method further includes:

[0080] When the ambient temperature is lower than the preset temperature, the first temperature threshold is reduced and the power ratio of internal heating to external heating is increased.

[0081] Optionally, in extremely cold regions, the first temperature threshold can be lowered to increase the internal heating power and enhance the heating intensity of the internal heating during low-temperature periods.

[0082] In extremely cold regions, the initial temperature of the power battery is even lower, its internal chemical reaction activity is severely suppressed, and its internal resistance increases sharply, making it impossible for conventional heating strategies to preheat the battery to a safe and usable state within an acceptable time.

[0083] Compared to the first temperature threshold set in a normal temperature region (e.g., -10℃ to 0℃), the first temperature threshold here is adjusted to a lower value (e.g., -15℃ to -10℃).

[0084] Correspondingly, increasing the power ratio of internal heating to external heating is a corresponding measure taken in conjunction with the reduction of the first temperature threshold, for example, increasing the power ratio from the original 1.5:1 (internal:external) to 3:1.

[0085] By using the above methods, the heating capacity in the initial low-temperature range can be enhanced when the ambient temperature is low, so that the battery temperature can be raised quickly and effectively, thereby overcoming the challenges brought by extreme cold conditions and ensuring the vehicle's starting and operating capabilities.

[0086] Optionally, based on the correspondence between the minimum temperature and the temperature threshold, the power ratio of internal heating to external heating is determined, including:

[0087] When the minimum temperature is greater than or equal to the first temperature threshold and less than the second temperature threshold, the power ratio of internal heating to external heating is determined to be the second ratio; the second ratio is less than or equal to 1:1; the second temperature threshold is the upper limit temperature at which heating is terminated.

[0088] Optionally, the second ratio is another specific power ratio value, which represents the ratio of internal heating power to external heating power during this stage. In this embodiment, the second ratio is less than 1:1, which means that during this stage, the power allocated to internal heating is lower than the power allocated to external heating.

[0089] For example, if the second ratio is set to 0.5:1, it means that the internal heating power is only half of the external heating power; if it is set to 1:5, it means that the internal heating power is one-fifth of the external heating power. These ratio settings signify a switch from internal to external heating as the dominant heat source. This is because as the battery temperature rises, the efficiency of internal heating relatively decreases, and continuous high-current internal excitation may have a cumulative impact on the battery's health. External heating (such as liquid heating or direct heating plates) has high heat transfer efficiency and fast response in this temperature range, and it is easier to achieve a uniform temperature distribution within the battery pack.

[0090] Optionally, the first temperature threshold ranges from -10°C to 0°C; the second temperature threshold ranges from 10°C to 20°C; and / or the second ratio ranges from 1:1 to 1:5.

[0091] Optionally, the first temperature threshold ranges from -10℃ to 0℃, and the second temperature threshold ranges from 10℃ to 20℃.

[0092] Optionally, when the first temperature threshold is 0℃ and the second temperature threshold is 20℃, when the lowest temperature is between 0℃ and 20℃, the power ratio of internal heating to external heating is adjusted to x2:y2, and the range of x2:y2 is 1:1 to 1:5.

[0093] By reducing internal heating power to decrease energy loss, while increasing external power, the high efficiency of external power in the medium and high temperature range is utilized to rapidly raise the temperature and further reduce the temperature difference.

[0094] Optionally, the second temperature threshold can be 10℃, 13℃, 15℃, 18℃, 20℃, etc. Optionally, the second ratio can be 1:1, 1:3, 1:5, etc.

[0095] By setting a second temperature threshold range and a second ratio range, the second temperature threshold range is the pre-range of the battery's optimal operating temperature. In this temperature range, the internal resistance of the cell has been significantly reduced, and the heat transfer efficiency of external heating is high. At this time, external heating can be dominant, which can save more energy.

[0096] Optionally, if the battery is in a discharge scenario, the power ratio of internal heating to external heating is a third ratio; the third ratio is less than the second ratio.

[0097] Optionally, the discharge scenario is a high-power demand scenario. That is, when discharging through the battery, if the minimum temperature is greater than or equal to the first temperature threshold and less than the second temperature threshold, the power ratio of internal heating to external heating can be determined as a third ratio, which is less than the second ratio.

[0098] Optionally, the discharge scenario can be: a vehicle in motion, and / or a vehicle-mounted high-power electrical equipment in operation.

[0099] In other words, in the above scenario, the external heating power can be increased and the internal heating power can be reduced. This is because the internal heating method involves applying current to the battery, while in the discharge scenario, it is desirable to use as much electrical energy as possible for vehicle operation. Therefore, the internal heating power can be reduced.

[0100] Optionally, the method also includes:

[0101] When the minimum temperature is greater than or equal to the second temperature threshold, both internal and external heating are turned off; the second temperature threshold is the upper limit temperature at which heating is terminated.

[0102] When the minimum temperature is greater than or equal to the second temperature threshold, the overall temperature of the battery pack is close to its optimal operating range (20-30℃), ensuring efficient charging and discharging. At this point, internal and external heating can be turned off. Optionally, the second temperature threshold is used to prevent overheating.

[0103] For example, when the second temperature threshold is 20°C, all heating devices are turned off when the minimum temperature reaches 20°C to avoid redundant energy consumption.

[0104] Figure 4 This is a schematic flowchart of another battery heating control method provided in an embodiment of the present invention; as shown below. Figure 4 As shown, the specific steps include:

[0105] a) Set heating temperature threshold 1 and heating temperature threshold 2, wherein heating temperature threshold 1 is lower than heating temperature threshold 2;

[0106] b) Monitor the minimum temperature of the power battery in real time during the heating process;

[0107] c) When the monitored minimum temperature is lower than the heating temperature threshold 1, turn on the internal heating and external heating, and set the power ratio of the two to x1:y1;

[0108] d) When the monitored minimum temperature is higher than or equal to the heating temperature threshold 1 and lower than the heating temperature threshold 2, adjust the power ratio of internal heating and external heating to x2:y2;

[0109] e) When the monitored minimum temperature is higher than or equal to the heating temperature threshold 2, turn off the internal heating and external heating.

[0110] Optionally, the power ratio x1:y1 can range from 1:1 to 3:1, and the power ratio x2:y2 can range from 1:1 to 1:5.

[0111] Figure 5This is a schematic diagram of a temperature rise curve for internal and external coupled heating provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the temperature rise curve of a battery with only internal heating activated. Figure 3 A schematic diagram of the temperature rise curve of the battery with only external heating on.

[0112] Specifically, the temperature rise rate and maximum temperature difference are shown in Table 1. It can be seen that when only internal heating is used, there is a relatively fast temperature rise rate below 0℃. As the temperature increases, the heating rate decreases, and the maximum temperature difference reaches 16℃ during the entire heating process. When only external heating is used, the temperature rise rate is smaller below 0℃, but larger above 0℃, and the maximum temperature difference during the entire heating process is 9℃. In this embodiment, the coupled heating strategy achieves a temperature rise rate of 1.68℃ / min in the -20℃ to 0℃ range, which is 24% higher than internal heating alone (1.35℃ / min) and 380% higher than external heating alone (0.35℃ / min). In the 0℃ to 20℃ range, the temperature rise rate reaches 2.86℃ / min, which is 138% higher than internal heating alone and 102% higher than external heating alone. Simultaneously, the maximum temperature difference is reduced by 25% compared to internal heating alone.

[0113] Table 1

[0114]

[0115] By employing different power adjustment strategies for different temperature zones, the synergistic optimization of battery heating efficiency, energy consumption control, and temperature uniformity is achieved, significantly improving low-temperature heating efficiency, reducing energy consumption throughout the entire life cycle, effectively suppressing battery temperature differences, and enhancing system safety and adaptability. This breaks through the technical bottlenecks of traditional heating strategies, which are characterized by low efficiency, high energy consumption, and large temperature differences.

[0116] Figure 6 This is a schematic diagram of a battery heating control device provided in an embodiment of the present invention. The device includes:

[0117] The determination module 601 is used to determine the power ratio of internal heating to external heating based on the lowest temperature of the battery.

[0118] The control module 602 is used to heat the battery by combining internal heating and external heating according to the power ratio.

[0119] Optionally, when determining the power ratio of internal heating to external heating based on the lowest temperature of the battery, the determining module 601 is specifically used for:

[0120] Based on the correspondence between the minimum temperature and the temperature threshold, the power ratio of internal heating to external heating is determined.

[0121] Optionally, when determining the power ratio of internal heating to external heating based on the correspondence between the minimum temperature and the temperature threshold, the determining module 601 is specifically used for:

[0122] When the minimum temperature is lower than the first temperature threshold, the power ratio of internal heating to external heating is determined to be the first ratio; the first ratio is greater than or equal to 1:1; the first temperature threshold is the low temperature critical point.

[0123] Optionally, the first temperature threshold ranges from -10°C to 0°C; and / or, the first ratio ranges from 1:1 to 3:1.

[0124] Optionally, the setting of the first temperature threshold is related to the ambient temperature, and the determining module 601 is also used for:

[0125] When the ambient temperature is lower than the preset temperature, the first temperature threshold is reduced and the power ratio of internal heating to external heating is increased.

[0126] Optionally, when determining the power ratio of internal heating to external heating based on the correspondence between the minimum temperature and the temperature threshold, the determining module 601 is specifically used for:

[0127] When the minimum temperature is greater than or equal to the first temperature threshold and less than the second temperature threshold, the power ratio of internal heating to external heating is determined to be the second ratio; the second ratio is less than or equal to 1:1; the second temperature threshold is the upper limit temperature at which heating is terminated.

[0128] Optionally, the first temperature threshold ranges from -10°C to 0°C; the second temperature threshold ranges from 10°C to 20°C; and / or the second ratio ranges from 1:1 to 1:5.

[0129] And / or, if the battery is in a discharge scenario, the power ratio of internal heating to external heating is a third ratio; the third ratio is less than the second ratio.

[0130] Optionally, the device further includes: a processing module for:

[0131] When the minimum temperature is greater than or equal to the second temperature threshold, both internal and external heating are turned off; the second temperature threshold is the upper limit temperature at which heating is terminated.

[0132] The battery heating control device provided in this embodiment of the invention can achieve the above-mentioned... Figure 1 The battery heating control method shown in the embodiment has a similar implementation principle and technical effect, and will not be described again here.

[0133] Figure 7 This is a schematic diagram of the hardware structure of a control unit provided in an embodiment of the present invention, as shown below. Figure 7As shown, the present invention provides a control unit, including at least one processor 701 and a memory 702. The processor 701 and the memory 702 are connected via a bus 703.

[0134] In the specific implementation process, memory 702 stores instructions executed by the computer;

[0135] At least one processor 701 executes computer execution instructions stored in memory 702, causing at least one processor 701 to perform the method in the above method embodiment.

[0136] The specific implementation process of processor 701 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0137] In the above Figure 7 In the illustrated embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0138] The memory may include high-speed RAM, and may also include non-volatile storage (NVM), such as at least one disk storage.

[0139] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0140] This invention also provides a battery management system, including a control unit as described in the foregoing embodiments.

[0141] This invention also provides a battery device, characterized in that it includes: the control unit of the aforementioned embodiment, or the battery management system of the aforementioned embodiment, and a battery; the battery device further includes:

[0142] A sensor module is used to detect the lowest temperature of the battery;

[0143] An internal heating module is used to control the heating of the battery cells under the control of the control unit;

[0144] An external heating module is used to heat the battery under the control of the control unit.

[0145] Optionally, the internal heating module consists of a circuit structure;

[0146] The external heating module includes at least one of a direct heating device, a liquid heating device, or a heating film.

[0147] The internal heating module can be a circuit structure used to control whether to output current to the battery cell according to the control unit, so that the battery cell heats up by relying on its internal resistance.

[0148] External heating modules can be direct heating (single-plate and double-plate), liquid heating, and heating film (a thin sheet-like electric heating element), etc.

[0149] Optionally, the battery device can be a battery module, battery pack, chassis (such as a CTC integrated chassis, skateboard chassis, etc.). CTC is an abbreviation for Cell-to-Chassis.

[0150] This invention also provides an electrical device, including the control unit of the foregoing embodiment; or the battery management system of the foregoing embodiment; or the battery device of the foregoing embodiment.

[0151] Optionally, the electrical equipment can be vehicles, ferries, energy storage cabinets, aircraft, or computers.

[0152] This invention also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the method described in the above-described method embodiments.

[0153] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the method described in the above method embodiments.

[0154] The aforementioned computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0155] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0156] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0157] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0158] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods of the various embodiments of this application.

[0159] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A battery heating control method, characterized in that, include: Determine the power ratio of internal heating to external heating based on the battery's lowest temperature; The battery is heated by a combination of internal and external heating according to the power ratio.

2. The method according to claim 1, characterized in that, Based on the battery's lowest temperature, determine the power ratio between internal and external heating, including: Based on the correspondence between the minimum temperature and the temperature threshold, the power ratio of internal heating to external heating is determined.

3. The method according to claim 2, characterized in that, Based on the correspondence between the minimum temperature and the temperature threshold, the power ratio of internal heating to external heating is determined, including: When the minimum temperature is lower than the first temperature threshold, the power ratio of internal heating to external heating is determined to be the first ratio; the first ratio is greater than or equal to 1:1; the first temperature threshold is the low temperature critical point.

4. The method according to claim 3, characterized in that, The first temperature threshold ranges from -10°C to 0°C; and / or the first ratio ranges from 1:1 to 3:

1.

5. The method according to claim 3, characterized in that, The first temperature threshold is set according to the ambient temperature, and the method further includes: When the ambient temperature is lower than the preset temperature, the first temperature threshold is reduced and the power ratio of internal heating to external heating is increased.

6. The method according to claim 2, characterized in that, Based on the correspondence between the minimum temperature and the temperature threshold, the power ratio of internal heating to external heating is determined, including: When the minimum temperature is greater than or equal to the first temperature threshold and less than the second temperature threshold, the power ratio of internal heating to external heating is determined to be the second ratio; the second ratio is less than or equal to 1:1; the second temperature threshold is the upper limit temperature at which heating is terminated.

7. The method according to claim 6, characterized in that, The first temperature threshold ranges from -10°C to 0°C; the second temperature threshold ranges from 10°C to 20°C; and / or, the second ratio ranges from 1:1 to 1:

5. And / or, if the battery is in a discharge scenario, the power ratio of internal heating to external heating is a third ratio; the third ratio is less than the second ratio.

8. The method according to claim 2, characterized in that, The method further includes: When the minimum temperature is greater than or equal to the second temperature threshold, the internal heating and external heating are turned off; the second temperature threshold is the upper limit temperature at which heating is terminated.

9. A control unit, characterized in that, include: At least one processor and memory; The memory stores computer-executed instructions; The at least one processor executes computer execution instructions stored in the memory, causing the at least one processor to perform the method as described in any one of claims 1-8.

10. A battery management system, characterized in that, include: The control unit as described in claim 9.

11. A battery device, characterized in that, include: The control unit of claim 9, or the battery management system of claim 10, and the battery, wherein the battery device further comprises: A sensor module is used to detect the lowest temperature of the battery; An internal heating module is used to control the heating of the battery cells under the control of the control unit; An external heating module is used to heat the battery under the control of the control unit.

12. The battery device according to claim 11, characterized in that, The internal heating module is composed of a circuit structure; The external heating module includes at least one of a direct heating device, a liquid heating device, or a heating film.

13. An electrical appliance, characterized in that, include: The control unit as described in claim 9; Alternatively, the battery management system as described in claim 10; Alternatively, the battery device as described in claim 11 or 12.

14. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, implement the method as described in any one of claims 1-8.

15. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method as described in any one of claims 1-8.

Images