Battery system control method, control device, equipment, medium and program product

Abstract

The present application provides a control method, control device, equipment, medium and program product for a battery system, which belongs to the field of battery technology. The control method includes: in response to the battery system satisfying a first predetermined condition, determining that the battery system is in a first communication state, the first communication state indicates stopping detecting the state of at least one communication message in the battery system; after a first time period, sending a first power-off instruction, the first power-off instruction is used to indicate disconnecting the electrical connection of any one of at least one battery module. The control method can balance the states of each battery module without causing a vehicle communication failure after the electrical connection of the battery system is disconnected.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a control method, control device, equipment, medium and program product of a battery system. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In a battery system, multiple battery modules are often provided. These battery modules are all connected to the main circuit of the battery system. In the main circuit, a main circuit switch module is provided, which can control the electrical connection of the entire battery system. In order to facilitate more precise control of the battery system, each battery module is usually provided with independent switch modules, so that each battery module can be controlled separately. At present, when the vehicle needs to enter a high-voltage power-off state, the main circuit switch module and the switch module in the battery module are usually disconnected at the same time. At this time, the states of different circuit modules may be different, increasing the risk of abnormalities in the battery system during subsequent use. Summary of the invention

[0004] The present application aims to at least solve the technical problem in the background art that there are state differences between the battery modules after the electrical connection of the battery system is disconnected. To this end, one purpose of the present application is to provide a control method for a battery system to balance the states of the battery modules without causing vehicle communication failure after the electrical connection of the battery system is disconnected.

[0005] An embodiment of the first aspect of the present application provides a control method for a battery system, the battery system comprising at least one battery module, the control method comprising: in response to the battery system satisfying a first predetermined condition, determining that the battery system is in a first communication state, the first communication state indicating stop detecting the state of at least one communication message in the battery system; after a first time period, sending a first power-off instruction, the first power-off instruction being used to instruct disconnection of the electrical connection of any one of the at least one battery modules.

[0006] In the technical solution of the embodiment of the present application, when the battery system meets the first predetermined condition, the communication message detection is stopped, so that the state of the battery system is not mistakenly determined as a communication failure state. After the first time period, the first power-off instruction is sent, so that each battery module forms a loop with each other within the first time period, so that the charge fully flows and is balanced between each battery module, thereby improving the consistency of the state of each battery module after the power failure.

[0007] In some embodiments, after the first time period, sending the first power-off instruction includes: setting the battery status flag to the first status flag, the battery status flag is used to indicate the status of the battery system; after the first time period, sending the first power-off instruction; setting the battery status flag to the second status flag. After the battery status flag is set to the first status flag, sending the first power-off instruction and setting the battery status flag to the second status flag facilitates accurate determination of the status of the battery system and reduces the risk of misjudging the status of the battery system.

[0008] In some embodiments, the battery system further includes a first switch module connected to at least one battery module, and the first predetermined condition includes: the first switch module is disconnected. After the first switch module is disconnected, the state of the battery system is determined to be a first communication state, and the detection of the state of the communication message is stopped, so that after the main circuit of the battery system is disconnected, the state of the battery system is not mistakenly determined to be a communication abnormal state.

[0009] In some embodiments, the control method further includes: disconnecting the first switch module in response to receiving the second power-off instruction. When the second power-off instruction is received, the first switch module is disconnected, thereby disconnecting the main circuit of the battery system, so that the electrical connection of the battery system can be disconnected according to the use requirements, thereby improving the safety and controllability of the battery system.

[0010] In some embodiments, after the first time period, sending the first power-off instruction includes: in response to the battery system satisfying a second predetermined condition, after the first time period, sending the first power-off instruction. When the battery system satisfies the second predetermined condition, the first power-off instruction is sent after the first time period, thereby improving the safety of the battery system.

[0011] In some embodiments, the second predetermined condition includes: the battery system is in a working state or a charging state. When the battery system is in a working state or a charging state, the first power-off instruction is sent after a first delay time, so as to reduce the influence of the abnormal state of the battery system on the state balancing process of each battery module.

[0012] In some embodiments, the battery system further includes a non-power battery, and the second predetermined condition further includes: the output voltage of the non-power battery is greater than or equal to the first voltage threshold. When the output voltage of the non-power battery is within a normal range, the first power-off instruction is sent after a first delay, thereby reducing the impact of the abnormality of the non-power battery on the state balancing process of each battery module and improving the safety of the battery system.

[0013] In some embodiments, the control method further includes: within the first time period, in response to the battery system not satisfying the third predetermined condition, sending a first power-off instruction. When the battery system does not satisfy the third predetermined condition, sending the first power-off instruction disconnects the electrical connection of the battery module to improve the safety of the battery system.

[0014] In some embodiments, the battery system further includes a second switch module, and the third predetermined condition includes: the second switch module is turned on. The second switch module can be manually controlled to be turned on or off. Under normal circumstances, the second switch module is in the on state. If the second switch module is in the on state, the first power-off instruction is sent after the first delay time, so that the states of the battery modules are fully balanced.

[0015] In some embodiments, within the first time period, in response to the battery system not satisfying the third predetermined condition, sending the first power-off instruction includes: within the first time period, in response to the second switch module being disconnected, sending the first power-off instruction. When the battery system needs to be repaired, the second switch module is manually disconnected. When the second switch module is disconnected, the first power-off instruction is immediately sent to disconnect the electrical connection of the battery module to reduce the danger caused by live maintenance.

[0016] In some embodiments, the control method further includes: disconnecting the electrical connection of any one of the at least one battery module according to the first power-off instruction. When the first power-off instruction is received, the electrical connection of the corresponding battery module is disconnected, so that the electrical connection of the battery module can be disconnected according to the use requirements, thereby improving the safety and controllability of the battery system.

[0017] In some embodiments, each of the at least one battery module includes a third switch module, and according to the first power-off instruction, disconnecting the electrical connection of any one of the at least one battery module includes: disconnecting the corresponding third switch module in response to the battery module satisfying a fourth predetermined condition. When the battery module satisfies the predetermined condition, the third switch module in the battery module is disconnected, thereby reducing the possibility of the battery module being disconnected in an abnormal state and improving the safety of the control process.

[0018] In some embodiments, the fourth predetermined condition includes any one of the following: the current flowing through the battery module is less than the current threshold; or the current flowing through the battery module within the second time period is greater than or equal to the current threshold, and the second time period is greater than the time period threshold. By determining whether the battery module meets the fourth predetermined condition, it can be determined whether the battery module is in a state suitable for being disconnected, thereby reducing the possibility of abnormality when disconnecting the battery module.

[0019] In some embodiments, the third switch module includes a first switch and a second switch. In response to the battery module satisfying the third predetermined condition, disconnecting the corresponding second switch module includes: disconnecting the first switch in the corresponding third switch module in response to the battery module satisfying the fourth predetermined condition; disconnecting the second switch in the corresponding third switch module. Disconnecting the first switch and the second switch in sequence can achieve full balance of the states of the battery modules and improve the consistency of the states of the battery modules.

[0020] In some embodiments, the control method further includes: in response to the electrical connection of any one of the at least one battery module being disconnected, sending a power-off result instruction, the power-off result instruction being used to indicate that the electrical connection of the battery module is disconnected. After the electrical connection of the battery module is disconnected, the power-off result instruction is sent so that the status of the battery module where the battery module is located can be known in a timely manner.

[0021] An embodiment of the second aspect of the present application provides a control device for a battery system, the battery system comprising at least one battery module, the control device comprising: a first module, for determining that the battery system is in a first communication state in response to the battery system satisfying a first predetermined condition, the first communication state indicating stop detecting the state of at least one communication message in the battery system; a second module, for sending a first power-off instruction after a first time period, the first power-off instruction being used to instruct disconnection of the electrical connection of any one of the at least one battery module.

[0022] An embodiment of the third aspect of the present application provides a computing device, including: at least one processor; and at least one memory communicatively connected to the at least one processor, wherein the at least one memory stores instructions, and when the instructions are executed individually or collectively by the at least one processor, the computing device executes the control method in the above-mentioned embodiment.

[0023] An embodiment of the fourth aspect of the present application provides a computer-readable storage medium storing instructions, which, when executed individually or collectively by one or more processors of a computing device, cause the computing device to execute the control method of the above embodiment.

[0024] An embodiment of the fifth aspect of the present application provides a computer program product, including instructions, which, when executed individually or collectively by one or more processors of a computing device, cause the computing device to execute the control method in the above embodiment.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0027] Figure 1 A flowchart of a control method for a battery system according to some embodiments of the present application;

[0028] Figure 2 A schematic diagram of a flow chart of sending a first power-off instruction after a first time period in some embodiments of the present application;

[0029] Figure 3 A schematic diagram of a process of disconnecting the third switch module in some embodiments of the present application;

[0030] Figure 4 A schematic block diagram of a control device for a battery system according to some embodiments of the present application;

[0031] Figure 5 A schematic diagram of a computing device according to some embodiments of the present application;

[0032] Figure 6 Schematic diagram of a battery system according to some embodiments of the present application. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0035] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0036] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0038] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0039] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0040] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0042] In a battery system, a plurality of battery modules (including, for example, battery packs, battery modules, battery cells, etc.) are often provided. These battery modules are all connected to the main circuit of the battery system. In the main circuit, a main circuit switch module is provided, which can control the electrical connection of the entire battery system. When the main circuit switch module is disconnected, each battery module is disconnected from the main circuit of the battery system. In order to facilitate more precise control of the battery system, each battery module is usually provided with a switch module independent of each other, so that each battery module can be controlled separately. When the switch module in a battery module is disconnected, the electrical connection of the battery module is disconnected. At present, when the vehicle needs to enter the high-voltage power-down state, the switch modules in the main circuit switch module and each battery module are usually disconnected at the same time. Since the electrical connection of each battery module can be controlled independently of each other, when the switch modules in the main circuit switch module and the battery module are disconnected at the same time, the states of different battery modules may be different, for example, the charge stored on each battery module is inconsistent, etc., which will increase the risk of abnormality of the battery system during subsequent use.

[0043] In order to achieve balance of the states of each battery module without affecting the normal communication of the vehicle after the main circuit of the battery system and the electrical connections of each battery module are disconnected, it is possible to stop detecting the communication messages in the battery system when the battery system meets a first predetermined condition, and send a first power-off command after a first period of time, so that the battery modules form a loop with each other within the first period of time, and the states of each battery module are balanced through the flow of charge in the loop.

[0044] Using such a control method can improve the consistency of the states of each battery module and reduce the risk of abnormal use of the battery system due to inconsistent states of each battery module during subsequent use.

[0045] The control method disclosed in the embodiment of the present application can be used, but is not limited to, for battery systems used in electrical devices such as vehicles, ships or aircraft. The control method of the battery system disclosed in the present application can be used, which is conducive to balancing the states of each battery module and improving the consistency of the states of each battery module after the electrical connection of the battery system is disconnected.

[0046] The present application embodiment provides a control method 100 for a battery system. The battery system 10 includes at least one battery module 1. Figure 1 , the control method includes steps 110 to 120.

[0047] Step 110 : In response to the battery system 10 satisfying a first predetermined condition, determining that the battery system 10 is in a first communication state. The first communication state indicates a state in which detection of at least one communication message in the battery system 10 is stopped.

[0048] Step 120: after the first time period, send a first power-off instruction. The first power-off instruction is used to instruct to disconnect the electrical connection of any one of the at least one battery module 1.

[0049] In the embodiments of the present application, the term "battery module" may include a battery cell, or a series, parallel or mixed structure of multiple battery cells (for example, a battery pack or a battery module). In some embodiments, the battery module may also include peripheral circuits connected to the battery cell, battery pack or battery module, for example, it may include components such as relays, resistors, capacitors, etc. The term "battery system" may include a battery module and a control module corresponding to the battery module. In some embodiments, the control module may be a battery management unit (Battery Management Unit, referred to as BMU), a battery management system (Battery Management System, referred to as BMS), etc. Among them, the BMU may include a master battery management unit (Master Battery Management Unit, referred to as MBMU) connected to the main circuit of the battery system and a slave battery management unit (Slave Battery Management Unit, referred to as SBMU) connected to each battery module respectively. In some embodiments, multiple battery modules may also be arranged in a battery swap station or in different battery swap boxes, and connected to the main circuit of the battery system in the electric vehicle, and the main circuit can realize functions such as outputting voltage to the electric vehicle.

[0050] When the battery system 10 meets the first predetermined condition, the first time period is delayed, and the first power-off instruction is sent to disconnect the electrical connection of the corresponding battery module 1. During the first time period, the battery modules 1 are connected to each other and can form a loop with each other. The charge stored in each battery module 1 is transmitted in the loop. After the first time period, the status of each battery module 1 will tend to be consistent. At this time, the first power-off instruction is sent again to disconnect the electrical connection of the battery module 1, and there will be no significant difference in the status of each battery module 1. The specific process of balancing the status of each battery module 1 will be described in detail below.

[0051] In order to reduce the false detection of the state of the battery system, during the first delay period, the state of the battery system is determined to be a first communication state. In the first communication state, some communication messages in the battery system will no longer be detected.

[0052] The first duration can be designed according to the usage occasion. In one example, the first duration can be set to 20 minutes (min).

[0053] In some embodiments, the first power-off instruction may be sent by the MBMU to the SBMU.

[0054] When the battery system meets the first predetermined condition, the communication message detection is stopped, so that the vehicle state is not mistakenly determined as a communication failure state. After the first time period, the first power-off instruction is sent, so that each battery module forms a loop with each other within the first time period, so that the charge flows and is balanced between each battery module, thereby improving the consistency of the state of each battery module.

[0055] According to some embodiments of the present application, reference Figure 2 , step 120 includes steps 210 to 230.

[0056] Step 210 : Set the battery status flag to a first status flag. The battery status flag is used to indicate the status of the battery system 10 .

[0057] Step 220: After a first period of time, send a first power-off instruction.

[0058] Step 230: Set the battery status flag to a second status flag.

[0059] In an embodiment of the present application, the term "battery status flag" may be included in, for example, a register in a control module, or may be included in, for example, a control instruction issued by the control module. The battery status flag may be set to different status flags, thereby indicating that the battery system is in different states. In one example, the battery status flag may be set to 1 or 0. The battery status flag is set to 1 to indicate that the battery system is in a first state, and the battery status flag is set to 0 to indicate that the battery system is in a second state.

[0060] In some embodiments, the battery status flag is set to the first status flag to indicate that the battery system 10 is in a delayed state, in which the battery module 1 is electrically connected and timing is performed. The battery status flag is set to the second status flag to indicate that the battery system 10 is not in a delayed state.

[0061] When the battery system 10 meets the first predetermined condition, the battery status flag may be set to the first status flag immediately or at a later time, which is not limited in the present disclosure.

[0062] The first power-off instruction is not sent within the first time period after the battery status flag is set to the first status flag. After the first time period, the first power-off instruction is sent again to disconnect the electrical connection of the battery module 1. When sending the first power-off instruction, the battery status flag can be set to the second status flag to stop timing.

[0063] After the battery status flag is set to the first status flag, a first power-off instruction is sent after a first period of time, and the battery status flag is set to the second status flag, so as to accurately determine the status of the battery system and reduce the risk of misjudging the status of the battery system.

[0064] According to some embodiments of the present application, the battery system 10 further includes a first switch module 12 connected to at least one battery module 1. The first predetermined condition includes: the first switch module 12 is disconnected.

[0065] Figure 6 An example of a battery system 10 is shown. Figure 6 As shown, the first switch module 12 can be arranged in the main circuit 2 connected to the battery module 1, and a switch element such as a relay can be used. Figure 6 In the example shown, the first switch module 12 includes two switches S3 and S4 arranged on the main circuit 2 of the battery system 10. Switches S3 and S4 are respectively connected to the positive voltage terminal A and the negative voltage terminal B of the main circuit 2. When any one of the switches is disconnected, it can be considered that the first switch module 12 is disconnected. The positive voltage terminal A and the negative voltage terminal B of the main circuit 2 can be connected to a position such as a power system or a load device of an electric vehicle to output voltage thereto. It should be understood that in other embodiments, the number of switches included in the first switch module 12 and the setting position of the switches can be designed according to the use occasion, and the present disclosure does not limit this.

[0066] When the first switch module 12 is disconnected, Figure 6 As shown, at this time, the battery modules 1 are all disconnected from the main circuit 2. Since each battery module 1 is connected to the node C and the node D, when the first switch module 12 is disconnected, each battery module 1 will form a loop between each other through the node C and the node D. Therefore, when the first switch module 12 is disconnected, it is considered that the status of each battery module 1 can be equalized. In some embodiments, the battery status flag bit can also be set at this time, set to the first status flag, and start timing.

[0067] In some embodiments, after the first switch module 12 is disconnected, the main circuit 2 is disconnected, and the MBMU will stop sending certain communication messages, such as CAN bus (Controller Area Network Bus) messages, thermal management system (Thermal management system, referred to as TMS) messages, ACAN bus messages, etc. If these messages are still detected within the first time period, the state of the battery system may be mistakenly determined to be in a communication failure state, causing the battery system to be abnormal. Therefore, within the first time period, the battery system can be determined to be in the first communication state. In this state, the communication messages stopped by the MBMU will no longer be detected.

[0068] In some embodiments, the first predetermined condition can be set according to the state of the electric vehicle or the state of the charging pile connected to the electric vehicle. For example, it can also include receiving a high-voltage lowering instruction sent by a vehicle control unit (VCU) in the electric vehicle, detecting that the charging pile does not output voltage, and the electric vehicle is not in a battery replacement mode.

[0069] After the first switch module is disconnected, the state of the battery system is determined to be the first communication state, and the state of the communication message is stopped from being detected, so that the state of the battery system is not mistakenly determined to be a communication abnormal state after the main circuit of the battery system is disconnected.

[0070] According to some embodiments of the present application, the control method further includes:

[0071] In response to receiving the second power-off instruction, the first switch module 12 is disconnected.

[0072] In the example, the second power-off instruction is a control instruction from the VCU, for example, it may include a high-voltage down instruction sent by the VCU. The high-voltage down instruction is used to instruct the electric vehicle to power off the high voltage, that is, to control the battery system 10 to stop outputting voltage to the power system. Figure 6 As shown, after receiving the second power-off instruction, the first switch module 12 is disconnected. At this time, the connection between each battery module 1 and the positive voltage terminal A and the negative voltage terminal B of the main circuit 2 is disconnected, and no voltage is output thereto, thereby stopping the output of voltage to the power system.

[0073] In some embodiments, before sending the second power-off instruction, the VCU may determine the state of the electric vehicle, for example, whether the electric vehicle meets the high-voltage power-off condition, whether the high-voltage electrical appliances have been shut down, etc. When it is determined that the electric vehicle can safely achieve high-voltage power-off, the second power-off instruction is sent.

[0074] In some embodiments, the first switch module 12 may be disconnected by the MBMU.

[0075] When the second power-off instruction is received, the first switch module is disconnected, thereby disconnecting the main circuit of the battery system, so that the electrical connection of the battery system can be disconnected according to usage requirements, thereby improving the safety and controllability of the battery system.

[0076] According to some embodiments of the present application, step 120 includes:

[0077] In response to the battery system satisfying a second predetermined condition, a first power-off instruction is sent after a first period of time.

[0078] During the use of the battery system 10, some abnormal situations may occur. At this time, in order to improve the safety of the battery system 10, the electrical connection of the battery module 1 should be disconnected in time without delaying the power off of the battery module 1. When the battery system meets the second predetermined condition, the first power-off instruction is sent after the first time period.

[0079] When the battery system meets the second predetermined condition, the first power-off instruction is sent after the first delay time, thereby improving the safety of the battery system.

[0080] According to some embodiments of the present application, the second predetermined condition includes: the battery system 10 is in a working state or a charging state.

[0081] The abnormal situation of the battery system 10 may include, for example, a failure of a battery module 1, an abnormality of the MBMU or SBMU, etc., which results in failure to output voltage or charge normally. In order to improve the safety of the battery system 10, the first power-off instruction is sent after the first time period only when the battery system 10 is in a normal working state or charging state. When the battery system 10 is not in a normal working state or charging state, the electrical connection of the battery module 1 is disconnected in time.

[0082] When the battery system is in a working state or a charging state, the first power-off instruction is sent after a first delay, thereby reducing the influence of the abnormal state of the battery system on the state balancing process of each battery module.

[0083] According to some embodiments of the present application, the battery system 10 further includes a non-power battery (not shown). The second predetermined condition further includes: an output voltage of the non-power battery is greater than or equal to a first voltage threshold.

[0084] In an electric vehicle, in addition to each battery module 1, a non-power battery is usually provided. The non-power battery can realize functions such as waking up each battery module 1, and can use lead-acid batteries, lithium batteries and other battery forms. The output voltage of the non-power battery is usually set to 12 volts (V), 24 volts, 48 ​​volts, etc.

[0085] When the output voltage of the non-power battery is low, the state balancing process of each battery module 1 may not proceed normally. Therefore, when the output voltage of the non-power battery is less than the first voltage threshold, the battery module 1 is not powered off for a long time, but the electrical connection of the battery module 1 is disconnected in time.

[0086] The first voltage threshold can be designed according to the application scenario. For example, when the non-power battery uses a lead-acid battery with an output voltage of 24 V, the first voltage threshold can be set to 22 V. The present disclosure does not limit the specific setting value of the first voltage threshold.

[0087] When the output voltage of the non-power battery is within the normal range, the first power-off instruction is sent after the first delay, thereby reducing the impact of the non-power battery abnormality on the state balancing process of each battery module and improving the safety of the battery system.

[0088] According to some embodiments of the present application, the control method further includes:

[0089] In the first time period, in response to the battery system 10 not satisfying the third predetermined condition, a first power-off instruction is sent.

[0090] For the battery system 10, if some abnormalities occur, manual maintenance may be required. Therefore, a third predetermined condition needs to be set. When the battery system 10 does not meet the third predetermined condition, even if the battery system 10 is in a delayed state, the first power-off instruction is immediately sent to disconnect the electrical connection of the corresponding battery module 1.

[0091] When the battery system does not meet the third predetermined condition, a first power-off instruction is sent to disconnect the electrical connection of the battery module, thereby improving the safety of the battery system.

[0092] According to some embodiments of the present application, the battery system 10 further includes a second switch module (not shown). The third predetermined condition includes: the second switch module is turned on.

[0093] In one example, the second switch module may be a manual service disconnect (MSD). The MSD may be turned on or off by manual control. Under normal circumstances, maintenance personnel will not unplug the MSD, and the MSD is in the on state.

[0094] If the second switch module is in the on state, the first power-off instruction is sent after a first delay time, so that the states of the battery modules are fully balanced.

[0095] According to some embodiments of the present application, within the first time period, in response to the battery system not satisfying the third predetermined condition, sending the first power-off instruction includes:

[0096] Within the first time period, in response to the second switch module being disconnected, a first power-off instruction is sent.

[0097] During the first time period, the battery system 10 is in a delayed state, the main circuit switch module has been disconnected, but the switch modules in each battery module 1 have not been disconnected. If the battery system 10 is repaired at this time, safety problems may arise due to live operation. When maintenance personnel repair the battery system 10, the MSD needs to be unplugged. Therefore, when the MSD is unplugged and disconnected, the first power-off instruction is immediately sent, the battery system 10 exits the delayed state, and the corresponding battery module 1 is disconnected. In some embodiments, when the first power-off instruction is sent or after the first power-off instruction is sent, the battery status flag can also be set to a second status flag to indicate that the battery system 10 exits the delayed state.

[0098] When the second switch module is disconnected, the first power-off instruction is immediately sent to disconnect the electrical connection of the battery module, thereby reducing the danger caused by live maintenance.

[0099] According to some embodiments of the present application, the control method further includes:

[0100] According to the first power-off instruction, the electrical connection of any one of the at least one battery module 1 is disconnected.

[0101] In some embodiments, the first power-off instruction is issued by the MBMU connected to the main circuit 2 of the battery system 10, and is transmitted to the SBMUs respectively connected to the battery modules 1. For each battery module 1, there is usually an SBMU connected thereto. When the SBMU receives the first power-off instruction sent by the MBMU, it controls the electrical connection of the battery module 1 to be disconnected.

[0102] When the first power-off instruction is received, the electrical connection of the corresponding battery module is disconnected, so that the electrical connection of the battery module can be disconnected according to usage requirements, thereby improving the safety and controllability of the battery system.

[0103] According to some embodiments of the present application, each battery module 1 in the at least one battery module 1 includes a third switch module 13. According to the first power-off instruction, disconnecting the electrical connection of any battery module 1 in the at least one battery module 1 includes:

[0104] In response to the battery module 1 satisfying the fourth predetermined condition, the corresponding third switch module 13 is turned off.

[0105] like Figure 6As shown, each battery module 1 includes a battery 11 (including a battery cell, a battery module, a battery pack, etc.) and a third switch module 13. The battery 11 is connected to the main circuit 2 of the battery system 10 through the third switch module 13. When the SBMU connected to the battery module receives the first power-off instruction, the state of the battery module will be determined. If the state of the battery module meets the fourth predetermined condition, it is considered that the electrical connection of the battery module can be safely disconnected, and the third switch module 13 in the battery module can be disconnected.

[0106] When the battery module meets the predetermined condition, the third switch module in the battery module is disconnected, thereby reducing the possibility of the battery module being disconnected in an abnormal state and improving the safety of the control process.

[0107] According to some embodiments of the present application, the fourth predetermined condition includes any one of the following:

[0108] The current flowing through the battery module 1 is less than the current threshold; or

[0109] The current flowing through the battery module 1 during the second time period is greater than or equal to the current threshold. The second time period is greater than the time period threshold.

[0110] In the process of delaying the power off of each battery module 1 for state balancing, the charge will flow in the loop formed by each battery module 1 to form a current. As the states of each battery module 1 gradually become consistent, the current flowing through the battery module 1 will gradually decrease. Therefore, when the current flowing through the battery module 1 is small, it can be considered that the state consistency of each battery module 1 is good, and the second switch module 13 can be disconnected at this time. The current threshold can be designed according to the use scenario. In one example, the current threshold can be set to 15 amperes (A).

[0111] If the current flowing through the battery module 1 does not reach a state less than the current threshold for a long time, in order to improve the control efficiency, the second switch module 13 may be disconnected to disconnect the electrical connection of the battery module 1. The duration threshold and the second duration may be designed according to the application scenario. In one example, the second duration may be set to exceed the duration threshold by 5 seconds (s).

[0112] By determining whether the battery module satisfies the fourth predetermined condition, it is possible to determine whether the battery module is in a state suitable for being disconnected, thereby reducing the possibility of abnormality occurring when disconnecting the battery module.

[0113] According to some embodiments of the present application, the third switch module 13 includes a first switch S1 and a second switch S2. In response to the battery module 1 satisfying the fourth predetermined condition, disconnecting the corresponding third switch module 13 includes a process 300. Figure 3, process 300 includes steps 310 to 320.

[0114] Step 310 : in response to the battery module 1 satisfying a fourth predetermined condition, disconnecting the first switch S1 in the corresponding third switch module 13 .

[0115] Step 320 , disconnect the second switch S2 in the corresponding third switch module 13 .

[0116] like Figure 6 As shown, each third switch module 13 includes a first switch S1 and a second switch S2. The two switches may use switch elements such as relays. When the battery module 1 meets the fourth predetermined condition, the first switch S1 and the second switch S2 may be disconnected in sequence.

[0117] By disconnecting the first switch and the second switch in sequence, the states of the battery modules can be fully balanced, thereby improving the consistency of the states of the battery modules.

[0118] According to some embodiments of the present application, the control method further includes:

[0119] In response to the electrical connection of any one of the at least one battery module 1 being disconnected, a power-off result instruction is sent. The power-off result instruction is used to indicate that the electrical connection of the battery module 1 is disconnected.

[0120] After the electrical connection of the battery module 1 is disconnected, the SBMU connected to the battery module 1 may send a power-off result instruction, which will be transmitted to the MBMU or VCU, etc., so that the electric vehicle can know the status of each battery module 1 .

[0121] After the electrical connection of the battery module is disconnected, a power-off result instruction is sent so that the status of the battery module where the battery module is located can be known in time.

[0122] In some embodiments, the battery system 10 does not meet the first predetermined condition, for example, it may not receive the high-voltage command sent by the VCU, detect that the charging pile is still outputting voltage, or the electric vehicle is in a battery replacement mode, etc. In this case, there is no need to balance the status of each battery module 1, and the electrical connection of the battery module 1 can be disconnected.

[0123] After determining that the battery system 10 does not meet the first predetermined condition, the first power-off instruction can be sent immediately and the battery status flag can be set to the second status flag, or the first power-off instruction can be sent at a later time and the battery status flag can be set to the second status flag, which is not limited in the present disclosure.

[0124] When the battery system does not meet the first predetermined condition, a first power-off instruction is sent to disconnect the electrical connection of the corresponding battery module as needed, thereby improving the safety and reliability of the battery system.

[0125] Based on the same technical concept, the embodiment of the present application provides a control device for a battery system. The embodiment of the control device can refer to the embodiment of the control method, and the repeated parts will not be repeated. Figure 4 , the control device 400 includes a first module 410 and a second module 420 .

[0126] The first module 410 is used to determine that the battery system 10 is in a first communication state in response to the battery system 10 satisfying a first predetermined condition. The first communication state indicates a state in which detection of at least one communication message in the battery system 10 is stopped.

[0127] The second module 420 is used to send a first power-off instruction after a first time period. The first power-off instruction is used to instruct to disconnect the electrical connection of any battery module 1 in the at least one battery module 1.

[0128] The first module 410 in the control device 400 may correspond to Figure 1 In step 110 of the control method 100 shown, the second module 420 may correspond to step 120 of the control method 100, and for the sake of brevity, it is not repeated here. It should be understood that corresponding to the embodiment of the control method 100, the embodiment of the control device 400 may also include more modules.

[0129] It should be noted that the functions of the various modules discussed herein can be divided into multiple modules, and / or at least some functions of multiple modules can be combined into a single module. The specific module discussed herein performing an action includes the specific module itself performing the action, or alternatively the specific module calling or otherwise accessing another component or module that performs the action (or performs the action in conjunction with the specific module). Therefore, the specific module that performs an action can include the specific module itself that performs the action and / or another module that the specific module calls or otherwise accesses and performs the action.

[0130] It should also be understood that various techniques may be described herein in the general context of software hardware elements or program modules. Figure 4The various modules described can be implemented in hardware or in hardware in combination with software and / or firmware. For example, these modules can be implemented as computer program code / instructions, which are configured to be executed in one or more processors and stored in a computer-readable storage medium. Alternatively, these modules can be implemented as hardware logic / circuits. The hardware logic / circuit may include an integrated circuit chip (which includes a processor (e.g., a central processing unit (CPU), a microcontroller, a microprocessor, a digital signal processor (DSP), etc.), a memory, one or more communication interfaces, and / or one or more components in other circuits), and may optionally execute the received program code and / or include embedded firmware to perform functions.

[0131] The present application embodiment provides a computing device 500, such as Figure 5 shown. Figure 5 An example configuration of a computing device 500 that can be used to implement the control method 100 described herein is shown. For example, the control apparatus 400 described above can be implemented in whole or at least in part by the computing device 500 or a similar device or system.

[0132] The computing device 500 may include at least one processor 505, which can communicate with each other, such as through a bus 504 or other appropriate connections, a memory 507, (multiple) communication interfaces 502, a display device 501, other input / output (I / O) devices 503, and one or more mass storage devices 506. The memory 507 stores instructions, which, when executed by the processor 505, cause the processor 505 to perform the control method as described in the above embodiments.

[0133] The computing device 500 can be a variety of different types of devices. Examples of computing device 500 include, but are not limited to, desktop computers, server computers, laptop or netbook computers, mobile devices (e.g., tablet computers, cellular or other wireless phones (e.g., smart phones), notepad computers, mobile stations), wearable devices (e.g., glasses, watches), entertainment devices (e.g., entertainment appliances, set-top boxes communicatively coupled to a display device, game consoles), televisions or other display devices, automotive computers, and the like.

[0134] The processor 505 may be a single processing unit or multiple processing units, all of which may include a single or multiple computing units or multiple cores. The processor 505 may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuits, and / or any device that manipulates signals based on operating instructions. Among other capabilities, the processor 505 may be configured to obtain and execute computer-readable instructions stored in the memory 507, mass storage device 506, or other computer-readable media, such as program codes of an operating system 508, program codes of an application program 509, program codes of other programs 510, and the like.

[0135] The memory 507 and the mass storage device 506 are examples of computer-readable storage media for storing instructions, which are executed by the processor 505 to implement the various functions described above. For example, the memory 507 may generally include both volatile memory and non-volatile memory (e.g., RAM, ROM, etc.). In addition, the mass storage device 506 may generally include a hard disk drive, a solid-state drive, a removable medium, including external and removable drives, a memory card, a flash memory, a floppy disk, an optical disk (e.g., CD, DVD), a storage array, a network attached storage, a storage area network, etc. The memory 507 and the mass storage device 506 may all be collectively referred to herein as memory or computer-readable storage media, and may be a non-transitory medium capable of storing computer-readable, processor-executable program instructions as computer program code, which may be executed by the processor 505 as a specific machine configured to implement the operations and functions described in the examples herein.

[0136] A plurality of programs may be stored on the mass storage device 506. These programs include an operating system 508, one or more application programs 509, other programs 510, and program data 511, and they may be loaded into the memory 507 for execution. Examples of such application programs or program modules may include, for example, computer program logic (e.g., computer program code or instructions) for implementing the following components / functions: the control device 400 (including the first module 410 and the second module 420), the control method 100 (including any suitable steps of the control method 100), and / or other embodiments described herein.

[0137] Although in Figure 5 500 , but operating system 508 , application programs 509 , other programs 510 , and program data 511 , or portions thereof, may be implemented using any form of computer-readable media accessible by computing device 500 .

[0138] One or more communication interfaces 502 are used to exchange data with other devices, such as through a network, direct connection, etc. Such communication interfaces can be one or more of the following: any type of network interface (e.g., a network interface card (NIC)), a wired or wireless (such as IEEE 802.11 wireless LAN (WLAN)) wireless interface, a Worldwide Interoperability for Microwave Access (Wi-MAX) interface, an Ethernet interface, a Universal Serial Bus (USB) interface, a cellular network interface, a Bluetooth™ interface, a Near Field Communication (NFC) interface, etc. The communication interface 502 can facilitate communication within a variety of network and protocol types, including wired networks (e.g., LAN, cable, etc.) and wireless networks (e.g., WLAN, cellular, satellite, etc.), the Internet, etc. The communication interface 502 can also provide communication with an external storage device (not shown) such as a storage array, a network attached storage, a storage area network, etc.

[0139] In some examples, a display device 501 such as a monitor may be included for displaying information and images to a user. Other I / O devices 503 may be devices that receive various inputs from a user and provide various outputs to the user, and may include a touch input device, a gesture input device, a camera, a keyboard, a remote control, a mouse, a printer, an audio input / output device, and the like.

[0140] The technology described herein can be supported by these various configurations of the computing device 500 and is not limited to the specific examples of the technology described herein. For example, the functionality can also be implemented in whole or in part on the "cloud" by using a distributed system. The cloud includes and / or represents a platform for resources. The platform abstracts the underlying functionality of the hardware (e.g., server) and software resources of the cloud. Resources can include applications and / or data that can be used when performing computing processing on a server away from the computing device 500. Resources can also include services provided over the Internet and / or through a subscriber network such as a cellular or Wi-Fi network. The platform can abstract resources and functions to connect the computing device 500 to other computer devices. Therefore, the implementation of the functions described herein can be distributed throughout the cloud. For example, the functions can be implemented partially on the computing device 500 and partially through a platform that abstracts the functions of the cloud.

[0141] In some embodiments, the computing device 500 may be disposed on an electric vehicle, for example, it may be a battery management unit, a battery management system, etc. of the electric vehicle. It should be understood that the computing device 500 may also include multiple devices designed separately from each other, such as a master battery management unit and a slave battery management unit.

[0142] An embodiment of the present application also provides a computer-readable storage medium having instructions stored thereon. When the instructions are executed individually or collectively by one or more processors of a computing device, the computing device executes a control method as described in any of the above embodiments.

[0143] Computer-readable storage media include volatile and nonvolatile, removable and non-removable media implemented by any method or technology for storage of information, such as computer-readable instructions, data structures, program modules, or other data. Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD), or other optical storage devices, magnetic cassettes, magnetic tapes, magnetic disk storage devices or other magnetic storage devices, or any other non-transmission media that can be used to store information for access by a computer device.

[0144] An embodiment of the present application also provides a computer program product, including instructions, which, when executed individually or collectively by one or more processors of a computing device, enable the computing device to execute a control method as described in any of the above embodiments.

[0145] A specific embodiment of the present application is described below. It should be understood that this specific embodiment is described for illustrative purposes only and should not be interpreted as limiting the present application.

[0146] like Figure 6 As shown, after receiving the second power-off instruction from the VCU, the first switch module 12 is disconnected. After the first switch module 12 is disconnected, it can be considered that the battery system 10 meets the first predetermined condition, and it can be further determined that the charging pile does not output voltage and the electric vehicle is not in the battery replacement mode. Determine that the battery system 10 is in the first communication state, and stop detecting at least one communication message in the battery system 10. Set the battery status flag to the first status flag (for example: set to 1). At this time, each battery module 1 will form a loop between each other through node C and node D, and the charge flows in the loop, thereby balancing the status of each circuit module.

[0147] If the battery system 10 is in working state or charging state and the output voltage of the non-power battery in the battery system 10 is greater than or equal to the first threshold, it can be considered that the battery system 10 meets the second predetermined condition. After the first time period, the MBMU sends a first power-off instruction to the SBMU and sets the battery status flag to the second status flag (for example, set to 0). After the SBMU receives the first power-off instruction, it will detect the current flowing through the battery module 1 and start timing. When the current flowing through the battery module 1 is less than the current threshold or the current flowing through the battery module 1 within the second time period is greater than or equal to the current threshold, it is considered that the battery module 1 meets the fourth predetermined condition, and the first switch S1 and the second switch S2 in the battery module 1 are disconnected.

[0148] If the second switch module of the battery system 10 is disconnected within the first time period, a first power-off instruction is immediately sent, and the battery status flag is set to the second status flag.

[0149] If the battery system 10 does not meet the second predetermined condition, for example, the battery system 10 is not in a working state or a charging state, or the output voltage of the low-voltage auxiliary battery in the battery system 10 is less than the first threshold or there is no output voltage, the MBMU sends a first power-off instruction to the SBMU and sets the battery status flag to the second status flag.

[0150] If the battery system 10 does not meet the first predetermined condition, for example, the first switch module 12 is not disconnected, the charging pile is still outputting voltage, or the electric vehicle is in a battery replacement mode, the MBMU sends a first power-off instruction to the SBMU and sets the battery status flag to the second status flag.

[0151] After the first switch S1 and the second switch S2 are both disconnected, the SBMU sends a power-off result instruction, indicating that the electrical connection of the battery module 1 is disconnected.

[0152] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for controlling a battery system, characterized in that: The battery system comprises a plurality of battery modules, a main circuit connected to the plurality of battery modules, and a first switch module connected to the plurality of battery modules, wherein the first switch module is arranged in the main circuit, and the plurality of battery modules are configured to form a loop when the first switch module is disconnected, and the control method comprises: In response to the battery system satisfying a first predetermined condition, determining that the battery system is in a first communication state, the first predetermined condition comprising that the first switch module is disconnected, and the first communication state indicates a state where detection of at least one communication message in the battery system is stopped; After the first switch module is disconnected for a first time period, a first power-off instruction is sent, and the multiple battery modules form a loop during the first time period. The first power-off instruction is used to instruct to disconnect the electrical connection of any one of the multiple battery modules.

2. The control method according to claim 1, characterized in that: After the first switch module is disconnected for a first time period, sending a first power-off instruction includes: Setting a battery status flag bit to a first status flag, wherein the battery status flag bit is used to indicate the status of the battery system; After the first switch module is disconnected for a first time period, sending the first power-off instruction; The battery status flag is set as a second status flag.

3. The control method according to claim 1, characterized in that: The control method further comprises: In response to receiving the second power-off instruction, the first switch module is disconnected.

4. The control method according to claim 1, characterized in that: After the first switch module is disconnected for a first time period, sending a first power-off instruction includes: In response to the battery system satisfying a second predetermined condition, the first power-off instruction is sent after the first switch module is disconnected for a first time period.

5. The control method according to claim 4, characterized in that: The second predetermined condition includes: The battery system is in a working state or a charging state.

6. The control method according to claim 5, characterized in that: The battery system further includes a non-power battery, and the second predetermined condition further includes: The output voltage of the non-power battery is greater than or equal to a first voltage threshold.

7. The control method according to any one of claims 1 to 6, characterized in that: The control method further comprises: The first power-off instruction is sent in response to the battery system not satisfying a third predetermined condition within a first time period when the first switch module is disconnected.

8. The control method according to claim 7, characterized in that: The battery system further includes a second switch module, and the third predetermined condition includes: The second switch module is turned on.

9. The control method according to claim 8, characterized in that: The sending of the first power-off instruction in response to the battery system not satisfying a third predetermined condition within a first time period when the first switch module is disconnected includes: The first power-off instruction is sent in response to the second switch module being disconnected within a first time period when the first switch module is disconnected.

10. The control method according to any one of claims 1 to 6, characterized in that: The control method further comprises: In response to receiving the first power-off instruction, the electrical connection of any one of the plurality of battery modules is disconnected.

11. The control method according to claim 10, characterized in that: Each of the plurality of battery modules includes a third switch module, and in response to receiving the first power-off instruction, disconnecting the electrical connection of any one of the plurality of battery modules includes: In response to the battery module satisfying a fourth predetermined condition, the corresponding third switch module is disconnected.

12. The control method according to claim 11, characterized in that: The fourth predetermined condition includes any one of the following: The current flowing through the battery module is less than a current threshold; or The current flowing through the battery module within a second time period is greater than or equal to the current threshold, and the second time period is greater than the time period threshold.

13. The control method according to claim 11 or 12, characterized in that: The third switch module includes a first switch and a second switch, and in response to the battery module satisfying a fourth predetermined condition, disconnecting the corresponding third switch module includes: In response to the battery module satisfying the fourth predetermined condition, disconnecting the first switch in the corresponding third switch module; The second switch in the corresponding third switch module is turned off.

14. The control method according to any one of claims 1 to 6, characterized in that: The control method further comprises: In response to the electrical connection of any one of the plurality of battery modules being disconnected, a power-off result instruction is sent, wherein the power-off result instruction is used to indicate that the electrical connection of the battery module is disconnected.

15. A control device for a battery system, characterized in that: The battery system comprises a plurality of battery modules, a main circuit connected to the plurality of battery modules, and a first switch module connected to the plurality of battery modules, wherein the first switch module is arranged in the main circuit, and the plurality of battery modules are configured to form a loop when the first switch module is disconnected, and the control device comprises: A first module, configured to determine that the battery system is in a first communication state in response to the battery system satisfying a first predetermined condition, wherein the first predetermined condition includes that the first switch module is disconnected, and the first communication state indicates a state where detection of at least one communication message in the battery system is stopped; The second module is used to send a first power-off instruction after the first switch module is disconnected for a first time period, and the multiple battery modules form a loop during the first time period. The first power-off instruction is used to instruct to disconnect the electrical connection of any one of the multiple battery modules.

16. A computing device, characterized in that: include: at least one processor; as well as At least one memory is communicatively connected to the at least one processor, wherein the at least one memory stores instructions, and when the instructions are executed by the at least one processor individually or collectively, the computing device executes the control method according to any one of claims 1 to 14.

17. A computer-readable storage medium, characterized in that: Instructions are stored, which, when executed individually or collectively by one or more processors of a computing device, cause the computing device to perform the control method according to any one of claims 1 to 14.

18. A computer program product, characterized in that The method comprises instructions which, when executed individually or collectively by one or more processors of a computing device, cause the computing device to perform the control method according to any one of claims 1 to 14.

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