Battery detection apparatus and detection method

Abstract

Embodiments of the present application provide a battery detection apparatus and detection method. The battery detection apparatus comprises: a first sampling circuit, connected to a collection chip; a second sampling circuit, connected to the collection chip; the collection chip, used for collecting a first sampled signal by means of the first sampling circuit, and collecting a second sampled signal by means of the second sampling circuit; and a processing module, communicatively connected to the collection chip, used for receiving the first sampled signal collected by the collection chip, so as to detect the voltage of a battery, and used for receiving the first sampled signal and the second sampled signal collected by the collection chip, so as to perform insulation detection on the battery. The battery detection apparatus and detection method provided in the embodiments of the present application can simplify the design of the battery detection apparatus.

Description

Battery testing device and testing method Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202510368597.3, filed on March 26, 2025, entitled “Battery Testing Apparatus and Testing Method”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a battery testing device and testing method. Background Technology

[0003] During battery use, voltage sampling, insulation sampling, current sampling, and other methods are required to monitor the battery's status, thereby enabling more rational control of battery charging and discharging, energy storage system operation, and improving the stability and reliability of the energy storage system.

[0004] Currently, battery sampling designs are quite complex, requiring numerous functional modules, which increases hardware costs and circuit board space. Furthermore, this leads to complex sampling communication logic within the battery management system, increasing the complexity of software development and debugging. Summary of the Invention

[0005] This application provides a battery testing device and a testing method, which can simplify the design of the battery testing device.

[0006] In a first aspect, a battery testing device is provided, comprising: a first sampling circuit connected to a data acquisition chip; a second sampling circuit connected to the data acquisition chip; a data acquisition chip that acquires a first sampling signal through the first sampling circuit and acquires a second sampling signal through the second sampling circuit; and a processing module that is communicatively connected to the data acquisition chip, for receiving the first sampling signal acquired by the data acquisition chip to detect the voltage of the battery, and for receiving the first and second sampling signals acquired by the data acquisition chip to perform insulation testing on the battery.

[0007] In this embodiment, the processing unit can detect the battery voltage based on the first sampling signal acquired by the acquisition chip, and can perform insulation detection on the battery based on the first and second sampling signals acquired by the acquisition chip. The acquisition chip can only play the role of information transmission, without the need to program the acquisition chip with programs such as insulation detection and voltage detection, which simplifies the program programming process. The battery insulation detection depends on the first and second sampling signals, that is, some of the data required for insulation detection can come from the sampling data of voltage detection, thereby simplifying the design of the battery detection device, such as circuit design and communication design.

[0008] In one possible implementation, the two ends of the first sampling circuit are connected to the positive and negative terminals of the battery, respectively, and the first sampling circuit includes multiple voltage divider resistors.

[0009] In this embodiment, the first sampling circuit, which includes multiple voltage divider resistors, can be connected to the positive and negative terminals of the battery respectively. This facilitates the acquisition of the first sampling signal from the first sampling circuit acquired by the chip, thereby making it easier to determine the voltage between the positive and negative terminals of the battery based on the first sampling signal.

[0010] In one possible implementation, the second sampling circuit includes a first sampling branch and a second sampling branch. The first sampling branch includes at least one voltage divider resistor and a first switch. The second sampling branch includes multiple voltage divider resistors. One end of the first sampling branch is connected to the positive terminal of the battery, and one end of the second sampling branch is connected to the negative terminal of the battery. The other ends of the first sampling branch and the other ends of the second sampling branch are interconnected and connected to a reference ground.

[0011] In this embodiment, the second sampling circuit includes a first sampling branch disposed between the positive terminal of the battery and a reference ground, and a second sampling branch disposed between the negative terminal of the battery and the reference ground. The first sampling branch includes at least one voltage-dividing resistor and a first switch, and the second sampling branch includes multiple voltage-dividing resistors. This allows for the acquisition of two sets of second acquisition signals corresponding to the on / off states of the first switch, facilitating battery insulation detection and simplifying the overall circuit design for battery voltage and insulation detection.

[0012] On the other hand, the first switch can also be in the open state after the insulation test is completed, thereby disconnecting the first sampling branch and saving energy.

[0013] In one possible implementation, at least one voltage divider resistor and a first switch in the first sampling branch are connected in series.

[0014] In this embodiment of the application, by setting at least one voltage divider resistor and the first switch in the first sampling branch to be connected in series, the on / off state of the first sampling branch can be switched by the first switch, which facilitates the acquisition of the second sampling signal when the first sampling branch is on or off, and facilitates the insulation detection of the battery.

[0015] In one possible implementation, at least one voltage divider resistor in the first sampling branch includes a third voltage divider resistor.

[0016] In this embodiment, the first sampling branch may include a third voltage divider resistor and a first switch connected in series. The design of the first sampling branch can be simplified by adjusting the number of voltage divider resistors in the first sampling branch.

[0017] In one possible implementation, the first switch is connected to a data acquisition chip, which controls the on / off state of the first switch.

[0018] In this embodiment, the first switch is connected to the acquisition chip, and the on / off state of the first switch is controlled by the port of the acquisition chip, such as the IO port. This integrates the switching function of the first switch into the acquisition chip, eliminating the need to introduce other components such as chips to drive the switch and simplifying the circuit design.

[0019] In one possible implementation, the first switch includes a MOSFET.

[0020] In this embodiment, a MOSFET is selected as the switch because it has the advantages of fast response speed and long lifespan. During insulation detection, it can switch rapidly at high frequency, thus meeting the detection requirements of the insulation detection circuit. Furthermore, selecting a MOSFET as the first switch facilitates the acquisition chip's control over the on / off state of the first switch.

[0021] In one possible implementation, multiple voltage divider resistors in the second sampling branch are connected in series, and the multiple voltage divider resistors in the second sampling branch include a fourth voltage divider resistor. The two ends of the fourth voltage divider resistor are respectively set with second sampling points, which are connected to the acquisition chip for acquiring the second sampling signal.

[0022] In this embodiment of the application, by setting a second sampling point at both ends of the fourth voltage divider resistor among the multiple voltage divider resistors connected in series in the second sampling branch, the acquisition chip can collect the voltage (second sampling signal) at both ends of the fourth voltage divider resistor, thereby enabling insulation detection of the battery based on the second sampling signal.

[0023] On the other hand, by using the fourth voltage divider resistor in the second sampling branch as the sampling resistor, the voltage across the fourth voltage divider resistor can be directly acquired using the acquisition chip. There is no need to design an isolation sampling circuit between the acquisition chip and the second sampling point, which simplifies the design of the second sampling circuit.

[0024] In one possible implementation, the multiple voltage divider resistors in the second sampling branch also include a fifth voltage divider resistor.

[0025] In this embodiment, a fourth and a fifth voltage-dividing resistor connected in series are provided in the second sampling branch. This enables voltage division between the battery negative terminal and the reference ground, as well as the acquisition of the voltage signal after voltage division, facilitating insulation testing of the battery. Furthermore, the number of voltage-dividing resistors in the second sampling branch is set to two, reducing the overall number of resistors and simplifying the design of the second sampling branch.

[0026] In one possible implementation, the second sampling branch also includes a second switch, which is connected in series with multiple voltage divider resistors in the second sampling branch.

[0027] In this embodiment, by setting a second switch in the second sampling branch and connecting the second switch in series with multiple voltage divider resistors in the second sampling branch, the on / off state of the second sampling branch is controlled by the on / off state of the second switch, so that the second switch is turned on to perform insulation detection during insulation detection and turned off to disconnect the second switch after the insulation detection is completed, which can save energy consumption.

[0028] In one possible implementation, the second switch is connected to the acquisition chip, which controls the on / off state of the second switch.

[0029] In this embodiment, the second switch is connected to the acquisition chip, and the on / off state of the second switch is controlled by the port of the acquisition chip, such as the IO port. This integrates the on / off switching function of the second switch into the acquisition chip, eliminating the need to introduce other components such as chips to drive the on / off state of the switch, thus simplifying the circuit design.

[0030] In one possible implementation, the second switch includes a MOSFET or a relay.

[0031] In one possible implementation, the first sampling branch further includes a third switch, at least one voltage divider resistor in the first sampling branch, the first switch and the third switch are connected in series, and the third switch is located at the end of the first sampling branch near the positive terminal of the battery, wherein the withstand voltage of the third switch is greater than or equal to the first withstand voltage test voltage of the first sampling branch, and the withstand voltage of the first switch is less than the first withstand voltage test voltage.

[0032] In this embodiment, by setting a third switch with a withstand voltage value greater than or equal to the withstand voltage test voltage of the first sampling branch at the end of the first sampling branch near the positive terminal of the battery, the third switch can withstand the withstand voltage test voltage during the withstand voltage test, which can reduce the situation where high voltage is directly applied to the first switch and reduce the risk of the first switch being broken down.

[0033] In one possible implementation, the third switch includes a relay.

[0034] In this embodiment, since the relay has a relatively high withstand voltage, selecting the relay as the third switch can help withstand the battery withstand voltage test voltage when the second switch, such as the MOSFET, cannot withstand the voltage of the battery withstand voltage test, thereby reducing the possibility of damage to the switching element.

[0035] In one possible implementation, the third switch is connected to the acquisition chip, which controls the on / off state of the third switch.

[0036] In this embodiment, a third switch is connected to the acquisition chip, and the on / off state of the third switch is controlled by the I / O port of the acquisition chip. This integrates the on / off switching function of the third switch into the acquisition chip, eliminating the need for other components such as chips to drive the switch and simplifying circuit design.

[0037] In one possible implementation, the battery detection device further includes: a third sampling circuit connected to the acquisition chip, wherein the acquisition chip acquires a third sampling signal through the third sampling circuit, so that the processing module receives the first sampling signal and the third sampling signal acquired by the acquisition chip to detect the positive terminal switch module of the battery, wherein the positive terminal switch module is connected to the positive terminal of the battery.

[0038] In this embodiment of the application, by setting a third sampling circuit and connecting the third sampling circuit to the acquisition chip, the positive terminal switch module of the battery can be detected based on the first sampling signal and the third sampling signal.

[0039] In one possible implementation, the two ends of the third sampling circuit are connected to the end of the positive switch module away from the positive terminal of the battery and the negative terminal of the battery, respectively. The third sampling circuit includes multiple voltage divider resistors.

[0040] In this embodiment, the two ends of the third sampling circuit, which includes multiple voltage divider resistors, can be connected to the end of the positive switch module away from the positive terminal of the battery and the negative terminal of the battery, respectively. This facilitates the acquisition of the third sampling signal of the third sampling circuit acquired by the chip, thereby facilitating the detection of the positive switch module of the battery based on the third sampling signal.

[0041] In one possible implementation, multiple voltage divider resistors in the third sampling circuit are connected in series, and the multiple voltage divider resistors in the third sampling circuit include a sixth voltage divider resistor. The two ends of the sixth voltage divider resistor are respectively set as third sampling points, and the third sampling points are connected to the acquisition chip for acquiring the third sampling signal.

[0042] In this embodiment, by setting a third sampling point at both ends of the sixth voltage divider resistor among the multiple voltage divider resistors connected in series in the third sampling circuit, the acquisition chip can collect the voltage (first sampling signal) at both ends of the sixth voltage divider resistor, thereby enabling the detection of the positive terminal switch module of the battery based on the third sampling signal.

[0043] In one possible implementation, the multiple phase voltage divider resistors in the third sampling circuit also include a seventh voltage divider resistor.

[0044] In this embodiment, a sixth and a seventh voltage-dividing resistor connected in series are included in the third sampling circuit. This allows for voltage division between the positive switching module and the negative terminal of the battery, as well as the acquisition of the voltage signal after division. This enables the determination of the voltage between the positive switching module and the negative terminal of the battery, facilitating the detection of the positive switching module. Furthermore, using two voltage-dividing resistors reduces the overall number of resistors and simplifies the design of the third sampling circuit.

[0045] In one possible implementation, the battery detection device further includes a fourth sampling circuit connected to the acquisition chip. The acquisition chip acquires a fourth sampling signal through the fourth sampling circuit, so that the processing module can detect the charging and discharging current of the battery through the fourth sampling signal acquired by the acquisition chip.

[0046] In this embodiment of the application, by connecting the sample chip to the fourth sampling circuit of the battery, the charging and discharging current of the battery can be detected, and the acquisition chip can acquire the first sampling signal, the second sampling signal and the fourth sampling signal. It can realize the functions of voltage sampling, insulation sampling and current sampling in one acquisition chip, which can reduce the number of components in the battery detection device and simplify the design of the battery detection device.

[0047] Secondly, a battery detection method is provided, comprising: acquiring a first sampling signal of a first sampling circuit acquired by an acquisition chip, wherein the acquisition chip is connected to the first sampling circuit; acquiring a second sampling signal of a second sampling circuit acquired by the acquisition chip, wherein the acquisition chip is connected to the second sampling circuit; detecting the voltage of the battery based on the first sampling signal; and performing insulation detection on the battery based on the first sampling signal and the second sampling signal.

[0048] In one possible implementation, the two ends of the first sampling circuit are connected to the positive and negative terminals of the battery, respectively, and the first sampling circuit includes multiple voltage divider resistors.

[0049] In one possible implementation, multiple voltage divider resistors in the first sampling circuit are connected in series, and the multiple voltage divider resistors in the first sampling circuit include a first voltage divider resistor. A first sampling point is set at both ends of the first voltage divider resistor, and the first sampling point is connected to the acquisition chip for acquiring the first sampling signal.

[0050] In one possible implementation, the multiple voltage divider resistors in the first sampling circuit also include a second voltage divider resistor.

[0051] In one possible implementation, the second sampling circuit includes a first sampling branch and a second sampling branch. The first sampling branch includes at least one voltage divider resistor and a first switch. The second sampling branch includes multiple voltage divider resistors. One end of the first sampling branch is connected to the positive terminal of the battery, and one end of the second sampling branch is connected to the negative terminal of the battery. The other ends of the first sampling branch and the other ends of the second sampling branch are interconnected and connected to a reference ground.

[0052] In one possible implementation, at least one voltage divider resistor and a first switch in the first sampling branch are connected in series.

[0053] In one possible implementation, at least one voltage divider resistor in the first sampling branch includes a third voltage divider resistor.

[0054] In one possible implementation, the first switch is connected to a data acquisition chip, which controls the on / off state of the first switch.

[0055] In one possible implementation, the first switch includes a MOSFET.

[0056] In one possible implementation, multiple voltage divider resistors in the second sampling branch are connected in series, and the multiple voltage divider resistors in the second sampling branch include a fourth voltage divider resistor. The two ends of the fourth voltage divider resistor are respectively set with second sampling points, which are connected to the acquisition chip for acquiring the second sampling signal.

[0057] In one possible implementation, the multiple voltage divider resistors in the second sampling branch also include a fifth voltage divider resistor.

[0058] In one possible implementation, before acquiring the first sampling signal from the first sampling circuit acquired by the acquisition chip and the second sampling signal from the second sampling circuit acquired by the acquisition chip, the battery detection method further includes: controlling a first switch to switch between an on state and an off state via the acquisition chip; acquiring the first sampling signal from the first sampling circuit acquired by the acquisition chip and the second sampling signal from the second sampling circuit acquired by the acquisition chip, including: acquiring the first sampling signal and the second sampling signal when the first switch is in the on state; and acquiring the first sampling signal and the second sampling signal when the first switch is in the off state.

[0059] In one possible implementation, insulation detection of the battery is performed based on a first sampling signal and a second sampling signal, including: performing insulation detection of the battery based on a first sampling signal and a second sampling signal when the first switch is in a conducting state, and on a first sampling signal and a second sampling signal when the first switch is in a de-energized state.

[0060] In one possible implementation, insulation detection of the battery is performed based on a first sampling signal and a second sampling signal when the first switch is in the on state, and a first sampling signal and a second sampling signal when the first switch is in the off state. This includes determining a first insulation resistance of the battery's positive terminal to a reference ground and a second insulation resistance of the battery's negative terminal to a reference ground based on the first sampling signal and the second sampling signal when the first switch is in the on state, the first sampling signal and the second sampling signal when the first switch is in the off state, the resistance values ​​of a plurality of voltage divider resistors in the first sampling circuit, and the resistance values ​​of a plurality of voltage divider resistors in the second sampling circuit.

[0061] In one possible implementation, the second sampling branch also includes a second switch, which is connected in series with multiple voltage divider resistors in the second sampling branch.

[0062] In one possible implementation, the second switch is connected to the acquisition chip, which controls the on / off state of the second switch.

[0063] In one possible implementation, the second switch includes a MOSFET or a relay.

[0064] In one possible implementation, before acquiring the first sampling signal from the first sampling circuit acquired by the acquisition chip and the second sampling signal from the second sampling circuit acquired by the acquisition chip, the battery detection method further includes: controlling the first switch to switch between an on state and an off state via the acquisition chip, and controlling the second switch to be in an on state via the acquisition chip; acquiring the first sampling signal from the first sampling circuit acquired by the acquisition chip and acquiring the second sampling signal from the second sampling circuit acquired by the acquisition chip includes: acquiring the first sampling signal and the second sampling signal when both the first switch and the second switch are in an on state; and acquiring the first sampling signal and the second sampling signal when the first switch is in an off state and the second switch is in an on state.

[0065] In one possible implementation, insulation detection of the battery is performed based on a first sampling signal and a second sampling signal, including: performing insulation detection of the battery based on a first sampling signal and a second sampling signal when the first switch and the second switch are in a conducting state, and a first sampling signal and a second sampling signal when the first switch is in a deflected state and the second switch is in a conducting state.

[0066] In one possible implementation, insulation detection of the battery is performed based on the first and second sampling signals when the first and second switches are in the ON state, and the first and second sampling signals when the first switch is in the OFF state and the second switch is in the ON state. This includes determining the first insulation resistance of the battery's positive terminal to the reference ground and the second insulation resistance of the battery's negative terminal to the reference ground based on the first and second sampling signals when the first and second switches are in the ON state, the first and second sampling signals when the first switch is in the OFF state and the second switch is in the ON state, the resistance values ​​of multiple voltage divider resistors in the first sampling circuit, and the resistance values ​​of multiple voltage divider resistors in the second sampling circuit.

[0067] In one possible implementation, the first sampling branch further includes a third switch, at least one voltage divider resistor in the first sampling branch, the first switch and the third switch are connected in series, and the third switch is located at the end of the first sampling branch closer to the positive terminal of the battery, wherein the withstand voltage of the third switch is greater than or equal to the first withstand voltage test voltage of the first sampling branch, and the withstand voltage of the first switch is less than the first withstand voltage test voltage.

[0068] In one possible implementation, the third switch includes a relay.

[0069] In one possible implementation, the third switch is connected to the acquisition chip, which controls the on / off state of the third switch.

[0070] In one possible implementation, before acquiring the first sampling signal of the first sampling circuit acquired by the acquisition chip and the second sampling signal of the second sampling circuit acquired by the acquisition chip, the battery detection method further includes: controlling the first switch to switch between an on state and an off state via the acquisition chip, and controlling the second switch and the third switch to be in an on state via the acquisition chip; acquiring the first sampling signal of the first sampling circuit acquired by the acquisition chip and the second sampling signal of the second sampling circuit acquired by the acquisition chip includes: acquiring the first sampling signal and the second sampling signal when the first switch, the second switch and the third switch are all in an on state; and acquiring the first sampling signal and the second sampling signal when the first switch is in an off state and the second switch and the third switch are both in an on state.

[0071] In one possible implementation, insulation detection of the battery is performed based on a first sampling signal and a second sampling signal, including: performing insulation detection of the battery based on a first sampling signal and a second sampling signal when the first switch, the second switch, and the third switch are all in the on state, and on a first sampling signal and a second sampling signal when the first switch is in the off state and the second switch and the third switch are in the on state.

[0072] In one possible implementation, insulation detection of the battery includes: determining the first insulation resistance of the battery's positive terminal to a reference ground and the second insulation resistance of the battery's negative terminal to a reference ground based on the first and second sampling signals when the first, second, and third switches are all in the ON state, the first and second sampling signals when the first switch is in the OFF state and the second and third switches are in the ON state, the resistance values ​​of multiple voltage divider resistors in the first sampling circuit, and the resistance values ​​of multiple voltage divider resistors in the second sampling circuit.

[0073] Thirdly, a battery management system is provided, which includes a battery detection device as described in the first aspect or any possible implementation thereof.

[0074] Fourthly, an energy storage device is provided, comprising a battery and a battery detection device as described in the first aspect or any possible implementation thereof. Attached Figure Description

[0075] Figure 1 is a schematic diagram of the battery detection device provided in an embodiment of this application.

[0076] Figure 2 is a schematic diagram of the battery detection device provided in an embodiment of this application.

[0077] Figure 3 is a schematic diagram of the battery detection device provided in an embodiment of this application.

[0078] Figure 4 is a schematic diagram of the battery detection device provided in an embodiment of this application.

[0079] Figure 5 is a schematic diagram of the battery testing device provided in the embodiment of this application.

[0080] Figure 6 is a schematic diagram of the battery detection device provided in an embodiment of this application.

[0081] Figure 7 is a schematic flowchart of the battery detection method provided in the embodiments of this application.

[0082] Figure 8 is a flowchart illustrating the battery detection method provided in an embodiment of this application.

[0083] Figure 9 is a flowchart illustrating the battery detection method provided in an embodiment of this application.

[0084] Figure 10 is a schematic flowchart of the battery detection method provided in the embodiments of this application.

[0085] Reference numerals: Battery Management System: 10, First Sampling Circuit: 11, Second Sampling Circuit: 12, Acquisition Chip: 13, Processing Module: 14, Fourth Sampling Circuit: 15, Power Module: 16, Third Sampling Circuit: 17, First Sampling Branch: 121, Second Sampling Branch: 122, First Voltage Divider Resistor: R1, Second Voltage Divider Resistor: R2, Third Voltage Divider Resistor: R3, Fourth Voltage Divider Resistor: R4, Fifth Voltage Divider Resistor: R5, Sixth Voltage Divider Resistor: R6, Seventh Voltage Divider Resistor: R7, First Switch: K1, Second Switch: K2, Third Switch: K3, First Current Sampling Sample Branch: 151, Second Current Sampling Branch: 152, Third Current Sampling Branch: 153, Fourth Current Sampling Branch: 154, Fifth Current Sampling Branch: 155, Sixth Current Sampling Branch: 156, Seventh Current Sampling Branch: 157, First Inductor: L1, Second Inductor: L2, Third Inductor: L3, First Capacitor: C1, Second Capacitor: C2, Third Capacitor: C3, Fourth Capacitor: C4, Battery: 20, Current Sampling Resistor: 23, Positive Switch Module: 24, First Insulation Resistance: Rp, Second Insulation Resistance: Rn, Reference Ground: GND. Detailed Implementation

[0086] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0087] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings of this application, are intended to cover non-exclusive inclusion.

[0088] The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this text generally indicates that the preceding and following related objects have an "or" relationship.

[0089] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0090] In this application, the terms "upper," "lower," "left," "right," "inner," and "outer," indicating orientation or positional relationships, are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0091] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0092] During battery use, voltage sampling, insulation sampling, current sampling, and other methods are required to monitor the battery's status, thereby enabling more rational control of battery charging and discharging, energy storage system operation, and improving the stability and reliability of the energy storage system.

[0093] Currently, battery sampling designs are quite complex, requiring numerous functional modules, which increases hardware costs and circuit board space. Furthermore, it complicates the sampling communication logic within the battery management system (BMS), increasing the complexity of software development and debugging.

[0094] To address the aforementioned issues, this application provides a battery testing device, comprising: a first sampling circuit connected to a data acquisition chip; a second sampling circuit connected to the data acquisition chip; the data acquisition chip acquiring a first sampling signal through the first sampling circuit and acquiring a second sampling signal through the second sampling circuit; and a processing module communicatively connected to the data acquisition chip, configured to receive the first sampling signal acquired by the data acquisition chip to detect the voltage of the battery, and to receive the first sampling signal and the second sampling signal acquired by the data acquisition chip to perform insulation testing on the battery.

[0095] The battery management system provided in this application simplifies circuit design.

[0096] A battery can refer to a structure composed of multiple individual battery cells that can be connected in series, parallel, or in a mixed configuration. A mixed configuration refers to a combination of series and parallel connections. Multiple individual battery cells can be directly assembled into a battery, or they can first be assembled into a battery module, and then the battery module can be assembled into a battery. For example, multiple individual battery cells can first be connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed configuration to form a battery.

[0097] Battery cells can include lithium-ion rechargeable battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and this application embodiment is not limited to these. Battery cells can be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited to these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells, and this application embodiment is not limited to these.

[0098] The battery provided in this application can be used in energy storage systems, electric vehicles, or other devices, such as mobile phones, portable devices, laptops, electric toys, power tools, ships, and spacecraft. Spacecraft include, for example, airplanes, rockets, space shuttles, and spacecraft. It should be understood that the technical solutions described in this application are not limited to the devices described above, but can also be applied to other devices that use batteries.

[0099] The battery testing device provided in the embodiments of this application will be described exemplarily below with reference to Figures 1 to 6.

[0100] Figure 1 is a schematic diagram of the battery detection device 10 provided in an embodiment of this application.

[0101] The battery testing device 10 includes a first sampling circuit 11, a second sampling circuit 12, a data acquisition chip 13, and a processing module 14.

[0102] The first sampling circuit 11 is connected to the acquisition chip 13.

[0103] The second sampling circuit 12 is connected to the acquisition chip 13.

[0104] The first sampling signal is acquired through the first sampling circuit 11, and the second sampling signal is acquired through the second sampling circuit 12.

[0105] The processing module 14 is communicatively connected to the acquisition chip 13 and is used to receive the first sampling signal acquired by the acquisition chip 13 to detect the voltage of the battery, and to receive the first sampling signal and the second sampling signal acquired by the acquisition chip 13 to perform insulation detection on the battery.

[0106] The purpose of voltage detection is to determine the battery voltage, such as the voltage across the positive and negative terminals. As an example, a resistor can be set on the first sampling circuit 11 to divide the voltage between the positive and negative terminals of the battery. The voltage value across the resistor (first sampling signal) is acquired by the acquisition chip 13. Then, based on this voltage value and the resistance value on the first sampling circuit 11, the total voltage between the positive and negative terminals of the battery is calculated.

[0107] The acquisition chip 13 can acquire a first sampling signal on the first sampling circuit 11, such as the voltage across a voltage divider resistor, and then transmit the first sampling signal to the processing module 14. The processing module 14 can determine the voltage between the positive and negative terminals of the battery based on the first sampling signal.

[0108] The purpose of battery insulation testing is to check whether the battery's positive and negative terminals are connected to the BMS casing's "reference ground (GND)" and whether there is a risk of leakage. Simply put, battery insulation testing measures the resistance between the battery's positive and negative terminals and the reference ground (GND) to determine if the battery is leaking. Therefore, theoretically, the insulation resistance between the battery's positive and negative terminals and the reference ground (GND), such as in vehicle chassis or energy storage cabinet housings, should be infinite (∞).

[0109] As an example, for energy storage cabinets, insulation testing of the batteries involves determining the insulation resistance of the positive and negative terminals of the batteries to the cabinet's casing. As another example, for electric vehicles, insulation sampling of the batteries involves determining the insulation resistance of the positive and negative terminals of the batteries to the vehicle chassis.

[0110] The acquisition chip 13 can acquire a first sampling signal on the first sampling circuit 11, such as the voltage across a voltage divider resistor, and the acquisition chip 13 can acquire a second sampling signal on the second sampling circuit 12, such as the voltage across a voltage divider resistor. Then, the first sampling signal and the second sampling signal are transmitted to the processing module 14. The processing module 14 can determine the insulation resistance of the battery positive terminal to the reference ground GND and the insulation resistance of the battery negative terminal to the reference ground GND based on the first sampling signal and the second sampling signal.

[0111] In this embodiment, voltage detection and insulation detection can be performed simultaneously or separately. For example, the acquisition chip 13 can acquire a first sampling signal from the first sampling circuit 11 and a second sampling signal from the second sampling circuit 12, and send the first and second sampling signals to the processing module 14. The processing module 14 performs voltage detection and insulation detection simultaneously based on the received first and second sampling signals. As another example, the acquisition chip 13 can acquire a first sampling signal from the first sampling circuit 11 and then send this first sampling signal to the processing module 14. The processing module 14 can perform voltage detection on the battery based on the first sampling signal. After voltage detection is completed, the acquisition chip can acquire the first sampling signal from the first sampling circuit 11 and the second sampling signal from the second sampling circuit 12, and then send these first and second sampling signals to the processing module 14. The processing module 14 can perform insulation detection on the battery based on these first and second sampling signals.

[0112] That is, the acquisition chip 13 is connected to the first sampling circuit 11 and the second sampling circuit 12 of the battery, so that the acquisition chip 13 can acquire the first sampling signal of the first sampling circuit 11 and the second sampling signal of the second sampling circuit 12. Then the acquisition chip 13 can transmit the first sampling signal and the second sampling signal to the processing module 14 so that the processing module 14 can perform voltage detection and insulation detection on the battery.

[0113] In this embodiment, the processing module 14 can perform voltage detection on the battery based on the first sampling signal acquired by the acquisition chip 13, and can also perform insulation detection on the battery based on the first and second sampling signals acquired by the acquisition chip 13. The acquisition chip 13 can only serve the function of information transmission, without the need to program the acquisition chip 13 with programs such as insulation detection and voltage detection, thus simplifying the program programming process. The battery insulation detection depends on the first and second sampling signals; that is, some of the data required for insulation detection can come from the voltage detection data, which can reduce the sampling data of the second sampling circuit 12, thereby simplifying the circuit design and communication design of the battery detection device.

[0114] In some embodiments, the processing module 14 may be a battery management unit (BMU).

[0115] The battery management unit (BMU) is the core component of the battery management system, responsible for monitoring and managing the battery's status. The processing unit collects key parameters such as battery voltage, current, and temperature through sampling circuits and sensors connected to the battery, preventing problems like overcharging, over-discharging, and thermal runaway. In other words, besides voltage and insulation detection, the processing unit can also monitor and manage other battery parameters.

[0116] In some embodiments, the processing module 14 may be integrated with the battery management unit.

[0117] In some embodiments, the processing module 14 may also be a separate module. For example, the processing module 14 and the battery management unit may be designed separately.

[0118] In some embodiments, as shown in FIG2, the two ends of the first sampling circuit 11 are respectively connected to the positive terminal and the negative terminal of the battery 20, and the first sampling circuit 11 includes a plurality of voltage dividing resistors.

[0119] One end of the first sampling circuit 11 is connected to the positive terminal of the battery 20, and the other end is connected to the negative terminal of the battery 20. The first sampling circuit 11 can contain two voltage-dividing resistors, or it can contain more voltage-dividing resistors.

[0120] In this embodiment, the first sampling circuit 11, which includes multiple voltage divider resistors, can be connected to the positive and negative terminals of the battery 20 respectively, which facilitates the acquisition of the first sampling signal of the first sampling circuit 11 acquired by the chip 13, thereby facilitating the determination of the voltage between the positive and negative terminals of the battery 20 based on the first sampling signal.

[0121] In some embodiments, as shown in FIG2, a plurality of voltage divider resistors in the first sampling circuit 11 are connected in series and the plurality of voltage divider resistors in the first sampling circuit 11 include a first voltage divider resistor R1. A first sampling point is set at both ends of the first voltage divider resistor R1. The first sampling point is connected to the acquisition chip 13 for acquiring a first sampling signal.

[0122] The first voltage divider resistor R1 is a sampling resistor. The acquisition chip 13 can acquire the voltage signal across the first voltage divider resistor R1 and send the voltage signal to the processing module 14. The processing module 14 can determine the voltage between the positive and negative terminals of the battery 20 based on the voltage signal.

[0123] The first sampling point can be connected to the port of the acquisition chip 13, such as the ADC interface. The acquisition chip 13 can convert the analog signal of the voltage across the first voltage divider resistor R1 into a digital signal, and then transmit the digital signal to the processing module 14.

[0124] As an example, the resistance of the first voltage divider resistor R1 is r1, and the resistances of the other voltage divider resistors are r2, r3, ..., r1, r2, r3, ..., r4, r5, r6, r7, r8, r9, r1, r1, r1, r1, r1, r1, r1, r2, r1, r1, r2, r3, r1, r1, r1, r2, r1, r2, r1, r M The voltage across the first voltage divider resistor R1 acquired by the acquisition chip 13 is U. R1 The processing module 14 can calculate the voltage Ua between the positive and negative terminals of the battery 20 based on the following formula: Ua = U R1 *(r1+r2…r M ) / r1

[0125] In this embodiment of the application, by setting a first sampling point at both ends of the first voltage divider resistor R1 among the multiple voltage divider resistors connected in series in the first sampling circuit 11, the acquisition chip 13 can acquire the voltage signal at both ends of the first voltage divider resistor R1 and transmit it to the processing module 14, so that the processing module 14 can determine the voltage between the positive and negative terminals of the battery 20 based on the voltage signal.

[0126] In some embodiments, as shown in FIG2, the plurality of voltage divider resistors of the first sampling circuit 11 further include a second voltage divider resistor R2.

[0127] The fewer the number of voltage divider resistors in the first sampling circuit 11, the simpler the design of the first sampling circuit 11. Therefore, the first sampling circuit 11 can include only two voltage divider resistors.

[0128] As an example, the resistance of the first voltage divider resistor R1 is r1, the resistance of the second voltage divider resistor R2 is r2, and the voltage across the first voltage divider resistor R1 acquired by the acquisition chip 13 is U. R1 The processing module 14 can calculate the voltage Ua between the positive and negative terminals of the battery 20 based on the following formula: Ua = U R1 *(r1+r2) / r1

[0129] In this embodiment, by setting two voltage divider resistors connected in series in the first sampling circuit 11, the voltage across the battery 20 can be divided and the voltage signal after division can be measured, thereby enabling the detection of the voltage between the positive and negative terminals of the battery 20. This also reduces the number of voltage divider resistors, simplifies the design of the first sampling circuit 11, and reduces the data overhead for battery 20 voltage detection.

[0130] As an example, the resistance of the first voltage divider resistor R1 can be 80KΩ, and the resistance of the second voltage divider resistor R2 can be 8MΩ. Depending on the specific application, the resistance values ​​of the first voltage divider resistor R1 and the second voltage divider resistor R2 can be appropriately varied. Additionally, when the resistance values ​​of the voltage divider resistors change, the second voltage divider resistor R2 can also be used as a sampling resistor.

[0131] In some embodiments, as shown in FIG2, the second sampling circuit 12 includes a first sampling branch 121 and a second sampling branch 122. The first sampling branch 121 includes at least one voltage divider resistor and a first switch K1. The second sampling branch includes multiple voltage divider resistors. One end of the first sampling branch 121 is connected to the positive terminal of the battery 20, and one end of the second sampling branch 122 is connected to the negative terminal of the battery 20. The other ends of the first sampling branch 121 and the other ends of the second sampling branch 122 are interconnected and connected to the reference ground GND.

[0132] There is a first insulation resistance Rp between the positive terminal of battery 20 and the reference ground GND, and a second insulation resistance Rn between the negative terminal of battery 20 and the reference ground GND. Insulation detection involves measuring the resistance values ​​of the first insulation resistance Rp and the second insulation resistance Rn. Ideally, the resistance values ​​of both the first insulation resistance Rp and the second insulation resistance Rn are infinite.

[0133] That is, the positive terminal of battery 20 is connected to reference ground GND through a first insulation resistor Rp, and the negative terminal of battery 20 is connected to reference ground GND through a second insulation resistor Rn. Typically, it is necessary to detect the insulation resistance values ​​of the positive terminal of battery 20 relative to reference ground GND, and the insulation resistance values ​​of the negative terminal of battery 20 relative to reference ground GND; that is, it is necessary to detect the resistance values ​​of the first insulation resistor Rp and the second insulation resistor Rn.

[0134] Understandably, performing insulation testing on battery 20 requires determining two unknown parameters: the insulation resistance values ​​of the positive and negative terminals of battery 20 relative to the reference ground GND. Therefore, calculations are needed using two sets of voltage values ​​between the positive and negative terminals of battery 20 and the reference ground GND, necessitating two sampling stages. For example, in one stage of the two sampling stages, the first sampling branch 121 is in a conducting state. In the other stage, the first sampling branch 121 is in a disconnected state. That is, in one stage, the first switch K1 needs to be in a conducting state, and in the other stage, the first switch K1 needs to be in a disconnected state.

[0135] Therefore, when the first switch K1 is in the insulation detection switching state, the acquisition chip 13 can acquire the second sampling signal corresponding to the on / off state of the first switch K1.

[0136] In addition, the first switch K1 can also be disconnected after the insulation test is completed, so that the first sampling branch 121 stops working.

[0137] In this embodiment, the second sampling circuit 12 includes a first sampling branch 121 disposed between the positive terminal of the battery 20 and the reference ground GND, and a second sampling branch 122 disposed between the negative terminal of the battery 20 and the reference ground GND. The first sampling branch 121 includes at least one voltage divider resistor and a first switch K1, and the second sampling branch 122 includes multiple voltage divider resistors. Thus, two sets of second acquisition signals corresponding to the on / off states of the first switch K1 can be acquired, facilitating insulation detection of the battery 20 and simplifying the overall circuit design for voltage and insulation detection of the battery 20.

[0138] On the other hand, the first switch K1 can also be in the open state after the insulation test is completed, thereby disconnecting the first sampling branch 121 and saving energy.

[0139] In some embodiments, as shown in FIG2, at least one voltage divider resistor and the first switch K1 in the first sampling branch 121 are connected in series.

[0140] As an example, at least one voltage divider resistor includes a voltage divider resistor connected in series with the first switch K1.

[0141] As another example, at least one voltage divider resistor may include multiple voltage divider resistors connected in series with the first switch K1. It should be understood that the multiple voltage divider resistors are connected in series with each other.

[0142] In this embodiment of the application, by setting at least one voltage divider resistor in the first sampling branch 121 and the first switch K1 to be connected in series, the on / off state of the first sampling branch 121 can be switched by the first switch K1, which facilitates the acquisition of the second sampling signal corresponding to the on / off state of the first sampling branch 121, and facilitates the insulation detection of the battery 20.

[0143] In some embodiments, as shown in FIG2, at least one voltage divider resistor in the first sampling branch 121 includes a third voltage divider resistor R3.

[0144] As an example, the first sampling branch 121 includes only the third voltage divider resistor R3 and the first switch K1 connected in series.

[0145] In this embodiment, the first sampling branch 121 may include a third voltage divider resistor R3 and a first switch K1 connected in series. The number of voltage divider resistors in the first sampling branch 121 can be increased to simplify the design of the first sampling branch 121.

[0146] In some embodiments, as shown in FIG2, the first switch K1 is connected to the acquisition chip 13 and is used to control the on / off state of the first switch K1 through the acquisition chip 13.

[0147] The first switch K1 can be connected to a port of the acquisition chip, such as an I / O port, to control the on / off state of the first switch K1. For example, the first switch K1 can be driven to conduct by outputting voltage through the I / O port, such as through a relay or MOSFET.

[0148] In this embodiment, the first switch K1 is connected to the acquisition chip 13 so that the on / off state of the first switch K1 can be controlled by the port of the acquisition chip 13, such as the IO port. This realizes that the switching function of the first switch K1 is integrated into the acquisition chip 13, which eliminates the need to introduce other devices such as chips to drive the on / off state of the switch and simplifies the circuit design.

[0149] In some embodiments, the first switch K1 includes a MOSFET.

[0150] As an example, a MOSFET can include an optical MOSFET or a high-voltage MOSFET.

[0151] During insulation detection, the first switch K1 needs to control the switching between the first insulation detection circuit being open and closed; that is, the first switch K1 needs to switch between open and closed states. For example, during real-time insulation detection of battery 20, the first switch K1 needs to switch between open and closed states repeatedly at high frequency. The advantages of MOSFETs, such as fast response speed and long lifespan, can meet the usage requirements of the first switch K1.

[0152] In this embodiment, a MOSFET is selected as the switch because it has the advantages of fast response speed and long lifespan. It can switch quickly at high frequency during insulation detection, thereby meeting the detection requirements of the insulation detection circuit.

[0153] In some embodiments, the withstand voltage of the first switch K1 is greater than the first withstand voltage test voltage of the first sampling branch 121.

[0154] In addition to insulation testing, battery 20 typically undergoes a withstand voltage test before leaving the factory. During the withstand voltage test, a relatively high voltage is applied between the positive and negative terminals of battery 20. Therefore, the positive terminal of battery 20 relative to reference ground GND and the negative terminal of battery 20 relative to reference ground GND each correspond to a withstand voltage test voltage. The withstand voltage test voltage corresponding to the positive terminal of battery 20 relative to reference ground GND is the first withstand voltage test voltage of the first sampling branch 121, and the withstand voltage test voltage corresponding to the negative terminal of battery 20 relative to reference ground GND is the second withstand voltage test voltage of the second sampling branch 122.

[0155] During the withstand voltage test, the voltage applied from the positive terminal of battery 20 to the reference ground GND must not exceed the withstand voltage value of the switch used in the first sampling branch 121, such as the first switch K1. To meet the requirements of the withstand voltage test, a switch with a higher withstand voltage value can be selected, i.e., a withstand voltage value higher than the voltage applied during the withstand voltage test.

[0156] In this embodiment, by selecting a switching element with a withstand voltage value greater than the withstand voltage test voltage of the first sampling branch as the first switch K1, the first switch K1 can be prevented from being damaged when the battery 20 is subjected to withstand voltage test, thereby improving the lifespan of the insulation detection circuit.

[0157] In some embodiments, as shown in FIG2, multiple voltage divider resistors in the second sampling branch 122 are connected in series, and the multiple voltage divider resistors in the second sampling branch 122 include a fourth voltage divider resistor R4. The two ends of the fourth voltage divider resistor R4 are respectively provided with second sampling points, which are connected to the acquisition chip 13 for acquiring the second sampling signal.

[0158] The fourth voltage divider resistor R4 in the second sampling branch 122 is a sampling resistor. The acquisition chip 13 can acquire the voltage signal across the fourth voltage divider resistor R4 and send the voltage signal to the processing module 14. The processing module 14 can determine the voltage between the negative terminal of the battery 20 and the reference ground GND based on the voltage signal.

[0159] In other words, the second sampling point can be connected to the port of the acquisition chip 13, such as the ADC interface. The acquisition chip 13 can convert the analog signal of the voltage across the fourth voltage divider resistor R4 into a digital signal, and then transmit the digital signal to the processing module 14.

[0160] In this embodiment of the application, by setting a second sampling point at both ends of the fourth voltage divider resistor R4 among the multiple voltage divider resistors connected in series in the second sampling branch 122, the acquisition chip 13 can collect the voltage (second sampling signal) at both ends of the fourth voltage divider resistor R4, thereby enabling insulation detection of the battery 20 based on the second sampling signal.

[0161] On the other hand, by using the fourth voltage divider resistor R4 in the second sampling branch 122 as the sampling resistor, the voltage across the fourth voltage divider resistor R4 can be directly acquired by the acquisition chip 13. There is no need to design an isolation sampling circuit between the acquisition chip 13 and the second sampling point, which simplifies the design of the second sampling circuit 12.

[0162] In some embodiments, as shown in FIG2, the plurality of voltage divider resistors in the second sampling branch 122 further include a fifth voltage divider resistor R5.

[0163] As an example, the second sampling branch 122 may consist only of a fourth voltage divider resistor R4 and a fifth voltage divider resistor R5 connected in series, wherein the fourth voltage divider resistor R4 serves as the sampling resistor.

[0164] In this embodiment, a fourth voltage divider resistor R4 and a fifth voltage divider resistor R5 connected in series are provided in the second sampling branch 122. This enables voltage division between the negative terminal of the battery 20 and the reference ground GND, and the acquisition of the voltage signal after voltage division, facilitating insulation detection of the battery 20. Furthermore, the number of voltage divider resistors in the second sampling branch 122 is set to two, which reduces the number of voltage divider resistors in the second sampling branch and simplifies its design.

[0165] As an example, when a first switch K1 is set in the first sampling branch 121, during battery insulation detection, the first switch K1 can be controlled by the acquisition chip 13 to switch from an off state to an on state, and the first and second sampling signals when the first switch K1 is in the on state are acquired. Then, the first switch K1 can be controlled by the sampling chip 13 to switch from an on state to an off state, and the first and second sampling signals when the first switch K1 is in the off state are acquired. Finally, the battery 20 is subjected to insulation detection based on the first and second sampling signals when the first switch K1 is in the on state and the first and second sampling signals when the first switch K1 is in the off state.

[0166] A more detailed description of the insulation test of battery 20 can be found in the relevant content of the method embodiments below, but for the sake of brevity, it will not be repeated here.

[0167] In some embodiments, as shown in FIG3, the second sampling branch 122 further includes a second switch K2, which is connected in series with a plurality of voltage divider resistors in the second sampling branch 122.

[0168] As an example, the second sampling branch 122 may include a fourth voltage divider resistor R4, a fifth voltage divider resistor R5, and a second switch K2 connected in series. The fourth voltage divider resistor R4 is the sampling resistor.

[0169] During insulation testing, the second sampling branch 122 can be in a conducting state; after the insulation testing is completed, the second sampling branch 122 can be in a disconnected state. Therefore, the second switch K2 can be turned on during insulation testing and turned off when the insulation testing is completed.

[0170] In this embodiment of the application, by setting a second switch K2 in the second sampling branch 122 and connecting the second switch K2 in series with multiple voltage divider resistors in the second sampling branch 122, the on and off of the second sampling branch 122 can be controlled by the on and off of the second switch K2, so that the second switch K2 is turned on to perform insulation detection during insulation detection and turned off to disconnect the second switch K2 after the insulation detection is completed, which can save energy consumption.

[0171] In some embodiments, the second switch K2 is connected to the acquisition chip 13 and is used to control the on / off state of the second switch K2 through the acquisition chip 13.

[0172] The second switch K2 can be connected to a port of the acquisition chip 13, such as an I / O port, to control the on / off state of the second switch K2. For example, the second switch K2 can be driven to conduct by outputting voltage to the second switch K2 via the I / O port, such as through a relay or MOSFET.

[0173] In this embodiment, the second switch K2 is connected to the acquisition chip 13 so that the on / off state of the second switch K2 can be controlled through the IO port of the acquisition chip 13. This integrates the on / off switching function of the second switch K2 into the acquisition chip 13, eliminating the need to introduce other components such as chips to drive the on / off state of the switch and simplifying the circuit design.

[0174] In some embodiments, the second switch K2 includes a MOSFET or a relay.

[0175] When insulation testing begins, the second switch K2 needs to be turned on. When insulation testing is completed, the second switch K2 can be turned off. The number of times the second switch K2 is turned on and off is relatively small, and it is basically unnecessary to switch frequently between on and off.

[0176] Therefore, either a MOSFET or a relay can be chosen as the second switch K2. Regardless of which is chosen, the voltage applied during the battery 20 withstand voltage test must be considered. Generally, if the withstand voltage test voltage corresponding to the negative terminal of battery 20 to reference ground GND is relatively low, a MOSFET can be chosen as the second switch K2. If the withstand voltage test voltage corresponding to the negative terminal of battery 20 to reference ground GND is relatively high, a relay can be chosen as the second switch K2.

[0177] As an example, MOSFETs can include optical MOSFETs or high-voltage MOSFETs, etc.

[0178] As an example, relays can include dry relays or signal relays, etc.

[0179] In this embodiment, a MOSFET or a relay is selected as the second switch K2, which facilitates the control of the second switch K2 through the IO port of the acquisition chip 13.

[0180] In some embodiments, the withstand voltage of the second switch K2 is greater than the second withstand voltage test voltage of the second sampling branch 122.

[0181] As an example, when the first sampling branch 121 includes a first switch K1 and the second sampling branch 122 includes a second switch K2, during insulation detection, the first switch K1 and the second switch K2 can be turned on by the acquisition chip 13, and the first and second sampling signals can be acquired by the acquisition chip 13. Then, the first switch K1 can be turned off by the acquisition chip 13, and the first and second sampling signals can be acquired by the acquisition chip. Finally, the battery insulation can be detected based on the first and second sampling signals when both the first switch K1 and the second switch K2 are in the on state, and the first and second sampling signals when the first switch is in the off state and the second switch K2 is in the on state.

[0182] A more detailed description of the insulation test of battery 20 can be found in the relevant content of the method embodiments below, but for the sake of brevity, it will not be repeated here.

[0183] In some embodiments, as shown in FIG4, the first sampling branch 121 further includes a third switch K3. At least one voltage divider resistor in the first sampling branch 121, the first switch K1 and the third switch K3 are connected in series, and the third switch K3 is located at the end of the first sampling branch 121 near the positive terminal of the battery 20. The withstand voltage value of the third switch K3 is greater than the first withstand voltage test voltage of the first sampling branch, and the withstand voltage value of the first switch K1 is less than the first withstand voltage test voltage.

[0184] When performing insulation sampling, the first sampling branch 121 needs to switch between an on state and an off state. For example, during real-time insulation detection, the first sampling branch 121 needs to repeatedly switch between an on state and an off state.

[0185] As an example, the first switch K1 serves as a switching switch for turning the first sampling branch 121 on and off during insulation testing. It is required to have a fast response speed and long lifespan to achieve high-frequency, rapid switching between the on and off states of the first sampling branch 121, facilitating rapid sampling when the first sampling branch 121 is on or off. Therefore, a MOSFET is typically chosen as the first switch K1. The withstand voltage of the MOSFET is usually low, potentially lower than the first withstand voltage test voltage corresponding to the first sampling branch.

[0186] Therefore, if the withstand voltage of the first switch K1 is less than the first withstand voltage test voltage, a third switch K3 is also required at the end of the first sampling branch 121 near the positive terminal of the battery 20. That is, in this embodiment, the first switch K1 is set up for switching between the first sampling branch 121 being on and off during insulation testing. The third switch K3 is set up for withstand voltage testing.

[0187] As an example, the third switch K3 can be turned on during insulation testing and turned off after insulation testing is completed. The first switch K1 can be switched between being on or off during insulation testing.

[0188] As an example, the first switch K1 can be disconnected when the insulation test is completed.

[0189] In this embodiment, by setting a third switch K3 with a withstand voltage greater than the voltage of the first withstand voltage test at one end of the first sampling branch 121 near the positive terminal of the battery 20, the third switch K3 can withstand the withstand voltage test voltage during the withstand voltage test, which can reduce the situation where high voltage is directly applied to the first switch K1 and reduce the risk of the first switch K1 being broken down.

[0190] In some embodiments, the third switch K3 includes a relay.

[0191] As an example, relays include reed relays or signal relays.

[0192] Since the relay has a relatively high withstand voltage, choosing the relay as the third switch K3 can help withstand the first withstand voltage test voltage corresponding to the positive terminal of battery 20 to reference ground GND when the MOSFET cannot withstand it, thus reducing the possibility of damage to the switching element.

[0193] In this embodiment, since the relay has a relatively high withstand voltage, selecting the relay as the third switch K3 can help withstand the first withstand voltage test voltage when the first switch K1 (such as the MOSFET) cannot withstand the first withstand voltage test voltage between the positive terminal of the battery 20 and the reference ground GND, thereby reducing the possibility of damage to the switching element.

[0194] In some embodiments, the third switch K3 is connected to the acquisition chip 13 and is used to control the on / off state of the third switch K3 through the acquisition chip 13.

[0195] The third switch K3 can be connected to a port of the acquisition chip 13, such as an I / O port, to control the on / off state of the third switch K3. For example, a voltage can be output to the third switch K3 through the I / O port to drive the third switch K3 to conduct.

[0196] In this embodiment, the third switch K3 is connected to the acquisition chip 13 so that the on / off state of the third switch K3 can be controlled by the port of the acquisition chip 13, such as the IO port. This realizes the integration of the on / off switching function of the third switch K3 into the acquisition chip 13, which eliminates the need to introduce other devices such as chips to drive the on / off state of the switch and simplifies the circuit design.

[0197] As an example, when the first sampling branch 121 includes a first switch K1 and a third switch K3, and the second sampling branch includes a second switch K2, during detection, the acquisition chip 13 can first control the first switch K1, the second switch K2, and the third switch K3 to all be in the ON state, and the acquisition chip 13 can acquire the first sampling signal and the second sampling signal when the first switch K1, the second switch K2, and the third switch K3 are all in the ON state; then, the acquisition chip 13 can control the first switch K1 to be in the OFF state and the second switch K2 and the third switch K3 to be in the ON state, and the sampling chip 13 can acquire the first sampling signal and the second sampling signal when the first switch K1 is in the OFF state and the second switch K2 and the third switch K3 are all in the ON state. Finally, based on the first sampling signal and the second sampling signal when the first switch K1, the second switch K2, and the third switch K3 are all in the ON state, and the first sampling signal and the second sampling signal when the first switch K1 is in the OFF state and the second switch K2 and the third switch K3 are all in the ON state, the battery insulation is tested.

[0198] A more detailed description of the insulation test of battery 20 can be found in the relevant content of the method embodiments below, but for the sake of brevity, it will not be repeated here.

[0199] In one possible implementation, as shown in Figure 5, the battery detection device 10 further includes a third sampling circuit 17 connected to the acquisition chip 13. The acquisition chip 13 acquires a third sampling signal through the third sampling circuit 17, so that the processing module 14 receives the first sampling signal and the third sampling signal acquired by the acquisition chip 13 to detect the positive switch module 24 of the battery 20. The positive switch module 24 is connected to the positive terminal of the battery.

[0200] As an example, battery 20 may include a positive terminal switch module 24. For instance, battery 20 can be connected to a load via the positive terminal switch module 24. As another example, battery 20 can also be connected via the positive terminal switch module 24 to power supply equipment such as a charging station (e.g., battery 20 used in a vehicle) or a photovoltaic power generation system (e.g., battery 20 used in an energy storage system).

[0201] As an example, the positive switch module 24 may include a main positive relay, a pre-charge relay, and a pre-charge resistor, etc.

[0202] Detecting the positive terminal switch module 24 of battery 20 can be understood as checking whether the positive terminal switch module 24 has completed pre-charging. This can be determined by the voltage difference between the two ends of the positive terminal switch module 24 and the negative terminal of battery 20.

[0203] In this embodiment, by setting a third sampling circuit 17 and connecting the third sampling circuit 17 to the acquisition chip 13, the positive electrode switch module 24 of the battery 20 can be detected based on the first sampling signal and the third sampling signal.

[0204] In one possible implementation, the two ends of the third sampling circuit 17 are connected to the end of the positive switch module 24 away from the positive terminal of the battery 20 and the negative terminal of the battery 20, respectively. The third sampling circuit 17 includes multiple voltage divider resistors.

[0205] One end of the third sampling circuit 17 is connected to the end of the positive switch module 24 away from the positive terminal of the battery 20, and the other end of the third sampling circuit 17 is connected to the negative terminal of the battery 20.

[0206] The third sampling circuit 17 may include two voltage divider resistors, or the third sampling circuit 17 may include more voltage divider resistors.

[0207] In this embodiment, the two ends of the third sampling circuit 17, which includes multiple voltage divider resistors, can be connected to the end of the positive switch module 24 away from the positive terminal of the battery 20 and the negative terminal of the battery 20, respectively. This facilitates the acquisition of the third sampling signal of the third sampling circuit 17 acquired by the chip 13, thereby facilitating the detection of the positive switch module 24 of the battery 20 based on the third sampling signal.

[0208] In one possible implementation, multiple voltage divider resistors in the third sampling circuit 17 are connected in series, and the multiple voltage divider resistors in the third sampling circuit 17 include a sixth voltage divider resistor R6. The two ends of the sixth voltage divider resistor R6 are respectively set as third sampling points, and the third sampling points are connected to the acquisition chip 13 for acquiring the third sampling signal.

[0209] The third voltage divider resistor R3 is a sampling resistor. The acquisition chip 13 can acquire the voltage signal across the sixth voltage divider resistor R6 and send this voltage signal to the processing module 14. The processing module 14 can determine the voltage between the positive switch module 24 and the negative terminal of the battery 20 based on this voltage signal, thereby detecting the positive switch module 24.

[0210] The third sampling point can be connected to the port of the acquisition chip 13, such as the ADC interface. The acquisition chip 13 can convert the analog signal of the voltage across the sixth voltage divider resistor R6 into a digital signal, and then transmit the digital signal to the processing module 14.

[0211] As an example, the resistance of the sixth voltage divider resistor R6 is r6, and the resistances of the other voltage divider resistors are r7, r8, ..., rn, respectively. The voltage across the sixth voltage divider resistor R6 acquired by the acquisition chip 13 is U. R6 The processing module 14 can calculate the voltage Uk between the positive terminal switch module 24 and the negative terminal of the battery 20 based on the following formula: Uk = U R6 *(r6+r7…rn) / r6

[0212] In this embodiment, the positive terminal switch module 24 of the battery 20 can be detected based on the difference between the voltage Ua between the positive and negative terminals of the battery 20 determined by the first sampling signal and the voltage Uk determined by the third sampling signal.

[0213] In this embodiment, by setting a third sampling point at both ends of the sixth voltage divider resistor R6 among the multiple voltage divider resistors connected in series in the third sampling circuit 17, the acquisition chip can collect the voltage (first sampling signal) at both ends of the sixth voltage divider resistor R6, thereby enabling the positive terminal switch module 24 of the battery 20 to be detected based on the third sampling signal.

[0214] In one possible implementation, the multiple phase voltage divider resistors in the third sampling circuit 17 also include a seventh voltage divider resistor R7.

[0215] The fewer the number of voltage divider resistors in the third sampling circuit 17, the simpler the design of the third sampling circuit 17. Therefore, the third sampling circuit 17 can include only two voltage divider resistors: the sixth voltage divider resistor R6 and the seventh voltage divider resistor R7.

[0216] As an example, the resistance of the sixth voltage divider resistor R6 is r6, the resistance of the seventh voltage divider resistor R7 is r7, and the voltage across the sixth voltage divider resistor R6 acquired by the acquisition chip 13 is U. R6 The processing module 14 can calculate the voltage Uk between the positive terminal switch module 24 and the negative terminal of the battery 20 based on the following formula: Uk = U R6 *(r6+r7) / r6

[0217] In this embodiment, a sixth voltage divider resistor R6 and a seventh voltage divider resistor R7 connected in series are provided in the third sampling circuit 17. This enables voltage division between the positive switch module 24 and the negative terminal of the battery 20, and the acquisition of the voltage signal after voltage division. This allows for the determination of the voltage between the positive switch module 24 and the negative terminal of the battery 20, facilitating the detection of the positive switch module 24 of the battery 20. Furthermore, the use of two voltage divider resistors reduces the overall number of voltage divider resistors and simplifies the design of the third sampling circuit 17.

[0218] In one possible implementation, as shown in Figure 6, the battery detection device 10 further includes a fourth sampling circuit 15 connected to the acquisition chip 13. The acquisition chip 13 acquires a fourth sampling signal through the fourth sampling circuit 15, so that the processing module 14 can detect the charging and discharging current of the battery 20 through the fourth sampling signal acquired by the acquisition chip 13.

[0219] As an example, a current sampling resistor 23 is set in the charging and discharging circuit of the battery, and current sampling points are set at both ends of the current sampling resistor 23. One end of the fourth sampling circuit 15 is connected to the current sampling point, and the other end is connected to the acquisition chip 13 to collect the voltage across the current sampling resistor 23 in order to determine the charging and discharging current of the battery 20.

[0220] In this embodiment of the application, by connecting the acquisition chip 13 to the fourth sampling circuit 15 of the battery, the charging and discharging current of the battery 20 can be detected, and the acquisition chip 13 can acquire the first sampling signal, the second sampling signal and the fourth sampling signal, etc., and can realize the functions of voltage sampling, insulation sampling and current sampling in one acquisition chip 13, which can reduce the number of components in the battery detection device 10 and simplify the design of the battery detection device 10.

[0221] In some embodiments, the fourth sampling circuit 15 may include a differential mode filtering module and a common mode filtering module.

[0222] As an example, the fourth sampling circuit 15 includes a first current sampling branch 151 and a second current sampling branch 152. The first current sampling branch 151 includes a first inductor L1, and the second current sampling branch 152 includes a second inductor L2. One end of the first current sampling branch 151 is connected to the acquisition chip 13, and the other end of the first current sampling branch 151 is connected to one end of the current sampling resistor 23 (such as a shunt). One end of the second current sampling branch 152 is connected to the acquisition chip 13, and the other end of the second current sampling branch 152 is connected to the other end of the current sampling resistor 23.

[0223] The fourth sampling circuit 15 further includes a third current sampling branch 153 and a fourth current sampling branch 154. The third current sampling branch 153 includes a first capacitor C1, and the second current sampling branch 152 includes a second capacitor C2. One end of the third current sampling branch 153 is connected between the first inductor L1 on the first current sampling branch 151 and the acquisition chip 13. One end of the fourth current sampling branch 154 is connected between the second inductor L2 on the second current sampling branch 152 and the acquisition chip 13. The other ends of the third current sampling branch 153 and the other ends of the fourth current sampling branch 154 are interconnected and connected to the reference ground GND.

[0224] The first inductor L1, the first capacitor C1, the second inductor L2, and the second capacitor C2 can constitute a common-mode filter module. The common-mode filter module can reduce common-mode noise, thereby improving the accuracy of current sampling.

[0225] The fourth sampling circuit 15 also includes a fifth current sampling branch 155, which includes a third capacitor C3. One end of the fifth current sampling branch 155 is connected between the first inductor L1 on the first current sampling branch 151 and the acquisition chip 13, and the other end of the fifth current sampling branch 155 is connected between the second inductor L2 on the second current sampling branch 152 and the acquisition chip 13.

[0226] The first inductor L1, the second inductor L2, and the third capacitor C3 can form a differential-mode filter module. Differential-mode filtering can suppress high-frequency signal interference, improve the signal-to-noise ratio of the current sampling signal, and thus improve the accuracy of current sampling.

[0227] As an example, the fourth sampling circuit 15 may further include a sixth current sampling branch 156 and a seventh current sampling branch 157. The sixth current sampling branch 156 includes a third inductor L3. One end of the seventh current sampling branch 157 is connected to the acquisition chip 13, and the other end of the sixth current sampling branch 156 is connected between the first inductor L1 and the current sampling resistor 23 on the first current sampling branch 151. The seventh current sampling branch 157 includes a fourth capacitor C4. One end of the seventh current sampling branch 157 is connected between the third inductor L3 on the sixth current sampling branch 156 and the acquisition chip 13, and the other end is connected to the reference ground GND.

[0228] Optionally, the third capacitor C3 and the first capacitor C1 can be the same capacitor.

[0229] The sixth current sampling branch 156 and the seventh current sampling branch 157 serve as compensation sampling branches, which can improve the accuracy of sampling.

[0230] In some embodiments, the processing module 14 is further configured to receive a fourth sampling signal acquired by the acquisition chip 13 and determine the charging and discharging current of the battery based on the fourth sampling signal.

[0231] As an example, the processing module 14 can receive the voltage across the current sampling resistor 23 collected by the acquisition chip 13, and thus determine the charging and discharging current of the battery based on the voltage and the resistance value of the current sampling resistor 23.

[0232] In this embodiment, the processing module 14 can determine the charging and discharging current of the battery based on the fourth sampling signal collected by the acquisition chip 13. The acquisition chip 13 can only play the role of information transmission, and there is no need to burn programs such as battery charging and discharging current detection programs into the acquisition chip 13, which can simplify the program burning process.

[0233] Alternatively, in this embodiment, the inductor in the fourth sampling circuit 15 can be replaced with a resistor.

[0234] In some embodiments, the battery detection device 10 includes a power module 16 for supplying power to the acquisition chip 13.

[0235] In this embodiment, the battery detection device 10 is equipped with a power module 16, which can supply power to the acquisition chip 13.

[0236] In some embodiments, a fourth switch K4 may also be provided in the second sampling branch 122. The fourth switch K4 is located at one end of the second sampling branch 122 near the connection point of the first sampling branch 121 and the second sampling branch 122.

[0237] For example, if the second switch is a MOSFET and the withstand voltage of the second switch K2 is less than the second withstand voltage test voltage of the negative terminal of battery 20 to reference ground GND, a fourth switch can be set in the second sampling branch.

[0238] As an example, the withstand voltage of the fourth switch is greater than the second withstand voltage test voltage corresponding to the second sampling branch 122.

[0239] In some embodiments, the fourth switch includes a relay.

[0240] In some embodiments, the fourth switch is connected to the acquisition chip 13 and is used to control the on / off state of the fourth switch through the acquisition chip 13.

[0241] In some embodiments, a switching element may be provided in the first sampling circuit 11 to control the on / off state of the first sampling circuit 11.

[0242] In some embodiments, a switching element may be provided in the third sampling circuit 17 to control the on / off state of the third sampling circuit 17.

[0243] In some embodiments, the acquisition chip 13 and the processing module 14 can communicate in a daisy-chain manner.

[0244] The battery detection apparatus of the present application embodiments has been described in detail above. The battery detection method of the present application embodiments will be described below with reference to Figures 7 to 10. The technical features described in the above apparatus embodiments are applicable to the following method embodiments.

[0245] Figure 7 is a schematic flowchart of the battery detection method provided in the embodiments of this application.

[0246] 710, acquire the first sampling signal of the first sampling circuit acquired by the acquisition chip.

[0247] The acquisition chip is connected to the first sampling circuit.

[0248] 720, acquire the second sampling signal of the second sampling circuit acquired by the acquisition chip.

[0249] The acquisition chip is connected to the second sampling circuit.

[0250] 730, The battery voltage is detected based on the first sampling signal.

[0251] The process of detecting the battery voltage based on the first sampling signal can be found in the relevant description above, and will not be repeated here.

[0252] 740. Based on the first sampling signal and the second sampling signal, the battery insulation is tested.

[0253] In this embodiment, battery voltage detection (step 730) and insulation detection (step 740) can be performed simultaneously or separately. For example, a data acquisition chip can acquire a first sampling signal from the first sampling circuit and a second sampling signal from the second sampling circuit simultaneously, and then voltage detection and insulation detection can be performed simultaneously based on the first and second sampling signals. As another example, the data acquisition chip can first acquire the first sampling signal from the first sampling circuit, and then perform battery voltage detection based on the first sampling signal. After voltage detection is completed, the data acquisition chip can acquire the first sampling signal from the first sampling circuit and the second sampling signal from the second sampling circuit, and then perform insulation detection on the battery based on the first and second sampling signals.

[0254] In this embodiment, battery voltage can be detected based on the first sampling signal acquired by the acquisition chip, and battery insulation can be detected based on the first and second sampling signals acquired by the acquisition chip. The acquisition chip can function solely for information transmission, eliminating the need to program the chip with functions such as insulation detection and voltage detection, thus simplifying the programming process. Battery insulation detection relies on the first and second sampling signals; that is, some of the data required for insulation detection can come from voltage detection data, reducing the amount of data required by the second sampling circuit and thereby simplifying the circuit and communication design of the battery detection device.

[0255] In some embodiments, the two ends of the first sampling circuit are connected to the positive and negative terminals of the battery, respectively, and the first sampling circuit includes a plurality of voltage dividing resistors.

[0256] In some embodiments, multiple voltage divider resistors in the first sampling circuit are connected in series, and the multiple voltage divider resistors in the first sampling circuit include a first voltage divider resistor. A first sampling point is set at both ends of the first voltage divider resistor, and the first sampling point is connected to the acquisition chip for acquiring a first sampling signal.

[0257] In some embodiments, the plurality of voltage divider resistors in the first sampling circuit further include a second voltage divider resistor.

[0258] In some embodiments, the second sampling circuit includes a first sampling branch and a second sampling branch. The first sampling branch includes at least one voltage divider resistor and a first switch. The second sampling branch includes multiple voltage divider resistors. One end of the first sampling branch is connected to the positive terminal of the battery, and one end of the second sampling branch is connected to the negative terminal of the battery. The other ends of the first sampling branch and the other ends of the second sampling branch are interconnected and connected to a reference ground.

[0259] In some embodiments, at least one voltage divider resistor and the first switch in the first sampling branch are connected in series.

[0260] In some embodiments, at least one voltage divider resistor in the first sampling branch includes a third voltage divider resistor.

[0261] In some embodiments, the first switch is connected to the acquisition chip and is used to control the on / off state of the first switch through the acquisition chip.

[0262] In some embodiments, the first switch includes a MOSFET.

[0263] In some embodiments, multiple voltage divider resistors in the second sampling branch are connected in series, and the multiple voltage divider resistors in the second sampling branch include a fourth voltage divider resistor. Second sampling points are respectively set at both ends of the fourth voltage divider resistor, and the second sampling points are connected to the acquisition chip for acquiring the second sampling signal.

[0264] In some embodiments, the plurality of voltage divider resistors in the second sampling branch further includes a fifth voltage divider resistor.

[0265] The insulation detection method for the first sampling circuit including the first switch will be described exemplarily below with reference to Figure 8.

[0266] 810, the first switch is controlled by the acquisition chip to switch between the on and off states.

[0267] The acquisition chip can control the first switch to be turned on or off through its ports, such as I / O ports.

[0268] As an example, the acquisition chip can be used to control the first switch from the on state to the off state, or the acquisition chip can be used to control the first switch from the off state to the on state.

[0269] When the first switch is in the ON state, the first sampling branch is in the ON state; when the first switch is in the OFF state, the first sampling branch is in the OFF state.

[0270] 820, acquire the first and second sampled signals when the first switch is in the on state.

[0271] The first sampling signal and the second sampling signal can be acquired when the first switch is turned on.

[0272] 830, acquire the first sample signal and the second sample signal when the first switch is in the open state.

[0273] The first sampled signal and the second sampled signal can be acquired when the first switch is off.

[0274] It should be understood that the embodiments of this application do not limit the order in which the first switch is controlled to be in the conducting state by the acquisition chip and the first switch is controlled to be in the de-conducting state by the acquisition chip. If the first switch is in the conducting state first, then the first sampling signal and the second sampling signal when the first switch is in the conducting state can be acquired first; if the first switch is in the de-conducting state first, then the first sampling signal and the second sampling signal when the first switch is in the de-conducting state can be acquired first.

[0275] 840. Insulation detection of the battery is performed based on the first sampling signal and the second sampling signal when the first switch is in the on state, and the first sampling signal and the second sampling signal when the first switch is in the off state.

[0276] In this embodiment, a first switch is provided in the first sampling branch, while no switch is provided in the second sampling branch. When the first switch is in the ON state, the first sampling branch is in the ON state. The second sampling branch is always in the ON state.

[0277] In this embodiment, the on / off state of the first switch is controlled by a data acquisition chip. The first and second sampling signals corresponding to when the first switch is on, and the first and second sampling signals corresponding to when the first switch is off, acquired by the data acquisition chip, are used to determine the first insulation resistance value of the battery's positive terminal to the reference ground and the second insulation resistance value of the battery's negative terminal to the reference ground. This eliminates the need to program the data acquisition chip, simplifying the programming process and reducing production steps.

[0278] In some embodiments, the first insulation resistance of the battery's positive terminal to the reference ground and the second insulation resistance of the battery's negative terminal to the reference ground can be determined based on the first and second sampling signals when the first switch is in the on state, the first and second sampling signals when the first switch is in the off state, the resistance values ​​of the plurality of voltage divider resistors in the first sampling circuit, and the resistance values ​​of the plurality of voltage divider resistors in the second sampling circuit.

[0279] As an example, the resistance value r of the first insulation resistance can be determined according to the following formula. p The resistance value r of the second insulation resistance n U 1a =U1R1 *(r1+r2) / r1, U 2a =U 2R1 *(r1+r2) / r1, U 1负 =U 1R4 *(r4+r5) / r4, U 2负 =U 2R4 *(r4+r5) / r4, U 1正 =U 1a -U 1负 U 2正 =U 2a -U 2负 U 1正 / r3+U 1正 / r p =U 1负 / (r4+r5)+U 1负 / r n U 2正 / r p =U 2负 / (r4+r5)+U 2负 / r n ,

[0280] Among them, U 1a U 1负 and U 1正 These represent the voltages of the battery's positive terminal to its negative terminal, the negative terminal to reference ground, and the positive terminal to reference ground, respectively, when the first switch is in the ON state. 2a U 2负 and U 2正 These represent the voltages of the battery's positive terminal to its negative terminal, the negative terminal to reference ground, and the positive terminal to reference ground when the first switch is in the open state, respectively. 1R1 and U 1R4 These are the first and second sampled signals when the first switch is in the ON state, respectively. 2R1 and U 2R4 These are the first and second sampled signals when the first switch is in the open state, respectively, and r1, r2, r3, r4 and r5 are the resistance values ​​of the first, second, third, fourth and fifth voltage divider resistors, respectively.

[0281] In this embodiment, the first sampling signal and the second sampling signal when the first switch is in the on state, the first sampling signal and the second sampling signal when the first switch is in the off state, the resistance values ​​of multiple voltage divider resistors in the first sampling circuit, and the resistance values ​​of multiple voltage divider resistors in the second sampling circuit can be used to quickly and accurately determine the first insulation resistance value of the positive terminal of the battery to the reference ground and the second insulation resistance value of the negative terminal of the battery to the reference ground.

[0282] In some embodiments, the second sampling branch further includes a second switch, which is connected in series with a plurality of voltage divider resistors in the second sampling branch.

[0283] In some embodiments, the second switch is connected to the acquisition chip and is used to control the on / off state of the second switch through the acquisition chip.

[0284] In some embodiments, the second switch includes a MOSFET or a relay.

[0285] The following is an exemplary description of the insulation detection method when the first sampling branch includes the first switch and the second sampling branch includes the second switch, with reference to Figure 9.

[0286] 910, the acquisition chip controls the first switch to switch between the on and off states, and the acquisition chip controls the second switch to be in the on state.

[0287] The acquisition chip can control the first switch to be turned on or off through its ports, such as I / O ports.

[0288] As an example, the acquisition chip can be used to control the first switch from the on state to the off state, or the acquisition chip can be used to control the first switch from the off state to the on state.

[0289] When the first switch is in the ON state, the first sampling branch is in the ON state; when the first switch is in the OFF state, the first sampling branch is in the OFF state.

[0290] The acquisition chip can control the second switch to be turned on or off through its ports, such as I / O ports.

[0291] The second switch is in the ON state, and the second sampling branch is in the ON state.

[0292] As an example, during insulation testing, the acquisition chip can be used to control the second switch to be in the on state and control the first switch to switch from the on state to the off state.

[0293] 920, acquire the first sampling signal and the second sampling signal when both the first switch and the second switch are in the on state.

[0294] When both the first switch and the second switch are in the ON state, the first sampling signal and the second sampling signal are acquired.

[0295] 930, acquire the first sampling signal and the second sampling signal when the first switch is in the open state and the second switch is in the on state.

[0296] When the first switch is in the off state and the second switch is in the on state, the first sampling signal and the second sampling signal are acquired.

[0297] It should be understood that the embodiments of this application do not limit the order in which the acquisition chip controls the first switch to be in the ON state and the acquisition chip controls the first switch to be in the OFF state. If the first switch is in the ON state first, then the first sampling signal and the second sampling signal when both the first switch and the second switch are in the ON state can be acquired first; if the first switch is in the OFF state first, then the first sampling signal and the second sampling signal when the first switch is in the OFF state and the second switch is in the ON state can be acquired first.

[0298] 940. Insulation detection of the battery is performed based on the first and second sampling signals when the first and second switches are in the on state, and the first and second sampling signals when the first switch is in the off state and the second switch is in the on state.

[0299] In this embodiment, a first switch is provided in the first sampling branch, and a second switch is provided in the second sampling branch. When the first switch is in the ON state, the first sampling branch is in the ON state. The second sampling branch is always in the ON state.

[0300] In this embodiment, the on / off state of the first switch is controlled by a data acquisition chip. The first and second sampling signals corresponding to when the first switch is on, and the first and second sampling signals corresponding to when the first switch is off, acquired by the data acquisition chip, are used to determine the first insulation resistance value of the battery's positive terminal to the reference ground and the second insulation resistance value of the battery's negative terminal to the reference ground. This eliminates the need to program the data acquisition chip, simplifying the programming process and reducing production steps.

[0301] In some embodiments, the first insulation resistance of the battery's positive terminal to the reference ground and the second insulation resistance of the battery's negative terminal to the reference ground can be determined based on the first sampling signal and the second sampling signal when the first switch and the second switch are in the on state, the first sampling signal and the second sampling signal when the first switch is in the off state and the second switch is in the on state, the resistance values ​​of the plurality of voltage divider resistors in the first sampling circuit, and the resistance values ​​of the plurality of voltage divider resistors in the second sampling circuit.

[0302] As an example, the resistance value r of the first insulation resistance can be determined according to the following formula. p The resistance value r of the second insulation resistance n U 3a =U 3R1 *(r1+r2) / r1, U 4a =U 4R1 *(r1+r2) / r1, U 3负 =U 3R4 *(r4+r5) / r4, U 4负=U 4R4 *(r4+r5) / r4, U 3正 =U 3a -U 3负 U 4正 =U 4a -U 4负 U 3正 / r3+U 3正 / r p =U 3负 / (r4+r5)+U 3负 / r n U 4正 / r p =U 4负 / (r4+r5)+U 4负 / r n ,

[0303] Among them, U 3a U 3负 and U 3正 These represent the voltage between the positive and negative terminals of the battery, the voltage between the negative terminal of battery 0 and reference ground, and the voltage between the positive terminal of the battery and reference ground, respectively, when both the first and second switches are in the ON state. 4a U 4负 and U 4正 These represent the voltages of the battery's positive terminal to its negative terminal, the negative terminal to reference ground, and the positive terminal to reference ground, respectively, when the first switch is in the open state and the second switch is in the open state. 3R1 and U 3R4 These are the first and second sampled signals when the first and second switches are in the ON state, respectively. 4R1 and U 4R4 These are the first and second sampling signals when the first switch is in the open state and the second switch is in the on state, respectively. r1, r2, r3, r4 and r5 are the resistance values ​​of the first, second, third, fourth and fifth voltage divider resistors, respectively.

[0304] In this embodiment, the first insulation resistance of the battery's positive terminal to the reference ground and the second insulation resistance of the battery's negative terminal to the reference ground can be quickly and accurately determined based on the first sampling signal and the second sampling signal when the first switch and the second switch are in the on state, the first sampling signal and the second sampling signal when the first switch is in the off state and the second switch is in the on state, the resistance values ​​of the multiple voltage divider resistors in the first sampling circuit, and the resistance values ​​of the multiple voltage divider resistors in the second sampling circuit.

[0305] In some embodiments, the first sampling branch further includes a third switch, at least one voltage divider resistor in the first sampling branch, the first switch and the third switch are connected in series, and the third switch is located at the end of the first sampling branch near the positive terminal of the battery, wherein the withstand voltage value of the third switch is greater than or equal to the first withstand voltage test voltage of the first sampling branch, and the withstand voltage value of the first switch is less than the first withstand voltage test voltage.

[0306] In some embodiments, the third switch includes a relay.

[0307] In some embodiments, the third switch is connected to the acquisition chip and is used to control the on / off state of the third switch through the acquisition chip.

[0308] The following is an exemplary description of an insulation detection method when the first sampling branch includes a first switch and a third switch, and the second sampling branch includes a second switch, with reference to Figure 10.

[0309] 1010, the acquisition chip controls the first switch to switch between the on and off states, and controls the second and third switches to be in the on state.

[0310] As an example, the acquisition chip can control the first switch to be turned on or off through its ports, such as I / O ports.

[0311] For example, the acquisition chip can be used to control the first switch from the on state to the off state, or the acquisition chip can be used to control the first switch from the off state to the on state.

[0312] As an example, the acquisition chip can control the third switch to be turned on or off through its ports, such as I / O ports.

[0313] The first switch is in the ON state and the third switch is in the ON state, and the first sampling branch is in the ON state.

[0314] The first switch is in the open state and the third switch is in the closed state, and the first sampling branch is in the closed state.

[0315] The second switch is in the ON state, and the second sampling branch is in the ON state.

[0316] 1020, acquire the first and second sampled signals when the first, second, and third switches are all in the on state.

[0317] When the first switch, the second switch, and the third switch are all in the ON state, the first sampling signal and the second sampling signal can be acquired.

[0318] 1030, acquire the first sample signal and the second sample signal when the first switch is in the open state and the second and third switches are both in the on state.

[0319] When the first switch is in the open state and both the second and third switches are in the on state, the first sampling signal and the second sampling signal are acquired.

[0320] It should be understood that the embodiments of this application do not limit the order in which the first switch is controlled to be in the ON state by the acquisition chip and the first switch is controlled to be in the OFF state by the acquisition chip. If the first switch is in the ON state first, then the first sampling signal and the second sampling signal when the first switch, the second switch, and the third switch are all in the ON state can be acquired first; if the first switch is in the OFF state first, then the first sampling signal and the second sampling signal when the first switch is in the OFF state and the second switch and the third switch are all in the ON state can be acquired first.

[0321] 1040. Insulation detection of the battery is performed based on the first and second sampling signals when the first, second, and third switches are all in the on state, and the first and second sampling signals when the first switch is in the off state and the second and third switches are in the on state.

[0322] In this embodiment, a first switch and a third switch are provided in the first sampling branch, and a second switch is provided in the second sampling branch. When both the first switch and the third switch are in the ON state, the first sampling branch is in the ON state; when both the first switch and the third switch are in the OFF state, the first sampling branch is in the OFF state. The second sampling branch is always in the ON state.

[0323] In this embodiment, the on / off state of the first, second, and third switches is controlled by a data acquisition chip. The first and second sampling signals acquired by the chip when all three switches are on, and the first and second sampling signals when the first switch is off and both switches are on, are used to determine the first insulation resistance between the battery's positive terminal and the reference ground, and the second insulation resistance between the battery's negative terminal and the reference ground. This eliminates the need to program the data acquisition chip, simplifying the programming process and reducing production steps.

[0324] In some embodiments, the first insulation resistance of the battery's positive terminal to the reference ground and the second insulation resistance of the battery's negative terminal to the reference ground are determined based on the first sampling signal and the second sampling signal when the first switch, the second switch, and the third switch are all in the on state, the first sampling signal and the second sampling signal when the first switch is in the off state and the second switch and the third switch are in the on state, the resistance values ​​of the plurality of voltage divider resistors in the first sampling circuit, and the resistance values ​​of the plurality of voltage divider resistors in the second sampling circuit.

[0325] As an example, the resistance value r of the first insulation resistance Rp can be determined according to the following formula. p The resistance value r of the second insulation resistance Rn n U 5a =U 5R1 *(r1+r2) / r1, U 6a =U 6R1 *(r1+r2) / r1, U 5负 =U 5R4 *(r4+r5) / r4, U 6负 =U 6R4 *(r4+r5) / r4, U 5正 =U 5a -U 5负 U 6正 =U 6a -U 6负 U 5正 / r3+U 5正 / r p =U 5负 / (r4+r5)+U 5负 / r n U 6正 / r p =U 6负 / (r4+r5)+U 6负 / r n ,

[0326] Among them, U 5a U 5负 and U 5正 These represent the voltages of the battery's positive terminal to its negative terminal, the negative terminal to reference ground, and the positive terminal to reference ground, respectively, when the first, second, and third switches are all in the ON state. 6a U 6负 and U 6正 These represent the voltages of the battery's positive terminal to its negative terminal, the voltage of the battery's negative terminal to reference ground, and the voltage of the battery's positive terminal to reference ground, respectively, when the first switch is in the open state and the second and third switches are in the open state. 5R1 and U 5R4 These are the first and second sampled signals when the first, second, and third switches are in the ON state, respectively. 6R1 and U 6R4 These are the first and second sampling signals when the first switch is in the open state and the second and third switches are in the on state, respectively. r1, r2, r3, r4 and r5 are the resistance values ​​of the first, second, third, fourth and fifth voltage divider resistors, respectively.

[0327] In this embodiment, the first insulation resistance of the battery's positive terminal to the reference ground and the second insulation resistance of the battery's negative terminal to the reference ground are quickly and accurately determined based on the first and second sampling signals when the first switch, the second switch, and the third switch are all in the on state, the first and second sampling signals when the first switch is in the off state and the second and third switches are in the on state, the resistance values ​​of the multiple voltage divider resistors in the first sampling circuit, and the resistance values ​​of the multiple voltage divider resistors in the second sampling circuit.

[0328] It should be understood that the battery detection device involved in the method embodiment can be referred to the relevant description in Figures 1 to 6. For the sake of brevity, this application will not repeat it here.

[0329] This application provides a battery management system, which includes the battery detection device provided in this application.

[0330] This application provides an energy storage device, which includes a battery and a battery detection device provided in this application.

[0331] This application also provides a battery testing device, which includes a processor and a memory, wherein the memory is used to store instructions, and the processor is used to read the instructions and execute the methods of the aforementioned embodiments of this application based on the instructions.

[0332] The memory can be a separate device independent of the processor, or it can be integrated into the processor.

[0333] Optionally, the battery detection device may also include a transceiver, which the processor can control to communicate with other devices. Specifically, it can send information or data to other devices, or receive information or data sent by other devices.

[0334] It should be understood that the processor in the embodiments of this application may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method embodiments can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor described above can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0335] It is understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0336] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0337] This application also provides a computer-readable storage medium for storing computer programs.

[0338] Optionally, the computer-readable storage medium can be applied to the battery detection device in the embodiments of this application, and when the computer program is run on a computer, it causes the computer to execute the corresponding processes in the various methods of the embodiments of this application. For the sake of brevity, these will not be described in detail here.

[0339] This application also provides a computer program product, including computer program instructions.

[0340] Optionally, the computer program product can be applied to the battery detection device in the embodiments of this application, and the computer program instructions, when run on a computer, cause the computer to execute the corresponding processes in the various methods of the embodiments of this application. For the sake of brevity, they will not be described in detail here.

[0341] This application also provides a computer program.

[0342] Optionally, the computer program can be applied to the battery detection device in the embodiments of this application. When the computer program is run on a computer, it causes the computer to execute the corresponding processes in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0343] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0344] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0345] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection involved in the embodiments of this application may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0346] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0347] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0348] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0349] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery testing device, characterized in that, The battery testing device includes: The first sampling circuit is connected to the acquisition chip; The second sampling circuit is connected to the acquisition chip; The acquisition chip acquires a first sampling signal through the first sampling circuit and a second sampling signal through the second sampling circuit; The processing module is communicatively connected to the acquisition chip and is used to receive the first sampling signal acquired by the acquisition chip to detect the voltage of the battery, and to receive the first sampling signal and the second sampling signal acquired by the acquisition chip to perform insulation detection on the battery.

2. The battery testing device according to claim 1, characterized in that, The first sampling circuit is connected to the positive and negative terminals of the battery, respectively, and includes multiple voltage divider resistors.

3. The battery testing device according to claim 2, characterized in that, The first sampling circuit has multiple voltage divider resistors connected in series, and the multiple voltage divider resistors of the first sampling circuit include a first voltage divider resistor. A first sampling point is set at both ends of the first voltage divider resistor, and the first sampling point is connected to the acquisition chip for acquiring the first sampling signal.

4. The battery testing device according to claim 3, characterized in that, The first sampling circuit also includes a second voltage divider resistor among the multiple voltage divider resistors.

5. The battery testing device according to any one of claims 1 to 4, characterized in that, The second sampling circuit includes a first sampling branch and a second sampling branch. The first sampling branch includes at least one voltage divider resistor and a first switch. The second sampling branch includes multiple voltage divider resistors. One end of the first sampling branch is connected to the positive terminal of the battery, and one end of the second sampling branch is connected to the negative terminal of the battery. The other ends of the first sampling branch and the other ends of the second sampling branch are interconnected and connected to a reference ground.

6. The battery testing device according to claim 5, characterized in that, At least one voltage divider resistor in the first sampling branch and the first switch are connected in series.

7. The battery testing device according to claim 5 or 6, characterized in that, At least one voltage divider resistor in the first sampling branch includes a third voltage divider resistor.

8. The battery testing device according to any one of claims 5 to 7, characterized in that, The first switch is connected to the acquisition chip and is used to control the on / off state of the first switch through the acquisition chip.

9. The battery testing device according to any one of claims 5 to 8, characterized in that, The multiple voltage divider resistors in the second sampling branch are connected in series, and the multiple voltage divider resistors in the second sampling branch include a fourth voltage divider resistor. The two ends of the fourth voltage divider resistor are respectively provided with second sampling points, which are connected to the acquisition chip for acquiring the second sampling signal.

10. The battery testing device according to claim 9, characterized in that, The second sampling branch also includes a fifth voltage divider resistor among the multiple voltage divider resistors.

11. The battery testing device according to any one of claims 5 to 10, characterized in that, The second sampling branch also includes a second switch, which is connected in series with multiple voltage divider resistors in the second sampling branch.

12. The battery testing device according to claim 11, characterized in that, The second switch is connected to the acquisition chip and is used to control the on / off state of the second switch through the acquisition chip.

13. The battery testing device according to any one of claims 5 to 12, characterized in that, The first sampling branch further includes a third switch. At least one voltage divider resistor in the first sampling branch, the first switch, and the third switch are connected in series. The third switch is located at the end of the first sampling branch closest to the positive terminal of the battery. The withstand voltage of the third switch is greater than or equal to the first withstand voltage test voltage of the first sampling branch, and the withstand voltage of the first switch is less than the first withstand voltage test voltage.

14. The battery testing device according to claim 13, characterized in that, The third switch is connected to the acquisition chip and is used to control the on / off state of the third switch through the acquisition chip.

15. The battery testing device according to any one of claims 1 to 14, characterized in that, The battery testing device also includes: A third sampling circuit is connected to the acquisition chip. The acquisition chip acquires a third sampling signal through the third sampling circuit, so that the processing module receives the first sampling signal and the third sampling signal acquired by the acquisition chip to detect the positive terminal switch module of the battery. The positive terminal switch module is connected to the positive terminal of the battery.

16. The battery testing device according to claim 15, characterized in that, The two ends of the third sampling circuit are respectively connected to the end of the positive switch module away from the positive terminal of the battery and the negative terminal of the battery. The third sampling circuit includes multiple voltage divider resistors.

17. The battery testing device according to claim 16, characterized in that, The third sampling circuit contains multiple voltage divider resistors connected in series, including a sixth voltage divider resistor. The two ends of the sixth voltage divider resistor are respectively provided with a third sampling point, which is connected to the acquisition chip for acquiring the third sampling signal.

18. The battery testing device according to claim 17, characterized in that, The third sampling circuit also includes a seventh voltage divider resistor.

19. The battery testing device according to any one of claims 1 to 18, characterized in that, The battery testing device also includes: A fourth sampling circuit is connected to the acquisition chip. The acquisition chip acquires a fourth sampling signal through the fourth sampling circuit, so that the processing module can detect the charging and discharging current of the battery through the fourth sampling signal acquired by the acquisition chip.

20. A battery testing method, characterized in that, The battery detection method includes: Acquire a first sampling signal from a first sampling circuit acquired by a data acquisition chip, wherein the data acquisition chip is connected to the first sampling circuit. Acquire a second sampling signal from a second sampling circuit acquired by the acquisition chip, wherein the acquisition chip is connected to the second sampling circuit; The battery voltage is detected based on the first sampling signal, and, Insulation detection is performed on the battery based on the first sampling signal and the second sampling signal.

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