Battery control system, work vehicle, and control method

Abstract

To properly determine a failure of a battery pack.SOLUTION: A battery control system 1 includes a plurality of battery packs 10 connected in parallel and a controller 50. The controller 50 stores in the storage component 51 the battery pack 10 that will be connected to the load first the next time the system is started up. At start up, the stored battery pack 10 is first connected to the load. After executing the connection process for the stored battery pack 10, a failure of the battery pack 10 for which the connection process was executed first is detected. If a fault has not been detected, a battery pack 10 that is different from the battery pack 10 connected to the load first on the most recent startup is stored in the storage component 51 as the battery pack 10 to be connected to the load first on the next startup. If a fault is detected, a battery pack 10 that is different from the battery pack 10 that was first connected to the load during the most recent startup and that is not the battery pack 10 in which a fault was detected is stored in the storage component 51 as the battery pack 10 to be first connected to the load during the next startup.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a battery control system, a work vehicle, and a control method. [Background technology]

[0002] Patent document 1 discloses a battery monitoring device that is installed in multiple battery devices and includes a relay that connects the battery to a load and a precharge relay that prevents inrush current from flowing from the battery to the load, and monitors the status of the battery devices. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-164897 Summary of the Invention [Problem to be solved by the invention]

[0004] Each battery pack is provided with a precharge connection member such as a precharge relay. When multiple battery packs are connected in parallel, the precharge connection member of one of the battery packs is turned on at startup to precharge the capacitor on the load side (secondary side).

[0005] However, if the precharge connector of the same battery pack is turned on and precharged every time the battery pack is started up, there is a risk that a malfunction in the precharge connector of another battery pack may go unnoticed. [Means for solving the problem]

[0006] According to the present disclosure, there is provided a battery control system including a plurality of battery packs connected in parallel and a controller controlling the battery packs, wherein the controller stores in a memory unit the battery pack that will be first connected to a load at the next startup, connects the stored battery pack to the load first at startup, and after executing a connection process for the stored battery pack, detects a fault in the battery pack that first executed the connection process, and if a fault in the battery pack that first executed the connection process is not detected, stores in the memory unit a battery pack different from the battery pack that was first connected to the load at the most recent startup as the battery pack that will be first connected to the load at the next startup, and if a fault is detected in the battery pack that first executed the connection process, stores in the memory unit a battery pack other than the battery pack in which a fault was detected that is different from the battery pack that was first connected to the load at the most recent startup as the battery pack that will be first connected to the load at the next startup.

[0007] According to the present disclosure, there is provided a work vehicle including the above-described battery control system and a work implement.

[0008] According to the present disclosure, there is provided a control method including: storing in a memory unit, among a plurality of battery packs connected in parallel, a battery pack that will be first connected to a load at the next startup; connecting the stored battery pack to the load first at startup; executing a connection process for the stored battery pack; detecting a fault in the battery pack that first executed the connection process; if a fault in the battery pack that first executed the connection process is not detected, storing in the memory unit a battery pack different from the battery pack that was first connected to the load at the most recent startup as the battery pack that will be first connected to the load at the next startup; and if a fault is detected in the battery pack that first executed the connection process, storing in the memory unit a battery pack other than the battery pack in which the fault was detected that is different from the battery pack that was first connected to the load at the most recent startup as the battery pack that will be first connected to the load at the next startup. [Effects of the Invention]

[0009] According to the present disclosure, a failure in a battery pack can be appropriately determined. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram illustrating an example of a battery control system according to an embodiment. [Figure 2] FIG. 2 is a block diagram illustrating an example of a battery pack according to the embodiment. [Figure 3] FIG. 3 is a block diagram showing a controller of the battery control system according to the embodiment. [Figure 4] FIG. 4 is a block diagram illustrating a computer system according to an embodiment. [Figure 5] FIG. 5 is a flowchart showing a battery control method according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings, but the present disclosure is not limited thereto. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

[0012] [Embodiment] <Battery control system> Fig. 1 is a block diagram showing an example of a battery control system according to an embodiment. Fig. 2 is a block diagram showing an example of a battery pack according to an embodiment. In the embodiment, the battery control system 1 is applied to a work vehicle driven by a battery. The battery control system 1 includes a plurality of battery packs 10 connected in parallel, a power distribution unit (PDU) 20, and a controller 50.

[0013] The battery control system 1 includes a plurality of battery packs connected in parallel. In the embodiment, the battery control system 1 includes a first battery pack 101 and a second battery pack 102. The first battery pack 101 and the second battery pack 102 are electrically connected in parallel. When there is no particular need to distinguish between the first battery pack 101 and the second battery pack 102, they will be described as a battery pack 10. The number of battery packs 10 may be more than one and is not limited to two.

[0014] The battery pack 10 includes a battery 11, a negative electrode main connection member 12, a pre-charge connection member 15, a resistor 16, and a positive electrode main connection member (main connection member) 17. The battery pack 10 is electrically connected to a power distribution device 20 via a positive electrode terminal 10a and a negative electrode terminal 10b.

[0015] An identification number is assigned to the battery pack 10 for identification purposes. In the embodiment, the battery packs 10 are assigned consecutive numbers.

[0016] The battery 11 has a plurality of battery cells electrically connected in series. A disconnect switch (not shown) may be electrically connected to the positive electrode side of the battery 11. A negative electrode main connecting member 12 is electrically connected to the negative electrode side of the battery 11.

[0017] The negative electrode main connection member 12 is electrically connected to the negative electrode side of the battery 11. The negative electrode main connection member 12 is disposed between the negative electrode of the battery 11 and the terminal 10b. The negative electrode main connection member 12 may be any device capable of switching the main circuit in the battery pack 10 between ON and OFF, and may be, for example, a relay, a contactor, an IGBT (Insulated Gate Bipolar Transistor), a switching element, or the like. The negative electrode main connection member 12 is controlled to be turned ON and OFF by a command from the controller 50. The negative electrode main connection member 12 is turned ON together with the precharge connection member 15 when precharging is performed.

[0018] The precharge connection member 15 switches the precharge circuit using the battery 11 between ON and OFF. The precharge connection member 15 is electrically connected to the positive electrode side of the battery 11. The precharge connection member 15 is electrically connected in parallel with the positive electrode main connection member 17. The precharge connection member 15 is electrically connected between the positive electrode side of the battery 11 and the resistor 16. The precharge connection member 15 may be any device that can switch the precharge circuit in the battery pack 10 between ON and OFF, and may be, for example, a relay, a contactor, an IGBT, a switching element, or the like. The precharge connection member 15 is controlled to be ON or OFF by a command from the controller 50. The precharge connection member 15 is turned ON when precharging is performed. The precharge connection member 15 is turned OFF after precharging is completed.

[0019] The resistor 16 is electrically connected to the positive electrode side of the battery 11. The resistor 16 is electrically connected in series with the pre-charge connection member 15. The resistor 16 is electrically connected in parallel with the positive electrode main connection member 17. The resistor 16 is disposed between the pre-charge connection member 15 and the terminal 10a.

[0020] The positive electrode main connection member 17 is electrically connected to the positive electrode side of the battery 11. The positive electrode main connection member 17 is electrically connected in parallel with a precharge circuit composed of the precharge connection member 15 and resistor 16. The positive electrode main connection member 17 is electrically connected between the positive electrode side of the battery 11 and the terminal 10a. The positive electrode main connection member 17 may be any device that can switch the circuit in the battery pack 10 between ON and OFF, and may be, for example, a relay, a contactor, an IGBT, a switching element, or the like. The positive electrode main connection member 17 is controlled to be ON or OFF by a command from the controller 50. The positive electrode main connection member 17 is turned OFF when precharge is performed. The positive electrode main connection member 17 is turned ON after precharge is completed.

[0021] The power distribution device 20 is a distribution device that distributes the power supplied from the battery pack 10 to the load side. The power distribution device 20 is electrically connected to the battery pack 10, the on-board charger 43, and the inverter 45.

[0022] The charging port 42 is electrically connected to an on-board charger 43.

[0023] The on-vehicle charger 43 is a charger mounted on the vehicle. The on-vehicle charger 43 is electrically connected to the terminals 20e and 20f of the power distribution device 20.

[0024] The inverter 45 is electrically connected to the power distribution device 20 via terminals 20g and 20h. A motor 46, which is a load, is connected to the inverter 45. The inverter 45 includes a capacitor (not shown).

[0025] <controller> 3 is a block diagram showing a controller of a battery control system according to an embodiment. The controller 50 controls the battery pack 10. The controller 50 is electrically connected to the battery pack 10, the power distribution device 20, the on-board charger 43, and the inverter 45. The controller 50 includes a numerical calculation device (processor) such as a CPU (Central Processing Unit). The controller 50 is configured with one or more numerical calculation devices.

[0026] The functions implemented by the controller 50 will be described.

[0027] The controller 50 The battery pack 10 to be first connected to the load at the next startup is stored in the memory unit 51, At startup, the stored battery pack 10 that connects to the load first is connected to the load first; After executing the stored connection process for the battery pack 10, a failure is detected in the battery pack 10 that first executed the connection process, If no failure is detected in the battery pack 10 that first executed the connection process, a battery pack 10 different from the battery pack 10 that was first connected to the load at the most recent startup is stored in the memory unit 51 as the battery pack 10 that will be first connected to the load at the next startup; When a failure is detected in the battery pack 10 that first executed the connection process, a battery pack 10 other than the battery pack 10 in which the failure was detected, which is different from the battery pack 10 that was first connected to the load at the most recent startup, is stored in the memory unit 51 as the battery pack 10 to be first connected to the load at the next startup. It has the following function.

[0028] The controller 50 The battery pack 10 is first connected to the load, and the precharge connection member 15 of the battery pack 10 is connected to the load after precharge is performed. It has the following function.

[0029] The controller 50 If no failure is detected in the battery pack 10 that has been first connected, the connection process is performed on all battery packs 10 other than the battery pack 10 that has been first connected; When a failure is detected in the battery pack 10 that first executed the connection process, the connection process is performed on one of the battery packs 10 other than the battery pack 10 that first executed the connection process. It has the following function.

[0030] The controller 50 If no failure is detected in the battery pack 10 that first executed the connection process, the battery pack 10 numbered next to the number of the battery pack 10 that was first connected to the load at the most recent startup is stored in the storage unit 51 as the battery pack 10 that will be first connected to the load at the next startup. It has the following function.

[0031] For example, one main controller may have each function of the controller 50. In this case, the one main controller performs the process of controlling each battery pack.

[0032] The functions of the controller 50 may be distributed among, for example, a battery controller disposed in each battery pack and a main controller that controls them. In this case, the battery controllers and the main controller perform processing in cooperation with each other.

[0033] Each function of the controller 50 may be allocated to, for example, one of the battery controllers arranged in each battery pack, which functions as a main controller that controls the other battery controllers. In this case, the one battery controller having the function as the main controller performs processing to control each battery pack.

[0034] In the following description, as an example, it is assumed that each function of the controller 50 is provided in one main controller.

[0035] The controller 50 includes a storage unit 51, a connection processing unit 54, and a failure detection unit 55.

[0036] The storage unit 51 stores information such as an identification number (number) indicating the battery pack 10 that will be first connected to the load at the next startup. When the connection process for the battery pack 10 at startup is completed, the storage unit 51 updates and stores information such as the identification number indicating the battery pack 10 that will be first connected to the load at the next startup.

[0037] The battery pack that is first connected to the load at startup is specified to be different each time the device is started. For example, one battery pack out of multiple battery packs is specified in order as the battery pack that is first connected to the load at startup. The battery pack that is first connected to the load at startup is different from the battery pack that was first specified at the most recent startup.

[0038] The storage unit 51 may store information such as an identification number indicating the battery pack 10 in which a failure has been detected by the failure detection unit 55. The battery pack 10 in which a failure has been detected is excluded from the battery packs 10 that will be first connected to a load at the next startup until replacement or repair is completed; in other words, the battery pack 10 is not stored in the storage unit 51 as the battery pack 10 that will be first connected to a load at the next startup.

[0039] If no failure is detected in the battery pack 10 that first executed the connection process, the memory unit 51 stores a battery pack 10 different from the battery pack 10 that was first connected to the load at the most recent startup as the battery pack 10 that will be first connected to the load at the next startup.

[0040] In the embodiment, if no fault is detected in the battery pack 10 that first performed the connection process, the memory unit 51 stores in the memory unit 51 the battery pack 10 numbered with the number next to the number of the battery pack 10 that was first connected to the load at the most recent startup as the battery pack 10 that will be first connected to the load at the next startup.

[0041] When a failure is detected in the battery pack 10 that first executed the connection process, the memory unit 51 stores in the memory unit 51 a battery pack 10 other than the battery pack 10 in which the failure was detected, which is different from the battery pack 10 that was first connected to the load at the most recent startup, as the battery pack 10 to be first connected to the load at the next startup.

[0042] At startup, the connection processing unit 54 performs connection processing for the battery pack 10 to be connected to the load first, which is stored in the storage unit 51. At startup, the connection processing unit 54 connects the battery pack 10 to the load first, which is stored in the storage unit 51, to the load first, in other words, before performing connection processing for the other battery packs 10.

[0043] If this is the first connection process at startup, in other words, if precharging is not complete, the connection processing unit 54 performs connection processing with precharging for the battery pack 10 that is to be connected to the load first, as stored in the memory unit 51. The connection processing unit 54 connects the precharge connection member 15 of the battery pack 10 to the battery pack 10 that is to be connected to the load first, performs precharging, and then connects the battery pack 10 to the load. The connection processing unit 54 turns on the negative main connection member 12 and the precharge connection member 15 while keeping the positive main connection member 17 of the battery pack 10 that is to be connected to the load first OFF. The connection processing unit 54 determines that precharging is complete when the voltages at point A1 on the positive side of the precharge connection member 15 and point A2 on the terminal 10a side of the resistor 16 are equal, and when the voltages at points B1 and B2 across the negative main connection member 12 are equal. The connection processing unit 54 determines that pre-charging is complete when the difference between the total voltage on the battery 11 side and the total voltage on the load side remains smaller than the pre-charging completion determination voltage for a determination time. When the connection processing unit 54 determines that pre-charging is complete, it turns off the pre-charge connection member 15 and turns on the positive electrode main connection member 17.

[0044] If no fault is detected in the battery pack 10 that first executed the connection process, the connection processing unit 54 performs the connection process on all battery packs 10 other than the battery pack 10 that first executed the connection process. The connection processing unit 54 turns on the negative electrode main connection member 12 and the positive electrode main connection member 17 of all battery packs 10 other than the battery pack 10 that first connects to the load.

[0045] When a failure is detected in the battery pack 10 that first executed the connection process, the connection processing unit 54 performs connection processing on one of the battery packs 10 other than the battery pack 10 that first executed the connection process. The connection processing unit 54 performs connection processing with pre-charging on one of the battery packs 10 other than the battery pack 10 that is first connected to the load. The connection processing unit 54 turns on the negative main connection member 12 and the pre-charge connection member 15 of one of the battery packs other than the battery pack 10 that is first connected to the load, while keeping the positive main connection member 17 off.

[0046] The fault detection unit 55 detects a fault in the battery pack 10 that first executed the connection process after executing the connection process in the battery pack 10 that is connected to the load first. The fault detection unit 55 determines a fault in the precharge connection member 15 in the battery pack 10 after executing the connection process involving precharge. The fault detection unit 55 determines whether or not there is an abnormality in the precharge in the battery pack 10 after executing the connection process involving precharge. The fault detection unit 55 determines whether or not the precharge in the battery pack 10 was completed normally. For example, if the total voltage on the load side remains below a predetermined value for a predetermined period of time, the fault detection unit 55 determines that the precharge was not completed normally and that there is an abnormality, in other words, that there is a fault.

[0047] 4 is a block diagram showing a computer system according to an embodiment. The controller 50 includes a computer system 1000. The computer system 1000 includes a processor 1001 such as a CPU, a main memory 1002 including a nonvolatile memory such as a read-only memory (ROM) and a volatile memory such as a random access memory (RAM), a storage 1003, and an interface 1004 including an input / output circuit. The functions of the controller 50 described above are stored as a program in the storage 1003. The processor 1001 reads the program from the storage 1003, loads it into the main memory 1002, and executes the above-described processing in accordance with the program. The program may be distributed to the computer system 1000 via a network.

[0048] <Control method> Fig. 5 is a flowchart showing a battery control method according to the embodiment. For example, when the key of a work vehicle is turned on, the battery control system 1 is started. When the battery control system 1 is started, the processing of the flowchart shown in Fig. 5 is started and the control method is executed.

[0049] The controller 50 causes the connection processing unit 54 to transmit a connection command to the battery pack 10 to be connected to the load first, which is stored in the storage unit 51, to execute connection processing (step ST11).

[0050] The controller 50 causes the connection processing unit 54 to turn on the pre-charge connection member 15 of the battery pack 10 specified in the connection command (step ST12). When step ST12 is executed after step ST11, the battery pack 10 specified in the connection command is the battery pack 10 to be connected to the load first. When step ST12 is executed after step ST17, the battery pack 10 specified in the connection command is the battery pack 10 to be connected next. The controller 50 causes the connection processing unit 54 to turn on the negative main connection member 12 and pre-charge connection member 15 while keeping the positive main connection member 17 of the battery pack 10 to be connected first or next turned off. When the negative main connection member 12 and pre-charge connection member 15 of the battery pack 10 to be connected first or next are turned on, the capacitor of the inverter 45 is pre-charged by the pre-charge circuit.

[0051] The controller 50 determines whether the battery pack 10 that has been connected in step ST12 has completed precharging normally (step ST13). More specifically, the controller 50 determines that precharging has completed normally when the connection processing unit 54 determines that the voltages at point A1 on the positive electrode side of the precharge connection member 15 and point A2 on the terminal 10a side of the resistor 16 are equal, and also when the voltages at points B1 and B2 across the negative electrode main connection member 12 are equal, in the battery pack 10 that has been connected in step ST12 by the connection processing unit 54. The controller 50 determines that precharging has completed normally when the difference between the total voltage on the battery 11 side and the total voltage on the load side remains smaller than the precharge completion determination voltage for a determination time. If the controller 50 determines that precharging has completed normally (Yes in step ST13), the controller 50 proceeds to step ST14. If the controller 50 does not determine that the precharge has been completed normally (No in step ST13), the controller 50 proceeds to step ST17.

[0052] When it is determined that the precharge has been completed normally (Yes in step ST13), the controller 50 causes the connection processing unit 54 to turn on the main connection member (step ST14). More specifically, the controller 50 causes the connection processing unit 54 to turn off the precharge connection member 15 of the battery pack 10 that was connected in step ST12, and turn on the positive main connection member 17.

[0053] The controller 50 causes the connection processing unit 54 to execute connection processing for the remaining battery packs (step ST15). More specifically, the controller 50 causes the connection processing unit 54 to turn on the negative electrode main connecting members 12 and positive electrode main connecting members 17 of the battery packs 10 for which connection processing has not been performed in step ST12, in other words, of the remaining battery packs 10.

[0054] The controller 50 stores in the storage unit 51 the battery pack 10 to be first connected to the load at the next startup (step ST16). If no failure is detected in the battery pack 10 that first executed the connection process, the controller 50 stores in the storage unit 51 a battery pack 10 different from the battery pack 10 that was first connected to the load at the most recent startup as the battery pack 10 to be first connected to the load at the next startup. If a failure is detected in the battery pack 10 that first executed the connection process, the controller 50 stores in the storage unit 51 a battery pack 10 other than the battery pack 10 in which the failure was detected, that is different from the battery pack 10 that was first connected to the load at the most recent startup, as the battery pack 10 to be first connected to the load at the next startup.

[0055] If it is not determined that the precharge has been completed normally (No in step ST13), the controller 50 causes the connection processing unit 54 to send a connection command to the next battery pack to execute connection processing (step ST17).

[0056] After step ST17, the controller 50 executes the process of step ST12 again.

[0057] In this way, in step ST12, the positive electrode main connection member 17 remains OFF, and the negative electrode main connection member 12 and the precharge connection member 15 are turned ON to form a precharge circuit. Because the resistor 16 is connected in series to the precharge connection member 15, the current that flows is small. The capacitor of the inverter 45, which is arranged on the load side, is charged (precharged) with a small current. In step ST14, the precharge connection member 15 of the battery pack 10 is turned OFF, and the positive electrode main connection member 17 is turned ON to form a normal circuit.

[0058] The battery pack 10 that is first connected to the load at startup is different every time. In step ST13, the battery pack 10 used for precharging is checked for any malfunction. For this reason, the precharge connection members 15 of the multiple battery packs 10 are periodically checked for any malfunction.

[0059] <Effects> As described above, in the embodiment, the battery pack 10 that is first connected to the load at startup can be different each time. According to the embodiment, it is possible to periodically check whether or not there is a malfunction in the precharge connection members 15 of the plurality of battery packs 10. In the embodiment, it is possible to detect a malfunction in a battery pack after executing the connection process for the battery pack 10 that is first connected to the load at startup that is stored in the memory.

[0060] In the embodiment, the battery packs 10 other than the battery pack 10 in which a failure is detected are stored. According to the embodiment, it is possible to avoid using the battery pack 10 in which a failure is detected for precharging until it is replaced.

[0061] In the embodiment, the battery pack 10 that is to be connected to the load first at the stored startup can be connected to the precharge connection member 15 of the battery pack 10 to perform precharge, and then connected to the load. According to the embodiment, the inrush current flowing into the load at the startup can be suppressed.

[0062] In the embodiment, if no failure is detected in the battery pack 10 used for precharging, connection processing is executed for all battery packs 10 other than the battery pack 10 that executed the precharging. In the embodiment, if a failure is detected in the battery pack 10 used for precharging, connection processing is executed for one of the battery packs 10 other than the battery pack 10 that executed the precharging. According to the embodiment, if the battery pack 10 initially connected to the load is faulty and cannot be precharged, precharge can be executed using another battery pack 10.

[0063] In the embodiment, the battery pack 10 in which a fault is detected can be prevented from being stored as a battery pack to be first connected to a load at the next startup until the battery pack 10 is replaced or repaired. According to the embodiment, the battery pack 10 in which a fault is detected can be prevented from being used for precharging until the battery pack 10 is replaced.

[0064] In the embodiment, a failure of the precharge connection member can be detected as a failure of the battery pack 10.

[0065] In an embodiment, if no fault is detected in the battery pack 10 that first performed the connection process, the battery pack 10 numbered with the number next to the number of the battery pack 10 that was first connected to the load at the most recent startup can be stored as the battery pack 10 that will be first connected to the load at the next startup.

[0066] In the above, there is no limitation on the order in which the precharge connection members 15 and the resistors 16 are connected, but the order in which the precharge connection members 15 and the resistors 16 are connected may be reversed.

[0067] In the above embodiment, the case where the invention is applied to a work vehicle has been described, but the invention is not limited to work vehicles.

[0068] <Modification> A case will be described in which the functions of the controller 50 are distributed between a battery controller disposed in each battery pack and a main controller that controls them. In this case, for example, the storage unit 51 is disposed in the main controller, and the fault detection unit 55 is disposed in the battery controller. The functions of the connection processing unit 54 are distributed between the main controller and the battery controller, and are implemented by their cooperation.

[0069] At startup, the connection processing unit 54 of the main controller transmits a connection request to the battery pack 10 to be connected to the load first, which is stored in the storage unit 51. The connection processing unit 54 of the main controller receives a failure detection result from the battery pack 10 that transmitted the connection request.

[0070] After connecting the battery pack 10 that was first connected to the load, the connection processing unit 54 of the main controller transmits connection requests to the remaining battery packs. More specifically, if the precharge of the battery pack 10 that was first connected to the load is successfully completed, the connection processing unit 54 of the main controller transmits connection requests to the remaining battery packs 10. If the precharge of the battery pack 10 that was first connected to the load is not successfully completed, the connection processing unit 54 of the main controller transmits a connection request to one of the remaining battery packs 10. Subsequent processing is the same as that performed after the battery pack 10 was first connected.

[0071] Such a connection processing unit 54 of the main controller functions as a command transmitting unit.

[0072] The connection processing unit 54 of the battery controller arranged in each battery pack 10 receives a connection request transmitted from the connection processing unit 54 of the main controller to that battery pack 10. The connection processing unit 54 of the battery controller performs connection processing in that battery pack 10 that has received the connection request. The connection processing unit 54 of the battery controller receives a failure detection result from that battery pack 10 that has executed the connection processing.

[0073] In this modification, in step ST11, the connection processing unit 54 of the main controller transmits a connection request to the battery pack 10 stored in the storage unit 51 to be connected to the load first. In step ST12, the connection processing unit 54 of the battery controller turns on the precharge connection member 15 of the battery pack 10 that received the connection request. In step ST13, the fault detection unit 55 of the main controller determines whether or not there is a precharge abnormality in the battery pack 10. In step ST14, the connection processing unit 54 of the battery controller turns on the main connection member of the battery pack 10 that received the connection request. In step ST15, the connection processing unit 54 of the main controller transmits connection requests to the remaining battery packs. In step ST16, the main controller stores in the storage unit 51 the battery pack 10 that will be connected to the load first at the next startup. In step ST17, the connection processing unit 54 of the main controller transmits a connection request to the next battery pack. [Explanation of symbols]

[0074] 1...battery control system, 10...battery pack, 10a...terminal, 10b...terminal, 11...battery, 12...negative main connection member, 15...pre-charge connection member, 16...resistor, 17...positive main connection member (main connection member), 20...power distribution unit (PDU), 20a1...terminal, 20a2...terminal, 20b1...terminal, 20b2...terminal, 20c...terminal, 20d...terminal, 20e...terminal, 20f...terminal, 20g...terminal, 20h...terminal, 20i...terminal, 20j...terminal, 20k...terminal, 20m...terminal, 20n...terminal, 20p...terminal, 42...charging port, 43...on-board charger, 45...inverter, 46...motor, 50...controller, 51...memory unit, 54...connection processing unit, 55...fault detection unit

Claims

1. a plurality of battery packs connected in parallel; a controller for controlling the battery pack; A battery control system comprising: The controller storing the battery pack to be first connected to the load at the next startup in a memory unit; Upon start-up, first connecting the stored battery pack to a load; After executing the stored battery pack connection process, a failure of the battery pack that first executed the connection process is detected; If a failure of the battery pack that first executed the connection process is not detected, the battery pack that is different from the battery pack that was first connected to the load at the most recent startup is stored in the storage unit as the battery pack that will be first connected to the load at the next startup; When a failure is detected in the battery pack that first executed the connection process, the battery pack other than the battery pack in which the failure was detected, which is different from the battery pack that was first connected to the load at the most recent startup, is stored in the storage unit as the battery pack that will be first connected to the load at the next startup. Battery control system.

2. a precharge connection member connected to the battery of the battery pack and switching on and off a precharge circuit using the battery; Equipped with The controller the precharge connection member of the battery pack is connected to the battery pack that is to be connected to the load first, the precharge is performed, and then the battery pack is connected to the load; The battery control system of claim 1 .

3. The controller if no failure is detected in the battery pack that has been first connected, then connection processing is performed on all the battery packs other than the battery pack that has been first connected; when a failure is detected in the battery pack that has been first connected, a connection process is performed on one of the battery packs other than the battery pack that has been first connected; The battery control system of claim 1 .

4. The battery pack in which a failure has been detected is not stored as the battery pack to be first connected to a load at the next startup until replacement or repair is completed. The battery control system of claim 1 .

5. a precharge connection member connected to the battery of the battery pack and switching on and off a precharge circuit using the battery; Equipped with The failure of the battery pack is a failure of the pre-charge connection member. The battery control system of claim 1 .

6. The battery pack is assigned a number for identification, The controller If no failure is detected in the battery pack that first executed the connection process, the battery pack numbered next to the number of the battery pack that was first connected to the load at the most recent startup is stored in the storage unit as the battery pack that will be first connected to the load at the next startup. The battery control system of claim 1 .

7. The battery control system according to any one of claims 1 to 6, A work machine, A work vehicle equipped with:

8. Among the plurality of battery packs connected in parallel, a battery pack to be first connected to the load at the next startup is stored in a memory unit; Upon start-up, first connecting the stored battery pack to a load; After executing the stored battery pack connection process, a failure of the battery pack that first executed the connection process is detected; If a failure of the battery pack that first executed the connection process is not detected, the battery pack that is different from the battery pack that was first connected to the load at the most recent startup is stored in the storage unit as the battery pack that will be first connected to the load at the next startup; When a failure is detected in the battery pack that first executed the connection process, the battery pack other than the battery pack in which the failure was detected, which is different from the battery pack that was first connected to the load at the most recent startup, is stored in the storage unit as the battery pack that will be first connected to the load at the next startup. Control method.

Images