Charging current control method and device, storage medium and program product

Abstract

The invention provides a charging current control method and device, a storage medium and a program product, and the control method comprises the steps: determining the impedance and / or temperature rise rate between a charging plug and a charging socket, and determining a target control strategy according to the impedance and / or temperature rise rate, and controlling the charging current output by the charging device according to the target control strategy. According to the control method provided by the invention, different control strategies are selected based on the impedance to control the current, so that the charging current output by the charging device can be controlled more timely and effectively, the problem that the temperature between the charging socket and the charging plug is too high is avoided, and the safety performance of the battery during charging is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric energy storage systems, and in particular to a charging current control method, device, storage medium, and program product. Background Art

[0002] During the battery charging process, the temperature of the contact point between the charging socket connected to the battery and the charging plug of the charging device will change with the charging current, environmental factors, etc. The control circuit provided in some technologies can be used to detect the temperature between the charging socket and the charging plug. When the temperature is too high, the charging device is promptly controlled to reduce its output charging current according to the current control strategy to avoid more serious safety problems caused by the continuous rise in temperature.

[0003] In the prior art, when there is foreign matter between the charging socket and the charging plug or when there is wear and aging, the temperature of the charging socket and the charging plug rises rapidly. The control circuit cannot timely control the current value of the charging current output by the charging device according to the current control strategy, resulting in the temperature between the charging socket and the charging plug being too high, affecting the safety performance of the battery during charging. Summary of the Invention

[0004] The present application provides a charging current control method, device, storage medium and program product to overcome the problem of excessive temperature between the charging socket and the charging plug when the battery is charging.

[0005] In a first aspect, the present application provides a charging current control method, comprising: determining charging status parameters between a charging socket and a charging plug of a charging device, the charging status parameters including impedance and / or temperature rise rate; determining a target control strategy based on the impedance and / or the temperature rise rate; and controlling the charging current output by the charging device based on the target control strategy.

[0006] The second aspect of the present application provides an electronic device comprising: a memory and a processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory, so that the processor executes the method described in the first aspect of the present application.

[0007] A third aspect of the present application provides a computer-readable storage medium storing computer-executable instructions, which, when executed, implement the method described in the first aspect of the present application.

[0008] A fourth aspect of the present application provides a computer program product, comprising a computer program, which implements the method described in the first aspect of the present application when executed.

[0009] In summary, the present application provides a charging current control method, device, storage medium, and program product, wherein the control method includes determining the impedance and / or temperature rise rate between the charging plug and the charging socket, and determining a target control strategy based on the impedance and / or temperature rise rate, thereby controlling the charging current output by the charging device according to the target control strategy. Selecting different control strategies based on impedance to control the current enables more timely and effective control of the charging current output by the charging device, avoiding the problem of excessive temperature between the charging socket and the charging plug, and improving the safety performance of the battery during charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0011] Figure 1 A schematic diagram of an application scenario provided in an embodiment of the present application;

[0012] Figure 2 A schematic diagram of a control circuit for adjusting the current value of a charging current;

[0013] Figure 3 A schematic diagram of the mapping relationship corresponding to the first control strategy provided in this application;

[0014] Figure 4 A flow chart of an embodiment of a charging current control method provided by the present application;

[0015] Figure 5 A schematic diagram of the mapping relationship corresponding to the second control strategy provided in this application;

[0016] Figure 6 A schematic diagram of a flow chart of an embodiment of controlling a current value by a control circuit provided in the present application;

[0017] Figure 7 A schematic diagram of another application scenario provided by an embodiment of the present application;

[0018] Figure 8 A flow chart of another embodiment of the charging current control method provided by the present application;

[0019] Figure 9 A schematic structural diagram of a charging current control device provided in this application;

[0020] Figure 10This is a structural diagram of a charging current control device provided in this application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0022] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the numbers used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] Figure 1 A schematic diagram of an application scenario provided in an embodiment of the present application is shown in FIG. Figure 1 The charging device 2 shown can be used to charge the battery. Figure 1 In the example shown, the charging device 2 can be used to charge the battery 12 of the vehicle 1. It will be appreciated that the charging device 2 can also be used to charge the batteries of other devices.

[0024] exist Figure 1 In the example shown, vehicle 1 includes a charging socket 10, a control circuit 11, a battery 12, and a temperature detection circuit 13. Charging device 2 includes a charging plug 20 and a host 21. Vehicle 1 may be an electric vehicle, charging device 2 may be a charging station, and control circuit 11 may be the battery management system (BMS) of vehicle 1.

[0025] When charging plug 20 is inserted into charging socket 10, a connection is established between the two terminals. This connection includes at least the A and B connections shown in the figure. For easier identification, connection A is represented by a thicker solid line, and connection B by a thinner solid line. Connection A is a direct current (DC) connection, specifically including a DC positive (DC+) and a DC negative (DC-) connection. Charging current is transmitted between the charging plug 20 and the charging socket 10 via connection A. Connection B is a CAN bus connection. Data can be transmitted between the charging plug 20 and the charging socket 10 via connection B.

[0026] In one embodiment, the control circuit 11 sends charging request information to the host 21 through the B connection between the charging socket 10 and the charging plug 20. The host 21 provides a charging current to the battery 12 through the A connection between the charging plug 20 and the charging socket 10 based on the received charging request information, thereby enabling the charging device 2 to output the charging current to the vehicle 1 to charge the battery 12 of the vehicle 1.

[0027] In one embodiment, the charging request information may include the current value of the requested charging current, and the host 21 may adjust the current value of the charging current output to the battery 12 according to the current value in the charging request information.

[0028] In one embodiment, the control circuit 11 can obtain the temperature value of the charging socket 10 through the temperature detection circuit 13, thereby controlling the current value of the charging current output by the charging device 2 according to the temperature value of the charging socket 10, and finally adjusting the current value of the charging current output by the host 21 to the battery 12.

[0029] For example, Figure 2 A schematic diagram of a control circuit adjusting the current value of the charging current, such as Figure 2 The method shown can be applied to Figure 1 In the scenario shown, the control circuit 11 executes, as shown in FIG. Figure 2 The control methods shown include:

[0030] S01: The control circuit 11 obtains the temperature value of the charging socket 10 from the temperature detection circuit 13 via connection C. The temperature detection circuit 13 may be a sensor, a negative temperature coefficient thermistor (NTC), or the like. The temperature detection circuit 13 may detect the temperature value of the charging socket 10 at regular detection intervals and transmit the information to the control circuit 11. Alternatively, the control circuit 11 may control the temperature detection unit 13 to detect the temperature value of the charging socket 10 at regular detection intervals.

[0031] S02: The control circuit 11 determines a scaling factor of the required charging current according to a mapping relationship between the temperature value obtained in S01 and a preset control strategy.

[0032] In one embodiment, the control strategy for controlling the current value of the charging current by the control circuit 11 includes: when the temperature is in a lower range, the current value is not adjusted or a smaller current limiting adjustment is made to the current value; when the temperature is in a higher range, the current value of the charging current is controlled to be 0, so as to timely avoid safety issues such as damage to the equipment caused by excessive temperature of the charging socket 10; when the temperature is between the higher range and the lower range, the current value can be adjusted according to the current limiting coefficient determined by the inverse proportional change relationship of the temperature value to slow down the temperature of the charging socket 10 and the temperature increase rate, so as to prevent the temperature from continuing to rise while ensuring charging efficiency.

[0033] Based on the above control strategy, the mapping relationship corresponding to the control strategy for controlling the current value of the charging current by the control circuit 11 includes: the corresponding relationship between different temperature values and scaling coefficients. For example, Figure 3 This is a schematic diagram of the mapping relationship corresponding to the first control strategy provided in this application, such as Figure 3 As shown, the mapping relationship of the first control strategy includes the correspondence between the temperature value T of the charging socket 10 and the current limiting coefficient Ik. The temperature range of the charging socket 10 can be divided into a continuous first temperature interval (0-Tm1), a second temperature interval (Tm1-Tn), and a third temperature interval (above Tn). The current limiting coefficient Ik in the first temperature interval has a first value, which can be 1. The current limiting coefficient in the second temperature interval is inversely proportional to the temperature value, varying linearly from 1 to Ik1. The current limiting coefficient in the third temperature interval has a second value, which can be 0.

[0034] The control circuit 11 determines the corresponding current limiting coefficient Ik according to the temperature value, and determines the current value that needs to be adjusted by multiplying the current limiting coefficient Ik by the current value before the charging current is adjusted. Figure 3 As can be seen, if the current temperature of the charging socket 10 is low and less than Tm1, the current limiting coefficient Ik = 1, and the adjusted current value is calculated. In this case, the current values before and after adjustment are the same. If the current temperature of the charging socket 10 is greater than Tm1 and less than Tn, the current limiting coefficient is determined based on the inverse proportional relationship of the linear change within the second temperature range, and the adjusted current value is calculated. If the current temperature of the charging socket 10 is greater than Tn, the current limiting coefficient Ik = 0, and the adjusted current value is also calculated to be 0. In this case, the control circuit 11 can control the charging device 2 to stop transmitting the charging current.

[0035] S03 : The control circuit 11 calculates a current value according to the scaling factor determined in S02 , and controls the current value of the charging current output by the charging device 2 to the battery 12 through the connection A between the charging plug 20 and the charging socket 10 .

[0036] In one embodiment, the control circuit 11 can send charging request information to the host 21 of the charging device 2 through the B connection between the charging socket 10 and the charging plug 20, so that the host 21 adjusts the current value of the charging current from the current value before adjustment to the adjusted current value according to the adjusted current value in the charging request information.

[0037] In some scenarios, when there is foreign matter or severe wear between the charging socket 10 and the charging plug 20, the impedance between the charging socket 10 and the charging plug 20 increases. When charging current is transmitted between the charging socket 10 and the charging plug 20, the impedance between the charging socket 10 and the charging plug 20 will generate more heat, causing the temperature of the charging socket 10 and the charging plug 20 to be higher and to heat up faster.

[0038] for Figure 1-Figure 3 In the vehicle 1 and charging device 2 shown, although the control circuit 11 controls the charging current output by the charging device 2 according to the temperature value of the charging socket 10 through the first control strategy, since the control circuit 11 only controls according to the preset first control strategy, once the impedance between the charging socket 10 and the charging plug 20 increases, the first control strategy cannot promptly and effectively control the current value of the charging current output by the charging device 2. For example, when the temperature of the charging socket 10 is close to Tm1, the temperature rise rate is already very fast, but due to Figure 3 The corresponding current limiting coefficient in the first control strategy shown is 1, so the charging device 2 cannot reduce the current value of the charging current it outputs, resulting in a continuous and rapid increase in the temperature between the charging socket 10 and the charging plug 20. Ultimately, when the temperature of the charging socket 10 and the charging plug 20 is too high, the safety performance of the battery 12 during charging is seriously affected.

[0039] Based on this, the present application provides a charging current control method. By selecting different control strategies, the control circuit 11 of the vehicle 1 can more promptly and effectively control the current value of the charging current output by the charging device 2 in different scenarios to ensure the safety performance of the battery 12 during charging. The technical solution of the present application is described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0040] Figure 4 This is a flow chart of an embodiment of the charging current control method provided by the present application, as shown in FIG. Figure 4The method described can be applied to Figure 1 In the scenario shown, it is executed by the control circuit 11. Specifically, Figure 4 The methods shown include:

[0041] S11: The control circuit 11 determines a target control strategy. Specifically, the battery 12 provided in this embodiment supports at least two charging current control strategies. The control circuit 11 can determine a control strategy that can be used for this charging from the at least two charging current control strategies, which is recorded as the target control strategy.

[0042] The following is an example of the battery 12 supporting two control strategies to illustrate the embodiment of the present application, wherein the two control strategies are recorded as the first control strategy and the second control strategy. The mapping relationship of the first control strategy is as follows Figure 3 As shown, no further details are given. Figure 5 This is a schematic diagram of the mapping relationship corresponding to the second control strategy provided in this application, such as Figure 5 The mapping relationship of the second control strategy shown is also divided into a continuous first temperature interval, a second temperature interval and a third temperature interval, wherein the starting temperature value Tm2 of the second temperature interval is Figure 3 Compared to the starting temperature Tm1 of the second temperature interval in the first control strategy shown, Tm2 < Tm1. Similarly, the current limiting coefficient within the second temperature interval is inversely proportional to the temperature, varying linearly from 1 to Ik2. That is, when the control circuit 11 controls the charging current based on the second control strategy, when the temperature of the charging socket 10 is between Tm1 and Tm2, a smaller current value adjusted according to the current limiting coefficient Ik is obtained, thereby enabling more timely processing of the current value at an earlier stage of the charging socket 10 temperature rise.

[0043] In one embodiment, if Figure 4 The method for determining the target control strategy shown specifically includes:

[0044] S101 : The control circuit 11 determines the impedance and / or temperature rise rate between the charging plug 10 and the charging socket 20 .

[0045] S102 : The control circuit 11 determines the target control strategy to be one of the first control strategy and the second control strategy according to the impedance and / or temperature rise rate determined in S101 .

[0046] S20 : The control circuit 11 controls the charging current output by the charging device 2 to the battery 12 according to the target control strategy determined in S11 .

[0047] For example, Figure 6 This is a flow chart of an embodiment of the control circuit provided in this application controlling the current value, as shown in FIG. Figure 6As shown, after determining the target control strategy, the control circuit 11 can determine the mapping relationship corresponding to the target control strategy in S201, obtain the temperature value between the charging plug 10 and the charging socket 20 in S202, and determine the current limiting coefficient according to the mapping relationship between the temperature value and the target control strategy in S203. Finally, in S203, the charging request information is sent to the host 21 through the B connection between the charging socket 10 and the charging plug 20, so that the host 21 adjusts the charging current output through the A connection from the initial current value to the real-time current value according to the real-time current value obtained according to the current limiting coefficient in the charging request information.

[0048] It is understandable that the control circuit 11 can execute once every preset time interval. Figure 6 The control method shown adjusts the current value of the charging current output by the charging device 2 to the battery 12. During the entire charging time of the battery 12, the charging current can be continuously controlled to ensure the stability of the charging current, thereby ensuring the safety during charging.

[0049] In summary, in the charging current control method provided in this embodiment, the battery 2 supports at least two charging current control strategies. The control circuit 11 determines the impedance and / or temperature rise rate between the charging plug 10 and the charging socket 20, and determines a target control strategy from the at least two charging current control strategies based on the impedance and / or temperature rise rate, thereby controlling the current value of the charging current output by the charging device 2 according to the determined target control strategy. In the charging current control method provided in this embodiment, the control circuit 11 can select different control strategies to control the current based on the impedance and / or temperature rise rate. This enables the control circuit 11 to more promptly and effectively control the current value of the charging current output by the charging device 2 in different scenarios. In particular, it avoids the problem of excessive temperature between the charging socket 10 and the charging plug 20 due to the inability to timely reduce the charging current according to a single control strategy when the impedance between the charging plug 10 and the charging socket 20 is high. This effectively improves the safety performance of the battery 12 during charging, reduces potential safety issues, and enhances the user experience.

[0050] Furthermore, since in the charging current control method provided in the embodiment of the present application, the control circuit 11 needs to determine the corresponding control strategy based on the impedance between the charging socket 10 and the charging plug 20, therefore, in one embodiment, when the charging plug 20 is inserted into the charging socket 10, the control circuit 11 can determine the impedance between the charging socket 10 and the charging plug 20.

[0051] In one embodiment, the control circuit 11 can receive the impedance between the charging socket 10 and the charging plug 20 sent by other devices or other circuits. The other devices or other circuits can be devices or circuits specifically used to detect impedance, thereby reducing the amount of calculation required by the control circuit 11 and improving the calculation speed and efficiency of determining the impedance and subsequently determining the target control strategy.

[0052] In another embodiment, the control circuit 11 can calculate the impedance between the charging socket 10 and the charging plug 20 based on circuit parameters such as the voltage and current of the charging socket 10 and the charging plug 20. In this case, the vehicle 1 and the charging device 2 are also respectively provided with a voltage detection circuit.

[0053] For example, Figure 7 A schematic diagram of another application scenario provided in an embodiment of the present application, such as Figure 7 The vehicle 1 is shown in Figure 1 The charging device 2 further includes a first voltage detection circuit 14, which can be used to detect the first voltage U1 of the charging socket 10 and send it to the control circuit 11 through the connection D1. Figure 1 The basis shown also includes a second voltage detection circuit 22, which can be used to detect the second voltage U2 of the charging plug 20 and send it to the host 21 through the connection D2.

[0054] When calculating impedance, the control circuit 11 first controls the charging device 2 to output an impedance-calculated current to the power battery 12 via connection A. After the charging plug 20 is inserted into the charging socket 10, the control circuit 11 can send an impedance-calculated current request to the host computer 21 via connection B, causing the host computer 21 to output an impedance-calculated current I1 to the battery 12 via connection A. The current value of the impedance-calculated current I1 is relatively small, at least less than the current value of the charging current. Subsequently, when the control circuit 11 determines that the current value of the impedance-calculated current I1 reaches or exceeds I1*95% and remains so for 5 seconds, the first voltage U1 of the charging socket 10 is obtained via the first voltage detection circuit 14, and the second voltage U2 sent by the host computer 21 is received via connection B. Finally, the control circuit 11 calculates the difference between the second voltage U2 and the first voltage U1, and calculates the ratio of this difference to the current value I1 of the impedance-calculated current to obtain the impedance R = (U2 - U1) / I1.

[0055] When calculating impedance using this embodiment, the control circuit 11 can control the charging device 2 to provide an impedance calculation current, obtain a first voltage U1 via the first voltage detection circuit 14, and receive a second voltage U2 transmitted by the host 21. During this process, only the voltage detection circuits need to be provided within the charging device 2 and the vehicle 1, making structural changes to the charging device 2 and the vehicle 1 relatively simple. Furthermore, the voltage detection circuit is a relatively mature technology, thus reducing costs and facilitating the promotion and application of this embodiment. The method of calculating impedance by the control circuit 11 in this embodiment ensures that the impedance is calculated by the control circuit 11 in real time. Furthermore, the voltage values determined by the charging device 2 and the vehicle 1 can be synchronized via the connection B between the two, thereby further increasing the accuracy of the calculated impedance.

[0056] Figure 8 This is a flow chart of another embodiment of the charging current control method provided by the present application, as shown in FIG. Figure 8 The control method shown in Figure 4 Based on the control method shown, it is shown as Figure 4 A specific application of the control method shown.

[0057] In one embodiment, when the charging plug 20 of the charging device 2 is inserted into the charging socket 10 at S10, the connection between the charging plug 20 and the charging socket 10 is established as follows: Figure 4 The connection A and connection B are shown. The host 21 of the charging device 2 can communicate with the control circuit 11 through the connection B. The communication form can be a private protocol handshake communication. When the private protocol handshake recognition is successful, the host 21 and the control circuit 11 complete the pre-charging preparation process according to the process requirements of the private protocol.

[0058] In one embodiment, Figure 8 In S11 shown, the control circuit 11 determines a target control strategy from the first control strategy and the second control strategy according to whether the impedance between the charging plug 10 and the charging socket 20 is greater than a preset impedance value.

[0059] When the impedance between the charging plug 10 and the charging socket 20 is greater than a preset value, the charging current will cause the temperature of the charging plug 10 and the charging socket 20 to be higher and the temperature rise rate to be faster. Therefore, the control circuit 11 can determine Figure 5 The second control strategy shown is a target control strategy, so that when the temperature is low, the current value of the charging current can be reduced in time by using the current limiting coefficient Ik.

[0060] When the impedance between the charging plug 10 and the charging socket 20 is less than or equal to the preset value, the control circuit 11 can determine Figure 3The first control strategy shown is a target control strategy to ensure the charging efficiency of the battery 12. Subsequently, after the control circuit 11 determines the target control strategy in S11 and before S20, the control circuit 11 can send a charging current request message to the host 21, so that the host 21 starts to provide an output current to the power battery 12 through the connection A according to the initial current value in the charging request message, and the current value of the output current at this time is the initial current value.

[0061] In the above embodiment, after the charging plug 20 is inserted into the charging socket 10 and the charging device 2 has not yet output the charging current to the power battery 12, the control circuit 11 first determines the impedance between the two and then determines the target control strategy. Subsequently, when the charging device 2 starts to output the charging current, the control circuit 11 can control the current value of the charging current according to the target control strategy.

[0062] In another embodiment, Figure 8 After S20 shown, the control circuit 11 can still adjust the control strategy when the charging device 2 starts to output the charging current. Figure 8 After S20, the process further includes: S31: adjusting the target control strategy based on the temperature rise rate and / or impedance of the charging socket 10. Returning to S20, the process controls the current value of the charging current output by the charging device 2 to the battery 21 based on the target control strategy adjusted in S31.

[0063] In one embodiment, if Figure 8 The S31 shown specifically includes:

[0064] S301: The control circuit 11 obtains the temperature rise rate of the charging socket 10. The control circuit 11 can store temperature values obtained at different times. After obtaining the current temperature value through the temperature detection circuit 13, the control circuit 11 can calculate the temperature rise rate during a certain period of time based on the temperature values before the current time.

[0065] S302: The control circuit 11 adjusts the target control strategy based on the temperature rise rate calculated in S301. Specifically, the control circuit 11 may compare the temperature rise rate with a preset temperature rise rate and, if the temperature rise rate is greater than the preset temperature rise rate, determine the second control strategy as the target control strategy; if the temperature rise rate is less than or equal to the preset temperature rise rate, determine the first control strategy as the target control strategy.

[0066] In one embodiment, Table 1 is a schematic diagram of preset temperature rise rates at different ambient temperatures. The control circuit 11 can specifically determine the corresponding preset temperature rise rate based on the current ambient temperature. The temperature rise rate calculated in S301 is then compared with the preset temperature rise rate determined in Table 1 to determine the target control strategy.

[0067] Table 1

[0068] Ambient temperature Preset temperature rise rate ～-20℃ <![CDATA[1×10 -4 ×Charging current value 2 ]]> -20～0℃ <![CDATA[2×10 -4 ×Charging current value 2 ]]> 0～20℃ <![CDATA[3×10 -4 ×Charging current value 2 ]]> 20～40℃ <![CDATA[4×10 -4 ×Charging current value 2 ]]> 40℃～ <![CDATA[5×10 -4 ×Charging current value 2 ]]>

[0069] For example, assuming that the current ambient temperature is 10°C, the control circuit 11 determines the preset temperature rise rate as 3×10 -4 ×Charging current value 2 Then, the control circuit 11 compares the calculated temperature rise rate with the preset temperature rise rate, thereby determining the target control strategy.

[0070] Subsequently, after adjusting the target control strategy in S31 , the control circuit 11 controls the current value of the charging current output by the charging device 2 to the battery 12 in S20 .

[0071] In summary, the charging current control method provided in this embodiment is that, during the process of the charging device 2 providing the output charging current, the control circuit 11 can not only adjust the current value of the charging current according to the temperature value and the control strategy, but can also adjust the control strategy in real time according to the temperature rise rate between the charging socket 10 and the charging plug 20, so that the control circuit can control the current value of the charging current output by the charging device 2 more promptly and effectively in different scenarios, even in the charging process, thereby improving the safety performance of the battery 12 during charging, and at the same time further enriching the application scenarios of this embodiment, which is conducive to the application and promotion of the embodiments of this application.

[0072] In another embodiment, Figure 8 S302 shown specifically includes: the control circuit 11 determining a target control strategy from at least two charging current control strategies based on the temperature rise rate and the impedance. Specifically, because this embodiment combines the temperature rise rate and the impedance as two parameters, the control circuit 11 can compare the temperature rise rate with a preset temperature rise rate and the impedance with a preset impedance, and jointly determine the target control strategy.

[0073] Table 2

[0074] V<V1 V1≤V<V2 V2≤V C<C1 First control strategy First control strategy Second control strategy C1≤C<C2 First control strategy Second control strategy Second control strategy C2≤C Second control strategy Second control strategy Second control strategy

[0075] Specifically, Table 2 is a schematic diagram of different temperature rise rates and impedance values. The control circuit 11 can jointly determine the target control strategy based on the temperature rise rate and impedance parameters and the comparison relationship in Table 2. Table 2 sets a first impedance value C1 and a second impedance value C2, and the first impedance value C1 is less than the second impedance value C2. Table 2 also sets a first speed value V1 and a second speed value V2, and the first speed value V1 is less than the second speed value V2.

[0076] When the impedance C is less than the first impedance value C1 and the temperature rise rate V is less than the first speed value V1, the control circuit 11 determines the first control strategy as the target control strategy.

[0077] When the impedance C is less than the first impedance value C1 and the temperature rise rate V is greater than or equal to the first speed value V1 and less than the second speed value V2, the first control strategy is determined to be the target control strategy.

[0078] When the impedance C is less than the first impedance value C1 and the temperature rise rate V is greater than or equal to the second speed value V2, the second control strategy is determined to be the target control strategy.

[0079] When the impedance C is greater than or equal to the first impedance value C1 and less than the second impedance value C2, and the temperature rise rate V is less than the first speed value V1, the control circuit 11 determines the first control strategy as the target control strategy.

[0080] When the impedance C is greater than or equal to the first impedance value C1 and less than the second impedance value C2, and the temperature rise rate V is greater than or equal to the first speed value V1 and less than the second speed value V2, the control circuit 11 determines the second control strategy as the target control strategy.

[0081] When the impedance C is greater than or equal to the first impedance value C1 and less than the second impedance value C2, and the temperature rise rate V is greater than or equal to the second speed value V2, the control circuit 11 determines the second control strategy as the target control strategy.

[0082] When the impedance C is greater than or equal to the second impedance value C2 and the temperature rise rate V is less than the first speed value V1, the control circuit 11 determines the second control strategy as the target control strategy.

[0083] When the impedance C is greater than or equal to the second impedance value C2 and the temperature rise rate V is greater than or equal to the first speed value V1 and less than the second speed value V2, the control circuit 11 determines the second control strategy as the target control strategy.

[0084] When the impedance C is greater than or equal to the second impedance value C2 and V is greater than or equal to the second speed value V2, the control circuit 11 determines the second control strategy as the target control strategy.

[0085] It is understood that if the target control strategy determined in S31 is the same as the target control strategy determined in S11, the control circuit 20 continues to execute S20 according to the same target control strategy. If the target control strategy determined in S31 is different from the target control strategy determined in S11, the control circuit 20 executes S20 according to the adjusted target control strategy.

[0086] In summary, in the charging current control method provided by this embodiment, when the charging device 2 provides the output charging current, the control circuit 11 jointly adjusts the control strategy from two dimensions: the temperature rise rate and the impedance between the charging socket 10 and the charging plug 20. This takes into account the situations that may arise in different application scenarios in a more detailed manner, improves the granularity of adjusting the control strategy, and further improves the safety performance of the battery 12 during charging and the comprehensiveness of the coverage scenarios.

[0087] In the aforementioned embodiments of the present application, the charging current control method provided by the embodiments of the present application is described. In order to implement the various functions of the methods provided by the aforementioned embodiments of the present application, the control circuit 11, as the execution subject, may include a hardware structure and / or a software module, and implement the aforementioned functions in the form of a hardware structure, a software module, or a hardware structure and a software module. Whether a particular one of the aforementioned functions is implemented in the form of a hardware structure, a software module, or a hardware structure and a software module depends on the specific application and design constraints of the technical solution.

[0088] For example, Figure 9 This is a schematic diagram of the structure of a charging current control device provided in this application, such as Figure 9 The device shown can be used to execute the charging current control method provided in any of the above embodiments of the present application. In one embodiment, Figure 9 The charging current control device 1000 shown includes: an acquisition module 1001, a determination module 1002, and a control module 1003. The acquisition module 1001 is used to determine the impedance and / or temperature rise rate between the charging socket (10) and the charging plug (20) of the charging device (2); the determination module 1002 is used to determine a target control strategy based on the impedance and / or temperature rise rate; and the control module 1003 is used to control the charging current output by the charging device (2) based on the target control strategy.

[0089] The specific implementation and principle of the above-mentioned charging current control device refer to the description of the above-mentioned charging current control method, which will not be repeated here.

[0090] It should be noted that it should be understood that the division of the various modules of the above device is merely a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. Moreover, these modules can all be implemented in the form of software called by a processing element; or they can all be implemented in the form of hardware; or some modules can be implemented in the form of software called by a processing element, and some modules can be implemented in the form of hardware. For example, the processing module can be a separately established processing element, or it can be integrated into a chip of the above device. In addition, it can also be stored in the memory of the above device in the form of program code, and called by a processing element of the above device to perform the functions of the above-mentioned module. The implementation of other modules is similar. In addition, these modules can all or partly be integrated together, or they can be implemented independently. The processing element described here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each of the above modules can be completed by an integrated logic circuit of hardware in the processor element or instructions in the form of software.

[0091] For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs). For another example, when a module is implemented by scheduling program code on a processing element, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0092] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)).

[0093] For example, Figure 10 A schematic diagram of the structure of a charging current control device provided in this application, such as Figure 10 The device shown can be used to execute the charging current control method provided in any embodiment of the present application. In one embodiment, Figure 10 The charging current control device 2000 shown includes a processor 2001 and a memory 2002. The memory 2002 is used to store computer-executable instructions, and the processor 2001 can execute the computer-executable instructions stored in the memory 2002. When the computer-executable instructions are executed by the processor 2001, the processor 2001 implements any of the charging current control methods described in the aforementioned embodiments of the present application.

[0094] In one embodiment, if Figure 10 The charging current control device 2000 shown further includes a communication interface 2003 , wherein the processor 2001 can communicate with other devices via the communication interface 2003 , for example, the processor 2001 obtains sufficient voltage or the second voltage via the communication interface 2003 .

[0095] The present application also provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are executed, they can be used to implement any charging current control method in the aforementioned embodiments of the present application.

[0096] An embodiment of the present application further provides a chip for executing instructions, wherein the chip is used to execute any of the charging current control methods described above in the present application.

[0097] An embodiment of the present application further provides a computer program product, including a computer program, which, when executed, implements any of the aforementioned charging current control methods of the present application.

[0098] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A charging current control method, characterized in that: include: determining the impedance and / or temperature rise rate between the charging socket (10) and the charging plug (20) of the charging device (2); determining a target control strategy according to the impedance and / or temperature rise rate; According to the target control strategy, the charging current output by the charging device (2) is controlled.

2. The method according to claim 1, characterized in that The determining of the impedance and / or the temperature rise rate between the charging socket (10) and the charging plug (20) of the charging device (2) comprises: When the charging plug (20) is inserted into the charging socket (10), the impedance between the charging socket (10) and the charging plug (20) is determined.

3. The method according to claim 2, characterized in that The determining of the impedance between the charging socket (10) and the charging plug (20) comprises: controlling the charging device (2) to output a first current; Acquiring a first voltage of the charging socket (10) and a second voltage of the charging plug (20); The impedance is determined according to the first current, the first voltage, and the second voltage.

4. The method according to claim 3, characterized in that The obtaining of the first voltage of the charging socket (10) and the second voltage of the charging plug (20) comprises: obtaining the second voltage determined by a second voltage detection circuit (22) of the charging device (2); The first voltage determined by the first voltage detection circuit (14) is obtained.

5. The method according to any one of claims 1 to 4, characterized in that Determining a target control strategy according to the impedance and / or temperature rise rate includes: When the impedance is greater than a preset impedance value, determining that the target control strategy is a second control strategy; When the impedance is less than or equal to the preset impedance value, the target control strategy is determined to be the first control strategy.

6. The method according to any one of claims 1 to 4, characterized in that Determining a target control strategy according to the impedance and / or temperature rise rate includes: When the temperature rise rate is greater than a preset temperature rise rate value, determining that the target control strategy is the second control strategy; When the temperature rise rate is less than or equal to the preset temperature rise rate value, the target control strategy is determined to be the first control strategy.

7. The method according to any one of claims 1 to 4, characterized in that Determining a target control strategy based on the impedance and / or temperature rise rate includes: When the impedance is greater than or equal to a second impedance value, and the temperature rise rate is less than a first speed value, determining that the target control strategy is a second control strategy; When the impedance is greater than or equal to a second impedance value, and the temperature rise rate is greater than or equal to the first speed value and less than a second speed value, determining that the target control strategy is the second control strategy; When the impedance is greater than or equal to a second impedance value, and the temperature rise rate is greater than or equal to a second speed value, determining that the target control strategy is the second control strategy; When the impedance is greater than or equal to the first impedance value and less than the second impedance value, and the temperature rise rate is less than the first speed value, determining that the target control strategy is the first control strategy; When the impedance is greater than or equal to the first impedance value and less than the second impedance value, and the temperature rise rate is greater than or equal to the first speed value and less than the second speed value, determining that the target control strategy is the second control strategy; When the impedance is greater than or equal to the first impedance value and less than the second impedance value, and the temperature rise rate is greater than the second speed value, determining that the target control strategy is the second control strategy; When the impedance is less than the first impedance value and the temperature rise rate is less than the first speed value, determining that the target control strategy is the first control strategy; When the impedance is less than the first impedance value, and the temperature rise rate is less than the second speed value and greater than or equal to the first speed value, determining that the target control strategy is the first control strategy; When the impedance is less than the first impedance value and the temperature rise rate is greater than or equal to the second speed value, the target control strategy is determined to be the second control strategy.

8. The method according to any one of claims 5 to 7, characterized in that: The controlling of the charging current output by the charging device (2) according to the target control strategy comprises: Determining a mapping relationship corresponding to the target control strategy, the mapping relationship including a corresponding relationship between the temperature value and the current limiting coefficient between the charging socket (10) and the charging plug (20); wherein, in the mapping relationship, the current limiting coefficient corresponding to each temperature value in a continuous first temperature interval is a first value, the current limiting coefficient corresponding to each temperature in a second temperature interval is inversely proportional to the temperature value, and the current limiting coefficient corresponding to each temperature in a third temperature interval is a second value, and the starting temperature value of the second temperature interval of the first control strategy is greater than the starting temperature value of the second temperature interval of the second control strategy; Acquiring a temperature value between the charging socket (10) and the charging plug (20); determining a current limiting coefficient corresponding to the current value according to the temperature value and the mapping relationship; According to the current limiting coefficient, the current value of the charging current output by the charging device (2) is controlled.

9. An electronic device, characterized in that: include: memory and processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the processor performs the method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that Computer-executable instructions are stored, and when the computer-executable instructions are executed, the method according to any one of claims 1 to 8 is implemented.

11. A computer program product, characterized in that The method comprises a computer program, which implements the method according to any one of claims 1 to 8 when the computer program is executed.

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