Lithium Battery Low-Temperature Charging Control Method, System, Computer Device and Storage Medium

Abstract

The present application relates to a low-temperature charging control method, device, computer device and storage medium for a lithium battery. The method includes: obtaining a first temperature of the lithium battery system and comparing the first temperature with a temperature threshold; when the first temperature is less than or equal to the temperature threshold, obtaining the rated output power of the charging device, the rated charging power and the rated heating power of the lithium battery system, and selecting a working mode according to the rated output power, the rated charging power and the rated heating power, wherein the working mode at least includes one of the following: heating mode, charging mode; obtaining the state of charge and the allowable charging power of the lithium battery system, determining a regulated temperature according to the state of charge and the allowable charging power, and correspondingly changing the working mode according to the regulated temperature. By using this method, various charging-related data can be combined and analyzed, and then a suitable working mode can be selected, improving the charging efficiency and charging safety of the lithium battery system in a low-temperature environment.

Description

Technical Field

[0001] The present application relates to the technical field of charging, and particularly to a low-temperature charging control method, system, computer device, and storage medium for lithium batteries. Background Art

[0002] As the temperature decreases, the kinetic characteristics of the graphite negative electrode further deteriorate. During the charging process of lithium batteries, the electrochemical polarization of the negative electrode is significantly intensified, and the precipitated metallic lithium is prone to form lithium dendrites, piercing through the separator and causing short circuit between the positive and negative electrodes, resulting in a series of lithium battery charging failures in low-temperature environments. Therefore, when charging lithium batteries in low-temperature environments, the lithium batteries are usually appropriately heated and a small current slow charging method is selected to ensure charging safety.

[0003] However, based on the current low-temperature charging methods, the relevant data referred to during charging is not comprehensive enough, and factors such as the charging capacity of the charging pile or the charging power of the battery are not fully considered, resulting in too long charging time, low charging efficiency, and even possible inability to charge in extreme cases. Summary of the Invention

[0004] Based on this, a low-temperature charging control method, system, computer device, and storage medium for lithium batteries are provided to solve the problem of low charging efficiency in the prior art in low-temperature environments.

[0005] On the one hand, a low-temperature charging control method for lithium batteries is provided, and the method includes:

[0006] Obtain the first temperature of the lithium battery system, and compare the first temperature with a temperature threshold;

[0007] When the first temperature is less than or equal to the temperature threshold, obtain the rated output power of the charging device, the rated charging power and the rated heating power of the lithium battery system, and select a working mode according to the rated output power, the rated charging power, and the rated heating power, where the working mode includes at least one of the following: heating mode, charging mode;

[0008] Obtain the state of charge and the allowable charging power of the lithium battery system, determine a regulated temperature according to the state of charge and the allowable charging power, and correspondingly change the working mode according to the regulated temperature.

[0009] In one embodiment, the comparison of the first temperature with the temperature threshold further includes:

[0010] When the first temperature is greater than the temperature threshold, obtain the state of charge, determine the allowable charging power according to the first temperature and the state of charge, and select the working mode according to the allowable charging power, the rated output power, and the rated charging power.

[0011] In one embodiment, the selection of the operating mode according to the rated output power, the rated charging power, and the rated heating power includes:

[0012] Compare the minimum value of the rated output power and the rated charging power to determine a heating power threshold including the minimum value, and compare the rated heating power with the heating power threshold;

[0013] If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0014] If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode.

[0015] In one embodiment, the selection of the operating mode according to the allowable charging power, the rated output power, and the rated charging power includes:

[0016] Compare the minimum value of the rated output power and the rated charging power to determine a heating power threshold including the minimum value, and compare the allowable charging power with the heating power threshold;

[0017] If the allowable charging power is greater than or equal to the heating power threshold, select the charging mode;

[0018] If the allowable charging power is less than the heating power threshold, compare the rated heating power with the heating power threshold;

[0019] If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0020] If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode.

[0021] In one embodiment, the corresponding change of the operating mode according to the regulated temperature includes:

[0022] If the heating mode is selected, determine the regulated temperature according to the state of charge and the allowable charging power. The regulated temperature includes the allowable charging temperature and the pause heating temperature, and obtain the real-time temperature of the lithium battery system;

[0023] When the real-time temperature reaches the allowable charging temperature, select the heating mode and the charging mode;

[0024] When the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode;

[0025] If the heating mode and the charging mode are selected, determine the pause heating temperature according to the state of charge and the allowable charging power, obtain the real-time temperature, and when the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode.

[0026] In one embodiment, the changing the working mode according to the regulated temperature includes:

[0027] When the allowable charging power is less than the heating power threshold, compare the rated heating power with the heating power threshold;

[0028] If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0029] Determine a regulated temperature according to the state of charge and the allowable charging power, where the regulated temperature includes an allowable charging temperature and a pause heating temperature, and obtain the real-time temperature of the lithium battery system;

[0030] When the real-time temperature reaches the allowable charging temperature, select the heating mode and the charging mode;

[0031] When the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode.

[0032] If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode;

[0033] Determine the pause heating temperature according to the state of charge and the allowable charging power, obtain the real-time temperature of the lithium battery system, and when the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode.

[0034] In one embodiment, after pausing the heating mode, further include:

[0035] Monitor a second temperature of the lithium battery system, and when the second temperature is lower than the regulated temperature, select the working mode according to the second temperature and the regulated temperature.

[0036] On the other hand, a lithium battery low-temperature charging control device is provided, and the device includes:

[0037] An analysis module, configured to obtain a first temperature of the lithium battery system and compare the first temperature with a temperature threshold;

[0038] A working module, configured to, when the first temperature is less than or equal to the temperature threshold, obtain the rated output power of the charging device, the rated charging power and the rated heating power of the lithium battery system, and select a working mode according to the rated output power, the rated charging power and the rated heating power, where the working mode includes at least one of the following: a heating mode, a charging mode;

[0039] A control module, configured to obtain the state of charge and the allowable charging power of the lithium battery system, determine a regulated temperature according to the state of charge and the allowable charging power, and change the working mode correspondingly according to the regulated temperature.

[0040] On the other hand, a computer device is provided, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the following steps are implemented:

[0041] Obtain the first temperature of the lithium battery system, and compare the first temperature with a temperature threshold;

[0042] When the first temperature is less than or equal to the temperature threshold, obtain the rated output power of the charging device, the rated charging power and the rated heating power of the lithium battery system, and select a working mode according to the rated output power, the rated charging power and the rated heating power, where the working mode includes at least one of the following: a heating mode, a charging mode;

[0043] Obtain the state of charge and the allowable charging power of the lithium battery system, determine a regulated temperature according to the state of charge and the allowable charging power, and change the working mode correspondingly according to the regulated temperature.

[0044] On another hand, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0045] Obtain the first temperature of the lithium battery system, and compare the first temperature with a temperature threshold;

[0046] When the first temperature is less than or equal to the temperature threshold, obtain the rated output power of the charging device, the rated charging power and the rated heating power of the lithium battery system, and select a working mode according to the rated output power, the rated charging power and the rated heating power, where the working mode includes at least one of the following: a heating mode, a charging mode;

[0047] Obtain the state of charge and the allowable charging power of the lithium battery system, determine a regulated temperature according to the state of charge and the allowable charging power, and change the working mode correspondingly according to the regulated temperature.

[0048] The above-mentioned low-temperature charging control method, device, computer equipment and storage medium for lithium batteries can determine whether charging can be directly performed when the lithium battery system is at a first temperature by obtaining the first temperature of the lithium battery system and comparing the first temperature with a temperature threshold. When the first temperature is less than or equal to the temperature threshold, by obtaining the rated output power of the charging device, the rated charging power and the rated heating power of the lithium battery system, and selecting a working mode according to the rated output power, the rated charging power and the rated heating power, it is possible to select the required working mode according to the obtained charging-related data. Among them, the working mode includes at least one of the following: heating mode, charging mode. By obtaining the state of charge and the allowable charging power of the lithium battery system, determining the regulated temperature according to the state of charge and the allowable charging power, and correspondingly changing the working mode according to the regulated temperature, the working mode is correspondingly changed according to the real-time state of the lithium battery system. Through the above-mentioned low-temperature charging control method for lithium batteries, by combining and analyzing various charging-related data, a suitable working mode is selected, improving the charging efficiency and charging safety of the lithium battery system in a low-temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic flowchart of the low-temperature charging control method for lithium batteries in one embodiment;

[0050] Figure 2 It is a schematic flowchart of selecting a working mode in one embodiment;

[0051] Figure 3 It is a schematic flowchart of changing the working mode in one embodiment;

[0052] Figure 4 It is a schematic flowchart of changing the working mode in another embodiment;

[0053] Figure 5 It is a structural block diagram of the low-temperature charging control device for lithium batteries in one embodiment;

[0054] Figure 6 It is an internal structure diagram of computer equipment in one embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0056] The lithium battery low-temperature charging control method provided by this application can be applied to the charging environment of vehicles that use lithium batteries as the main power supply. It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex. The structures, ratios, sizes, etc. shown in the diagrams of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical substantive significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration, and are not used to limit the scope in which the present invention can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope in which the present invention can be implemented.

[0057] In one embodiment, as Figure 1 shown, a lithium battery low-temperature charging control method is provided. Taking the application of this method to a vehicle that uses a lithium battery as the main power supply as an example, the method includes the following steps:

[0058] Step S101, obtain the first temperature of the lithium battery system, and compare the first temperature with a temperature threshold.

[0059] Among them, the lithium battery system refers to the lithium-ion power battery system. For the convenience of description, it will be referred to as the lithium battery system hereinafter. The first temperature refers to the current temperature of the lithium battery system, and the temperature threshold is a value used to distinguish the temperature at which the lithium battery is allowed to be charged from the temperature at which the lithium battery is not allowed to be charged.

[0060] It should be noted that by comparing the first temperature of the lithium battery system with the temperature threshold, it can be known whether the lithium battery system can be charged at the current temperature, and then the corresponding subsequent working mode can be selected according to the actual temperature situation.

[0061] It should also be noted that based on the characteristics of lithium-ion power batteries, usually -20°C is used as the temperature threshold. That is, when the temperature of the lithium-ion power battery is lower than -20°C, in order to ensure battery safety, the lithium-ion power battery is not allowed to be charged.

[0062] Step S102, when the first temperature is less than or equal to the temperature threshold, obtain the rated output power of the charging device, the rated charging power and the rated heating power of the lithium battery system, and select a working mode according to the rated output power, the rated charging power and the rated heating power, where the working mode includes at least one of the following: heating mode, charging mode.

[0063] Among them, the charging device refers to the device that provides energy to the lithium battery system. The rated output power refers to the working power that the charging device reaches when outputting energy to the lithium battery system under normal working conditions. The rated charging power refers to the working power that the charging module of the lithium battery system reaches when receiving charging under normal working conditions. The rated heating power refers to the working power that the heating module can reach when working normally and heating.

[0064] It should be noted that the working mode includes at least one of the following: heating mode, charging mode. When selecting a working mode according to the rated output power, the rated charging power and the rated heating power, you can only select to enable the heating mode, or only select to enable the charging mode, or you can also select to enable both the heating mode and the charging mode so that the heating module and the charging module work simultaneously.

[0065] Step S103, obtain the state of charge and the allowable charging power of the lithium battery system, determine the regulated temperature according to the state of charge and the allowable charging power, and change the working mode correspondingly according to the regulated temperature.

[0066] Among them, the state of charge (SOC) is used to describe the ratio of the remaining capacity of the battery after being used or placed for a period of time to the capacity of its fully charged state, usually expressed as a percentage, and its value range is 0 to 1. When SOC = 0, it means that the battery is completely discharged. When SOC = 1 or 100%, it means that the battery is fully charged; the allowable charging power refers to the power that can support the lithium battery system to charge.

[0067] It should be noted that the lithium battery system can query the charging power mapping table including SOC, allowable charging power and working temperature. In the charging power mapping table, one SOC data and one working temperature data correspond to one allowable charging power data.

[0068] It can be understood that through the charging power mapping table, according to a SOC data and an allowable charging power data, a corresponding working temperature data can also be queried. By obtaining the regulated temperature based on the working temperature queried under a certain working condition, the working mode can be correspondingly changed according to the regulated temperature. However, since the working temperature data is extremely susceptible to interference and changes, in order to ensure the stability and availability of the working temperature data and improve charging safety, a safety temperature for avoiding temperature fluctuations can be added to the queried working temperature, thereby obtaining a regulated temperature with a slightly higher temperature value. Generally, the safety temperature can preferably be any one or more temperature values within the range of 2°C to 5°C. Although the above-mentioned low-temperature charging control method for lithium batteries can also be achieved with any one or more relatively close temperature values outside the range of 2°C to 5°C, the charging effect may be poor and the safety during the charging process cannot be guaranteed.

[0069] Exemplarily, through the charging power mapping table, the first regulated temperature corresponding to the first state of charge and the allowable charging power reaching the rated heating power can be queried; the second regulated temperature corresponding to the second state of charge and the allowable charging power reaching the rated output power can also be queried.

[0070] Further explanation, when the real-time temperature of the lithium battery system is less than or equal to the first regulated temperature, only the heating mode is enabled; when the real-time temperature of the lithium battery system is greater than the first regulated temperature, the heating mode and the charging mode are enabled; when the actual temperature of the lithium battery system is greater than the second regulated temperature, the heating mode is suspended and only the charging mode is enabled.

[0071] In the above-mentioned low-temperature charging control method for lithium batteries, by obtaining the first temperature of the lithium battery system and comparing the first temperature with the temperature threshold, it can be known whether charging can be directly performed when the lithium battery system is at the first temperature; when the first temperature is less than or equal to the temperature threshold, by obtaining the rated output power of the charging device, the rated charging power and the rated heating power of the lithium battery system, and selecting the working mode according to the rated output power, the rated charging power and the rated heating power, it is possible to select the required working mode according to the obtained charging-related data. Among them, the working mode at least includes one of the following: heating mode, charging mode; by obtaining the state of charge and the allowable charging power of the lithium battery system, determining the regulated temperature according to the state of charge and the allowable charging power, and correspondingly changing the working mode according to the regulated temperature, the working mode is correspondingly changed according to the real-time state of the lithium battery system. Through the above-mentioned low-temperature charging control method for lithium batteries, various charging-related data are combined and analyzed, and then a suitable working mode is selected, which improves the charging efficiency and charging safety of the lithium battery system in a low-temperature environment.

[0072] In one embodiment, the comparison between the first temperature and the temperature threshold further includes:

[0073] When the first temperature is greater than the temperature threshold, obtain the state of charge, determine the allowable charging power according to the first temperature and the state of charge, and select the working mode according to the allowable charging power, the rated output power, and the rated charging power.

[0074] It should be noted that in this embodiment, it is also possible to realize the control during the charging process of the lithium battery system when the first temperature of the lithium battery system is greater than the temperature threshold. According to the obtained first temperature and the current state of charge, the corresponding allowable charging power can be queried in the charging power mapping table, and then the corresponding working mode can be selected according to the allowable charging power.

[0075] In one embodiment, the selection of the working mode according to the rated output power, the rated charging power, and the rated heating power includes:

[0076] Compare the rated output power and the rated charging power to determine the heating power threshold including the minimum value, and compare the rated heating power with the heating power threshold;

[0077] If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0078] If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode.

[0079] It should be noted that when the heating mode of the lithium battery system is in the startup state, it will try to heat at the rated heating power. Therefore, it is necessary to determine the numerical comparison relationship between the rated heating power and the rated output power and the rated charging power, and compare the rated heating power with the heating power threshold, so as to determine whether to first select the heating mode or to enable the heating mode and the charging mode at the same time.

[0080] Through this embodiment, even in the case of low-temperature slow charging, the influence of the rated heating power of the heating module on the rated output power and the rated charging power during the charging process will be considered, and the interference to the rated output power and / or the rated charging power during charging will be reduced as much as possible, thereby shortening the charging time and improving the charging efficiency in the case of low-temperature slow charging.

[0081] In one embodiment, reference may be made to Figure 2 which is a schematic flowchart of the process of selecting the working mode. The selection of the working mode according to the allowable charging power, the rated output power, and the rated charging power includes:

[0082] S201. Compare the rated output power and the rated charging power to determine the heating power threshold including the minimum value, and compare the allowable charging power with the heating power threshold;

[0083] S202. If the allowable charging power is greater than or equal to the heating power threshold, select the charging mode;

[0084] S203. If the allowable charging power is less than the heating power threshold, compare the rated heating power with the heating power threshold;

[0085] S204. If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0086] S205. If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode.

[0087] It should be noted that through this embodiment, according to the numerical size relationship of the allowable charging power, the rated output power, and the rated charging power, the required working mode that meets the overall operating power is selected, thereby improving the charging efficiency in the case of low-temperature slow charging.

[0088] In one embodiment, reference may be made to Figure 3 , which is a schematic flowchart of the process of changing the working mode. The changing of the working mode corresponding to the regulated temperature includes:

[0089] S301. If the heating mode is selected, determine the regulated temperature according to the state of charge and the allowable charging power. The regulated temperature includes the allowable charging temperature and the pause heating temperature, and obtain the real-time temperature of the lithium battery system;

[0090] S302. When the real-time temperature reaches the allowable charging temperature, select the heating mode and the charging mode;

[0091] S303. When the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode;

[0092] S311. If the heating mode and the charging mode are selected, determine the pause heating temperature according to the state of charge and the allowable charging power, obtain the real-time temperature, and when the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode.

[0093] Among them, the real-time temperature refers to the real-time working temperature of the lithium battery system.

[0094] It should be noted that through this embodiment, the regulation temperature is determined according to the state of charge and the allowable charging power, and then the working mode is correspondingly changed according to the difference between the real-time temperature and the regulation temperature, so as to improve the charging efficiency under low-temperature slow charging.

[0095] In one embodiment, reference may be made to Figure 4 , which is a schematic flow chart of changing the working mode under another working condition. The corresponding change of the working mode according to the regulation temperature includes:

[0096] S401, when the allowable charging power is less than the heating power threshold, compare the rated heating power with the heating power threshold;

[0097] S402, if the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0098] S403, determine the regulation temperature according to the state of charge and the allowable charging power. The regulation temperature includes the allowable charging temperature and the pause heating temperature, and obtain the real-time temperature of the lithium battery system;

[0099] S404, when the real-time temperature reaches the allowable charging temperature, select the heating mode and the charging mode;

[0100] S405, when the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode.

[0101] S406, if the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode;

[0102] S407, determine the pause heating temperature according to the state of charge and the allowable charging power, obtain the real-time temperature of the lithium battery system, and when the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode.

[0103] It should be noted that through this embodiment, a method for changing the working mode of a lithium battery is realized when the temperature of the lithium battery system is less than the temperature threshold and the allowable charging power is less than the heating power threshold.

[0104] It should also be noted that during charging, it is necessary to determine the numerical comparison relationship between the current allowable charging power and the rated output power and the rated charging power, that is, compare the allowable charging power with the heating power threshold, so as to know whether the rated output power and / or the rated charging power during charging can meet the current allowable charging power, so that the lithium battery system can accept charging.

[0105] Further explanation: When the heating mode of the lithium battery system is in the startup state, heating will be carried out as much as possible at the rated heating power. Therefore, it is also necessary to determine the magnitude relationship between the rated heating power, the rated output power, and the rated charging power, and compare the rated heating power with the heating power threshold, so as to determine whether to first select to enable the heating mode or to enable the heating mode and the charging mode simultaneously.

[0106] Through this embodiment, even in the case of low-temperature slow charging, the influence of the allowable charging power on the rated output power and the rated charging power during the charging process, as well as the influence of the rated heating power of the heating module on the rated output power and the rated charging power during the charging process, will be considered, and the interference on the rated output power and / or the rated charging power during charging will be reduced as much as possible, thereby shortening the charging time and improving the charging efficiency in the case of low-temperature slow charging.

[0107] In one embodiment, after pausing the heating mode, it further includes:

[0108] Monitoring the second temperature of the lithium battery system, and when the second temperature is lower than the regulated temperature, selecting the working mode according to the second temperature and the regulated temperature.

[0109] Among them, the second temperature refers to the temperature obtained in real time after the lithium battery system pauses the heating mode and enters the charging-only mode.

[0110] It should be noted that the "second temperature" in this embodiment and the "first temperature" in the foregoing embodiment are both the temperatures of the lithium battery system obtained in real time. The "first" and "second" are only used to distinguish the different operating environments when obtaining the two temperatures, and other attributes are not limited. It should be understood that because the first temperature and the second temperature are obtained at different times, the first temperature and the second temperature may be different in value.

[0111] It should be understood that although Figures 1-4 the steps in the flowchart of Figures 1-4 are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise clearly stated in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover,

[0112] In one embodiment, as Figure 5As shown, a low-temperature charging control device for a lithium battery is provided, including: an analysis module, a working module, and a control module, where:

[0113] The analysis module is used to obtain the first temperature of the lithium battery system and compare the first temperature with a temperature threshold;

[0114] The working module is used to, when the first temperature is less than or equal to the temperature threshold, obtain the rated output power of the charging device, the rated charging power and the rated heating power of the lithium battery system, and select a working mode according to the rated output power, the rated charging power, and the rated heating power, where the working mode at least includes one of the following: heating mode, charging mode;

[0115] The control module is used to obtain the state of charge and the allowable charging power of the lithium battery system, determine a regulated temperature according to the state of charge and the allowable charging power, and change the working mode correspondingly according to the regulated temperature.

[0116] In one embodiment, the working module further includes a heating module and a charging module, and selects the heating module and / or the charging module to be enabled and work according to the rated output power, the rated charging power, and the rated heating power.

[0117] In one of the embodiments, the comparing the first temperature with the temperature threshold further includes:

[0118] When the first temperature is greater than the temperature threshold, obtain the state of charge, determine the allowable charging power according to the first temperature and the state of charge, and select the working mode according to the allowable charging power, the rated output power, and the rated charging power.

[0119] In one of the embodiments, the selecting the working mode according to the rated output power, the rated charging power, and the rated heating power includes:

[0120] Compare the rated output power and the rated charging power to determine a heating power threshold including the minimum value, and compare the rated heating power with the heating power threshold;

[0121] If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0122] If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode.

[0123] In one of the embodiments, the selecting the working mode according to the allowable charging power, the rated output power, and the rated charging power includes:

[0124] Compare the rated output power and the rated charging power to determine the minimum value, and determine the heating power threshold including the minimum value. Then compare the allowable charging power with the heating power threshold;

[0125] If the allowable charging power is greater than or equal to the heating power threshold, select the charging mode;

[0126] If the allowable charging power is less than the heating power threshold, compare the rated heating power with the heating power threshold;

[0127] If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0128] If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode.

[0129] In one embodiment, the step of correspondingly changing the working mode according to the regulated temperature includes:

[0130] If the heating mode is selected, determine the regulated temperature according to the state of charge and the allowable charging power. The regulated temperature includes the allowable charging temperature and the pause heating temperature, and obtain the real-time temperature of the lithium battery system;

[0131] When the real-time temperature reaches the allowable charging temperature, select the heating mode and the charging mode;

[0132] When the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode;

[0133] If the heating mode and the charging mode are selected, determine the pause heating temperature according to the state of charge and the allowable charging power, obtain the real-time temperature, and when the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode.

[0134] In one embodiment, the step of correspondingly changing the working mode according to the regulated temperature includes:

[0135] When the allowable charging power is less than the heating power threshold, compare the rated heating power with the heating power threshold;

[0136] If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0137] Determine the regulated temperature according to the state of charge and the allowable charging power. The regulated temperature includes the allowable charging temperature and the pause heating temperature, and obtain the real-time temperature of the lithium battery system;

[0138] When the real-time temperature reaches the allowable charging temperature, select the heating mode and the charging mode;

[0139] When the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode.

[0140] If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode;

[0141] Determine the pause heating temperature according to the state of charge and the allowable charging power, obtain the real-time temperature of the lithium battery system, and when the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode.

[0142] In one embodiment, after pausing the heating mode, it further includes:

[0143] Monitor the second temperature of the lithium battery system, and when the second temperature is lower than the regulation temperature, select the working mode according to the second temperature and the regulation temperature.

[0144] For the specific limitations of the lithium battery low-temperature charging control device, reference can be made to the limitations of the lithium battery low-temperature charging control method in the above text, which will not be elaborated here. Each module in the above lithium battery low-temperature charging control device can be implemented in whole or in part by software, hardware and their combination. The above modules can be embedded in the processor of the computer device in hardware form or independent of it, or stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above modules.

[0145] In one embodiment, a computer device is provided. The computer device can be a terminal, and its internal structure diagram can be as Figure 6 shown. The computer device includes a processor, a memory, a network interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements a lithium battery low-temperature charging control method. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer covered on the display screen, or a button, a trackball or a touchpad set on the shell of the computer device, or an external keyboard, a touchpad or a mouse, etc.

[0146] Those skilled in the art can understand that Figure 6 the structure shown in

[0147] is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0148] Obtain the first temperature of the lithium battery system, and compare the first temperature with the temperature threshold;

[0149] When the first temperature is less than or equal to the temperature threshold, obtain the rated output power of the charging device, the rated charging power and the rated heating power of the lithium battery system, and select a working mode according to the rated output power, the rated charging power and the rated heating power, where the working mode includes at least one of the following: heating mode, charging mode;

[0150] Obtain the state of charge and the allowable charging power of the lithium battery system, determine the regulated temperature according to the state of charge and the allowable charging power, and change the working mode correspondingly according to the regulated temperature.

[0151] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0152] When the first temperature is greater than the temperature threshold, obtain the state of charge, determine the allowable charging power according to the first temperature and the state of charge, and select the working mode according to the allowable charging power, the rated output power and the rated charging power.

[0153] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0154] Compare the rated output power and the rated charging power to determine the heating power threshold including the minimum value, and compare the rated heating power with the heating power threshold;

[0155] If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0156] If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode.

[0157] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0158] Compare the rated output power and the rated charging power to determine the heating power threshold including the minimum value, and compare the allowable charging power with the heating power threshold;

[0159] If the allowable charging power is greater than or equal to the heating power threshold, select the charging mode;

[0160] If the allowable charging power is less than the heating power threshold, compare the rated heating power with the heating power threshold;

[0161] If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0162] If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode.

[0163] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0164] If the heating mode is selected, determine the regulated temperature according to the state of charge and the allowable charging power. The regulated temperature includes the allowable charging temperature and the pause heating temperature, and obtain the real-time temperature of the lithium battery system;

[0165] When the real-time temperature reaches the allowable charging temperature, select the heating mode and the charging mode;

[0166] When the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode;

[0167] If the heating mode and the charging mode are selected, determine the pause heating temperature according to the state of charge and the allowable charging power, obtain the real-time temperature, and when the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode.

[0168] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0169] When the allowable charging power is less than the heating power threshold, compare the rated heating power with the heating power threshold;

[0170] If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0171] Determine a regulated temperature according to the state of charge and the allowable charging power, where the regulated temperature includes an allowable charging temperature and a pause heating temperature, and obtain the real-time temperature of the lithium battery system;

[0172] When the real-time temperature reaches the allowable charging temperature, select the heating mode and the charging mode;

[0173] When the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode.

[0174] If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode;

[0175] Determine the pause heating temperature according to the state of charge and the allowable charging power, obtain the real-time temperature of the lithium battery system, and when the real-time temperature reaches the pause heating temperature, pause the heating mode and select the charging mode.

[0176] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0177] Monitor a second temperature of the lithium battery system, and when the second temperature is lower than the regulated temperature, select the working mode according to the second temperature and the regulated temperature.

[0178] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0179] Obtain a first temperature of the lithium battery system and compare the first temperature with a temperature threshold;

[0180] When the first temperature is less than or equal to the temperature threshold, obtain the rated output power of the charging device, the rated charging power and the rated heating power of the lithium battery system, and select a working mode according to the rated output power, the rated charging power and the rated heating power, where the working mode includes at least one of the following: heating mode, charging mode;

[0181] Obtain the state of charge and the allowable charging power of the lithium battery system, determine a regulated temperature according to the state of charge and the allowable charging power, and change the working mode correspondingly according to the regulated temperature.

[0182] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented:

[0183] When the first temperature is greater than the temperature threshold, obtain the state of charge, determine the allowable charging power according to the first temperature and the state of charge, and select the working mode according to the allowable charging power, the rated output power, and the rated charging power.

[0184] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented:

[0185] Compare the rated output power and the rated charging power to determine the heating power threshold including the minimum value, and compare the rated heating power with the heating power threshold;

[0186] If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0187] If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode.

[0188] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented:

[0189] Compare the rated output power and the rated charging power to determine the heating power threshold including the minimum value, and compare the allowable charging power with the heating power threshold;

[0190] If the allowable charging power is greater than or equal to the heating power threshold, select the charging mode;

[0191] If the allowable charging power is less than the heating power threshold, compare the rated heating power with the heating power threshold;

[0192] If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0193] If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode.

[0194] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented:

[0195] If the heating mode is selected, determine the regulation temperature according to the state of charge and the allowable charging power. The regulation temperature includes the allowable charging temperature and the pause heating temperature, and obtain the real-time temperature of the lithium battery system;

[0196] When the real-time temperature reaches the allowable charging temperature, select the heating mode and the charging mode;

[0197] When the real-time temperature reaches the heating pause temperature, pause the heating mode and select the charging mode;

[0198] If the heating mode and the charging mode are selected, determine the heating pause temperature according to the state of charge and the allowed charging power, obtain the real-time temperature, and when the real-time temperature reaches the heating pause temperature, pause the heating mode and select the charging mode.

[0199] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented:

[0200] When the allowed charging power is less than the heating power threshold, compare the rated heating power with the heating power threshold;

[0201] If the rated heating power is less than or equal to the heating power threshold, select the heating mode;

[0202] According to the state of charge and the allowed charging power, determine the regulation temperature, where the regulation temperature includes the allowed charging temperature and the heating pause temperature, and obtain the real-time temperature of the lithium battery system;

[0203] When the real-time temperature reaches the allowed charging temperature, select the heating mode and the charging mode;

[0204] When the real-time temperature reaches the heating pause temperature, pause the heating mode and select the charging mode.

[0205] If the rated heating power is greater than the heating power threshold, select the heating mode and the charging mode;

[0206] Determine the heating pause temperature according to the state of charge and the allowed charging power, obtain the real-time temperature of the lithium battery system, and when the real-time temperature reaches the heating pause temperature, pause the heating mode and select the charging mode.

[0207] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented:

[0208] Monitor the second temperature of the lithium battery system, and when the second temperature is lower than the regulation temperature, select the working mode according to the second temperature and the regulation temperature.

[0209] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0210] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0211] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A method for controlling low-temperature charging of a lithium battery, characterized in that, Including: Obtain the first temperature of the lithium battery system, and compare the first temperature with a temperature threshold; When the first temperature is less than or equal to the temperature threshold, obtain the rated output power of the charging device, the rated charging power and the rated heating power of the lithium battery system, and select an operating mode according to the rated output power, the rated charging power and the rated heating power. Among them, the selection of the operating mode includes: selecting to only enable the heating mode, selecting to only enable the charging mode, or selecting to enable both the heating mode and the charging mode; obtain the state of charge and the allowable charging power of the lithium battery system, determine the regulated temperature according to the state of charge and the allowable charging power, and correspondingly change the selected operating mode according to the regulated temperature; the corresponding change of the selected operating mode according to the regulated temperature includes: when the real-time temperature of the lithium battery system is greater than the allowable charging temperature in the regulated temperature, change the selected operating mode to select to enable both the heating mode and the charging mode; when the real-time temperature is greater than the pause heating temperature in the regulated temperature, change the selected operating mode to select to only enable the charging mode.

2. The lithium battery low-temperature charging control method according to claim 1, wherein After comparing the first temperature with the temperature threshold, it further includes: When the first temperature is greater than the temperature threshold, obtain the state of charge of the lithium battery system, determine the allowable charging power according to the first temperature and the state of charge of the lithium battery system, and select an operating mode according to the allowable charging power, the rated output power and the rated charging power; among them, the selection of the operating mode includes: selecting to only enable the heating mode, selecting to only enable the charging mode, or selecting to enable both the heating mode and the charging mode.

3. The lithium battery low-temperature charging control method according to claim 1, characterized in that The selection of the operating mode according to the rated output power, the rated charging power and the rated heating power includes: Compare the rated output power and the rated charging power to determine the heating power threshold including the minimum value, and compare the rated heating power with the heating power threshold to determine to select to only enable the heating mode, or to enable both the heating mode and the charging mode, so as to reduce the interference on the rated output power and / or the rated charging power during charging.

4. The lithium battery low-temperature charging control method according to claim 2, characterized in that, The selection of the operating mode according to the allowable charging power, the rated output power and the rated charging power includes: Compare the rated output power and the rated charging power to determine the heating power threshold including the minimum value, and compare the allowable charging power with the heating power threshold; If the allowable charging power is greater than or equal to the heating power threshold, select to only enable the charging mode; If the allowable charging power is less than the heating power threshold, compare the rated heating power with the heating power threshold to determine to select to only enable the heating mode, or to enable both the heating mode and the charging mode, so as to reduce the interference on the rated output power and / or the rated charging power during charging.

5. The lithium battery low-temperature charging control method according to claim 3, characterized in that, The corresponding change of the selected operating mode according to the regulated temperature includes: If the selected working mode is to select only the heating mode enabled, determine the regulated temperature according to the state of charge and the allowed charging power, where the regulated temperature includes the allowed charging temperature and the pause heating temperature, and obtain the real-time temperature of the lithium battery system; when the real-time temperature reaches the allowed charging temperature, change the selected working mode to select both the heating mode and the charging mode enabled; when the real-time temperature reaches the pause heating temperature, pause the heating mode in the selected working mode of both the heating mode and the charging mode enabled, and change the selected working mode to select only the charging mode enabled. If the selected working mode is both the heating mode and the charging mode enabled, determine the pause heating temperature according to the state of charge and the allowed charging power, obtain the real-time temperature, and when the real-time temperature reaches the pause heating temperature, pause the heating mode in the selected working mode of both the heating mode and the charging mode enabled, and change the selected working mode to select only the charging mode enabled.

6. The low-temperature charging control method for a lithium battery according to claim 4, wherein After selecting the working mode according to the allowed charging power, the rated output power, and the rated charging power, it further includes: When the allowed charging power is less than the heating power threshold, compare the rated heating power with the heating power threshold. If the rated heating power is less than or equal to the heating power threshold, select the heating mode. Determine the regulated temperature according to the state of charge and the allowed charging power, where the regulated temperature includes the allowed charging temperature and the pause heating temperature, and obtain the real-time temperature of the lithium battery system. When the real-time temperature reaches the allowed charging temperature, change the selected working mode to select both the heating mode and the charging mode enabled. When the real-time temperature reaches the pause heating temperature, pause the heating mode in the selected working mode of both the heating mode and the charging mode enabled, and change the selected working mode to select only the charging mode enabled; where the pause heating temperature is determined according to the state of charge and the allowed charging power.

7. The low-temperature charging control method for a lithium battery according to claim 5 or 6, characterized in that After pausing the heating mode in the selected working mode of both the heating mode and the charging mode enabled and changing the selected working mode to select only the charging mode enabled, it further includes: Monitor the second temperature of the lithium battery system, and when the second temperature is lower than the regulated temperature, select the working mode according to the second temperature and the regulated temperature.

8. A low-temperature charging control device, characterized in that, The device includes: An analysis module, configured to obtain the first temperature of the lithium battery system and compare the first temperature with the temperature threshold. A working module, configured to, when the first temperature is less than or equal to the temperature threshold, obtain the rated output power of the charging device, the rated charging power, and the rated heating power of the lithium battery system, and select the working mode according to the rated output power, the rated charging power, and the rated heating power, where the selected working mode includes: selecting only the heating mode enabled, selecting only the charging mode enabled, or selecting both the heating mode and the charging mode enabled. A control module, configured to obtain the state of charge and the allowable charging power of the lithium battery system, determine a regulated temperature based on the state of charge and the allowable charging power, and correspondingly change the selected operating mode according to the regulated temperature; the correspondingly changing the selected operating mode according to the regulated temperature includes: when the real-time temperature of the lithium battery system is greater than the allowable charging temperature in the regulated temperature, changing the selected operating mode to select both the heating mode and the charging mode to be enabled; when the real-time temperature is greater than the pause heating temperature in the regulated temperature, changing the selected operating mode to select only the charging mode to be enabled.

9. A computer device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the low-temperature charging control method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the low-temperature charging control method according to any one of claims 1 to 7.

Images