Battery management system and vehicle

Abstract

The utility model relates to a battery management system and a vehicle. The battery management system comprises a power supply switch used for connecting or disconnecting a power supply circuit between a storage battery on a vehicle and electric equipment on the vehicle; the first output end of the control device is electrically connected with the power supply switch, and the control device is used for selectively switching off or switching on the power supply switch; the first end of the vehicle door unlocking switch is electrically connected with the first input end of the control device, and the vehicle door unlocking switch is used for triggering the control device to close the power supply switch under the condition that the vehicle door of the vehicle is opened from the outside of the vehicle. Thus, the vehicle door unlocking switch triggers the control device to close the power supply switch under the condition that the vehicle door is opened from the outside of the vehicle, so that the storage battery supplies power to electric equipment on the vehicle, a battery sensor system does not need to be awakened to recognize the electric quantity state of the battery, and power consumption of the system is reduced. In addition, due to the fact that an external power source is not needed for power connection or trailer rescue is not needed, the vehicle using convenience of the user is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of vehicles, and in particular to a battery management system and a vehicle. BACKGROUND

[0002] Nowadays, the main failure mode in the field of automobile low-voltage power supply system is battery depletion and aging, which causes the vehicle to be unable to start after failure, and needs to be connected to an external power supply or towed for rescue, and in severe cases, the battery needs to be replaced, which has a serious impact on the user's vehicle experience.

[0003] In recent years, with the continuous progress of technology, some new energy vehicle models have begun to use 12V lithium-ion batteries to replace traditional lead-acid batteries. The 12V lithium-ion battery is configured with a battery management system, which can intelligently manage based on the battery state, realize more accurate battery state monitoring, intelligent power compensation and power depletion protection, and achieve better vehicle experience. 12V lithium-ion batteries are rapidly promoted to high-end new energy vehicles. However, for medium and low-end vehicles, the design cost of materials is limited, and the application of 12V lithium-ion batteries is restricted. CONTENT OF THE UTILITY MODEL

[0004] To overcome the problems in the related art, the present disclosure provides a battery management system and a vehicle.

[0005] According to a first aspect of an embodiment of the present disclosure, a battery management system is provided, comprising:

[0006] A power supply switch is configured to turn on or off a power supply circuit between a battery on a vehicle and an electrical device on the vehicle.

[0007] A control device is electrically connected to the power supply switch at a first output end, and is configured to selectively turn off or close the power supply switch.

[0008] A door unlocking switch is electrically connected to the control device at a first input end, and is configured to trigger the control device to close the power supply switch when a door of the vehicle is opened from the outside.

[0009] Optionally, a second end of the door unlocking switch is grounded, and the door unlocking switch is configured to be closed when the door of the vehicle is opened from the outside to trigger the first input end of the control device to switch from high level to low level.

[0010] The control device is configured to close the power supply switch when the level of the first input end switches from high level to low level.

[0011] Optionally, the battery management system further comprises:

[0012] a battery state detection device, an input end of the battery state detection device being configured to be electrically connected with the storage battery, and an output end of the battery state detection device being connected with a second input end of the control device;

[0013] the control device is configured to, when the vehicle is in a non-driving state, disconnect the power supply switch according to the battery state output by the battery state detection device.

[0014] Optionally, the battery state detection device comprises a sampling element and a voltage detection circuit.

[0015] The sampling element is configured to be connected in series with the storage battery, and the voltage detection circuit is respectively electrically connected with the sampling element and the storage battery.

[0016] Optionally, the battery state detection device further comprises a current detection circuit and a temperature detection sensor.

[0017] Optionally, the power supply switch comprises a metal oxide semiconductor (MOS) tube.

[0018] A gate of the metal oxide semiconductor (MOS) tube is connected with a first output end of the control device, a source of the metal oxide semiconductor (MOS) tube is connected with the electrical equipment, and a drain of the metal oxide semiconductor (MOS) tube is connected with the storage battery.

[0019] Optionally, the battery management system further comprises a charging switch.

[0020] The charging switch is configured to turn on or off a charging circuit between a high-voltage electrical system on the vehicle and the storage battery.

[0021] A control end of the charging switch is connected with a second output end of the control device.

[0022] The control device is configured to selectively disconnect or close the charging switch.

[0023] Optionally, the control device is further configured to close the charging switch when an amount of electricity of the storage battery is less than an electricity threshold, and control the high-voltage electrical system to charge the storage battery.

[0024] Optionally, the vehicle door unlocking switch is arranged at a door handle outside the vehicle door.

[0025] According to a second aspect of the embodiments of the present disclosure, a vehicle is provided, comprising a storage battery, electrical equipment, and the battery management system according to any one of the first aspect of the embodiments of the present disclosure.

[0026] Optionally, the storage battery is a lead-acid storage battery.

[0027] By adopting the technical scheme, the vehicle door unlocking switch can trigger the control device to close the power supply switch when the vehicle door is opened from the outside, so that the battery supplies power to the electrical equipment on the vehicle, without the need to wake up the battery sensor system to identify the power state of the battery, thereby reducing the power consumption of the system. In addition, since external power supply is not required, the convenience of the user is improved.

[0028] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0030] Figure 1 is a block diagram of a battery management system according to an exemplary embodiment.

[0031] Figure 2 is a schematic diagram of a battery management system according to an exemplary embodiment.

[0032] Figure 3 is a workflow diagram of a battery management system according to an exemplary embodiment. DETAILED DESCRIPTION

[0033] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, the same numbers refer to the same elements in all the figures. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure. Instead, they only represent examples of apparatuses and methods consistent with some aspects of the present disclosure, as detailed in the appended claims.

[0034] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the corresponding data protection regulations and policies of the country where the device is located, and with the authorization of the owner of the corresponding device.

[0035] With the continuous improvement of the intelligent degree of the automobile, the abnormality of the vehicle controller is prone to cause the increase of the power consumption, and for the vehicle model using the low-cost lead-acid battery, the battery is prone to cause the problem of power loss. After the power loss of the storage battery, in the prior art, an external power supply needs to be connected to provide power or a tow truck needs to be rescued, and the power of the storage battery also needs to be frequently detected to determine whether the storage battery continues to supply power to the power consumption equipment in the vehicle. However, since the battery sensor system needs to be woken up to identify the power state of the battery, the power consumption of the system is increased, and in addition, since the external power supply needs to be connected to provide power or the tow truck needs to be rescued, the convenience of the user in using the vehicle is affected.

[0036] Therefore, the present disclosure provides a battery management system and a vehicle. In the battery management system, a control device is connected with a vehicle door unlocking switch. The vehicle door unlocking switch can trigger the control device to close a power supply switch to make the storage battery supply power to the user equipment on the vehicle when the vehicle door is opened from the outside. The battery sensor system does not need to be woken up to identify the power state of the battery, thereby reducing the power consumption of the system. In addition, since the external power supply does not need to be connected to provide power or the tow truck does not need to be rescued, the convenience of the user in using the vehicle is improved.

[0037] Figure 1 FIG. 1 is a block diagram of a battery management system according to an exemplary embodiment. As shown in FIG. 1, the battery management system 100 can include a power supply switch 101, a control device 102, and a vehicle door unlocking switch 103. Figure 1

[0038] The power supply switch 101 is connected with a storage battery 200 on the vehicle and a power consumption equipment 300 on the vehicle, respectively, and is used to turn on or turn off the power supply circuit between the storage battery 200 and the power consumption equipment 300.

[0039] For example, if the power supply switch 101 is closed, the storage battery 200 can supply power to the power consumption equipment 300 through the power supply circuit, and if the power supply switch 101 is turned off, the storage battery 200 is prohibited to supply power to the power consumption equipment 300.

[0040] In addition, the power supply switch can be a relay or a semiconductor switch, for example, the semiconductor switch can be a metal oxide semiconductor (MOS) tube or a field effect tube, etc.

[0041] A first output end of the control device 102 is electrically connected with the power supply switch 101, and the control device 102 is used to selectively turn off or close the power supply switch 101.

[0042] For example, the control device 102 can be a microcontroller unit (MCU) on the vehicle, which can turn off the power supply switch 101 according to the state of the storage battery, for example, the control device 102 can control the power supply switch 101 to be turned off when the storage battery is in a power loss state.​

[0043] A first end of the door unlock switch 103 is electrically connected to a first input end of the control device 102, and the door unlock switch 103 is configured to trigger the control device 102 to close the power supply switch 101 when a door of the vehicle is opened from outside.

[0044] It should be understood that when the door is detected to be opened from outside, it can be determined that the user gets on the vehicle, at this time, the power supply switch 101 can be closed to enable the battery to supply power to the user equipment to support the functions of vehicle unlocking, power-on and driving.

[0045] With the above technical solution, the door unlock switch can trigger the control device to close the power supply switch when the door of the vehicle is opened from outside, so that the battery supplies power to the electrical equipment on the vehicle, without the need to wake up the battery sensor system to identify the state of charge of the battery, thereby reducing the power consumption of the system. In addition, since external power supply is not required for power connection or towing rescue, the convenience and safety of the user using the vehicle are improved.

[0046] Figure 2 is a schematic diagram of a battery management system according to an exemplary embodiment. As shown in Figure 2 A first end of the door unlock switch 103 is electrically connected to a first input end of the control device 102, and a second end of the door unlock switch 103 is grounded, so that the door unlock switch 103 is closed when the door of the vehicle is opened from outside, thereby pulling the voltage at the first input end of the control device 102 low, i.e., triggering the first input end of the control device 102 to switch from high level to low level, and then the control device 102 closes the power supply switch 103 when the level at the first input end thereof switches from high level to low level.

[0047] In this embodiment, the door unlock switch 103 can be closed when the Bluetooth identifies the vehicle key, when the vehicle owner is identified by biometric information, or when the user pulls the door handle of the vehicle door.

[0048] In the present disclosure, in the scenario of unlocking the vehicle door by Bluetooth identification or biometric information identification, the door unlock switch can be arranged at any position, which is not specifically limited in the present disclosure.

[0049] However, considering the scenario that the user unlocks the door by pulling the door handle, the door unlock switch 103 can be arranged at the door handle outside the door. In this way, when the user unlocks the door by any means, the door unlock switch can be in a closed state, facilitating the user to unlock the door.

[0050] As shown in Figure 2As shown, the battery management system 100 can further include a battery state detection device 104. An input end of the battery state detection device 104 is electrically connected with the storage battery, and an output end of the battery state detection device 104 is connected with a second input end of the control device 102.

[0051] The control device 102 is configured to disconnect the power supply switch 101 according to the battery state output by the battery state detection device 104 when the vehicle is in the non-driving state.

[0052] In an embodiment, the battery state detection device 104 can include a sampling element 1041 and a voltage detection circuit 1042. The sampling element 1041 is connected in series with the storage battery 200, and the voltage detection circuit 1042 is electrically connected with the sampling element 1041 and the storage battery 200 respectively. For example, as shown in the figure, the sampling element 1041 is connected in series with the storage battery 200, one end of the voltage detection circuit 1042 is grounded, and the other end is connected with the connection point of the sampling element 1041 and the storage battery 200 to collect the voltage parameter of the storage battery 200. The sampling element 1041 can be a resistor. Figure 2

[0053] In this embodiment, the control device 102 can disconnect the power supply switch 101 according to the voltage parameter of the storage battery 200 detected by the battery state detection device 104 when the vehicle is in the non-driving state. For example, if the voltage parameter is less than a first preset voltage threshold U1, it is considered that the storage battery 200 is in a low power state, and at this time, the power supply switch 101 is disconnected to prohibit the storage battery 200 from supplying power to the electric equipment 300 to save a certain amount of power.

[0054] In another embodiment, the battery state detection device 104 further includes a current detection circuit 1043 and a temperature detection sensor. The current detection circuit 1043 is connected in parallel with the sampling element 1041 to determine the current parameter of the storage battery 200 according to the voltage across the sampling element 1041 and the resistance value thereof. The temperature detection sensor is arranged in the storage battery to collect the temperature parameter of the storage battery. The control device 102 can determine the remaining state of charge SOC of the storage battery 200 according to the voltage parameter collected by the voltage detection circuit 1042, the current parameter collected by the current detection circuit 1043, and the temperature parameter collected by the temperature detection sensor. For example, the control device 102 considers that the storage battery 200 is in a low power state when the remaining state of charge SOC is less than a first state of charge threshold SOC1, and at this time, the power supply switch 101 is disconnected to prohibit the storage battery 200 from supplying power to the electric equipment 300.

[0055] It should be understood that determining the remaining state of charge of the battery according to the voltage parameter, the current parameter and the temperature parameter is a relatively mature technology, and the present disclosure does not make specific limitations thereon.

[0056] As​Figure 2 As shown, the power supply switch 101 can include a metal oxide semiconductor (MOS) transistor Q1. The gate of the MOS transistor Q1 is connected to the first output of the control device 102, the source of the MOS transistor Q1 is connected to the electrical equipment 300, and the drain of the MOS transistor Q1 is connected to the battery 200. For example, the drain of the MOS transistor Q1 is connected to the battery 200 via the sampling element 1041.

[0057] In Figure 2 which the vehicle door unlocking switch 103 is closed when the vehicle door is opened from the outside, and the first input of the control device 102 is switched from high level to low level, and the first output of the control device 102 outputs high level, i.e. the gate of the MOS transistor Q1 inputs high level, and the MOS transistor Q1 is closed. The second input of the control device 102 is connected to the output of the battery state detection device 104. When the voltage parameter of the battery is less than the first preset voltage threshold U1, or the remaining state of charge SOC is less than the first state of charge threshold SOC1, the first output of the control device 102 outputs low level, i.e. the gate of the MOS transistor Q1 inputs low level, and the MOS transistor Q1 is open.

[0058] In addition, when the battery 200 is in a low power state or a depleted state, in order to avoid external power connection or towing rescue, the high-voltage electrical system on the vehicle can also be controlled to charge the battery 200. Therefore, in one embodiment, the battery management system can further include a charging switch.

[0059] The charging switch is used to turn on or off the charging circuit between the high-voltage electrical system on the vehicle and the battery; the control terminal of the charging switch is connected to the second output of the control device; and the control device is used to selectively open or close the charging switch.

[0060] For example, the control device is further used to close the charging switch when the power of the battery is less than the energy threshold, and control the high-voltage electrical system to charge the battery. The power can be the voltage of the battery or the remaining state of charge of the battery.

[0061] Considering that when the battery is in a depleted state, the battery supplying power to the electrical equipment will cause deep depletion and affect the service life of the battery, therefore, in one embodiment, after the control device controls the power supply switch to be closed, the control device can further control the charging switch to be closed and the high-voltage electrical system to be pulled up, so as to turn on the charging circuit between the high-voltage electrical system on the vehicle and the battery, and then use the high-voltage electrical system to charge the battery.

[0062] In another embodiment, after the control device controls the power supply switch to be closed, if the user further controls the vehicle to be powered on, i.e., the user inputs a request to pull up the high-voltage electrical system, the control device controls the charging switch to be closed to turn on the charging circuit between the high-voltage electrical system and the storage battery on the vehicle, and then charges the storage battery using the high-voltage electrical system.

[0063] In addition, the control device 102 can also automatically request to pull up the high-voltage system and control the charging switch to be closed to perform intelligent power compensation when it is determined that the voltage of the storage battery is less than a second preset voltage threshold U2, or the remaining state of charge SOC is less than a second state of charge threshold SOC2, according to the battery state detected by the battery state detection device 104. During the process of power compensation or charging, the charging can be performed according to the optimal charging strategy, such as the optimal charging voltage and charging current. U2 is greater than U1, and SOC2 is greater than SOC1.

[0064] Figure 3 is a working flow chart of a battery management system according to an exemplary embodiment. As shown in Figure 3 When parking, the voltage and SOC of the storage battery are continuously collected, and if the voltage < U2 or the SOC < SOC2, the high-voltage system is requested to perform high-voltage power compensation. During the process of power compensation, if the SOC > SOC2-1, the power compensation is stopped and the voltage and SOC of the storage battery are continuously collected, otherwise the high-voltage power compensation is continued. If the voltage < U1 or the SOC < SOC1, Q1 is disconnected to stop the power supply of the whole vehicle. Then, if the door handle is detected, Q1 is closed to restore the power supply of the whole vehicle. Finally, the vehicle is unlocked and awakened, and the high-voltage driving is performed.

[0065] Based on the same concept, the disclosure also provides a vehicle comprising a storage battery, a power-consuming device, and a battery management system provided by the disclosure.

[0066] The storage battery can be a lead-acid storage battery.

[0067] Furthermore, the word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects or designs. Rather, use of the word exemplary is intended to present concepts in a concrete manner. As used in this application, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or clear from context, "X employs A or B" is intended to mean any of the natural inclusive permutations. That is, if X employs A; X employs B; or X employs both A and B, then "X employs A or B" is satisfied under any of the foregoing instances. In addition, the articles "a" and "an" as used in this application and the appended claims should generally be construed to mean "one or more" unless specified otherwise or clear from context to be directed to a singular form. Thus, use of the articles in this application and the following claims is not limiting.

[0068] Also, although the disclosure has been described with respect to only one or more implementations thereof, those skilled in the art will readily appreciate that other alternatives can be used. It is contemplated that the disclosure can be carried out in other specific ways than those expressly disclosed herein. Any and all such changes, modifications, variations, and improvements that have been or can be made to the present disclosure are intended to be captured by the scope of the claims.

[0069] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the features disclosed herein. This application is intended to cover any and all variations of the disclosure that come within the scope of the claims, and it is intended that the claims be interpreted in the broadest possible way consistent with the nature of the claims. The specification and examples given herein are intended to be illustrative only and not in a limiting sense. Since those skilled in the art will be able to recognize, in the light of the foregoing disclosure, certain modifications within the scope of the disclosure, it will be recognized that the true scope of the disclosure is to be determined by the broadest possible interpretation of the principles thereof in view of the specification and appended claims.

[0070] It should be understood that the present disclosure is not limited to the precise structures herein described and illustrated in the drawings and that various modifications and changes can be made therein without departing from the scope thereof. The scope of the present disclosure is to be limited only by the appended claims.

Claims

1. A battery management system, characterized by, The battery management system comprises: a power supply switch for conducting or disconnecting a power supply circuit between a battery on a vehicle and an electrical device on the vehicle; a control device, a first output terminal of the control device being electrically connected to the power supply switch, the control device being configured to selectively disconnect or close the power supply switch; a door unlocking switch, a first terminal of the door unlocking switch being electrically connected to a first input terminal of the control device, the door unlocking switch being configured to trigger the control device to close the power supply switch when a door of the vehicle is opened from outside.

2. The battery management system of claim 1, wherein, a second terminal of the door unlocking switch being grounded, the door unlocking switch being configured to be closed when the door of the vehicle is opened from outside to trigger the first input terminal of the control device to switch from high level to low level; the control device being configured to close the power supply switch when the level of the first input terminal switches from high level to low level.

3. The battery management system of claim 1, wherein, The battery management system further comprises: a battery state detection device, an input terminal of the battery state detection device being configured to be electrically connected to the battery, an output terminal of the battery state detection device being connected to a second input terminal of the control device; the control device being configured to disconnect the power supply switch according to a battery state output by the battery state detection device when the vehicle is in a non-driving state.

4. The battery management system of claim 3, wherein, The battery state detection device comprises a sampling element and a voltage detection circuit; the sampling element being configured to be connected in series with the battery, the voltage detection circuit being electrically connected to the sampling element and the battery respectively.

5. The battery management system of claim 4, wherein, The battery state detection device further comprises a current detection circuit and a temperature detection sensor.

6. The battery management system of any one of claims 1-5, wherein, The power supply switch comprises a metal oxide semiconductor (MOS) tube; a gate of the metal oxide semiconductor (MOS) tube being connected to the first output terminal of the control device, a source of the metal oxide semiconductor (MOS) tube being connected to the electrical device, and a drain of the metal oxide semiconductor (MOS) tube being connected to the battery.

7. The battery management system of any one of claims 1-5, wherein, The battery management system further comprises a charging switch; the charging switch being configured to conduct or disconnect a charging circuit between a high-voltage electrical system on the vehicle and the battery; a control terminal of the charging switch being connected to a second output terminal of the control device; the control device being configured to selectively disconnect or close the charging switch.

8. The battery management system of claim 7, wherein, The control device is further configured to close the charging switch when the battery has an electric quantity less than an electric energy threshold value, and to control the high-voltage electrical system to charge the battery.

9. The battery management system of any one of claims 1-5, wherein, The door unlocking switch is arranged at a door handle outside the door.

10. A vehicle characterized by comprising: The vehicle comprises a battery, an electrical device, and the battery management system according to any one of claims 1-9.

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