Power battery charging control method, device, vehicle and storage medium

Abstract

The present invention relates to a charging control method, device, vehicle and storage medium for a power battery, comprising: charging the current power battery at a first preset rate based on a received charging instruction; if a first frame latitude signal that meets a preset validity condition is received within a first preset time period, and the first frame latitude signal is less than or equal to a preset latitude threshold, continuing to charge based on the first preset rate; when the current battery voltage is greater than the first preset voltage threshold, charging the power battery at a second preset rate until the current battery voltage reaches the second preset voltage threshold. This solves the problems of low charging current and power, inability to release battery capacity to the maximum extent, charging voltage exceeding the battery cut-off voltage, resulting in damage such as bulging and short circuiting of the battery, threatening the safety of power battery use, imperfect thermal management measures, severe heating of the battery during the charging process, or lithium deposition in the battery cell leading to a short circuit in the battery pack, reducing the battery cycle life, and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted power batteries, and in particular to a charging control method, device, vehicle, and storage medium for a power battery. Background Art

[0002] Power batteries are the core components of electric vehicles. Lithium-ion power batteries have high energy density, voltage platform, and good cycle performance, so they are widely used in the field of on-board power batteries. With the rapid development of the new energy market, users have placed higher requirements on the charging performance of lithium-ion power batteries. The charging performance of power batteries is highly related to the battery cell material, cycle life, and ambient temperature. However, currently, due to the limitations of battery cell material technology, most efforts to improve power battery charging performance focus on charging control strategies. However, if the control strategy is not formulated properly, it is easy to cause a series of serious consequences as follows:

[0003] (1) The charging current and power are too small to release the battery capacity to the maximum extent;

[0004] (2) The charging voltage exceeds the battery cut-off voltage, causing the battery to be overcharged. Over time, this can lead to damage such as bulging and short circuiting of the battery, threatening the safety of the power battery.

[0005] (3) Imperfect thermal management measures cause the battery to heat up severely during the charging process, or lithium deposition in the battery cell causes a short circuit in the battery pack, reducing the battery cycle life.

[0006] In the related art, a charging method (application publication number CN110509786) is proposed, which improves charging performance by optimizing the battery pack module layout, setting a preheating device and changing the module charging sequence. However, this method limits the charging sequence of each battery module at low temperatures and has many restrictions on the module layout, which is not conducive to industrial application.

[0007] Related technologies also propose a power battery charging system, charging method, and electric vehicle (application publication number CN110435478A). These systems employ various charging modes, including heating only, heating while charging, charging only, and cooling while charging, to maintain the power battery in an optimal temperature range and improve charging performance. However, due to geographical differences between the north and south, temperature differences significantly impact the battery pack's state. Using only a single charging current map (MAP) is insufficient to maximize the battery's charging performance in different regions. Summary of the Invention

[0008] One of the purposes of the present invention is to provide a charging control method, device, vehicle and storage medium for a power battery, which solves the problems of small charging current and power, inability to release battery capacity to the maximum extent, charging voltage exceeding the battery cut-off voltage, resulting in battery bulging, short circuit and other damages, threatening the safe use of power batteries, imperfect thermal management measures, severe battery heating during the charging process, or lithium plating in the battery cell leading to short circuit in the battery pack, reducing the battery cycle life, etc., to achieve the optimal charging effect of ensuring the charging power, reducing the charging time, and being applicable to different regions and the entire temperature range; the second purpose is to provide a charging control device for a power battery; the third purpose is to provide a vehicle; the third purpose is to provide a computer-readable storage medium.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] A charging control method for a power battery includes the following steps: when charging the current power battery at a first preset rate based on a received charging instruction, determining whether a first frame latitude signal that meets a preset validity condition is received within the first preset time; if a first frame latitude signal that meets the preset validity condition is received within the first preset time, determining whether the first frame latitude signal is less than or equal to a preset latitude threshold, and continuing to charge based on the first preset rate when the first frame latitude signal is less than or equal to the preset latitude threshold; and determining whether the current battery voltage is greater than a first preset voltage threshold, and when the current battery voltage is greater than the first preset voltage threshold, charging the power battery at a second preset rate until the current battery voltage reaches the second preset voltage threshold.

[0011] According to the above technical means, the problems of small charging current and power, inability to release battery capacity to the maximum extent, charging voltage exceeding the battery cut-off voltage, resulting in battery bulging, short circuit and other damages, threatening the safe use of power batteries, imperfect thermal management measures, severe battery heating during the charging process, or lithium plating in the battery cell causing short circuit in the battery pack, reducing the battery cycle life, etc. are solved, achieving the optimal charging effect of ensuring the charging power, reducing the charging time, and being applicable to different regions and the entire temperature range.

[0012] Furthermore, after determining whether the first frame latitude signal is less than or equal to the preset latitude threshold, it also includes: if the first frame latitude signal is greater than the preset latitude threshold, charging the power battery according to a third preset rate, and determining whether the current battery voltage is greater than the first preset voltage threshold; if the current battery voltage is greater than the first preset voltage threshold, charging the power battery according to a second preset rate until the current battery voltage reaches the second preset voltage threshold.

[0013] According to the above technical means, when the first frame latitude signal is greater than the preset latitude threshold, the power battery is charged at a high rate, which can improve charging efficiency. Under high-rate normal temperature charging conditions, the cutoff voltage threshold is set higher. At the same actual charging current, the battery cutoff voltage continuously decreases with increasing temperature, avoiding overcharging with low current and undercharging with high current.

[0014] Furthermore, after determining whether the first frame latitude signal that meets the preset validity condition is received within the first preset time period, it also includes: if the first frame latitude signal is not received, continuing to charge based on the first preset rate, and determining whether the current battery voltage is greater than the first preset voltage threshold; if the current battery voltage is greater than the first preset voltage threshold, charging the power battery at a second preset rate until the current battery voltage reaches the second preset voltage threshold and the duration reaches the second preset time period.

[0015] According to the above technical means, small-rate charging MAP charging is adopted to ensure the maximum range of battery charging efficiency. Under small-rate normal temperature charging conditions, the charging cut-off voltage is designed to be relatively small. Under large-rate normal temperature charging conditions, the cut-off voltage threshold is set higher. For the same actual charging current, as the temperature rises, the battery cut-off voltage continues to decrease, avoiding the problems of overcharging with small current and undercharging with large-rate current.

[0016] Furthermore, after the current battery voltage reaches the second preset voltage threshold, it also includes: obtaining the duration of time that the current battery voltage reaches the second preset voltage threshold; judging whether the duration is greater than the second preset duration; if the duration is greater than the second preset duration, stopping charging the power battery.

[0017] According to the above technical means, the charging time is reduced.

[0018] Furthermore, after determining whether the duration is greater than the second preset duration, the method further includes: if the duration is less than or equal to the second preset duration, continuing to charge the power battery at the second preset rate.

[0019] According to the above technical means, when the duration is less than or equal to the second preset duration, the power battery continues to be charged at the second preset rate to ensure the amount of power charged.

[0020] Further, after determining that the first frame latitude signal is less than or equal to the preset latitude threshold, the method further includes:

[0021] Determining whether a first frame longitude signal meeting a preset validity condition is received within a third preset time period;

[0022] If a first frame longitude signal that meets the preset validity condition is received within the third preset time period, and the first frame longitude signal is less than or equal to the preset longitude threshold, charging based on the first preset rate continues; otherwise, charging based on the third preset rate is performed.

[0023] According to the above technical means, under the same latitude, the influence of longitude on power battery charging is further considered, which effectively improves the charging efficiency of the power battery.

[0024] A charging control device for a power battery comprises: a judgment module for judging whether a first frame latitude signal that meets a preset validity condition is received within the first preset time period when charging the current power battery at a first preset rate based on a received charging instruction; a first charging module for judging whether the first frame latitude signal is less than or equal to a preset latitude threshold if the first frame latitude signal that meets the preset validity condition is received within the first preset time period, and continuing to charge based on the first preset rate when the first frame latitude signal is less than or equal to the preset latitude threshold; a second charging module for judging whether the current battery voltage is greater than a first preset voltage threshold, and when the current battery voltage is greater than the first preset voltage threshold, charging the power battery at a second preset rate until the current battery voltage reaches the second preset voltage threshold.

[0025] Furthermore, after determining whether the first frame latitude signal is less than or equal to the preset latitude threshold, the first charging module is also used to: if the first frame latitude signal is greater than the preset latitude threshold, charge the power battery according to a third preset rate, and determine whether the current battery voltage is greater than the first preset voltage threshold; if the current battery voltage is greater than the first preset voltage threshold, charge the power battery according to a second preset rate until the current battery voltage reaches the second preset voltage threshold.

[0026] Furthermore, after determining whether the first frame latitude signal that meets the preset validity condition is received within the first preset time period, the judgment module is also used to: if the first frame latitude signal is not received, continue charging based on the first preset rate, and determine whether the current battery voltage is greater than the first preset voltage threshold; if the current battery voltage is greater than the first preset voltage threshold, charge the power battery at a second preset rate until the current battery voltage reaches the second preset voltage threshold and the duration reaches the second preset time period.

[0027] Furthermore, after the current battery voltage reaches the second preset voltage threshold, the second charging module is also used to: obtain the duration of time that the current battery voltage reaches the second preset voltage threshold; determine whether the duration is greater than the second preset duration; if the duration is greater than the second preset duration, stop charging the power battery.

[0028] Furthermore, after determining whether the duration is greater than the second preset duration, the second charging module is further configured to: if the duration is less than or equal to the second preset duration, continue to charge the power battery at the second preset rate.

[0029] Furthermore, after determining that the first frame latitude signal is less than or equal to the preset latitude threshold, the first charging module is further configured to: determine whether a first frame longitude signal that satisfies a preset validity condition is received within a third preset time period; if a first frame longitude signal that satisfies the preset validity condition is received within the third preset time period, and the first frame longitude signal is less than or equal to the preset longitude threshold, then continue charging based on the first preset rate; otherwise, charge based on the third preset rate. A vehicle comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the power battery charging control method described in the above-described embodiment.

[0030] A computer-readable storage medium stores a computer program, which is executed by a processor to implement the power battery charging control method as described in the above embodiment.

[0031] The beneficial effects of the present invention are as follows: it solves the problems of low charging current and power, inability to release battery capacity to the maximum extent, charging voltage exceeding the battery cut-off voltage, resulting in battery bulging, short circuit and other damages, threatening the safe use of power batteries, imperfect thermal management measures, severe battery heating during the charging process, or lithium deposition in the battery cell leading to short circuit in the battery pack, reducing the battery cycle life, etc., and achieves the optimal charging effect of ensuring the charging power, reducing the charging time, and being applicable to different regions and the entire temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0033] Figure 1 This is a flow chart of a power battery charging control method of the present invention;

[0034] Figure 2 This is a flow chart of the power battery charging control method of the present invention;

[0035] Figure 3 This is an example diagram of a charging control device for a power battery of the present invention;

[0036] Figure 4 It is a schematic structural diagram of a vehicle of the present invention.

[0037] Among them, 10 is a charging control device for a power battery; 100 is a judgment module; 200 is a first charging module; 300 is a second charging module; 401 is a memory; 402 is a processor; and 403 is a communication interface. DETAILED DESCRIPTION

[0038] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the various details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0039] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0040] This embodiment provides a charging control method for a power battery. Figure 1 This is a flow chart of a method for controlling charging of a power battery provided in this embodiment.

[0041] like Figure 1 As shown, the power battery charging control method includes the following steps:

[0042] In step S101, when charging the current power battery at a first preset rate based on the received charging instruction, it is determined whether a first frame latitude signal that meets a preset validity condition is received within a first preset time period.

[0043] The first preset duration may be a threshold value pre-set by a user, a threshold value obtained through a limited number of experiments, or a threshold value obtained through a limited number of computer simulations. Preferably, the first preset duration is within 0-TBD1 seconds. The first frame latitude signal that meets the preset validity condition is a first frame latitude signal whose latitude value is 0°≤N≤90°.

[0044] It is understandable that the user issues a charging instruction. After receiving the user's charging instruction, the current power battery is charged using the first preset rate (i.e., small rate charging MAP1), and it is determined whether the first frame latitude signal that meets the preset validity conditions is received within 0-TBD1 seconds during the charging process.

[0045] Furthermore, in some embodiments, after determining whether the first frame latitude signal that meets the preset validity conditions is received within the first preset time period, it also includes: if the first frame latitude signal is not received, continuing to charge based on the first preset rate, and determining whether the current battery voltage is greater than the first preset voltage threshold; if the current battery voltage is greater than the first preset voltage threshold, charging the power battery according to the second preset rate until the current battery voltage reaches the second preset voltage threshold and the duration reaches the second preset time period.

[0046] The first preset time length may be a threshold value pre-set by the user, a threshold value obtained through a limited number of experiments, or a threshold value obtained through a limited number of computer simulations. Preferably, the second preset time length is TBD3 seconds.

[0047] Specifically, if the first frame latitude signal that meets the preset validity conditions is not received, or the received first frame latitude signal exceeds TBD1 second, charging continues at a small rate MAP1. Before the battery is about to reach the charging cut-off voltage U1, the current battery voltage is obtained. If the current battery voltage is greater than the first preset voltage threshold U2, the power battery is charged at the second preset rate (i.e., the higher rate charging MAP3). At this time, the BMS (Battery Management System) sends a request current according to the original charging MAP, and the charging pile responds to the request and sends the actual charging current according to its own capabilities. The second preset voltage threshold U3 is looked up in the table according to the actual current and the maximum temperature of the battery pack. Charging is stopped until the current battery voltage reaches the second preset voltage threshold U3 and lasts for TBD3 seconds.

[0048] It should be noted that U1 is a fixed value, and for ternary lithium-ion batteries, 4.3 V can be used as a reference. The first preset voltage threshold = cut-off voltage U1 - TBD2, i.e., U2 = U1 - TBD2, where TBD2 can be set according to different temperatures and SOCs.

[0049] In step S102, if the first frame latitude signal that meets the preset validity conditions is received within the first preset time period, it is determined whether the first frame latitude signal is less than or equal to the preset latitude threshold, and when the first frame latitude signal is less than or equal to the preset latitude threshold, charging based on the first preset rate continues.

[0050] Furthermore, in some embodiments, after determining whether the first frame latitude signal is less than or equal to the preset latitude threshold, it also includes: if the first frame latitude signal is greater than the preset latitude threshold, charging the power battery according to a third preset rate, and determining whether the current battery voltage is greater than the first preset voltage threshold; if the current battery voltage is greater than the first preset voltage threshold, charging the power battery according to a second preset rate until the current battery voltage reaches the second preset voltage threshold.

[0051] Specifically, if the latitude signal of the first frame is greater than the preset latitude threshold (i.e., N°), the power battery is charged according to the third preset rate (i.e., large rate charging MAP2); if the current voltage is greater than the first preset voltage threshold U2, the power battery is charged according to the second preset rate until the current battery voltage reaches the second preset voltage threshold U3.

[0052] For example, assuming the preset latitude threshold is 23.13°, when the latitude value of the first frame latitude signal is greater than 23.13°, the power battery is charged according to the high-rate charging MAP2 when the latitude is north of the preset latitude. If the latitude value of the first frame latitude signal is less than or equal to 23.13°, the power battery is charged according to the low-rate charging MAP when the latitude is south of the preset latitude.

[0053] It should be noted that after receiving the first frame latitude value that meets the preset validity conditions to determine the switching charging MAP, even if a valid latitude signal is received again, the MAP switching will not be performed to avoid repeated jumps in the charging current, which will affect the charging effect and user experience.

[0054] In step S103, it is determined whether the current battery voltage is greater than a first preset voltage threshold, and if the current battery voltage is greater than the first preset voltage threshold, the power battery is charged at a second preset rate until the current battery voltage reaches the second preset voltage threshold.

[0055] Furthermore, in some embodiments, after the current battery voltage reaches the second preset voltage threshold, it also includes: obtaining the duration of the current battery voltage reaching the second preset voltage threshold; judging whether the duration is greater than the second preset duration; if the duration is greater than the second preset duration, stopping charging the power battery.

[0056] Furthermore, in some embodiments, after determining whether the duration is greater than a second preset duration, the method further includes: if the duration is less than or equal to the second preset duration, continuing to charge the power battery at a second preset rate.

[0057] Specifically, if the current battery voltage reaches the second preset voltage threshold U3 for a duration greater than TBD3 seconds, charging of the power battery is stopped; if the current battery voltage reaches the second preset voltage threshold U3 for a duration less than or equal to TBD3 seconds, charging of the power battery continues at the second preset rate.

[0058] Furthermore, after determining that the first frame latitude signal is less than or equal to the preset latitude threshold, it also includes: determining whether the first frame longitude signal that meets the preset validity conditions is received within the third preset time length; if the first frame longitude signal that meets the preset validity conditions is received within the third preset time length, and the first frame longitude signal is less than or equal to the preset longitude threshold, continue charging based on the first preset rate, otherwise, charge based on the third preset rate.

[0059] It should be understood that due to different climate distributions, there may be significant differences in climate types at the same latitude but different longitudes. For example, my country has a subtropical monsoon climate, and to the west is the Qinghai-Tibet Plateau (such as a plateau mountain climate), a tropical desert climate, a Mediterranean climate, etc. Therefore, in order to ensure the charging efficiency of the power battery, the embodiment of the present application may determine the first frame of the longitude signal that satisfies the preset validity conditions after determining the first frame of the latitude signal, and then determine the charging rate of the power battery based on the latitude signal and the longitude signal.

[0060] Therefore, by combining the longitude and latitude to determine the charging rate of the power battery, the charging efficiency of the power battery is made higher.

[0061] In order to enable those skilled in the art to further understand the power battery charging control method of this embodiment, the following is a detailed description with reference to specific embodiments. Figure 2 shown.

[0062] In step S201, the vehicle enters charging mode and is charged at a first preset rate by default.

[0063] In step S202, it is determined whether a first frame of latitude signal meeting a preset validity condition is received within a first preset time period. If received, step S203 is executed; if not, step S204 is executed.

[0064] In step S203, it is determined whether the latitude signal of the first frame meeting the validity condition is less than or equal to a preset latitude threshold. If it is less than or equal to the preset latitude threshold, step S204 is executed; if it is greater than the preset latitude threshold, step S205 is executed.

[0065] In step S204 , the power battery is charged according to the first preset rate MAP1 , and the process jumps to step S206 .

[0066] In step S205 , the power battery is charged according to a third preset rate MAP2 .

[0067] In step S206, it is determined whether the battery voltage has reached the first preset voltage threshold U2. If so, step S207 is executed. If not, the process jumps to step S204 if the power battery is currently being charged at the first preset rate, or jumps to step S205 if the power battery is currently being charged at the second preset rate.

[0068] In step S207, the final stage of the charging process is entered, and whether the battery is fully charged is determined according to the second preset rate MAP3.

[0069] In step S208, it is determined whether the voltage of the battery reaches the second preset voltage threshold U3 and lasts for the second preset time. If it does not reach the second preset voltage threshold U3 and lasts for the second preset time, step S207 is repeated. If it reaches the second preset voltage threshold U3 and lasts for the second preset time, charging is terminated.

[0070] For example, this embodiment uses a certain latitude threshold as the latitude dividing line (refer to 23.13° north latitude) based on the weather and temperature conditions in various parts of my country. North of this latitude, a higher rate is used to control charging. Since the temperature in the north is lower, the high rate current can increase the charging rate on the one hand, and the heat generated can also have a certain heating effect on the battery on the other hand; south of 23.13° north latitude, due to the hot and humid weather in the south, excessive battery temperature rise will instead reduce the requested current, reduce charging performance, and even cause risks such as thermal runaway. At the same time, considering that excessive temperature rise will greatly shorten the battery life, a small rate charging is adopted to ensure that the battery charging efficiency is improved to the maximum extent.

[0071] Furthermore, given the varying quality of charging piles on the market and their varying current output capabilities, the battery's requested current may not match the actual charging current. Therefore, a higher rate is used to determine full charge before the battery is fully charged, that is, before the highest cell voltage reaches the cutoff voltage. Multiple columns of current values ​​are set at a higher rate, and these current values ​​represent the actual output current of the charging pile. Different cutoff voltages are set based on the battery pack temperature and actual charging current. Under low-rate and normal-temperature charging conditions, the charging cutoff voltage is designed to be relatively low. Under high-rate and normal-temperature charging conditions, the cutoff voltage threshold is set higher. For the same actual charging current column, as the temperature rises, the battery cutoff voltage continues to decrease, avoiding overcharging with low currents and undercharging with high-rate currents.

[0072] In summary, this embodiment divides the charging intervals according to different latitudes, uses different charging rates to charge the power battery, and sets different charging cut-off voltages in the last stage of the charging process according to the actual charging current of the charging pile and the battery pack temperature.

[0073] In this embodiment, a charging control device for a power battery is also provided. Figure 34 is a block diagram of the charging control device for the power battery of this embodiment.

[0074] like Figure 3 As shown, the power battery charging control device 10 includes: a judgment module 100 , a first charging module 200 and a second charging module 300 .

[0075] Among them, the judgment module 100 is used to judge whether a first frame latitude signal that meets the preset validity conditions is received within a first preset time period when charging the current power battery at a first preset rate based on the received charging instruction; the first charging module 200 is used to judge whether the first frame latitude signal is less than or equal to the preset latitude threshold if the first frame latitude signal that meets the preset validity conditions is received within the first preset time period, and continue charging based on the first preset rate when the first frame latitude signal is less than or equal to the preset latitude threshold; the second charging module 300 is used to judge whether the current battery voltage is greater than the first preset voltage threshold, and when the current battery voltage is greater than the first preset voltage threshold, charge the power battery at the second preset rate until the current battery voltage reaches the second preset voltage threshold.

[0076] Furthermore, in some embodiments, after determining whether the first frame latitude signal is less than or equal to the preset latitude threshold, the first charging module 200 is also used to: if the first frame latitude signal is greater than the preset latitude threshold, charge the power battery according to a third preset rate, and determine whether the current battery voltage is greater than the first preset voltage threshold; if the current battery voltage is greater than the first preset voltage threshold, charge the power battery according to a second preset rate until the current battery voltage reaches the second preset voltage threshold.

[0077] Furthermore, in some embodiments, after determining whether the first frame latitude signal that meets the preset validity conditions is received within the first preset time period, the judgment module 100 is also used to: if the first frame latitude signal is not received, continue charging based on the first preset rate, and determine whether the current battery voltage is greater than the first preset voltage threshold; if the current battery voltage is greater than the first preset voltage threshold, charge the power battery at a second preset rate until the current battery voltage reaches the second preset voltage threshold and the duration reaches the second preset time period.

[0078] Furthermore, in some embodiments, after the current battery voltage reaches the second preset voltage threshold, the second charging module 300 is also used to: obtain the duration of the current battery voltage reaching the second preset voltage threshold; determine whether the duration is greater than the second preset duration; if the duration is greater than the second preset duration, stop charging the power battery.

[0079] Furthermore, in some embodiments, after determining whether the duration is greater than a second preset duration, the second charging module 300 is further configured to: if the duration is less than or equal to the second preset duration, continue to charge the power battery at a second preset rate.

[0080] Further, in some embodiments, after determining that the first frame latitude signal is less than or equal to the preset latitude threshold, the first charging module 200 is also used to: determine whether the first frame longitude signal that meets the preset validity conditions is received within the third preset time period; if the first frame longitude signal that meets the preset validity conditions is received within the third preset time period, and the first frame longitude signal is less than or equal to the preset longitude threshold, continue charging based on the first preset rate; otherwise, charge based on the third preset rate.

[0081] It should be noted that the aforementioned explanation of the embodiment of the power battery charging control method is also applicable to the power battery charging control device of this embodiment, and will not be repeated here.

[0082] The present invention charges the current power battery at a first preset rate based on the received charging instruction. If the first frame of latitude signal that meets the preset validity conditions is received within the first preset time, and the first frame of latitude signal is less than or equal to the preset latitude threshold, the charging continues based on the first preset rate. When the current battery voltage is greater than the first preset voltage threshold, the power battery is charged at a second preset rate until the current battery voltage reaches the second preset voltage threshold. This solves the problems of low charging current and power, which prevent the battery from releasing its capacity to the maximum extent, charging voltage exceeding the battery cut-off voltage, resulting in bulging, short circuit and other damage to the battery, threatening the safety of power battery use, imperfect thermal management measures, severe battery heating during the charging process, or lithium plating in the battery cell leading to a short circuit in the battery pack, reducing the battery cycle life, and achieving the optimal charging effect of ensuring the charging power, reducing the charging time, and being applicable to different regions and the entire temperature range.

[0083] In this embodiment, a vehicle is also proposed. Figure 4 This is a schematic diagram of the structure of a vehicle provided in this embodiment. The vehicle may include:

[0084] Memory 401 , processor 402 , and computer programs stored in the memory 401 and executable on the processor 402 .

[0085] When the processor 402 executes the program, the power battery charging control method provided in the above embodiment is implemented.

[0086] Furthermore, the vehicle further comprises:

[0087] The communication interface 403 is used for communication between the memory 401 and the processor 402 .

[0088] The memory 401 is used to store computer programs that can be run on the processor 402 .

[0089] The memory 401 may include a high-speed RAM (Random Access Memory) memory, and may also include a non-volatile memory, such as at least one disk memory.

[0090] If the memory 401, the processor 402, and the communication interface 403 are implemented independently, the communication interface 403, the memory 401, and the processor 402 can be connected to each other via a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0091] Optionally, in a specific implementation, if the memory 401, the processor 402 and the communication interface 403 are integrated on a chip, the memory 401, the processor 402 and the communication interface 403 can communicate with each other through an internal interface.

[0092] The processor 402 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the present embodiment.

[0093] In this embodiment, a computer-readable storage medium is further provided, on which a computer program is stored. When the program is executed by a processor, the above-mentioned power battery charging control method is implemented.

[0094] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A power battery charging control method, characterized in that: The following steps are involved: When charging the current power battery at a first preset rate based on the received charging instruction, determining whether a first frame of latitude signal meeting a preset validity condition is received within a first preset time period; If a first frame latitude signal that meets the preset validity condition is received within the first preset time period, determining whether the first frame latitude signal is less than or equal to a preset latitude threshold, and continuing charging based on the first preset rate when the first frame latitude signal is less than or equal to the preset latitude threshold; as well as determining whether a current battery voltage is greater than a first preset voltage threshold, and if the current battery voltage is greater than the first preset voltage threshold, charging the power battery at a second preset rate until the current battery voltage reaches the second preset voltage threshold; After determining whether the first frame latitude signal is less than or equal to the preset latitude threshold, the method further includes: If the first frame latitude signal is greater than the preset latitude threshold, charging the power battery according to a third preset rate, and determining whether the current battery voltage is greater than the first preset voltage threshold; If the current battery voltage is greater than the first preset voltage threshold, the power battery is charged at a second preset rate until the current battery voltage reaches the second preset voltage threshold. Among them, the first preset voltage threshold = cut-off voltage - TBD2, TBD2 is set according to temperature and SOC, and the second preset voltage threshold is obtained by looking up the table according to the actual current of the charging pile and the maximum temperature of the battery pack.

2. The power battery charging control method according to claim 1, characterized in that: After determining whether the first frame latitude signal meeting the preset validity condition is received within the first preset time period, the method further includes: If the first frame latitude signal is not received, continuing charging based on the first preset rate and determining whether the current battery voltage is greater than the first preset voltage threshold; If the current battery voltage is greater than the first preset voltage threshold, the power battery is charged at a second preset rate until the current battery voltage reaches the second preset voltage threshold and the duration reaches a second preset time.

3. The power battery charging control method according to any one of claims 1-2, characterized in that: After the current battery voltage reaches the second preset voltage threshold, the method further includes: Obtaining a duration during which the current battery voltage reaches the second preset voltage threshold; Determining whether the duration is greater than a second preset duration; If the duration is greater than the second preset time, charging of the power battery is stopped.

4. The power battery charging control method according to claim 3, characterized in that: After determining whether the duration is greater than the second preset duration, the method further includes: If the duration is less than or equal to the second preset duration, the power battery continues to be charged at the second preset rate.

5. The power battery charging control method according to claim 1, characterized in that: After determining that the first frame latitude signal is less than or equal to the preset latitude threshold, the method further includes: Determining whether a first frame longitude signal meeting a preset validity condition is received within a third preset time period; If a first frame longitude signal that meets the preset validity condition is received within the third preset time period, and the first frame longitude signal is less than or equal to the preset longitude threshold, charging based on the first preset rate continues; otherwise, charging based on the third preset rate is performed.

6. A power battery charging control device, characterized in that: include: a determination module, configured to determine whether a first frame of latitude signal meeting a preset validity condition is received within a first preset time period when charging the current power battery at a first preset rate based on a received charging instruction; a first charging module configured to, upon receiving a first frame latitude signal satisfying the preset validity condition within the first preset time period, determine whether the first frame latitude signal is less than or equal to a preset latitude threshold, and continue charging based on the first preset rate if the first frame latitude signal is less than or equal to the preset latitude threshold; as well as a second charging module, configured to determine whether a current battery voltage is greater than a first preset voltage threshold, and if the current battery voltage is greater than the first preset voltage threshold, charge the power battery at a second preset rate until the current battery voltage reaches the second preset voltage threshold; After determining whether the first frame latitude signal is less than or equal to the preset latitude threshold, the first charging module is further configured to: If the first frame latitude signal is greater than the preset latitude threshold, charging the power battery according to a third preset rate, and determining whether the current battery voltage is greater than the first preset voltage threshold; If the current battery voltage is greater than the first preset voltage threshold, the power battery is charged at a second preset rate until the current battery voltage reaches the second preset voltage threshold. Among them, the first preset voltage threshold = cut-off voltage - TBD2, TBD2 is set according to temperature and SOC, and the second preset voltage threshold is obtained by looking up the table according to the actual current of the charging pile and the maximum temperature of the battery pack.

7. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the power battery charging control method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the charging control method for a power battery as described in any one of claims 1 to 5.

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