Battery management system, control method and device thereof, storage medium and energy storage equipment

Abstract

The invention provides a battery management system, a control method and device thereof, a storage medium and energy storage equipment, and relates to the technical field of battery management. A battery management system includes: a battery pack; the first sampling unit is connected with the battery pack and is used for acquiring a first sampling signal of the battery pack; the first logic operation unit is connected with the first sampling unit; the first output unit is connected with the output end of the battery pack, and the control end of the first output unit is connected with the first logical operation unit; the second sampling unit is connected with the battery pack and is used for acquiring a second sampling signal of the battery pack; the second logical operation unit is connected with the second sampling unit; and the second output unit is connected with the output end of the battery pack, and the control end of the second output unit is connected with the second logical operation unit. According to the invention, the protection stability of the battery management system on the battery pack and the operation safety of the battery pack are improved.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, and in particular to a battery management system and a control method, device, storage medium and energy storage device thereof. Background Art

[0002] In the related art, the BMS system (Battery Management System) adopts a single-channel control method, that is, the MCU (Microcontroller Unit) samples the current, voltage, temperature and other signals of the battery pack, and then controls the on and off of the contactor to protect the battery after calculating and comparing with the threshold.

[0003] When a component in the BMS system fails, the protection function of the BMS system will fail, causing a safety accident. There is a problem that the stability of the BMS system in protecting the battery is poor. Summary of the invention

[0004] The present application aims to solve the problem of poor stability in protecting batteries in the prior art or related art.

[0005] To this end, a first aspect of the present application proposes a battery management system.

[0006] A second aspect of the present application proposes a control method.

[0007] A third aspect of the present application provides a control device.

[0008] A fourth aspect of the present application provides a control device.

[0009] A fifth aspect of the present application proposes a readable storage medium.

[0010] The sixth aspect of the present application proposes an energy storage device.

[0011] In view of this, according to the first aspect of the present application, a battery management system is proposed, including: a battery pack; a first sampling unit connected to the battery pack and used to collect a first sampling signal of the battery pack; a first logic operation unit connected to the first sampling unit; a first output unit connected to the output end of the battery pack, and the control end of the first output unit is connected to the first logic operation unit; a second sampling unit connected to the battery pack and used to collect a second sampling signal of the battery pack; a second logic operation unit connected to the second sampling unit; a second output unit connected to the output end of the battery pack, and the control end of the second output unit is connected to the second logic operation unit; wherein the first logic operation unit controls the on-off state of the first output unit according to the first sampling signal, and the second logic operation unit controls the on-off state of the second output unit according to the second sampling signal.

[0012] In this technical solution, the battery management system includes a battery pack and two independent control channels, and the two independent control channels can control the on-off state between the output end of the battery pack and the external circuit. Among them, one control channel includes a first sampling unit, a first logic operation unit and a first output unit, and the other control channel includes a second sampling unit, a second logic operation unit and a second output unit. The first output unit and the second output unit are both connected between the battery pack and the external circuit. When the first logic operation unit determines that the battery pack has a fault according to the first sampling signal, the path between the battery pack and the external circuit can be cut off through the first output unit. When the second logic operation unit determines that the battery has a fault according to the second sampling signal, the path between the battery pack and the external circuit can be cut off through the second output unit. It should be noted that the external circuit can be a load, in which case the battery pack is used to power the load, and the external circuit can also be a charging circuit, in which case the battery pack is charged by the charging circuit.

[0013] The first sampling unit, the first logic operation unit and the first output unit form a control channel, and the second sampling unit, the second logic operation unit and the second output unit form a control channel.

[0014] In this technical solution, the first sampling unit can transmit the collected first sampling signal to the first logic operation unit, and the second sampling unit can transmit the collected second sampling signal to the second logic operation unit.

[0015] It should be noted that the first sampling unit and the second sampling unit are independent of each other. When the first sampling unit fails, it will not affect the accuracy of the second sampling unit collecting the second sampling signal, and when the second sampling unit fails, it will not affect the accuracy of the first sampling unit collecting the first sampling signal.

[0016] Specifically, the first sampling unit, the first logic operation unit and the first output unit form a first control channel, and the second sampling unit, the second logic operation unit and the second output unit form a second control channel, so that the first control channel and the second control channel sample the first sampling signal and the second sampling signal through the first sampling unit and the second sampling unit respectively, to avoid the situation where both control channels fail when one of the first sampling unit and the second sampling unit fails.

[0017] In this technical solution, the first logic operation unit can control the on-off state of the first output unit, and the second logic operation unit can control the on-off state of the second output unit, wherein the control of the first output unit by the first logic operation unit and the control of the second output unit by the second logic operation unit are independent of each other, that is, the first logic operation unit and the first output unit can independently complete the safety protection function, and the second logic operation unit and the second output unit can also independently complete the safety protection function. When there is a single point failure in the first logic operation unit, the second logic operation unit, the first output unit, and the second output unit, there is at least one control channel left in the battery management system to ensure that the battery pack is in a safe state.

[0018] It should be noted that the power signal, clock signal and reference signal of the first logic operation unit are independent of the power signal, clock signal and reference signal of the second logic operation unit, so as to avoid affecting the first logic operation unit and the second logic operation unit at the same time when there is a fault in the clock signal, reference signal and power signal.

[0019] In the technical solution of the present application, by setting the first sampling unit and the second sampling unit in the sampling unit, the first sampling unit and the second sampling unit can respectively collect the first sampling signal and the second sampling signal of the battery pack, the first sampling signal and the second sampling signal are respectively transmitted to the first logic operation unit and the second logic operation unit, and the first logic operation unit and the second logic operation unit can respectively control the first output unit and the second output unit, so that the first logic operation unit and the first output unit, and the second logic operation unit and the second output unit form two independent control channels, when one of the control channels fails, the other control channel can still play a protective role, thereby improving the stability of the battery management system in protecting the battery pack and the safety of the battery pack operation. In addition, the basis for the first logic operation unit to determine whether the battery pack has a fault is the first sampling signal collected by the first sampling unit, and the basis for the second logic operation unit to determine whether the battery pack has a fault is the second sampling signal collected by the second sampling unit, further improving the independence of the first logic operation unit controlling the first output unit and the second logic operation unit controlling the second output unit, thereby further improving the stability of the battery pack protection.

[0020] In some technical solutions, optionally, the first logic operation unit is communicatively connected to the second logic operation unit, the first logic operation unit is used to transmit the first sampling signal to the second logic operation unit, and the second logic operation unit is used to transmit the second sampling signal to the first logic operation unit;

[0021] When the sampling difference between the sampling value of the first sampling signal and the sampling value of the second sampling signal is greater than the difference threshold, the first logic operation unit controls the first output unit to be disconnected, or the second logic operation unit controls the second output unit to be disconnected.

[0022] In this technical solution, the first logic operation unit is communicatively connected with the second logic operation unit. When the first logic operation unit receives the first sampling signal from the first sampling unit, and when the second logic operation unit receives the second sampling signal from the second sampling unit, the first logic operation unit transmits the first sampling signal to the second logic operation unit, and the second logic operation unit also transmits the second sampling signal to the first logic operation unit, so that the first logic operation unit and the second logic operation unit can compare the first sampling signal with the second sampling signal. When the difference between the first sampling signal and the second sampling signal is large, it is determined that there is a sampling error at this time, and the first output unit can be controlled to be disconnected by the first logic operation unit, or the second output unit can be controlled to be disconnected by the second logic operation unit, so that the battery management system enters the safety protection mode.

[0023] Specifically, since the first sampling unit and the second sampling unit are independently set sampling units, the first sampling signal and the second sampling signal collected by the two are also independent of each other. Through the communication connection between the first logic operation unit and the second logic operation unit, the first logic operation unit and the second logic operation unit can both receive the first sampling signal and the second sampling signal, and the first logic operation unit and the second logic operation unit can both compare the first sampling signal and the second sampling signal. Among them, the first logic operation unit and the second logic operation unit determine the sampling value of the first sampling signal and the sampling value of the second sampling signal, by calculating the sampling difference of the two sampling signals, and comparing the sampling difference with the difference threshold. When the sampling difference is less than or equal to the difference threshold, it is determined that the difference between the first sampling signal and the second sampling signal is not large, and it can be determined that both the first sampling unit and the second sampling unit are fault-free. When the sampling difference is greater than the difference threshold, it is determined that the difference between the first sampling signal and the second sampling signal is large, that is, at least one of the first sampling unit and the second sampling unit is faulty. Since it is impossible to determine the faulty sub-unit in the two sampling units, the first output unit or the second output unit is controlled to be disconnected to avoid protection failure caused by the inability to accurately sample the battery pack due to the failure of the sampling unit.

[0024] In the technical solution of the present application, a communication connection is set between the first logic operation unit and the second logic operation unit, and the first logic operation unit and the second logic operation unit both transmit the sampling signals they receive to each other, so that the first logic operation unit and the second logic operation unit can both compare the difference between the first sampling signal and the second sampling signal. When the difference between the first sampling signal and the second sampling signal is too large, the first output unit or the second output unit is controlled to be disconnected, which can avoid the failure of the battery pack safety protection due to inaccurate sampling of the sampling signal, and further improve the stability of the battery management system for the battery pack safety protection.

[0025] In some technical solutions, optionally, the first logic operation unit determines that the battery pack is in a fault state based on the first sampling signal, and controls the first output unit to disconnect; the second logic operation unit determines that the battery pack is in a fault state based on the second sampling signal, and delays controlling the second output unit to disconnect.

[0026] In this technical solution, after receiving the sampling signal, the first logic operation unit can compare the first sampling signal with the reference signal to determine whether the battery pack is in a faulty state. When the battery pack is detected to be in a faulty state, the first output unit is controlled to disconnect immediately to cut off the connection between the battery pack and the external circuit. After receiving the second sampling signal, the second logic operation unit can also compare the second sampling signal with the reference signal to determine whether the battery pack is in a faulty state. When the battery pack is detected to be in a faulty state, the second output unit is controlled to disconnect with a delay to cut off the connection between the battery pack and the external circuit. The reference signals received by the first logic operation unit and the second logic operation unit are the same reference signals from different reference sources.

[0027] It should be noted that the time when the first logic operation unit receives the first sampling signal is close to the time when the second logic operation unit receives the second sampling signal, and the time required for the first logic operation unit to process and compare the first sampling signal and the time required for the second logic operation unit to process and compare the second sampling signal is also close. When a battery pack fails, and the first logic operation unit, the first sampling unit, the second logic operation unit and the second sampling unit are all normal, the first logic operation unit can control the first output unit to disconnect in time. At this time, the second logic operation unit delays the control of the second output unit to disconnect, so that the action of the second output unit is staggered with the action of the first output unit, so as to avoid the second output unit from disconnecting again when the first output unit has been disconnected, so that the second output unit only performs the disconnection action when the first output unit or the second logic operation unit fails.

[0028] In the technical solution of the present application, when the first logic operation unit determines that the battery pack is in a fault state, it can immediately control the first output unit to disconnect. When the second logic operation unit determines that the battery pack is in a fault state, it delays the control of the second output unit to disconnect, so that the second output unit performs the disconnection action only when the first output unit or the second logic operation unit fails. While improving the stability of the battery management system in protecting the safety of the battery pack, it also avoids meaningless repeated control, thereby achieving a better protection effect on the battery pack.

[0029] In some technical solutions, optionally, the first sampling signal includes: a first voltage sampling signal and / or a first temperature sampling signal, and the first sampling unit includes: a first sampling chip, the sampling end of the first sampling chip is connected to the battery pack, and is used to collect the first voltage sampling signal and / or the first temperature sampling signal, and the output end of the first sampling chip is used to transmit the first sampling signal; the second sampling signal includes: a second voltage sampling signal and / or a second temperature sampling signal, and the second sampling unit includes: a second sampling chip, the sampling end of the second sampling chip is connected to the battery pack, and is used to collect the second voltage sampling signal and / or the second temperature sampling signal, and the output end of the second sampling chip is used to transmit the second sampling signal.

[0030] In this technical solution, the first sampling unit includes a first sampling chip, the sampling end of the first sampling chip is connected to the battery pack, and the first voltage sampling signal and / or the first temperature sampling signal of the battery pack can be collected through the first sampling chip. The first sampling chip is connected to the first logic operation unit, and the first voltage sampling signal and / or the first temperature sampling signal collected by the first sampling chip is transmitted to the first logic operation unit through the output end. The second sampling unit includes a second sampling chip, the sampling end of the second sampling chip is connected to the battery pack, and the second voltage sampling signal and / or the second temperature sampling signal of the battery pack can be collected through the second sampling chip. The second sampling chip is connected to the second logic operation unit, and the second voltage sampling signal and / or the second temperature sampling signal collected by the second sampling chip is transmitted to the second logic operation unit through the output end.

[0031] In some technical schemes, optionally, the number of battery packs is at least two, the number of first sampling chips is the same as the number of battery packs, and at least two first sampling chips are respectively connected to at least two battery packs; the first sampling unit also includes: a first communication circuit, a first end of the first communication circuit is connected to at least two first sampling chips, and a second end of the first communication circuit is connected to a first logic operation unit and a second logic operation unit; the number of second sampling chips is the same as the number of battery packs, and at least two second sampling chips are respectively connected to at least two battery packs; the second sampling unit also includes a second communication circuit, a first end of the second communication circuit is connected to at least two second sampling chips, and a second end of the second communication circuit is connected to a second logic operation unit.

[0032] In this technical solution, the number of battery packs is at least two, and the at least two battery packs can be connected in series or in parallel with each other. Each battery pack needs to be individually connected to a first sampling chip and a second sampling chip. By setting at least two first sampling chips and at least two second sampling chips, the first voltage sampling signal and / or the first temperature sampling signal of the at least two battery packs, as well as the second voltage sampling signal and / or the second temperature sampling signal, are collected respectively, so as to achieve monitoring of the at least two battery packs respectively. When there are at least two first sampling chips, a first communication circuit is set in the first sampling unit, and the at least two first sampling chips are connected to the first logic operation unit through the first communication circuit. When there are at least two second sampling chips, a second communication circuit is set in the second sampling unit, and the at least two second sampling chips are connected to the second logic operation unit through the second communication circuit.

[0033] In the technical solution of the present application, when there are multiple battery packs, multiple first sampling chips and second sampling chips are arranged in the sampling circuit, and multiple battery packs are sampled respectively by the multiple first sampling chips and the multiple second sampling chips, so as to improve the sampling accuracy, and the multiple first sampling chips are all connected to the first logic operation unit for communication through the first communication circuit, and the multiple second sampling chips are all connected to the second logic operation unit through the second communication circuit, so as to improve the stability of the first logic operation unit and the second logic operation unit in monitoring the multiple battery packs, and further improve the stability of the battery management system in protecting the battery pack and the safety of the battery pack operation.

[0034] In some technical solutions, optionally, the first sampling signal further includes: a first current sampling signal, the first sampling unit includes: a first current sampling element, the sampling end of the first current sampling element is connected to the output end of the battery pack, the output end of the first current sampling element is connected to the first logic operation unit, or the output end of the first current sampling element is connected to the first sampling chip, and the first current sampling element is used to transmit the first current sampling signal;

[0035] The second sampling signal also includes: a second current sampling signal, the second sampling unit includes: a second current sampling element, the sampling end of the second current sampling element is connected to the output end of the battery pack, the output end of the second current sampling element is connected to the second logic operation unit, or the output end of the second current sampling element is connected to the second sampling chip, and the output end of the second current sampling element is used to transmit the second current sampling signal.

[0036] In this technical solution, the first sampling unit also includes a first current sampling element, which is connected in series to the output end of the battery pack and can collect a first current sampling signal for the current output by the battery pack, and the signal output end of the first current sampling element is used to output the current sampling signal. The second sampling unit also includes a second current sampling element, which is connected in series to the output end of the battery pack and can collect a second current sampling signal for the current output by the battery pack, and the signal output end of the second current sampling element is used to output the current sampling signal.

[0037] In this technical solution, the output end of the first current sampling element is connected to the first logic operation unit, and the second current sampling element is connected to the second logic operation unit, so that the first current sampling signal and the second current sampling signal are directly transmitted to the first logic operation unit and the second logic operation unit respectively.

[0038] In this technical solution, the output end of the first current sampling element is connected to the first sampling chip, and the current sampling signal collected by the first current sampling element is transmitted to the first logic operation unit and the second logic operation unit through the first sampling chip.

[0039] The first current sampling element in the first sampling unit and the second current sampling element in the second sampling unit are both shunts. The shunt in the first sampling unit is connected to the first sampling chip in the first sampling unit, and the first current sampling signal is transmitted to the first logic operation unit through the first sampling chip in the first sampling unit. The shunt in the second sampling unit is connected to the second sampling chip in the second sampling unit, and the second current sampling signal is transmitted to the second logic operation unit through the second sampling chip in the second sampling unit.

[0040] The first current sampling element in the first sampling unit is a shunt, and the second current sampling element in the second sampling unit is a Hall element. The shunt in the first sampling unit is directly connected to the first logic operation unit, and the shunt transmits the collected first current sampling signal directly to the first logic operation unit. The Hall element in the second sampling unit is also directly connected to the second logic operation unit, and the Hall element transmits the collected second current sampling signal directly to the second logic operation unit.

[0041] In the technical solution of the present application, by connecting the first current sampling element and the second current sampling element at the output end of the battery pack, the first current sampling element can collect the first current sampling signal output by the battery pack and transmit the first current sampling signal to the first logic operation unit, and the second current sampling element can collect the second current sampling signal output by the battery pack and transmit the second current sampling signal to the second logic operation unit, so that the first logic operation unit and the second logic operation unit can monitor the current output by the battery pack, and when the output current of the battery pack is abnormal, the first output unit and the second output unit can be controlled to switch the connection between the output end of the battery pack and the external circuit, thereby safely protecting the battery pack.

[0042] In some technical solutions, optionally, the first output unit and the second output unit include at least one of the following: a switch tube, a relay, a contactor, a DC-DC converter, a MOS (metal-oxide semiconductor field effect transistor) tube, and a controllable fuse.

[0043] In the technical solution of the present application, both the first output unit and the second output unit are selected to be elements that can be controlled to be on and off, and the elements corresponding to the first output unit and the second output unit can be the same or different, thereby improving the flexibility of the battery management system configuration.

[0044] The first output unit is selected as a MOS tube, and the second output unit is selected as a controllable fuse.

[0045] The first output unit is selected as the main contactor of the battery management system, thereby reusing the original components in the battery management system and reducing the hardware cost of the battery management system. The second output unit is selected as a controllable fuse.

[0046] In some technical solutions, optionally, the battery management system also includes: a first power supply connected to the first logic operation unit and used to power the first logic operation unit; a first clock source connected to the first logic operation unit and used to provide a first clock signal to the first logic operation unit; a first reference source connected to the first logic operation unit and used to provide a first reference signal to the first logic operation unit, so that the first logic operation unit determines the fault state of the battery pack based on the first sampling signal and the first reference signal; a second power supply connected to the second logic operation unit and used to power the second logic operation unit; a second clock source connected to the second logic operation unit and used to provide a second clock signal to the second logic operation unit; a second reference source connected to the second logic operation unit and used to provide a second reference signal to the second logic operation unit, so that the second logic operation unit determines the fault state of the battery pack based on the second sampling signal and the second reference signal.

[0047] In this technical solution, the first logic operation unit is connected to the first power supply, the first clock source and the first reference source, and the first power supply, the first clock source and the first reference source provide the first logic operation unit with a power supply signal, a clock signal and a reference signal. The second logic operation unit is connected to the second power supply, the second clock source and the second reference source, and the second power supply, the second clock source and the second reference source provide the second logic operation unit with a power supply signal, a clock signal and a reference signal.

[0048] In the technical solution of the present application, by independently supplying power to the first logic operation unit and independently transmitting clock signals and reference signals, the situation in which the battery management system fails to protect the battery pack due to problems with any of the power supply signals, clock signals and reference signals in the first logic operation unit or the second logic operation unit is avoided, thereby ensuring the safety of the first logic operation unit and the second logic operation unit in the event of a common cause failure.

[0049] According to a second aspect of the present application, a control method is proposed, which is applied to the battery management system in any of the above technical solutions. The control method includes:

[0050] The first logic operation unit obtains a first sampling signal through the first sampling unit, and the second logic operation unit obtains a second sampling signal through the second sampling unit;

[0051] The first logic operation unit controls the on-off state of the first output unit according to the first sampling signal, and the second logic operation unit controls the on-off state of the second output unit according to the second sampling signal.

[0052] In this technical solution, the battery management system includes a battery pack and two independent control channels, and the two independent control channels can control the on-off state between the output end of the battery pack and the external circuit. Among them, one control channel includes a first sampling unit, a first logic operation unit and a first output unit, and the other control channel includes a second sampling unit, a second logic operation unit and a second output unit. The first output unit and the second output unit are both connected between the battery pack and the external circuit. When the first logic operation unit determines that the battery pack has a fault according to the first sampling signal, the path between the battery pack and the external circuit can be cut off through the first output unit. When the second logic operation unit determines that the battery pack has a fault according to the second sampling signal, the path between the battery pack and the external circuit can be cut off through the second output unit. It should be noted that the external circuit can be a load, in which case the battery pack is used to power the load, and the external circuit can also be a charging circuit, in which case the battery pack is charged by the charging circuit.

[0053] In this technical solution, the first sampling unit and the second sampling unit can respectively collect the first sampling signal and the second sampling signal at the battery pack, the first sampling unit can transmit the first sampling signal to the first logic operation unit, the second sampling unit can transmit the second sampling signal to the second logic operation unit, the first logic operation unit can control the on-off state of the first output unit, and the second logic operation unit can control the on-off state of the second output unit, wherein the control of the first output unit by the first logic operation unit and the control of the second output unit by the second logic operation unit are independent of each other, and the sampling processes of the first sampling unit and the second sampling unit are also independent of each other, that is, the first sampling unit, the first logic operation unit and the first output unit can independently complete the safety protection function, and the second sampling unit, the second logic operation unit and the second output unit can also independently complete the safety protection function. When there is a single point failure in the first sampling unit, the second sampling unit, the first logic operation unit, the second logic operation unit, the first output unit and the second output unit, at least one control channel remains in the battery management system to ensure that the battery pack is in a safe state.

[0054] In the technical solution of the present application, by setting a first sampling unit and a second sampling unit in the battery management system, the first sampling signal collected by the first sampling unit and the second sampling signal collected by the second sampling unit are respectively transmitted to the first logic operation unit and the second logic operation unit, and the first logic operation unit and the second logic operation unit can respectively control the first output unit and the second output unit, so that the first logic operation unit and the first output unit, and the second logic operation unit and the second output unit form two independent control channels, when one of the control channels fails, the other control channel can still play a protective role, thereby improving the stability of the battery management system in protecting the battery pack and the safety of the battery pack operation. In addition, the basis for the first logic operation unit to determine whether the battery pack has a fault is the first sampling signal collected by the first sampling unit, and the basis for the second logic operation unit to determine whether the battery pack has a fault is the second sampling signal collected by the second sampling unit, further improving the independence of the first logic operation unit controlling the first output unit and the second logic operation unit controlling the second output unit, thereby further improving the stability of the battery pack protection.

[0055] In some technical solutions, optionally, the first logic operation unit controls the on-off state of the first output unit according to the first sampling signal, and the second logic operation unit controls the on-off state of the second output unit according to the second sampling signal, including:

[0056] The first logic operation unit determines that the battery pack is in a fault state based on the first sampling signal, and controls the first output unit to disconnect;

[0057] The second logic operation unit determines that the battery pack is in a fault state based on the second sampling signal, and delays the control of the second output unit to disconnect.

[0058] In this technical solution, after receiving the first sampling signal, the first logic operation unit can compare the first sampling signal with the reference signal to determine whether the battery pack is in a faulty state. When the battery pack is detected to be in a faulty state, the first output unit is controlled to disconnect immediately to cut off the connection between the battery pack and the external circuit. After receiving the second sampling signal, the second logic operation unit can also compare the second sampling signal with the reference signal to determine whether the battery pack is in a faulty state. When the battery pack is detected to be in a faulty state, the second output unit is controlled to disconnect with a delay to cut off the connection between the battery pack and the external circuit.

[0059] It should be noted that the sampling unit is connected to the first logic operation unit and the second logic operation unit, so the time when the first logic operation unit receives the first sampling signal is close to the time when the second logic operation unit receives the second sampling signal, and the time required for the first logic operation unit to process and compare the first sampling unit is also close to the time required for the second logic operation unit to process and compare the second sampling signal. When the battery pack fails, and the first logic operation unit, the second logic operation unit, the first sampling unit and the second sampling unit are all normal, the first logic operation unit can control the first output unit to disconnect in time. At this time, the second logic operation unit delays the control of the second output unit to disconnect, so that the action of the second output unit is staggered with the action of the first output unit, avoiding the second output unit from disconnecting again when the first output unit has been disconnected, so that the second output unit only performs the disconnection action when the first output unit or the second logic operation unit fails.

[0060] In the technical solution of the present application, when the first logic operation unit determines that the battery pack is in a fault state, it can immediately control the first output unit to disconnect. When the second logic operation unit determines that the battery pack is in a fault state, it delays the control of the second output unit to disconnect, so that the second output unit performs the disconnection action only when the first output unit or the second logic operation unit fails. While improving the stability of the battery management system in protecting the safety of the battery pack, it also avoids meaningless repeated control, thereby achieving a better protection effect on the battery pack.

[0061] In some technical solutions, optionally, after the first logic operation unit acquires the first sampling signal through the first sampling unit, and the second logic operation unit acquires the second sampling signal through the second sampling unit, the control method further includes:

[0062] The first logic operation unit transmits a first sampling signal to the second logic operation unit, and the second logic operation unit transmits a second sampling signal to the first logic operation unit;

[0063] When the sampling difference between the sampling value of the first sampling signal and the sampling value of the second sampling signal is greater than the difference threshold, the first logic operation unit controls the first output unit to be disconnected, or the second logic operation unit controls the second output unit to be disconnected.

[0064] In this technical solution, the first logic operation unit is communicatively connected with the second logic operation unit. When the first logic operation unit receives the first sampling signal from the first sampling unit, and when the second logic operation unit receives the second sampling signal from the second sampling unit, the first logic operation unit transmits the first sampling signal to the second logic operation unit, and the second logic operation unit also transmits the second sampling signal to the first logic operation unit, so that the first logic operation unit and the second logic operation unit can compare the first sampling signal with the second sampling signal. When the difference between the first sampling signal and the second sampling signal is large, it is determined that there is a sampling error at this time, and the first output unit can be controlled to be disconnected by the first logic operation unit, or the second output unit can be controlled to be disconnected by the second logic operation unit, so that the battery management system enters the safety protection mode.

[0065] In the technical solution of the present application, a communication connection is set between the first logic operation unit and the second logic operation unit, and the first logic operation unit and the second logic operation unit both transmit the sampling signals they receive to each other, so that the first logic operation unit and the second logic operation unit can both compare the difference between the first sampling signal and the second sampling signal. When the difference between the first sampling signal and the second sampling signal is too large, the first output unit or the second output unit is controlled to be disconnected, which can avoid the failure of the battery pack safety protection due to inaccurate sampling of the sampling signal, and further improve the stability of the battery management system for the battery pack safety protection.

[0066] According to a third aspect of the present application, a control device is provided, which is applied to the battery management system in any of the above technical solutions, and the control device includes:

[0067] An acquisition module, used for acquiring a first sampling signal and a second sampling signal;

[0068] The control module is used to control the on-off state of the first output unit according to the first sampling signal, and to control the on-off state of the second output unit according to the second sampling signal.

[0069] In this technical solution, the acquisition module includes a first sampling unit and a second sampling unit in the battery management system, and the control module includes a first logic operation unit and a second logic operation unit in the battery management system.

[0070] In the technical solution of the present application, by setting a first sampling unit and a second sampling unit in the battery management system, the first sampling signal collected by the first sampling unit and the second sampling signal collected by the second sampling unit are respectively transmitted to the first logic operation unit and the second logic operation unit, and the first logic operation unit and the second logic operation unit can respectively control the first output unit and the second output unit, so that the first logic operation unit and the first output unit, and the second logic operation unit and the second output unit form two independent control channels, when one of the control channels fails, the other control channel can still play a protective role, thereby improving the stability of the battery management system in protecting the battery pack and the safety of the battery pack operation. In addition, the basis for the first logic operation unit to determine whether the battery pack has a fault is the first sampling signal collected by the first sampling unit, and the basis for the second logic operation unit to determine whether the battery pack has a fault is the second sampling signal collected by the second sampling unit, further improving the independence of the first logic operation unit controlling the first output unit and the second logic operation unit controlling the second output unit, thereby further improving the stability of the battery pack protection.

[0071] According to the fourth aspect of the present application, a control device is proposed, the control device includes a processor and a memory, the memory stores a program or instruction, and the program or instruction is executed by the processor to implement the steps of the control method in any of the above technical solutions. Therefore, the control device has all the beneficial effects of the control method in any of the above technical solutions, which will not be repeated here.

[0072] According to the fifth aspect of the present application, a readable storage medium is proposed, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the control method in any of the above-mentioned technical solutions are implemented, thereby having all the beneficial technical effects of the control method in any of the above-mentioned technical solutions.

[0073] According to the sixth aspect of the present application, an energy storage device is proposed, including: a battery management system in any of the above-mentioned technical solutions; and / or a control device in any of the above-mentioned technical solutions; and / or a readable storage medium in any of the above-mentioned technical solutions, thereby having all the beneficial technical effects of the battery management system in any of the above-mentioned technical solutions; and / or the control device in any of the above-mentioned technical solutions; and / or the readable storage medium in any of the above-mentioned technical solutions, which will not be repeated here.

[0074] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0076] Figure 1 One of the circuit topology diagrams of a battery management system provided in some embodiments of the present application is shown;

[0077] Figure 2 A second circuit topology diagram of a battery management system provided in some embodiments of the present application is shown;

[0078] Figure 3 A third circuit topology diagram of a battery management system provided in some embodiments of the present application is shown;

[0079] Figure 4 A schematic flow chart of a control method provided in some embodiments of the present application is shown;

[0080] Figure 5 One of the structural block diagrams of a control device provided in some embodiments of the present application is shown;

[0081] Figure 6 A second structural block diagram of a control device is shown in some embodiments of the present application;

[0082] Figure 7 A structural block diagram of an energy storage device is shown in some embodiments of the present application.

[0083] The reference numerals are as follows:

[0084] 100 battery management system, 110 battery pack, 121 first sampling unit, 122 second sampling unit, 123 first sampling chip, 124 first communication circuit, 125 first current sampling element, 126 second sampling chip, 127 second communication circuit, 128 second current sampling element, 130 first logic operation unit, 131 first power supply, 132 first clock source, 133 first reference source, 140 second logic operation unit, 141 second power supply, 142 second clock source, 143 second reference source, 150 first output unit, 160 second output unit. DETAILED DESCRIPTION

[0085] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, in the absence of conflict, the present embodiment and the features in the embodiment can be combined with each other.

[0086] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0087] Refer to the following Figures 1 to 7 A battery management system and a control method, apparatus, storage medium, and energy storage device thereof according to some embodiments of the present application are described.

[0088] According to one embodiment of the present application, Figure 1 One of the circuit topology diagrams of a battery management system provided in some embodiments of the present application is shown. Figure 2 FIG2 shows a second circuit topology diagram of a battery management system provided in some embodiments of the present application. Figure 3 FIG. 3 shows a circuit topology diagram of a battery management system provided in some embodiments of the present application, such as Figures 1 to 3 As shown, a battery management system 100 is proposed, including: a battery pack 110 , a first sampling unit 121 , a second sampling unit 122 , a first logic operation unit 130 , a second logic operation unit 140 , a first output unit 150 and a second output unit 160 .

[0089] The first sampling unit 121 is connected to the battery pack 110 and is used to collect a first sampling signal of the battery pack 110; the first logic operation unit 130 is connected to the first sampling unit 121; the first output unit 150 is connected to the output end of the battery pack 110, and the control end of the first output unit 150 is connected to the first logic operation unit 130; the second sampling unit 122 is connected to the battery pack 110 and is used to collect a second sampling signal of the battery pack 110; the second logic operation unit 140 is connected to the second sampling unit 122; the second output unit 160 is connected to the output end of the battery pack 110, and the control end of the second output unit 160 is connected to the second logic operation unit 140; wherein the first logic operation unit 130 controls the on-off state of the first output unit 150 according to the first sampling signal, and the second logic operation unit 140 controls the on-off state of the second output unit 160 according to the second sampling signal.

[0090] In this embodiment, the battery management system 100 includes a battery pack 110 and two independent control channels, which can control the on / off state between the output end of the battery pack 110 and the external circuit. One control channel includes a first sampling unit 121, a first logic operation unit 130 and a first output unit 150, and the other control channel includes a second sampling unit 122, a second logic operation unit 140 and a second output unit 160. The first output unit 150 and the second output unit 160 are both connected between the battery pack 110 and the external circuit. When the first logic operation unit 130 determines that the battery pack 110 has a fault according to the first sampling signal, the first output unit 150 can cut off the path between the battery pack 110 and the external circuit. When the second logic operation unit 140 determines that the battery pack 110 has a fault according to the second sampling signal, the second output unit 160 can cut off the path between the battery pack 110 and the external circuit. It should be noted that the external circuit may be a load, in which case the battery pack 110 is used to supply power to the load. The external circuit may also be a charging circuit, in which case the battery pack 110 is charged by the charging circuit.

[0091] Among them, Figure 2 and Figure 3 As shown, MCU1 is the first logic operation unit 130 , and MCU2 is the second logic operation unit 140 .

[0092] like Figure 1 As shown, the first sampling unit 121 , the first logic operation unit 130 and the first output unit 150 form a control channel 1 , and the second sampling unit 122 , the second logic operation unit 140 and the second output unit 160 form a control channel 2 .

[0093] Exemplarily, the first output unit 150 is connected between the positive electrode of the battery pack 110 and the external circuit, and the second output unit 160 is connected between the negative electrode of the battery pack 110 and the external circuit. The first output unit 150 and the second output unit 160 are both switch circuits, such as switch tubes, contactors, etc.

[0094] Exemplarily, the first logic operation unit 130 and the second logic operation unit 140 may be MCUs.

[0095] In this embodiment, the first sampling unit 121 can transmit the collected first sampling signal to the first logic operation unit 130 , and the second sampling unit 122 can transmit the collected second sampling signal to the second logic operation unit 140 .

[0096] It should be noted that the first sampling unit 121 and the second sampling unit 122 are independent of each other. When the first sampling unit 121 fails, it will not affect the accuracy of the second sampling unit 122 collecting the second sampling signal. When the second sampling unit 122 fails, it will not affect the accuracy of the first sampling unit 121 collecting the first sampling signal.

[0097] Specifically, the first sampling unit 121, the first logic operation unit 130 and the first output unit 150 form a first control channel, and the second sampling unit 122, the second logic operation unit 140 and the second output unit 160 form a second control channel, so that the first control channel and the second control channel sample the first sampling signal and the second sampling signal through the first sampling unit 121 and the second sampling unit 122 respectively, to avoid the situation where both control channels fail when one of the first sampling unit 121 and the second sampling unit 122 fails.

[0098] In this embodiment, the first logic operation unit 130 can control the on / off state of the first output unit 150, and the second logic operation unit 140 can control the on / off state of the second output unit 160, wherein the control of the first output unit 150 by the first logic operation unit 130 and the control of the second output unit 160 by the second logic operation unit 140 are independent of each other, that is, the first logic operation unit 130 and the first output unit 150 can independently complete the safety protection function, and the second logic operation unit 140 and the second output unit 160 can also independently complete the safety protection function. When there is a single point failure in the first logic operation unit 130, the second logic operation unit 140, the first output unit 150 and the second output unit 160, at least one control channel remains in the battery management system 100 to ensure that the battery pack 110 is in a safe state.

[0099] For example, when there is a single point failure in the first output unit 150, the first logic operation unit 130 determines that there is a failure in the battery pack 110 according to the sampling signal, and the first logic operation unit 130 cannot control the first output unit 150 to perform the on-off action, or when there is a single point failure in the first logic operation unit 130, the first logic operation unit 130 cannot determine that there is a failure in the battery pack 110 according to the sampling signal. Since the second logic operation unit 140 can operate independently for the second output unit 160, the second logic operation unit 140 can also determine that there is a failure in the battery pack 110 according to the sampling signal, and the second logic operation unit 140 controls the second output unit 160 to disconnect, so that the output end of the battery pack 110 can be disconnected from the external circuit, ensuring that the battery pack 110 is in a safe state.

[0100] For example, when there is a single point fault in the second output unit 160, the second logic operation unit 140 determines that there is a fault in the battery pack 110 according to the sampling signal, and the second logic operation unit 140 cannot control the second output unit 160 to perform the on-off action, or when there is a single point fault in the second logic operation unit 140, the second logic operation unit 140 cannot determine that there is a fault in the battery pack 110 according to the sampling signal. Since the first logic operation unit 130 can operate independently of the first output unit 150, the first logic operation unit 130 can also determine that there is a fault in the battery pack 110 according to the sampling signal, and the first logic operation unit 130 controls the first output unit 150 to disconnect, so that the output end of the battery pack 110 can be disconnected from the external circuit, ensuring that the battery pack 110 is in a safe state.

[0101] It should be noted that the power signal, clock signal and reference signal of the first logic operation unit 130 are independent of the power signal, clock signal and reference signal of the second logic operation unit 140, so as to avoid affecting both the first logic operation unit 130 and the second logic operation unit 140 when a fault occurs in the clock signal, reference signal and power signal.

[0102] In the embodiment of the present application, the first sampling signal and the second sampling signal of the battery pack 110 can be collected respectively through the first sampling unit 121 and the second sampling unit 122, and the first sampling signal and the second sampling signal are transmitted to the first logic operation unit 130 and the second logic operation unit 140 respectively, and the first logic operation unit 130 and the second logic operation unit 140 can respectively control the first output unit 150 and the second output unit 160, so that the first logic operation unit 130 and the first output unit 150, and the second logic operation unit 140 and the second output unit 160 form two independent control channels. When one of the control channels fails, the other control channel can still play a protective role, thereby improving the stability of the battery management system 100 in protecting the battery pack 110 and the safety of the operation of the battery pack 110. In addition, the first logic operation unit 130 determines whether the battery pack 110 has a fault based on the first sampling signal collected by the first sampling unit 121, and the second logic operation unit 140 determines whether the battery pack 110 has a fault based on the second sampling signal collected by the second sampling unit 122, which further improves the independence of the first logic operation unit 130 controlling the first output unit 150 and the second logic operation unit 140 controlling the second output unit 160, thereby further improving the stability of the protection of the battery pack 110.

[0103] like Figure 1 , Figure 2 and Figure 3As shown, in some embodiments, optionally, the first logic operation unit 130 is communicatively connected with the second logic operation unit 140, the first logic operation unit 130 is used to transmit the first sampling signal to the second logic operation unit 140, and the second logic operation unit 140 is used to transmit the second sampling signal to the first logic operation unit 130;

[0104] When the sampling difference between the sampling value of the first sampling signal and the sampling value of the second sampling signal is greater than the difference threshold, the first logic operation unit 130 controls the first output unit 150 to be disconnected, or the second logic operation unit 140 controls the second output unit 160 to be disconnected.

[0105] In this embodiment, the first logic operation unit 130 is communicatively connected with the second logic operation unit 140. When the first logic operation unit 130 receives the first sampling signal from the first sampling unit 121 and the second logic operation unit 140 receives the second sampling signal from the second sampling unit 122, the first logic operation unit 130 transmits the first sampling signal to the second logic operation unit 140, and the second logic operation unit 140 also transmits the second sampling signal to the first logic operation unit 130, so that the first logic operation unit 130 and the second logic operation unit 140 can compare the first sampling signal with the second sampling signal. When the difference between the first sampling signal and the second sampling signal is large, it is determined that there is a sampling error at this time, and the first output unit 150 can be controlled to be disconnected by the first logic operation unit 130, or the second output unit 160 can be controlled to be disconnected by the second logic operation unit 140, so that the battery management system 100 enters the safety protection mode.

[0106] Exemplarily, the first logic operation unit 130 and the second logic operation unit 140 may be communicatively connected via a communication bus, or the first logic operation unit 130 and the second logic operation unit 140 may be directly communicatively connected via a signal line.

[0107] Specifically, since the first sampling unit 121 and the second sampling unit 122 are independently set sampling units, the first sampling signal and the second sampling signal collected by the two are also independent of each other. Through the communication connection between the first logic operation unit 130 and the second logic operation unit 140, the first logic operation unit 130 and the second logic operation unit 140 can both receive the first sampling signal and the second sampling signal, and the first logic operation unit 130 and the second logic operation unit 140 can both compare the first sampling signal and the second sampling signal. Among them, the first logic operation unit 130 and the second logic operation unit 140 determine the sampling value of the first sampling signal and the sampling value of the second sampling signal, by calculating the sampling difference between the two sampling signals, and comparing the sampling difference with the difference threshold. When the sampling difference is less than or equal to the difference threshold, it is determined that the difference between the first sampling signal and the second sampling signal is not large, and it can be determined that the first sampling unit 121 and the second sampling unit 122 are both fault-free. When the sampling difference is greater than the difference threshold, it is determined that the difference between the first sampling signal and the second sampling signal is large, that is, at least one of the first sampling unit 121 and the second sampling unit 122 is faulty. Since it is impossible to determine the faulty sub-unit in the two sampling units, the first output unit 150 or the second output unit 160 is controlled to be disconnected to avoid protection failure caused by the inability to accurately sample the battery pack 110 due to the failure of the sampling unit.

[0108] In the embodiment of the present application, a communication connection is set between the first logic operation unit 130 and the second logic operation unit 140, and the first logic operation unit 130 and the second logic operation unit 140 both transmit the sampling signals they receive to each other, so that the first logic operation unit 130 and the second logic operation unit 140 can both compare the difference between the first sampling signal and the second sampling signal. When the difference between the first sampling signal and the second sampling signal is too large, the first output unit 150 or the second output unit 160 is controlled to be disconnected, which can avoid the failure of the safety protection of the battery pack 110 due to inaccurate sampling of the sampling signal, and further improve the stability of the battery management system 100 for the safety protection of the battery pack 110.

[0109] In some embodiments, optionally, the first logic operation unit 130 determines that the battery pack 110 is in a fault state based on the first sampling signal, and controls the first output unit 150 to disconnect; the second logic operation unit 140 determines that the battery pack 110 is in a fault state based on the second sampling signal, and delays controlling the second output unit 160 to disconnect.

[0110] In this embodiment, after receiving the sampling signal, the first logic operation unit 130 can compare the first sampling signal with the reference signal to determine whether the battery pack 110 is in a fault state. When the battery pack 110 is detected to be in a fault state, the first output unit 150 is controlled to be disconnected immediately to cut off the connection between the battery pack 110 and the external circuit. After receiving the second sampling signal, the second logic operation unit 140 can also compare the second sampling signal with the reference signal to determine whether the battery pack 110 is in a fault state. When the battery pack 110 is detected to be in a fault state, the second output unit 160 is controlled to be disconnected with a delay to cut off the connection between the battery pack 110 and the external circuit. The reference signals received by the first logic operation unit 130 and the second logic operation unit 140 are the same reference signals from different reference sources.

[0111] It should be noted that the time when the first logic operation unit 130 receives the first sampling signal is close to the time when the second logic operation unit 140 receives the second sampling signal, and the time required for the first logic operation unit 130 to process and compare the first sampling signal and the second logic operation unit 140 to process and compare the second sampling signal is also close. When the battery pack 110 fails, and the first logic operation unit 130, the first sampling unit 121, the second logic operation unit 140 and the second sampling unit 122 are all normal, the first logic operation unit 130 can timely control the first output unit 150 to disconnect. At this time, the second logic operation unit 140 delays the control of the second output unit 160 to disconnect, so that the action of the second output unit 160 is staggered with the action of the first output unit 150, so as to avoid the second output unit 160 from disconnecting again when the first output unit 150 has been disconnected, so that the second output unit 160 performs the disconnection action only when the first output unit 150 or the second logic operation unit 140 fails.

[0112] like Figure 2 and Figure 3 As shown, exemplarily, the first output unit 150 may be selected as a switching element capable of repeatedly switching on and off states, and the second output unit 160 may be a switching element such as a controllable fuse that can only execute the on and off states once. By delaying the melting of the controllable fuse, the controllable fuse will only melt when the first output unit 150 or the first logic operation unit 130 fails, thereby improving the economy of the battery management system 100.

[0113] In the embodiment of the present application, when the first logic operation unit 130 determines that the battery pack 110 is in a fault state, it can immediately control the first output unit 150 to disconnect. When the second logic operation unit 140 determines that the battery pack 110 is in a fault state, it delays the control of the second output unit 160 to disconnect, so that the second output unit 160 performs the disconnection action only when the first output unit 150 or the second logic operation unit 140 fails. While improving the stability of the battery management system 100 in protecting the safety of the battery pack 110, it also avoids meaningless repeated control, thereby achieving a better protection effect on the battery pack 110.

[0114] like Figure 2 and Figure 3 As shown, in some embodiments, optionally, the first sampling signal includes: a first voltage sampling signal and / or a first temperature sampling signal, and the first sampling unit 121 includes: a first sampling chip 123, the sampling end of the first sampling chip 123 is connected to the battery pack 110, and is used to collect the first voltage sampling signal and / or the first temperature sampling signal, and the output end of the first sampling chip 123 is used to transmit the first sampling signal; the second sampling signal includes: a second voltage sampling signal and / or a second temperature sampling signal, and the second sampling unit 122 includes: a second sampling chip 126, the sampling end of the second sampling chip 126 is connected to the battery pack 110, and is used to collect the second voltage sampling signal and / or the second temperature sampling signal, and the output end of the second sampling chip 126 is used to transmit the second sampling signal.

[0115] In this embodiment, the first sampling unit 121 includes a first sampling chip 123, the sampling end of the first sampling chip 123 is connected to the battery pack 110, and the first voltage sampling signal and / or the first temperature sampling signal of the battery pack 110 can be collected through the first sampling chip 123. The first sampling chip 123 is connected to the first logic operation unit 130, and the first voltage sampling signal and / or the first temperature sampling signal collected by the first sampling chip 123 are transmitted to the first logic operation unit 130 through the output end. The second sampling unit 122 includes a second sampling chip 126, the sampling end of the second sampling chip 126 is connected to the battery pack 110, and the second voltage sampling signal and / or the second temperature sampling signal of the battery pack 110 can be collected through the second sampling chip 126. The second sampling chip 126 is connected to the second logic operation unit 140, and the second voltage sampling signal and / or the second temperature sampling signal collected by the second sampling chip 126 are transmitted to the second logic operation unit 140 through the output end. Exemplarily, both the first sampling chip 123 and the second sampling chip 126 may be AFE (Active Front End) chips, and the first sampling chip 123 and the second sampling chip 126 can actively collect voltage sampling signals and / or temperature sampling signals of the battery pack 110 .

[0116] like Figure 2 As shown, for example, the first sampling chip 123 in the first sampling unit 121 is AFE1, and the second sampling chip 126 in the second sampling unit 122 is AFE2.

[0117] In the embodiment of the present application, by respectively providing the first sampling chip 123 and the second sampling chip 126 in the first sampling unit 121 and the second sampling unit 122, the first sampling unit 121 can collect the first temperature sampling signal and the first voltage sampling signal of the battery pack 110, and the second sampling unit 122 can collect the second temperature sampling signal and the second voltage sampling signal of the battery pack 110. When a single point failure occurs in one of the first sampling unit 121 and the second sampling unit 122, the corresponding signal can be collected by the other one, so that the first logic operation unit 130 and the second logic operation unit 140 can monitor the voltage and temperature of the battery pack 110. When the voltage and / or temperature of the battery pack 110 is abnormal, the first output unit 150 and the second output unit 160 can be controlled to switch the connection between the output end of the battery pack 110 and the external circuit, so as to safely protect the battery pack 110.

[0118] like Figure 3 As shown, in some embodiments, optionally, the number of battery packs 110 is at least two, the number of first sampling chips 123 is the same as the number of battery packs 110, and at least two first sampling chips 123 are respectively connected to at least two battery packs 110; the first sampling unit 121 also includes: a first communication circuit 124, a first end of the first communication circuit 124 is connected to at least two first sampling chips 123, and a second end of the first communication circuit 124 is connected to the first logic operation unit 130 and the second logic operation unit 140; the number of second sampling chips 126 is the same as the number of battery packs 110, and at least two second sampling chips 126 are respectively connected to at least two battery packs 110; the second sampling unit 122 also includes a second communication circuit 127, a first end of the second communication circuit 127 is connected to at least two second sampling chips 126, and a second end of the second communication circuit 127 is connected to the second logic operation unit 140.

[0119] In this embodiment, the number of battery packs 110 is at least two, and the at least two battery packs 110 can be connected in series or in parallel. Each battery pack 110 needs to be connected to a first sampling chip 123 and a second sampling chip 126 separately. By setting at least two first sampling chips 123 and at least two second sampling chips 126 to respectively collect the first voltage sampling signal and / or the first temperature sampling signal of the at least two battery packs 110, and the second voltage sampling signal and / or the second temperature sampling signal, at least two battery packs 110 are monitored separately. When there are at least two first sampling chips 123, a first communication circuit 124 is set in the first sampling unit 121, and the at least two first sampling chips 123 are connected to the first logic operation unit 130 through the first communication circuit 124. When there are at least two second sampling chips 126, a second communication circuit 127 is set in the second sampling unit 122, and the at least two second sampling chips 126 are connected to the second logic operation unit 140 through the second communication circuit 127.

[0120] like Figure 3 As shown, exemplarily, the number of battery packs 110 is 3, and the three battery packs 110 are respectively connected to three first sampling chips 123, specifically including: AFE11, AFE12, AFE13, and the three first sampling chips 123 are all connected to the first logic operation unit 130 through the first communication circuit 124. The three battery packs 110 are respectively connected to three second sampling chips 126, specifically including: AFE21, AFE22, AFE23, and the three second sampling chips 126 are all connected to the second logic operation unit 140 through the second communication circuit 127. Among them, AFE11, AFE12, AF13, the first logic operation unit 130 and the first output unit 150 are control channel 1, and AFE21, AFE22, AF23, the second logic operation unit 140 and the second output unit 160 are control channel 2.

[0121] In the embodiment of the present application, when there are multiple battery packs 110, multiple first sampling chips 123 and second sampling chips 126 are set in the sampling circuit, and the multiple battery packs 110 are sampled respectively by the multiple first sampling chips 123 and the multiple second sampling chips 126, so as to improve the sampling accuracy, and the multiple first sampling chips 123 are all connected to the first logic operation unit 130 through the first communication circuit 124 for communication, and the multiple second sampling chips 126 are all connected to the second logic operation unit 140 through the second communication circuit 127, so as to improve the stability of the first logic operation unit 130 and the second logic operation unit 140 in monitoring the multiple battery packs 110, further improve the stability of the battery management system 100 in protecting the battery pack 110, and the safety of the operation of the battery pack 110.

[0122] like Figure 2 and Figure 3 As shown, in some embodiments, optionally, the first sampling signal further includes: a first current sampling signal, the first sampling unit 121 includes: a first current sampling element 125, the sampling end of the first current sampling element 125 is connected to the output end of the battery pack 110, the output end of the first current sampling element 125 is connected to the first logic operation unit 130, or the output end of the first current sampling element 125 is connected to the first sampling chip 123, and the first current sampling element 125 is used to transmit the first current sampling signal;

[0123] The second sampling signal also includes: a second current sampling signal. The second sampling unit 122 includes: a second current sampling element 128. The sampling end of the second current sampling element 128 is connected to the output end of the battery pack. The output end of the second current sampling element 128 is connected to the second logic operation unit 140, or the output end of the second current sampling element 128 is connected to the second sampling chip 126. The output end of the second current sampling element 128 is used to transmit the second current sampling signal.

[0124] In this embodiment, the first sampling unit 121 further includes a first current sampling element 125, which is connected in series to the output end of the battery pack 110 and can collect a first current sampling signal for the current output by the battery pack 110, and the signal output end of the first current sampling element 125 is used to output the current sampling signal. The second sampling unit 122 further includes a second current sampling element 128, which is connected in series to the output end of the battery pack 110 and can collect a second current sampling signal for the current output by the battery pack 110, and the signal output end of the second current sampling element 128 is used to output the current sampling signal.

[0125] Exemplarily, the first current sampling element 125 and the second current sampling element 128 may be at least one of a Hall sensor and a shunt.

[0126] In this embodiment, the output end of the first current sampling element 125 is connected to the first logic operation unit 130, and the second current sampling element 128 is connected to the second logic operation unit 140, so that the first current sampling signal and the second current sampling signal are directly transmitted to the first logic operation unit 130 and the second logic operation unit 140 respectively.

[0127] In this embodiment, the output end of the first current sampling element 125 is connected to the first sampling chip 123 , and the current sampling signal collected by the first current sampling element 125 is transmitted to the first logic operation unit 130 and the second logic operation unit 140 through the first sampling chip 123 .

[0128] like Figure 2 As shown, the first current sampling element 125 in the first sampling unit 121 and the second current sampling element 128 in the second sampling unit 122 are both shunts. The shunt in the first sampling unit 121 is connected to the first sampling chip 123 in the first sampling unit 121, and the first current sampling signal is transmitted to the first logic operation unit 130 through the first sampling chip 123 in the first sampling unit 121. The shunt in the second sampling unit 122 is connected to the second sampling chip 126 in the second sampling unit 122, and the second current sampling signal is transmitted to the second logic operation unit 140 through the second sampling chip 126 in the second sampling unit 122.

[0129] like Figure 3 As shown, the first current sampling element 125 in the first sampling unit 121 is a shunt, and the second current sampling element 128 in the second sampling unit 122 is a Hall element. The shunt in the first sampling unit 121 is directly connected to the first logic operation unit 130, and the shunt transmits the collected first current sampling signal directly to the first logic operation unit 130. The Hall element in the second sampling unit 122 is also directly connected to the second logic operation unit 140, and the Hall element transmits the collected second current sampling signal directly to the second logic operation unit 140.

[0130] In the embodiment of the present application, by connecting the first current sampling element 125 and the second current sampling element 128 at the output end of the battery pack 110, the first current sampling element 125 can collect the first current sampling signal output by the battery pack 110, and transmit the first current sampling signal to the first logic operation unit 130, and the second current sampling element 128 can collect the second current sampling signal output by the battery pack 110, and transmit the second current sampling signal to the second logic operation unit 140, so that the first logic operation unit 130 and the second logic operation unit 140 can monitor the current output by the battery pack 110. When the output current of the battery pack 110 is abnormal, the first output unit 150 and the second output unit 160 can be controlled to switch the connection between the output end of the battery pack 110 and the external circuit, thereby safely protecting the battery pack 110.

[0131] like Figure 2 and Figure 3 As shown, in some embodiments, optionally, the first output unit 150 and the second output unit 160 include at least one of the following: a switch tube, a relay, a contactor, a DC-DC converter, a MOS tube, and a controllable fuse.

[0132] In the embodiment of the present application, both the first output unit 150 and the second output unit 160 are elements that can be controlled to be on and off, and the elements corresponding to the first output unit 150 and the second output unit 160 can be the same or different, which improves the configuration flexibility of the battery management system 100.

[0133] like Figure 2 As shown, the first output unit 150 is selected as a MOS tube, and the second output unit 160 is selected as a controllable fuse.

[0134] like Figure 3 As shown, the first output unit 150 is selected as the main contactor of the battery management system 100, thereby reusing the original components in the battery management system 100 and reducing the hardware cost of the battery management system 100, and the second output unit 160 is selected as a controllable fuse.

[0135] like Figures 1 to 3 As shown, in some embodiments, optionally, the battery management system 100 further includes: a first power supply 131, connected to the first logic operation unit 130, for supplying power to the first logic operation unit 130; a first clock source 132, connected to the first logic operation unit 130, for providing a first clock signal to the first logic operation unit 130; a first reference source 133, connected to the first logic operation unit 130, for providing a first reference signal to the first logic operation unit 130, so that the first logic operation unit 130 operates based on the first sampling signal and the first reference signal Determine the fault state of the battery pack 110; a second power supply 141 is connected to the second logic operation unit 140 and is used to supply power to the second logic operation unit 140; a second clock source 142 is connected to the second logic operation unit 140 and is used to provide a second clock signal to the second logic operation unit 140; a second reference source 143 is connected to the second logic operation unit 140 and is used to provide a second reference signal to the second logic operation unit 140, so that the second logic operation unit 140 determines the fault state of the battery pack 110 based on the second sampling signal and the second reference signal.

[0136] In this embodiment, the first logic operation unit 130 is connected to the first power supply 131, the first clock source 132 and the first reference source 133, and the first power supply 131, the first clock source 132 and the first reference source 133 provide a power supply signal, a clock signal and a reference signal to the first logic operation unit 130. The second logic operation unit 140 is connected to the second power supply 141, the second clock source 142 and the second reference source 143, and the second power supply 141, the second clock source 142 and the second reference source 143 provide a power supply signal, a clock signal and a reference signal to the second logic operation unit 140.

[0137] In the embodiment of the present application, by independently supplying power to the first logic operation unit 130 and independently transmitting clock signals and reference signals, the situation in which the battery management system 100 fails to protect the battery pack 110 due to a problem with any of the power supply signals, clock signals and reference signals in the first logic operation unit 130 or the second logic operation unit 140 is avoided, thereby ensuring the safety of the first logic operation unit 130 and the second logic operation unit 140 in the event of a common cause failure.

[0138] According to one embodiment of the present application, Figure 4 A flow chart of a control method provided in some embodiments of the present application is shown. Figure 4 As shown, a control method is proposed, which is applied to the battery management system in any of the above embodiments, and the control method includes:

[0139] Step 402, the first logic operation unit obtains a first sampling signal through the first sampling unit, and the second logic operation unit obtains a second sampling signal through the second sampling unit;

[0140] Step 404: the first logic operation unit controls the on-off state of the first output unit according to the first sampling signal, and the second logic operation unit controls the on-off state of the second output unit according to the second sampling signal.

[0141] In this embodiment, the battery management system includes a battery pack and two independent control channels, and the two independent control channels can control the on-off state between the output end of the battery pack and the external circuit. Among them, one control channel includes a first sampling unit, a first logic operation unit and a first output unit, and the other control channel includes a second sampling unit, a second logic operation unit and a second output unit. The first output unit and the second output unit are both connected between the battery pack and the external circuit. When the first logic operation unit determines that the battery pack has a fault according to the first sampling signal, the path between the battery pack and the external circuit can be cut off through the first output unit. When the second logic operation unit determines that the battery has a fault according to the second sampling signal, the path between the battery pack and the external circuit can be cut off through the second output unit. It should be noted that the external circuit can be a load, in which case the battery pack is used to power the load, and the external circuit can also be a charging circuit, in which case the battery pack is charged by the charging circuit.

[0142] In this embodiment, the first sampling unit and the second sampling unit can respectively collect the first sampling signal and the second sampling signal at the battery pack, the first sampling unit can transmit the first sampling signal to the first logic operation unit, the second sampling unit can transmit the second sampling signal to the second logic operation unit, the first logic operation unit can control the on-off state of the first output unit, and the second logic operation unit can control the on-off state of the second output unit, wherein the control of the first output unit by the first logic operation unit and the control of the second output unit by the second logic operation unit are independent of each other, and the sampling processes of the first sampling unit and the second sampling unit are also independent of each other, that is, the first sampling unit, the first logic operation unit and the first output unit can independently complete the safety protection function, and the second sampling unit, the second logic operation unit and the second output unit can also independently complete the safety protection function. When there is a single point failure in the first sampling unit, the second sampling unit, the first logic operation unit, the second logic operation unit, the first output unit and the second output unit, at least one control channel remains in the battery management system to ensure that the battery pack is in a safe state.

[0143] In the embodiment of the present application, by setting the first sampling unit and the second sampling unit in the battery management system, the first sampling signal collected by the first sampling unit and the second sampling signal collected by the second sampling unit are respectively transmitted to the first logic operation unit and the second logic operation unit, and the first logic operation unit and the second logic operation unit can respectively control the first output unit and the second output unit, so that the first logic operation unit and the first output unit, and the second logic operation unit and the second output unit form two independent control channels, when one of the control channels fails, the other control channel can still play a protective role, thereby improving the stability of the battery management system in protecting the battery pack and the safety of the battery pack operation. In addition, the basis for the first logic operation unit to determine whether the battery pack has a fault is the first sampling signal collected by the first sampling unit, and the basis for the second logic operation unit to determine whether the battery pack has a fault is the second sampling signal collected by the second sampling unit, further improving the independence of the first logic operation unit controlling the first output unit and the second logic operation unit controlling the second output unit, thereby further improving the stability of the battery pack protection.

[0144] In some embodiments, optionally, the first logic operation unit controls the on-off state of the first output unit according to the first sampling signal, and the second logic operation unit controls the on-off state of the second output unit according to the second sampling signal, including:

[0145] The first logic operation unit determines that the battery pack is in a fault state based on the first sampling signal, and controls the first output unit to disconnect;

[0146] The second logic operation unit determines that the battery pack is in a fault state based on the second sampling signal, and delays the control of the second output unit to disconnect.

[0147] In this embodiment, after receiving the first sampling signal, the first logic operation unit can compare the first sampling signal with the reference signal to determine whether the battery pack is in a fault state. When the battery pack is detected to be in a fault state, the first output unit is controlled to disconnect immediately to cut off the connection between the battery pack and the external circuit. After receiving the second sampling signal, the second logic operation unit can also compare the second sampling signal with the reference signal to determine whether the battery pack is in a fault state. When the battery pack is detected to be in a fault state, the second output unit is controlled to disconnect with a delay to cut off the connection between the battery pack and the external circuit.

[0148] It should be noted that the sampling unit is connected to the first logic operation unit and the second logic operation unit, so the time when the first logic operation unit receives the first sampling signal is close to the time when the second logic operation unit receives the second sampling signal, and the time required for the first logic operation unit to process and compare the first sampling unit is also close to the time required for the second logic operation unit to process and compare the second sampling signal. When the battery pack fails, and the first logic operation unit, the second logic operation unit, the first sampling unit and the second sampling unit are all normal, the first logic operation unit can control the first output unit to disconnect in time. At this time, the second logic operation unit delays the control of the second output unit to disconnect, so that the action of the second output unit is staggered with the action of the first output unit, avoiding the second output unit from disconnecting again when the first output unit has been disconnected, so that the second output unit only performs the disconnection action when the first output unit or the second logic operation unit fails.

[0149] In the embodiment of the present application, when the first logic operation unit determines that the battery pack is in a fault state, it can immediately control the first output unit to disconnect. When the second logic operation unit determines that the battery pack is in a fault state, it delays the control of the second output unit to disconnect, so that the second output unit performs the disconnection action only when the first output unit or the second logic operation unit fails. While improving the stability of the battery management system in protecting the safety of the battery pack, it also avoids meaningless repeated control, thereby achieving a better protection effect on the battery pack.

[0150] In some embodiments, optionally, after the first logic operation unit acquires the first sampling signal through the first sampling unit, and the second logic operation unit acquires the second sampling signal through the second sampling unit, the control method further includes:

[0151] The first logic operation unit transmits a first sampling signal to the second logic operation unit, and the second logic operation unit transmits a second sampling signal to the first logic operation unit;

[0152] When the sampling difference between the sampling value of the first sampling signal and the sampling value of the second sampling signal is greater than the difference threshold, the first logic operation unit controls the first output unit to be disconnected, or the second logic operation unit controls the second output unit to be disconnected.

[0153] In this embodiment, the first logic operation unit is communicatively connected with the second logic operation unit. When the first logic operation unit receives the first sampling signal from the first sampling unit, and when the second logic operation unit receives the second sampling signal from the second sampling unit, the first logic operation unit transmits the first sampling signal to the second logic operation unit, and the second logic operation unit also transmits the second sampling signal to the first logic operation unit, so that the first logic operation unit and the second logic operation unit can compare the first sampling signal with the second sampling signal. When the difference between the first sampling signal and the second sampling signal is large, it is determined that there is a sampling error at this time, and the first output unit can be controlled to be disconnected by the first logic operation unit, or the second output unit can be controlled to be disconnected by the second logic operation unit, so that the battery management system enters the safety protection mode.

[0154] In an embodiment of the present application, a communication connection is set between the first logic operation unit and the second logic operation unit, and the first logic operation unit and the second logic operation unit both transmit the sampling signals they receive to each other, so that the first logic operation unit and the second logic operation unit can both compare the difference between the first sampling signal and the second sampling signal. When the difference between the first sampling signal and the second sampling signal is too large, the first output unit or the second output unit is controlled to be disconnected, which can avoid the failure of the battery pack safety protection due to inaccurate sampling of the sampling signal, and further improve the stability of the battery management system for the battery pack safety protection.

[0155] According to one embodiment of the present application, Figure 5 One of the structural block diagrams of a control device provided in some embodiments of the present application is shown. Figure 5 As shown, a control device 500 is proposed, which is applied to the battery management system in any of the above embodiments. The control device 500 includes:

[0156] An acquisition module 502 is used to acquire a first sampling signal and a second sampling signal;

[0157] The control module 504 is used to control the on / off state of the first output unit according to the first sampling signal, and to control the on / off state of the second output unit according to the second sampling signal.

[0158] In this embodiment, the acquisition module 502 includes a first sampling unit and a second sampling unit in the battery management system, and the control module 504 includes a first logic operation unit and a second logic operation unit in the battery management system.

[0159] In the embodiment of the present application, by setting the first sampling unit and the second sampling unit in the battery management system, the first sampling signal collected by the first sampling unit and the second sampling signal collected by the second sampling unit are respectively transmitted to the first logic operation unit and the second logic operation unit, and the first logic operation unit and the second logic operation unit can respectively control the first output unit and the second output unit, so that the first logic operation unit and the first output unit, and the second logic operation unit and the second output unit form two independent control channels, when one of the control channels fails, the other control channel can still play a protective role, thereby improving the stability of the battery management system in protecting the battery pack and the safety of the battery pack operation. In addition, the basis for the first logic operation unit to determine whether the battery pack has a fault is the first sampling signal collected by the first sampling unit, and the basis for the second logic operation unit to determine whether the battery pack has a fault is the second sampling signal collected by the second sampling unit, further improving the independence of the first logic operation unit controlling the first output unit and the second logic operation unit controlling the second output unit, thereby further improving the stability of the battery pack protection.

[0160] In some embodiments, optionally, the control module 504 is configured to determine that the battery pack is in a fault state based on the first sampling signal, and control the first output unit to be disconnected;

[0161] The control module 504 is used to determine that the battery pack is in a fault state based on the second sampling signal, and delay control the second output unit to disconnect.

[0162] In this embodiment, the first logic operation unit in the control module 504 performs an action of controlling the first output unit to be disconnected, and the second logic operation unit in the control module 504 performs an action of controlling the second output unit to be disconnected.

[0163] In the embodiment of the present application, when the first logic operation unit determines that the battery pack is in a fault state, it can immediately control the first output unit to disconnect. When the second logic operation unit determines that the battery pack is in a fault state, it delays the control of the second output unit to disconnect, so that the second output unit performs the disconnection action only when the first output unit or the second logic operation unit fails. While improving the stability of the battery management system in protecting the safety of the battery pack, it also avoids meaningless repeated control, thereby achieving a better protection effect on the battery pack.

[0164] In some embodiments, optionally, the control module 504 is configured to transmit the first sampling signal to the second logic operation unit, and transmit the second sampling signal to the first logic operation unit;

[0165] The control module 504 is used to control the first output unit to be disconnected, or control the second output unit to be disconnected when the sampling difference between the sampling value of the first sampling signal and the sampling value of the second sampling signal is greater than the difference threshold.

[0166] In this embodiment, the first logic operation unit is used to transmit the first sampling signal to the second logic operation unit and to control the first output unit to be disconnected. The second logic operation unit is used to transmit the second sampling signal to the first logic operation unit and to control the second output unit to be disconnected.

[0167] In an embodiment of the present application, a communication connection is set between the first logic operation unit and the second logic operation unit, and the first logic operation unit and the second logic operation unit both transmit the sampling signals they receive to each other, so that the first logic operation unit and the second logic operation unit can both compare the difference between the first sampling signal and the second sampling signal. When the difference between the first sampling signal and the second sampling signal is too large, the first output unit or the second output unit is controlled to be disconnected, which can avoid the failure of the battery pack safety protection due to inaccurate sampling of the sampling signal, and further improve the stability of the battery management system for the battery pack safety protection.

[0168] According to one embodiment of the present application, Figure 6 FIG. 2 shows a second structural block diagram of a control device provided in some embodiments of the present application, such as Figure 6 As shown, the control device 600 includes a processor 602 and a memory 604. The memory 604 stores a program or instruction. When the program or instruction is executed by the processor 602, the steps of the control method in any of the above embodiments are implemented. Therefore, the control device 600 of the battery management system has all the beneficial effects of the control method in any of the above embodiments, which will not be repeated here.

[0169] According to one embodiment of the present application, optionally, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the control method in any of the above embodiments are implemented, thereby having all the beneficial technical effects of the control method in any of the above embodiments.

[0170] The readable storage medium includes a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0171] A computer readable storage medium may be a tangible device that can retain and store instructions for use by an instruction execution device. A computer readable storage medium may be an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above devices, but is not limited thereto. A non-exhaustive list of more specific examples of computer readable storage media includes: portable computer floppy disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disk read-only memory (CD-ROM), digital versatile disk (DVD), memory card, floppy disk, encoding mechanical device (such as a punch card or a groove with a raised structure with instructions recorded) and any suitable combination of the above devices. The computer readable storage medium used herein should not be understood as a transmission signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium, or an electrical signal transmitted through a wire, etc.

[0172] According to one embodiment of the present application, Figure 7 A structural block diagram of an energy storage device is shown in some embodiments of the present application. Figure 7 As shown, the energy storage device 700 includes: the battery management system 100 in any of the above embodiments; and / or the control device 500 in any of the above embodiments; and / or the readable storage medium 702 in any of the above embodiments, and thus has all the beneficial technical effects of the battery management system 100 in any of the above embodiments; and / or the control device 500 in any of the above embodiments; and / or the readable storage medium 702 in any of the above embodiments, which will not be repeated here.

[0173] Exemplarily, the energy storage device 700 is connected to a photovoltaic module, and the electrical energy in the photovoltaic module can be stored in a battery pack in the energy storage device.

[0174] It should be clarified that in the claims, specification and drawings of the present application, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the drawings, which is only for the purpose of more conveniently describing the present application and making the description process easier, rather than indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limitations on the present application; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood based on the specific circumstances of the above data.

[0175] In the claims, specification and drawings of the present application, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like 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 application. In the claims, specification and drawings of the present application, 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.

[0176] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery management system, characterized in that: include: Battery pack; A first sampling unit, connected to the battery pack, and used to collect a first sampling signal of the battery pack; A first logic operation unit connected to the first sampling unit; A first output unit connected to the output end of the battery pack, and a control end of the first output unit connected to the first logic operation unit; A second sampling unit, connected to the battery pack, for collecting a second sampling signal of the battery pack; A second logic operation unit connected to the second sampling unit; A second output unit is connected to the output end of the battery pack, and a control end of the second output unit is connected to the second logic operation unit; The first logic operation unit controls the on-off state of the first output unit according to the first sampling signal, and the second logic operation unit controls the on-off state of the second output unit according to the second sampling signal.

2. The battery management system according to claim 1, characterized in that: The first logic operation unit is communicatively connected with the second logic operation unit, the first logic operation unit is used to transmit the first sampling signal to the second logic operation unit, and the second logic operation unit is used to transmit the second sampling signal to the first logic operation unit; Wherein, when the sampling difference between the sampling value of the first sampling signal and the sampling value of the second sampling signal is greater than the difference threshold, the first logic operation unit controls the first output unit to be disconnected, or the second logic operation unit controls the second output unit to be disconnected.

3. The battery management system according to claim 1, characterized in that: The first logic operation unit determines that the battery pack is in a fault state based on the first sampling signal, and controls the first output unit to be disconnected; The second logic operation unit determines that the battery pack is in a fault state based on the second sampling signal, and delays controlling the second output unit to be disconnected.

4. The battery management system according to any one of claims 1 to 3, characterized in that: The first sampling signal includes: a first voltage sampling signal and / or a first temperature sampling signal, the first sampling unit includes: a first sampling chip, a sampling end of the first sampling chip is connected to the battery pack, and is used to collect the first voltage sampling signal and / or the first temperature sampling signal, and the output end of the first sampling chip is used to transmit the first sampling signal; The second sampling signal includes: a second voltage sampling signal and / or a second temperature sampling signal, and the second sampling unit includes: a second sampling chip, a sampling end of the second sampling chip is connected to the battery pack, and is used to collect the second voltage sampling signal and / or the second temperature sampling signal, and an output end of the second sampling chip is used to transmit the second sampling signal.

5. The battery management system according to claim 4, characterized in that: The number of the battery packs is at least two, the number of the first sampling chips is the same as the number of the battery packs, and at least two of the first sampling chips are respectively connected to at least two of the battery packs; The first sampling unit further includes: a first communication circuit, a first end of the first communication circuit is connected to at least two of the first sampling chips, and a second end of the first communication circuit is connected to the first logic operation unit; The number of the second sampling chips is the same as the number of the battery packs, and at least two of the second sampling chips are respectively connected to at least two of the battery packs; The second sampling unit further includes: a second communication circuit, a first end of the second communication circuit is connected to at least two of the second sampling chips, and a second end of the second communication circuit is connected to the second logic operation unit.

6. The battery management system according to claim 4, characterized in that: The first sampling signal further includes: a first current sampling signal, the first sampling unit includes: a first current sampling element, the sampling end of the first current sampling element is connected to the output end of the battery pack, the output end of the first current sampling element is connected to the first logic operation unit, or the output end of the first current sampling element is connected to the first sampling chip, and the output end of the first current sampling element is used to transmit the first current sampling signal; The second sampling signal also includes: a second current sampling signal, the second sampling unit includes: a second current sampling element, the sampling end of the second current sampling element is connected to the output end of the battery pack, the output end of the second current sampling element is connected to the second logic operation unit, or the output end of the second current sampling element is connected to the second sampling chip, and the output end of the second current sampling element is used to transmit the second current sampling signal.

7. The battery management system according to any one of claims 1 to 3, characterized in that: The first output unit and the second output unit include at least one of the following: a switch tube, a relay, a contactor, a DC-DC converter, a MOS tube, and a controllable fuse.

8. The battery management system according to any one of claims 1 to 3, characterized in that: Also includes: a first power supply, connected to the first logic operation unit, and configured to supply power to the first logic operation unit; A first clock source, connected to the first logic operation unit, and configured to provide a first clock signal to the first logic operation unit; a first reference source connected to the first logic operation unit and configured to provide a first reference signal to the first logic operation unit, so that the first logic operation unit determines a fault state of the battery pack based on the first sampling signal and the first reference signal; a second power supply, connected to the second logic operation unit, and configured to supply power to the second logic operation unit; a second clock source, connected to the second logic operation unit, and configured to provide a second clock signal to the second logic operation unit; A second reference source is connected to the second logic operation unit and is used to provide a second reference signal to the second logic operation unit, so that the second logic operation unit determines the fault state of the battery pack based on the second sampling signal and the second reference signal.

9. A control method, characterized in that: Applied to the battery management system according to any one of claims 1 to 8, the control method comprises: The first logic operation unit obtains a first sampling signal through the first sampling unit, and the second logic operation unit obtains a second sampling signal through the second sampling unit; The first logic operation unit controls the on-off state of the first output unit according to the first sampling signal, and the second logic operation unit controls the on-off state of the second output unit according to the second sampling signal.

10. The control method according to claim 9, characterized in that: The first logic operation unit controls the on-off state of the first output unit according to the first sampling signal, and the second logic operation unit controls the on-off state of the second output unit according to the second sampling signal, including: The first logic operation unit determines that the battery pack is in a fault state based on the first sampling signal, and controls the first output unit to be disconnected; The second logic operation unit determines that the battery pack is in a fault state based on the second sampling signal, and delays controlling the second output unit to be disconnected.

11. The control method according to claim 9 or 10, characterized in that: After the first logic operation unit acquires the first sampling signal through the first sampling unit, and the second logic operation unit acquires the second sampling signal through the second sampling unit, the control method further includes: The first logic operation unit transmits the first sampling signal to the second logic operation unit, and the second logic operation unit transmits the second sampling signal to the first logic operation unit; When a sampling difference between a sampling value of the first sampling signal and a sampling value of the second sampling signal is greater than a difference threshold, the first logic operation unit controls the first output unit to be disconnected, or the second logic operation unit controls the second output unit to be disconnected.

12. A control device, characterized in that: The battery management system according to any one of claims 1 to 8, wherein the control device comprises: An acquisition module, used for acquiring a first sampling signal and a second sampling signal; A control module is used to control the on / off state of the first output unit according to the first sampling signal, and to control the on / off state of the second output unit according to the second sampling signal.

13. A control device, characterized in that: include: processor; A memory, wherein a program or instruction is stored in the memory, and the processor implements the steps of the control method according to any one of claims 9 to 11 when executing the program or instruction in the memory.

14. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the steps of the control method according to any one of claims 9 to 11 are implemented.

15. An energy storage device, characterized in that: include: The battery management system according to any one of claims 1 to 8; and / or The control device of claim 12 or 13; and / or The readable storage medium of claim 14.

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