Low-voltage large-current fast charging method and device

Abstract

The invention discloses a low-voltage large-current fast charging method and device, and the method and device can effectively reduce the charging voltage through employing a low-voltage large-current charging mode, thereby improving the safety in a use process, and can reduce the protection requirement for a charging gun connection cable compared with a high voltage. Meanwhile, the charging current is controlled by comprehensively considering data such as the initial current, the environment temperature and the internal resistance of the battery, so that the problem of excessive temperature rise caused by high-current charging can be reduced while high-power charging is provided, and a basis is provided for safe charging.

Description

Technical Field

[0001] The present application relates to the field of two-wheeled vehicles, and in particular to a low-voltage, high-current fast charging method and device. Background Art

[0002] As a convenient means of transportation, two-wheeled vehicles are widely used in people's lives. At present, two-wheeled vehicles have also begun to implement fast charging solutions, but most of the existing fast charging solutions directly adopt the high-voltage charging solution of electric four-wheeled vehicles and directly transfer it to the charging of two-wheeled vehicles. However, the frequency of use of charging guns for two-wheeled vehicles is higher than that of four-wheeled vehicles, and the quality of the charging population is difficult to control, which makes it easy to cause safety problems during charging, or cause damage to the connecting cables of the charging guns. In addition, once the charging piles for two-wheeled vehicles are implemented, the density of charging piles will inevitably be higher than that of four-wheeled vehicles, that is, the number of charging piles will be more, and safety problems will inevitably increase. If better materials are used to make the cable protection layer, it will inevitably lead to a significant increase in costs. Summary of the invention

[0003] The present application aims to propose a low-voltage, high-current fast charging method and device, which can improve the safety of the fast charging process at a lower cost.

[0004] The low-voltage, high-current fast charging method according to the first aspect of the present application is applied to a charging pile, the charging pile is detachably electrically connected to the battery in the two-wheeled vehicle, and is used to charge the battery; the charging pile is provided with an ambient temperature sensor for detecting the ambient temperature; the battery is provided with a management system, the management system stores battery coding information, and the battery cell is provided with a first temperature sensor for detecting the battery cell temperature, and the first temperature sensor transmits the collected battery cell temperature data to the management system; When the charging pile is electrically connected to the battery, the low-voltage and high-current fast charging method includes: Get the current battery cell temperature at the current moment; Get the current ambient temperature at the current moment; Obtaining the current charging current of the battery being charged by the charging pile at the current moment; Determining a temperature change trend according to the current battery cell temperature and the historical battery cell temperature; Determine a first current adjustment coefficient of a charging current used by the charging pile to charge the battery according to the temperature change trend; The first current adjustment coefficient is corrected according to the initial current and the current charging current to obtain a second current adjustment coefficient; the initial current is determined according to the current ambient temperature, the battery cell model of the battery, and the pre-acquired internal resistance information of the battery, and the battery cell model is determined according to the battery coding information; Correcting the second current adjustment coefficient according to the current ambient temperature to obtain a third current adjustment coefficient; The charging current is adjusted according to the third current adjustment coefficient.

[0005] According to the low-voltage, high-current fast-charging device of the second aspect of the present application, the charging pile is electrically connected to the battery in the two-wheeled vehicle in a detachable manner, and is used to charge the battery; the charging pile is provided with an ambient temperature sensor for detecting the ambient temperature; the battery is provided with a management system, and the management system stores battery coding information; the battery cell is provided with a first temperature sensor for detecting the battery cell temperature, and the first temperature sensor transmits the collected battery cell temperature data to the management system; The low voltage and high current fast charging device comprises: The battery cell temperature acquisition module is used to obtain the current battery cell temperature at the current moment; The ambient temperature acquisition module is used to obtain the current ambient temperature at the current moment; A temperature trend determination module, used to determine the temperature change trend according to the current battery cell temperature and the historical battery cell temperature; A first adjustment module, used to determine a first current adjustment coefficient of a charging current used by the charging pile to charge the battery according to the temperature change trend; a second adjustment module, configured to correct the first current adjustment coefficient according to an initial current to obtain a second current adjustment coefficient; the initial current is determined according to the current ambient temperature, the battery cell model of the battery, and the pre-acquired internal resistance information of the battery, and the battery cell model is determined according to the battery coding information; A third adjustment module, configured to correct the second current adjustment coefficient according to the current ambient temperature to obtain a third current adjustment coefficient; The output control module is used to adjust the charging current according to the third current adjustment coefficient.

[0006] The low-voltage, high-current fast charging method and device of the embodiment of the present application can effectively reduce the charging voltage by adopting a low-voltage, high-current charging method, thereby improving safety during use. Compared with high voltage, it can reduce the protection requirements for the charging gun connection cable. At the same time, the embodiment of the present application controls the charging current by comprehensively considering data such as the initial current, ambient temperature, and battery internal resistance, so that while providing high-power charging, it can reduce the problem of excessive temperature rise caused by high-current charging, providing a basis for safe charging.

[0007] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 A flowchart of an embodiment of a low voltage and high current fast charging method provided by the present application; Figure 2 A schematic diagram of the structure of an embodiment of a low voltage and high current fast charging device provided in the present application.

[0009] A low voltage and high current fast charging device 100; a battery cell temperature acquisition module 110; an ambient temperature acquisition module 120; a temperature trend determination module 130; a first adjustment module 140; a second adjustment module 150; a third adjustment module 160; and an output control module 170. DETAILED DESCRIPTION

[0010] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0011] In the description of this application, if there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0012] In the description of the present application, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0013] In the description of this application, it should be noted that, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meaning of the above terms in this application based on the specific content of the technical solution.

[0014] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described below are only part of the embodiments of the present application, not all of the embodiments.

[0015] In order to better describe the low-voltage, high-current fast charging method and device of the embodiments of the present application, the embodiments of the present application propose a two-wheeled vehicle charging pile, which is detachably electrically connected to the battery in the two-wheeled vehicle and is used to charge the battery; the charging pile is provided with an ambient temperature sensor for detecting the ambient temperature; a management system is provided in the battery, in which battery coding information is stored, and a first temperature sensor for monitoring the battery cell temperature is provided at the battery cell, and the first temperature sensor transmits the collected battery cell temperature data to the management system.

[0016] The battery management system is provided in the above-mentioned two-wheeled vehicle battery, and the battery management system includes a battery controller, a battery side charging circuit, etc. The battery side charging circuit includes a large number of power devices, such as MOS tubes, etc., so as to realize the charging of the battery. The storage unit in the battery controller can write the battery coding information. In the embodiment of the present application, the battery management system can be constructed based on the BMS system.

[0017] The battery coding information in the above two-wheeled vehicle battery is unique, that is, the battery coding information in each two-wheeled vehicle is different.

[0018] The charging pile is provided with a charging pile controller and a charging circuit. The charging pile controller adjusts the output power by adjusting the output current of the charging circuit.

[0019] The above charging pile is provided with an ambient temperature sensor, and the ambient temperature can be collected through the ambient temperature sensor. In the embodiment of the present application, the charging pile is in the same environment as the two-wheeled vehicle when charging, so the result detected by the temperature environment sensor can be directly used as the ambient temperature of the battery.

[0020] A first temperature sensor is provided at the battery cell, through which the battery cell temperature can be monitored. The battery cell temperature can directly and intuitively reflect the safety of the battery. By regulating the battery cell temperature, accidents caused by high temperature can be reduced to a certain extent.

[0021] The following describes the low-voltage, high-current fast charging method and apparatus of the embodiments of the present application based on the above-mentioned device output system.

[0022] See also Figure 1 As shown, Figure 1 : is a flow chart of a low voltage and high current fast charging method provided by an embodiment of the present application, the low voltage and high current fast charging method comprising: Get the current battery cell temperature at the current moment; Get the current ambient temperature at the current moment; Get the current charging current of the charging pile charging the battery at the current moment; Determine the temperature change trend based on the current cell temperature and historical cell temperature; Determine a first current adjustment coefficient of the charging current used by the charging pile to charge the battery according to the temperature change trend; The first current adjustment coefficient is corrected according to the initial current and the current charging current to obtain the second current adjustment coefficient; the initial current is determined according to the current ambient temperature, the battery cell model, and the pre-acquired internal resistance information of the battery, and the battery cell model is determined according to the battery coding information; Correcting the second current adjustment coefficient according to the current ambient temperature to obtain a third current adjustment coefficient; The charging current is adjusted according to the third current adjustment coefficient.

[0023] In the embodiment of the present application, by adopting a low voltage and high current charging method, the charging voltage can be effectively reduced, thereby improving the safety during use. Compared with high voltage, the protection requirements for the charging gun connection cable can be reduced. At the same time, the embodiment of the present application controls the charging current by comprehensively considering the initial current, ambient temperature, battery internal resistance and other data, so that while providing high-power charging, it can reduce the problem of excessive temperature rise caused by high-current charging, providing a basis for safe charging.

[0024] The above-mentioned improvement in safety during use is mainly due to the fact that the frequency of use of electric two-wheeled vehicle charging piles is much higher than that of electric four-wheeled vehicles, and the people they face are diverse, there is the possibility of incorrect use and cable damage, and the use of low voltage can greatly reduce the safety problems caused by risks. However, when using low-voltage charging, in order to increase the charging power, the charging current needs to be increased. When the current is large, the heating of the battery will be more serious. Therefore, it is necessary to effectively monitor the heating of the battery.

[0025] The above data acquisition process and control process need to be carried out after the charging gun of the charging pile is connected to the electric two-wheeled vehicle.

[0026] The above-mentioned current battery core temperature is the temperature detected by the first temperature sensor at the current moment.

[0027] The above current ambient temperature is the temperature detected by the ambient temperature sensor at the current moment.

[0028] The above-mentioned current charging current is the current detected by the current sensor at the current moment when the charging gun charges the battery.

[0029] The above temperature change trend can be obtained through the current temperature and the historical cell temperature. The historical cell temperature is the temperature collected before the current moment during this charging process, which can be the temperature within a time period, such as 30 seconds, one minute, etc. The number of temperature data in the historical cell temperature is determined by the frequency of data storage and the length of time for data storage.

[0030] The above-mentioned first current adjustment coefficient is determined by the temperature change trend. For example, if the temperature change trend indicates that the temperature is rising, it is necessary to appropriately reduce the charging current, reduce the temperature rise rate, or even reduce the temperature, and the faster the temperature rises, the more the charging current is reduced; if the temperature change trend indicates that the temperature is falling, it is necessary to appropriately increase the charging current, reduce the cooling rate, or even increase the temperature, and the faster the cooling, the more the charging current is increased. It should be noted that there is a safety upper limit for the charging current. When it is higher than the upper limit, if there is still a temperature drop trend, there may be a first temperature sensor failure or the ambient temperature is too low. At this time, you can stop charging first, and retrieve historical data to manually determine whether there is a sensor failure, and determine whether the ambient temperature is too low through the collected ambient temperature. If the ambient temperature is too low, you only need to determine that the battery cell temperature is not lower than the preset battery cell low threshold temperature value, and then you can continue to charge. At this time, you can assign a fixed value to the first current adjustment coefficient, for example, directly assign a value of 1, and directly ignore the impact of temperature changes.

[0031] The above initial current is the theoretical optimal temperature for the charging pile to start charging the battery. After charging starts, the charging pile will gradually increase the charging current to keep the current charging current as close to the initial current as possible.

[0032] The above initial current is determined by the current ambient temperature, the battery cell model, and the pre-acquired internal resistance information of the battery. The current ambient temperature can reflect to a certain extent whether the environment will have a cooling or heating effect; the battery cell model indicates the theoretical upper and lower limits of the battery charging and the optimal charging current; the internal resistance information can reflect the battery attenuation and can intuitively reflect the temperature rise of the battery itself.

[0033] The above-mentioned battery cell model is determined according to the battery coding information. The battery information will be entered and the battery coding information will be entered synchronously for each battery and each user, and the information will be stored in the cloud. Therefore, after obtaining the battery coding information of each battery, the battery cell signal information can be quickly determined.

[0034] The second current adjustment coefficient is determined based on the initial current and the current charging current. The greater the difference between the initial current and the current charging current, the greater the influence of the current on the temperature, and the current charging current needs to be adjusted.

[0035] The third current adjustment coefficient is obtained by correcting the second current adjustment coefficient based on the current ambient temperature. After the initial current setting is completed, the difference between the ambient temperature and the battery cell temperature will change dynamically, which also represents the ability of the ambient temperature to cool down or increase the battery cell temperature. Based on this principle, the second current adjustment coefficient can be further corrected.

[0036] The above-mentioned third current adjustment coefficient comprehensively considers factors such as the temperature change trend of the battery cell temperature, the difference between the initial current and the current charging current, and the difference between the current ambient temperature and the battery cell temperature. Therefore, when the battery cell temperature fluctuates, the battery cell temperature change can be suppressed by quickly adjusting the charging current, thereby avoiding the battery cell temperature from rising or falling for a long time as much as possible, thereby improving the safety in the low-voltage and high-current charging mode. In addition, because the capacity of the rechargeable battery of a two-wheeled vehicle is smaller than that of a four-wheeled vehicle, the occurrence of over-temperature of the battery cell can be greatly reduced, and there is no need to add active structures such as air cooling and liquid cooling to cool the battery.

[0037] The influence of the temperature change trend of the above-mentioned battery cell temperature, the difference between the initial current and the current charging current, and the difference between the current ambient temperature and the battery cell temperature can be achieved by pre-setting the adjustment range. For example, the first current adjustment coefficient to the third current adjustment coefficient can take values ​​of 0.8 to 1.2, that is, the fluctuation is plus or minus 0.2. Each time the coefficient is adjusted, the final third current adjustment coefficient can be obtained by continuous multiplication. In fact, the first current adjustment coefficient to the third current adjustment coefficient may be different due to different abilities to affect the battery cell temperature. For example, the first current adjustment coefficient can be 0.8 to 1.2, and the third current adjustment coefficient can be 0.9 to 1.1. It should be noted that for different charging piles and / or for different batteries, the coefficient values ​​can be adaptively adjusted, which can be pre-stored in the cloud and then obtained through networking during charging.

[0038] In some embodiments, determining the temperature change trend according to the current battery cell temperature and the historical battery cell temperature includes: Get the historical battery cell temperature of the preset trend judgment time length before the corresponding moment of the current battery cell temperature; Construct a temperature change curve based on historical battery cell temperature and current battery cell temperature; Based on the temperature change curve, the curve change rate corresponding to the current battery cell temperature is determined to obtain the temperature change trend.

[0039] The above historical battery cell temperature is the temperature collected before the current moment during this charging process. In this embodiment, the duration of the stored temperature data is the preset trend judgment time length, which can be adjusted according to actual needs, such as 30S, one minute, etc. The amount of temperature data within the preset trend judgment time length is determined by the frequency of data storage and the time length of data storage.

[0040] In this embodiment, a temperature change curve is constructed using the current battery cell temperature and the historical battery cell temperature, and the temperature change curve is used to determine the curve change rate corresponding to the current battery cell temperature at a certain moment to determine the temperature change trend. This method of constructing a curve to determine the temperature change trend can better determine the temperature change trend than the method of determining the temperature change trend using discrete points.

[0041] In the process of constructing the above temperature change curve, the historical battery cell temperature can be subjected to error filtering to eliminate the influence of some data with large deviations on the curve construction. At the same time, the current battery cell temperature can also be obtained by collecting data within a period of time before and after the current moment and calculating the average value, thereby reducing the error caused by single data collection.

[0042] In some embodiments, determining a first current adjustment coefficient of a charging current used by a charging pile to charge a battery according to a temperature change trend includes: Determining a first adjustment direction according to a changing direction of the temperature changing trend, wherein the changing direction of the temperature changing trend is opposite to the first adjustment direction; The first adjustment value is determined according to the magnitude of the temperature change trend, wherein the magnitude of the temperature change trend is positively correlated with the first adjustment value, and the first adjustment direction and the first adjustment value constitute a first current adjustment coefficient.

[0043] The above-mentioned temperature change trend may include an upward trend and a downward trend. In the case of an upward trend, it is necessary to appropriately reduce the charging current, reduce the temperature rise rate, or even reduce the temperature. In the case of a downward trend, it is necessary to appropriately increase the charging current, reduce the temperature drop rate, or even increase the temperature. Based on this principle, the first adjustment direction of the charging current can be determined, that is, whether to continue to increase the current, reduce the current, or maintain the current. After determining the adjustment direction, the size of the temperature change trend is further considered. The faster the temperature rise, the more the charging current is reduced, and the faster the temperature drops, the more the charging current is increased. Based on this principle, the first adjustment value can be determined.

[0044] In some implementations, the first current adjustment coefficient is corrected according to the initial current and the current charging current to obtain the second current adjustment coefficient, including: Determine a second adjustment direction according to a current difference between the initial current and the current charging current, wherein the positive and negative values ​​of the current difference are opposite to the second adjustment direction; The second adjustment value is determined according to the magnitude of the current difference, wherein the magnitude of the current difference is positively correlated with the second adjustment value, and the second adjustment direction and the second adjustment value constitute a second current adjustment coefficient.

[0045] The above current difference can be a positive value or a negative value. In the case of a positive value, that is, the current charging current is less than the initial current, the charging current needs to be appropriately increased. In the case of a negative value, that is, the current charging current is greater than the initial current, the charging current needs to be appropriately reduced. Based on this principle, the second adjustment direction of the charging current can be determined, that is, whether to continue to increase the current, reduce the current, or maintain the current. After determining the adjustment direction, the size of the current difference is further considered. The larger the negative difference, the more the charging current is reduced, and the larger the positive difference, the more the charging current is increased. Based on this principle, the second adjustment value can be determined.

[0046] In some embodiments, the initial current is obtained by the following steps: Generate a cell query message according to the battery coding information, and send the cell query message to the cloud, so that the cloud determines the cell type information of the battery according to the battery coding information; Determine a first basic current according to a battery cell model, wherein there are multiple battery cell models and they are all different, and multiple different battery cell models correspond to different first basic currents; According to the initial temperature difference between the current ambient temperature and the preset suitable charging temperature, the first basic current is corrected to obtain the second basic current, and the initial temperature difference is negatively correlated with the correction amount of the first basic current; The second basic current is corrected according to the initial resistance information of the battery and the initial internal resistance difference of the internal resistance information obtained in advance to obtain the initial current, and the initial internal resistance difference is negatively correlated with the correction amount of the second basic current.

[0047] The above battery coding information can be obtained after the charging pile is connected to the charging gun, and then the battery coding information can be used to generate a battery cell query message.

[0048] The above-mentioned cloud will store the battery coding information of all batteries purchased by users, so that after obtaining the battery coding information, the cloud can obtain all information stored in the cloud corresponding to the battery coding information based on the battery coding information. Therefore, as long as the battery cell type information corresponding to each battery coding information is stored in the cloud in advance, the battery cell type information can be obtained later through the battery coding information. The battery cell type information itself is also information that can be determined in advance, and there is no difficulty in obtaining it.

[0049] The above-mentioned battery cell query message can be sent to the cloud through the charging pile. After receiving the battery cell query message, the cloud can parse the battery cell query message to obtain the battery coding information, and then use the battery coding information to determine the corresponding battery cell type information, and the obtained battery cell type information can be sent to the charging pile.

[0050] The above cell type information can determine the type of battery. Different types of batteries may have different tolerable charging currents. Therefore, it is necessary to first determine the first basic current using the cell type information.

[0051] The above initial temperature difference is obtained by performing a difference calculation between the current ambient temperature and the preset suitable charging temperature. A positive initial temperature difference indicates a greater heating capacity for the battery, and a negative initial temperature difference indicates a greater cooling capacity for the battery. Therefore, the first basic current can be corrected by the initial temperature difference to obtain the second basic current.

[0052] The above preset suitable charging temperature can be determined according to different regions and different battery cell types, and stored in the cloud in advance.

[0053] The above initial internal resistance difference is obtained by performing a difference calculation on the initial resistance information of the battery and the internal resistance information obtained in advance. The internal resistance can indicate whether the battery is attenuated to a certain extent, and the internal resistance usually increases gradually with the use time. The larger the initial internal resistance difference, the more heat the battery will generate under the same charging current, and the larger the initial internal resistance difference, the more attenuation there is, and the more the charging current needs to be reduced. Therefore, the second basic current can be corrected by the initial internal resistance difference to obtain the initial current.

[0054] In some implementations, the second current adjustment coefficient is corrected according to the current ambient temperature to obtain the third current adjustment coefficient, including: Determine the real-time temperature difference between the battery cell temperature and the current ambient temperature; The second current adjustment coefficient is corrected according to the real-time temperature difference to obtain a third current adjustment coefficient, wherein the real-time temperature difference is negatively correlated with a correction amount of the second current adjustment coefficient.

[0055] In this embodiment, it is further considered that the temperature of the battery cell will change during use, so the ability of the ambient temperature to passively cool the battery will also change, so that the real-time temperature difference can be used to correct the second current adjustment coefficient to obtain a more accurate third current adjustment coefficient.

[0056] If the above real-time temperature difference is positive and the value is larger, it means that the passive cooling ability of the ambient temperature is stronger. At this time, the second current adjustment coefficient can be increased. If the real-time temperature difference is negative and the value is larger, it means that the passive heating ability of the ambient temperature is stronger. At this time, the second current adjustment coefficient can be reduced.

[0057] In some embodiments, the low voltage and high current fast charging method further includes: When the current battery cell temperature exceeds the preset battery cell high threshold temperature, the charging current is reduced to the preset safe charging current.

[0058] In this implementation, the preset battery cell high threshold temperature can be understood as a temperature safety threshold. When this value is exceeded, a fire may easily occur due to high temperature. Therefore, when the current battery cell temperature exceeds the preset battery cell high threshold temperature, the dynamic temperature adjustment method is no longer adopted. Instead, the charging current is directly lowered to the preset safe charging current to provide the maximum cooling effect under safe conditions.

[0059] In some embodiments, the low voltage and high current fast charging method further includes: When the current battery cell temperature exceeds the preset battery cell high threshold temperature and the duration reaches the preset battery cell high threshold time length, the charging pile is controlled to stop outputting the charging current.

[0060] In this embodiment, the preset cell high threshold temperature can be understood as a temperature safety threshold. When this value is exceeded, a fire is likely to occur due to high temperature. Therefore, when the current cell temperature exceeds the preset cell high threshold temperature, the temperature is no longer dynamically adjusted, but the charging current is directly adjusted down to the preset safe charging current to provide the maximum cooling effect under safe conditions. However, in some cases, even if the charging current is reduced to the preset safe charging current, the temperature cannot be reduced. At this time, if the duration is too long, charging needs to be stopped in time to avoid fire.

[0061] In some embodiments, a second temperature sensor is provided at a power component in the battery that charges the battery, and the second power sensor is used to collect the temperature of the power component. The low-voltage and high-current fast charging method also includes: Get the current power component temperature of the power component; When the current power component temperature exceeds the preset cell high threshold temperature, the charging current is reduced to the preset safe charging current.

[0062] The power components can be a large number of power MOS tubes. A power board is provided in the battery, and a power component is provided on the power board to control the charging current. The power MOS tubes will generate heat, so there may be a dangerous situation caused by high temperature.

[0063] In this embodiment, when the power component exceeds the preset cell high threshold temperature, the charging current is adjusted down to a preset safe charging current, and the preset safe charging current can be adjusted according to different batteries.

[0064] In some embodiments, a second temperature sensor is provided at a power component in the battery that charges the battery, and the second power sensor is used to collect the temperature of the power component. The low-voltage and high-current fast charging method also includes: Get the current power component temperature of the power component; When the current power component temperature exceeds the preset component high threshold temperature and the duration reaches the preset component high threshold time length, the charging pile is controlled to stop outputting the charging current.

[0065] In this embodiment, when the power component exceeds the preset battery cell high threshold temperature, the charging current can be lowered to the preset safe charging current. However, if the high temperature persists even after the charging current is reduced, it means that good cooling cannot be achieved even if the charging current is lowered. At this time, the charging pile can be controlled to stop outputting the charging current.

[0066] In some embodiments, the output voltage range of the charging pile is 68 V to 78 V. The charging voltage of 68 V to 78 V can still provide a large charging power when the charging voltage is reduced. At this time, the charging current can reach about 100 A, which is enough to complete the charging of ordinary electric vehicle batteries in about ten minutes.

[0067] In some embodiments, the low voltage and high current fast charging method further includes: If the battery coding information is not detected, the charging pile is controlled to stop charging.

[0068] In this embodiment, the battery coding information is used as verification information. When the battery coding information is not found in the battery coding information stored in the cloud, or the battery does not carry the battery coding information, charging can be stopped directly to avoid safety accidents or disputes.

[0069] The low voltage and high current fast charging method provided in the embodiment of the present application can be performed by a low voltage and high current fast charging device 100. In the embodiment of the present application, the low voltage and high current fast charging method performed by the low voltage and high current fast charging device 100 is taken as an example to illustrate the low voltage and high current fast charging device 100 provided in the embodiment of the present application.

[0070] like Figure 2 As shown, the embodiment of the present application also provides a low voltage and high current fast charging device, and the low voltage and high current fast charging device 100 includes: The battery cell temperature acquisition module 110 is used to acquire the current battery cell temperature at the current moment; The ambient temperature acquisition module 120 is used to acquire the current ambient temperature at the current moment; A temperature trend determination module 130 is used to determine a temperature change trend according to the current battery cell temperature and the historical battery cell temperature; A first adjustment module 140, configured to determine a first current adjustment coefficient of a charging current used by a charging pile to charge a battery according to a temperature change trend; The second adjustment module 150 is used to correct the first current adjustment coefficient according to the initial current to obtain the second current adjustment coefficient; the initial current is determined according to the current ambient temperature, the battery cell model, and the pre-acquired internal resistance information of the battery, and the battery cell model is determined according to the battery coding information; A third adjustment module 160, configured to correct the second current adjustment coefficient according to the current ambient temperature to obtain a third current adjustment coefficient; The output control module 170 is used to adjust the charging current according to the third current adjustment coefficient.

[0071] The low-voltage, high-current fast charging device 100 in the embodiment of the present application can be an electronic device or a component in an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal or other devices other than a terminal. Exemplarily, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (Ultra-mobile per Sonal Computer, UMPC), a netbook or a personal digital assistant (per Sonal digital asSiStant, PDA), etc. It can also be a server, a network attached storage (Network AttaChed Storage, NAS), a personal computer (per Sonal Computer, PC), a television (teleViSion, tV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

[0072] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0073] The functional blocks shown in the above structural block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier. "Machine-readable medium" may include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0074] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0075] Aspects of the present disclosure are described above with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the functions / actions specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be a general-purpose processor, a special-purpose processor, a special application processor or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0076] The above are only specific implementation methods of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A low voltage and high current fast charging method, characterized in that: Applied to a charging pile, the charging pile is detachably electrically connected to the battery in the two-wheeled vehicle, and is used to charge the battery; the charging pile is provided with an ambient temperature sensor for detecting the ambient temperature; the battery is provided with a management system, the management system stores battery coding information, and the battery cell is provided with a first temperature sensor for detecting the battery cell temperature, and the first temperature sensor transmits the collected battery cell temperature data to the management system; When the charging pile is electrically connected to the battery, the low-voltage and high-current fast charging method includes: Get the current battery cell temperature at the current moment; Get the current ambient temperature at the current moment; Obtaining the current charging current of the battery being charged by the charging pile at the current moment; Determining a temperature change trend according to the current battery cell temperature and the historical battery cell temperature; Determine a first current adjustment coefficient of a charging current used by the charging pile to charge the battery according to the temperature change trend; The first current adjustment coefficient is corrected according to the initial current and the current charging current to obtain a second current adjustment coefficient; the initial current is determined according to the current ambient temperature, the battery cell model of the battery, and the pre-acquired internal resistance information of the battery, and the battery cell model is determined according to the battery coding information; Correcting the second current adjustment coefficient according to the current ambient temperature to obtain a third current adjustment coefficient; The charging current is adjusted according to the third current adjustment coefficient.

2. The low voltage and high current fast charging method according to claim 1, characterized in that: The determining of the temperature change trend according to the current battery cell temperature and the historical battery cell temperature includes: Obtain the historical battery cell temperature of a preset trend judgment time length before the corresponding moment of the current battery cell temperature; Constructing a temperature change curve according to the historical battery cell temperature and the current battery cell temperature; The curve change rate corresponding to the current battery core temperature at the moment is determined based on the temperature change curve to obtain the temperature change trend.

3. The low voltage and high current fast charging method according to claim 1, characterized in that: The determining, according to the temperature change trend, a first current adjustment coefficient of the charging current used by the charging pile to charge the battery comprises: determining a first adjustment direction according to a changing direction of the temperature changing trend, wherein the changing direction of the temperature changing trend is opposite to the first adjustment direction; A first adjustment value is determined according to the magnitude of the temperature change trend, wherein the magnitude of the temperature change trend is positively correlated with the first adjustment value, and the first adjustment direction and the first adjustment value constitute the first current adjustment coefficient.

4. The low voltage and high current fast charging method according to claim 1, characterized in that: The step of correcting the first current adjustment coefficient according to the initial current and the current charging current to obtain the second current adjustment coefficient includes: Determining a second adjustment direction according to a current difference between the initial current and the current charging current, wherein the positive and negative values ​​of the current difference are opposite to the second adjustment direction; A second adjustment value is determined according to the magnitude of the current difference, wherein the magnitude of the current difference is positively correlated with the second adjustment value, and the second adjustment direction and the second adjustment value constitute the second current adjustment coefficient.

5. The low voltage and high current fast charging method according to claim 1, characterized in that: The initial current is obtained by the following steps: Generate a cell query message according to the battery coding information, and send the cell query message to the cloud, so that the cloud determines the cell type information of the battery according to the battery coding information; Determine a first basic current according to the battery cell model, wherein the battery cell models are multiple and all are different, and the multiple different battery cell models correspond to different first basic currents; According to the initial temperature difference between the current ambient temperature and the preset suitable charging temperature, the first basic current is corrected to obtain a second basic current, wherein the initial temperature difference is negatively correlated with a correction amount of the first basic current; The second basic current is corrected according to the pre-acquired battery initial resistance information and the initial internal resistance difference of the internal resistance information to obtain the initial current, and the initial internal resistance difference is negatively correlated with the correction amount of the second basic current.

6. The low voltage and high current fast charging method according to claim 1, characterized in that: The step of correcting the second current adjustment coefficient according to the current ambient temperature to obtain a third current adjustment coefficient includes: Determine a real-time temperature difference between the battery core temperature and the current ambient temperature; The second current adjustment coefficient is corrected according to the real-time temperature difference to obtain a third current adjustment coefficient, wherein the real-time temperature difference is negatively correlated with a correction amount of the second current adjustment coefficient.

7. The low voltage and high current fast charging method according to claim 1, characterized in that: The output voltage range of the charging pile is 68V to 78V.

8. A low voltage and high current fast charging device, characterized in that: Applied to a charging pile, the charging pile is detachably electrically connected to the battery in the two-wheeled vehicle, and is used to charge the battery; the charging pile is provided with an ambient temperature sensor for detecting the ambient temperature; the battery is provided with a management system, the management system stores battery coding information, and the battery cell is provided with a first temperature sensor for detecting the battery cell temperature, and the first temperature sensor transmits the collected battery cell temperature data to the management system; The low voltage and high current fast charging device comprises: The battery cell temperature acquisition module is used to obtain the current battery cell temperature at the current moment; The ambient temperature acquisition module is used to obtain the current ambient temperature at the current moment; A temperature trend determination module, used to determine the temperature change trend according to the current battery cell temperature and the historical battery cell temperature; A first adjustment module, used to determine a first current adjustment coefficient of a charging current used by the charging pile to charge the battery according to the temperature change trend; a second adjustment module, configured to correct the first current adjustment coefficient according to an initial current to obtain a second current adjustment coefficient; the initial current is determined according to the current ambient temperature, the battery cell model of the battery, and the pre-acquired internal resistance information of the battery, and the battery cell model is determined according to the battery coding information; A third adjustment module, configured to correct the second current adjustment coefficient according to the current ambient temperature to obtain a third current adjustment coefficient; The output control module is used to adjust the charging current according to the third current adjustment coefficient.

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