Signal sampling circuit, battery management system, battery system and electrical apparatus

Abstract

A signal sampling circuit, a battery management system, a battery system and an electrical apparatus. The signal sampling circuit (10) comprises a first voltage divider module (11), a first switch module (12) and a sampling module (13), wherein the first voltage divider module (11) and the first switch module (12) are connected in series between a point to be tested and a reference signal terminal of the sampling module (13), a first control terminal of the first switch module (12) is connected to a first power supply terminal, a second control terminal of the first switch module (12) is connected to an enable signal terminal of the sampling module (13), the sampling module (13) is connected to a first reference ground, the first voltage divider module (11) is internally provided with a sampling point, and the sampling module (13) is used for collecting a sampling signal at the sampling point. The present application helps to reduce the cost of signal sampling circuits.

Description

Signal sampling circuit, battery management system, battery system and power consumption device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202323264267.5, filed on November 30, 2023, entitled “Signal sampling circuit, battery management system, battery system and electrical device,” and the entire contents of that application are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a signal sampling circuit, a battery management system, a battery system, and an electrical device. Background Art

[0004] With the continuous development of battery technology, people's requirements for batteries are getting higher and higher.

[0005] In the related art, a signal sampling circuit is provided to sample the test point, but the signal sampling circuit in the related art has the problem of high cost.

[0006] Summary of the Invention

[0007] The present application provides a signal sampling circuit, a battery management system, a battery system, and an electrical device, which help reduce the cost of the signal sampling circuit.

[0008] In a first aspect, the present application provides a signal sampling circuit, which includes a first voltage divider module, a first switch module, and a sampling module; wherein,

[0009] The first voltage divider module and the first switch module are connected in series between the point to be measured and the reference signal terminal of the sampling module, the first control terminal of the first switch module is connected to the first power terminal, the second control terminal of the first switch module is connected to the enable signal terminal of the sampling module, and the sampling module is connected to the first reference ground;

[0010] The first voltage divider module is provided with a sampling point, and the sampling module is used to collect a sampling signal at the sampling point.

[0011] In an embodiment of the present application, the first control end of the first switch module is connected to the first power supply end. When the test point is a high-voltage test point, the first power supply end may be a high-voltage power supply end, and the first reference ground may be a high-voltage ground. The first control end of the first switch module is connected to the first power supply end, and the second control end of the first switch module is connected to the enable signal end of the sampling module. The sampling module is connected to the high-voltage ground. Therefore, the sampling module is on the high-voltage side, so that the control end and the controlled end of the first switch module are both on the high-voltage side. Therefore, compared with the use of high-insulation and voltage-resistant devices, the control end and the controlled end of the first switch module help to reduce the cost of the signal sampling circuit.

[0012] In an optional embodiment of the first aspect, the signal sampling circuit further includes a second switch module, the second switch module being connected between a second control terminal of the first switch module and a first reference ground, the control terminal of the second switch module being connected to an enable signal terminal, and the second switch module being configured to be turned on or off under the control of a control signal provided by the enable signal terminal, thereby controlling the first switch module to be turned on or off. In this manner, if the control signal provided by the enable signal terminal is unable to drive the first switch module to be turned on or off, the control signal provided by the enable signal terminal can be used to drive the second switch module to be turned on or off, thereby controlling the first switch module to be turned on or off, thereby improving the driving capability of the signal sampling circuit.

[0013] In an optional embodiment of the first aspect, the signal sampling circuit further includes a second voltage divider module connected between the first power supply terminal and the enable signal terminal. Thus, by providing the second voltage divider module between the first power supply terminal and the enable signal terminal, the voltages at the first control terminal and the second control terminal of the first switch module are reduced, thereby protecting the first switch module.

[0014] In an optional embodiment of the first aspect, the first voltage divider module includes a voltage divider submodule, in which a sampling point is provided; the first switch module includes a relay, the relay includes a coil and a contact group, the voltage divider submodule and the contact group are connected in series between the point to be measured and the reference signal terminal of the sampling module, the first end of the coil is connected to the first power supply terminal, and the second end of the coil is connected to the enable signal terminal. In this way, the voltage of the contact group of the relay is reduced by a voltage divider submodule and a contact group of the relay, thereby protecting the relay. In addition, the voltage of the second end of the coil of the relay is controlled by the enable signal terminal, thereby controlling the conduction of the contact group of the relay, so that the sampling module can collect the sampling signal of the sampling point.

[0015] In an optional embodiment of the first aspect, the first voltage divider module includes N voltage divider submodules, each of which is provided with a sampling point, wherein N is an integer greater than or equal to 2; the first switch module includes a relay, the relay includes a coil and N contact groups, the voltage divider submodule and the contact group are connected in series one-to-one to form N branches, one end of the N branches is connected one-to-one with the N points to be measured, the other end of the N branches is connected to the reference signal terminal, the first end of the coil is connected to the first power supply terminal, and the second end of the coil is connected to the enable signal terminal. In this way, the voltage is divided by the N voltage divider submodules and the N contact groups of the relay one-to-one, thereby reducing the voltage of the N contact groups of the relay, thereby protecting the relay. In addition, N branches are formed by connecting the voltage divider submodule and the contact group in series one by one, and one end of the N branches is connected one by one to the N points to be tested. Then, the voltage at the second end of the coil is controlled by the enable signal end, and the N contact groups can be controlled to be turned on or off at the same time, so that the sampling module can simultaneously collect sampling signals of N sampling points corresponding to the N points to be tested.

[0016] In an optional embodiment of the first aspect, the second switch module includes a transistor. Thus, by providing the transistor in the second switch module, when the control signal provided by the enable signal terminal is unable to drive the first switch module on or off, the control signal provided by the enable signal terminal can drive the transistor on or off, thereby controlling the first switch module to be on or off, thereby improving the driving capability of the signal sampling circuit.

[0017] In an optional embodiment of the first aspect, the transistor includes a triode or a MOS transistor. Thus, by providing the triode or MOS transistor in the second switch module, when the control signal provided by the enable signal terminal is unable to drive the first switch module on or off, the control signal provided by the enable signal terminal can drive the triode or MOS transistor on or off, thereby controlling the first switch module to be on or off, thereby improving the driving capability of the signal sampling circuit.

[0018] In an optional embodiment of the first aspect, the voltage divider submodule includes a first resistor and a second resistor, the first resistor and the second resistor being connected in series, and the sampling point being located between the first resistor and the second resistor. Thus, by providing the first resistor and the second resistor in the voltage divider submodule, the voltage across one or N contact groups of the relay can be reduced, thereby protecting the relay. Furthermore, the voltage across the second resistor can be flexibly controlled by adjusting the number and resistance value of the first resistors.

[0019] In an optional embodiment of the first aspect, the second voltage divider module includes a third resistor. Thus, by providing the third resistor in the second voltage divider module, the voltages on the first control terminal and the second control terminal of the first switch module can be reduced, thereby protecting the first switch module.

[0020] Based on the same inventive concept, in a second aspect, an embodiment of the present application further provides a battery management system, the battery management system comprising:

[0021] Controller;

[0022] Isolation communication module;

[0023] And the signal sampling circuit of any one of the first aspects, wherein the sampling module in the signal sampling circuit is connected to the controller via the isolation communication module.

[0024] Based on the same inventive concept, in a third aspect, an embodiment of the present application further provides a battery system, including a battery and the battery management system of the second aspect.

[0025] Based on the same inventive concept, in a second aspect, an embodiment of the present application further provides an electrical device, which includes the battery management system of the second aspect.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0028] FIG1 is a schematic structural diagram of a signal sampling circuit according to an embodiment of the present application;

[0029] FIG2 is a schematic structural diagram of a signal sampling circuit according to another embodiment of the present application;

[0030] FIG3 is a schematic structural diagram of a signal sampling circuit according to another embodiment of the present application;

[0031] FIG4 is a schematic structural diagram of a signal sampling circuit according to another embodiment of the present application;

[0032] FIG5 is a schematic structural diagram of a signal sampling circuit according to another embodiment of the present application;

[0033] FIG6 is a schematic structural diagram of a signal sampling circuit according to another embodiment of the present application;

[0034] FIG7 is a schematic structural diagram of a battery management system according to an embodiment of the present application;

[0035] FIG8 is a schematic structural diagram of a battery system according to an embodiment of the present application;

[0036] FIG9 is a schematic structural diagram of an electrical device according to an embodiment of the present application.

[0037] Explanation of component symbols: 10, signal sampling circuit; 11, first voltage divider module; 111, voltage divider sub-module; 12, first switch module; 13, sampling module; 14, second switch module; 15, second voltage divider module; 20, isolation communication module; 30, controller; 100, battery management system; 200, battery; 1000, battery system; 2000, electrical device; EN2, enable signal terminal; S, sampling point; HV-GND, first reference ground; LV-GND, second reference ground; HV1, point to be tested; Vref, reference signal terminal; VDD, first power supply terminal; V1, first sampling terminal. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0041] The signal sampling circuit in the related art needs to have the function of high insulation and voltage resistance, but the cost of electronic devices with high insulation and voltage resistance is high, which leads to the problem of high cost of the signal sampling circuit in the related art.

[0042] The embodiments of the present application provide a signal sampling circuit, a battery management system, a battery system, and an electrical device. The signal sampling circuit provided in the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0043] The following first introduces the signal sampling circuit provided by the embodiment of the present application.

[0044] As shown in FIG1 , the signal sampling circuit 10 provided in the embodiment of the present application may include a first voltage dividing module 11 , a first switch module 12 and a sampling module 13 ; wherein,

[0045] The first voltage divider module 11 and the first switch module 12 can be connected in series between the test point HV1 and the reference signal terminal Vref of the sampling module 13. The first control terminal of the first switch module 12 can be connected to the first power supply terminal VDD, the second control terminal of the first switch module 12 can be connected to the enable signal terminal EN2 of the sampling module 13, and the sampling module 13 can be connected to the first reference ground HV-GND.

[0046] For example, the first reference ground HV-GND may be the negative electrode of the battery pack to be tested. In other words, the first reference ground HV-GND may be a high voltage ground.

[0047] Exemplarily, the first reference ground HV-GND may serve as the reference signal terminal Vref, that is, the signal value of the first reference ground HV-GND may be equal to the signal value of the reference signal terminal Vref.

[0048] Exemplarily, the test point HV1 may be connected to the positive electrode of the battery pack BAT to be tested.

[0049] Exemplarily, the sampling module 13 may include a sampling chip. The sampling chip may be used to collect sampling signals from the sampling point S and control the first switch module 12 to be turned on or off. The sampling chip may include an analog-to-digital converter (ADC) that converts the collected sampling signals from analog signals to digital signals.

[0050] The second control terminal of the first switch module 12 can be connected to the enable signal terminal EN2 of the sampling module 13, and the control signal of the enable signal terminal EN2 can control the voltage at the second terminal of the first switch module 12, thereby controlling whether the first switch module 12 is turned on or off. For example, the control signal may include an enable signal and a disable signal. The first switch module 12 can be turned on when the enable signal terminal EN2 outputs an enable signal, and can be turned off when the enable signal terminal EN2 outputs a disable signal. In other words, the enable signal can be a signal that can turn on the first switch module 12, and the disable signal can be a signal that can turn off the first switch module 12. For example, if the first switch module 12 includes a relay, and the relay includes a coil and a contact group, the enable signal can be a low-level signal, and the disable signal can be a high-level signal.

[0051] A sampling point S may be provided in the first voltage dividing module 11 , and the sampling module 13 may be used to collect a sampling signal at the sampling point S.

[0052] For example, the sampling signal may be the voltage value of the sampling point S.

[0053] For example, the first switch module 12 may include a metal-oxide-semiconductor field-effect transistor (MOSFET), a MOS tube, a relay, and the like.

[0054] In an embodiment of the present application, the first control end of the first switch module is connected to the first power supply end. When the test point is a high-voltage test point, the first power supply end may be a high-voltage power supply end, and the first reference ground may be a high-voltage ground. The first control end of the first switch module is connected to the first power supply end, and the second control end of the first switch module is connected to the enable signal end of the sampling module. The sampling module is connected to the high-voltage ground. Therefore, the sampling module is on the high-voltage side, so that the control end and the controlled end of the first switch module are both on the high-voltage side. Therefore, compared with the use of high-insulation and voltage-resistant devices, the control end and the controlled end of the first switch module help to reduce the cost of the signal sampling circuit.

[0055] In some optional embodiments, as shown in FIG2 to FIG6 , the signal sampling circuit 10 may further include a second switch module 14. The second switch module 14 may be connected between the second control terminal of the first switch module 12 and the first reference ground HV-GND. The control terminal of the second switch module 14 may be connected to the enable signal terminal EN2. The second switch module 14 may be configured to be turned on or off under the control of a control signal provided by the enable signal terminal EN2, thereby controlling the on or off of the first switch module 12. In this way, if the control signal provided by the enable signal terminal EN2 is unable to drive the first switch module 12 to be turned on or off, the control signal provided by the enable signal terminal EN2 may be used to drive the second switch module 14 to be turned on or off, thereby controlling the on or off of the first switch module 12, thereby improving the driving capability of the signal sampling circuit 10.

[0056] In some optional embodiments, as shown in FIG3 , the first voltage divider module 11 may include a voltage divider submodule 111, which may be provided with a sampling point S. The first switch module 12 may include a relay K2, which may include a coil K21 and a contact group K22. The voltage divider submodule 111 and the contact group K22 may be connected in series between the test point HV1 and the reference signal terminal Vref of the sampling module 13. The first end of the coil K21 may be connected to the first power supply terminal VDD, and the second end of the coil K21 may be connected to the enable signal terminal EN2. In this way, the voltage is divided by the voltage divider submodule 111 and the contact group K22 of the relay K2, thereby reducing the voltage across the contact group K22 of the relay K2, thereby protecting the relay K2. Furthermore, the voltage at the second end of the coil K21 of the relay K2 is controlled by the enable signal terminal EN2, thereby controlling the conduction of the contact group K22 of the relay K2, thereby enabling the sampling module 13 to acquire the sampling signal at the sampling point S.

[0057] Optionally, the voltage divider submodule 111 may include a first resistor R1 and a second resistor R2, which may be connected in series. The sampling point S may be located between the first resistor R1 and the second resistor R2. Thus, by providing the first resistor R1 and the second resistor R2 in the voltage divider submodule 111, the voltage across one or N contact groups of the relay K2 can be reduced, thereby protecting the relay. Furthermore, the voltage across the second resistor R2 can be flexibly controlled by adjusting the number and resistance of the first resistors R1.

[0058] It should be understood that Figures 4 through 6 illustrate a signal sampling circuit 10 including two first resistors R1. In specific implementations, the number of first resistors R1 can be set based on actual conditions and is not limited herein. For example, the number of first resistors R1 can be one, three, or four. The number and resistance of first resistors R1 can be determined by the voltage at the test point HV1.

[0059] The second resistor R2 can be a sampling resistor.

[0060] As an example, as shown in FIG3 , the first switch module 12 may be connected between the first resistor R1 and the second resistor R2 .

[0061] As another example, as shown in FIG. 4 , the first switch module 12 may be connected between two first resistors R1 .

[0062] As another example, as shown in FIG5 , the first switch module 12 may be connected between the test point HV1 and the first resistor R1 .

[0063] In other optional embodiments, as shown in Figure 6, the first voltage divider module 11 may include N voltage divider sub-modules 111, and each voltage divider sub-module 111 may be provided with a sampling point S, where N may be an integer greater than or equal to 2; the first switch module 12 may include a relay K3, and the relay K3 may include a coil and N contact groups. The voltage divider sub-module 111 and the contact groups may be connected in series one by one to form N branches, one end of the N branches may be connected one by one to the N points to be measured, and the other ends of the N branches may all be connected to the reference signal terminal Vref, the first end of the coil K31 may be connected to the first power supply terminal VDD, and the second end of the coil K31 may be connected to the enable signal terminal EN2.

[0064] In this way, the voltage of the N contact groups of relay K3 is reduced by the one-to-one voltage division of the N voltage-dividing submodules 111 and the N contact groups of relay K3, thereby protecting relay K3. Furthermore, the voltage-dividing submodules 111 and the contact groups are connected in series in a one-to-one correspondence to form N branches, and one end of each of the N branches is connected to each of the N test points. The voltage at the second end of coil K31 is then controlled by the enable signal terminal EN2, thereby controlling the simultaneous conduction or closure of the N contact groups. This allows the sampling module to simultaneously collect sampling signals from the N sampling points corresponding to the N test points.

[0065] Both relay K3 and relay K4 can be small relays such as signal relays.

[0066] For example, as shown in FIG6 , the first voltage divider module 11 may include two voltage divider submodules 111 , each of which may be provided with two sampling points, and two points to be measured. The relay K3 may include one coil K31 and two contact groups. For ease of explanation, the two voltage divider submodules 111 are respectively referred to as the first voltage divider submodule 111a and the second voltage divider submodule 111b , the two points to be measured are respectively referred to as the first point to be measured HV11 and the second point to be measured HV12 , the two sampling points are respectively referred to as the first sampling point S1 and the second sampling point S2 , and the two contact groups are respectively referred to as the first contact group K32 and the second contact group K33 . A first branch a1 formed by the first voltage-dividing submodule 111a and the first contact group K32 connected in series is connected between the first test point HV11 and the first sampling terminal V1 of the sampling module 13. A second branch b1 formed by the second voltage-dividing submodule 111b and the second contact group K33 connected in series is connected between the second test point HV12 and the second sampling terminal V2 of the sampling module 13. A switch K4 is connected between the first test point HV11 and the second test point HV12. The first test point HV11 is connected to the positive electrode of the battery pack BAT under test.

[0067] When the switch K4 and the first switch module 12 are both on, the first branch a1 and the second branch a2 are both on, and the sampling module 13 can collect the first sampling signal at the first sampling point S1 and the second sampling signal at the second sampling point S2. When the switch K4 and the first switch module 12 are both off, the first branch a1 and the second branch a2 are both off, and the sampling module 13 cannot collect the first sampling signal at the first sampling point S1 and the second sampling signal at the second sampling point S2. When the switch K4 is off and the first switch module 12 is on, the first branch a1 is on and the second branch a2 is off, and the sampling module 13 can collect the first sampling signal at the first sampling point S1 and the second sampling signal at the second sampling point S2. When the switch K4 is on and the first switch module 12 is off, the first branch a1 and the second branch a2 are both off, and the sampling module 13 cannot collect the first sampling signal at the first sampling point S1 and the second sampling signal at the second sampling point S2.

[0068] The switch K4 may be a relay.

[0069] Optionally, the second switch module 14 may include a transistor. Thus, by providing the transistor in the second switch module 14, when the control signal provided by the enable signal terminal EN2 is unable to drive the first switch module 12 on or off, the control signal provided by the enable signal terminal EN2 can drive the transistor on or off, thereby controlling the first switch module 12 to be on or off, thereby improving the driving capability of the signal sampling circuit 10.

[0070] Optionally, the transistor includes a triode or a MOS transistor. Thus, by providing a triode or a MOS transistor in the second switch module 14, when the control signal provided by the enable signal terminal EN2 cannot drive the first switch module 12 to be turned on or off, the control signal provided by the enable signal terminal EN2 can drive the triode or the MOS transistor to be turned on or off, thereby controlling the first switch module 12 to be turned on or off, thereby improving the driving capability of the signal sampling circuit 10.

[0071] For example, as shown in FIG. 4 to FIG. 8 , the second switch module 14 may include an N-type MOS transistor Q2 .

[0072] In some optional embodiments, as shown in Figures 3 to 6, the signal sampling circuit 10 may further include a second voltage divider module 15. The second voltage divider module 15 may be connected between the first power supply terminal VDD and the enable signal terminal EN2. Thus, by providing the second voltage divider module 15 between the first power supply terminal VDD and the enable signal terminal EN2, the voltages on the first control terminal and the second control terminal of the first switch module 12 may be reduced, thereby protecting the first switch module 12.

[0073] Optionally, the second voltage divider module 15 may include a third resistor R3. Thus, by providing the third resistor R3 in the second voltage divider module 15, the voltages on the first control terminal and the second control terminal of the first switch module 12 can be reduced, thereby protecting the first switch module R3.

[0074] As an example, as shown in FIG4 , the third resistor R3 is connected between the N-type MOS transistor Q2 and the enable signal terminal EN2 .

[0075] As another example, as shown in FIG5 , the third resistor R3 is connected between the relay K21 and the N-type MOS transistor Q2 .

[0076] As another example, as shown in FIG6 , the third resistor R3 is connected between the relay K21 and the first power supply terminal VDD.

[0077] Based on the same inventive concept, an embodiment of the present application also provides a battery management system.

[0078] As shown in FIG7 , the battery management system 100 provided in an embodiment of the present application may include:

[0079] Controller 30;

[0080] Isolation communication module 20;

[0081] As for the signal sampling circuit 10 in any of the above embodiments, the sampling module 13 in the signal sampling circuit 10 is connected to the controller 30 through the isolation communication module 20 .

[0082] For example, the controller 30 may be configured to:

[0083] Sending a sampling instruction to the sampling module 13 through the isolated communication module 20, the sampling instruction is used to instruct the sampling module 13 to collect a sampling signal and transmit the sampling signal to the controller 30 through the isolated communication module 20;

[0084] Receive the sampled signal.

[0085] In an embodiment of the present application, the controller 30 sends a sampling instruction to the sampling module 13 through the isolated communication module 20, so that the sampling module 13 collects the sampling signal, and transmits the sampling signal to the controller 30 through the isolated communication module 20, and receives the sampling signal, which helps the controller 30 calculate the voltage of the test point HV1 based on the sampling signal.

[0086] For example, the controller 30 may include a microcontroller unit (MCU). The isolated communication module 20 may include an isolated communication chip. The isolated communication module 20 may send a sampling instruction to the sampling module 13 via a serial peripheral interface (SPI), an integrated circuit (I2C), a universal asynchronous receiver / transmitter (UART), or a daisy chain.

[0087] For example, the controller 30 may be connected to a second reference ground LV-GND. The second reference ground LV-GND may be the earth. In other words, the second reference ground LV-GND may be a low voltage ground.

[0088] For example, taking the case where there are two first resistors R1, the voltage U at the test point HV1 can satisfy the formula (1). U = (v1-vref)*(2r1+r2) / r2 Formula (1)

[0089] Wherein, v1 represents the sampling voltage at the sampling point S; vref represents the voltage of the reference signal terminal Vref in the sampling module 13; r1 represents the resistance value of the first resistor R1; and r2 represents the resistance value of the second resistor R2.

[0090] It is understandable that the values ​​of v1, vref, r1 and r2 are all known. Substituting the values ​​of v1, vref, r1 and r2 into formula (1), U can be calculated.

[0091] It should be noted that formula (1) takes the number of the first resistors R1 as an example. If the number of the first resistors R1 is N, where N is a positive integer, then “2r1” in formula (1) is “N×r1”.

[0092] It can be understood that the battery management system has the beneficial effects of the signal sampling circuit provided in the embodiments of the present application. For details, please refer to the specific description of the signal sampling circuit in the above embodiments, which will not be repeated in this embodiment.

[0093] Based on the same inventive concept, as shown in FIG8 , an embodiment of the present application further provides a battery system. The battery system 1000 may include a battery 200 and a battery management system 100. The battery management system 100 may include the signal sampling circuit of any of the above embodiments. It is understood that the battery system has the beneficial effects of the signal sampling circuit provided in the embodiments of the present application. For details, please refer to the detailed description of the signal sampling circuit in the above embodiments, and this embodiment will not be repeated here.

[0094] Based on the same inventive concept, as shown in FIG9 , the present application further provides an electric device. The electric device 2000 may include a battery management system 100, which includes the signal sampling circuit of any of the above embodiments. It is understood that the electric device has the beneficial effects of the signal sampling circuit provided in the embodiments of the present application. For details, please refer to the detailed description of the signal sampling circuit in the above embodiments, and this embodiment will not be repeated here.

[0095] It should be noted that in the embodiments shown in the above figures, the resistor is shown as a single resistor. In other embodiments, the resistor may be an integration of series, parallel, or mixed resistors. The specific parameters of each device can be set according to actual needs and are not limited in this application.

[0096] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0097] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A signal sampling circuit, comprising a first voltage dividing module, a first switch module and a sampling module; wherein: The first voltage divider module and the first switch module are connected in series between the point to be measured and the reference signal terminal of the sampling module, the first control terminal of the first switch module is connected to the first power supply terminal, the second control terminal of the first switch module is connected to the enable signal terminal of the sampling module, and the sampling module is connected to the first reference ground; The first voltage divider module is provided with a sampling point, and the sampling module is used to collect a sampling signal at the sampling point.

2. The signal sampling circuit according to claim 1, wherein: The signal sampling circuit also includes a second switch module, which is connected between the second control end of the first switch module and the first reference ground, and the control end of the second switch module is connected to the enable signal end. The second switch module is used to turn on or off under the control of the control signal provided by the enable signal end, thereby controlling the first switch module to turn on or off.

3. The signal sampling circuit according to claim 1, wherein: The signal sampling circuit further includes a second voltage dividing module, and the second voltage dividing module is connected between the first power supply terminal and the enable signal terminal.

4. The signal sampling circuit according to claim 1, wherein: The first voltage division module includes a voltage division submodule, and the voltage division submodule is provided with a sampling point; The first switch module includes a relay, and the relay includes a coil and a contact group. The voltage divider module and the contact group are connected in series between the point to be measured and the reference signal end of the sampling module. The first end of the coil is connected to the first power supply end, and the second end of the coil is connected to the enable signal end.

5. The signal sampling circuit according to claim 1, wherein: The first voltage division module includes N voltage division sub-modules, each of which is provided with a sampling point, wherein N is an integer greater than or equal to 2; The first switch module includes a relay, the relay includes a coil and N contact groups, the voltage divider module and the contact groups are connected in series one by one to form N branches, one end of the N branches is connected to the N points to be tested one by one, and the other end of the N branches is connected to the With reference to the signal terminal, the first terminal of the coil is connected to the first power terminal, and the second terminal of the coil is connected to the enable signal terminal.

6. The signal sampling circuit according to claim 2, wherein: The second switch module includes a transistor.

7. The signal sampling circuit according to claim 6, wherein: The transistor includes a triode or a MOS tube.

8. The signal sampling circuit according to claim 4 or 5, wherein: The voltage divider module includes a first resistor and a second resistor, the first resistor and the second resistor are connected in series, and the sampling point is arranged between the first resistor and the second resistor.

9. The signal sampling circuit according to claim 3, wherein: The second voltage dividing module includes a third resistor.

10. A battery management system, comprising: Controller; Isolate communication module; And the signal sampling circuit according to any one of claims 1 to 9, wherein the sampling module in the signal sampling circuit is connected to the controller through the isolation communication module.

11. A battery system comprising a battery and the battery management system according to claim 10.

12. An electrical device comprising the battery management system according to claim 10.

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