Charging system of low-voltage battery and vehicle

Abstract

The invention provides a charging system of a low-voltage battery and a vehicle, and belongs to the technical field of vehicles. The system comprises a low-voltage battery, a data detection device, a high-voltage battery, a DCDC converter and a controller, the data detection device is used for acquiring current state information of the low-voltage battery and sending the current state information to the controller; the controller is used for determining a target charging voltage corresponding to the low-voltage battery based on a corresponding relation between pre-stored state information and a charging voltage and the current state information, and sending the target charging voltage to the DCDC converter; and the DCDC converter is used for regulating the output voltage of the high-voltage battery to the received target charging voltage and outputting the target charging voltage to charge the low-voltage battery. According to the invention, the charging efficiency of the low-voltage battery is improved, and the service life of the low-voltage battery is prolonged.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of vehicles, in particular to a low-voltage battery power supplementing system and a vehicle. BACKGROUND

[0002] The low-voltage battery is an important power supply device for low-voltage loads in a vehicle. When the low-voltage battery is out of power, the high-voltage battery in the vehicle will supplement power to it through a DCDC (direct current-direct current) converter.

[0003] The current power supplementing method is that the DCDC converter reduces the high-voltage power of the high-voltage battery to a fixed voltage value and outputs the fixed voltage value to supplement power to the low-voltage battery.

[0004] Although the above power supplementing method can supplement power to the low-voltage battery, the method is too rough, resulting in low power supplementing efficiency of the low-voltage battery and shortening the service life of the low-voltage battery. SUMMARY

[0005] The present disclosure provides a low-voltage battery power supplementing system and a vehicle, which can solve the technical problems in the related art. The technical solutions are as follows:

[0006] In one aspect, the present disclosure provides a low-voltage battery power supplementing system, which includes a low-voltage battery, a data detection device, a high-voltage battery, a DCDC converter, and a controller.

[0007] The data detection device is configured to acquire current state information of the low-voltage battery and send the current state information to the controller.

[0008] The controller is configured to determine a target power supplementing voltage corresponding to the low-voltage battery based on a correspondence between pre-stored state information and power supplementing voltages and the current state information, and send the target power supplementing voltage to the DCDC converter.

[0009] The DCDC converter is configured to adjust the output voltage of the high-voltage battery to the received target power supplementing voltage and output the target power supplementing voltage to supplement power to the low-voltage battery.

[0010] In one possible implementation, the current state information includes at least one of a current temperature and a current remaining power.

[0011] In one possible implementation, the controller is further configured to:

[0012] determine whether the data detection device has failed;

[0013] If no fault occurs, the target compensation voltage corresponding to the low-voltage battery is determined, and the target compensation voltage is sent to the DCDC converter.

[0014] If a fault occurs, a preset fault compensation voltage is determined as the target compensation voltage, and the target compensation voltage is sent to the DCDC converter.

[0015] In a possible implementation, the data detection apparatus is further configured to:

[0016] The current temperature of the low-voltage battery is acquired, and the current temperature is sent to the controller.

[0017] The controller is further configured to:

[0018] It is determined whether the received current temperature is greater than or equal to a preset temperature threshold.

[0019] If yes, and the duration reaches a first preset duration, it is determined that the data detection apparatus has a fault.

[0020] In a possible implementation, the data detection apparatus is further configured to:

[0021] The current remaining capacity of the low-voltage battery is acquired, and the current remaining capacity is sent to the controller.

[0022] The controller is further configured to:

[0023] It is determined whether the received current remaining capacity is less than or equal to a preset remaining capacity threshold.

[0024] If yes, and the duration reaches a second preset duration, it is determined that the data detection apparatus has a fault.

[0025] In a possible implementation, the data detection apparatus is further configured to:

[0026] The current output voltage of the low-voltage battery is acquired, and the current output voltage is sent to the controller.

[0027] The controller is further configured to:

[0028] It is determined whether the received current output voltage is within a preset voltage range.

[0029] If no, and the duration reaches a third preset duration, it is determined that the data detection apparatus has a fault.

[0030] In a possible implementation, the DCDC converter is further configured to:

[0031] It is determined whether the controller has a signal loss fault corresponding to the target compensation voltage.

[0032] If yes, continue to charge the low-voltage battery with the currently output target charging voltage;

[0033] If no, perform the step of regulating the output voltage of the high-voltage battery to the received target charging voltage and outputting the target charging voltage to charge the low-voltage battery.

[0034] In a possible implementation, the DCDC converter is further configured to:

[0035] determine whether the target charging voltage is not received and the duration reaches a fourth preset duration;

[0036] If yes, determine that the controller has the signal loss fault.

[0037] In a possible implementation, the data detection apparatus is further configured to:

[0038] obtain a current output voltage of the low-voltage battery and send the current output voltage to the controller;

[0039] The controller is further configured to:

[0040] after determining the target charging voltage corresponding to the low-voltage battery, determine whether the current output voltage reaches the target charging voltage;

[0041] If yes, determine that the low-voltage battery does not need to be charged;

[0042] If no, perform the step of sending the target charging voltage to the DCDC converter.

[0043] In another aspect, the present disclosure further provides a vehicle comprising the low-voltage battery charging system according to any one of the preceding embodiments.

[0044] The technical solutions provided by the present disclosure have at least the following beneficial effects:

[0045] The present disclosure provides a low-voltage battery charging system. In the low-voltage battery charging system, a controller determines a target charging voltage suitable for the current state of a low-voltage battery based on current state information of the low-voltage battery, and a DCDC converter charges the low-voltage battery with the target charging voltage as the output voltage. In this way, the charging voltage of the low-voltage battery is adjusted in real time, so that the low-voltage battery is always charged at a target charging voltage suitable for its current state, thereby improving the charging efficiency of the low-voltage battery and increasing the service life of the low-voltage battery.

[0046] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0048] Figure 1 is a structural schematic diagram of a low-voltage battery power supplement system according to an embodiment of the present disclosure;

[0049] Figure 2 is a working flow schematic diagram of a low-voltage battery power supplement system according to an embodiment of the present disclosure.

[0050] LEGEND

[0051] 1, low-voltage battery; 2, data detection device; 3, high-voltage battery; 4, DCDC converter; 5, controller. DETAILED DESCRIPTION

[0052] Unless otherwise defined, technical terms or scientific terms used herein should be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which this present disclosure belongs. The terms "first", "second", "third" and similar terms used in the description and the claims of the present patent application do not denote any order, quantity, or importance, but are used to distinguish different components. Similarly, the terms "one" or "a" or "an" do not denote a quantity restriction, but mean that there is at least one. The terms "include" or "contain" or similar terms mean that the elements or objects before the "include" or "contain" cover the elements or objects listed after the "include" or "contain" and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0053] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be further described in detail below with reference to the drawings.

[0054] The embodiments of the present disclosure provide a low-voltage battery power supplement system, referring to Figure 1 and Figure 2 The low-voltage battery power supplement system includes a low-voltage battery 1, a data detection device 2, a high-voltage battery 3, a DCDC converter 4, and a controller 5.

[0055] The data detection device 2 is configured to acquire current state information of the low-voltage battery 1 and send the current state information to the controller 5.

[0056] The controller 5 is configured to determine a target charging voltage corresponding to the low-voltage battery 1 based on a correspondence between the pre-stored state information and the charging voltage and the current state information, and send the target charging voltage to the DCDC converter 4.

[0057] The DCDC converter 4 is configured to regulate the output voltage of the high-voltage battery 3 to the received target charging voltage and output the target charging voltage to charge the low-voltage battery 1.

[0058] In implementation, the data detection device 2 can acquire the current state information of the low-voltage battery 1 in real time, which can be the current situation of each parameter of the low-voltage battery 1. After acquiring the current state information, the data detection device 2 sends the current state information to the controller 5.

[0059] The controller 5 pre-stores a correspondence between the state information and the charging voltage, in which different state information corresponds to one charging voltage. The charging voltage corresponding to the state information is the optimal charging voltage when the state of the low-voltage battery 1 is the state information. Using the charging voltage to charge the low-voltage battery 1 in the state information can ensure a high charging efficiency and has the least adverse effect on the service life of the low-voltage battery 1, thereby increasing the service life of the low-voltage battery 1.

[0060] Therefore, after receiving the current state information of the low-voltage battery 1 sent by the data detection device 2, the controller 5 can determine the target charging voltage corresponding to the current state information of the low-voltage battery 1 based on the pre-stored correspondence between the state information and the charging voltage, which is the optimal charging voltage corresponding to the current state information.

[0061] Then, the controller 5 can send the determined target charging voltage to the DCDC converter 4, and the DCDC converter 4 can regulate the high voltage delivered by the high-voltage battery 3 to the target charging voltage and charge the low-voltage battery 1 after receiving the target charging voltage.

[0062] In this way, in the charging system of the low-voltage battery, the controller 5 determines a target charging voltage suitable for the current state of the low-voltage battery 1 based on the current state information of the low-voltage battery 1, and the DCDC converter 4 charges the low-voltage battery 1 with the target charging voltage as the output voltage. In this way, the charging voltage of the low-voltage battery 1 is adjusted in real time, so that the low-voltage battery 1 is always charged at a target charging voltage suitable for the current state of the low-voltage battery 1, thereby improving the charging efficiency of the low-voltage battery 1 and increasing the service life of the low-voltage battery 1.

[0063] In the embodiments of the present disclosure, the data detection device 2 can be any reasonable detection device, for example, can be a sensor module in the EBS (Electronic Brake System) in the vehicle, and the like, and the embodiments of the present disclosure do not make any limitation.

[0064] The controller 5 can be any reasonable control device, for example, can be a HCU (Hybrid Control Unit) in the vehicle, a regional controller, and the like, and the embodiments of the present disclosure do not make any limitation.

[0065] The method for the data detection device 2 to send the current state information to the controller 5 can be various, for example, the data detection device 2 can directly send the current state information to the controller 5, and for another example, the data detection device 2 can forward the current state information to the controller 5 through other devices, wherein the other devices can be any reasonable device, for example, can be a BDM (Body Control Module), and the like, and the embodiments of the present disclosure do not make any limitation.

[0066] In the embodiments of the present disclosure, the correspondence between the state information and the boost voltage pre-stored by the controller 5 can be various. For example, the boost voltage can have a linear corresponding relationship with the state information, or can also have a nonlinear relationship, which can be set according to the experimental situation and the actual demand of the low-voltage battery 1.

[0067] In addition, the current state information of the low-voltage battery 1 can include only one parameter, or can include multiple parameters.

[0068] In a possible implementation manner, the current state information can include at least one of the current temperature and the current remaining power. Correspondingly, the state information also includes at least one of the current temperature and the current remaining power.

[0069] In the embodiments of the present disclosure, the correspondence between the state information and the boost voltage can also be various, and the following will introduce several possible corresponding relationships:

[0070] In a possible implementation manner, the current state information can include the current temperature, and correspondingly, the state information includes the temperature, and then the correspondence between the boost voltage and the temperature can be that the boost voltage decreases with the increase of the temperature.

[0071] In another possible implementation, the current state information can include a current remaining power, and correspondingly, the state information includes the remaining power. In this case, the corresponding relationship between the power compensation voltage and the remaining power can be: when the remaining power is less than a first preset power value, the power compensation voltage remains unchanged; when the remaining power is greater than the first preset power value and less than a second preset power value, the power compensation voltage increases with the increase of the remaining power; and when the remaining power is greater than the second preset power value, the power compensation voltage decreases with the increase of the remaining power.

[0072] In another possible implementation, the current state information can include a current temperature and a current remaining power, and correspondingly, the state information includes the temperature and the remaining power. In this case, the corresponding relationship between the power compensation voltage and the temperature and the remaining power can be:

[0073] V = 15-2.4*SOC+1.84*SOC 2 -0.016*SOC*T

[0074] wherein V is the power compensation voltage, SOC is the remaining power, and T is the temperature.

[0075] According to the above corresponding relationship, it can be seen that the influence of the temperature on the power compensation voltage is enhanced with the increase of the remaining power. When the remaining power is high, the power compensation voltage shows a downward trend, and the power compensation voltage is close to 15V when the temperature is low and the remaining power is low.

[0076] Experiments prove that using the above corresponding relationship, the low-voltage battery 1 can be compensated with a target power compensation voltage that is more suitable for the current state of the low-voltage battery 1, thereby improving the charging efficiency of the low-voltage battery 1 and increasing the service life of the low-voltage battery 1.

[0077] Of course, in the embodiments of the present disclosure, the above corresponding relationship between the state information and the power compensation voltage is only one of several possible corresponding relationships, and the corresponding relationship can also be any other reasonable setting, which is not limited in the embodiments of the present disclosure.

[0078] In the embodiments of the present disclosure, before compensating the low-voltage battery 1, it can be determined whether the low-voltage battery 1 needs to be compensated. There are various methods for determining whether the low-voltage battery 1 needs to be compensated, and the possible methods are introduced as follows:

[0079] In one possible implementation, the method for determining whether the low-voltage battery 1 needs to be compensated can be:

[0080] The controller 5 can also be configured to: after receiving the current remaining power of the low-voltage battery 1, determine whether the current remaining power of the low-voltage battery 1 is less than a preset power threshold; if yes, determine that the low-voltage battery 1 needs to be recharged, then execute the step of "determining the target recharging voltage corresponding to the low-voltage battery 1", and then the DCDC converter 4 recharges the low-voltage battery 1 based on the target recharging voltage; if no, determine that the low-voltage battery 1 does not need to be recharged, then the step of "determining the target recharging voltage corresponding to the low-voltage battery 1" and the subsequent steps can be skipped.

[0081] In another possible implementation, the method of determining whether the low-voltage battery 1 needs to be recharged can also be:

[0082] The data detection apparatus 2 is also configured to: acquire the current output voltage of the low-voltage battery 1, and send the current output voltage to the controller 5.

[0083] The controller 5 is also configured to: after determining the target recharging voltage corresponding to the low-voltage battery 1, determine whether the current output voltage reaches the target recharging voltage; if yes, determine that the low-voltage battery 1 does not need to be recharged; if no, execute the step of sending the target recharging voltage to the DCDC converter 4.

[0084] In implementation, in addition to acquiring the current state information of the low-voltage battery 1, the data detection apparatus 2 can also acquire the current output voltage of the low-voltage battery 1, i.e., the output voltage of the low-voltage battery 1 when the low-voltage battery 1 supplies power to the load, and then send the current output voltage to the controller 5.

[0085] After receiving the current output voltage of the low-voltage battery 1 and determining the target recharging voltage corresponding to the low-voltage battery 1 based on the correspondence, the controller 5 can determine whether the current output voltage reaches the target recharging voltage. The target recharging voltage is not only a recharging voltage more suitable for the current state of the low-voltage battery 1, but also an output voltage more suitable for the current state of the low-voltage battery 1.

[0086] Therefore, if the current output voltage of the low-voltage battery 1 does not reach the target recharging voltage, it means that the low-voltage battery 1 needs to be recharged at this time, and the step of "sending the target recharging voltage to the DCDC converter 4" and the subsequent steps can be executed to recharge the low-voltage battery 1.

[0087] If the current output voltage of the low-voltage battery 1 reaches the target recharging voltage, it means that the remaining power in the low-voltage battery 1 is sufficient at this time, and the low-voltage battery 1 does not need to be recharged, so the subsequent steps of "sending the target recharging voltage to the DCDC converter 4" and the subsequent steps will not be executed.

[0088] Further, the controller 5 can also pre-store a fifth preset time length.

[0089] In the judgment of whether the low-voltage battery 1 needs to be charged, it can be judged whether the current output voltage is much greater than the target charging voltage. If it does not reach, and the duration reaches the fifth preset duration (i.e. the current output voltage received in the fifth preset duration does not reach the target charging voltage), it is determined that the low-voltage battery 1 needs to be charged. If it does not reach, but the duration also does not reach the fifth preset duration, it is determined that the low-voltage battery 1 does not need to be charged. If it reaches, it is also determined that the low-voltage battery 1 does not need to be charged.

[0090] Of course, in the embodiments of the present disclosure, the above-mentioned judgment method is only one of several possible methods for judging whether the low-voltage battery 1 needs to be charged, and it can also be any other reasonable method, and the embodiments of the present disclosure do not specifically limit this.

[0091] In the embodiments of the present disclosure, the charging system of the low-voltage battery can also monitor whether each step fails, and the monitoring method and the corresponding processing method can be as follows:

[0092] In one possible implementation, the data detection device 2 can be monitored for failure, and the method can be as follows:

[0093] The controller 5 is also used to judge whether the data detection device 2 fails, and if it does not fail, it executes the determination of the target charging voltage corresponding to the low-voltage battery 1, and if it fails, it determines the preset failure charging voltage as the target charging voltage, and executes the sending of the target charging voltage to the DCDC converter 4.

[0094] In implementation, the controller 5 has a preset failure charging voltage stored in advance, which is a voltage constant value that can reflect good charging efficiency and has little effect on the service life of the low-voltage battery 1 in various states of the low-voltage battery 1.

[0095] In the embodiments of the present disclosure, the preset failure charging voltage can be set according to the characteristics of the low-voltage battery 1, the environment, etc., which can be any reasonable value, for example, when the low-voltage battery 1 is a lead-acid battery, the preset failure charging voltage can be 14.3V, etc., and the present disclosure does not limit this.

[0096] The controller 5 can first judge whether the data detection device 2 fails.

[0097] If it is determined that it does not fail, the above-mentioned "determination of the target charging voltage corresponding to the low-voltage battery 1" and the subsequent steps can be executed, so as to output the power of the target charging voltage to the low-voltage battery 1, thereby charging it.

[0098] If it is determined that a fault occurs, the preset fault power supply voltage can be determined as the target power supply voltage, and the above-mentioned "sending the target power supply voltage to the DCDC converter 4" and subsequent steps are performed, so as to output the power energy of the preset fault power supply voltage for the low-voltage battery 1, and perform constant voltage power supply of the preset fault power supply voltage for the low-voltage battery 1.

[0099] Through the above method, corresponding processing can be performed according to whether the data detection device 2 fails, so as to ensure stable power supply of the low-voltage battery 1, improve stability and safety of the low-voltage battery 1, improve power supply efficiency of the low-voltage battery 1, and increase service life of the low-voltage battery 1.

[0100] Further, the method for judging whether the data detection device 2 fails can be various, and the following describes several possible judging methods.

[0101] Firstly, the data detection device 2 is further configured to: acquire a current temperature of the low-voltage battery 1, and send the current temperature to the controller 5.

[0102] The controller 5 is further configured to: judge whether the received current temperature is greater than or equal to a preset temperature threshold; if yes, and a duration reaches a first preset duration, it is determined that the data detection device 2 fails.

[0103] In implementation, the data detection device 2 can acquire the current temperature of the low-voltage battery 1 in real time, and of course, if the current state information of the low-voltage battery 1 includes the current temperature, the acquisition can be repeated.

[0104] After the data detection device 2 acquires the current temperature of the low-voltage battery 1, the data detection device 2 can send the current temperature to the controller 5. After the controller 5 receives the current temperature, the controller 5 can compare the current temperature with the preset temperature threshold stored in advance.

[0105] If the current temperature is greater than or equal to the preset temperature threshold, it indicates that the signal sent by the data detection device 2 at this time can be inaccurate, that is, the data detection device 2 can fail. In order to further determine whether the data detection device 2 fails, it can be judged whether the current temperature sent by the data detection device 2 in the first preset duration is greater than or equal to the preset temperature threshold, if yes, it indicates that the signal sent by the data detection device 2 in the first preset duration is inaccurate, and at this time, it can be determined that the data detection device 2 fails.

[0106] In the embodiment of the present disclosure, the preset temperature threshold can be a value that can judge that the sent current temperature is unreasonable, for example, the preset temperature threshold can be 120℃, and the like, and the embodiment of the present disclosure is not limited in this regard.

[0107] The first preset time length can be any reasonable time length, for example, can be 3 seconds, etc., which can be set according to actual needs, and the embodiment of the present disclosure does not make specific limitations.

[0108] The second kind: the data detection device 2 is further used for: obtaining the current residual capacity of the low-voltage battery 1, and sending the current residual capacity to the controller 5.

[0109] The controller 5 is further used for: judging whether the received current residual capacity is less than or equal to a preset residual capacity threshold; if yes, and the duration reaches a second preset time length, it is determined that the data detection device 2 has a fault.

[0110] In implementation, the data detection device 2 can obtain the current residual capacity of the low-voltage battery 1 in real time, of course, if the current state information of the low-voltage battery 1 includes the current residual capacity, it can no longer be repeatedly obtained.

[0111] The data detection device 2 can send the current residual capacity to the controller 5 after obtaining the current residual capacity of the low-voltage battery 1. The controller 5 can compare the current residual capacity with the preset residual capacity threshold stored in advance after receiving the current residual capacity.

[0112] If the current residual capacity is less than or equal to the preset residual capacity threshold, it means that the signal sent by the data detection device 2 at this time can be inaccurate, that is, the data detection device 2 can have a fault. In order to further determine whether the data detection device 2 has a fault, it can be judged whether the current residual capacity sent by the data detection device 2 in the second preset time length is less than or equal to the preset residual capacity threshold, if yes, it means that the signal sent by the data detection device 2 in this second preset time length is inaccurate, at this time, it can be determined that the data detection device 2 has a fault.

[0113] In the embodiment of the present disclosure, the preset residual capacity threshold can be a value that can judge that the sent current residual capacity is unreasonable, for example, the preset residual capacity threshold can be 10%, etc., and the embodiment of the present disclosure does not make specific limitations.

[0114] The second preset time length can be any reasonable time length, for example, can be 3 seconds, etc., which can be set according to actual needs, and the embodiment of the present disclosure does not make specific limitations.

[0115] The third kind: the data detection device 2 is further used for: obtaining the current output voltage of the low-voltage battery 1, and sending the current output voltage to the controller 5.

[0116] The controller 5 is further used for: judging whether the received current output voltage is located in a preset voltage range; if no, and the duration reaches a third preset time length, it is determined that the data detection device 2 has a fault.

[0117] In the implementation, the data detection apparatus 2 can acquire the current output voltage of the low-voltage battery 1 in real time. Of course, if the current state information of the low-voltage battery 1 includes the current output voltage, the acquisition can not be repeated.

[0118] After acquiring the current output voltage of the low-voltage battery 1, the data detection apparatus 2 can send the current output voltage to the controller 5. After receiving the current output voltage, the controller 5 can compare the current output voltage with the preset voltage range stored in advance.

[0119] If the current output voltage is outside the preset voltage range, it means that the signal sent by the data detection apparatus 2 at this time can be inaccurate, that is, the data detection apparatus 2 can be faulty. In order to further determine whether the data detection apparatus 2 is faulty, it can be judged whether the current output voltage sent by the data detection apparatus 2 in the third preset time period is outside the preset voltage range. If so, it means that the signals sent by the data detection apparatus 2 in the third preset time period are all inaccurate, and at this time, it can be determined that the data detection apparatus 2 is faulty.

[0120] In the embodiment of the present disclosure, the preset voltage range can be a value range in which the current output voltage sent can be judged to be unreasonable, for example, the preset voltage range can be 4V-17V, etc., and the embodiment of the present disclosure is not limited to this.

[0121] The third preset time period can be any reasonable time period, for example, it can be 3 seconds, etc., and it can be set according to actual needs, and the embodiment of the present disclosure is not limited to this.

[0122] It can be understood that the three judgment methods described above are only some of the enumerated methods, and the judgment method can be any of the above methods, or can be a combination of any of the above methods. When the combination of multiple judgment methods is used, as long as the condition for determining that the data detection apparatus 2 is faulty in one of the judgment methods is met, it can be determined that the data detection apparatus 2 is faulty.

[0123] Of course, the judgment method can include other any reasonable method in addition to the above three methods, and the embodiment of the present disclosure is not limited to this.

[0124] In another possible implementation, whether the controller 5 has a signal loss fault can be monitored, and the method can be as follows:

[0125] The DCDC converter 4 can also be configured to determine whether the controller 5 has a signal loss fault corresponding to the target power compensation voltage, and if so, continue to compensate the low-voltage battery 1 with the target power compensation voltage currently output, and if not, perform the step of regulating the output voltage of the high-voltage battery 3 to the received target power compensation voltage and outputting the target power compensation voltage to compensate the low-voltage battery 1.

[0126] In implementation, the DCDC converter 4 can first determine whether the controller 5 has a signal loss fault.

[0127] If it is determined that the signal loss fault has occurred, the DCDC converter 4 can continue to compensate the low-voltage battery 1 with the target power compensation voltage determined last time as the output voltage.

[0128] If it is determined that the signal loss fault has not occurred, it means that the DCDC converter 4 can normally receive the target power compensation voltage sent by the controller 5, and then the above-mentioned step of regulating the output voltage of the high-voltage battery 3 to the received target power compensation voltage and outputting the target power compensation voltage to compensate the low-voltage battery 1 can be performed, so as to output the target power compensation voltage to the low-voltage battery 1 and compensate it.

[0129] Through the above method, corresponding processing can be performed according to whether the controller 5 has a signal loss fault, so as to ensure stable compensation of the low-voltage battery 1, improve the stability and safety of the low-voltage battery 1, improve the compensation efficiency of the low-voltage battery 1, and increase the service life of the low-voltage battery 1.

[0130] Further, there can be various methods for determining whether the controller 5 has a signal loss fault, and some possible determination methods are introduced as follows.

[0131] In one possible implementation, the DCDC converter 4 can also be configured to determine whether the target power compensation voltage has not been received, and if so, determine that the controller 5 has a signal loss fault.

[0132] In implementation, when the DCDC converter 4 does not receive the target power compensation voltage sent by the controller 5, it is determined that the controller 5 has a signal loss fault.

[0133] In another possible implementation, the DCDC converter 4 can also be configured to determine whether the target power compensation voltage has not been received, and if so, and the duration reaches a fourth preset duration, determine that the controller 5 has a signal loss fault.

[0134] In implementation, when the DCDC converter 4 does not receive the target power compensation voltage sent by the controller 5 within the fourth preset duration, it is determined that the controller 5 has a signal loss fault.

[0135] The fourth preset time length can be any reasonable time length, for example, can be 300 milliseconds, etc., which can be set according to actual needs, and the embodiments of the present disclosure are not limited.

[0136] It can be understood that the two judgment methods described above are only some of the enumerated methods, and the judgment method can be any reasonable method other than the two methods described above, and the embodiments of the present disclosure are not limited.

[0137] The embodiments of the present disclosure also provide a vehicle, which can include the low-voltage battery power supplement system described in any of the above.

[0138] The technical solutions provided by the present disclosure have at least the following beneficial effects:

[0139] The present disclosure provides a low-voltage battery power supplement system, in which the controller determines a target power supplement voltage suitable for the current state of the low-voltage battery 1 based on the current state information of the low-voltage battery 1, and the DCDC converter 4 supplements power to the low-voltage battery 1 with the target power supplement voltage as the output voltage. In this way, the power supplement voltage of the low-voltage battery 1 is adjusted in real time, so that the low-voltage battery 1 is always supplemented with power at a target power supplement voltage suitable for its current state, thereby improving the power supplement efficiency of the low-voltage battery 1 and increasing the service life of the low-voltage battery 1.

[0140] The above is only an optional embodiment of the present disclosure, and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A low-voltage battery charging system, characterized in that: The system comprises a low-voltage battery (1), a data detection device (2), a high-voltage battery (3), a DCDC converter (4) and a controller (5); The data detection device (2) is used to obtain current status information of the low-voltage battery (1) and send the current status information to the controller (5); The controller (5) is used to determine a target charging voltage corresponding to the low-voltage battery (1) based on a correspondence between pre-stored state information and the charging voltage, and the current state information, and send the target charging voltage to the DCDC converter (4); The DCDC converter (4) is used to adjust the output voltage of the high-voltage battery (3) to a received target charging voltage, and output the target charging voltage to charge the low-voltage battery (1).

2. The low-voltage battery charging system according to claim 1, characterized in that: The current state information includes at least one of a current temperature and a current remaining power.

3. The low-voltage battery charging system according to claim 1, characterized in that: The controller (5) is further configured to: Determining whether the data detection device (2) fails; If no fault occurs, determining the target charging voltage corresponding to the low-voltage battery (1) is executed; If a fault occurs, a preset fault compensation voltage is determined as the target compensation voltage, and the target compensation voltage is sent to the DCDC converter (4).

4. The low-voltage battery charging system according to claim 3, characterized in that: The data detection device (2) is further used for: Acquiring the current temperature of the low-voltage battery (1) and sending the current temperature to the controller (5); The controller (5) is further configured to: Determining whether the received current temperature is greater than or equal to a preset temperature threshold; If so, and the duration reaches a first preset duration, it is determined that the data detection device (2) has failed.

5. The low-voltage battery charging system according to claim 3, characterized in that: The data detection device (2) is further used for: Acquiring the current remaining power of the low-voltage battery (1), and sending the current remaining power to the controller (5); The controller (5) is further configured to: Determining whether the received current remaining power is less than or equal to a preset remaining power threshold; If so, and the duration reaches a second preset duration, it is determined that the data detection device (2) has failed.

6. The low-voltage battery charging system according to claim 3, characterized in that: The data detection device (2) is further used for: Obtaining the current output voltage of the low-voltage battery (1), and sending the current output voltage to the controller (5); The controller (5) is further configured to: Determining whether the received current output voltage is within a preset voltage range; If not, and the duration reaches a third preset duration, it is determined that the data detection device (2) has failed.

7. The low-voltage battery charging system according to claim 1, characterized in that: The DCDC converter (4) is also used for: Determining whether a signal loss fault corresponding to a target power-up voltage occurs in the controller (5); If so, continue to recharge the low-voltage battery (1) at the currently output target recharge voltage; If not, the output voltage of the high-voltage battery (3) is adjusted to the received target charging voltage, and the target charging voltage is output to charge the low-voltage battery (1).

8. The low-voltage battery charging system according to claim 7, characterized in that: The DCDC converter (4) is also used for: Determining whether the target power supply voltage is not received and the duration reaches a fourth preset duration; If so, it is determined that the controller (5) has the signal loss fault.

9. The low-voltage battery charging system according to claim 1, characterized in that: The data detection device (2) is further used for: Obtaining the current output voltage of the low-voltage battery (1), and sending the current output voltage to the controller (5); The controller (5) is further configured to: After determining the target charging voltage corresponding to the low-voltage battery (1), judging whether the current output voltage reaches the target charging voltage; If so, it is determined that the low-voltage battery (1) does not need to be recharged; If not, the target compensation voltage is sent to the DCDC converter (4).

10. A vehicle, characterized in that: The vehicle includes a low-voltage battery charging system according to any one of claims 1 to 9.

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