Low-voltage storage battery power supply system and vehicle

Abstract

The utility model provides a low-voltage storage battery power supply system and a vehicle. The low-voltage storage battery power supply system comprises a storage battery, a control module, a voltage converter, a load module, a first switch and a second switch, the control module is configured to transmit a first electric signal to the control end of the first switch in response to the fact that the charge capacity of the storage battery is lower than a first threshold value so as to close the first switch; a second electric signal is transmitted to the control end of the second switch to turn off the second switch, and a starting signal is transmitted to the voltage converter; and a voltage converter configured to transmit a charging current to the storage battery via the first switch in response to the start-up signal to charge the storage battery. According to the invention, the control module and the voltage converter are utilized to transmit the charging current to the storage battery to charge the storage battery, so that the condition that the capacity of the storage battery is damaged due to frequent power shortage of the storage battery is avoided; meanwhile, the electric quantity output by the voltage converter can be reasonably distributed, so that the extra consumption of the electric quantity is reduced, and the cruising ability of the vehicle is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of new energy vehicles, and specifically, to a low-voltage battery power supply system and a vehicle. Background Art

[0002] With the continuous advancement of technology, the market demand for new energy vehicles continues to grow. The power supply system of new energy vehicles mainly includes high-voltage power supply and low-voltage power supply. The low-voltage power supply is mainly powered by a 12V lead-acid battery, which can output a large current in a short time to meet the power consumption demand of the low-voltage power system.

[0003] However, in the related art, the battery often runs out of power, which not only damages the battery's power storage performance, but also increases the extra consumption of other power sources, resulting in a reduction in the vehicle's endurance. Utility Model Content

[0004] In order to solve the above problems, the present application provides a low-voltage battery power supply system and vehicle. By differentiating the load of the whole vehicle, the battery supplies power to the load module, and based on the charge of the battery, combined with the on-off of the switch control circuit, the battery is charged through a voltage converter, which can not only solve the problem of frequent battery power loss, but also reduce the additional loss of other power sources and increase the vehicle's endurance.

[0005] In a first aspect, the present application provides a low-voltage battery power supply system, comprising:

[0006] The low-voltage battery power supply system comprises:

[0007] A battery, a control module, a voltage converter, a load module, a first switch and a second switch;

[0008] One end of the battery is connected to the first end of the first switch and the first end of the second switch respectively, the second end of the first switch is connected to the voltage converter, and the second end of the second switch is connected to the load module;

[0009] The control module is electrically connected to the battery, the control end of the first switch, the control end of the second switch and the voltage converter respectively, and is configured to transmit a first electrical signal to the control end of the first switch to close the first switch, transmit a second electrical signal to the control end of the second switch to turn off the second switch, and transmit a start signal to the voltage converter in response to the charge of the battery being lower than a first threshold.

[0010] The voltage converter is configured to transmit a charging current to the battery via the first switch in response to the start signal, so as to charge the battery.

[0011] Optionally, the control module is further configured to transmit the second signal to the control end of the first switch to turn off the first switch, transmit the first electrical signal to the control end of the second switch to close the second switch, and transmit a shutdown signal to the voltage converter to prohibit starting of the voltage converter in response to the charge of the battery being higher than a second threshold;

[0012] Wherein, in the case where the voltage converter is prohibited from starting, it is further configured to stop transmitting the charging current on the path between the voltage converter and the battery in response to the shutdown signal;

[0013] The battery is further configured to transmit current to the load module via the second end of the second switch in response to the second switch being closed, so as to supply power to the load module.

[0014] Optionally, the control module includes a battery management unit and a battery detection unit;

[0015] One end of the battery detection unit is connected to one end of the battery, and the other end is connected to the battery management unit;

[0016] The battery management unit is electrically connected to the voltage converter, the control end of the first switch and the control end of the second switch respectively;

[0017] The battery detection unit is configured to transmit a third signal to the battery management unit;

[0018] The battery management unit is configured to transmit the first signal to the control terminal of the first switch to close the first switch, transmit the second signal to the control terminal of the second switch to turn off the second switch, and transmit the start signal to the voltage converter in response to the third signal;

[0019] The battery detection unit is further configured to transmit a fourth signal to the battery management unit;

[0020] The battery management unit is configured to transmit the second signal to the control end of the first switch to turn off the first switch, transmit the first signal to the control end of the second switch to close the second switch, and transmit the shutdown signal to the voltage converter to prohibit the startup of the voltage converter in response to the fourth signal.

[0021] Optionally, the load module includes a first load and a second load, and an operating voltage of the first load is higher than an operating voltage of the second load;

[0022] The first load is connected to the output terminal of the voltage converter;

[0023] One end of the second load is connected to the second end of the second switch, and the other end is connected to the output end of the voltage converter, and the second load is electrically connected to the control module;

[0024] The control module is configured to transmit a first electrical signal to a control terminal of the first switch to close the first switch in response to the charge of the battery being lower than a first threshold; and transmit a second electrical signal to a control terminal of the second switch to turn off the second switch, and transmit a start signal to the voltage converter;

[0025] The voltage converter is configured to transmit the charging current to the battery via the first switch in response to the start signal, so as to charge the battery.

[0026] Optionally, the low-voltage battery power supply system further includes a battery pack;

[0027] One end of the battery pack is connected to the input end of the voltage converter, and the other end is electrically connected to the control module;

[0028] The battery pack is configured to deliver current to the voltage converter and the control module.

[0029] Optionally, the low-voltage battery power supply system further includes a timing module, and the timing module is electrically connected to the control module;

[0030] The control module is further configured to activate the timing module in response to the charge of the battery being lower than the first threshold;

[0031] The timing module is configured to transmit time information to the control module at a first time after being activated, wherein the time information includes the first time;

[0032] The control module is configured to transmit the second signal to the second switch to turn off the second switch in response to the time information;

[0033] The control module is also configured to transmit the start signal to the voltage converter in response to the time information being identical to the time threshold, and transmit the first signal to the control end of the first switch to close the first switch, and the voltage converter transmits the charging current to the battery via the first switch.

[0034] Optionally, the control module is configured to, in response to the time information being less than the time threshold, transmit the shutdown signal to the voltage converter to prohibit starting of the voltage converter, and transmit the second signal to the control terminal of the first switch to turn off the first switch, and transmit the second signal to the control terminal of the second switch to turn off the second switch;

[0035] When the voltage converter is prohibited from starting, the charging current transmitted on the path between the voltage converter and the battery disappears.

[0036] Optionally, an output current flows through a path connecting the control module and the battery;

[0037] The control module is further configured to sample the output current flowing through the path, and in response to the sampled output current being higher than a current threshold, transmit the start signal to the voltage converter, and transmit the second signal to the control terminal of the first switch to turn off the first switch, and transmit the second signal to the control terminal of the second switch to turn off the second switch;

[0038] The battery module is configured to stop transmitting current to the load module through the second end of the second switch in response to the second switch being turned off;

[0039] The voltage converter is configured to deliver current to the load module in response to the start signal, and to stop delivering the charging current to the battery module along the first switch in response to the first switch being turned off.

[0040] Optionally, the control module is configured to transmit the first signal to the control terminal of the first switch to close the first switch in response to the sampled output current being higher than a current threshold and in response to the charge of the battery being lower than a third threshold, so that the voltage converter transmits the charging current to the battery via the first switch;

[0041] The third threshold is smaller than the first threshold and smaller than the second threshold.

[0042] In a second aspect, the present application provides a vehicle, comprising the low-voltage power supply system provided in the first aspect.

[0043] Beneficial effects:

[0044] The present application provides a low-voltage battery power supply system and a vehicle. After the vehicle is powered off, after a control module receives a battery charge signal (i.e., a first threshold), a voltage converter controls a first switch to close to conduct a connection path between the voltage converter and the battery, and transmits a charging current to the battery through the voltage converter to charge the battery, thereby avoiding frequent power outages of the battery, which results in damage to the battery capacity. At the same time, charging the battery is based on the detected charge of the battery, so that the power output by the voltage converter is reasonably distributed, thereby reducing the extra consumption of power from other power sources and improving the vehicle's endurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0046] Figure 1 This is a schematic diagram of the structure of the low-voltage battery power supply system proposed in the embodiment of the present application. Figure 1 ;

[0047] Figure 2 This is a schematic diagram of the structure of the low-voltage battery power supply system proposed in the embodiment of the present application. Figure 2 ;

[0048] Figure 3 This is a schematic diagram of the structure of the low-voltage battery power supply system proposed in the embodiment of the present application. Figure 3 ;

[0049] Figure 4 This is a schematic diagram of the structure of the low-voltage battery power supply system proposed in the embodiment of the present application. Figure 4 ;

[0050] Figure 5 This is a schematic diagram of the structure of the low-voltage battery power supply system proposed in the embodiment of the present application. Figure 5 . DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] In the drawings, the size of the constituent elements, the thickness of the layer or the area may be exaggerated for the sake of clarity. Therefore, any implementation of the present disclosure is not necessarily limited to the size shown in the drawings, and the shapes and sizes of the components in the drawings do not reflect the true proportions. In addition, the drawings schematically show ideal examples, and any implementation of the present disclosure is not limited to the shapes or values ​​shown in the drawings.

[0053] Reference Figure 1 , Figure 1 The structure of a low-voltage battery power supply system proposed in this application is shown Figure 1 ,include:

[0054] A battery, a control module, a voltage converter, a load module, a first switch and a second switch;

[0055] One end of the battery is connected to the first end of the first switch and the first end of the second switch respectively, the second end of the first switch is connected to the voltage converter, and the second end of the second switch is connected to the load module;

[0056] The control module is electrically connected to the battery, the control end of the first switch, the control end of the second switch and the voltage converter respectively, and is configured to transmit a first electrical signal to the control end of the first switch to close the first switch in response to the charge of the battery being lower than a first threshold; and transmit a second electrical signal to the control end of the second switch to turn off the second switch, and transmit a start signal to the voltage converter;

[0057] The voltage converter (hereinafter referred to as a DCDC converter) is configured to transmit a charging current to the battery via the first switch in response to a start signal, so as to charge the battery.

[0058] It should be noted that the battery refers to a 12V lead-acid battery in a vehicle, which is a low-voltage battery and is mainly used to supply power to low-power loads in the vehicle;

[0059] The control module includes the battery sensor (i.e. EBS) and the battery management system (Battery Management System) (BMS) in the vehicle;

[0060] The battery sensor (i.e. EBS) is used to collect information such as the battery status SOC and send it to the battery management system;

[0061] The battery management system is used to detect the voltage U, BMS_SOC and other information in the DCDC converter, and receive the battery status information from the battery sensor;

[0062] In some embodiments, the voltage converter is a DCDC converter;

[0063] A DCDC converter, also known as a DC-DC converter or a DC-DC power converter, is a switching power supply chip whose main function is to convert a direct current (DC) source from one voltage level to another.

[0064] The load module includes high power loads and low power loads in the vehicle;

[0065] High-power loads refer to loads in the vehicle that require a relatively large current and voltage to drive, which will affect the power performance and energy consumption of the vehicle, such as electric motors, air-conditioning motors, etc., which are not specifically limited in the embodiments of the present application;

[0066] Low-power loads refer to electronic equipment and electrical devices in the vehicle that consume relatively less power, such as car lights, car audio, etc., and are not specifically limited in the embodiments of the present application.

[0067] The first switch and the second switch refer to a relay, which is automatically closed or closed by receiving a signal transmitted by the control module.

[0068] The first threshold refers to the minimum charge value of the battery in the mode requiring immediate power replenishment.

[0069] The first signal refers to an electrical signal indicating that the first switch is closed.

[0070] It should be noted that one end of the battery is connected to the first end of the first switch and the first end of the second switch through a power line, the second end of the first switch is connected to the DCDC converter through the power line, and the second end of the second switch is connected to the load module through the power line;

[0071] The control module is electrically connected to the battery, the control end of the first switch, the control end of the second switch and the DCDC converter through a signal line.

[0072] By setting the above structure, after the vehicle is powered off, the battery transmits current to the load module via the first switch and the path where the first switch is located, so as to maintain the continued operation of part of the load after the vehicle is powered off; the control module is then used to detect the charge of the battery, and when it is detected that the charge of the battery is lower than the first threshold, the first switch is controlled to be closed and the DCDC converter is started, and the DCDC converter transmits charging current to the battery via the first switch and the connection path where the first switch is located, so as to charge the battery, avoid the situation where the battery is often depleted, and reduce the damage to the storage performance of the battery; and the power output of the DCDC converter is reasonably distributed, the additional loss of power of other power sources is reduced, and the endurance of the vehicle is improved.

[0073] In some embodiments, see Figure 1The control module is further configured to transmit a second signal to the control terminal of the first switch to turn off the first switch, transmit a first electrical signal to the control terminal of the second switch to close the second switch, and transmit a shutdown signal to the DCDC converter to prohibit the start-up of the DCDC converter in response to the charge of the battery being higher than a second threshold value;

[0074] Wherein, in the case where the DCDC converter is prohibited from starting, it is further configured to stop transmitting the charging current on the path between the DCDC converter and the battery in response to the shutdown signal;

[0075] The storage battery is further configured to transmit current to the load module via the second end of the second switch in response to the second switch being closed, so as to supply power to the load module.

[0076] It should be noted that the second threshold refers to the maximum charge of the battery under charging condition, which means that the battery does not need to be charged any more;

[0077] The second signal is an electrical signal indicating that the first switch is turned off.

[0078] By setting the above structure, the control module responds to the battery charge being higher than the second threshold value when the DCDC converter is charging the battery and supplying power to the load module. At this time, the first switch is turned off and the DCDC converter is prohibited from starting, that is, the current output by the DCDC converter is prohibited from continuing to transmit the charging current to the battery along the first switch and the connection path where the first switch is located, and the power output by the DCDC converter is stopped from being consumed, which is conducive to saving the power of other power sources; at the same time, the battery continues to supply power to the load module via the second end of the second switch and the path where the second switch is located to maintain the normal operation of the load.

[0079] In some embodiments, see Figure 2 , the control module includes a battery management unit and a battery detection unit;

[0080] One end of the battery detection unit is connected to one end of the battery, and the other end is connected to the battery management unit;

[0081] The battery management unit is electrically connected to the DCDC converter, the control end of the first switch and the control end of the second switch respectively;

[0082] a battery detection unit, configured to transmit a third signal to the battery management unit;

[0083] a battery management unit configured to transmit a first signal to a control terminal of a first switch to close the first switch, transmit a second signal to a control terminal of a second switch to turn off the second switch, and transmit a start signal to a DCDC converter in response to a third signal;

[0084] The battery detection unit is further configured to transmit a fourth signal to the battery management unit;

[0085] The battery management unit is configured to transmit a second signal to the control end of the first switch to turn off the first switch, transmit a first signal to the control end of the second switch to close the second switch, and transmit a shutdown signal to the DCDC converter to prohibit the start-up of the DCDC converter in response to the fourth signal.

[0086] It should be noted that the third signal means that the collected battery charge is the first threshold;

[0087] The fourth signal means that the collected charge of the battery is a second threshold value;

[0088] The battery management unit refers to the battery management system in the vehicle, and the battery detection unit refers to the battery sensor in the vehicle;

[0089] Among them, the battery detection unit is connected to the battery through a power line and to the battery management unit through a signal line; the battery management unit is connected to the control end of the first switch, to the battery detection unit, and electrically connected to the DCDC converter and the second switch through the signal line.

[0090] By setting the above structure, after the vehicle is powered off, the battery supplies power to the load module. At this time, the battery detection unit is used to collect the battery charge information and send the charge information to the battery management unit. The battery management unit determines whether to charge the battery based on the charge information, thereby accurately determining the battery charge state and enabling the battery to have a delayed charging function.

[0091] In some embodiments, see Figure 3 , the load module includes a first load and a second load, and the working voltage of the first load is higher than the working voltage of the second load;

[0092] The first load is connected to the output terminal of the DCDC converter;

[0093] One end of the second load is connected to the second end of the second switch, and the other end is connected to the output end of the DCDC converter, and the second load is electrically connected to the control module;

[0094] a control module, configured to determine whether the second load continues to be executed in response to the battery charge being lower than a first threshold;

[0095] When the control module determines that the second load continues to execute, the first electrical signal is transmitted to the control end of the first switch to close the first switch; and the second electrical signal is transmitted to the control end of the second switch to turn off the second switch, and a start signal is transmitted to the DCDC converter;

[0096] The DCDC converter is configured to transmit a charging current to the battery via the first switch in response to a start signal, so as to charge the battery.

[0097] It should be noted that the first load refers to a high-power load in the vehicle, and the second load refers to a low-power load in the vehicle.

[0098] It should be noted that the first load is connected to the DCDC converter through a power line, the second load is connected to the DCD converter through the power line, and the second load is connected to the second end of the second switch through the power line.

[0099] After the vehicle is powered off, the battery first transmits current to the second load along the second end of the second switch and the path where the second switch is located. In response to the battery charge being lower than the first threshold, the control module executes the above-mentioned step of transmitting charging current to the battery to charge the battery.

[0100] In some embodiments, see Figure 4 , the low-voltage battery power supply system also includes a battery pack;

[0101] One end of the battery pack is connected to the input end of the DCDC converter, and the other end is electrically connected to the control module;

[0102] The battery pack is configured to deliver current to the DCDC converter and the control module.

[0103] It should be noted that the battery pack refers to the high-voltage battery pack in the vehicle, and the battery pack is connected to the DCDC converter through a power line;

[0104] The battery pack transmits high-voltage current to the DCDC converter via the connection path between the battery pack and the DCDC converter. The DCDC converter converts the input high-voltage current into low-voltage current output and transmits it to the battery and load module respectively.

[0105] It should be noted that after the vehicle is powered off, some functions of the vehicle still need to be maintained, and these functions are mainly low-power functions. At this time, the second switch is closed, and the battery transmits current to the load module through the second switch to maintain the normal operation of the load module. At this time, the battery pack is not needed for power supply;

[0106] When the path between the DCDC converter and the battery is turned on, the battery pack supplies power to the DCDC converter so that the DCDC converter charges the battery.

[0107] In some embodiments, see Figure 5 , the low-voltage battery power supply system also includes a timing module, and the timing module is electrically connected to the control module;

[0108] In the case where the control module determines that the load module is prohibited from executing, the control module is further configured to activate the timing module in response to the charge of the battery being lower than the first threshold;

[0109] The timing module is configured to transmit time information to the control module at a first time after being activated, wherein the time information includes a first time;

[0110] a control module configured to transmit a second signal to the second switch to turn off the second switch in response to the time information;

[0111] The control module is further configured to transmit a start signal to the DCDC converter in response to the time information being identical to the time threshold, and transmit a first signal to the control end of the first switch to close the first switch, and the DCDC converter transmits a charging current to the battery via the first switch.

[0112] It should be noted that the timing module refers to a timer installed on the control module, specifically a timer installed on the battery management unit;

[0113] Activating the timing module means that the timing module starts to collect the time when the battery transmits current to the load module along the second switch and the path where the second switch is located.

[0114] The time information refers to the time collected by the timing module for the battery to transmit current to the load module along the second switch and the path where the second switch is located;

[0115] The first time refers to the time value collected by the timing module;

[0116] The time threshold refers to the limited time for the battery to supply power to the load module when the charge of the battery is lower than the first threshold.

[0117] By setting the above structure, according to the charge state of the battery, combined with the on and off of the first switch and the second switch control circuit, when the charge of the battery is at the first threshold, the control module determines not to recharge the battery, and waits until the battery power supply time reaches the time threshold, and then recharges the battery. The battery in this power supply mode has the function of delayed recharging, which can reduce the extra consumption of the battery pack while avoiding battery depletion, thereby improving the vehicle's endurance.

[0118] In some embodiments, see Figure 5 , a control module, configured to transmit a shutdown signal to the DCDC converter to prohibit starting of the DCDC converter in response to the time information being less than a time threshold, and transmit a second signal to the control terminal of the first switch to turn off the first switch, and transmit a second signal to the control terminal of the second switch to turn off the second switch;

[0119] When the DCDC converter is prohibited from starting, the charging current transmitted on the path between the DCDC converter and the battery disappears.

[0120] It should be noted that the above control module includes a battery management unit and a battery detection unit;

[0121] The battery management unit is configured to respond to the time information being less than a time threshold.

[0122] Since the time information does not meet the time threshold, it indicates that the vehicle power mode has changed, and the timing ends. When the function being executed is that the battery power drops to the first threshold and there is no need to recharge immediately, the user can wait for the user to charge the battery during normal use of the vehicle, which can reduce the extra consumption of the high-voltage battery pack and improve the vehicle's endurance.

[0123] In some embodiments, see Figure 5 , an output current flows through the path connecting the control module and the battery;

[0124] The control module is further configured to sample the output current flowing through the path, and in response to the sampled output current being higher than the current threshold, transmit a start signal to the DCDC converter, and transmit a second signal to the control terminal of the first switch to turn off the first switch, and transmit a second signal to the control terminal of the second switch to turn off the second switch;

[0125] The battery module is configured to stop transmitting current to the load module through the second end of the second switch in response to the second switch being turned off;

[0126] The DCDC converter is configured to deliver current to the load module in response to the start signal, and to stop delivering charging current to the battery module along the first switch in response to the first switch being turned off.

[0127] It should be noted that the output current refers to the battery current delivered to the load module along the second switch and the connection path where the second switch is located;

[0128] The current threshold refers to the maximum current value that the battery can output.

[0129] It should be noted that the above control module includes a battery management unit and a battery detection unit;

[0130] The battery detection unit is configured to sample the output current flowing through the path, and the battery management unit responds when the sampled output current is higher than a current threshold.

[0131] It should be noted that when the first load is running, the power supply mode in which the output current is higher than the current threshold is also executed.

[0132] By setting the above structure, when the current value output by the battery is higher than the current threshold, it means that there are too many low-power loads or high-power loads running in the load module. In order to avoid the situation where the battery is running low after continuous output, the second switch is controlled to be turned off through the DCDC converter to block the second switch and the connection path where the second switch is located from continuing to transmit current.

[0133] In some embodiments, see Figure 5 , a control module, configured to transmit a first signal to a control terminal of a first switch to close the first switch in response to the sampled output current being higher than a current threshold and in response to the charge of the battery being lower than a third threshold, so that the DCDC converter transmits a charging current to the battery via the first switch;

[0134] The third threshold is smaller than the first threshold, and smaller than the second threshold.

[0135] It should be noted that the above control module includes a battery management unit and a battery detection unit;

[0136] wherein the battery management unit responds to the battery charge being lower than a third threshold;

[0137] The third threshold value refers to the minimum charge value of the battery in a mode where no immediate charging is required.

[0138] By adopting the above structure, when the charge of the battery is lower than the third threshold, the DCDC converter transmits charging current to the battery via the first end of the first switch and the path where the first switch is located to replenish the battery and prevent the battery from being in a power-deficient state for a long time.

[0139] In some embodiments, see Figure 5 The control module is also configured to transmit a second signal to the control end of the first switch to turn off the first switch in response to the charge of the battery being higher than a second threshold, thereby prohibiting the DCDC converter from continuing to charge the battery.

[0140] When the charge of the battery is higher than the second threshold, it means that the battery does not need to be charged any more, and the DCDC converter controls the first switch to turn off, so that the path between the DCDC converter and the battery is cut off, and the DCDC converter is prohibited from continuing to transmit charging current to the battery.

[0141] The present application provides a vehicle, which includes the low-voltage battery power supply system provided by the above-mentioned embodiment. The low-voltage battery power supply system has the function of delayed power replenishment, which can reduce the situation of battery power depletion and reduce the additional consumption of the battery pack. The cruising range of the vehicle equipped with this system is further improved.

[0142] In summary, the present application distinguishes the power supply modes of the entire vehicle. After the vehicle is powered off, the battery supplies power to low-power loads, and then based on the battery charge and the on-off control of the switch circuit, the battery is recharged, thereby effectively avoiding frequent battery depletion and reducing the extra loss of power from other power sources, thereby increasing the vehicle's endurance.

[0143] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0144] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0145] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0146] The above is a detailed introduction to a low-voltage battery power supply system and vehicle provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A low voltage battery power supply system, characterized in that: The low-voltage battery power supply system comprises: a battery, a control module, a voltage converter, a load module, a first switch and a second switch; One end of the battery is connected to the first end of the first switch and the first end of the second switch respectively, the second end of the first switch is connected to the voltage converter, and the second end of the second switch is connected to the load module; The control module is electrically connected to the battery, the control end of the first switch, the control end of the second switch and the voltage converter respectively, and is configured to transmit a first electrical signal to the control end of the first switch to close the first switch, transmit a second electrical signal to the control end of the second switch to turn off the second switch, and transmit a start signal to the voltage converter in response to the charge of the battery being lower than a first threshold. The voltage converter is configured to transmit a charging current to the battery via the first switch in response to the start signal, so as to charge the battery.

2. The low-voltage battery power supply system according to claim 1, characterized in that: The control module is further configured to transmit the second electrical signal to the control end of the first switch to turn off the first switch, transmit the first electrical signal to the control end of the second switch to close the second switch, and transmit a shutdown signal to the voltage converter to prohibit starting of the voltage converter in response to the charge of the battery being higher than a second threshold; Wherein, in the case where the voltage converter is prohibited from starting, it is further configured to stop transmitting the charging current on the path between the voltage converter and the battery in response to the shutdown signal; The battery is further configured to transmit current to the load module via the second end of the second switch in response to the second switch being closed, so as to supply power to the load module.

3. The low-voltage battery power supply system according to claim 2, characterized in that: The control module includes a battery management unit and a battery detection unit; One end of the battery detection unit is connected to one end of the battery, and the other end is connected to the battery management unit; The battery management unit is electrically connected to the voltage converter, the control end of the first switch and the control end of the second switch respectively; The battery detection unit is configured to transmit a third signal to the battery management unit; The battery management unit is configured to transmit the first electrical signal to the control terminal of the first switch to close the first switch, transmit the second electrical signal to the control terminal of the second switch to turn off the second switch, and transmit the start signal to the voltage converter in response to the third signal; The battery detection unit is further configured to transmit a fourth signal to the battery management unit; The battery management unit is configured to transmit the second electrical signal to the control end of the first switch to turn off the first switch, transmit the first electrical signal to the control end of the second switch to close the second switch, and transmit the shutdown signal to the voltage converter to prohibit the startup of the voltage converter in response to the fourth signal.

4. The low-voltage battery power supply system according to claim 1, characterized in that: The load module includes a first load and a second load, and the working voltage of the first load is higher than the working voltage of the second load; The first load is connected to the output terminal of the voltage converter; One end of the second load is connected to the second end of the second switch, and the other end is connected to the output end of the voltage converter, and the second load is electrically connected to the control module; The control module is configured to transmit the first electrical signal to the control terminal of the first switch to close the first switch in response to the charge of the battery being lower than a first threshold; and transmit the second electrical signal to the control terminal of the second switch to turn off the second switch, and transmit the start signal to the voltage converter; The voltage converter is configured to transmit the charging current to the battery via the first switch in response to the start signal, so as to charge the battery.

5. The low-voltage battery power supply system according to claim 1, characterized in that: The low-voltage battery power supply system also includes a battery pack; One end of the battery pack is connected to the input end of the voltage converter, and the other end is electrically connected to the control module; The battery pack is configured to deliver current to the voltage converter and the control module.

6. The low-voltage battery power supply system according to any one of claims 1 to 5, characterized in that: The low-voltage battery power supply system also includes a timing module, and the timing module is electrically connected to the control module; The control module is further configured to activate the timing module in response to the charge of the battery being lower than the first threshold; The timing module is configured to transmit time information to the control module at a first time after being activated, wherein the time information includes the first time; The control module is configured to transmit the second electrical signal to the second switch in response to the time information to turn off the second switch; The control module is also configured to transmit the start signal to the voltage converter in response to the time information being identical to the time threshold, and transmit the first electrical signal to the control end of the first switch to close the first switch, and the voltage converter transmits the charging current to the battery via the first switch.

7. The low-voltage battery power supply system according to claim 6, characterized in that: The control module is configured to transmit a shutdown signal to the voltage converter to prohibit starting of the voltage converter in response to the time information being less than the time threshold, and transmit the second electrical signal to the control terminal of the first switch to turn off the first switch, and transmit the second electrical signal to the control terminal of the second switch to turn off the second switch; When the voltage converter is prohibited from starting, the charging current transmitted on the path between the voltage converter and the battery disappears.

8. The low-voltage battery power supply system according to claim 1, characterized in that: An output current flows through the path connecting the control module and the battery; The control module is further configured to sample the output current flowing through the path, and in response to the sampled output current being higher than a current threshold, transmit the start signal to the voltage converter, and transmit the second electrical signal to the control terminal of the first switch to turn off the first switch, and transmit the second electrical signal to the control terminal of the second switch to turn off the second switch; The battery module is configured to stop transmitting current to the load module through the second end of the second switch in response to the second switch being turned off; The voltage converter is configured to deliver current to the load module in response to the start signal, and to stop delivering the charging current to the battery module along the first switch in response to the first switch being turned off.

9. The low-voltage battery power supply system according to claim 8, characterized in that: The control module is configured to transmit the first electrical signal to the control terminal of the first switch to close the first switch in response to the sampled output current being higher than a current threshold and in response to the charge of the battery being lower than a third threshold, so that the voltage converter transmits the charging current to the battery via the first switch; The third threshold is smaller than the first threshold and smaller than the second threshold.

10. A vehicle, characterized in that: The vehicle comprises the low-voltage battery power supply system according to any one of claims 1 to 9.

Images