CN115635876A - Low-voltage battery charging control system and method - Google Patents
Low-voltage battery charging control system and method Download PDFInfo
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- CN115635876A CN115635876A CN202211366244.2A CN202211366244A CN115635876A CN 115635876 A CN115635876 A CN 115635876A CN 202211366244 A CN202211366244 A CN 202211366244A CN 115635876 A CN115635876 A CN 115635876A
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Abstract
The invention belongs to the technical field of electric automobiles, and discloses a low-voltage battery charging control system and method. The method specifically comprises the following steps: the vehicle control system comprises a high-voltage power supply device, a high-voltage conversion device, a low-voltage battery, and a vehicle control unit, wherein the high-voltage power supply device, the high-voltage conversion device and the low-voltage battery are sequentially connected; the method comprises the steps that a low-voltage battery detects the current battery state when the whole vehicle is in a high-voltage state, a charging mode is started when the current electric quantity is lower than a preset threshold value, and a charging request is sent according to the current battery state; the vehicle control unit responds to the charging request and sends a voltage control instruction to the high-voltage conversion device; the high-voltage conversion device responds to the voltage control instruction to convert the high-voltage power distribution output by the high-voltage power supply device, and outputs the converted low-voltage power distribution to the low-voltage battery for charging. The charging request voltage is accurately estimated according to the current battery state, so that the low-voltage battery is always in the optimal charging state, the charging efficiency of the battery is improved, and the influence of the load fluctuation of the whole vehicle on the service life of the battery is effectively avoided.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a low-voltage battery charging control system and method.
Background
The existing low-voltage battery charging basically adopts fixed voltage for charging, the influence of the battery state and load fluctuation on the charging current of the battery is not considered, the charging efficiency of the low-voltage battery is low, and the service life of the battery is also influenced.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a low-voltage battery charging control system and a low-voltage battery charging control method, and aims to solve the technical problems that the charging efficiency of a low-voltage battery is low and the service life of the battery is influenced because the existing low-voltage battery is charged by adopting fixed voltage.
In order to achieve the above object, the present invention provides a low-voltage battery charge control system, including: the system comprises a high-voltage power supply device, a high-voltage conversion device, a low-voltage battery, and a vehicle control unit, wherein the high-voltage power supply device, the high-voltage conversion device and the low-voltage battery are sequentially connected;
the low-voltage battery is used for detecting the current battery state when the whole vehicle is in a high-voltage state, starting a charging mode when the current electric quantity is lower than a preset threshold value, and sending a charging request according to the current battery state;
the vehicle control unit is used for responding to the charging request and sending a voltage control command to the high-voltage conversion device;
and the high-voltage conversion device is used for responding to the voltage control instruction to convert the high-voltage power distribution output by the high-voltage power supply device and outputting the converted low-voltage power distribution to the low-voltage battery for charging.
Optionally, the low-voltage battery is further configured to query a corresponding optimal charging current and an optimal voltage according to the current battery state, calculate an output voltage according to the optimal charging current and the optimal voltage, and send a charging request according to the output voltage.
Optionally, the low-voltage battery charging control system further includes a low-voltage load, a target connection point is arranged on a connection line between the high-voltage conversion device and the low-voltage battery, and the low-voltage load is connected to the target connection point;
the high-voltage conversion device is also used for supplying power to the low-voltage load;
the low-voltage battery is further configured to determine a load current corresponding to the low-voltage load, a first wire harness resistance between the high-voltage conversion device and the target connection point, and a second wire harness resistance between the target connection point and the low-voltage battery, calculate a first voltage according to the load current, the optimal charging current, and the first wire harness resistance, calculate a second voltage according to the optimal charging current and the second wire harness resistance, and calculate an output voltage according to the first voltage, the second voltage, and the optimal voltage.
Optionally, the current battery state includes a current temperature and a current electric quantity, and different temperatures, different electric quantities, and corresponding optimal charging currents and optimal voltages are stored in the low-voltage battery.
Optionally, the high voltage conversion device is in communication connection with the low voltage battery;
the high-voltage conversion device is also used for detecting the actual output current and the actual output voltage of the high-voltage conversion device when the low-voltage battery is in a charging state, and sending the actual output current and the actual output voltage of the high-voltage conversion device to the low-voltage battery;
the low-voltage battery is further configured to detect an actual charging current and an actual input voltage of the low-voltage battery when the low-voltage battery is in a charging state, calculate a first harness resistivity and a second harness resistivity in a current state according to an actual output voltage of the high-voltage conversion device and an actual input voltage of the low-voltage battery when the actual charging current of the low-voltage battery is smaller than the optimal charging current, an actual output current of the high-voltage conversion device is smaller than a target output current, and a first current difference is equal to a second current difference, recalculate a corrected output voltage according to the current state based on the first harness resistivity and the second harness resistivity, and send a charging request according to the corrected output voltage, wherein the first current difference is a current difference between the target output current and the actual output current of the high-voltage conversion device, and the second current difference is a current difference between the optimal charging current and the actual charging current of the low-voltage battery.
Optionally, the low-voltage battery is further configured to, when an actual charging current of the low-voltage battery is greater than the optimal charging current, an actual output current of the high-voltage conversion device is greater than a target output current, and a third current difference is equal to a fourth current difference, calculate a first harness resistivity and a second harness resistivity in a current state according to an actual output voltage of the high-voltage conversion device and an actual input voltage of the low-voltage battery, recalculate a corrected output voltage according to the current state based on the first harness resistivity and the second harness resistivity, and issue a charging request according to the corrected output voltage, where the third current difference is a current difference between the actual output current of the high-voltage conversion device and the target output current, and the fourth current difference is a current difference between the actual charging current of the low-voltage battery and the optimal charging current.
Optionally, the low-voltage battery is further configured to, when the actual charging current of the low-voltage battery is smaller than the optimal charging current and the actual output current of the high-voltage conversion device is equal to the target output current, calculate a target load current in a current state according to the actual output voltage of the high-voltage conversion device and the actual input voltage of the low-voltage battery, recalculate the corrected output voltage according to the current state based on the target load current, and send a charging request according to the corrected output voltage.
Optionally, the low-voltage battery is further configured to, when the actual charging current of the low-voltage battery is greater than the optimal charging current and the actual output current of the high-voltage conversion device is equal to the target output current, calculate a target load current in a current state according to the actual output voltage of the high-voltage conversion device and the actual input voltage of the low-voltage battery, recalculate the corrected output voltage according to the current state based on the target load current, and send a charging request according to the corrected output voltage.
Optionally, the low-voltage battery is further configured to send a charging stop request to the vehicle control unit when it is detected that the current electric quantity reaches the preset threshold;
and the vehicle control unit is also used for responding to the charging stop request and sending a charging stop instruction to the high-voltage conversion device.
In addition, in order to achieve the above object, the present invention also provides a low-voltage battery charging control method applied to the low-voltage battery charging control system as described above, including: the system comprises a high-voltage power supply device, a high-voltage conversion device, a low-voltage battery, and a vehicle control unit, wherein the high-voltage power supply device, the high-voltage conversion device and the low-voltage battery are sequentially connected;
the low-voltage battery charging control method comprises the following steps:
when the whole vehicle is in a high-voltage state, the low-voltage battery detects the current battery state, and when the current electric quantity is lower than a preset threshold, a charging mode is started, and a charging request is sent according to the current battery state;
the vehicle control unit responds to the charging request and sends a voltage control instruction to the high-voltage conversion device;
and the high-voltage conversion device responds to the voltage control instruction to convert the high-voltage power distribution output by the high-voltage power supply device and outputs the converted low-voltage power distribution to the low-voltage battery for charging.
The invention provides a low-voltage battery charging control system, which comprises: the vehicle control system comprises a high-voltage power supply device, a high-voltage conversion device, a low-voltage battery, and a vehicle control unit, wherein the high-voltage power supply device, the high-voltage conversion device and the low-voltage battery are sequentially connected; when the whole vehicle is in a high-voltage state, the low-voltage battery detects the current battery state, and when the current electric quantity is lower than a preset threshold, a charging mode is started, and a charging request is sent according to the current battery state; the vehicle control unit responds to the charging request and sends a voltage control instruction to the high-voltage conversion device; the high-voltage conversion device responds to the voltage control instruction to convert the high-voltage power distribution output by the high-voltage power supply device, and outputs the converted low-voltage power distribution to the low-voltage battery for charging. Through the mode, the charging request voltage is accurately estimated according to the current battery state, the output voltage of the high-voltage conversion device is dynamically adjusted, so that the low-voltage battery is always in the optimal charging state, the battery charging efficiency is improved, and the influence of the load fluctuation of the whole vehicle on the service life of the battery is effectively avoided.
Drawings
Fig. 1 is a block diagram showing a first embodiment of a low-voltage battery charge control system according to the present invention;
FIG. 2 is a diagram illustrating a relationship curve between a request voltage, a charging current and an amount of electricity of the low-voltage battery charging control system according to the present invention;
FIG. 3 is a schematic block diagram of a low-voltage battery of the low-voltage battery charging control system of the present invention;
fig. 4 is a block diagram illustrating a second embodiment of a low-voltage battery charging control system according to the present invention;
FIG. 5 is a schematic diagram of the high voltage switching device, load and low voltage battery arrangement of the low voltage battery charge control system of the present invention;
fig. 6 is a block diagram showing the structure of a third embodiment of the low-voltage battery charging control system according to the present invention;
FIG. 7 is a graph showing the variation of current during the charging process of the low-voltage battery charging control system according to the present invention;
FIG. 8 is a schematic diagram of a specific operation flow of the low-voltage battery charging control system according to the present invention;
fig. 9 is a flowchart illustrating a first embodiment of a method for controlling charging of a low-voltage battery according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An embodiment of the present invention provides a method for controlling charging of a low-voltage battery, and referring to fig. 1, fig. 1 is a block diagram of a first embodiment of a charging control system for a low-voltage battery according to the present invention.
In this embodiment, the charging control system for the low-voltage battery 30 includes: the vehicle control system comprises a high-voltage power supply device 10, a high-voltage conversion device 20 and a low-voltage battery 30 which are connected in sequence, and a vehicle control unit 40 which is respectively connected with the low-voltage battery 30 and the high-voltage conversion device 20 in a communication mode.
The low-voltage battery 30 is configured to detect a current battery state when the entire vehicle is in the high-voltage state, start a charging mode when the current electric quantity is lower than a preset threshold, and send a charging request according to the current battery state.
It should be understood that the low-voltage battery 30 includes a power supply module, a detection module, an acquisition module, a communication module, a control module, and the like, wherein the power supply module of the low-voltage battery 30 is mainly used for supplying power to a load of the entire vehicle; the low-voltage battery 30 detection module is mainly used for detecting the state of the low-voltage battery 30 in real time, and specifically, mainly used for detecting the temperature, voltage, current and the like of the battery; the low-voltage battery 30 communication module is mainly used for realizing information interaction with the vehicle control unit 40; the control module of the low-voltage battery 30 is mainly used for controlling the normal on-off of a relay inside the low-voltage battery 30 to realize normal charging and discharging.
It should be noted that the low-voltage battery 30 interacts with the vehicle control unit 40 to drive the vehicle control unit 40 to supply high voltage to the vehicle, and the vehicle control unit 40 feeds back the vehicle state to the low-voltage battery 30 after the vehicle supply high voltage. The low-voltage battery 30 detection module detects the current battery state in real time when the whole vehicle is in a high-voltage state, and the current battery state at least comprises the current electric quantity. And judging whether the current electric quantity is lower than a preset threshold value, wherein the preset threshold value is a critical value which is set in advance and used for distinguishing whether the electric quantity reaches full electricity, if the current electric quantity is lower than the preset threshold value, the electric quantity of the battery is represented to be not up to full electricity, at the moment, the control module of the low-voltage battery 30 starts a charging mode, the charging voltage of the request is estimated according to the current battery state, the charging request is generated according to the estimated charging voltage, and the charging request is sent to the vehicle control unit 40.
The vehicle control unit 40 is configured to send a voltage control command to the high voltage conversion device 20 in response to the charging request.
It should be understood that the vehicle control unit 40, upon receiving the charging request, analyzes the charging request, determines the charging voltage requested by the low-voltage battery 30, generates a voltage control command according to the charging voltage, and transmits the voltage control command to the high-voltage conversion device 20.
The high voltage conversion device 20 is configured to respond to the voltage control instruction to convert the high voltage power distribution output by the high voltage power supply device 10, and output the converted low voltage power distribution to the low voltage battery 30 for charging.
Note that, the high voltage conversion device 20 includes: the device comprises a voltage transformation module, a detection module, a communication module and a control module, wherein the voltage transformation module is used for converting high voltage into low voltage and supplying power to a low-voltage load 50 to normally work and a low-voltage battery 30 to normally charge; the detection module is mainly used for detecting the states of the high-voltage conversion device 20, such as output voltage and output current, so that the low-voltage battery 30 can monitor the output state of the high-voltage conversion device 20 in real time; the communication module is mainly used for realizing information interaction with the vehicle control unit 40, so that the vehicle control unit 40 can monitor the state of the high-voltage conversion device 20 in real time conveniently; the control module is mainly used for controlling the output voltage of the high voltage conversion device 20.
It should be understood that the high voltage power supply 10 is a power battery for outputting high voltage distribution, and the high voltage converting device 20 converts high voltage into low voltage for outputting low voltage distribution. In a specific implementation, the high voltage conversion device 20 determines an output voltage according to the voltage control instruction, and the control module of the high voltage conversion device 20 performs conversion control according to the output voltage, so that the high voltage power supply device 10 meets the charging requirement of the low voltage battery 30 through low voltage power distribution converted by the high voltage conversion device 20.
Further, the low-voltage battery 30 is further configured to query a corresponding optimal charging current and an optimal voltage according to the current battery state, calculate an output voltage according to the optimal charging current and the optimal voltage, and send a charging request according to the output voltage.
In a specific implementation, a mapping table among the battery state, the optimal charging current, and the optimal voltage is stored in advance, the optimal charging current and the optimal voltage can be determined by querying the mapping table based on the current battery state, the output voltage of the high-voltage conversion device 20 is estimated according to the optimal charging current and the optimal voltage, a charging request is generated according to the output voltage, and the charging request is sent to the vehicle controller 40.
Alternatively, the load voltage and the line loss voltage in the power supply circuit are estimated, and the output voltage is determined according to the load voltage, the line loss voltage and the optimal voltage, so that the low-voltage distribution output by the high-voltage conversion device 20 meets the charging requirement of the low-voltage battery 30.
Specifically, the current battery state includes a current temperature and a current electric quantity, and different temperatures, different electric quantities, and corresponding optimal charging currents and optimal voltages are stored in the low-voltage battery 30.
It can be understood that, according to the cell material and characteristics selected by the low-voltage battery 30, and the like, and considering comprehensively the temperature rise, and other factors, the optimal charging current and the optimal voltage of the low-voltage battery 30 in different states (temperature and electric quantity) are determined through experimental tests, where the optimal charging current refers to the maximum charging current allowed in the current state of the battery, and represents the optimal charging state most suitable for the current state, and the service life of the battery in the charging state can be prolonged, and the optimal voltage refers to the maximum voltage allowed in the current state of the battery, and represents the optimal charging voltage in the current state of the battery, and the charging voltage can make the charging battery in the current state reach the optimal charging current.
As shown in fig. 2, fig. 2 is a schematic diagram of a relationship curve between a requested voltage, a charging current and an electric quantity of the low-voltage battery charging control system of the present invention, and an optimal voltage and an optimal charging current corresponding to the electric quantity are unique at any time in the whole charging process. The voltage versus charge curve in fig. 2 indicates that: during the whole charging process, the requested voltage increases along with the increase of the electric quantity. The current versus charge curve in fig. 2 shows: in the early stage of charging, the charging current can be increased along with the increase of the electric quantity; in the later charging period, the charging current can be reduced along with the increase of the electric quantity.
Referring to table 1, table 1 is a mapping relationship schematic table of the present invention, where the table includes two query dimensions of temperature and electric quantity, respectively, and the values stored in the table include a voltage value U and a current value I, for example, when the current temperature is 25 ℃ and the current electric quantity is 85%, the optimal charging current is determined as I by looking up the table BAT1 The optimum voltage is U BAT1 。
Table 1:
further, the low-voltage battery 30 is further configured to send a charging stop request to the vehicle control unit 40 when it is detected that the current electric quantity reaches the preset threshold;
the vehicle control unit 40 is further configured to send a charging stop instruction to the high voltage conversion device 20 in response to the charging stop request.
It should be noted that the detection module of the low-voltage battery 30 detects the current electric quantity in real time, and when the current electric quantity reaches a preset threshold, it indicates that the battery electric quantity reaches full charge, at this time, a charging stop request is generated, and the charging stop request is sent to the vehicle controller 40, so that the vehicle controller 40 controls the high-voltage conversion device 20 to stop transmitting low-voltage power to the low-voltage battery 30. In a specific implementation, the low-voltage battery 30 estimates a load voltage and a line loss voltage, generates a charge stop request according to the load voltage and the line loss voltage, and the vehicle controller 40 controls the output voltage of the high-voltage conversion device 20 to be the sum of the load voltage and the line loss voltage.
In a specific implementation, referring to fig. 3, fig. 3 is a schematic block diagram of a low-voltage battery of the low-voltage battery charging control system according to the present invention, and an internal detection module of the low-voltage battery 30 detects a terminal voltage and a current of the low-voltage battery 30 in real time, and determines whether a current charging state of the low-voltage battery 30 is in a charging state according to the detected voltage and current, so as to evaluate whether the entire charging system is normal.
The low-voltage battery charging control system proposed by the present embodiment includes: the vehicle control system comprises a high-voltage power supply device, a high-voltage conversion device, a low-voltage battery, and a vehicle control unit, wherein the high-voltage power supply device, the high-voltage conversion device and the low-voltage battery are sequentially connected; when the whole vehicle is in a high-voltage state, the low-voltage battery detects the current battery state, and when the current electric quantity is lower than a preset threshold, a charging mode is started, and a charging request is sent according to the current battery state; the vehicle control unit responds to the charging request and sends a voltage control instruction to the high-voltage conversion device; the high-voltage conversion device responds to the voltage control instruction to convert the high-voltage power distribution output by the high-voltage power supply device, and outputs the converted low-voltage power distribution to the low-voltage battery for charging. Through the mode, the charging request voltage is accurately estimated according to the current battery state, the output voltage of the high-voltage conversion device is dynamically adjusted, so that the low-voltage battery is always in the optimal charging state, the battery charging efficiency is improved, and the influence of the load fluctuation of the whole vehicle on the service life of the battery is effectively avoided.
Referring to fig. 4, fig. 4 is a block diagram illustrating a second embodiment of a low-voltage battery charging control system according to the present invention.
Based on the first embodiment, the charging control system for the low-voltage battery 30 of the present embodiment further includes a low-voltage load 50, a target connection point 60 is provided on a connection line between the high-voltage conversion device 20 and the low-voltage battery 30, and the low-voltage load 50 is connected to the target connection point 60;
the high voltage converting apparatus 20 is further configured to supply power to the low voltage load 50.
The low-voltage battery 30 is further configured to determine a load current corresponding to the low-voltage load 50, a first wire harness resistance between the high-voltage conversion device 20 and the target connection point 60, and a second wire harness resistance between the target connection point 60 and the low-voltage battery 30, calculate a first voltage according to the load current, the optimal charging current, and the first wire harness resistance, calculate a second voltage according to the optimal charging current and the second wire harness resistance, and calculate an output voltage according to the first voltage, the second voltage, and the optimal voltage.
Specifically, the output voltage is calculated by the following formula:
U AB ＝(I BAT +∑(I low-voltage load ))R AB ；
U BD ＝I BAT R BD ；
U＝U AB +U BD +U BAT ；
Wherein, Σ (I) Low-voltage load ) Is the load current, R AB Is a first wiring harness resistance, R BD Is a second wire harness resistance, I BAT For optimum charging current, U AB Is a first voltage, U BD At a second voltage, U BAT For optimum voltage, U is the output voltage.
It should be understood that, alternatively, the measured load current, the first wire resistance and the second wire resistance are stored in advance, and parameters required for calculation are acquired from the corresponding storage areas when calculating the output voltage.
It should be noted that the first voltage represents the trunk wiring harness voltage drop, the second voltage represents the battery terminal wiring harness voltage drop, referring to fig. 5, fig. 5 is a schematic diagram of the high voltage conversion device, the load and the low voltage battery arrangement of the low voltage battery charging control system of the present invention, and the target connection point 60 is a point B in fig. 5, and it is assumed that T is T 1 At that time, the optimum charging current is found to be I according to the current battery state of the low-voltage battery 30 BAT1 The optimum voltage is U BAT1 The voltage drop (namely AB section voltage) of the trunk line harness is U AB1 And the voltage drop of the wire harness at the battery end (namely the voltage of the BD section) is represented as U BD1 The output voltage U is calculated by the following formula 1 ：
U 1 ＝U AB1 +U BD1 +U BAT1 。
Suppose T 2 At that time, the optimum charging current is found to be I according to the current battery state of the low-voltage battery 30 BAT2 The optimum voltage is U BAT2 AB section voltage is U AB2 BD segment voltage is U BD2 The output voltage U is calculated by the following formula 1 ：
U 2 ＝U AB2 +U BD2 +U BAT2 。
Wherein, AB section voltage U AB2 Comprises the following steps:
U AB2 ＝I AB2 R AB ＝(I BAT2 +I BC2 )R AB ；
current I at BC stage BC2 Comprises the following steps:
I BC2 ＝∑(I low-voltage load )＝I bC201 +I BC202 +……+I BC20n ；
Voltage U of BD segment BD2 Comprises the following steps:
U BD2 ＝I AD2 R AB ＝I BAT2 R BD ；
specifically, the first and second beam resistances are calculated according to the following manner:
the resistance of the BD segment is:
R BD ＝ρ 1 L BD /S BD ；
wherein rho 1 is the resistivity of the BD segment wire harness; l is BD BD harness length; s. the BD Is the sectional area of the BD wire harness;
the resistance of the AB segment is:
R AB ＝ρ 2 L AB /S AB ；
wherein rho 2 is the resistivity of the AB section wire bundle; l is AB Is the length of the AB wire harness; s AB Is the AB beam cross-sectional area.
It should be noted that, the number of the low-voltage loads 50 is large, the power consumption of the same load may fluctuate during normal operation, and the power consumption of the entire vehicle may fluctuate due to the turn-off of different loads, which causes the load current I BC2 The requested output voltage of the low-voltage battery 30 is calculated in real time through the estimation method, and the requested output voltage is always kept at the optimal voltage value, so that the low-voltage battery 30 can be charged by the optimal charging current in the current state all the time, and the charging efficiency of the low-voltage battery 30 is greatly improved.
Optionally, the low voltage battery 30 is further configured to, when detecting a change in electric quantity or a change in temperature, query a current variation and a voltage variation according to the electric quantity variation or the temperature variation, calculate an output voltage variation according to the current variation and the voltage variation, and send a charging adjustment request according to the voltage variation.
In one implementation, the low-voltage battery 30 queries the first current and the first voltage according to the pre-change power and the pre-change temperature, queries the second current and the second voltage according to the post-change power and the post-change temperature, determines the current variation according to the first current and the second current, determines the voltage variation according to the second current and the second voltage, and calculates the output transformation variation by the following formula:
ΔU＝I ΔBAT (R AB +R BD )+U ΔBAT 。
wherein, Δ U is the output voltage variation; i is ΔBAT Is the current variation; u shape ΔBAT Is the voltage variation.
A charging adjustment request is sent to the vehicle control unit 40 according to the voltage variation, and the vehicle control unit 40 controls the high-voltage conversion device 20 to adjust the output voltage according to the charging adjustment request.
According to the embodiment, the output voltage of the charging request is accurately estimated according to the current battery state, the load voltage and the harness loss voltage, the output voltage of the high-voltage conversion device is dynamically adjusted, so that the low-voltage battery is always in the optimal charging state, the charging efficiency of the low-voltage battery is greatly improved, and the influence of the load fluctuation of the whole vehicle on the service life of the battery is effectively avoided.
Referring to fig. 6, fig. 6 is a block diagram illustrating a third embodiment of a low-voltage battery charging control system according to the present invention.
Based on the second embodiment, the high voltage conversion device 20 of the present embodiment is connected to the low voltage battery 30 in communication;
the high voltage conversion device 20 is further configured to detect an actual output current and an actual output voltage of the high voltage conversion device 20 when the low voltage battery 30 is in a charging state, and send the actual output current and the actual output voltage of the high voltage conversion device 20 to the low voltage battery 30.
It should be understood that the high voltage converting apparatus 20 interactively communicates with the low voltage battery 30, determines the state of the low voltage battery 30 according to the interactive information, and when it is determined that the low voltage battery 30 is in the charged state, the detection module of the high voltage converting apparatus 20 detects the actual output current and the actual output voltage of the high voltage converting apparatus 20 and communicates with the low voltage battery 30 to transmit the actual output current and the actual output voltage.
The low-voltage battery 30 is further configured to detect an actual charging current and an actual input voltage of the low-voltage battery 30 when the low-voltage battery 30 is in a charging state, calculate a first wire harness resistivity and a second wire harness resistivity in a current state according to the actual output voltage of the high-voltage conversion device 20 and the actual input voltage of the low-voltage battery 30 when the actual charging current of the low-voltage battery 30 is smaller than the optimal charging current, the actual output current of the high-voltage conversion device 20 is smaller than a target output current, and a first current difference is equal to a second current difference, recalculate a corrected output voltage according to the current state based on the first wire harness resistivity and the second wire harness resistivity, and issue a charging request according to the corrected output voltage, wherein the first current difference is a current difference between the target output current and the actual output current of the high-voltage conversion device 20, and the second current difference is a current difference between the optimal charging current and the actual charging current of the low-voltage battery 30.
It should be noted that, referring to fig. 7, fig. 7 is a graph of a current variation during the charging process of the low-voltage battery charging control system of the present invention, and a real current during the charging process fluctuates around a target current value under the influence of interference factors, and may exceed a maximum allowable charging current of the low-voltage battery 30 in a serious case, which affects a service life of the low-voltage battery 30.
In a specific implementation, the actual charging current detected by the detection module of the low-voltage battery 30 in real time is assumed to be I 10 (optimum charging Current is I 1 ) The actual input voltage is U 10 (optimum voltage is U) 1 ) The actual output current detected by the detection module of the high voltage conversion device 20 in real time is I A0 Actual output voltage is U A0 Target output current I A Being a main roadAnd the ideal current is calculated according to the optimal charging current and the load current, and the ideal current is obtained by the following steps: i is A ＝I 1 +I n Wherein, I n Is the load current. Referring to fig. 8, fig. 8 is a schematic diagram illustrating a specific working process of the low-voltage battery charging control system according to the present invention; the whole vehicle is in a high-voltage state, the electric quantity of the low-voltage battery is detected in real time through the detection module of the low-voltage battery, when the electric quantity of the battery is less than 100%, the charging mode of the battery is started, the current temperature and the current electric quantity of the battery are detected through the detection module of the low-voltage battery, the optimal voltage U of the battery is obtained by looking up a table BAT And an optimum charging current I BAT According to the optimum charging current I BAT Estimating a trunk line voltage drop U AB And the voltage drop U of the wire harness at the battery end BD The control module sends out a charging request voltage U, U = U AB +U BD +U BAT The vehicle control unit receives the battery charging request voltage U and sends an output voltage U instruction to the high-voltage conversion device, the high-voltage conversion device outputs the voltage U according to the requirement after receiving the output voltage instruction, the low-voltage battery starts to be charged according to the request voltage U, and the detection module of the low-voltage battery detects the actual charging current I of the battery end in real time 10 The actual output current I of the main trunk of the detection module through the high-voltage conversion device A0 And judging whether the estimation of the resistivity of the wiring harness is inaccurate or the estimation of the load power is inaccurate according to the monitored data, thereby correcting the estimated parameters and the output voltage of the charging request.
If I 10 ＜I 1 And I A0 ＜I A And I is A -I A0 ＝I 1 -I 10 If the charging current is smaller than the target value, the reason for judging that the estimation of the harness resistance value is larger, and the harness resistivity rho slightly changes due to the difference between the harness temperature and the conduction current. In the present embodiment, the actual input voltage U of the low-voltage battery 30 is detected by the current 10 And the actual output voltage U of the high voltage conversion device 20 A0 By:
U AB ＝I AB R AB ＝(I BAT +I BC )R AB ＝(I BAT +I BC )ρ 2 L AB /S AB (ii) a And
I BC ＝∑(I low-voltage load )＝I BC201 +I BC202 +……+I BC20n ；
Deducing and calculating resistivity rho under the current state 2 Wherein, I BAT I.e. I 1 。
By:
U BD ＝I BAT R BD ＝I BAT ρ 1 L BD /S BD ；
deducing and calculating resistivity rho under the current state 1 。
And re-estimating the requested output voltage in the current state according to the deduced and calculated real resistivity and the current state, sending a charging request, sending an output voltage instruction to the high-voltage conversion device 20 when the vehicle controller 40 receives the charging request, and outputting the corresponding voltage after the high-voltage conversion device 20 receives the output voltage instruction. Although the service life of the battery is not affected by the large estimation of the resistivity of the wiring harness, the charging efficiency of the low-voltage battery 30 is affected, and the problem of large estimation of the resistivity of the wiring harness can be effectively solved through real-time checking and correction, so that the charging efficiency of the low-voltage battery 30 is improved.
The low-voltage battery 30 is further configured to calculate a first harness resistivity and a second harness resistivity in a current state according to an actual output voltage of the high-voltage conversion device 20 and an actual input voltage of the low-voltage battery 30 when an actual charging current of the low-voltage battery 30 is greater than the optimal charging current, an actual output current of the high-voltage conversion device 20 is greater than a target output current, and a third current difference is equal to a fourth current difference, recalculate a corrected output voltage according to the current state based on the first harness resistivity and the second harness resistivity, and issue a charging request according to the corrected output voltage, wherein the third current difference is a current difference between the actual output current of the high-voltage conversion device 20 and the target output current, and the fourth current difference is a current difference between the actual charging current of the low-voltage battery 30 and the optimal charging current.
It should be understood thatRefer to FIG. 8, if I 10 ＞I 1 And I is A0 ＞I A And I is A0 -I A ＝I 10 -I 1 If the charging current is larger than the target value, the reason for judging that the estimation of the harness resistance value is small, and the harness resistivity rho can slightly change due to the difference between the harness temperature and the conduction current. By the currently detected actual input voltage U of the low-voltage battery 30 10 And the actual output voltage U of the high voltage conversion device 20 A0 By:
U AB ＝I AB R AB ＝(I BAT +I BC )R AB ＝(I BAT +I BC )ρ 2 L AB /S AB (ii) a And
I BC ＝∑(I low-voltage load )＝I BC201 +I BC202 +……+I BC20n ；
Deducing and calculating resistivity rho in the current state 2 Wherein, I BAT I.e. I 1 。
By:
U BD ＝I BAT R BD ＝I BAT ρ 1 L BD /S BD ；
deducing and calculating resistivity rho under the current state 1 。
And re-estimating the requested output voltage in the current state according to the deduced and calculated real resistivity and the current state, sending a charging request, sending an output voltage instruction to the high-voltage conversion device 20 when the vehicle controller 40 receives the charging request, and outputting the corresponding voltage after the high-voltage conversion device 20 receives the output voltage instruction. Although the estimation of the resistivity of the wiring harness is smaller, the charging efficiency is improved, the service life of the low-voltage battery 30 is influenced, and the problem of the estimation of the resistivity of the wiring harness is smaller can be effectively solved through real-time checking and correction, so that the service life of the low-voltage battery 30 is prolonged.
The low-voltage battery 30 is further configured to calculate a target load current in a current state according to an actual output voltage of the high-voltage conversion device 20 and an actual input voltage of the low-voltage battery 30 when the actual charging current is smaller than the optimal charging current and the actual output current of the high-voltage conversion device 20 is equal to the target output current, recalculate a corrected output voltage according to the current state based on the target load current, and send a charging request according to the corrected output voltage.
In addition, referring to FIG. 8, if I 10 ＜I 1 And I A0 ＝I A If the charging current is larger than the target value, the reason for judging that the charging current is larger than the target value is that the power consumption estimation of the load end is small, the load end has more loads, and the power consumption at different moments fluctuates. By the currently detected actual input voltage U of the low-voltage battery 30 10 And the actual output voltage U of the high voltage conversion device 20 A0 By:
U AB ＝I AB R AB ＝(I BAT +I BC )R AB ＝(I BAT +I BC )ρ 2 L AB /S AB (ii) a And
I BC ＝∑(I low-voltage load )＝I BC201 +I BC202 +……+I BC20n ；
And deducing and calculating the power consumption of the load end in the current state. And re-estimating the requested output voltage in the current state according to the deduced and calculated power consumption of the load end and the current state, sending a charging request, sending an output voltage instruction to the high-voltage conversion device 20 when the vehicle controller 40 receives the charging request, and outputting the corresponding voltage after the high-voltage conversion device 20 receives the output voltage instruction. Although the service life of the battery is not affected by the smaller power consumption estimation of the load end, the charging efficiency of the low-voltage battery 30 is affected, and the problem of the smaller power consumption estimation of the load end can be effectively solved through real-time checking and correction, so that the charging efficiency of the low-voltage battery 30 is improved.
The low-voltage battery 30 is further configured to, when the actual charging current of the low-voltage battery 30 is greater than the optimal charging current and the actual output current of the high-voltage conversion device 20 is equal to the target output current, calculate a target load current in the current state according to the actual output voltage of the high-voltage conversion device 20 and the actual input voltage of the low-voltage battery 30, recalculate the corrected output voltage according to the current state based on the target load current, and send a charging request according to the corrected output voltage.
It should be understood that, referring to FIG. 8, if I 10 ＞I 1 And I A0 ＝I A If the charging current is smaller than the target value, the reason for judging that the charging current is smaller than the target value is that the power consumption estimation of the load end is larger, the number of loads of the load end is larger, and the power consumption at different moments fluctuates. By the currently detected actual input voltage U of the low-voltage battery 30 10 And the actual output voltage U of the high voltage conversion device 20 A0 By:
U AB ＝I AB R AB ＝(I BAT +I BC )R AB ＝(I BAT +I BC )ρ 2 L AB /S AB (ii) a And
I BC ＝∑(I low-voltage load )＝I BC201 +I BC202 +……+I BC20n ；
And deducing and calculating the power consumption of the load end in the current state. And re-estimating the requested output voltage in the current state according to the deduced and calculated power consumption of the load end and the current state, sending a charging request, sending an output voltage instruction to the high-voltage conversion device 20 when the vehicle controller 40 receives the charging request, and outputting the corresponding voltage after the high-voltage conversion device 20 receives the output voltage instruction. Although the charging efficiency is improved by estimating the power consumption of the load end to be larger, the service life of the low-voltage battery 30 is influenced, and the problem of smaller power consumption of the load end can be effectively solved by checking and correcting in real time, so that the service life of the low-voltage battery 30 is prolonged.
In addition, I 10 ＝I 1 And I A0 ＝I A It is determined that the low-voltage battery 30 is in the optimum state of charge.
In the embodiment, the interference factors in the charging process are accurately identified, the output voltage of the charging request is corrected in time, the influence of the load fluctuation of the whole vehicle and the estimation deviation of the resistivity of the wire harness on the output voltage can be effectively avoided, the charging current value deviation caused by interference is prevented, the charging efficiency of the low-voltage battery is influenced, and the service life of the low-voltage battery is prolonged, so that the charging stability of the low-voltage battery is improved.
Referring to fig. 9, fig. 9 is a flowchart illustrating a first embodiment of a method for controlling charging of a low-voltage battery according to the present invention.
As shown in fig. 9, the low-voltage battery charging control method provided in the embodiment of the present invention is applied to the low-voltage battery charging control system described above, and the low-voltage battery charging control system includes: the system comprises a high-voltage power supply device, a high-voltage conversion device, a low-voltage battery, and a vehicle control unit, wherein the high-voltage power supply device, the high-voltage conversion device and the low-voltage battery are sequentially connected;
the low-voltage battery charging control method comprises the following steps:
step S10: and when the whole vehicle is in a high-voltage state, the low-voltage battery detects the current battery state, and when the current electric quantity is lower than a preset threshold value, the charging mode is started, and a charging request is sent according to the current battery state.
Step S20: and the vehicle control unit responds to the charging request and sends a voltage control command to the high-voltage conversion device.
Step S30: and the high-voltage conversion device responds to the voltage control instruction to convert the high-voltage power distribution output by the high-voltage power supply device and output the converted low-voltage power distribution to the low-voltage battery for charging.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited in this respect.
The low-voltage battery charging control system proposed by the present embodiment includes: the vehicle control system comprises a high-voltage power supply device, a high-voltage conversion device, a low-voltage battery, and a vehicle control unit, wherein the high-voltage power supply device, the high-voltage conversion device and the low-voltage battery are sequentially connected; when the whole vehicle is in a high-voltage state, the low-voltage battery detects the current battery state, and when the current electric quantity is lower than a preset threshold, a charging mode is started, and a charging request is sent according to the current battery state; the vehicle control unit responds to the charging request and sends a voltage control instruction to the high-voltage conversion device; the high-voltage conversion device responds to the voltage control instruction to convert the high-voltage power distribution output by the high-voltage power supply device, and outputs the converted low-voltage power distribution to the low-voltage battery for charging. Through the mode, the charging request voltage is accurately estimated according to the current battery state, the output voltage of the high-voltage conversion device is dynamically adjusted, so that the low-voltage battery is always in the optimal charging state, the battery charging efficiency is improved, and the influence of the load fluctuation of the whole vehicle on the service life of the battery is effectively avoided.
It should be noted that the above-mentioned work flows are only illustrative and do not limit the scope of the present invention, and in practical applications, those skilled in the art may select some or all of them according to actual needs to implement the purpose of the solution of the present embodiment, and the present invention is not limited herein.
In addition, the technical details that are not described in detail in this embodiment can be referred to the low-voltage battery charging control system provided in any embodiment of the present invention, and are not described herein again.
In one embodiment, the sending out the charging request by the low-voltage battery according to the current battery state comprises:
and the low-voltage battery inquires corresponding optimal charging current and optimal voltage according to the current battery state, calculates output voltage according to the optimal charging current and the optimal voltage, and sends out a charging request according to the output voltage.
In an embodiment, the low-voltage battery charging control system further includes a low-voltage load, a target connection point is arranged on a connection line between the high-voltage conversion device and the low-voltage battery, and the low-voltage load is connected with the target connection point;
the method further comprises the following steps:
the high-voltage conversion device supplies power to the low-voltage load;
the low-voltage battery calculates an output voltage according to the optimal charging current and the optimal voltage, and comprises the following steps:
the low-voltage battery determines a load current corresponding to the low-voltage load, a first wire harness resistance between the high-voltage conversion device and the target connection point, and a second wire harness resistance between the target connection point and the low-voltage battery, calculates a first voltage according to the load current, the optimal charging current and the first wire harness resistance, calculates a second voltage according to the optimal charging current and the second wire harness resistance, and calculates an output voltage according to the first voltage, the second voltage and the optimal voltage.
In one embodiment, the current battery state includes a current temperature and a current electric quantity, and the low-voltage battery stores different temperatures, different electric quantities, and corresponding optimal charging currents and optimal voltages.
In one embodiment, the high voltage conversion device is in communication with the low voltage battery;
after the step S30, the method further includes:
the high-voltage conversion device detects the actual output current and the actual output voltage of the high-voltage conversion device when the low-voltage battery is in a charging state, and sends the actual output current and the actual output voltage of the high-voltage conversion device to the low-voltage battery;
the method comprises the steps of detecting actual charging current and actual input voltage of a low-voltage battery when the low-voltage battery is in a charging state, calculating first harness resistivity and second harness resistivity in a current state according to the actual output voltage of a high-voltage conversion device and the actual input voltage of the low-voltage battery when the actual charging current of the low-voltage battery is smaller than the optimal charging current, the actual output current of the high-voltage conversion device is smaller than target output current and first current difference is equal to second current difference, recalculating corrected output voltage according to the current state based on the first harness resistivity and the second harness resistivity, and sending a charging request according to the corrected output voltage, wherein the first current difference is a current difference value between the target output current and the actual output current of the high-voltage conversion device, and the second current difference is a current difference value between the optimal charging current and the actual charging current of the low-voltage battery.
In one embodiment, after detecting the actual charging current and the actual input voltage of the low-voltage battery when the low-voltage battery is in the charging state, the method further comprises:
when the actual charging current of the low-voltage battery is larger than the optimal charging current, the actual output current of the high-voltage conversion device is larger than the target output current, and a third current difference is equal to a fourth current difference, calculating a first wire harness resistivity and a second wire harness resistivity in the current state according to the actual output voltage of the high-voltage conversion device and the actual input voltage of the low-voltage battery, recalculating a corrected output voltage according to the current state based on the first wire harness resistivity and the second wire harness resistivity, and sending a charging request according to the corrected output voltage, wherein the third current difference is a current difference value between the actual output current of the high-voltage conversion device and the target output current, and the fourth current difference is a current difference value between the actual charging current of the low-voltage battery and the optimal charging current.
In one embodiment, after detecting the actual charging current and the actual input voltage of the low-voltage battery when the low-voltage battery is in the charging state, the method further comprises:
and when the actual charging current of the low-voltage battery is smaller than the optimal charging current and the actual output current of the high-voltage conversion device is equal to the target output current, the low-voltage battery calculates the target load current in the current state according to the actual output voltage of the high-voltage conversion device and the actual input voltage of the low-voltage battery, recalculates the corrected output voltage according to the current state based on the target load current, and sends a charging request according to the corrected output voltage.
In one embodiment, after detecting the actual charging current and the actual input voltage of the low-voltage battery when the low-voltage battery is in the charging state, the method further comprises:
and when the actual charging current of the low-voltage battery is larger than the optimal charging current and the actual output current of the high-voltage conversion device is equal to the target output current, the low-voltage battery calculates the target load current in the current state according to the actual output voltage of the high-voltage conversion device and the actual input voltage of the low-voltage battery, recalculates the corrected output voltage according to the current state based on the target load current, and sends a charging request according to the corrected output voltage.
In an embodiment, after the step S30, the method further includes:
when the low-voltage battery detects that the current electric quantity reaches the preset threshold value, a charging stop request is sent to the vehicle controller;
and the vehicle control unit responds to the charging stop request and sends a charging stop instruction to the high-voltage conversion device.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A low-voltage battery charge control system, comprising: the system comprises a high-voltage power supply device, a high-voltage conversion device, a low-voltage battery, and a vehicle control unit, wherein the high-voltage power supply device, the high-voltage conversion device and the low-voltage battery are sequentially connected;
the low-voltage battery is used for detecting the current battery state when the whole vehicle is in the high-voltage state, starting a charging mode when the current electric quantity is lower than a preset threshold value, and sending a charging request according to the current battery state;
the vehicle control unit is used for responding to the charging request and sending a voltage control command to the high-voltage conversion device;
and the high-voltage conversion device is used for responding to the voltage control instruction to convert the high-voltage power distribution output by the high-voltage power supply device and outputting the converted low-voltage power distribution to the low-voltage battery for charging.
2. The charging control system for the low-voltage battery according to claim 1, wherein the low-voltage battery is further configured to query a corresponding optimal charging current and an optimal voltage according to the current battery state, calculate an output voltage according to the optimal charging current and the optimal voltage, and issue a charging request according to the output voltage.
3. The low-voltage battery charging control system according to claim 2, further comprising a low-voltage load, wherein a target connection point is provided on a connection line between the high-voltage conversion device and the low-voltage battery, and the low-voltage load is connected to the target connection point;
the high-voltage conversion device is also used for supplying power to the low-voltage load;
the low-voltage battery is further configured to determine a load current corresponding to the low-voltage load, a first wire harness resistance between the high-voltage conversion device and the target connection point, and a second wire harness resistance between the target connection point and the low-voltage battery, calculate a first voltage according to the load current, the optimal charging current, and the first wire harness resistance, calculate a second voltage according to the optimal charging current and the second wire harness resistance, and calculate an output voltage according to the first voltage, the second voltage, and the optimal voltage.
4. The low voltage battery charge control system according to claim 2, wherein the current battery state includes a current temperature and a current charge amount, and different temperatures, different charge amounts, and corresponding optimal charge currents and optimal voltages are stored in the low voltage battery.
5. The low-voltage battery charge control system of claim 3, wherein said high-voltage switching device is communicatively coupled to said low-voltage battery;
the high-voltage conversion device is also used for detecting the actual output current and the actual output voltage of the high-voltage conversion device when the low-voltage battery is in a charging state, and sending the actual output current and the actual output voltage of the high-voltage conversion device to the low-voltage battery;
the low-voltage battery is further configured to detect an actual charging current and an actual input voltage of the low-voltage battery when the low-voltage battery is in a charging state, calculate a first harness resistivity and a second harness resistivity in a current state according to an actual output voltage of the high-voltage conversion device and an actual input voltage of the low-voltage battery when the actual charging current of the low-voltage battery is smaller than the optimal charging current, an actual output current of the high-voltage conversion device is smaller than a target output current, and a first current difference is equal to a second current difference, recalculate a corrected output voltage according to the current state based on the first harness resistivity and the second harness resistivity, and send a charging request according to the corrected output voltage, wherein the first current difference is a current difference between the target output current and the actual output current of the high-voltage conversion device, and the second current difference is a current difference between the optimal charging current and the actual charging current of the low-voltage battery.
6. The low-voltage battery charge control system according to claim 5, wherein the low-voltage battery is further configured to calculate a first strand resistivity and a second strand resistivity in a current state from an actual output voltage of the high-voltage conversion device and an actual input voltage of the low-voltage battery when an actual charge current of the low-voltage battery is larger than the optimal charge current, an actual output current of the high-voltage conversion device is larger than a target output current, and a third current difference is equal to a fourth current difference between the actual charge current and the optimal charge current of the low-voltage battery, recalculate a corrected output voltage from the current state based on the first strand resistivity and the second strand resistivity, and issue a charge request according to the corrected output voltage.
7. The low-voltage battery charge control system according to claim 5, wherein the low-voltage battery is further configured to calculate a target load current in a current state from an actual output voltage of the high-voltage switching device and an actual input voltage of the low-voltage battery when an actual charge current of the low-voltage battery is smaller than the optimal charge current and an actual output current of the high-voltage switching device is equal to a target output current, recalculate a corrected output voltage in accordance with the current state based on the target load current, and issue a charge request in accordance with the corrected output voltage.
8. The low-voltage battery charging control system according to claim 5, wherein the low-voltage battery is further configured to calculate a target load current in a current state from an actual output voltage of the high-voltage switching device and an actual input voltage of the low-voltage battery when an actual charging current of the low-voltage battery is greater than the optimal charging current and an actual output current of the high-voltage switching device is equal to a target output current, recalculate a corrected output voltage from the current state based on the target load current, and issue a charging request according to the corrected output voltage.
9. The low-voltage battery charging control system according to any one of claims 1-8, wherein the low-voltage battery is further configured to send a charging stop request to the vehicle control unit when detecting that the current power amount reaches the preset threshold;
and the vehicle control unit is also used for responding to the charging stop request and sending a charging stop instruction to the high-voltage conversion device.
10. A low-voltage battery charge control method applied to a low-voltage battery charge control system according to any one of claims 1 to 9, the low-voltage battery charge control system comprising: the system comprises a high-voltage power supply device, a high-voltage conversion device, a low-voltage battery, and a vehicle control unit, wherein the high-voltage power supply device, the high-voltage conversion device and the low-voltage battery are sequentially connected;
the low-voltage battery charging control method comprises the following steps:
when the whole vehicle is in a high-voltage state, the low-voltage battery detects the current battery state, and when the current electric quantity is lower than a preset threshold value, a charging mode is started, and a charging request is sent according to the current battery state;
the vehicle control unit responds to the charging request and sends a voltage control instruction to the high-voltage conversion device;
and the high-voltage conversion device responds to the voltage control instruction to convert the high-voltage power distribution output by the high-voltage power supply device and outputs the converted low-voltage power distribution to the low-voltage battery for charging.
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| CN116494825B (en) * | 2023-03-24 | 2024-04-30 | 重庆赛力斯凤凰智创科技有限公司 | Vehicle-mounted lithium battery management method and device |
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