Traction battery management device and traction battery apparatus

Abstract

Provided in the present disclosure is a traction battery management device, wherein a first interface is used for being connected to a traction battery; a second interface is used for being connected to an external device of the traction battery; a collection interface is used for acquiring operation information of the traction battery from the traction battery and transmitting the operation information to a main control unit; and a processing circuit is respectively connected to the first interface and the second interface. The main control unit is configured to: control, in response to having met a preset first protection condition, an isolation unit to be turned off, so as to disconnect the processing circuit from the second interface; control, in response to no longer meeting the first protection condition, the turned-off isolation unit to be turned on, so as to connect the processing circuit to the second interface; control, in response to having met a preset second protection condition, the isolation unit to be turned off, so as to respectively disconnect the processing circuit from the first interface and the second interface; and control, in response to having received a recovery instruction and no longer meeting the second protection condition, the turned-off isolation unit to be turned on, so as to respectively connect the processing circuit to the first interface and the second interface.

Description

Power battery management equipment, power battery device

[0001] Cross-reference to related applications

[0002] This patent application claims priority to Chinese Patent Application 202411603134.2, filed on November 11, 2024, with the State Intellectual Property Office of China, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure relates to the field of power battery management technology, and in particular to a power battery management device and a power battery assembly. Background Technology

[0004] As backup power and energy storage devices, power batteries have very high requirements for reliability. For example, power batteries may bulge, catch fire, or explode. Therefore, it is necessary to isolate power batteries from external equipment (such as electrical appliances and power supply equipment) when necessary to prevent the spread of faults.

[0005] Isolation of power batteries is one of the important means to ensure their safety and reliability. Summary of the Invention

[0006] This disclosure provides a power battery management device and a power battery assembly.

[0007] In a first aspect, embodiments of this disclosure provide a power battery management device, including a main control unit, a data acquisition interface, a first interface, a second interface, a processing circuit, and an isolation unit. The first interface is used to connect to a power battery, the second interface is used to connect to an external device connected to the power battery, the data acquisition interface is used to acquire operating information of the power battery from the power battery and transmit it to the main control unit, the processing circuit is connected to both the first interface and the second interface, and the main control unit is configured to: control the isolation unit to shut down in response to a preset first protection condition, thereby disconnecting the processing circuit from the second interface; control the shut-down isolation unit to turn on in response to the first protection condition no longer being met, thereby connecting the processing circuit to the second interface; control the isolation unit to shut down in response to a preset second protection condition, thereby disconnecting the processing circuit from both the first interface and the second interface; and control the shut-down isolation unit to turn on in response to receiving a recovery command and the second protection condition no longer being met, thereby connecting the processing circuit to both the first interface and the second interface.

[0008] Secondly, embodiments of this disclosure provide a power battery device, which includes: a power battery; and any power battery management device according to embodiments of this disclosure, wherein the first interface of the power battery management device is connected to the power battery. Attached Figure Description

[0009] In the accompanying drawings of the embodiments disclosed herein:

[0010] Figure 1 is a block diagram of the power battery management device provided in an embodiment of this disclosure;

[0011] Figure 2 is a block diagram of the power battery management device provided in an embodiment of this disclosure;

[0012] Figure 3 is a flowchart illustrating the operation of the main control unit in the power battery management device provided in this embodiment of the present disclosure.

[0013] Figure 4 is a flowchart illustrating the operation of the main control unit in the power battery management device provided in this embodiment of the present disclosure.

[0014] Figure 5 is a block diagram of the power battery management device provided in an embodiment of this disclosure;

[0015] Figure 6 is a schematic diagram of the operating principle of the power battery management device provided in the embodiments of this disclosure. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solutions of this disclosure, the power battery management device and power battery apparatus provided in the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings.

[0017] The present disclosure will be described more fully below with reference to the accompanying drawings; however, the embodiments shown may be embodied in different forms, and the present disclosure should not be construed as limited to the embodiments set forth below. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will enable those skilled in the art to fully understand the scope of the disclosure.

[0018] The accompanying drawings of the embodiments disclosed herein are provided to further illustrate the embodiments of this disclosure and form part of the specification. They are used together with the detailed embodiments to explain this disclosure and do not constitute a limitation thereof. The above and other features and advantages will become more apparent to those skilled in the art from the description of the detailed embodiments with reference to the accompanying drawings.

[0019] This disclosure may be described with reference to plan and / or cross-sectional views using the ideal schematic diagrams of this disclosure. Therefore, the example illustrations may be modified according to manufacturing techniques and / or tolerances.

[0020] Where there is no conflict, the various embodiments of this disclosure and the features thereof in the embodiments may be combined with each other.

[0021] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the disclosure. The term "and / or" as used in this disclosure includes any and all combinations of one or more of the associated enumerated entries. The singular forms "a" and "the" as used in this disclosure are also intended to include the plural forms, unless the context clearly indicates otherwise. The terms "comprising," "made of," etc., as used in this disclosure specify the presence of the stated feature, integral, step, operation, element, and / or component, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof.

[0022] Unless otherwise specified, all terms used in this disclosure (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this disclosure, and will not be interpreted as having an idealized or overly formal meaning, unless expressly so defined in this disclosure.

[0023] This disclosure is not limited to the embodiments shown in the accompanying drawings, but includes modifications to the configuration based on the manufacturing process. Therefore, the areas illustrated in the drawings are schematic, and the shapes of the areas shown illustrate specific shapes of the areas of an element, but are not intended to be limiting.

[0024] As backup power and energy storage devices, power batteries have very high requirements for reliability. For example, power batteries may bulge, catch fire, or explode. Therefore, it is necessary to isolate power batteries from external equipment (such as electrical equipment and power supply equipment) when necessary to prevent the spread of faults and ensure safety and reliability to the greatest extent. This is especially true for backup batteries used in core computer rooms and batteries that are closely related to personnel (such as batteries in new energy vehicles).

[0025] In some related technologies, power battery devices need to be manually repaired or replaced after being isolated in order to be put back into use. This is cumbersome, inefficient, and cannot be isolated in different ways depending on the specific circumstances of the anomaly. In other words, it cannot achieve "differentiated" isolation.

[0026] For example, the power battery device adopts a passive isolation method, that is, the circuit of the power battery device is equipped with protective devices such as fuses and circuit breakers. When the melting conditions are met (such as excessive current or excessive temperature), the protective devices will melt to cut off the connection between the power battery and the external equipment, thereby isolating the battery and achieving the purpose of protection.

[0027] However, the above protective devices achieve isolation by melting, and the melted protective devices cannot be restored by themselves. Therefore, the power battery device must be manually repaired or replaced after isolation.

[0028] In addition, the fuse can only be triggered under specific physical conditions (such as current and temperature), and there are only two states: fused or not fused. It cannot isolate in different ways according to the specific abnormal situation. That is, it cannot achieve "differential" isolation, and in some cases, the power battery may still catch fire, explode or other serious failures.

[0029] This disclosure provides a power battery management device (BMS) that is installed between a power battery and an external device to manage the connection between the power battery and the external device, enabling the power battery to be in different states such as connected or isolated.

[0030] In this embodiment of the disclosure, the power battery is a battery used to provide a power source for the working object. In terms of form, the power battery in this embodiment of the disclosure can be a single battery or a battery pack composed of multiple batteries (such as an integrated PAKE pack). In terms of the main positive electrode material, the power battery in this embodiment of the disclosure can be a lithium cobalt oxide battery, a lithium manganese oxide battery, a lithium nickel cobalt manganese oxide (NCM) battery, a lithium nickel cobalt aluminum oxide (NCA) battery, a lithium iron phosphate battery, a lithium titanate battery, etc.

[0031] It should be understood that, in addition to the battery body for storing electrical energy, the power battery in this embodiment may also include other auxiliary battery structures, such as circuits that connect the battery to external devices, communication devices for collecting and transmitting battery data (operational information of the power battery), etc., which will not be described in detail here.

[0032] In this embodiment of the disclosure, the external device is a device that can be connected to the power battery to work. It can be an electrical device that can receive electrical energy provided by the power battery and operate based on the electrical energy, or it can be a power supply device that can provide electrical energy to the power battery to charge it.

[0033] In this embodiment of the disclosure, the electrical equipment can be various communication devices in the core computer room, that is, the power battery can be used as a backup battery when the communication device loses power. Alternatively, the electrical equipment can also be a new energy vehicle, that is, the power battery can be used as a power source for the new energy vehicle.

[0034] In this embodiment of the disclosure, the power supply equipment can be a power source capable of charging the power battery, such as a general mains power source, or a separate power source (such as a new energy power source such as solar or wind power).

[0035] It should be understood that the external device connected to the power battery in the embodiments of this disclosure may be only one of the power-consuming device and the power supply device, or it may include both the power-consuming device and the power supply device.

[0036] It should be understood that when the power battery in the embodiments of this disclosure is connected to an external device, it does not necessarily mean that there is a continuous current flow between the two. For example, the power battery can be connected to both the power-consuming device and the power supply device at the same time, and the power-consuming device is also connected to the power supply device. Thus, under normal circumstances, the power supply device can supply power to the power-consuming device. When the power supply device fails (such as a power outage), the power battery can temporarily supply power to the power-consuming device to prevent the power-consuming device from shutting down. After the power supply device is restored, the power battery stops supplying power to the power-consuming device, and the power supply device resumes supplying power to the power-consuming device. When the remaining charge of the power battery is insufficient, the power supply device can charge the power battery.

[0037] Referring to FIG1, the power battery management device of this disclosure includes a main control unit, a data acquisition interface, a first interface, a second interface, a processing circuit, and an isolation unit.

[0038] The first interface is used to connect to the power battery.

[0039] The second interface is used to connect to external devices connected to the power battery.

[0040] The acquisition interface is used to obtain the operating information of the power battery and transmit the operating information to the main control unit.

[0041] The processing circuit is connected to the first interface and the second interface respectively.

[0042] The main control unit is configured to: control the isolation unit to turn off in response to a preset first protection condition, thereby disconnecting the processing circuit from the first interface; control the turned-off isolation unit to turn on in response to the first protection condition no longer being met, thereby connecting the processing circuit to the first interface; and control the isolation unit to turn off in response to a preset second protection condition, thereby disconnecting the processing circuit from the first interface and the second interface respectively; and control the turned-off isolation unit to turn on in response to receiving a recovery command and the second protection condition no longer being met, thereby connecting the processing circuit to the first interface and the second interface respectively.

[0043] Referring to FIG1, the power battery management device of this disclosure includes a first interface and a second interface respectively connected to a power battery and an external device, and a processing circuit respectively connected to the first interface and the second interface, so that the power battery management device can connect the power battery and the external device, and use the processing circuit to perform the required processing on the signals between the power battery and the external device.

[0044] For example, the processing circuit may include a power conversion circuit, which is used to adjust the current passing through the main control unit to a preset current limit range under the control of the main control unit, so as to ensure that the current during charging and discharging of the power battery is within the preset current limit point (current limit range), thereby avoiding the power battery from being in an overcurrent operating state for a long time, and improving the operating life and reliability of the power battery. The power conversion circuit may specifically be various forms of DC (direct current) / DC conversion circuit.

[0045] It should be understood that the processing circuit in the embodiments of this disclosure is not limited to the form of a power conversion circuit. It may also be other circuits and may be connected to the first interface and the second interface in other ways.

[0046] The power battery management device of this disclosure embodiment also includes an isolation unit. The isolation unit may be a circuit structure that can repeatedly switch between an on state and an off state under the control of the main control unit. For example, it may include switching devices such as contactors and relays.

[0047] The power battery management device of this embodiment can acquire the operating information of the power battery through the acquisition interface. The main control unit can control the isolation unit according to the above operating information, that is, control the isolation unit to be in the on state or the off state, so as to achieve the required isolation.

[0048] It should be understood that the data acquisition interface can also receive external information from other channels, such as user-inputted commands.

[0049] In this embodiment of the disclosure, the main control unit can be a circuit structure capable of implementing a predetermined data processing procedure and outputting the required control signals. It may include a main control chip and its peripheral auxiliary circuits, and if necessary, may also include peripheral units extended to meet other requirements. The main control chip may be in the form of a digital signal processor (DSP), a field programmable gate array (FPGA), or the like.

[0050] In this embodiment of the disclosure, the first interface, processing circuit, and second interface may be a single set as shown in Figure 1 (the power battery may have only one circuit), or multiple sets as shown in Figure 2 (the power battery may have multiple circuits). For example, the electrical equipment and the power supply equipment are connected to different second interfaces, and the different second interfaces are connected to different processing circuits (or multiple second interfaces are connected to the same processing circuit) and the first interface. Thus, the isolation units in different circuits can be controlled independently or uniformly, that is, the connection between the power battery and different external devices can be independent.

[0051] Referring to Figures 2 and 5, the power battery management device of this embodiment can be integrated with the power battery to form a power source that can supply power to the outside and control the power supply, that is, a power battery device.

[0052] Referring to FIG3, in the power battery management device of this embodiment, the main control unit is configured to perform the following steps.

[0053] In step S1011, in response to the satisfaction of a preset first protection condition, the isolation unit is turned off, thereby disconnecting the processing circuit from the second interface.

[0054] In step S1012, in response to the first protection condition no longer being met, the isolation unit that was controlled to be turned on is turned on, thereby connecting the processing circuit to the second interface.

[0055] In step S1021, in response to the satisfaction of the preset second protection condition, the isolation unit is controlled to be turned off, thereby disconnecting the processing circuit from the first interface and the second interface respectively.

[0056] In step S1022, in response to receiving a recovery command and no longer meeting the second protection condition, the isolation unit that was controlled to be turned on is turned on, thereby connecting the processing circuit to the first interface and the second interface respectively.

[0057] Referring to Figure 3, in this embodiment of the present disclosure, the control process of the main control unit on the isolation unit may include: when the operating information of the power battery indicates that the current condition of the power battery meets the preset first protection condition (there is a risk of failure), the main control unit controls the corresponding isolation unit to shut down, thereby disconnecting the processing circuit from the second interface, and thus isolating the external device from the power battery (external isolation). When the situation changes and the operating information of the power battery no longer meets the first protection condition (the risk of failure disappears), the main control unit can control the corresponding isolation unit to reconnect, that is, restore the connection between the power battery and the external device. When the operating information of the power battery indicates that the current condition of the power battery meets the preset second protection condition (different from the first protection condition), the main control unit can also control the corresponding isolation unit to shut down, but here the connection between the processing circuit and both the first and second interfaces is disconnected, that is, the power battery is isolated from the external device (external isolation) and the power battery is isolated from the processing circuit (internal isolation). Unlike the isolation triggered by restoring the first protection condition, in this case, in order for the isolation unit to reconnect, in addition to requiring that the second protection condition is no longer met, it is also required to receive a user's instruction to allow restoration (restoration instruction).

[0058] It should be understood that the different steps of the first protection condition and the second protection condition in this embodiment are triggered separately according to the actual situation during operation. Therefore, the above numbering and description order do not represent the execution order of the corresponding steps.

[0059] In this embodiment, the main control unit of the power battery management device can automatically control the isolation unit to be turned on or off according to specific circumstances (power battery operating information). This allows for automatic isolation of the power battery from external devices when there is a risk of failure (abnormality) to ensure safety and reliability. Furthermore, it allows for automatic restoration of the connection between the power battery and external devices after the risk is eliminated, eliminating the need for manual repair or replacement. This ensures the safety and reliability of the power battery while simplifying operation and increasing efficiency. In addition, this embodiment can control the isolation unit in different ways depending on the specific abnormal situation, achieving "differentiated" isolation.

[0060] In some embodiments, the first protection condition includes at least one of the following: power battery undervoltage, power battery overvoltage, power battery low temperature, power battery overheating, power battery overcurrent, and receiving a protection command.

[0061] As one embodiment of this disclosure, triggering isolation under the first protection condition may include the occurrence of undervoltage, overvoltage, low temperature, overtemperature, overcurrent, etc. in the power battery, or it may be an instruction (protection instruction) issued by the user requesting isolation.

[0062] As can be seen, the above "first protection condition" mainly includes relatively "mild" risks that can be eliminated on their own. For example, the power battery may experience overcurrent under certain circumstances, thus requiring isolation to eliminate the risk. When the current decreases and the power battery no longer experiences overcurrent, the connection of the power battery can be restored. Therefore, the embodiments of this disclosure can perform "mild isolation" or "first-level isolation" when the first protection condition is met. That is, it enters an isolation state when the first protection condition is met, and it is sufficient to isolate the external device from the power battery to avoid adverse effects on the external device. When the first protection condition is no longer met, the connection of the power battery can be directly and automatically restored.

[0063] It should be understood that the content of the first protection condition is not limited to the specific examples above, and its specific content can be adjusted as needed.

[0064] In some embodiments, the second protection condition includes at least one of the following: abnormal reverse connection of the power battery, abnormal power battery circuit, abnormal power battery communication, and abnormal power battery sampling.

[0065] As one embodiment of this disclosure, triggering isolation under the second protection condition may include situations such as reverse connection abnormality of the power battery, circuit abnormality, communication abnormality (such as abnormal connection between the power battery and the communication device in the power battery), sampling abnormality, etc.

[0066] As can be seen, the above-mentioned "second protection condition" mainly includes relatively "moderate" risks that are difficult to eliminate on their own. For example, if the power battery is reverse-connected, it usually will not automatically return to a normal connection unless repaired by the user. Therefore, the embodiments of this disclosure can perform "moderate isolation" or "second-level isolation" when the second protection condition is met. That is, when the second protection condition is met, it enters an isolation state and the power battery is also isolated to prevent abnormalities in the power battery from damaging the processing circuit (such as abnormal current caused by reverse connection). In addition, after the second protection condition is no longer met, the user is required to give an instruction (recovery instruction) indicating that the risk has been eliminated (such as user operation to eliminate reverse connection) and the connection can be restored before the power battery connection is restored.

[0067] It should be understood that the content of the second protection condition is not limited to the specific examples above, and its specific content can be adjusted as needed.

[0068] Referring to Figure 4, in some embodiments, the main control unit is also configured to execute step S1031.

[0069] In step S1031, in response to the satisfaction of a preset third protection condition, the control isolation unit is turned off and permanently locked, thereby disconnecting the processing circuit from at least one of the first interface and the second interface.

[0070] Referring to FIG4, as one embodiment of this disclosure, when the third protection condition (which is different from the first and second protection conditions) is met, the main control unit can control the corresponding isolation unit to shut down and permanently lock it, thereby enabling the power battery to enter a "permanent" isolation state.

[0071] It should be understood that isolation in this state requires disconnecting the processing circuit from at least one of the first interface and the second interface, or it can be disconnected from both, as long as the first interface is eventually disconnected from the second interface (that is, the power battery is disconnected from the external device).

[0072] In some embodiments, the third protection condition includes: damage to the power battery management device.

[0073] As one embodiment of this disclosure, the isolation triggered under the third protection condition may be due to a permanent damage caused by a fault in the power battery management device itself, such as damage to a single device or a circuit.

[0074] As can be seen, for battery isolation, the aforementioned "third protection condition" represents the most severe risk. For example, if the power battery management device itself suffers permanent damage, it obviously cannot "repair" itself, and therefore it is impossible to continue to ensure proper management of the power battery, which can easily lead to serious safety problems. Therefore, the embodiments of this disclosure can perform "permanent isolation" or "third-level isolation" when the third protection condition is met, that is, lock the power battery in an isolated state when the third protection condition is met, making it irreversible.

[0075] It should be understood that if a user replaces or repairs the power battery management device, they can continue to manage the power battery; however, in this case, for the "new" power battery management device, it is a "new start" in managing the power battery, rather than restoring the power battery connection.

[0076] It should be understood that the content of the third protection condition is not limited to the specific examples above, and its specific content can be adjusted as needed.

[0077] As can be seen, the embodiments of this disclosure can isolate the power battery in different ways (light isolation, medium isolation, permanent isolation) depending on the specific circumstances (such as the first protection condition, the second protection condition, and the third protection condition). In other words, "differential" isolation can be achieved, thereby ensuring safety and reliability under various circumstances, completely eliminating the possibility of serious failures such as fire and explosion of the power battery, and allowing the power battery to automatically restore connection as much as possible, reducing human operation.

[0078] In some embodiments, referring to FIG2, the isolation unit includes a first isolation unit and a second isolation unit; the first isolation unit is used to control the processing circuit to connect or disconnect from the first interface, and the second isolation unit is used to control the processing circuit to connect or disconnect from the second interface.

[0079] Referring to FIG2, as one embodiment of the present disclosure, isolation units (first isolation unit and second isolation unit) may be provided on both sides of the processing circuit, respectively, for isolating the processing circuit from the power battery (internal isolation) and isolating the processing circuit from external devices (external isolation).

[0080] In some embodiments, in response to the satisfaction of a preset first protection condition, the control isolation unit is turned off, thereby disconnecting the processing circuit from the second interface (S1011), which includes the following steps S10111.

[0081] In step S10111, in response to the satisfaction of a preset first protection condition, the second isolation unit is controlled to be turned off, thereby disconnecting the processing circuit from the second interface.

[0082] In response to the first protection condition no longer being met, the isolation unit that was controlled to be turned on is turned on, thereby connecting the processing circuit to the second interface (S1012), which includes the following steps S10121.

[0083] In step S10121, in response to the first protection condition no longer being met, the second isolation unit is turned on, thereby connecting the processing circuit to the second interface.

[0084] In some embodiments, in response to satisfying a preset first protection condition, controlling the second isolation unit to turn off, thereby disconnecting the processing circuit from the second interface (S10111), includes the following steps S10111.

[0085] In step S101111, in response to the satisfaction of the preset first protection condition, the control processing circuit stops working, and then the control second isolation unit is turned off, thereby disconnecting the processing circuit from the second interface.

[0086] In response to the fact that the first protection condition is no longer met, the control of the second isolation unit to be turned on, thereby connecting the processing circuit to the second interface (S10121), includes the following steps S101211.

[0087] In step S101211, in response to the first protection condition no longer being met, the second isolation unit is turned on, thereby connecting the processing circuit to the second interface, and then the processing circuit is controlled to start working.

[0088] As one embodiment of this disclosure, for a circuit with two isolation units, when a preset first protection condition is met, external isolation can be achieved by controlling the second isolation unit to be turned off or on.

[0089] Furthermore, as one embodiment of this disclosure, the processing circuit can be controlled to stop working before the second isolation unit is turned off (not that it is turned off in the circuit, but that it stops performing the corresponding processing); conversely, the processing circuit can be restored to work only after the second isolation unit is turned on, so as to better protect the processing circuit.

[0090] In some embodiments, in response to the satisfaction of a preset second protection condition, the isolation unit is controlled to shut down, thereby disconnecting the processing circuit from the first interface and the second interface respectively (S1021), which includes the following steps S10211.

[0091] In step S10211, in response to the satisfaction of the preset second protection condition, the second isolation unit is controlled to be turned off, and then the first isolation unit is controlled to be turned off, thereby disconnecting the processing circuit from the first interface and the second interface respectively.

[0092] In response to receiving a recovery command and no longer meeting the second protection condition, the isolation unit that was shut down is turned on, thereby connecting the processing circuit to the first interface and the second interface respectively (S1022), including the following steps S10221.

[0093] In step S10221, in response to receiving a recovery command and no longer meeting the second protection condition, the first isolation unit is turned on, and then the second isolation unit is turned on, thereby connecting the processing circuit to the first interface and the second interface respectively.

[0094] In some embodiments, in response to satisfying a preset second protection condition, the second isolation unit is controlled to turn off, and then the first isolation unit is controlled to turn off, thereby disconnecting the processing circuit from the first interface and the second interface respectively (S10211), including the following steps S102111.

[0095] In step S102111, in response to the satisfaction of the preset second protection condition, the control processing circuit stops working, then the control second isolation unit is turned off, and then the control first isolation unit is turned off, thereby disconnecting the processing circuit from the first interface and the second interface respectively.

[0096] In response to receiving a recovery command and no longer meeting the second protection condition, the first isolation unit is turned on, and then the second isolation unit is turned on, thereby connecting the processing circuit to the first interface and the second interface respectively (S10221), which includes the following steps.

[0097] In step S102211, in response to receiving a recovery command and no longer meeting the second protection condition, the first isolation unit is turned on, and then the second isolation unit is turned on, thereby connecting the processing circuit to the first interface and the second interface respectively, and then the processing circuit is turned on to start working.

[0098] As one embodiment of this disclosure, for a circuit with two isolation units, when a preset second protection condition is met, the second isolation unit can be controlled to turn off first (external isolation), and then the first isolation unit can be controlled to turn off (internal isolation). Correspondingly, when restoring the connection, the first isolation unit can be controlled to turn on first, and then the second isolation unit can be controlled to turn on; the above operation sequence provides better security.

[0099] Furthermore, as one embodiment of this disclosure, the processing circuit may be stopped before the second isolation unit is turned off; conversely, the processing circuit may be restored only after the second isolation unit is turned on, so as to better protect the processing circuit.

[0100] In response to the satisfaction of a preset third protection condition, the control isolation unit is turned off and permanently locked, thereby disconnecting the processing circuit from at least one of the first interface and the second interface (S1031), including the following step S10311.

[0101] In step S10311, in response to the satisfaction of the preset third protection condition, the first isolation unit is controlled to be turned off and permanently locked, and then the second isolation unit is controlled to be turned off and permanently locked, thereby disconnecting the processing circuit from the first interface and the second interface.

[0102] As one embodiment of this disclosure, for a circuit with two isolation units, when the third protection condition is met and it is necessary to enter "permanent isolation", the first isolation unit can be turned off and permanently locked first, and then the second isolation unit can be turned off and permanently locked.

[0103] It should be understood that for a loop with two isolation units, the specific control process is not limited to the above method. For example, the order in which each structure is turned off (stopped) and turned on (operated) can be changed.

[0104] Referring to FIG5, an embodiment of this disclosure provides a power battery device, which includes: a power battery; and any of the power battery management devices of this disclosure, wherein a first interface of the power battery management device is connected to the power battery.

[0105] Referring to Figure 5, as one embodiment of this disclosure, the above-mentioned power battery management device and the power battery connected to it can be used together as a power battery device, that is, a power supply device that can directly provide electrical energy to the outside and has management functions.

[0106] Referring to FIG2, this Example 1 provides a power battery device, which includes a power battery and a power battery management device (BMS).

[0107] Power batteries include integrated PAKE packs of batteries made of materials such as lithium cobalt oxide, lithium manganese oxide, lithium nickel cobalt manganese oxide (NCM), lithium nickel cobalt aluminum oxide (NCA), lithium iron phosphate, and lithium titanate.

[0108] Referring to Figure 2, the power battery management device is used to control the power battery and realize its charging, discharging, and isolation.

[0109] Referring to Figure 2, the power battery management device is connected between the power battery and external devices other than the power battery unit. These external devices may include power supply equipment (such as mains power, or renewable energy sources like solar or wind power) used to charge the power battery; they may also include power-consuming devices, which are typically powered by the power supply equipment and can operate using the electrical energy stored in the power battery when the power supply equipment is unavailable. In other words, the power battery unit can serve as a backup power source for the power-consuming devices.

[0110] Referring to Figure 2, each circuit of the power battery management device includes, in sequence from the external device to the power battery, a second interface, a second isolation unit, a processing circuit, a first isolation unit, and a first interface. The first isolation unit, processing circuit, and second isolation unit of the power battery management device are all controlled by the main control unit, which can acquire the operating information of the power battery or the instructions input by the user through the acquisition interface.

[0111] The main control unit can process data and output corresponding control commands. It includes at least a main control chip (such as a DSP, PGA, etc.) and its peripheral auxiliary circuits, and may also include peripheral units to meet other requirements if necessary. As the "brain" of the entire power battery management device, the main control unit can analyze whether power battery isolation is needed based on information from the acquisition interface (power battery operating information), and what isolation method should be used. It then calculates how to control the first isolation unit, processing circuit, and second isolation unit, and issues corresponding control commands.

[0112] The processing circuit can be a power conversion circuit, such as various forms of DC / DC conversion circuits. Under the control of the main control unit, it can keep the current in the charging and discharging state within the set current limit point (current limit range), avoid the power battery being in an overcurrent operating state for a long time, and improve the operating life and reliability of the power battery.

[0113] The first isolation unit may include switching devices such as contactors and relays, thereby enabling active isolation. That is, the first isolation unit differs from protective devices such as fuses and circuit breakers in that it can be controlled to shut off under load, and the circuit can be controlled to be restored.

[0114] Similarly, the second isolation unit may include switching devices such as contactors and relays, thereby achieving active isolation. That is, the second isolation unit differs from protective devices such as fuses and circuit breakers in that it can be controlled to shut off under load, and the circuit can be controllably restored. Therefore, the function of the second isolation unit can be the same as that of the first isolation unit, but its specific structure can be the same as or different from that of the first isolation unit.

[0115] In this embodiment, three different protection conditions are set, which are called the first protection condition, the second protection condition, and the third protection condition in order of increasing risk level. The three protection conditions correspond to three different isolation methods, namely, the first level of isolation (mild isolation), the second level of isolation (moderate isolation), and the third level of isolation (permanent isolation).

[0116] The first protection condition may include power battery undervoltage, power battery overvoltage, power battery low temperature, power battery overheating, power battery overcurrent, etc., or it may be a protection command (warning) for first-level isolation received from the user. The corresponding first-level isolation method is: when the first protection condition is no longer met, the main control unit can automatically control the restoration of the power battery connection.

[0117] The second protection condition may include abnormal reverse connection of the power battery, abnormal power battery circuit, abnormal power battery communication, abnormal power battery sampling, etc. The corresponding second-level isolation method is: in addition to requiring that the second protection condition is no longer met, the user must manually release the isolation, that is, the main control unit must receive a recovery command issued by the user before the power battery connection can be restored.

[0118] The third protection condition may include permanent damage to the power battery management device, such as damage to individual components or circuits. The corresponding third-level isolation method is to shut down and permanently lock the isolation unit. Therefore, the new power battery management device can only "reconnect" the power battery after the user replaces or repairs the power battery management device.

[0119] Referring to Figure 6, in this Example 1, the specific operation process of the power battery management device may include the following steps.

[0120] In step A100, the power battery management device is powered in normal mode, both the first isolation unit and the second isolation unit are turned on, the processing circuit works under the control of the main control unit, and the power battery circuit is normally connected.

[0121] If the operating information of the power battery meets the first protection condition above, proceed with the following steps (A1011 to A1015).

[0122] In step A1011, the main control unit controls the processing circuit to stop working.

[0123] In step A1012, the main control unit controls the second isolation unit to shut down, thereby disconnecting the processing circuit from the second interface and isolating the power battery from external devices (external isolation).

[0124] In step A1013, after a certain period of time, the operating state of the power battery changes and no longer meets the first protection condition.

[0125] In step A1014, the main control unit controls the second isolation unit to be turned on again, thereby connecting the processing circuit to the second interface.

[0126] In step A1015, the main control unit controls the processing circuit to restart and restore the power battery management device to the state of backup power (A100) in normal mode.

[0127] If the operating information of the power battery meets the above second protection conditions, proceed with the following steps (A1021 to A1027).

[0128] In step A1021, the main control unit controls the processing circuit to stop working.

[0129] In step A1022, the main control unit controls the second isolation unit to shut down, thereby disconnecting the processing circuit from the second interface and isolating the power battery from external devices (external isolation).

[0130] In step A1023, the main control unit controls the first isolation unit to shut down, thereby disconnecting the processing circuit from the first interface and isolating the power battery from the processing circuit (internal isolation).

[0131] In step A1024, after troubleshooting the power battery malfunction, the user sends a recovery command to the main control unit.

[0132] In step A1025, the main control unit controls the first isolation unit to be turned on again, thereby connecting the control circuit to the first interface.

[0133] In step A1026, the main control unit controls the second isolation unit to be turned on again, thereby connecting the control circuit to the second interface.

[0134] In step A1027, the main control unit controls the processing circuit to restart and restore the power battery management device to the state of backup power (A100) in normal mode.

[0135] If the operating information of the power battery meets the above third protection condition, proceed with the following steps (A1031 to A1035).

[0136] In step A1031, the main control unit controls the processing circuit to stop working.

[0137] In step A1032, the main control unit controls the second isolation unit to shut down and permanently lock it, thereby disconnecting the processing circuit from the second interface and isolating the power battery from the external device (external isolation).

[0138] In step A1033, the main control unit controls the first isolation unit to shut down and permanently lock, thereby disconnecting the processing circuit from the first interface and isolating the power battery from the processing circuit (internal isolation).

[0139] In step A1034, the user replaces the power battery management device with a new one.

[0140] In step A1035, the new power battery management device restarts (the main control unit controls the first isolation unit and the second isolation unit to be turned on, and the control processing circuit resumes operation), restoring the power battery management device to the state of backup power in normal mode (A100).

[0141] This disclosure has disclosed exemplary embodiments, and although specific terminology has been used, it is for general illustrative purposes only and should not be construed as limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of this disclosure as set forth by the appended claims.

Claims

1. A power battery management device, comprising a main control unit, a data acquisition interface, a first interface, a second interface, a processing circuit, and an isolation unit, wherein, The first interface is used to connect to the power battery. The second interface is used to connect to external devices connected to the power battery. The acquisition interface is used to obtain the operating information of the power battery from the power battery and transmit the operating information to the main control unit. The processing circuit is connected to the first interface and the second interface respectively, and The main control unit is configured as follows: In response to the satisfaction of a preset first protection condition, the isolation unit is controlled to turn off, thereby disconnecting the processing circuit from the second interface; in response to the loss of the first protection condition, the turned-off isolation unit is controlled to turn on, thereby connecting the processing circuit to the second interface. as well as In response to the fulfillment of a preset second protection condition, the isolation unit is controlled to shut down, thereby disconnecting the processing circuit from the first interface and the second interface respectively; In response to receiving a recovery command and no longer meeting the second protection condition, the isolation unit that was controlled to be turned on is turned on, thereby connecting the processing circuit to the first interface and the second interface respectively.

2. The battery management device according to claim 1, wherein, The first protection condition includes at least one of the following: The power battery is undervoltage, overvoltage, low temperature, overheat, or overcurrent, and a protection command has been received.

3. The battery management device according to claim 1, wherein, The second protection condition includes at least one of the following: The power battery reverse connection is abnormal, the power battery circuit is abnormal, the power battery communication is abnormal, and the power battery sampling is abnormal.

4. The battery management device according to claim 1, wherein, The main control unit is also configured to: In response to the fulfillment of a preset third protection condition, the isolation unit is controlled to shut down and permanently locked, thereby disconnecting the processing circuit from at least one of the first interface and the second interface.

5. The battery management device according to claim 4, wherein, The third protection condition includes: damage to the power battery management device.

6. The battery management device according to claim 1, wherein, The isolation unit includes a first isolation unit and a second isolation unit. The first isolation unit is used to control the connection or disconnection of the processing circuit with the first interface, and The second isolation unit is used to control the connection or disconnection of the processing circuit with the second interface.

7. The battery management device according to claim 6, wherein, Responding to the satisfaction of the first protection condition, controlling the isolation unit to shut down, thereby disconnecting the processing circuit from the second interface, includes: responding to the satisfaction of the first protection condition, controlling the second isolation unit to shut down, thereby disconnecting the processing circuit from the second interface, and In response to the first protection condition no longer being met, controlling the shut-off isolation unit to turn on, thereby connecting the processing circuit to the second interface includes: in response to the first protection condition no longer being met, controlling the second isolation unit to turn on, thereby connecting the processing circuit to the second interface.

8. The battery management device according to claim 7, wherein, The step of controlling the second isolation unit to shut down in response to the satisfaction of the first protection condition, thereby disconnecting the processing circuit from the second interface, includes: controlling the processing circuit to stop working in response to the satisfaction of the first protection condition, and then controlling the second isolation unit to shut down, thereby disconnecting the processing circuit from the second interface. Responding to the fact that the first protection condition is no longer met, controlling the second isolation unit to be turned on, thereby connecting the processing circuit to the second interface, includes: responding to the fact that the first protection condition is no longer met, controlling the second isolation unit to be turned on, thereby connecting the processing circuit to the second interface, and then controlling the processing circuit to start working.

9. The battery management device according to claim 6, wherein, In response to the satisfaction of the second protection condition, controlling the isolation unit to shut down, thereby disconnecting the processing circuit from the first interface and the second interface respectively, includes: in response to the satisfaction of the second protection condition, controlling the second isolation unit to shut down, and then controlling the first isolation unit to shut down, thereby disconnecting the processing circuit from the first interface and the second interface respectively. In response to receiving the recovery command and no longer meeting the second protection condition, controlling the shut-off isolation unit to turn on, thereby connecting the processing circuit to the first interface and the second interface respectively, includes: in response to receiving the recovery command and no longer meeting the second protection condition, controlling the first isolation unit to turn on, and then controlling the second isolation unit to turn on, thereby connecting the processing circuit to the first interface and the second interface respectively.

10. The battery management device according to claim 9, wherein, In response to the satisfaction of the second protection condition, controlling the second isolation unit to turn off, and then controlling the first isolation unit to turn off, thereby disconnecting the processing circuit from the first interface and the second interface respectively, includes: in response to the satisfaction of the second protection condition, controlling the processing circuit to stop working, then controlling the second isolation unit to turn off, and then controlling the first isolation unit to turn off, thereby disconnecting the processing circuit from the first interface and the second interface respectively, and In response to receiving the recovery command and no longer meeting the second protection condition, controlling the first isolation unit to turn on, and then controlling the second isolation unit to turn on, thereby connecting the processing circuit to the first interface and the second interface respectively, includes: in response to receiving the recovery command and no longer meeting the second protection condition, controlling the first isolation unit to turn on, then controlling the second isolation unit to turn on, and then controlling the processing circuit to start working, thereby connecting the processing circuit to the first interface and the second interface respectively.

11. The battery management device according to claim 4, wherein, In response to the satisfaction of the third protection condition, controlling the isolation unit to shut down and permanently lock, thereby disconnecting the processing circuit from at least one of the first interface and the second interface, includes: In response to the fulfillment of the third protection condition, the first isolation unit is controlled to be turned off and permanently locked, and then the second isolation unit is controlled to be turned off and permanently locked, thereby disconnecting the processing circuit from the first interface and the second interface.

12. A power battery device, comprising: Power battery; The power battery management device according to any one of claims 1 to 11, wherein the first interface of the power battery management device is connected to the power battery.

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