Battery sampling circuit detection system and method

Abstract

The present invention provides a battery sampling circuit detection system and method, wherein the system includes a balancing circuit, a sampling module, a sensing circuit and a control module, wherein the sampling module is provided with a balancing enable channel and a sampling channel, the sampling module is connected to the balancing circuit through the balancing enable channel, and is respectively connected to the sampling circuit through the sampling channel, the balancing circuit is connected to the battery through the sampling circuit, the control module is respectively connected to the sampling module and the sensing circuit, the control module is used to control the balancing enable channel to be opened or closed, if the balancing circuit passes current when the balancing enable channel is opened, an induction signal is sent, the sensing circuit generates a corresponding feedback signal according to the induction signal, and the control module determines the line condition of the sampling circuit according to the feedback signal. The present invention can avoid causing the jump of the collected voltage, thereby improving the accuracy of the collection, and the system is simple and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to a battery sampling circuit detection system and a battery sampling circuit detection method. Background Art

[0002] At present, battery management systems generally set resistors on the battery sampling loop to determine whether the sampling loop is broken by collecting the resistor voltage. However, this method is costly and requires additional resistors and voltage detection equipment for voltage collection, resulting in a more complex system structure. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent. To this end, one object of the present invention is to provide a battery sampling circuit detection system that can avoid causing the jump of the collected voltage, thereby improving the accuracy of the collection, and the system is simple and low in cost.

[0004] The second objective of the present invention is to provide a battery sampling circuit detection method.

[0005] To achieve the above-mentioned purpose, a first aspect of the present invention proposes a battery sampling circuit detection system, including a balancing circuit, a sampling module, a sensing circuit and a control module, wherein the sampling module is provided with a balancing enable channel and a sampling channel, the sampling module is connected to the balancing circuit through the balancing enable channel, and is respectively connected to the sampling circuit through the sampling channel, the balancing circuit is connected to the battery through the sampling circuit, the control module is respectively connected to the sampling module and the sensing circuit, the control module is used to control the balancing enable channel to be opened or closed, if the balancing circuit passes current when the balancing enable channel is opened, an induction signal is sent, the sensing circuit generates a corresponding feedback signal according to the induction signal, and the control module determines the line condition of the sampling circuit according to the feedback signal.

[0006] According to the battery sampling line detection system proposed in the embodiment of the present invention, a balancing circuit, a sampling module, a sensing circuit and a control module are set, wherein the control module is used to control the opening or closing of the balancing enable channel. If the balancing circuit passes current when the balancing enable channel is turned on, a sensing signal is sent out, and the sensing circuit generates a corresponding feedback signal according to the sensing signal. The control module determines the line condition of the sampling line according to the feedback signal, thereby avoiding the jump of the collected voltage, thereby improving the collection accuracy, and the system is simple and low in cost.

[0007] In addition, the battery sampling line detection system proposed in the above embodiment of the present invention may also have the following additional technical features:

[0008] According to one embodiment of the present invention, a threshold time for signal reception is set in the control module. After the equalization enable channel is turned on, if the control module receives a feedback signal from the sensing circuit within the threshold time, it is determined that the sampling line is not broken; otherwise, it is determined that the sampling line is broken.

[0009] According to one embodiment of the present invention, the balancing circuit includes: a PMOS tube, the source of the PMOS tube is connected to the positive electrode of the battery, and the gate of the PMOS tube is connected to the balancing enable channel of the sampling module; a first resistor, one end of the first resistor is connected to the drain of the PMOS tube; a light-emitting diode, the positive electrode of the light-emitting diode is connected to the other end of the first resistor, and the cathode of the light-emitting diode is connected to the negative electrode of the battery.

[0010] According to one embodiment of the present invention, the sensing circuit includes: a photosensitive diode, the cathode of which is connected to a power supply; a second resistor, one end of which is connected to the anode of the photosensitive diode, and the other end of which is grounded.

[0011] According to one embodiment of the present invention, the sampling module includes a sampling chip, and the sampling chip is provided with a first sampling channel, a second sampling channel and the balancing enable channel, wherein the first sampling channel is connected to the positive electrode of the battery through a third resistor; the second sampling channel is connected to the negative electrode of the battery through a fourth resistor; and the balancing enable channel is connected to the gate of the PMOS tube.

[0012] According to an embodiment of the present invention, the control module is connected to the sampling module via an SPI bus; the control module is respectively connected to the anode of the photodiode and one end of the second resistor via an IO port.

[0013] To achieve the above-mentioned purpose, a second aspect of the present invention proposes a battery sampling circuit detection method based on the battery sampling circuit detection system described in the above-mentioned embodiment, comprising the following steps: controlling the equalization enable channel to be opened through the control module; if the equalization circuit passes current when the equalization enable channel is opened, sending an induction signal through the equalization circuit; receiving the induction signal through the induction circuit and generating a corresponding feedback signal; and judging the circuit condition of the sampling circuit according to the feedback signal through the control module.

[0014] According to the battery sampling circuit detection method proposed in the present invention, the control module controls the opening of the balancing enable channel. If the balancing circuit passes current when the balancing enable channel is opened, the balancing circuit sends out an induction signal, the induction circuit receives the induction signal and generates a corresponding feedback signal, and the control module determines the circuit condition of the sampling circuit according to the feedback signal, thereby avoiding the jump of the collected voltage, thereby improving the collection accuracy, and the system is simple and the cost is low.

[0015] In addition, the battery sampling circuit detection method proposed in the above embodiment of the present invention may also have the following additional technical features:

[0016] According to one embodiment of the present invention, a threshold time for signal reception is set in the control module. After the equalization enable channel is turned on, if the control module receives a feedback signal from the sensing circuit within the threshold time, it is determined that the sampling line is not broken; otherwise, it is determined that the sampling line is broken. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a battery sampling circuit detection system according to an embodiment of the present invention;

[0018] Figure 2 A detection flow chart of a battery sampling circuit detection system according to an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of the structure of a battery pack sampling circuit detection system according to an embodiment of the present invention;

[0020] Figure 4 A detection flow chart of a battery pack sampling line detection system according to an embodiment of the present invention;

[0021] Figure 5 The figure is a flow chart of a battery sampling circuit detection method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Figure 1 Schematic diagram of the structure of a battery sampling circuit detection system according to an embodiment of the present invention.

[0024] like Figure 1As shown, the battery sampling circuit detection system of the embodiment of the present invention includes a balancing circuit 10, a sampling module 20, a sensing circuit 30 and a control module 40. Among them, the sampling module 20 is provided with a balancing enable channel and a sampling channel. The sampling module 20 is connected to the balancing circuit 10 through the balancing enable channel and is respectively connected to the sampling circuit 100 through the sampling channel. The balancing circuit 10 is connected to the battery 200 through the sampling circuit 100. The control module 40 is respectively connected to the sampling module 20 and the sensing circuit 30. The control module 40 is used to control the balancing enable channel to be turned on or off. If the balancing circuit 10 passes current when the balancing enable channel is turned on, a sensing signal is sent out. The sensing circuit 30 generates a corresponding feedback signal according to the sensing signal. The control module 40 determines the line condition of the sampling circuit 100 according to the feedback signal.

[0025] Furthermore, the control module 40 is provided with a threshold time for signal reception. After the equalization enabling channel is turned on, if the control module 40 receives a feedback signal from the sensing circuit 30 within the threshold time, it is determined that the sampling line 100 is not disconnected; otherwise, it is determined that the sampling line 100 is disconnected.

[0026] In one embodiment of the present invention, Figure 1 As shown, the equalization circuit 10 includes: a PMOS tube Q1, the source of the PMOS tube Q1 is connected to the positive electrode of the battery 200, and the gate of the PMOS tube Q1 is connected to the equalization enable channel S1 of the sampling module 20; a first resistor R1, one end of the first resistor R1 is connected to the drain of the PMOS tube Q1; a light emitting diode D1, the positive electrode of the light emitting diode D1 is connected to the other end of the first resistor R1, and the negative electrode of the light emitting diode D1 is connected to the negative electrode of the battery 200. By arranging a light emitting diode on the equalization circuit, it is possible to avoid the collection voltage jumping during equalization, and the sampling line detection and collection detection can be performed simultaneously.

[0027] In one embodiment of the present invention, the sensing circuit 30 includes: a photosensitive diode DL1, the cathode of the photosensitive diode DL1 is connected to the power supply VCC; a second resistor R2, one end of the second resistor R2 is connected to the anode of the photosensitive diode DL1, and the other end of the second resistor R2 is grounded. The transmission of detection information is achieved through optical transmission, which can avoid EMC (Electro Magnetic Compatibility, electromagnetic compatibility) problems.

[0028] In one embodiment of the present invention, Figure 1As shown, the sampling module 20 includes a sampling chip, which is provided with a first sampling channel C0, a second sampling channel C1 and a balancing enabling channel S1, wherein the first sampling channel C0 is connected to the positive electrode of the battery 200 through a third resistor R3; the second sampling channel C1 is connected to the negative electrode of the battery 200 through a fourth resistor R4; and the balancing enabling channel S1 is connected to the gate of the PMOS tube Q1. In addition, the sampling module 20 also has a digital isolation function.

[0029] In one embodiment of the present invention, Figure 1 As shown, the control module 40 is connected to the sampling module 20 via the SPI bus; the control module 40 is connected to the positive electrode of the photodiode DL1 and one end of the second resistor R2 via the IO port.

[0030] Based on the above embodiments, the battery sampling circuit detection system of the present invention can determine whether the sampling circuit 100 of the battery 200 is disconnected by detecting the level of the IO port. For example, when the sampling circuit 100 of the battery 200 is not disconnected, if the balancing enable channel S1 is opened by the control module 40, the PMOS tube Q1 is turned on, and the light emitting diode D1 can have current passing through and emit light, and the light intensity can act on the photosensitive diode DL1 in the sensing circuit 30, and the impedance of the photosensitive diode DL1 can be changed from high impedance to low impedance, and the IO port detection level can be flipped from low level to high level at this time; on the contrary, when the sampling circuit 100 of the battery 200 is disconnected, if the balancing enable channel S1 is opened to turn on the PMOS tube Q1, no current will pass through the light emitting diode D1 and it will not emit light. At this time, the impedance of the photosensitive diode DL1 in the sensing circuit 30 remains unchanged, and the IO port detection level is still low. Therefore, it is possible to detect whether the battery sampling circuit is disconnected, and the structure is simple.

[0031] The following will be combined Figure 2 The detection process of the battery sampling circuit detection system of the present invention is further described.

[0032] like Figure 2 As shown, the following steps are included:

[0033] S10, detecting whether the IO port is at a low level through the control module 40, if so, executing step S20, if not, determining that the sensing circuit 30 is faulty, that is, the photosensitive diode DL1 is faulty or the IP protection fails;

[0034] S20, opening the balancing enable channel through the control module 40, for example, the balancing enable channel S1 can be opened through the control module 40;

[0035] S30, determining by the control module 40 whether a feedback signal, i.e., a high level signal, is received from the sensing circuit 30 within a set threshold time, such as 10 seconds. If so, executing step S40, otherwise executing step S50;

[0036] S40, outputting the judgment result, that is, the sampling line is not disconnected;

[0037] S50, outputting the judgment result, that is, the sampling line is broken;

[0038] S60: Report disconnection fault.

[0039] In addition, it should be further explained that the battery sampling line detection system of the present invention is also suitable for detecting whether the sampling line of the battery pack is broken. Figure 3 The application of the battery sampling circuit detection system of the present invention in a battery pack is described.

[0040] like Figure 3 As shown, each single cell in the corresponding battery pack can be provided with a sampling line 100 and a balancing circuit 10, and adjacent sampling lines 100 and adjacent balancing circuits 10 are connected in parallel, wherein each balancing circuit 10 can be connected to the sampling module 20 through a balancing enable channel, and each sampling line 100 can be connected to the sampling module 20 through two sampling channels, wherein the connected ends of adjacent sampling lines 100 can be connected to the sampling module 20 through one sampling channel.

[0041] Specifically, Figure 3 As shown, the battery pack may include N single cells, and N sampling circuits 100 and N balancing circuits 10 may be set corresponding to the battery pack. The sampling module 20 may include N balancing enable channels and N+1 sampling channels, wherein the first single cell BT1, that is, the battery 200, may be connected in parallel with the first sampling circuit L1, the first sampling circuit L1 may be connected to the first balancing circuit T1, and may be connected to the first sampling channel C0 and the second sampling channel C1 of the sampling module 20 through the resistor R1 and the resistor R2 respectively, and the first balancing circuit T1 may be connected to the first balancing enable channel S1 of the sampling module 20.

[0042] Similarly, the second single battery BT2 can be connected to the sampling module 20 through the second sampling line L2 and the second balancing circuit T2. The connection method can refer to the first single battery BT1 in the above embodiment, and will not be described here to avoid repetition. It should be noted that the connecting end of the first sampling line L1 and the second sampling line L2, that is, K1, can be connected to the first sampling channel C1 of the sampling module 20 through the resistor R2, and the first balancing circuit T1 and the second balancing circuit T2 are connected in series, that is, the cathode of the first light-emitting diode D1 is connected to the source of the second PMOS tube Q2. In addition, the source of the second PMOS tube Q2 can also be connected to the positive electrode of the second single battery BT2.

[0043] A sampling circuit and a balancing circuit are sequentially arranged corresponding to each single cell, and connected to the sampling module 20 , thereby detecting the on-off state of the sampling circuit of each single cell in the battery pack.

[0044] Specifically, Figure 4 As shown, the following steps are included:

[0045] S10, detecting whether the IO port is at a low level through the control module 40, if so, executing step S20, if not, determining that the sensing circuit 30 is faulty, that is, the photosensitive diode DL1 is faulty or the IP protection fails;

[0046] S20, opening the balancing enable channel Sn through the control module 40;

[0047] S30, determining by the control module 40 whether a feedback signal, i.e., a high level signal, is received from the sensing circuit 30 within a set threshold time, such as 10 seconds. If so, executing step S40, otherwise executing step S50;

[0048] S40, outputting the judgment result, that is, the sampling line Ln is not disconnected, and further executing step S70;

[0049] S50, outputting the judgment result, that is, the sampling line Ln is broken;

[0050] S60, reporting the disconnection fault, and further executing step S70;

[0051] S70, disconnecting the balancing enable channel Sn through the control module 40, and detecting whether the IO port is at a low level after a preset time, if so, executing step S80, if not, determining that the sensing circuit 30 is faulty, that is, the photosensitive diode DL1 is faulty or the IP protection fails;

[0052] S80, opening the balancing enabling channel Sn+1 through the control module 40, and executing step S30 until the on-off status of the sampling circuits corresponding to the N single cells in the battery pack is traversed.

[0053] By determining whether the sampling line corresponding to each single cell is broken one by one, the faulty sampling line can be accurately identified, which is convenient for maintenance and management.

[0054] Among them, it should be noted that the above embodiment proposes that the battery sampling line detection system needs to be placed in a battery PACK with a high IP level to ensure that the external light intensity is difficult to affect the sensing circuit. It should be noted that if the battery PACK where the battery sampling line detection system is placed is difficult to achieve a high IP level, the second resistor R2 can be adjusted according to actual conditions to match the light intensity when the detection system is not balanced and the light intensity when balanced to ensure that the IO port detection level is accurately flipped.

[0055] According to the battery sampling line detection system proposed in the embodiment of the present invention, a balancing circuit, a sampling module, a sensing circuit and a control module are set, wherein the control module is used to control the opening or closing of the balancing enable channel. If the balancing circuit passes current when the balancing enable channel is turned on, a sensing signal is sent out, and the sensing circuit generates a corresponding feedback signal according to the sensing signal. The control module determines the line condition of the sampling line according to the feedback signal, thereby avoiding the jump of the collected voltage, thereby improving the collection accuracy, and the system is simple and low in cost.

[0056] Based on the battery sampling circuit detection system proposed in the above embodiment, the present invention further proposes a battery sampling circuit detection method.

[0057] like Figure 5 As shown, the battery sampling circuit detection method of the embodiment of the present invention includes the following steps:

[0058] S1, control the balancing enable channel to open through the control module;

[0059] S2, if the balancing circuit passes current when the balancing enable channel is turned on, an induction signal is sent through the balancing circuit;

[0060] S3, receiving the sensing signal through the sensing circuit and generating a corresponding feedback signal;

[0061] S4, judging the line condition of the sampling line according to the feedback signal through the control module.

[0062] In one embodiment of the present invention, a threshold time for signal reception is set in the control module. After the equalization enable channel is turned on, if the control module receives a feedback signal from the sensing circuit within the threshold time, it is determined that the sampling line is not broken, otherwise, it is determined that the sampling line is broken.

[0063] Specifically, the level of the IO port can be detected to determine whether the battery sampling line is broken.

[0064] For example, when the sampling line of the battery is not disconnected, if the balancing enable channel is turned on by the control module, the PMOS tube is turned on, the light-emitting diode can have current passing through it and emit light, and the light intensity can act on the photosensitive diode in the sensing circuit, and the impedance of the photosensitive diode can be changed from high impedance to low impedance. At this time, the port detection level can be flipped from a low level to a high level; conversely, when the sampling line of the battery is disconnected, if the balancing enable channel is turned on to turn on the PMOS tube, no current will pass through the light-emitting diode and it will not emit light. At this time, the impedance of the photosensitive diode in the sensing circuit remains unchanged, and the IO port detection level is still a low level. Therefore, it is possible to detect whether the battery sampling line is disconnected, and the structure is simple.

[0065] Specifically, Figure 2 As shown, the battery sampling circuit detection method of the embodiment of the present invention includes the following steps:

[0066] S10, detecting whether the IO port is at a low level through the control module, if so, executing step S20, if not, determining that the sensing circuit is faulty, i.e., the photodiode is faulty or the IP protection is invalid;

[0067] S20, opening the balancing enable channel through the control module, for example, the balancing enable channel S1 can be opened through the control module;

[0068] S30, determining by the control module whether a feedback signal, i.e., a high level signal, from the sensing circuit is received within a set threshold time, such as 10 seconds. If so, executing step S40, otherwise executing step S50;

[0069] S40, outputting the judgment result, that is, the sampling line is not disconnected;

[0070] S50, outputting the judgment result, that is, the sampling line is broken;

[0071] S60: Report disconnection fault.

[0072] In addition, it should be noted that the battery sampling circuit detection method of the embodiment of the present invention can also be used for sampling circuit detection of a battery pack. Specifically, Figure 4 As shown, the following steps are included:

[0073] S10, detecting whether the IO port is at a low level through the control module, if so, executing step S20, if not, determining that the sensing circuit is faulty, i.e., the photodiode is faulty or the IP protection is invalid;

[0074] S20, opening the balancing enable channel Sn through the control module;

[0075] S30, determining by the control module whether a feedback signal, i.e., a high level signal, from the sensing circuit is received within a set threshold time, such as 10 seconds. If so, executing step S40, otherwise executing step S50;

[0076] S40, outputting the judgment result, that is, the sampling line Ln is not disconnected, and further executing step S70;

[0077] S50, outputting the judgment result, that is, the sampling line Ln is broken;

[0078] S60, reporting the disconnection fault, and further executing step S70;

[0079] S70, disconnecting the balancing enable channel Sn through the control module, and detecting whether the IO port is at a low level after a preset time, if so, executing step S80, if not, determining that the sensing circuit is faulty, that is, the photodiode is faulty or the IP protection is invalid;

[0080] S80, opening the balancing enabling channel Sn+1 through the control module, and executing step S30 until the on-off status of the sampling circuits corresponding to the N single cells in the battery pack is traversed.

[0081] By determining whether the sampling line corresponding to each single cell is broken one by one, the faulty sampling line can be accurately identified, which is convenient for maintenance and management.

[0082] It should be noted that the above embodiment proposes that the battery sampling line detection system needs to be placed in a battery PACK with a high IP level to ensure that the external light intensity is difficult to affect the sensing circuit. It should be noted that if the battery PACK where the battery sampling line detection system is placed is difficult to achieve a high IP level, the second resistor can be adjusted according to actual conditions to match the light intensity when the detection system is not balanced and the light intensity when balanced to ensure that the IO port detection level is accurately flipped.

[0083] According to the battery sampling circuit detection method proposed in the present invention, the control module controls the opening of the balancing enable channel. If the balancing circuit passes current when the balancing enable channel is opened, the balancing circuit sends out an induction signal, the induction circuit receives the induction signal and generates a corresponding feedback signal, and the control module determines the circuit condition of the sampling circuit according to the feedback signal, thereby avoiding the jump of the collected voltage, thereby improving the collection accuracy, and the system is simple and the cost is low.

[0084] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0085] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A battery sampling line detection system, characterized in that: The invention comprises a balancing circuit, a sampling module, a sensing circuit and a control module, wherein the sampling module is provided with a balancing enable channel and a sampling channel, the sampling module is connected to the balancing circuit through the balancing enable channel, and is respectively connected to the sampling line through the sampling channel, the balancing circuit is connected to the battery through the sampling line, the control module is respectively connected to the sampling module and the sensing circuit, the control module is used to control the balancing enable channel to be turned on or off, if the balancing circuit passes current when the balancing enable channel is turned on, an induction signal is sent, the induction circuit generates a corresponding feedback signal according to the induction signal, and the control module determines the line condition of the sampling line according to the feedback signal, The control module is provided with a threshold time for signal reception. After the equalization enabling channel is turned on, if the control module receives the feedback signal of the sensing circuit within the threshold time, it is determined that the sampling line is not disconnected; otherwise, it is determined that the sampling line is disconnected. The balancing circuit includes: a PMOS tube, the source of which is connected to the positive electrode of the battery, and the gate of which is connected to the balancing enable channel of the sampling module; a first resistor, one end of which is connected to the drain of the PMOS tube; a light emitting diode, the positive electrode of which is connected to the other end of the first resistor, and the negative electrode of which is connected to the negative electrode of the battery. The sensing circuit comprises: a photosensitive diode, a cathode of which is connected to a power supply; and a second resistor, one end of which is connected to the anode of the photosensitive diode and the other end of which is grounded.

2. The battery sampling line detection system according to claim 1, characterized in that: The sampling module includes a sampling chip, and the sampling chip is provided with a first sampling channel, a second sampling channel and the equalization enabling channel, wherein: The first sampling channel is connected to the positive electrode of the battery through a third resistor; The second sampling channel is connected to the negative electrode of the battery through a fourth resistor; The balance enabling channel is connected to the gate of the PMOS tube.

3. The battery sampling line detection system according to claim 2, characterized in that: in, The control module is connected to the sampling module via an SPI bus; The control module is connected to the positive electrode of the photosensitive diode and one end of the second resistor respectively through the IO port.

4. A battery sampling line detection method based on the battery sampling line detection system according to any one of claims 1 to 3, characterized in that: The following steps are involved: Controlling the balancing enabling channel to open by the control module; If the balancing circuit passes current when the balancing enabling channel is turned on, an induction signal is sent through the balancing circuit; receiving the sensing signal through the sensing circuit and generating a corresponding feedback signal; The control module determines the line condition of the sampling line according to the feedback signal.

5. The battery sampling circuit detection method according to claim 4, characterized in that: The control module is provided with a threshold time for signal reception. After the equalization enabling channel is turned on, if the control module receives a feedback signal from the sensing circuit within the threshold time, it is determined that the sampling line is not disconnected; otherwise, it is determined that the sampling line is disconnected.

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