Recharging system for low voltage battery and vehicle

Abstract

The disclosure provides a power supplement 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 to obtain current state information of the low-voltage battery and send the current state information to the controller. The controller is used to determine a target power supplement voltage corresponding to the low-voltage battery based on a correspondence between pre-stored state information and power supplement voltages and the current state information, and send the target power supplement voltage to the DCDC converter. The DCDC converter is used to regulate the output voltage of the high-voltage battery to the received target power supplement voltage, and output the target power supplement voltage to supplement power for the low-voltage battery. By using the disclosure, the power supplement efficiency of the low-voltage battery is improved, and the service life of the low-voltage battery is increased.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle technology, specifically to a low-voltage battery charging system and a vehicle. Background Technology

[0002] Low-voltage batteries are important power supply devices for low-voltage loads in vehicles. When the low-voltage battery is low on power, the high-voltage battery in the vehicle will replenish its power through a DC-DC (direct current-to-direct current) converter.

[0003] The current method of replenishing power is to use a DC-DC converter to step down the high voltage of the high-voltage battery to a fixed voltage value and then output that fixed voltage value to replenish the low-voltage battery.

[0004] While the above-mentioned charging methods can replenish low-voltage batteries, they are too crude, resulting in low charging efficiency and shortening the battery's lifespan. Summary of the Invention

[0005] This disclosure provides a low-voltage battery charging system and vehicle, which can solve the technical problems existing in related technologies. The technical solution is as follows:

[0006] On the one hand, this disclosure provides a low-voltage battery charging system, the system including a low-voltage battery, a data detection device, a high-voltage battery, a DC-DC converter, and a controller;

[0007] The data detection device is used to acquire the current status information of the low-voltage battery and send the current status information to the controller;

[0008] The controller is used to determine the target replenishment voltage corresponding to the low-voltage battery based on the correspondence between pre-stored state information and replenishment voltage, as well as the current state information, and to send the target replenishment voltage to the DC-DC converter;

[0009] The DC-DC converter is used to adjust the output voltage of the high-voltage battery to the received target replenishment voltage, and output the target replenishment voltage to replenish the low-voltage battery.

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

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

[0012] Determine whether the data detection device has malfunctioned;

[0013] If no fault occurs, proceed to determine the target replenishment voltage corresponding to the low-voltage battery;

[0014] If a fault occurs, the preset fault compensation voltage is determined as the target compensation voltage, and the process of sending the target compensation voltage to the DC-DC converter is executed.

[0015] In one possible implementation, the data detection device is further used for:

[0016] The current temperature of the low-voltage battery is obtained and sent to the controller;

[0017] The controller is also used for:

[0018] Determine whether the received current temperature is greater than or equal to a preset temperature threshold;

[0019] If so, and the duration reaches the first preset duration, then it is determined that the data detection device has malfunctioned.

[0020] In one possible implementation, the data detection device is further used for:

[0021] Obtain the current remaining power of the low-voltage battery and send the current remaining power to the controller;

[0022] The controller is also used for:

[0023] Determine whether the received current remaining battery power is less than or equal to a preset remaining battery power threshold;

[0024] If so, and the duration reaches the second preset duration, then it is determined that the data detection device has malfunctioned.

[0025] In one possible implementation, the data detection device is further used for:

[0026] Obtain the current output voltage of the low-voltage battery and send the current output voltage to the controller;

[0027] The controller is also used for:

[0028] Determine whether the received current output voltage is within a preset voltage range;

[0029] If not, and the duration reaches the third preset duration, then it is determined that the data detection device has malfunctioned.

[0030] In one possible implementation, the DC-DC converter is also used for:

[0031] Determine whether the controller has experienced a signal loss fault corresponding to the target replenishment voltage;

[0032] If so, continue to charge the low-voltage battery using the current output target charging voltage;

[0033] If not, then the process of adjusting the output voltage of the high-voltage battery to the received target replenishment voltage and outputting the target replenishment voltage to replenish the low-voltage battery is performed.

[0034] In one possible implementation, the DC-DC converter is also used for:

[0035] Determine whether the target replenishment voltage has not been received and whether the duration has reached the fourth preset duration;

[0036] If so, then it is determined that the controller has experienced the signal loss fault.

[0037] In one possible implementation, the data detection device is further used for:

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

[0039] The controller is also used for:

[0040] After determining the target replenishment voltage corresponding to the low-voltage battery, it is determined whether the current output voltage reaches the target replenishment voltage;

[0041] If so, then it is determined that the low-voltage battery does not require recharging;

[0042] If not, then the process of sending the target supplemental voltage to the DC-DC converter is performed.

[0043] On the other hand, this disclosure also provides a vehicle that includes a low-voltage battery charging system as described in any of the preceding claims.

[0044] The technical solution provided in this disclosure includes at least the following beneficial effects:

[0045] This disclosure provides a low-voltage battery charging system. In the low-voltage battery charging system, the controller determines a target charging voltage suitable for the current state of the low-voltage battery based on the current state information of the low-voltage battery. The DC-DC converter then uses this target charging voltage as its output voltage to charge the low-voltage battery. In this way, the charging voltage of the low-voltage battery is adjusted in real time to keep it at a target charging voltage that is more suitable for the current state of the low-voltage battery, thereby improving the charging efficiency of the low-voltage battery and increasing its service life.

[0046] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the structure of a low-voltage battery charging system according to an embodiment of the present disclosure;

[0049] Figure 2 This is a schematic diagram illustrating the working process of a low-voltage battery charging system according to an embodiment of this disclosure.

[0050] Legend

[0051] 1. Low-voltage battery; 2. Data detection device; 3. High-voltage battery; 4. DC-DC converter; 5. Controller. Detailed Implementation

[0052] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” encompasses the element or object listed following “comprising” or “including” and its equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0053] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0054] This disclosure provides a low-voltage battery charging system, see [link to relevant documentation]. Figure 1 and Figure 2 The low-voltage battery charging system includes a low-voltage battery 1, a data detection device 2, a high-voltage battery 3, a DC-DC converter 4, and a controller 5.

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

[0056] The controller 5 is used to determine the target replenishment voltage corresponding to the low-voltage battery 1 based on the correspondence between the pre-stored state information and the replenishment voltage, as well as the current state information, and sends the target replenishment voltage to the DC-DC converter 4.

[0057] The DC-DC converter 4 is used to adjust the output voltage of the high-voltage battery 3 to the received target replenishment voltage, and output the target replenishment voltage to replenish the low-voltage battery 1.

[0058] In practice, the data detection device 2 can acquire the current status information of the low-voltage battery 1 in real time. This current status information can be the current status of various parameters of the low-voltage battery 1. After acquiring the current status information, the data detection device 2 will send the current status information to the controller 5.

[0059] The controller 5 stores the correspondence between state information and replenishment voltage in advance. In this relationship, different state information corresponds to a replenishment voltage. The replenishment voltage corresponding to the state information is the optimal replenishment voltage when the state of the low-voltage battery 1 is that state information. Using the replenishment voltage to replenish the low-voltage battery 1 at that state information can ensure high replenishment efficiency and minimize the adverse impact 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 status information of the low-voltage battery 1 sent by the data detection device 2, the controller 5 can determine the target replenishment voltage corresponding to the current status information of the low-voltage battery 1 based on the correspondence between the pre-stored status information and the replenishment voltage. The target replenishment voltage is the optimal replenishment voltage corresponding to the current status information.

[0061] Then, the controller 5 can send the determined target replenishment voltage to the DC-DC converter 4. After receiving the target replenishment voltage, the DC-DC converter 4 can step down the high voltage supplied by the high voltage battery 3 to the target replenishment voltage and replenish the low voltage battery 1.

[0062] In this way, in the low-voltage battery charging system, 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. The DC-DC converter 4 then uses this target charging voltage as the output voltage to charge the low-voltage battery 1. In this way, the charging voltage of the low-voltage battery 1 is adjusted in real time to keep it at a target charging 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 its service life.

[0063] In this embodiment of the disclosure, the data detection device 2 can be any reasonable detection device, such as a sensor module in the EBS (Electronic Brake System) of a vehicle, etc. This embodiment of the disclosure does not limit it.

[0064] The controller 5 can be any reasonable control device, such as an HCU (Hybrid Control Unit) or a zone controller in a vehicle, etc. This disclosure does not limit it.

[0065] There are multiple ways for the data detection device 2 to send the current status information to the controller 5. For example, the data detection device 2 can directly send the current status information to the controller 5. Or, the data detection device 2 can forward the current status information to the controller 5 through other devices. These other devices can be any reasonable devices, such as BDM (Body Control Module), etc. This embodiment does not limit the scope of the invention.

[0066] In this embodiment, the correspondence between the pre-stored state information and the replenishment voltage of the controller 5 can be varied. For example, the replenishment voltage can have a linear correspondence with the state information, or it can have a non-linear relationship, which can be set according to the experimental conditions and the actual needs of the low-voltage battery 1.

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

[0068] In one possible implementation, the current status information may include at least one of the current temperature and the current remaining battery power. Correspondingly, the status information also includes at least one of the current temperature and the current remaining battery power.

[0069] In this embodiment of the disclosure, the correspondence between the status information and the compensation voltage can also be of several possibilities. Several of these possible correspondences are described below:

[0070] In one possible implementation, the current state information may include the current temperature. Correspondingly, if the state information includes temperature, the relationship between the supplementary voltage and the temperature may be: the supplementary voltage decreases as the temperature increases.

[0071] In another possible implementation, the current status information may include the current remaining power. Correspondingly, if the status information includes the remaining power, the relationship between the replenishment voltage and the remaining power may be as follows: when the remaining power is less than a first preset power value, the replenishment voltage remains unchanged; when the remaining power is greater than the first preset power value and less than a second preset power value, the replenishment voltage increases as the remaining power increases; when the remaining power is greater than the second preset power value, the replenishment voltage decreases as the remaining power increases.

[0072] In another possible implementation, the current status information may include the current temperature and the current remaining power. Correspondingly, if the status information includes temperature and remaining power, then the correspondence between the replenishment voltage and the temperature and remaining power can be:

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

[0074] Where V is the replenishment voltage, SOC is the remaining charge, and T is the temperature.

[0075] Based on the above correspondence, it can be seen that the influence of temperature on the replenishment voltage increases with the increase of the remaining power. When the remaining power is high, the replenishment voltage will show a downward trend, and the replenishment voltage is close to 15V when the temperature is low and the power is low.

[0076] Experiments have shown that by using the above correspondence, the target charging voltage that is more in line with the current state of the low-voltage battery 1 can be used to charge the low-voltage battery 1, thereby improving the charging efficiency of the low-voltage battery 1 and increasing its service life.

[0077] Of course, in this embodiment of the disclosure, the correspondence between the above-mentioned status information and the supplementary voltage is only one of the possible correspondences listed. The correspondence can also be any other reasonable setting, and this embodiment of the disclosure does not specifically limit it.

[0078] In this embodiment, before recharging the low-voltage battery 1, it can be determined whether the low-voltage battery 1 needs recharging. There are several methods for this determination, and some of them are described below:

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

[0080] The controller 5 can also be used 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 so, it is determined that the low-voltage battery 1 needs to be recharged, and the above-mentioned step of "determining the target recharge voltage corresponding to the low-voltage battery 1" can be executed, and then the DC-DC converter 4 will recharge the low-voltage battery 1 based on the target recharge voltage; if not, it is determined that the low-voltage battery 1 does not need to be recharged, and the steps of "determining the target recharge voltage corresponding to the low-voltage battery 1" and its subsequent steps can be skipped.

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

[0082] The data detection device 2 is also used 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 used to: after determining the target replenishment voltage corresponding to the low-voltage battery 1, determine whether the current output voltage reaches the target replenishment voltage; if yes, determine that the low-voltage battery 1 does not need to be replenished; if no, execute the sending of the target replenishment voltage to the DC-DC converter 4.

[0084] In practice, in addition to acquiring the current status information of the low-voltage battery 1, the data detection device 2 can also acquire the current output voltage of the low-voltage battery 1, that is, the output voltage of the low-voltage battery 1 when it 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 replenishment voltage of the low-voltage battery 1 based on the corresponding relationship, the controller 5 can determine whether the current output voltage has reached the target replenishment voltage. This target replenishment voltage is both the replenishment voltage that is more suitable for the current state of the low-voltage battery 1, as mentioned above, and the output voltage that is more suitable for the current state of the low-voltage battery 1.

[0086] Therefore, if the current output voltage of low-voltage battery 1 does not reach the target replenishment voltage, it means that low-voltage battery 1 needs to be replenished. At this time, the above-mentioned steps of "sending the target replenishment voltage to DC-DC converter 4" and subsequent steps can be performed to replenish low-voltage battery 1.

[0087] If the current output voltage of low-voltage battery 1 reaches the target replenishment voltage, it means that the remaining power in low-voltage battery 1 is sufficient and there is no need for replenishment. Therefore, the subsequent steps of "sending the target replenishment voltage to DC-DC converter 4" and subsequent steps will not be performed.

[0088] Furthermore, the controller 5 can also pre-store a fifth preset duration.

[0089] When determining whether low-voltage battery 1 needs recharging, it can be determined whether the current output voltage is significantly higher than the target recharging voltage. If it is not, and the duration reaches the fifth preset duration (i.e., the current output voltage received within the fifth preset duration does not reach the target recharging voltage), then low-voltage battery 1 needs recharging. If it is not, but the duration also does not reach the fifth preset duration, then low-voltage battery 1 does not need recharging. If it is, then low-voltage battery 1 also does not need recharging.

[0090] Of course, in the embodiments of this disclosure, the above-mentioned judgment methods are only a few possible methods for judging whether the low-voltage battery 1 needs to be recharged. They can also be any other reasonable methods, and the embodiments of this disclosure do not specifically limit them.

[0091] In this embodiment of the disclosure, the low-voltage battery charging system can also monitor whether a fault occurs in each step. The monitoring method and the corresponding processing method are as follows:

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

[0093] The controller 5 is also used to: determine whether the data detection device 2 has malfunctioned; if no malfunction has occurred, determine the target replenishment voltage corresponding to the low-voltage battery 1; if a malfunction has occurred, determine the preset malfunction replenishment voltage as the target replenishment voltage, and send the target replenishment voltage to the DC-DC converter 4.

[0094] In implementation, the controller 5 stores a preset fault compensation voltage. This preset fault compensation voltage is a constant voltage value that can show good charging efficiency in various states of the low-voltage battery 1 and has little impact on the service life of the low-voltage battery 1.

[0095] In this embodiment of the disclosure, the preset fault compensation voltage can be set according to the characteristics of the low-voltage battery 1, the environment, etc., and it can be any reasonable value. For example, when the low-voltage battery 1 is a lead-acid battery, the preset fault compensation voltage can be 14.3V, etc. This embodiment of the disclosure does not limit this.

[0096] The controller 5 can first determine whether the data detection device 2 has malfunctioned.

[0097] If it is determined that no fault has occurred, the above-mentioned steps of "determining the target replenishment voltage corresponding to low-voltage battery 1" and subsequent steps can be performed to output electrical energy of the target replenishment voltage to low-voltage battery 1, thereby replenishing its power.

[0098] If a fault is confirmed, the preset fault compensation voltage can be determined as the target compensation voltage, and the above-mentioned steps of "sending the target compensation voltage to the DC-DC converter 4" and subsequent steps can be executed to output the preset fault compensation voltage to the low-voltage battery 1, thereby performing constant voltage compensation of the preset fault compensation voltage to the low-voltage battery 1.

[0099] By using the above method, corresponding processing can be carried out to determine whether the data detection device 2 has malfunctioned, thereby ensuring stable charging of the low-voltage battery 1, improving the stability and safety of the low-voltage battery 1, improving the charging efficiency of the low-voltage battery 1, and increasing the service life of the low-voltage battery 1.

[0100] Furthermore, there are several methods to determine whether the data detection device 2 has malfunctioned. Below, we will introduce some of these possible methods:

[0101] The first type: The data detection device 2 is also used to: obtain the current temperature of the low-voltage battery 1 and send the current temperature to the controller 5.

[0102] The controller 5 is also used to: determine 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, then determine that the data detection device 2 has malfunctioned.

[0103] In practice, the data detection device 2 can acquire the current temperature of the low-voltage battery 1 in real time. Of course, if the current status information of the low-voltage battery 1 includes the current temperature, it is not necessary to acquire it again.

[0104] After acquiring the current temperature of the low-voltage battery 1, the data detection device 2 can send the current temperature to the controller 5. After receiving the current temperature, the controller 5 can compare the current temperature with a pre-stored preset temperature threshold.

[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 may be inaccurate, meaning that the data detection device 2 may be malfunctioning. To further determine whether the data detection device 2 has malfunctioned, it can be determined whether the current temperature sent by the data detection device 2 within the first preset time period is greater than or equal to the preset temperature threshold. If so, it indicates that the signals sent by the data detection device 2 within this first preset time period are all inaccurate, and at this point, it can be determined that the data detection device 2 has malfunctioned.

[0106] In this embodiment of the disclosure, the preset temperature threshold can be a value that can determine that the current temperature sent is unreasonable. For example, the preset temperature threshold can be 120°C, etc. This embodiment of the disclosure does not specifically limit it.

[0107] The first preset duration can be any reasonable duration, such as 3 seconds, etc. It can be set according to actual needs, and this embodiment does not specifically limit it.

[0108] The second type: the data detection device 2 is also used to: obtain the current remaining power of the low-voltage battery 1 and send the current remaining power to the controller 5.

[0109] The controller 5 is also used to: determine 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, then determine that the data detection device 2 has malfunctioned.

[0110] In practice, the data detection device 2 can obtain the current remaining power of the low-voltage battery 1 in real time. Of course, if the current status information of the low-voltage battery 1 includes the current remaining power, it is not necessary to obtain it again.

[0111] After obtaining the current remaining power of the low-voltage battery 1, the data detection device 2 can send the current remaining power to the controller 5. After receiving the current remaining power, the controller 5 can compare the current remaining power with a pre-stored preset remaining power threshold.

[0112] If the current remaining battery power is less than or equal to a preset remaining battery power threshold, it indicates that the signal sent by data detection device 2 may be inaccurate, meaning that data detection device 2 may be malfunctioning. To further determine whether data detection device 2 has malfunctioned, it can be determined whether the current remaining battery power sent by data detection device 2 within a second preset time period is consistently less than or equal to the preset remaining battery power threshold. If so, it indicates that the signals sent by data detection device 2 within this second preset time period are inaccurate, and in this case, it can be determined that data detection device 2 has malfunctioned.

[0113] In this embodiment of the disclosure, the preset remaining power threshold can be a value that can determine whether the current remaining power is unreasonable. For example, the preset remaining power threshold can be 10%, etc. This embodiment of the disclosure does not specifically limit it.

[0114] The second preset duration can be any reasonable duration, such as 3 seconds, etc. It can be set according to actual needs, and this embodiment does not specifically limit it.

[0115] The third type: the data detection device 2 is also used to: acquire the current output voltage of the low-voltage battery 1 and send the current output voltage to the controller 5.

[0116] The controller 5 is also used to: determine whether the received current output voltage is within the preset voltage range; if not, and the duration reaches the third preset duration, then determine that the data detection device 2 has malfunctioned.

[0117] In practice, the data detection device 2 can acquire the current output voltage of the low-voltage battery 1 in real time. Of course, if the current status information of the low-voltage battery 1 includes the current output voltage, it is not necessary to acquire it again.

[0118] After acquiring the current output voltage of the low-voltage battery 1, the data detection device 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 a pre-stored preset voltage range.

[0119] If the current output voltage is outside the preset voltage range, it indicates that the signal sent by the data detection device 2 may be inaccurate, meaning that the data detection device 2 may be malfunctioning. To further determine whether the data detection device 2 has malfunctioned, it can be determined whether the current output voltage sent by the data detection device 2 within the third preset time period is consistently outside the preset voltage range. If so, it indicates that the signals sent by the data detection device 2 within this third preset time period are inaccurate, and in this case, it can be determined that the data detection device 2 has malfunctioned.

[0120] In this embodiment of the disclosure, the preset voltage range can be a numerical range that can determine whether the current output voltage is unreasonable. For example, the preset voltage range can be 4V to 17V, etc. This embodiment of the disclosure does not specifically limit this range.

[0121] The third preset duration can be any reasonable duration, such as 3 seconds, etc. It can be set according to actual needs, and this embodiment does not specifically limit it.

[0122] It is understood that the three judgment methods mentioned above are only a few examples. The judgment method can be any one of the above methods, or it can be a combination of any of the above methods. When multiple judgment methods are combined, as long as the condition of determining that the data detection device 2 has failed is met in one of the judgment methods, it can be determined that the data detection device 2 has failed.

[0123] Of course, the determination method can include any other reasonable method besides the three methods mentioned above, and this disclosure does not limit it.

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

[0125] The DC-DC converter 4 can also be used to: determine whether the controller 5 has experienced a signal loss fault corresponding to the target replenishment voltage; if so, continue to replenish the low-voltage battery 1 with the currently output target replenishment voltage; if not, adjust the output voltage of the high-voltage battery 3 to the received target replenishment voltage, and output the target replenishment voltage to replenish the low-voltage battery 1.

[0126] In practice, the DC-DC converter 4 can first determine whether the controller 5 has experienced a signal loss fault.

[0127] If a signal loss fault is confirmed, the DC-DC converter 4 can continue to use the most recently determined target replenishment voltage as the output voltage to replenish the low-voltage battery 1.

[0128] If it is confirmed that no signal loss fault has occurred, it means that the DC-DC converter 4 can normally receive the target replenishment voltage sent by the controller 5. Then, the above-mentioned steps of "adjusting the output voltage of the high-voltage battery 3 to the received target replenishment voltage and outputting the target replenishment voltage to replenish the low-voltage battery 1" can be executed, thereby outputting the target replenishment voltage of electrical energy to the low-voltage battery 1 to replenish it.

[0129] By using the above methods, corresponding processing can be carried out for whether the controller 5 has a signal loss fault, thereby ensuring stable charging of the low-voltage battery 1, improving the stability and safety of the low-voltage battery 1, improving the charging efficiency of the low-voltage battery 1, and increasing the service life of the low-voltage battery 1.

[0130] Furthermore, there are several methods to determine whether controller 5 has experienced a signal loss fault. Below, we will introduce some of these possible methods:

[0131] In one possible implementation, the DC-DC converter 4 can also be used to: determine whether the target supplementary voltage has not been received; if so, determine that the controller 5 has experienced a signal loss fault.

[0132] In practice, when the DC-DC converter 4 does not receive the target replenishment voltage sent by the controller 5, it is determined that the controller 5 has experienced a signal loss fault.

[0133] In another possible implementation, the DC-DC converter 4 can also be used to: determine whether the target supplementary voltage has not been received; if so, and the duration reaches a fourth preset duration, then determine that the controller 5 has experienced a signal loss fault.

[0134] In practice, if the DC-DC converter 4 does not receive the target replenishment voltage sent by the controller within the fourth preset time period, it can be determined that the controller 5 has experienced a signal loss fault.

[0135] The fourth preset duration can be any reasonable duration, such as 300 milliseconds, etc., and can be set according to actual needs. This embodiment of the disclosure does not limit it.

[0136] It is understood that the two judgment methods mentioned above are only a few examples. In addition to the two methods mentioned above, the judgment method can also be any other reasonable method. This disclosure does not limit the methods.

[0137] This disclosure also provides a vehicle that may include a low-voltage battery charging system as described in any of the above embodiments.

[0138] The technical solution provided in this disclosure includes at least the following beneficial effects:

[0139] This disclosure provides a low-voltage battery charging system. In the low-voltage battery charging system, the controller 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. The DC-DC converter 4 then uses this target charging voltage as the output voltage to charge the low-voltage battery 1. In this way, the charging voltage of the low-voltage battery 1 is adjusted in real time to keep it at a target charging 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.

[0140] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A low-voltage battery charging system, characterized in that, The system includes a low-voltage battery (1), a data detection device (2), a high-voltage battery (3), a DC-DC converter (4), and a controller (5). The data detection device (2) is used to obtain the current status information of the low-voltage battery (1) and send the current status information to the controller (5). The current status information includes the current temperature and the current remaining power. The controller (5) is used to determine the target replenishment voltage corresponding to the low-voltage battery (1) based on the correspondence between the pre-stored state information and the replenishment voltage, as well as the current state information, and send the target replenishment voltage to the DC-DC converter (4). The correspondence between the status information and the compensation voltage is as follows: V=15-2.4 SOC+1.84 SOC 2 -0.016 SOC T Where V is the replenishment voltage, SOC is the remaining charge, and T is the temperature; The DC-DC converter (4) is used to adjust the output voltage of the high-voltage battery (3) to the received target replenishment voltage, and output the target replenishment voltage to replenish the low-voltage battery (1).

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

3. The low-voltage battery charging system according to claim 1, characterized in that, The controller (5) is also used for: Determine whether the data detection device (2) has malfunctioned; If no fault occurs, then proceed to determine the target replenishment voltage corresponding to the low-voltage battery (1); If a fault occurs, the preset fault compensation voltage is determined as the target compensation voltage, and the process of sending the target compensation voltage to the DC-DC converter (4) is executed.

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

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

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

7. The low-voltage battery charging system according to claim 1, characterized in that, The DC-DC converter (4) is also used for: Determine whether the controller (5) has experienced a signal loss fault corresponding to the target replenishment voltage; If so, continue to charge the low-voltage battery (1) with the current output target charging voltage; If not, then the output voltage of the high-voltage battery (3) is adjusted to the received target replenishment voltage, and the target replenishment voltage is output to replenish the low-voltage battery (1).

8. The low-voltage battery charging system according to claim 7, characterized in that, The DC-DC converter (4) is also used for: Determine whether the target replenishment voltage has not been received and whether the duration has reached the fourth preset duration; If so, then it is determined that the controller (5) has experienced the signal loss fault.

9. The low-voltage battery charging system according to claim 1, characterized in that, The data detection device (2) is also used for: Obtain the current output voltage of the low-voltage battery (1) and send the current output voltage to the controller (5); The controller (5) is also used for: After determining the target replenishment voltage corresponding to the low-voltage battery (1), it is determined whether the current output voltage reaches the target replenishment voltage; If so, then it is determined that the low-voltage battery (1) does not need to be recharged; If not, then the process of sending the target supplemental voltage to the DC-DC converter (4) is performed.

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

Images