Current detection circuit, power supply device and vehicle

Abstract

The utility model relates to a current detection circuit, a power supply device and a vehicle. The current detection circuit comprises a first sampling circuit, the first sampling circuit is connected in parallel with a power supply circuit, and the power supply circuit is connected between the positive electrode of a battery and the positive electrode of load equipment; the first sampling circuit is set to collect first reference data, related to power consumption, of the battery when the first sampling circuit is switched on; and the second sampling circuit is connected between the negative electrode of the battery and the negative electrode of the load equipment, and the second sampling circuit is set to acquire second reference data, related to power consumption, of the battery when the second sampling circuit is switched on.

Description

Technical Field

[0001] The utility model relates to the technical field of detection circuits, and more specifically, to a current detection circuit, a power supply device and a vehicle. Background Art

[0002] At present, batteries are one of the common power sources and can power load devices through power supply lines. In order to determine the power consumption of the battery, current sampling is usually performed on the negative side of the battery, and the power consumption of the battery is estimated by the sampled current. However, when the load device is running at a lower power consumption or only part of the load device is working, the current in the power supply line is small, resulting in a low accuracy of the collected current value, which affects the estimation of the actual power consumption of the battery. Utility Model Content

[0003] One object of the utility model is to provide a current detection circuit, a power supply device and a vehicle.

[0004] According to a first aspect of the utility model, there is provided a current detection circuit, comprising:

[0005] A first sampling circuit, wherein the first sampling circuit is connected in parallel with a power supply circuit, wherein the power supply circuit is connected between a positive electrode of a battery and a positive electrode of a load device; the first sampling circuit is configured to collect first reference data related to power consumption of the battery when the first sampling circuit is turned on;

[0006] The second sampling circuit is connected between the negative electrode of the battery and the negative electrode of the load device, and the second sampling circuit is configured to collect second reference data related to power consumption of the battery when it is turned on.

[0007] Optionally, when the battery meets a preset sampling condition, the first sampling circuit and the second sampling circuit are turned on.

[0008] Optionally, the power supply circuit includes a first switch; the power supply mode of the battery includes a set low current mode and a set normal mode, and the sampling condition includes that the battery is in the low current mode;

[0009] When the battery is in the low current mode, the first switch is disconnected; when the battery is in the normal mode, the first switch is closed, and the second sampling circuit is turned on and receives the third sampling signal output by the second sampling circuit.

[0010] Optionally, the first sampling circuit includes a first shunt and a second switch;

[0011] Wherein, the first end of the first shunt is connected to the first end of the second switch, the second end of the first shunt is connected to the first end of the power supply circuit, and the second end of the second switch is connected to the second end of the power supply circuit;

[0012] Wherein, when the second switch is closed, the first sampling circuit is turned on.

[0013] Optionally, the current detection circuit further includes an overload protection device, and the overload protection device is arranged on the first sampling circuit.

[0014] Optionally, the second sampling circuit includes a second shunt and a third switch;

[0015] Wherein, the first end of the second shunt is connected to the first end of the third switch, the second end of the second shunt is connected to the negative electrode of the battery, and the second end of the third switch is connected to the negative electrode of the load device;

[0016] Wherein, when the third switch is closed, the second sampling circuit is turned on.

[0017] Optionally, there are multiple small current modes, there are multiple first sampling circuits, and different first sampling circuits correspond one-to-one to different small current modes.

[0018] Optionally, there are multiple small current modes, and different small current modes correspond to the same first sampling circuit.

[0019] Optionally, the current detection circuit further includes a control circuit, and the control circuit is connected to the first sampling circuit and the second sampling circuit respectively;

[0020] The control circuit is used to control the on and off of the first sampling circuit and the second sampling circuit, and when the first sampling circuit and the second sampling circuit are turned on, receive the first reference data output by the first sampling circuit and the second reference data output by the second sampling circuit.

[0021] Optionally, the power supply device further includes a pre-charging circuit, which is connected in parallel with the power supply circuit, and the pre-charging circuit is configured to be turned on for a set time period before the power supply circuit is turned on.

[0022] According to a third aspect of the present utility model, a vehicle is provided, comprising a power battery, a load device and the power supply device as described in the second aspect;

[0023] The power supply device is connected between the power battery and the load device, and the power battery supplies power to the load device through the power supply device.

[0024] One technical effect of the utility model is that a first sampling circuit is arranged in the power supply line between the positive electrode of the battery and the load device, the first sampling circuit is connected to the second sampling circuit, and the power supply circuit is controlled to be disconnected, so that the two sampling circuits cooperate with each other to collect a smaller current in the power supply line, and then obtain a more accurate current value to determine the actual power consumption of the battery, thereby effectively reducing the occurrence of battery power outages.

[0025] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model.

[0027] Figure 1 is a block diagram of a current sensing circuit in some embodiments;

[0028] Figure 2 is a circuit diagram of a power supply device in some embodiments.

[0029] Description of reference numerals:

[0030] A first sampling circuit 10 ; a second sampling circuit 20 ; a control circuit 30 ; a pre-charging circuit 40 ; a power supply circuit 50 ; a battery 1 ; and a load device 2 . DETAILED DESCRIPTION

[0031] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0032] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0033] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0034] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0035] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0036] In order to detect the power consumption of the battery with a small current, a technical solution is proposed that can accurately detect the small current in the power supply line. It can be understood by those skilled in the art that the control scheme of the embodiment of the present disclosure is applicable to various electrical devices with batteries, such as mobile phones, electric vehicles, and computers. Taking the vehicle as the application scenario and combining with the accompanying drawings, various embodiments of the technical solution are described.

[0037] The technical solution provides a current detection circuit, such as Figure 1 As shown, the current detection circuit includes a first sampling circuit 10 and a second sampling circuit 20 .

[0038] The first sampling circuit 10 is, for example, an ammeter, a shunt, etc. The first sampling circuit 10 is connected in parallel with the power supply circuit 50, wherein the power supply circuit 50 is connected between the positive electrode of the battery 1 and the positive electrode of the load device 2, the power supply circuit 50 is, for example, a control switch, the control switch is, for example, a contactor, etc., and the load device 2 is, for example, a car refrigerator, a camera or a distance sensor, etc. The first sampling circuit 10 is configured to collect first reference data related to power consumption of the battery 1 when it is turned on.

[0039] The second sampling circuit 20 is, for example, an ammeter, a shunt, etc. The second sampling circuit 20 is connected between the negative electrode of the battery 1 and the negative electrode of the load device 2. The second sampling circuit 20 is configured to collect second reference data related to power consumption of the battery 1 when it is turned on. When the second sampling circuit 20 is turned on, the negative electrode of the battery 1 is connected to the negative electrode of the load device 2 through the second sampling circuit. The second sampling circuit can collect the current between the negative electrode of the battery 1 and the negative electrode of the load device 2 in the power supply line, and use the value of the current as the second reference data.

[0040] In other words, a first sampling circuit 10 is provided in the power supply line between the positive electrode of the battery 1 and the load device 2, and the first sampling circuit 10 is connected to the second sampling circuit 20, so that the two sampling circuits cooperate with each other to collect a smaller current in the power supply line, and then obtain a more accurate current value to determine the actual power consumption of the battery 1, thereby effectively reducing the occurrence of power outages of the battery 1.

[0041] In some embodiments, when the battery 1 meets a preset sampling condition, the first sampling circuit 10 and the second sampling circuit 20 are turned on.

[0042] In some examples, the battery 1 may have different power supply modes, and different power supply modes may correspond to different sampling conditions, and a power supply mode may correspond to one or more sampling conditions, and a sampling condition may correspond to one or more power supply modes, which are not limited here. When the battery 1 is powered in a power supply mode, the first sampling circuit 10 and the second sampling circuit 20 may be turned on and collect reference data related to power consumption of the battery 1 in the power supply mode if the battery 1 meets the sampling conditions corresponding to the power supply mode.

[0043] For example, the power supply module of the battery 1 may include a small current mode. When the battery 1 is powered in the small current mode, if the battery 1 meets the sampling conditions corresponding to the small current mode, the first sampling circuit 10 and the second sampling circuit 20 can be turned on and determine the power consumption of the battery 1 in the small current mode.

[0044] For another example, the power supply module of the battery 1 may include a normal mode. When the battery 1 supplies power in the normal mode, the first sampling circuit 10 and the second sampling circuit 20 may be turned on if the battery 1 meets the sampling conditions corresponding to the normal mode, and determine the power consumption of the battery 1 in the normal mode. In the normal mode, the load device 2 may operate normally under the power supply of the battery 1.

[0045] In some embodiments, the power supply mode of the battery 1 may include a low current mode, and the power supply circuit 50 may include a control switch. In the low current mode, the control switch is disconnected, so that the power supply circuit 50 is disconnected, and the first sampling circuit 10 is turned on. The battery 1 can supply power to the load device 2 through the first sampling circuit 10. The first sampling circuit 10 can collect the current between the positive electrode of the battery 1 and the positive electrode of the load device 2 in the power supply line, and use the value of the current as the first reference data. Among them, the power consumption of the battery 1 can be estimated by using the ampere-hour integration and the value of the collected current. This estimation method is a prior art and will not be elaborated in detail here.

[0046] In some examples, the power supply mode of the battery 1 may include a normal mode, the power supply circuit 50 may include a control switch and a resistor device connected in series, the first sampling circuit 10 is turned on, the power supply circuit 50 is also turned on, the battery 1 can supply power to the load device 2 through the power supply circuit 50, and the first sampling circuit 10 can collect the current on the resistor device to determine the current between the positive electrode of the battery 1 and the positive electrode of the load device 2 in the power supply line. The value of the current can be used as the third reference data. The third reference data can reflect the power consumption generated by the battery 1 supplying power to the load device 2 through the power supply circuit 50 in the normal mode.

[0047] In some embodiments, the current detection circuit further includes a control circuit 30, which is, for example, a control chip, etc. The control circuit 30 is electrically connected or communication-connected to the first sampling circuit 10 and the second sampling circuit 20, respectively, which is not limited here. The control circuit 30 can control the first sampling circuit 10 to be turned on or off, and can also control the second sampling circuit 20 to be turned on or off. The control circuit 30 is also connected to the control end of the power supply circuit 50 of the current detection circuit, so that the control circuit 30 can also control the power supply circuit 50 to be turned on or off. When the first sampling circuit 10 and the second sampling circuit 20 are turned on, the control circuit 30 receives the first reference data output by the first sampling circuit 10 and the second reference data output by the second sampling circuit 20.

[0048] In some examples, the driver can set the vehicle's load device 2 to run at a lower power consumption, or set only a designated part of the load device 2 to work, and at this time, the battery 1 enters the low current mode, and the control circuit 30 can control the first sampling circuit 10 and the second sampling circuit 20 to be turned on, and the power supply circuit 50 to be turned off, so as to receive the first reference data output by the first sampling circuit 10 and the second reference data output by the second sampling circuit 20. For example, the driver can set the vehicle to only turn on the camera or the ranging sensor when it is not driving. At this time, the battery 1 enters the low current mode, and the battery 1 can supply power to the load device 2 through the first sampling circuit 10. The first sampling circuit 10 can collect the current between the positive electrode of the battery 1 and the positive electrode of the load device 2, and feed it back to the control circuit 30 as the first reference data. The second sampling circuit 20 can also collect the current between the negative electrode of the battery 1 and the negative electrode of the load device 2, and feed it back to the control circuit 30 as the second reference data.

[0049] In other words, a first sampling circuit 10 is provided in the power supply line between the positive electrode of the battery 1 and the load device 2. When the battery 1 is in the low current mode, the control circuit 30 controls the first sampling circuit 10 and the second sampling circuit 20 to be turned on, and controls the power supply circuit 50 to be turned off, so that the two sampling circuits cooperate with each other to collect a smaller current in the power supply line, and then feed back a more accurate current value to the control circuit 30 to determine the actual power consumption of the battery 1.

[0050] In some embodiments, in order to detect the power consumption of the battery 1 when the current in the power supply line is large, such as Figure 2As shown, the power supply circuit 50 may include a first switch K1. After the driver starts the vehicle, the battery 1 may enter the normal mode. In the normal mode, the battery 1 may supply power to the load device 2 through the closed first switch K1. At this time, the load device 2 may operate at normal power consumption, and part or all of the load device 2 may work, which is not limited here. When the battery 1 is in the normal mode, the control circuit 30 is configured to control the first switch K1 to close and control the second sampling circuit 20 to turn on. The second sampling circuit 20 may collect the current in the power supply line at this time and feed it back to the control circuit 30 as a third sampling signal. The control circuit 30 may estimate the power consumption of the battery 1 in the normal mode through the third sampling signal. This estimation method is a prior art and is not elaborated in detail here. The battery 1 is in a set normal mode before entering the low current mode to ensure that the load device 2 can operate normally.

[0051] In some embodiments, Figure 2 As shown, the power supply circuit 50 includes a first switch K1, wherein the first end of the power supply circuit 50 is the first end of the first switch K1, and the second end of the power supply circuit 50 is the second end of the first switch K1. The first sampling circuit 10 includes a first shunt S1 and a second switch K2; wherein the first end of the first shunt S1 is connected to the first end of the second switch K2, the second end of the first shunt S1 is connected to the first end of the first switch K1, and the second end of the second switch K2 is connected to the second end of the first switch K1; wherein, when the second switch K2 is closed, the first sampling circuit 10 is turned on.

[0052] In this embodiment, the second switch K2 may be a contactor. When the second switch K2 is closed, the first sampling circuit 10 is turned on, and the second sampling circuit 20 is turned on, so that the battery 1 can supply power to the load device 2 through the first sampling circuit 10 and the second sampling circuit 20 .

[0053] In some examples, the control end of the second switch K2 may be connected to the control circuit 30, so that the opening or closing of the second switch K2 may be controlled by the control circuit 30. The second sampling circuit 20 may also be controlled by the control circuit 30.

[0054] In this embodiment, the first shunt S1 can be a high resistance shunt. When the battery 1 is in the low current mode, the first sampling circuit 10 is turned on, and the first shunt S1 can record the voltage across the first shunt S1. Moreover, the resistance of the first shunt S1 is a constant value, so the value of the current of the entire first sampling circuit 10 can be obtained. Since the resistance of the first shunt S1 is relatively large, the voltage divided is also relatively large, so a more accurate current value can be obtained, so that the power consumption estimated by the battery 1 in the low current mode is more accurate.

[0055] In some embodiments, the current detection circuit further includes an overload protection device, which is disposed on the first sampling circuit 10 .

[0056] In this embodiment, the overload protection device can control the first sampling circuit 10 to disconnect when the current value on the first sampling circuit 10 is large, so as to protect the load device 2 and the battery 1. The overload protection device can be connected in series between the battery 1 and the first shunt S1, can be connected in series between the second switch K2 and the load device 2, and can also be connected in series between the first shunt S1 and the second switch K2. For example, Figure 2 As shown, the overload protection device is a fuse FU1, and the fuse FU1 is connected in series between the first shunt S1 and the second switch K2.

[0057] In some embodiments, Figure 2 As shown, the second sampling circuit 20 includes a second shunt S2 and a third switch K3; wherein the first end of the second shunt S2 is connected to the first end of the third switch K3, the second end of the second shunt S2 is connected to the negative electrode of the battery 1, and the second end of the third switch K3 is connected to the negative electrode of the load device 2; wherein, when the third switch K3 is closed, the first sampling circuit is turned on.

[0058] In this embodiment, the third switch K3 may be a contactor, and when the first switch K1 and the third switch K3 are closed, the second sampling circuit 20 is turned on, and the battery 1 can supply power to the load device 2 in the normal mode. Subsequently, when the second switch K2 is closed, the first sampling circuit 10 is turned on, and then the first switch K1 is turned off, so that the battery 1 can supply power to the load device 2 in the low current mode. In other words, when the battery 1 is in the low current mode, the first shunt S1 and the second shunt S2 cooperate with each other to improve the accuracy of estimating the power consumption of the battery 1.

[0059] In some examples, the control end of the third switch K3 may be connected to the control circuit 30, so that the opening or closing of the third switch K3 may be controlled by the control circuit 30. The control end of the second switch K2 may be connected to the control circuit 30, so that the opening or closing of the second switch K2 may be controlled by the control circuit 30.

[0060] In some examples, in order to ensure the safety of the current detection circuit, when the battery 1 is in the low current mode, if the control circuit 30 determines through the first reference data and the second reference data that the current in the power supply line exceeds the set value, the control circuit 30 can control the second switch K2 to be disconnected and the first switch K1 to be turned on, and the battery 1 enters the normal mode. The set value is, for example, 100mA, 500mA, and 10A, etc., which are not limited here.

[0061] In some embodiments, there are multiple small current modes, and there are multiple first sampling circuits 10 , and different first sampling circuits 10 correspond one-to-one to different small current modes.

[0062] In this embodiment, the low current mode may include sentinel mode, vehicle-mounted device power supply mode, in-vehicle monitoring mode, cabin device power supply mode, etc. In different low current modes, different load devices 2 work or some load devices 2 operate with low power consumption. For example, in sentinel mode, the camera and ranging sensor of the vehicle work; in vehicle-mounted device power supply mode, the vehicle's onboard refrigerator works.

[0063] In some examples, the low current mode includes mode A, mode B and mode C, and the first sampling circuits 10 corresponding to the modes A, B and C are respectively connected in parallel with the first switch K1. When the battery 1 is in one of the modes A, B and C, the control circuit 30 can control the first sampling circuit 10 corresponding to the mode to be turned on, and control the first switch K1 to be turned off. The control circuit 30 can determine the power consumption of the battery 1 through the first reference data output by the first sampling circuit 10 and the second reference data output by the second sampling circuit 20. Since different low current modes correspond to different load devices 2, different first sampling circuits 10 can be set with shunts of different resistance values ​​to improve the accuracy of the reference data obtained by the control circuit 30, thereby further improving the accuracy of estimating the power consumption of the battery 1. Among them, the specific setting method of setting shunts of different resistance values ​​for different first sampling circuits 10 can be set according to artificial settings and is not limited here.

[0064] In some embodiments, there are multiple small current modes, and different small current modes correspond to the same first sampling circuit 10 .

[0065] In some examples, when the battery 1 is in one of the modes A, B and C, the control circuit 30 can control the first sampling circuit 10 to be turned on and the first switch K1 to be turned off. The control circuit 30 can determine the power consumption of the battery 1 through the first reference data output by the first sampling circuit 10 and the second reference data output by the second sampling circuit 20. The control circuit 30 can determine the power consumption in the mode according to the corresponding relationship between the current value and the power consumption in different built-in low current modes. The corresponding relationship is artificially set and is not limited here. In other words, by setting a first sampling circuit 10, the manufacturing cost of the current detection circuit can be effectively reduced.

[0066] According to an embodiment of the present disclosure, there is also provided a power supply device, comprising a battery, a power supply circuit and a current detection circuit as in any of the above embodiments; wherein the power supply circuit is connected between the battery and the load device, and the current detection circuit is connected between the battery and the load device, wherein the current detection circuit is used to collect first reference data and second reference data related to power consumption of the battery when it is turned on.

[0067] In other words, the current detection circuit in the power supply device can detect the power consumption of the battery in the low current mode to reduce the occurrence of power outages during use of the power supply device, thereby improving the safety of the power supply device.

[0068] In some embodiments, in order to improve the safety of the power supply device, such as Figure 2 As shown, the power supply device further includes a pre-charging circuit 40, and the power supply circuit 50 may include a first switch K1, the pre-charging circuit 40 is connected in parallel with the first switch K1, and the pre-charging circuit 40 is configured to be turned on for a set time before the first switch K1 is closed. The set time can be 5ms, 50ms or 1s, etc., which is not limited here.

[0069] In some examples, such as Figure 2 As shown, the pre-charging circuit 40 includes a pre-charging resistor R1 and a fourth switch K4, wherein the first end of the pre-charging resistor R1 is connected to the first end of the first switch K1, the second end of the pre-charging resistor R1 is connected to the first end of the fourth switch K4, and the second end of the fourth switch K4 is connected to the second end of the first switch K1. When entering the normal mode, the control circuit 30 can control the second sampling circuit 20 to be turned on, and control the fourth switch K4 to be closed for a set duration, and then the control circuit 30 controls the first switch K1 to be turned on, and then controls the fourth switch K4 to be turned off.

[0070] According to an embodiment of the present disclosure, a vehicle is also provided, comprising a power battery, a load device and a power supply device as in any of the above embodiments; wherein the power supply device is connected between the power battery and the load device, and the power battery supplies power to the load device through the power supply device.

[0071] In other words, the vehicle's power supply device can detect the power consumption of the power battery in the low current mode to reduce the occurrence of power battery power outages during the use of the vehicle, thereby improving the safety of the vehicle.

[0072] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A current detection circuit, characterized in that: include: A first sampling circuit, wherein the first sampling circuit is connected in parallel with a power supply circuit, wherein the power supply circuit is connected between a positive electrode of a battery and a positive electrode of a load device; the first sampling circuit is configured to collect first reference data related to power consumption of the battery when the first sampling circuit is turned on; a second sampling circuit, the second sampling circuit being connected between the negative electrode of the battery and the negative electrode of the load device, the second sampling circuit being configured to collect second reference data related to power consumption of the battery when the second sampling circuit is turned on; The first sampling circuit includes a first shunt and a second switch; Wherein, the first end of the first shunt is connected to the first end of the second switch, the second end of the first shunt is connected to the first end of the power supply circuit, and the second end of the second switch is connected to the second end of the power supply circuit; The second sampling circuit includes a second shunt and a third switch; The first end of the second shunt is connected to the first end of the third switch, the second end of the second shunt is connected to the negative electrode of the battery, and the second end of the third switch is connected to the negative electrode of the load device.

2. The current detection circuit according to claim 1, characterized in that: When the battery meets a preset sampling condition, the first sampling circuit and the second sampling circuit are turned on.

3. The current detection circuit according to claim 2, characterized in that: The power supply circuit includes a first switch; the power supply mode of the battery includes a set low current mode and a set normal mode, and the sampling condition includes that the battery is in the low current mode; When the battery is in the low current mode, the first switch is disconnected; when the battery is in the normal mode, the first switch is closed, and the second sampling circuit is turned on and receives the third sampling signal output by the second sampling circuit.

4. The current detection circuit according to claim 1, characterized in that: in, When the second switch is closed, the first sampling circuit is turned on.

5. The current detection circuit according to claim 4, characterized in that: The current detection circuit also includes an overload protection device, and the overload protection device is arranged on the first sampling circuit.

6. The current detection circuit according to claim 1, characterized in that: in, When the third switch is closed, the second sampling circuit is turned on.

7. The current detection circuit according to claim 3, characterized in that: There are multiple small current modes and multiple first sampling circuits, and different first sampling circuits correspond one-to-one to different small current modes.

8. The current detection circuit according to claim 3, characterized in that: There are multiple small current modes, and different small current modes correspond to the same first sampling circuit.

9. The current detection circuit according to any one of claims 1 to 8, characterized in that: The current detection circuit further includes a control circuit, and the control circuit is connected to the first sampling circuit and the second sampling circuit respectively; The control circuit is used to control the on and off of the first sampling circuit and the second sampling circuit, and when the first sampling circuit and the second sampling circuit are turned on, receive the first reference data output by the first sampling circuit and the second reference data output by the second sampling circuit.

10. A power supply device, characterized in that: comprising a storage battery, a power supply circuit and a current detection circuit as claimed in any one of claims 1 to 9; The power supply circuit is connected between the battery and the load device, and the current detection circuit is connected between the battery and the load device; the current detection circuit is used to collect first reference data and second reference data related to power consumption of the battery when it is turned on.

11. The power supply device according to claim 10, characterized in that: The power supply device further comprises a pre-charging circuit, which is connected in parallel with the power supply circuit and is configured to be turned on for a set time period before the power supply circuit is turned on.

12. A vehicle, characterized in that: Comprising a power battery, a load device and a power supply device as claimed in claim 10 or 11; The power supply device is connected between the power battery and the load device, and the power battery supplies power to the load device through the power supply device.

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