WO2019062965A1

WO2019062965A1 - Method and apparatus for regulating charging current

Info

Publication number: WO2019062965A1
Application number: PCT/CN2018/108799
Authority: WO
Inventors: 阮斌斌; 黄力坤; 张恒恒; 黄宝仙; 苗苗
Original assignee: 比亚迪股份有限公司
Priority date: 2017-09-30
Filing date: 2018-09-29
Publication date: 2019-04-04
Also published as: TWI678049B; CN109599905A; TW201916532A; CN109599905B

Abstract

Disclosed in the present application are a method and apparatus for regulating a charging current. The method comprises the following steps: detecting a power terminal temperature of a charging interface in each detection period to obtain temperature change condition of the charging interface, and detecting a charging current; and regulating a charging current in a next period according to the temperature change condition of the charging interface in the current detection period and the charging current.

Description

Charging current adjustment method and device

Cross-reference to related applications

The present application is based on a Chinese patent application filed on Sep. 30, 2017, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present application relates to the field of electric vehicle technology, and in particular, to a charging current adjusting method and a charging current adjusting device.

Background technique

At present, energy issues and environmental issues are driving the explosive growth of new energy vehicles, and sales of new energy vehicles are rising. Compared with traditional fuel vehicles, new energy vehicles have great advantages in energy saving and environmental protection. However, the key development targets in new energy vehicles have the drawback of long charging time period. At present, using the increased charging power to shorten the charging time of the electric vehicle is one of the commonly used solutions, but the problem that comes with it is that the charging terminal of the charging interface is severely heated, resulting in burning or charging failure of the terminal, and the whole vehicle cannot be carried out. Normal charging.

Summary of the invention

The present application proposes a charging current adjustment method, which can effectively prevent the charging interface from being over-temperature, can not only effectively protect the charging interface, but also can ensure the normal completion of charging.

The application also proposes a non-transitory computer readable storage medium.

The application also proposes a charging current regulating device.

The first aspect of the present application provides a charging current adjustment method, the method comprising the steps of: detecting a power terminal temperature of a charging interface in each detection period to obtain a temperature change of the charging interface, and detecting a charging current And adjusting the charging current in the next detection period according to the temperature change condition of the charging interface and the charging current in the current detection period.

According to the charging current adjustment method of the embodiment of the present application, the temperature of the charging interface is detected by detecting the temperature of the power terminal of the charging interface in each detection period, and the charging current is detected to detect the temperature of the charging interface according to the current detection period. The change condition and the charging current adjust the charging current in the next detection period, thereby effectively preventing the charging interface from overheating, not only effectively protecting the charging interface, but also ensuring that the charging is completed normally.

The second aspect of the present application provides a non-transitory computer readable storage medium having a computer program stored thereon, which is implemented by the processor to implement the charging current adjustment method proposed by the first aspect of the present application.

According to the non-transitory computer readable storage medium of the embodiment of the present application, by performing the stored computer program, it is possible to effectively prevent the charging interface from being over-temperatureed, not only to effectively protect the charging interface, but also to ensure normal charging completion.

The third embodiment of the present application provides a charging current adjusting device, which includes: a temperature detecting module, configured to detect a power terminal temperature of a charging interface in each detecting period to obtain a temperature change of the charging interface; The current detecting module is configured to detect the charging current in each detecting period; and the control module is configured to adjust the charging current in the next detecting period according to the temperature change condition of the charging interface and the charging current in the current detecting period.

According to the charging current adjusting device of the embodiment of the present application, the temperature detecting module detects the temperature of the power terminal of the charging interface in each detecting period to obtain the temperature change of the charging interface, and detects the charging in each detecting period by the current detecting module. The current is controlled so that the control module adjusts the charging current in the next detection period according to the temperature change of the charging interface and the charging current in the current detection period, thereby effectively preventing the charging interface from being over-temperature, and not only effectively protecting the charging interface, It also ensures that the charging is completed normally.

DRAWINGS

1 is a flow chart of a charging current adjustment method according to an embodiment of the present application;

2 is a schematic structural diagram of a power terminal of a charging interface according to an embodiment of the present application;

3 is a graph showing relationship between heat dissipation power and power terminal temperature according to an embodiment of the present application;

4 is a graph showing a relationship between temperature rise and power terminal temperature according to an embodiment of the present application;

FIG. 5 is a block schematic diagram of a charging current adjusting device according to an embodiment of the present application.

Detailed ways

The embodiments of the present application are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to be illustrative, and are not to be construed as limiting.

In the related art, the charging interface is provided with temperature monitoring and over-temperature protection functions, but the implementation of the function is basically to set a temperature upper limit value, and when the charging interface temperature reaches the temperature upper limit value, directly by the electric vehicle The charger or associated control unit controls the charging to stop. For this implementation, if the temperature upper limit is set to be large, the material of the charging interface is prone to aging when the charging interface reaches or approaches the upper temperature limit for a long time, and the high temperature aging is unrecoverable; If the upper limit of the temperature is set small, the upper limit of the temperature will be reached in a short time during charging, which will stop charging frequently, which makes the charging difficult to complete normally and affects the user's use of the electric vehicle.

A charging current adjustment method and apparatus according to an embodiment of the present application will be described below with reference to the accompanying drawings.

FIG. 1 is a flow chart of a charging current adjustment method according to an embodiment of the present application. As shown in FIG. 1 , the charging current adjustment method of the embodiment of the present application includes the following steps:

S1. Detect the power terminal temperature of the charging interface in each detection cycle to obtain a temperature change of the charging interface, and detect the charging current.

The charging interface of the embodiment of the present application may include a charging plug and a charging socket. When the charging plug and the charging socket are connected, the charging device (such as a charging post) can charge the device to be charged (such as an electric car).

The power terminal of the charging interface in this embodiment is a terminal that transmits a charging current, which can generate heat during charging. The charging interface may further include a signal terminal for transmitting signals between the charging device (such as a charging post) and the device to be charged (such as an electric car), and the signal terminal generally does not generate heat during charging due to the transmission of a small signal.

As shown in FIG. 2, when the charging plug and the charging socket are connected, the power terminals of the two, that is, the charging plug terminals, can be connected to the charging socket terminals, and the charging plug terminals and the charging socket terminals can be crimped to the corresponding wires. In one embodiment of the present application, the charging plug terminal, the charging receptacle terminal, the terminal crimping point, and a portion of the wires may be located inside the charging interface for design and process requirements. During the charging process, the conductors such as the charging plug terminal, the charging socket terminal, the terminal crimping point and the metal portion of the partial wire in the charging interface generate heat and absorb heat, and the insulating layer of some of the wires in the charging interface radiates heat outward.

According to the relationship between heat generation, heat absorption and heat dissipation, the relationship between the heating power P ₀ , the heat absorption power P ₁ and the heat dissipation power P ₂ can be obtained, as shown in the following formula (1):

P ₀ =P ₁ +P ₂ (1)

The heat absorption power P ₁ determines the heating condition of the power terminal of the charging interface, that is, the temperature change of the charging interface.

In one embodiment of the present application, as shown in FIG. 2, a temperature sensor may be provided at the terminal crimping point of the charging receptacle terminal to detect the power terminal temperature of the charging interface.

Specifically, the whole process of detecting the power terminal temperature of the charging interface may be divided into multiple detection periods, and the start power terminal temperature T _{start of} the detection cycle start time point and the detection cycle deadline time are detected in each detection cycle. The cut-off power terminal temperature T of the point is turned _off , and the temperature rise in the detection period is obtained according to the difference between the cutoff power terminal temperature T _cutoff and the start power terminal temperature T _start . The starting power terminal temperature T _starts from the temperature of the power terminal at the starting time point, and the cut-off power terminal temperature T is _{cut off} to the temperature of the power terminal at the cut-off time point.

Generally, in the charging current adjustment method of the embodiment of the present application, the current in one detection period does not change, and therefore, the charging current can be the charging current detected at any time point in one detection period. In one embodiment of the present application, the charging current can also be the average charging current for one detection period.

S2, adjusting the charging current in the next detection period according to the temperature change of the charging interface and the charging current in the current detection period.

In an embodiment of the present application, the proportional coefficient may be calculated according to the temperature change of the charging interface in the current detection period, and then the charging current in the next detection period is calculated according to the proportional coefficient and the charging current in the current detection period. . In the next detection period, the control charging current is the calculated charging current in the next detection period, which can effectively prevent the charging current from being too high in the next detection period.

It should be understood that since the charging current in the next detection period is adjusted according to the temperature change of the charging interface and the charging current in the current detection period, the charging current adjustment can be controlled by setting the duration of each detection period. Precision. Correspondingly, the shorter each detection period, the higher the accuracy of the charging current adjustment.

Specifically, the relationship between the heat dissipation power of the charging interface and the power terminal temperature of the charging interface under the test condition is obtained as a preset first relationship, and the power terminal temperature of the charging interface under the test condition is obtained and the temperature of the power terminal is The relationship between the temperature rise of the initial temperature in one detection period serves as a preset second relationship. The preset first relationship may be obtained according to parameters such as a power terminal temperature of the charging interface and a power terminal resistance value of the charging interface under test conditions. The test conditions include selecting a plurality of sample charging interfaces, and switching the rated current to the plurality of sample charging interfaces at different initial temperatures.

Specifically, a plurality of (for example, three) sample charging interfaces may be selected according to requirements, wherein the specifications of each sample charging interface are the same as those of the charging interface to which the charging current is to be adjusted in the embodiment of the present application. Under the test conditions, a temperature sensor can also be set at the terminal crimping point of the charging socket terminal of the sample charging interface, and the power terminal temperature of the sample charging interface is detected in each detection cycle.

First, the power terminal temperature of a sample charging interface is brought to an initial temperature T ₀ , for example, the test can be performed under the condition that the ambient temperature is T ₀ . Then charging power measurement sample interface terminal resistance value R _0, and then the charging port is turned sample rated current I _0, the temperature sensor until the temperature reaches a temperature T _balance equilibrium, or up to the maximum heat-resistant temperature T _stop charging interface, wherein, the charging interface may be heat-resistant upper limit temperature T _stop charging the lowest temperatures of the heat-resistant material within the interface.

During the process of turning on the rated current I ₀ for the sample charging interface, the temperature value T of the temperature sensor and the power terminal resistance R of the sample charging interface are acquired in real time.

At the same time, the mass m _{1 of the} inner conductor of the sample charging interface can be measured, and according to the above formula (1), the following formula (2) can be obtained:

n*I ₀ ² *R=C ₁ m ₁ ΔT/t+P ₂ (2)

Where n is the number of power terminals of the sample charging interface, C ₁ is the specific heat capacity of the inner conductor of the sample charging interface, t is the time of one detection cycle, and ΔT is the temperature rise of one detection cycle.

According to the above test method, multiple test results can be obtained by testing the plurality of sample charging interfaces at different initial temperatures, and a plurality of test results can be obtained, and the heat dissipation power of the charging interface and the power terminal of the charging interface can be obtained under the test conditions. The relationship between the temperatures is the preset first relationship. The relationship between the power terminal temperature of the charging interface under the test condition and the temperature rise of the power terminal temperature in a detection period is the preset second relationship. . The preset first relationship may be as shown in FIG. 3, and the heat dissipation power P ₂ of the charging interface increases as the power terminal temperature T of the charging interface increases, until the power terminal temperature T reaches T _balance or T _stops . The rate of change of the heat dissipation power P ₂ of the charging interface is gradually decreased; the preset second relationship can be as shown in FIG. 4, and the temperature rise ΔT of the power terminal is the starting temperature in one detection period along with the power The terminal temperature T increases and increases until the power terminal temperature reaches T _balance or T _stop , and the rate of change of the temperature rise ΔT gradually decreases.

In an embodiment of the present application, after obtaining the preset first relationship and the preset second relationship, the current detection period may be obtained according to the initial power terminal temperature and the cutoff power terminal temperature in the current detection period. Temperature rise, and obtaining the heat dissipation power of the charging interface in the current detection period according to the cutoff power terminal temperature in the current detection period and the preset first relationship, and according to the starting power terminal temperature and the preset second in the current detection period The relationship between the starting power terminal temperature and the temperature rise in a detection period under the condition of the test, and according to the temperature rise in the current detection period, the starting power terminal temperature is the starting temperature under the test condition. The temperature rise in one detection period and the heat dissipation power of the charging interface in the current detection period are calculated as a proportional coefficient K ₁ .

Specifically, the scaling factor K ₁ can be calculated according to the following formula (3):

Wherein C ₁ is the specific heat capacity of the inner conductor of the charging interface, m ₁ is the mass of the inner conductor of the charging interface, ΔT _tN is the temperature rise in the current detection period, and ΔT is the starting temperature at the starting power terminal temperature under the test condition. The temperature rise during one detection period, and P ₂ is the heat dissipation power of the charging interface during the current detection period.

Further, according to the relationship shown by the above formula (2), and in combination with the above formula (3), the following formula (4) can be obtained:

Where, I _tN is the charging current in the current detection period, R _tN is the power terminal resistance value of the charging interface under the cut-off power terminal temperature in the current detection period, and R is the power terminal of the charging interface under the temperature of the cut-off power terminal under the test condition Resistance value.

It should be understood that if at different initial temperatures, regardless of the matching performance of the charging interface and the degree of wear and aging of the charging interface, the heating capacity of the charging interface is ensured to be equal to the heat generated under the above test conditions, and the temperature rise rate of the charging interface can be ensured. Not more than the rate of temperature rise under the above test conditions. Therefore, in the embodiment of the present application, the heating power P _{0 of the} next detection period t(N+1) can be made the same as the test time, so that the heating power of the charging interface can be guaranteed to be at a lower level. Let the heating power P _{0 of the} next detection period t(N+1) be the same as the test time, as shown in the following formula (5):

Where I _t(N+1) is the charging current in the next detection period, and R _t(N+1) is the power terminal resistance value of the charging interface at the off power terminal temperature in the next detection period.

Substituting the above formula (5) into the above formula (4), the following formula (6) can be obtained:

Generally, the detection period is short, so the temperature rise in the adjacent detection period is small, and the change in the resistance value of the power terminal is also small.

Therefore, the following formula (7) can be obtained:

Accordingly, the calculated K ₁ after the scale factor, the charging current may be calculated charging current in the next detection cycle in accordance with the scaling factor K ₁ and the current detection period, i.e., (7) within the next detection period calculated based on the formula The charging current.

In addition, in an embodiment of the present application, the charging current lower limit value may be set according to user requirements, etc., if the calculated charging current in the next detection period is less than the charging current lower limit value, the charging current lower limit is set. The value is used as the charging current in the next detection period, thereby preventing the charging rate from being affected by the charging current being too low.

And stop charging, the current actual charging process, the heat can reach the upper limit temperature T _stop charging interface of the interface in the charging power terminal temperature, a temperature may be at a charging power terminal interface temperature exceeds the equilibrium conditions of the test T _balance and smaller than the upper limit temperature T of the heat _stops, the charging current is reduced to the lower limit value of the charging current.

In summary, according to the charging current adjustment method of the embodiment of the present application, the temperature of the charging interface is detected by detecting the temperature of the power terminal of the charging interface in each detection period, and the charging current is detected to be detected according to the current detection period. The temperature change of the charging interface and the charging current adjust the charging current in the next detection period, thereby effectively preventing the charging interface from overheating, not only effectively protecting the charging interface, but also ensuring that the charging is completed normally.

Corresponding to the above embodiments, the present application also proposes a non-transitory computer readable storage medium.

The non-transitory computer readable storage medium of the embodiment of the present application has a computer program stored thereon, and when the program is executed by the processor, the charging current adjustment method proposed in the above embodiment of the present application can be implemented.

In order to implement the charging current adjustment method of the above embodiment, the present application also proposes a charging current adjusting device.

As shown in FIG. 5, the charging current adjusting device of the embodiment of the present application includes: a temperature detecting module 10, a current detecting module 20, and a control module 30.

The temperature detecting module 10 is configured to detect the temperature of the power terminal of the charging interface to obtain the temperature change of the charging interface in each detecting period, and the current detecting module 20 is configured to detect the charging current in each detecting period, and the control module 30 uses The charging current in the next detection period is adjusted according to the temperature variation of the charging interface and the charging current in the current detection period.

The power terminal is a terminal that transmits a charging current, which can generate heat during charging. The charging interface may further include a signal terminal for transmitting signals between the charging device (such as a charging post) and the device to be charged (such as an electric car), and the signal terminal generally does not generate heat during charging due to the transmission of a small signal.

P ₀ =P ₁ +P ₂ (1)

In an embodiment of the present application, as shown in FIG. 2, a temperature sensor may be disposed at a terminal crimping point of the charging socket terminal, and the temperature detecting module 10 may detect the power terminal temperature of the charging interface through the temperature sensor.

Further, the process may detect the temperature of the power terminals of the charging interface is divided into a plurality of detection period, the detection module 10 detects the temperature in each detection cycle start temperature of the power terminal point of the detection period and the start time T _start The cut-off power terminal temperature T of the detection cycle cut-off time point is turned _off , and the temperature rise in the detection period is obtained according to the difference between the cutoff power terminal temperature T _cutoff and the start power terminal temperature T _start .

Generally, under the control of the charging current adjustment device of the embodiment of the present application, the current in one detection period does not change. Therefore, the charging current may be the charging current detected by the current detecting module 20 at any time point within one detection period. . In one embodiment of the present application, the charging current may also be an average charging current for one detection period.

In an embodiment of the present application, the control module 30 may calculate a proportional coefficient according to a temperature change condition of the charging interface in the current detection period, and then calculate the next detection period according to the proportional coefficient and the charging current in the current detection period. The charging current. During the next detection period, the control module 30 controls the charging current to be the calculated charging current in the next detection period, thereby effectively preventing the charging current from being too high in the next detection period.

Further, the relationship between the heat dissipation power of the charging interface and the power terminal temperature of the charging interface under the test condition may be obtained as a preset first relationship, and the power terminal temperature of the charging interface under the test condition is obtained and the temperature of the power terminal is The relationship between the temperature rise of the initial temperature in one detection period serves as a preset second relationship. The preset first relationship may be obtained according to parameters such as a power terminal temperature of the charging interface and a power terminal resistance value of the charging interface under test conditions. The test conditions include selecting a plurality of sample charging interfaces, and switching the rated current to the plurality of sample charging interfaces at different initial temperatures.

Specifically, a plurality of (for example, three) sample charging interfaces may be selected according to requirements, wherein the specifications of each sample charging interface are the same as those of the charging interface to which the charging current is to be adjusted in the embodiment of the present application. Under the test conditions, a temperature sensor can also be set at the terminal crimping point of the charging socket terminal of the sample charging interface, and the power terminal temperature of the sample charging interface is detected at each detection cycle.

n*I ₀ ² *R=C ₁ m ₁ ΔT/t+P ₂ (2)

According to the above test method, multiple test results can be obtained by testing the plurality of sample charging interfaces at different initial temperatures, and a plurality of test results can be obtained, and the heat dissipation power of the charging interface and the power terminal of the charging interface can be obtained under the test conditions. The relationship between the temperatures, that is, the preset first relationship, the power terminal temperature of the charging interface under the test condition, and the relationship between the temperature rise of the power terminal temperature and the temperature rise in one detection period, that is, the preset The second relationship. The preset first relationship may be as shown in FIG. 3, and the heat dissipation power P ₂ of the charging interface increases as the power terminal temperature T of the charging interface increases, until the power terminal temperature T reaches T _balance or T _stops . The rate of change of the heat dissipation power P ₂ of the charging interface is gradually decreased; the preset second relationship can be as shown in FIG. 4, and the temperature rise ΔT of the power terminal is the starting temperature in one detection period along with the power The terminal temperature T increases and increases until the power terminal temperature reaches T _balance or T _stop , and the rate of change of the temperature rise ΔT gradually decreases.

The preset first relationship and the preset second relationship may be stored and retrieved by the control module 30 during charging current adjustment.

In an embodiment of the present application, the control module 30 may obtain the temperature rise in the current detection period according to the initial power terminal temperature and the cutoff power terminal temperature in the current detection period, and according to the cutoff power terminal temperature and the current detection period. The preset first relationship acquires the heat dissipation power of the charging interface in the current detection period, and starts from the starting power terminal temperature according to the initial power terminal temperature and the preset second relationship in the current detection period. The temperature rise of the temperature during a detection period, and according to the temperature rise in the current detection period, the temperature rise of the starting power terminal temperature under the test condition in a detection period and the charging interface of the current detection period The heat dissipation power calculates the proportionality factor K ₁ .

Further, the control module 30 may calculate the scaling factor K ₁ according to the following formula (3):

Therefore, the following formula (7) can be obtained:

Therefore, after calculating the proportional coefficient K ₁ , the control module 30 can calculate the charging current in the next detection period according to the proportional coefficient K ₁ and the charging current in the current detection period, that is, the control module 30 can calculate according to the above formula (7). The charging current in the next detection cycle.

In addition, in an embodiment of the present application, the charging current lower limit value may be set in the control module 30 according to user requirements or the like, and the charging current lower limit value may be set, and the control module 30 may calculate the obtained next detection period. When the internal charging current is less than the lower limit of the charging current, the lower limit of the charging current is used as the charging current in the next detection period, thereby preventing the charging rate from being affected by the charging current being too low.

And stop charging, the current actual charging process, the control module 30 may also provide heat _{to stop} charging upper limit temperature T at the interface of the charging power terminal interface temperature, also at a power terminal charging interface temperature exceeds the temperature of the test conditions The balance T _balance and less than the heat-resistant upper limit temperature T _stop the charging current to the lower limit of the charging current.

In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "previous", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Out, Clockwise, Counterclockwise, Axial The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present application and the simplified description, and does not indicate or imply the indicated device or The elements must have a particular orientation, are constructed and operated in a particular orientation, and are therefore not to be construed as limiting.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.

In the present application, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless otherwise explicitly stated and defined. , or integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood on a case-by-case basis.

In the present application, the first feature "on" or "below" the second feature may be the direct contact of the first and second features, or the first and second features are indirectly through the intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the application. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification and features of various embodiments or examples may be combined and combined without departing from the scope of the invention.

While the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the present application. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A charging current adjustment method, comprising the steps of:

Detecting a power terminal temperature of the charging interface during each detection period to obtain a temperature change of the charging interface, and detecting a charging current;

The charging current in the next detection period is adjusted according to the temperature change of the charging interface and the charging current in the current detection period.
The charging current adjustment method according to claim 1, wherein the adjusting the charging current in the next detection period according to the temperature change of the charging interface and the charging current in the current detection period comprises:

Obtaining a temperature rise in the current detection period according to a starting power terminal temperature and a cutoff power terminal temperature in the current detection period;

Acquiring the heat dissipation power of the charging interface in the current detection period according to the cutoff power terminal temperature in the current detection period and the preset first relationship, where the preset first relationship is the charging interface under the test condition The relationship between the heat dissipation power and the power terminal temperature of the charging interface;

And obtaining, according to the initial power terminal temperature in the current detection period and a preset second relationship, a temperature rise in the detection condition that the starting power terminal temperature is a starting temperature in one of the detection periods, wherein The second relationship is set between a power terminal temperature of the charging interface under test conditions and a temperature rise of the power terminal temperature as a starting temperature in one of the detection periods;

And according to the temperature rise in the current detection period, the temperature rise in the detection period with the starting power terminal temperature as the starting temperature, and the heat dissipation of the charging interface in the current detection period. Power calculation scale factor;

Calculating a charging current in the next detection period according to the scaling factor and a charging current in the current detection period.
The charging current adjusting method according to claim 2, wherein the test condition comprises selecting a plurality of sample charging interfaces, and switching the rated current to the plurality of sample charging interfaces at different initial temperatures.
The charging current adjustment method according to claim 3, wherein the proportional coefficient is calculated according to the following formula:

Wherein K 1 is the proportional coefficient, C 1 is the specific heat capacity of the inner conductor of the charging interface, m 1 is the mass of the inner conductor of the charging interface, ΔT tN is the temperature rise in the current detection period, and ΔT is Under the test condition, the temperature rise of the initial power terminal temperature as a starting temperature in one of the detection periods, and P 2 is the heat dissipation power of the charging interface in the current detection period.
The charging current adjustment method according to claim 4, wherein the charging current in the next detection period is calculated according to the following formula:

Where I t(N+1) is the charging current in the next detection period, and I tN is the charging current in the current detection period.
The charging current adjustment method according to claim 5, further comprising:

Set the lower limit of the charging current;

If the calculated charging current in the next detection period is less than the charging current lower limit value, the charging current lower limit value is used as the charging current in the next detection period.
The charging current adjustment method according to claim 6, further comprising:

Stop charging when the power terminal temperature of the charging interface reaches the heat-resistant upper limit temperature of the charging interface;

Alternatively, when the power terminal temperature of the charging interface exceeds the temperature balance under the test condition and is less than the heat-resistant upper limit temperature of the charging interface, the charging current is reduced to the charging current lower limit value.
The charging current adjusting method according to any one of claims 1 to 7, wherein the power terminal temperature of the charging interface is detected by a temperature sensor provided at a terminal crimping point of the charging socket terminal.
The charging current adjusting method according to any one of claims 1 to 8, wherein the charging current is a charging current detected at any time point in one detection period, or the charging current is the one detecting. The average charging current during the period.
A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the program is executed by a processor to implement the charging current adjustment method according to any one of claims 1-9.
A charging current regulating device, comprising:

a temperature detecting module, configured to detect a power terminal temperature of the charging interface in each detection period to obtain a temperature change of the charging interface;

a current detecting module for detecting a charging current in each detection period;

And a control module, configured to adjust a charging current in a next detection period according to a temperature change condition of the charging interface and a charging current in a current detection period.
The charging current regulating device according to claim 11, wherein the control module is configured to:

Obtaining a temperature rise in the current detection period according to a starting power terminal temperature and a cutoff power terminal temperature in the current detection period;

Acquiring the heat dissipation power of the charging interface in the current detection period according to the cutoff power terminal temperature in the current detection period and the preset first relationship, where the preset first relationship is the charging interface under the test condition The relationship between the heat dissipation power and the power terminal temperature of the charging interface;

And obtaining, according to the initial power terminal temperature in the current detection period and a preset second relationship, a temperature rise in the detection condition that the starting power terminal temperature is a starting temperature in one of the detection periods, wherein The second relationship is set between a power terminal temperature of the charging interface under test conditions and a temperature rise of the power terminal temperature as a starting temperature in one of the detection periods;

And according to the temperature rise in the current detection period, the temperature rise in the detection period with the starting power terminal temperature as the starting temperature, and the heat dissipation of the charging interface in the current detection period. Power calculation scale factor;

Calculating a charging current in the next detection period according to the scaling factor and a charging current in the current detection period.
The charging current regulating device according to claim 12, wherein the test condition comprises selecting a plurality of sample charging interfaces, and switching the rated current to the plurality of sample charging interfaces at different initial temperatures.
The charging current regulating device according to claim 13, wherein said control module calculates said scaling factor according to the following formula:

Wherein K 1 is the proportional coefficient, C 1 is the specific heat capacity of the inner conductor of the charging interface, m 1 is the mass of the inner conductor of the charging interface, ΔT tN is the temperature rise in the current detection period, and ΔT is Under the test condition, the temperature rise of the initial power terminal temperature as a starting temperature in one of the detection periods, and P 2 is the heat dissipation power of the charging interface in the current detection period.
The charging current regulating device according to claim 14, wherein said control module calculates a charging current in said next detection period according to the following formula:

Where I t(N+1) is the charging current in the next detection period, and I tN is the charging current in the current detection period.
The charging current regulating device according to claim 15, wherein the control module is further configured to set a charging current lower limit value, wherein the control module charges the calculated current detection period When the current is less than the lower limit of the charging current, the lower limit of the charging current is used as the charging current in the next detection period.
The charging current regulating device according to claim 16, wherein the control module is further configured to stop charging when a power terminal temperature of the charging interface reaches a heat-resistant upper limit temperature of the charging interface; or

When the power terminal temperature of the charging interface exceeds the temperature balance under the test condition and is less than the heat-resistant upper limit temperature of the charging interface, the charging current is reduced to the charging current lower limit value.
The charging current adjusting device according to any one of claims 11-17, wherein the power terminal temperature of the charging interface is detected by a temperature sensor provided at a terminal crimping point of the charging socket terminal.
The charging current adjusting device according to any one of claims 11 to 18, wherein the charging current is a charging current detected at any time point within one detection period, or the charging current is the one detecting. The average charging current during the period.