Battery management system and battery system

Abstract

This utility model discloses a battery management system and a battery system. The battery management system includes a first power supply, a first detection branch, a second detection branch, a first sampling branch, and a second sampling branch. The first detection branch outputs a first sampling signal to the first sampling branch, and the ratio of the voltage value of the first sampling signal to the voltage value of the first power supply is a first voltage division ratio. The second detection branch outputs a second sampling signal to the second sampling circuit, and the ratio of the voltage value of the second sampling signal to the voltage value of the first power supply is a second voltage division ratio. The first voltage division ratio of the high-voltage connection circuit varies under different operating conditions, resulting in different voltage values ​​for the first sampling signal; and / or, the second voltage division ratio of the high-voltage connection circuit varies under different operating conditions, resulting in different voltage values ​​for the second sampling signal. This improves the stability, reliability, and anti-interference capability of the battery management system.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and in particular to a battery management system and a battery system. Background Technology

[0002] New energy vehicles use high-voltage electrical systems to drive motors and supply power to other high-voltage components. During operation, various complex operating conditions can cause connectors between high-voltage components to loosen or fall off, thereby compromising the integrity of the high-voltage circuit and increasing safety risks.

[0003] Currently, monitoring the high-voltage circuit status using high-voltage interlock technology effectively improves vehicle safety. However, this method requires simultaneous detection of two electronic signals to determine a fault, resulting in low stability and reliability, poor anti-interference capabilities, and high maintenance difficulty. Utility Model Content

[0004] This utility model mainly provides a battery management system and a battery system, which can improve the stability and reliability of the battery management system, enhance the anti-interference ability of the battery management system, and reduce the maintenance difficulty of the battery management system.

[0005] The technical solution of this utility model is implemented as follows:

[0006] In a first aspect, embodiments of the present invention provide a battery management system, characterized in that the battery management system includes a first power supply, a first detection branch, a second detection branch, a first sampling branch, and a second sampling branch; wherein:

[0007] The first end of the first detection branch and the first end of the second detection branch are both connected to the first power supply. The second end of the first detection branch is connected to the first sampling branch. The second end of the second detection branch is connected to the second sampling branch. The third end of the first detection branch is connected to the first port of the high-voltage connection circuit. The third end of the second detection branch is connected to the second port of the high-voltage connection circuit. The fourth end of the first detection branch and the fourth end of the second detection branch are both grounded.

[0008] The first detection branch is used to output a first sampling signal to the first sampling branch, and the ratio of the voltage value of the first sampling signal to the voltage value of the first power supply is the first voltage division ratio.

[0009] The second detection branch is used to output a second sampling signal to the second sampling circuit. The ratio of the voltage value of the second sampling signal to the voltage value of the first power supply is the second voltage division ratio.

[0010] The high-voltage connection circuit has different first voltage division ratios under different operating conditions, so that the voltage value of the first sampled signal is different; and / or, the high-voltage connection circuit has different second voltage division ratios under different operating conditions, so that the voltage value of the second sampled signal is different.

[0011] Through the aforementioned technical means, the first sampling branch acquires a first sampling signal, and the second sampling branch acquires a second sampling signal. When the high-voltage connection circuit connecting the first and second detection branches is in different states, the connection method between the first and second detection branches is different, resulting in different first voltage division ratios, which in turn cause different voltage values ​​of the acquired first sampling signals, and / or different second voltage division ratios, which in turn cause different voltage values ​​of the second sampling signals. Thus, the battery management system can determine the state of the high-voltage connection circuit based on either the first or second sampling signal, avoiding the influence of a fault in any sampling branch on the determination of the high-voltage connection circuit's state. This improves the stability and reliability of the battery management system, enhances its anti-interference capability, and reduces its maintenance difficulty.

[0012] In some embodiments, the first detection branch includes a first resistor and a second resistor; wherein:

[0013] The first end of the first resistor is connected to the first power supply, the second end of the first resistor is connected to the first end of the second resistor, the first sampling branch and the first port of the high voltage connection circuit respectively, and the second end of the second resistor is grounded.

[0014] By employing the aforementioned technical means, and using the first resistor and the second resistor to form the first detection branch, it is possible to distinguish the different operating states of the high-voltage connection circuit based solely on the first sampling signal, thereby improving the reliability and safety of the battery management system, as well as its fault diagnosis capability and operational stability.

[0015] In some embodiments, the second detection branch includes a third resistor and a fourth resistor; wherein:

[0016] The first end of the third resistor is connected to the first power supply, the second end of the third resistor is connected to the first end of the fourth resistor, the second sampling branch and the second port of the high voltage connection circuit respectively, and the second end of the fourth resistor is grounded.

[0017] By employing the aforementioned technical means, and using the third and fourth resistors to form the second detection branch, it is possible to distinguish the different operating states of the high-voltage connection circuit based solely on the second sampling signal. This improves the reliability and safety of the battery management system, as well as its fault diagnosis capability and operational stability.

[0018] In some embodiments, the battery management system further includes a first diode and a second diode; wherein:

[0019] The first terminal of the first diode is connected to the first power supply, and the second terminal of the first diode is connected to the first detection branch.

[0020] The first end of the second diode is connected to the first power supply, and the second end of the second diode is connected to the second detection branch.

[0021] By using the above-mentioned technical means, a first diode is connected between the first detection branch and the first power supply, and a second diode is connected between the second detection branch and the first power supply. This can prevent the influence of external power supply on the first power supply, improve the safety of the battery management system, avoid the risk of external power supply raising the first power supply, and avoid affecting the accuracy of other sampling signals.

[0022] In some embodiments, the battery management system further includes a first clamping branch, a second clamping branch, and a second power supply; wherein:

[0023] The first clamping branch includes a third diode and a fourth diode. The first end of the third diode is connected to the second end of the fourth diode, the second end of the first sampling branch and the second end of the first detection branch, respectively. The second end of the third diode is connected to the second power supply, and the first end of the fourth diode is grounded.

[0024] The second clamping branch includes a fifth diode and a sixth diode. The first end of the fifth diode is connected to the second end of the sixth diode, the second sampling branch, and the second detection branch, respectively. The second end of the fifth diode is connected to the second power supply, and the first end of the sixth diode is grounded.

[0025] By employing the aforementioned technical means, a first clamping branch is set at the port where the first sampling signal is sampled in the first sampling branch, and a second clamping branch is set at the port where the second sampling signal is sampled in the second sampling branch, damage to the first and second sampling branches caused by the high-voltage connection circuit being in a short power supply state is prevented, thereby improving the safety and reliability of the battery management system.

[0026] In some embodiments, the battery management system further includes a first filtering branch and a second filtering branch; wherein:

[0027] The first filtering branch includes a first capacitor and a fifth resistor. The first end of the fifth resistor is connected to the first end of the first capacitor and the first clamping branch, respectively. The second end of the fifth resistor is connected to the second end of the first detection branch. The second end of the first capacitor is grounded.

[0028] The second filtering branch includes a second capacitor and a sixth resistor. The first end of the sixth resistor is connected to the first end of the second capacitor and the second clamping branch, respectively. The second end of the sixth resistor is connected to the second end of the second detection branch. The second end of the second capacitor is grounded.

[0029] By employing the aforementioned technical means, and by setting up a first filtering branch and a second filtering branch, the influence of high-frequency signals on the first sampling branch and the second sampling branch can be reduced, thereby improving the stability and reliability of the first sampling signal and the second sampling signal, and also enhancing the anti-interference capability of the battery management system.

[0030] In some embodiments, the resistance value of the first resistor is the same as the resistance value of the fourth resistor;

[0031] The resistance value of the second resistor is the same as that of the third resistor;

[0032] The resistance value of the first resistor is different from that of the second resistor.

[0033] Through the above technical means, the resistance value of the first resistor is the same as that of the fourth resistor, the resistance value of the second resistor is the same as that of the third resistor, and the resistance value of the first resistor is different from that of the second resistor. In this way, the first voltage division ratio and the second voltage division ratio of the first detection branch and the second detection branch are different under different states, thereby making the first sampling signal and the second sampling signal different, thus improving the stability and reliability of the circuit.

[0034] In some embodiments, the battery management system further includes a third capacitor and a fourth capacitor; wherein:

[0035] The first terminal of the third capacitor is connected to the third terminal of the first detection branch and the first port of the high voltage connection circuit, respectively, and the second terminal of the third capacitor is grounded.

[0036] The first terminal of the fourth capacitor is connected to the third terminal of the second detection branch and the second port of the high-voltage connection circuit, respectively, and the second terminal of the fourth capacitor is grounded.

[0037] By employing the aforementioned technical means and by setting up a third and fourth capacitor, the anti-interference capability of the battery management system is enhanced, thereby improving the reliability and robustness of the battery management system.

[0038] In some embodiments, the battery management system further includes a high-voltage connection circuit and a control circuit, wherein the high-voltage connection circuit is connected to the first detection branch and the second detection branch respectively, and the control circuit is connected to the first sampling branch and the second sampling branch respectively; wherein:

[0039] The control circuit is used to determine the operating condition of the high-voltage connection circuit based on the first sampling signal provided by the first sampling branch and / or the second sampling signal provided by the second sampling branch.

[0040] Through the above-mentioned technical means, the control circuit determines the operating condition of the high-voltage connection circuit based on the first sampling signal and / or the second sampling signal, thereby improving the efficiency of the battery management system.

[0041] Secondly, embodiments of the present invention provide a battery system, which includes a battery management system as described in any of the first aspects.

[0042] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the technical solutions of this utility model. Attached Figure Description

[0043] Figure 1 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 1 ;

[0044] Figure 2 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 2 ;

[0045] Figure 3 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 3 ;

[0046] Figure 4 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 4 ;

[0047] Figure 5 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 5 ;

[0048] Figure 6 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 6 ;

[0049] Figure 7 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 7 ;

[0050] Figure 8 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 8 ;

[0051] Figure 9 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 9 ;

[0052] Figure 10 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 10 ;

[0053] Figure 11 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 10 one;

[0054] Figure 12 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 10 two;

[0055] Figure 13 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 10 three;

[0056] Figure 14 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure 10 Four;

[0057] Figure 15 This is a schematic diagram of the composition structure of a battery system provided in an embodiment of the present utility model. Detailed Implementation

[0058] To gain a more detailed understanding of the features and technical content of the embodiments of this utility model, the implementation of the embodiments of this utility model will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this utility model.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing embodiments of the invention only and is not intended to limit the invention.

[0060] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0061] It should also be noted that the terms "first, second, third" used in the embodiments of this utility model are only used to distinguish similar objects and do not represent a specific order of objects. It is understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this utility model described herein can be implemented in an order other than that illustrated or described herein.

[0062] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. 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.

[0063] The following is a description of the relevant technologies of this utility model.

[0064] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0065] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0066] In this embodiment of the invention, the battery can be a single battery cell or a battery pack composed of multiple battery cells. A single battery cell is a basic unit capable of converting chemical energy into electrical energy, and can be used to manufacture battery modules or battery packs to supply power to electrical devices. A single battery cell can be a rechargeable battery, which is a battery cell that can be recharged after discharge to reactivate its active materials and continue to be used. Battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and this embodiment is not limited to these types.

[0067] In this embodiment of the invention, the battery may also be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar.

[0068] The high-voltage systems of new energy vehicles typically operate at voltages of several hundred volts or higher, far exceeding the safe voltage for the human body. Such high voltages, if they experience leaks, short circuits, or other malfunctions, could cause serious electrical injuries to occupants of the vehicle, or even trigger major safety accidents such as fires or explosions. Furthermore, new energy vehicles experience various complex operating conditions during operation, such as vibration, impact, and temperature changes. These factors can cause connectors between high-voltage components to loosen or detach, thereby compromising the integrity of the high-voltage circuit and increasing safety risks.

[0069] Therefore, new energy vehicles generally have a high voltage interlock loop function, which is a circuit that indirectly diagnoses the connection status of the high voltage circuit through the low voltage circuit. Normally, the battery pack and the vehicle are connected through a high voltage connector. The high voltage connector has a set of high voltage pins and low voltage pins. The high voltage interlock technology monitors the status of the high voltage circuit by sampling the signal of the low voltage pin and cuts off the power supply or issues an alarm signal in time when an abnormality occurs, thereby ensuring the safe operation of the high voltage system and effectively protecting the safety of personnel and vehicles.

[0070] In related technologies, it is necessary to detect two low-voltage sampling signals simultaneously. When the sampling of one of the voltage detection signals fails, it is impossible to distinguish the state of the high-voltage circuit based on one of the low-voltage sampling signals. This leads to problems such as low stability and reliability, poor anti-interference ability, and high maintenance difficulty in the detection circuit of related technologies.

[0071] Based on this, this utility model embodiment provides a battery management system and a battery system. A first sampling branch acquires a first sampling signal, and a second sampling branch acquires a second sampling signal. When the high-voltage connection circuit connected between the first and second detection branches is in different states, the connection method between the first and second detection branches is different, resulting in different voltage division ratios. This leads to different voltage values ​​for the acquired first sampling signal, and / or different voltage division ratios, leading to different voltage values ​​for the second sampling signal. Thus, the battery management system can determine the state of the high-voltage connection circuit based on either the first or second sampling signal, avoiding the influence of a fault in any sampling branch on the determination of the high-voltage connection circuit's state. This improves the stability and reliability of the battery management system, enhances its anti-interference capability, and reduces its maintenance difficulty.

[0072] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0073] In one embodiment of this utility model, such as Figure 1As shown, the battery management system 10 includes a first power supply 101, a first detection branch 1021, a second detection branch 1022, a first sampling branch 1031, and a second sampling branch 1032; wherein:

[0074] The first end of the first detection branch 1021 and the first end of the second detection branch 1022 are both connected to the first power supply 101. The second end of the first detection branch 1021 is connected to the first sampling branch 1031. The second end of the second detection branch 1022 is connected to the second sampling branch 1032. The third end of the first detection branch 1021 is connected to the first port of the high voltage connection circuit 106. The third end of the second detection branch 1022 is connected to the second port of the high voltage connection circuit 106. The fourth end of the first detection branch 1021 and the fourth end of the second detection branch 1022 are both grounded.

[0075] The first detection branch 1021 is used to output a first sampling signal to the first sampling branch 1031. The ratio of the voltage value of the first sampling signal to the voltage value of the first power supply 101 is the first voltage division ratio.

[0076] The second detection branch 1022 is used to output a second sampling signal to the second sampling circuit. The ratio of the voltage value of the second sampling signal to the voltage value of the first power supply 101 is the second voltage division ratio.

[0077] The high-voltage connection circuit 106 has different first voltage division ratios under different operating conditions, so that the voltage value of the first sampling signal is different; and / or, the high-voltage connection circuit 106 has different second voltage division ratios under different operating conditions, so that the voltage value of the second sampling signal is different.

[0078] It should be noted that the high-voltage interlock circuit is a circuit used to realize the high-voltage interlock detection function. In this embodiment of the utility model, the high-voltage connection circuit 106 can be understood as the high-voltage connection loop connected to the high-voltage interlock circuit. By sampling the first and second sampling signals of the low voltage, the working state of the high-voltage connection circuit 106 is indirectly diagnosed, thereby reflecting the working state of the high-voltage interlock circuit.

[0079] In the embodiments of this utility model, such as Figure 1 As shown, the first detection branch 1021 can be connected to the first port of the high-voltage connection circuit 106, and the second detection branch 1022 can be connected to the second port of the high-voltage connection circuit 106. The high-voltage connection circuit 106 is connected to the battery management system 10 through the first port and the second interface to form a closed loop.

[0080] In this embodiment of the present invention, the first detection branch 1021 and the second detection branch 1022 can be used to divide the supply voltage provided by the first power supply 101. In one example, the first detection branch 1021 and the second detection branch 1022 can be composed of multiple resistors connected in series. The first detection branch 1021 can provide the supply voltage provided by the first power supply 101 to the first sampling branch 1031 according to the first voltage division ratio as the first sampling signal; the second detection branch 1022 can provide the supply voltage provided by the first power supply 101 to the first sampling branch 1031 according to the second voltage division ratio as the second sampling signal.

[0081] In this case, the connection method between the first detection branch 1021 and the second detection branch 1022 is different under different operating conditions of the high-voltage connection circuit 106, resulting in different first voltage division ratios, and thus the first sampling signal output by the first sampling signal is different under different operating conditions; and / or, the second voltage division ratio is different, and thus the first sampling signal output by the second sampling signal is different under different operating conditions. In this way, the current operating condition of the high-voltage connection circuit 106 can be determined based on either the first sampling signal or the second sampling signal.

[0082] It should be noted that the states of the high-voltage connection circuit 106 may include, for example: normal working state, open circuit working state (the circuit in the high-voltage connection circuit 106 is disconnected), short power supply working state (the high-voltage connection circuit 106 is abnormally connected to an external power source), and short ground working state (the high-voltage connection circuit 106 is abnormally grounded).

[0083] It should also be noted that when the high-voltage connection circuit 106 is in different states, the connection method between the first detection branch 1021 and the second detection branch 1022 changes, thereby changing the first voltage division ratio and the second voltage division ratio.

[0084] For example, such as Figure 2 As shown, when the high-voltage connection circuit 106 is in normal working condition, the high-voltage connection circuit 106 between the first port D1 and the second port D2 is equivalent to a wire, connecting the first detection branch 1021 and the second detection branch 1022 in series. When the resistance values ​​of the first detection branch 1021 and the second detection branch 1022 are close, the first detection branch 1021 and the second detection branch 1022 are connected in parallel, making the voltage value of the first sampling branch 1031 equal to the voltage value of the second sampling branch 1032. That is, the first voltage division ratio and the second voltage division ratio are both one-half, making the voltage value of the first sampling signal and the voltage value of the second sampling signal approximately equal to one-half of the voltage value of the first power supply 101.

[0085] For example, such as Figure 3 As shown, when the high-voltage connection circuit 106 is in an open-circuit operating state, the high-voltage connection circuit 106 between the first port D1 and the second port D2 is disconnected, thus breaking the connection between the first detection branch 1021 and the second detection branch 1022. The first voltage division ratio is determined based on the voltage division value of the first detection branch 1021 output from the sampling point of the first sampling branch 1031, and the second voltage division ratio is determined based on the voltage division value of the second detection branch 1022 output from the sampling point of the second sampling branch 1032. Under this operating condition, the series-parallel structure and resistance ratio of the voltage dividing resistors in the first detection branch 1021 are different from those in the second detection branch 1022. Therefore, the first voltage division ratio is different from the second voltage division ratio, resulting in a difference between the voltage values ​​of the first and second sampled signals.

[0086] For example, such as Figure 4 As shown, when the high-voltage connection circuit 106 is in a short-power operation state, the high-voltage connection circuit 106 between the first detection branch 1021 and the second detection branch 1022 is abnormally short-circuited to the external power supply, causing the voltage values ​​output by the first detection branch 1021 and the second detection branch 1022 to the sampling circuit to be pulled up to close to the supply voltage of the first power supply 101. The first voltage division ratio and the second voltage division ratio are both close to 1, and the voltage values ​​of the first sampling signal and the second sampling signal are both close to the supply voltage of the first power supply 101.

[0087] For example, such as Figure 5 As shown, when the high-voltage connection circuit 106 is in a short-ground working state, the high-voltage connection circuit 106 between the first detection branches 1021 is abnormally shorted to ground, causing the voltage values ​​output by the first detection branch 1021 and the second detection branch 1022 to the sampling circuit to be pulled down to near ground (0V), the first voltage division ratio and the second voltage division ratio are both close to 0, and the voltage values ​​of the first sampling signal and the second sampling signal are both close to zero.

[0088] Thus, under different operating conditions, the voltage values ​​of the first sampling signal and the second sampling signal are different. Therefore, the first sampling signal can be input to a control circuit with calculation and processing functions. In the event of a fault in the first sampling branch 1031, the control circuit can determine the current state of the high-voltage connection circuit 106 based on the second sampling signal. Alternatively, in the event of a fault in the second sampling branch 1032, the control circuit can determine the current state of the high-voltage connection circuit 106 based on the first sampling signal. Or, the control circuit can determine the current state of the high-voltage connection circuit 106 based on both the first and second sampling signals.

[0089] It should be noted that, for the first and second sampling signals determined above, the errors of devices such as the first detection branch, the first power supply, and the control circuit can be considered to determine the range of voltage values ​​of the first and second sampling signals under different states of the high-voltage connection circuit.

[0090] This utility model provides a battery management system. A first sampling branch acquires a first sampling signal, and a second sampling branch acquires a second sampling signal. When the high-voltage connection circuit connecting the first and second detection branches is in different states, the connection method between the first and second detection branches is different, resulting in different voltage values ​​for the first and second sampling signals due to different first voltage division ratios and / or different second voltage division ratios. Thus, the battery management system can determine the state of the high-voltage connection circuit based on either the first or second sampling signal, avoiding the influence of faults in either sampling branch on the determination of the high-voltage connection circuit's state. This improves the stability and reliability of the battery management system, enhances its anti-interference capability, and reduces its maintenance difficulty.

[0091] In some embodiments, such as Figure 6 As shown, the first detection branch 1021 includes a first resistor R1 and a second resistor R2; wherein:

[0092] The first end of the first resistor R1 is connected to the first power supply (or VCC1), the second end of the first resistor R1 is connected to the first end of the second resistor R2, the first sampling branch 1031 and the first port of the high voltage connection circuit 106 respectively, and the second end of the second resistor R2 is grounded.

[0093] In this embodiment of the invention, when the high-voltage connection circuit 106 is in an open-circuit state, the connection between the first detection branch 1021 and the second detection branch 1022 is disconnected, and the input voltage is output as the first sampling signal according to the ratio of the first resistor R1 and the second resistor R2, i.e., the first voltage division ratio. That is to say, the voltage value of the first sampling signal is the difference between the voltage drop of VCC1 and the voltage drop of the first resistor R1.

[0094] The resistance values ​​of the first resistor R1 and the second resistor R2 can be set differently to distinguish them from the voltage division ratio under normal operating conditions. For example, the resistance value of the first resistor R1 can be 10K, the resistance value of the second resistor R2 can be 100K, and the voltage value of VCC1 can be 5V.

[0095] When the high-voltage connection circuit 106 is in normal working condition, the first detection branch 1021 and the second detection branch 1022 are connected in parallel. The first voltage division ratio and the second voltage division ratio are both 0.5. Therefore, the voltage values ​​of the first sampling signal and the second sampling signal are both 2.5V.

[0096] When the high-voltage connection circuit 106 is in an open-circuit state, the first voltage division ratio is 1 / 11, and the voltage value of the first sampling signal is approximately 0.45V.

[0097] When the high-voltage connection circuit 106 is under short power supply, the first voltage division ratio is close to 1, and the voltage value of the first sampling signal is close to 5V.

[0098] When the high-voltage connection circuit 106 is short-grounded, the first voltage division ratio is close to 0, and the voltage value of the first sampling signal is close to 0V.

[0099] Thus, the voltage values ​​of the first sampling signal are different when the high-voltage connection circuit 106 is in different states. Therefore, the current state of the high-voltage connection circuit 106 can be determined based solely on the first sampling signal.

[0100] This utility model provides a battery management system that uses a first resistor and a second resistor to form a first detection branch. This allows the system to distinguish different operating states of the high-voltage connection circuit based solely on a first sampling signal, thereby improving the reliability and safety of the battery management system, as well as its fault diagnosis capability and operational stability.

[0101] In some embodiments, such as Figure 6 As shown, the second detection branch 1022 includes a third resistor R3 and a fourth resistor R4; wherein:

[0102] The first end of the third resistor R3 is connected to the first power supply, the second end of the third resistor R3 is connected to the first end of the fourth resistor R4, the second sampling branch 1032 and the second port of the high voltage connection circuit 106 respectively, and the second end of the fourth resistor R4 is grounded.

[0103] In this embodiment of the invention, when the high-voltage connection circuit 106 is in an open-circuit state, the connection between the first detection branch 1021 and the second detection branch 1022 is disconnected, and the input voltage is output as the second sampling signal according to the ratio of the third resistor R3 and the fourth resistor R4, i.e., the second voltage division ratio. That is to say, the voltage value of the second sampling signal is the difference between the voltage drop of VCC1 and the voltage drop of the third resistor R3.

[0104] Among them, the resistance value of the third resistor R3 and the resistance value of the fourth resistor R4 can be set differently, and the resistance ratio of the first resistor R1 and the second resistor R2 is different. It also needs to be distinguished from the voltage division ratio under normal working conditions. For example, the resistance value of the third resistor R3 can be 100K, the resistance value of the fourth resistor R4 can be 10K, and the voltage value of VCC1 can be 5V.

[0105] When the high-voltage connection circuit 106 is in normal working condition, the first detection branch 1021 and the second detection branch 1022 are connected in parallel. The first voltage division ratio and the second voltage division ratio are both 0.5. Therefore, the voltage values ​​of the first sampling signal and the second sampling signal are both 2.5V.

[0106] When the high-voltage connection circuit 106 is in an open-circuit state, the second voltage division ratio is 10 / 11, and the voltage value of the second sampling signal is approximately 4.55V. Thus, the second sampling signal and the first sampling signal correspond to different voltage division ratios, and these ratios differ from those under normal operating conditions.

[0107] When the high-voltage connection circuit 106 is under short power supply, the second voltage division ratio is close to 1, and the voltage value of the second sampling signal is close to 5V.

[0108] When the high-voltage connection circuit 106 is short-grounded, the second voltage division ratio is close to 0, and the voltage value of the second sampling signal is close to 0V.

[0109] Thus, the voltage values ​​of the second sampling signal are different when the high-voltage connection circuit 106 is in different states. Therefore, the current state of the high-voltage connection circuit 106 can be determined based solely on the second sampling signal.

[0110] It should also be noted that, in some embodiments, the current state of the high-voltage connection circuit 106 can be determined based on the first sampling signal and the second sampling signal, thereby improving the accuracy of detection.

[0111] This utility model provides a battery management system that uses a second detection branch composed of a third resistor and a fourth resistor to distinguish different operating states of the high-voltage connection circuit based solely on the second sampling signal. This improves the reliability and safety of the battery management system, as well as its fault diagnosis capability and operational stability.

[0112] In some embodiments, see continue to see Figure 6 The resistance value of the first resistor R1 is the same as the resistance value of the fourth resistor R4.

[0113] The resistance value of the second resistor R2 is the same as the resistance value of the third resistor R3;

[0114] The resistance value of the first resistor R1 is different from the resistance value of the second resistor R2.

[0115] It should be noted that when the high-voltage connection circuit 106 is in normal working condition, the resistance values ​​of the first detection branch 1021 and the second detection branch 1022 are configured to be equal. Specifically, the resistance value of the first resistor R1 is equal to the resistance value of the fourth resistor R4, and the resistance value of the second resistor R2 is equal to the resistance value of the third resistor R3. Thus, under this operating condition, the circuit structure of the first resistor R1 and the third resistor R3 in parallel, and the second resistor R2 and the fourth resistor R4 in parallel, ensures that the voltage values ​​of the voltage dividers in the first detection branch 1021 and the second detection branch 1022 are equal. Both the first voltage division ratio and the second voltage division ratio are 1 / 2, and the voltage values ​​of both the first sampling signal and the second sampling signal are 1 / 2 of the voltage of the first power supply (also referred to as VCC1).

[0116] In this embodiment of the present invention, when the high-voltage connection circuit 106 is in an open-circuit operating state, since the resistance values ​​of the first resistor R1 and the second resistor R2 are not equal, and the resistance values ​​of the fourth resistor R4 and the third resistor R3 are not equal, the first voltage division ratio of the first detection branch 1021 is the ratio of the resistance value of the first resistor to the resistance value of the second resistor, and the first sampling signal sampled by the first sampling branch 1031 is the product of the first voltage division ratio and the supply voltage provided by the first power supply; the second voltage division ratio of the second detection branch 1022 is the ratio of the resistance value of the third resistor R3 to the resistance value of the fourth resistor R4, and the second voltage division ratio is different from the first voltage division ratio, and the second sampling signal sampled by the second sampling branch 1032 is the product of the second voltage division ratio and the supply voltage provided by VCC1.

[0117] This utility model embodiment provides a battery management system in which the resistance value of the first resistor is the same as that of the fourth resistor, the resistance value of the second resistor is the same as that of the third resistor, and the resistance value of the first resistor is different from that of the second resistor. In this way, the first voltage division ratio and the second voltage division ratio of the first detection branch and the second detection branch are different under different states, thereby making the first sampling signal and the second sampling signal different, thus improving the stability and reliability of the circuit.

[0118] In some embodiments, such as Figure 7 As shown, the battery management system 10 also includes a first diode D1 and a second diode D2; wherein:

[0119] The first terminal of the first diode D1 is connected to the first power supply, and the second terminal of the first diode D1 is connected to the first detection branch 1021.

[0120] The first terminal of the second diode D2 is connected to the first power supply, and the second terminal of the second diode D2 is connected to the second detection branch 1022.

[0121] It should be noted that the first diode D1 and the second diode D2 are electronic components with unidirectional conduction characteristics, which are generally used to prevent current from flowing in the opposite direction and can play a role in preventing reverse flow.

[0122] In this embodiment of the invention, the first terminal of the first diode D1 is connected to VCC1. Its characteristics determine that current can only flow from VCC1 to the first detection branch 1021. This design ensures that even if the high-voltage connection circuit 106 is in a short power supply state, it will not generate reverse current to VCC1, thereby protecting VCC1.

[0123] In this embodiment of the invention, the first end of the second diode D2 is connected to VCC1. Its characteristics determine that current can only flow from VCC1 to the second detection branch 1022. This design ensures that even if the high-voltage connection circuit 106 is in a short power supply state, it will not generate reverse current to VCC1, thereby protecting VCC1.

[0124] When the voltage of the external short power supply is greater than the voltage of VCC1, there is a risk that the supply voltage of VCC1 will be pulled up, which will affect the accuracy of other sampling signals obtained based on the supply voltage.

[0125] It should be noted that the first diode D1 and the second diode D2 are generally of the same type, and therefore their voltage drops are generally the same at the same temperature. Thus, when the high-voltage connection circuit 106 is in normal operating condition, the resistance values ​​of the first detection branch and the second voltage divider circuit are the same, and the first voltage division ratio and the second voltage division ratio are both 1 / 2. When the high-voltage connection circuit 106 is in an open-circuit state, the voltage value of the first sampling signal is the difference between the supply voltage of the first power supply and the voltage drop of the first diode D1 and the voltage drop of the first resistor; the voltage value of the first sampling signal is also the difference between the supply voltage of the first power supply and the voltage drop of the second diode D2 and the voltage drop of the third resistor.

[0126] It should be noted that the first diode D1 and the second diode D2 may be in different operating conditions under different conditions. Therefore, when determining the voltage range of the first sampling signal and the voltage range of the second sampling signal under different operating conditions, the error in the voltage value of the sampling signal caused by the different voltage drops of the first diode D1 and the second diode D2 can be considered.

[0127] This utility model embodiment provides a battery management system in which a first diode is connected between a first detection branch and a first power supply, and a second diode is connected between a second detection branch and the first power supply. This can prevent external power from affecting the first power supply, improve the safety of the battery management system, avoid the risk of external power raising the first power supply, and avoid affecting the accuracy of other sampling signals.

[0128] In some embodiments, such as Figure 8 As shown, the battery management system also includes a first clamping branch 1041, a second clamping branch 1042, and a second power supply (or VCC2); wherein:

[0129] The first clamping branch 1041 includes a third diode D3 and a fourth diode D4. The first end of the third diode D3 is connected to the second end of the fourth diode D4, the second end of the first sampling branch 1031 and the second end of the first detection branch, respectively. The second end of the third diode D3 is connected to the second power supply, and the first end of the fourth diode D4 is grounded.

[0130] The second clamping branch 1042 includes a fifth diode D5 and a sixth diode D6. The first end of the fifth diode D5 is connected to the second end of the sixth diode D6, the second sampling branch 1032, and the second end of the second detection branch, respectively. The second end of the fifth diode D5 is connected to the second power supply, and the first end of the sixth diode D6 is grounded.

[0131] It should be noted that the first clamping branch 1041 and the second clamping branch 1042 can be understood as utilizing the relatively stable and small forward voltage drop of the diode to limit the potential at a certain point in the circuit, thereby clamping the voltage of the sampling point of the first sampling branch 1031 within a certain voltage range.

[0132] In this embodiment of the invention, the first clamping branch 1041 is disposed between the first sampling branch 1031 and the first detection branch, and is composed of a third diode D3 and a fourth diode D4 connected in reverse parallel. The power supply voltage is provided by a second power supply. Only one of the third diode D3 and the fourth diode D4 can be turned on at a time, while the other is in the off state. This clamps the voltage range of the first sampling signal within ±0.7V of the power supply voltage of the second power supply, preventing damage to the first sampling branch from excessively high voltage when there is an abnormality in the high voltage connection circuit, such as when it is in a short power supply state.

[0133] In this embodiment of the invention, the second clamping branch 1042 is disposed between the second sampling branch 1032 and the second detection branch, and is composed of a fifth diode D5 and a sixth diode D6 connected in reverse parallel. It is supplied with power by a second power supply, wherein only one of the fifth diode D5 and the sixth diode D6 can be turned on at a time, while the other is in the off state. This clamps the voltage range of the second sampling signal within ±0.7V of the power supply voltage of the second power supply, preventing damage to the first sampling branch 1031 caused by excessively high voltage when there is an abnormality in the high voltage connection circuit, such as when it is in a short power supply state.

[0134] The supply voltage of the second power supply can be equal to that of the first power supply; for example, it can be 5V.

[0135] This utility model provides a battery management system. By setting a first clamping branch at the port of the first sampling branch that samples the first sampling signal and a second clamping branch at the port of the second sampling branch that samples the second sampling signal, the system prevents the high-voltage connection circuit from damaging the first and second sampling branches when it is in a short power supply state, thereby improving the safety and reliability of the battery management system.

[0136] In some embodiments, such as Figure 9 As shown, the battery management system 10 also includes a first filtering branch 1051 and a second filtering branch 1052; wherein:

[0137] The first filter branch 1051 includes a first capacitor C1 and a fifth resistor R5. The first end of the fifth resistor R5 is connected to the first end of the first capacitor C1 and the first clamping branch respectively. The second end of the fifth resistor R5 is connected to the second end of the first detection branch. The second end of the first capacitor C1 is grounded.

[0138] The second filter branch 1052 includes a second capacitor C2 and a sixth resistor R6. The first end of the sixth resistor R6 is connected to the first end of the second capacitor C2 and the second clamping branch, respectively. The second end of the sixth resistor R6 is connected to the second end of the second detection branch. The second end of the second capacitor C2 is grounded.

[0139] In this embodiment of the invention, a first filtering branch 1051 can be provided between the first detection branch and the first clamping branch. The first filtering branch 1051 includes a first capacitor C1 and a fifth resistor R5. The first capacitor C1 is used to absorb high-frequency noise and voltage spikes from the high-voltage connection circuit, improving the circuit's anti-interference capability. The fifth resistor R5 is used to limit the rate of current change and suppress rapidly fluctuating noise. In this way, the signal from the high-voltage connection circuit is transmitted to the first sampling branch 1031 for sampling after passing through the first filtering branch 1051, improving the stability and security of the first sampled signal.

[0140] In this embodiment of the invention, a second filtering branch 1052 can be provided between the second detection branch and the second clamping branch. The second filtering branch 1052 includes a second capacitor C2 and a sixth resistor R6. Referring to the first capacitor C1, the second capacitor C2 can absorb high-frequency noise and voltage spikes from the high-voltage connection circuit, and the sixth resistor R6 is used to limit the rate of current change and suppress rapidly fluctuating noise. In this way, the signal from the high-voltage connection circuit is transmitted to the second sampling branch for sampling after passing through the second filtering branch 1052, thereby improving the stability and security of the second sampling signal.

[0141] It should be noted that since the fifth resistor R5 and the sixth resistor R6 are part of the filter circuit, their resistance values ​​are not considered when calculating the voltage values ​​of the first and second sampled signals. Furthermore, the fifth resistor R5 and the sixth resistor R6 also have a current-limiting function, ensuring that the current of the sampled first and second sampled signals does not exceed the withstand voltage of the first sampling circuit 1031 and the second sampling circuit 1032.

[0142] This utility model provides a battery management system that reduces the impact of high-frequency signals on the first and second sampling branches by setting up a first filtering branch and a second filtering branch, thereby improving the stability and reliability of the first and second sampling signals and enhancing the anti-interference capability of the battery management system.

[0143] In some embodiments, such as Figure 9 As shown, the battery management system 10 also includes a third capacitor C3 and a fourth capacitor C4; wherein:

[0144] The first terminal of the third capacitor C3 is connected to the third terminal of the first detection branch and the first port of the high voltage connection circuit, respectively, and the second terminal of the third capacitor C3 is grounded.

[0145] The first terminal of the fourth capacitor C4 is connected to the third terminal of the second detection branch and the second port of the high voltage connection circuit, respectively, and the second terminal of the fourth capacitor C4 is grounded.

[0146] In this embodiment of the invention, the third capacitor C3 is connected between the high-voltage connection circuit and the first detection branch, and the fourth capacitor C4 is connected between the high-voltage connection circuit and the second detection branch. The third capacitor C3 and the fourth capacitor C4 are used to absorb voltage spikes and high-frequency noise, weaken external interference, and enhance the stability of the sampling signal.

[0147] This utility model provides a battery management system that enhances the anti-interference capability of the battery management system by setting a third capacitor and a fourth capacitor, thereby improving the reliability and robustness of the battery management system.

[0148] In another embodiment of this utility model, such as Figures 10 to 14 As shown, the battery management system 10 includes a high-voltage connection circuit 106 and a control circuit 107. The high-voltage connection circuit 106 is connected to the first detection branch and the second detection branch, respectively. The control circuit is connected to the first sampling branch 1031 and the second sampling branch 1032, respectively.

[0149] The control circuit 107 is used to determine the operating condition of the high-voltage connection circuit based on the first sampling signal provided by the first sampling branch 1031 and / or the second sampling signal provided by the second sampling branch 1032.

[0150] In this embodiment of the utility model, the high-voltage connection circuit 106 is connected to the battery management system 10 through different ports, and the control circuit 107 determines the current operating condition of the high-voltage circuit by acquiring the operating condition of the high-voltage connection circuit 106 detected by the battery management system 10.

[0151] The control circuit 107 may include a device with computing processing capabilities, such as a microcontroller unit (MCU).

[0152] In this embodiment of the utility model, the battery management system 10 can acquire either the first sampling signal or the second sampling signal, and determine the range of the voltage value of the first sampling signal and / or the range of the voltage value of the second sampling signal, thereby determining the current operating condition of the high-voltage connection circuit 106.

[0153] Thus, this utility model embodiment provides a battery management system. The battery management system samples the high-voltage connection circuit to obtain a first sampling signal and / or a second sampling signal, enabling the control circuit to determine the current operating condition of the high-voltage connection circuit based on the first sampling signal and / or the second sampling signal. This avoids the influence of any sampling branch fault on the determination of the state of the high-voltage connection circuit, and improves the stability and reliability of the state detection of the high-voltage connection circuit.

[0154] In another embodiment of this utility model, Figure 15 This is a schematic diagram of the composition structure of a battery system provided in an embodiment of the present utility model. Figure 15 As shown, the battery system 20 includes the battery management system 10 as described in the foregoing embodiments.

[0155] The battery system provided in the embodiments of this utility model will be described in detail below with reference to specific application scenarios.

[0156] like Figures 10 to 14 As shown, the first port D1 and the second port D2 of the high-voltage connection circuit serve as high-voltage interlock interfaces.

[0157] In the embodiments of this utility model, such as Figures 10 to 14 As shown, the battery management system 10 includes:

[0158] The third capacitor C3 and the fourth capacitor C4: serve as input filter capacitors, absorbing voltage spikes and improving anti-static capability.

[0159] First power supply (or VCC1): provides pull-up power.

[0160] First diode D1 and second diode D2: As anti-reverse devices, they prevent the external power supply from raising the first power supply when the high-voltage connection circuit is in a short power supply state, thus affecting other sampling channels.

[0161] First detection branch and second detection branch: The first detection branch includes a first resistor R1 and a second resistor R2, and the second detection branch includes a third resistor R3 and a fourth resistor R4. Through resistor voltage division, the voltage is sampled, allowing the control circuit to distinguish the state of the high-voltage connection circuit based on either the first or second sampled signal.

[0162] First filtering branch and second filtering branch: The first filtering branch includes a first capacitor C1 and a fifth resistor R5, and the second filtering branch includes a second capacitor C2 and a sixth resistor R6, used to filter out high-frequency noise.

[0163] First clamping branch and second clamping branch: The first clamping branch includes a third diode and a fourth diode, and the second clamping branch includes a fifth diode and a sixth diode, used to protect the ports of the first sampling branch and the second sampling branch.

[0164] The first sampling branch 1031 and the second sampling branch 1032 include sampling ports, which are used to sample the first sampling signal (or AI_HVIL_OUT signal) and the second sampling signal (or AI_HVIL_IN signal), respectively.

[0165] In some embodiments, such as Figures 10 to 14As shown, in a battery management system 10 that includes at least a first power supply, a first detection branch, a second detection branch, a first diode D1, a second diode D2, a first clamping branch, a second clamping branch, a first sampling branch 1031, and a second sampling branch 1032, the first sampling signal and / or the second sampling signal can be sent to the control circuit. In this embodiment of the invention, the control circuit 107 can be based on worst-case circuit analysis (WCCA), considering that the supply voltage of the first power supply and the supply voltage of the second power supply are both 5V (considering a 2% error), R1 = R4 = 10K (1% resistance, considering a 3% error), R2 = R4 = 100K (1% resistance, considering a 3% error), the voltage drop range of D1 and D3 at all temperatures is 0.1V to 0.55V, and the analog-to-digital converter (ADC) of the control circuit is 12-bit, considering 6 least significant bits (Least Significant Bits). Under the condition of Significant Bit (LSB) error, determine the range of voltage values ​​of the first and second sampled signals under different operating conditions of the high-voltage connection circuit.

[0166] Among them, such as Figure 10 As shown, when the high-voltage connection circuit is in normal working condition, based on the aforementioned embodiment, the first resistor R1 and the third resistor R3 are connected in parallel, and the second resistor R2 and the fourth resistor R4 are connected in parallel. Considering the above-mentioned error, the voltage value range of the first sampling signal is determined to be [2061-2635] mV, and the voltage value range of the second sampling signal is [2061-2635] mV.

[0167] Among them, such as Figure 11 As shown, with the high-voltage connection circuit in an open-circuit state, based on the aforementioned embodiment, the voltage value of the first sampling signal is the difference between the supply voltage of the first power supply and the voltage drop of the first diode D1 and the voltage drop of the first resistor R1. Considering the above error, the voltage value of the first sampling signal is determined to be in the range of [3848-4670] mV; the voltage value of the second sampling signal is the difference between the supply voltage of the first power supply and the voltage drop of the second diode D2 and the voltage drop of the third resistor D3. Considering the above error, the voltage value of the second sampling signal is determined to be in the range of [360-497] mV.

[0168] Among them, such as Figure 12As shown, when the high-voltage connection circuit is in a short-power state, based on the aforementioned embodiment, the first clamping branch clamps the voltage value of the first sampling signal to about 5V. Considering the above-mentioned error, the voltage value range of the first sampling signal is determined to be [4797-5000]mV; the second clamping branch clamps the voltage value of the second sampling signal to about 5V. Considering the above-mentioned error, the voltage value range of the second sampling signal is determined to be [4797-5000]mV.

[0169] Among them, such as Figure 13 As shown, when the high-voltage connection circuit is short-grounded, based on the aforementioned embodiment, the voltage values ​​of the first sampling signal and the second sampling signal are both close to 0V. Considering the above error, the voltage value of the first sampling signal is determined to be in the range of [0-7]mV, and the voltage value of the second sampling signal is determined to be in the range of [0-7]mV.

[0170] It should be noted that, as can be seen from the WCCA calculation results above, the control circuit 107 can completely distinguish the four states of the high-voltage connection circuit based on both the first and second sampling signals. The current operating condition of the high-voltage connection circuit can be determined based on the range of the voltage value of the first sampling signal, and / or, based on the range of the voltage value of the second sampling signal. For example, if the voltage value of the first sampling signal is detected to be in the range of [4797-5000] mV, it can be determined that the high-voltage connection circuit is in a short-power supply state; if the second voltage signal is detected to be in the range of [0-7] mV, it can be determined that the high-voltage connection circuit is in a short-ground state. This solves the problem in related technologies where two sampling signals are needed to distinguish the current operating condition of the high-voltage connection circuit. Even if one sampling branch fails, a single sampling signal can distinguish the different operating states of the high-voltage connection circuit.

[0171] It should also be noted that, for the aforementioned embodiment, when the supply voltage of the first power supply and the supply voltage of the second power supply are changed from 5V (considering a 2% error) to 3.3V (considering a 2% error), and other conditions remain unchanged, the control circuit 107 can determine the range of the voltage values ​​of the first sampling signal and the second sampling signal under different operating conditions of the high-voltage connection circuit through WCCA.

[0172] Among them, such as Figure 10 As shown, under normal operating conditions of the high-voltage connection circuit, considering the above-mentioned errors, the voltage range of the first sampling signal is determined to be [1271-1721] mV, and the voltage range of the second sampling signal is also [1271-1721] mV.

[0173] Among them, such as Figure 11 As shown, with the high-voltage connection circuit in an open-circuit state, the voltage value of the first sampling signal is determined to be in the range of [2374-3051] mV, and the voltage value of the second sampling signal is determined to be in the range of [222-325] mV.

[0174] Among them, such as Figure 12 As shown, with the high-voltage connection circuit in a short-power state, the voltage range of the first sampling signal is determined to be [3166-3300] mV, and the voltage range of the second sampling signal is [222-325] mV.

[0175] Among them, such as Figure 13 As shown, when the high-voltage connection circuit is short-grounded, the voltage value of the first sampling signal is determined to be in the range of [0-5]mV, and the voltage value of the second sampling signal is determined to be in the range of [0-5]mV.

[0176] Alternatively, in some embodiments, when R1 = R4 = 10K is changed to R1 = R4 = 20K (1% resistance, considering 3% error), the range of voltage values ​​of the first sampled signal and the second sampled signal under different operating conditions of the high-voltage connection circuit can be determined based on WCCA.

[0177] Among them, such as Figure 10 As shown, under normal operating conditions of the high-voltage connection circuit, considering the above-mentioned errors, the voltage range of the first sampling signal is determined to be [2061-2635] mV, and the voltage range of the second sampling signal is also [2061-2635] mV.

[0178] Among them, such as Figure 11 As shown, with the high-voltage connection circuit in an open-circuit state, the voltage value of the first sampling signal is determined to be in the range of [3501-4301] mV, and the voltage value of the second sampling signal is determined to be in the range of [669-901] mV.

[0179] Among them, such as Figure 12 As shown, with the high-voltage connection circuit in a short-power state, the voltage range of the first sampling signal is determined to be [4797-5000] mV, and the voltage range of the second sampling signal is also [4797-5000] mV.

[0180] Among them, such as Figure 13 As shown, when the high-voltage connection circuit is short-grounded, the voltage value of the first sampling signal is determined to be in the range of [0-7]mV, and the voltage value of the second sampling signal is in the range of [0-7]mV.

[0181] It should be noted that in practical applications, the judgment range can be appropriately widened based on the WCCA calculation results, thereby increasing the robustness of the detection and preventing the voltage values ​​of the first or second sampled signals from falling into unknown ranges, which would affect the judgment of the detection results.

[0182] It should also be noted that, such as Figure 14 As shown, even when the high-voltage connection circuit is not connected, the first and second sampling signals can still be used to determine whether the high-voltage connection circuit is malfunctioning. For example, when the high-voltage connection circuit is in a short-power state and the supply voltage of the first power supply is 5V, the voltage value of the first sampling signal is approximately 5V, and the voltage value of the second sampling signal is within the normal range, approximately 0.5V. Alternatively, when the high-voltage connection circuit is in a short-ground state, the second sampling signal is outside the normal range.

[0183] Thus, in this embodiment of the invention, by setting up a first detection branch, a second detection branch, a first diode, and a second diode, the control circuit can determine the state of the high-voltage connection circuit based on the other sampling branch when operating under open-circuit conditions or when one of the sampling branches fails. Furthermore, when the high-voltage connection circuit is in a short-power state, the first power supply is protected, preventing interference with the first and second sampling signals, as well as other sampling signals powered by the first power supply. This improves the stability and reliability of the battery management system, enhances its anti-interference capability, and reduces the maintenance difficulty of the battery management system.

[0184] It should be understood that those skilled in the art will recognize that this invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this invention may take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0185] It should also be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of the present invention, the sequence number of the above-described steps / processes does not imply the order of execution; the execution order of each step / process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The above-described embodiment numbers are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0186] It should be noted that, in this utility model, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0187] In the several embodiments provided by this utility model, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0188] The units described above as separate components may or may not be physically separate; the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the various embodiments of this utility model, all functional units may be integrated into one processing unit, or each unit may be a separate unit, or two or more units may be integrated into one unit; the integrated unit may be implemented in hardware or in a combination of hardware and software functional units.

[0189] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A battery management system, characterized by, The battery management system includes a first power supply, a first detection branch, a second detection branch, a first sampling branch, and a second sampling branch; wherein: The first end of the first detection branch and the first end of the second detection branch are both connected to the first power supply. The second end of the first detection branch is connected to the first sampling branch. The second end of the second detection branch is connected to the second sampling branch. The third end of the first detection branch is connected to the first port of the high-voltage connection circuit. The third end of the second detection branch is connected to the second port of the high-voltage connection circuit. The fourth end of the first detection branch and the fourth end of the second detection branch are both grounded. The first detection branch is used to output a first sampling signal to the first sampling branch, and the ratio of the voltage value of the first sampling signal to the voltage value of the first power supply is the first voltage division ratio. The second detection branch is used to output a second sampling signal to the second sampling branch, and the ratio of the voltage value of the second sampling signal to the voltage value of the first power supply is the second voltage division ratio. Wherein, the first voltage division ratio of the high-voltage connection circuit is different under different operating conditions, so that the voltage value of the first sampled signal is different; and / or, the second voltage division ratio of the high-voltage connection circuit is different under different operating conditions, so that the voltage value of the second sampled signal is different.

2. The battery management system of claim 1, wherein, The first detection branch includes a first resistor and a second resistor; wherein: The first end of the first resistor is connected to the first power supply, the second end of the first resistor is connected to the first end of the second resistor, the first sampling branch and the first port of the high voltage connection circuit respectively, and the second end of the second resistor is grounded.

3. The battery management system of claim 1, wherein, The second detection branch includes a third resistor and a fourth resistor; wherein: The first end of the third resistor is connected to the first power supply, the second end of the third resistor is connected to the first end of the fourth resistor, the second sampling branch and the second port of the high voltage connection circuit respectively, and the second end of the fourth resistor is grounded.

4. The battery management system of claim 1, wherein, The battery management system further includes a first diode and a second diode; wherein: The first end of the first diode is connected to the first power supply, and the second end of the first diode is connected to the first detection branch. The first end of the second diode is connected to the first power supply, and the second end of the second diode is connected to the second detection branch.

5. The battery management system of claim 4, wherein, The battery management system further includes a first clamping branch, a second clamping branch, and a second power supply; wherein: The first clamping branch includes a third diode and a fourth diode. The first end of the third diode is connected to the second end of the fourth diode, the second end of the first sampling branch, and the second end of the first detection branch, respectively. The second end of the third diode is connected to the second power supply, and the first end of the fourth diode is grounded. The second clamping branch includes a fifth diode and a sixth diode. The first end of the fifth diode is connected to the second end of the sixth diode, the second sampling branch, and the second detection branch, respectively. The second end of the fifth diode is connected to the second power supply, and the first end of the sixth diode is grounded.

6. The battery management system of claim 5, wherein, The battery management system further includes a first filtering branch and a second filtering branch; wherein: The first filtering branch includes a first capacitor and a fifth resistor. The first end of the fifth resistor is connected to the first end of the first capacitor and the first clamping branch, respectively. The second end of the fifth resistor is connected to the second end of the first detection branch. The second end of the first capacitor is grounded. The second filtering branch includes a second capacitor and a sixth resistor. The first end of the sixth resistor is connected to the first end of the second capacitor and the second clamping branch, respectively. The second end of the sixth resistor is connected to the second end of the second detection branch. The second end of the second capacitor is grounded.

7. The battery management system according to claim 2 or 3, characterized in that, The resistance value of the first resistor is the same as the resistance value of the fourth resistor; The resistance value of the second resistor is the same as that of the third resistor; The resistance value of the first resistor is different from the resistance value of the second resistor.

8. The battery management system of any one of claims 1-6, wherein, The battery management system further includes a third capacitor and a fourth capacitor; wherein: The first terminal of the third capacitor is connected to the third terminal of the first detection branch and the first port of the high voltage connection circuit, respectively, and the second terminal of the third capacitor is grounded. The first terminal of the fourth capacitor is connected to the third terminal of the second detection branch and the second port of the high-voltage connection circuit, respectively, and the second terminal of the fourth capacitor is grounded.

9. The battery management system of any one of claims 1-6, wherein, The battery management system further includes a high-voltage connection circuit and a control circuit. The high-voltage connection circuit is connected to the first detection branch and the second detection branch, respectively, and the control circuit is connected to the first sampling branch and the second sampling branch, respectively. The control circuit is used to determine the operating condition of the high-voltage connection circuit based on the first sampling signal provided by the first sampling branch and / or the second sampling signal provided by the second sampling branch.

10. A battery system characterized by, The battery system includes a battery management system as described in any one of claims 1-9.

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