JP-7855552-B2 - Electric work equipment and method for starting electric work equipment

JP7855552B2JP 7855552 B2JP7855552 B2JP 7855552B2JP-7855552-B2

Inventors

丹波大樹
伊井常泰
高瀬竣也

Assignees

株式会社クボタ

Dates

Publication Date: 20260508
Application Date: 20230622

Claims (13)

Electrical equipment and, An electrical circuit electrically connected to the aforementioned electrical equipment, A plurality of battery packs, each having an internal relay that opens and closes an internal circuit, the plurality of battery packs being sequentially connected in parallel to the electrical equipment via the electrical circuit, It comprises a control unit and, The aforementioned electrical circuit is Each of the aforementioned plurality of battery packs corresponds to a plurality of external relays, which include a plurality of external relays that open and close a circuit connecting the corresponding battery pack to the electrical equipment, The control unit, The system is configured to allow specifying for each battery pack whether or not a diagnostic process is required for the opening and closing operation of the internal relay of the battery pack. When connecting the battery pack to the electrical equipment, For the battery pack for which a diagnostic process for the opening and closing operation is specified as necessary, the diagnostic process is performed. An electric work machine that omits the diagnostic process for the battery pack in which the diagnostic process for the opening and closing operation is specified as not requiring such a process.
The control unit, Of the plurality of battery packs, the first battery pack, which is the first battery pack connected to the electrical device, is specified to perform the diagnostic process. The electric work machine according to claim 1, wherein the diagnostic process is omitted for the second battery pack, which is the second or later of the plurality of battery packs connected to the electrical equipment.
The control unit, The electric work machine according to claim 1, which diagnoses the switching operation of the internal relay based on the switching instruction state of the internal relay and the change in the output voltage of the battery pack accompanying the switching instruction of the internal relay.
Each of the aforementioned plurality of battery packs is The circuit has a pre-charge circuit in which a pre-charge resistor and a pre-charge relay are connected in series in parallel to the internal relay. The control unit, The system is configured to allow specifying for each battery pack whether or not to perform a pre-charge, which involves closing the pre-charge relay before closing the internal relay. When connecting the battery pack, which is designated to require the aforementioned pre-charging, to the electrical equipment, after performing the pre-charging, a first connection process is performed to close the internal relay of the battery pack. The electric work machine according to claim 1, wherein when connecting the battery pack, which is designated as not requiring the pre-charging procedure, to the electrical equipment, the pre-charging procedure is omitted and the first connection procedure is performed.
Electrical equipment and, An electrical circuit electrically connected to the aforementioned electrical equipment, A plurality of battery packs, each having an internal relay that opens and closes an internal circuit, the plurality of battery packs being sequentially connected in parallel to the electrical equipment via the electrical circuit, It comprises a control unit and, The aforementioned electrical circuit is Each of the aforementioned plurality of battery packs corresponds to a plurality of external relays, which include a plurality of external relays that open and close a circuit connecting the corresponding battery pack to the electrical equipment, Each of the aforementioned plurality of battery packs is The circuit has a pre-charge circuit in which a pre-charge resistor and a pre-charge relay are connected in series in parallel to the internal relay. The control unit, The system is configured to allow specifying for each battery pack whether or not to perform a pre-charge, which involves closing the pre-charge relay before closing the internal relay. When connecting the battery pack, which is designated to require the aforementioned pre-charging, to the electrical equipment, after performing the pre-charging, a first connection process is performed to close the internal relay of the battery pack. An electric work machine that, when connecting the battery pack, which is designated as not requiring the pre-charging procedure, to the electrical equipment, performs the first connection procedure without performing the pre-charging procedure.
Each of the aforementioned plurality of battery packs is As the aforementioned internal relay, The first internal relay is located on the positive terminal side, The second internal relay is located on the negative terminal side, It has, The control unit, In the first connection process, it is configured to allow specifying whether or not to close the first internal relay and the second internal relay simultaneously. The electric work machine according to claim 4 or 5, in which it is specified that the first internal relay and the second internal relay be closed simultaneously, the first connection process is performed in which the first internal relay and the second internal relay are closed simultaneously.
The control unit, Of the multiple battery packs, the first battery pack, which is the first battery pack connected to the electrical device, is designated to perform the pre-charge procedure. The electric work machine according to claim 4 or 5, wherein, among the plurality of battery packs, the second battery pack is the second or later battery pack connected to the electrical equipment, and the pre-charging is specified to be omitted.
The control unit, When connecting the battery pack that performs the pre-charge to the electrical equipment, A first preliminary process that closes the external relay corresponding to the battery pack, A second preliminary process that closes the pre-charge relay of the battery pack, The electric work machine according to claim 7, wherein a third pre-processing step is performed after the first pre-processing step and the second pre-processing step to close the internal relay of the battery pack.
The control unit, The electric work machine according to claim 2, wherein the battery pack corresponding to the external relay with the most cumulative switching counts among the plurality of external relays is set to the first battery pack.
The control unit, The electric work machine according to claim 2, wherein the battery pack set as the first battery pack is sequentially changed each time a process is performed to connect the plurality of battery packs to the electrical equipment.
The device further includes a work apparatus for performing a predetermined task, The electric work machine according to claim 1 or 5, wherein the electrical equipment directly or indirectly drives the work device.
Electrical equipment and, An electrical circuit electrically connected to the aforementioned electrical equipment, A plurality of battery packs, each having an internal relay for opening and closing an internal circuit, the plurality of battery packs being sequentially connected in parallel to the electrical equipment via the electrical circuit, The aforementioned electrical circuit A method for starting an electric work machine, comprising a plurality of external relays corresponding to each of the plurality of battery packs, the plurality of external relays for opening and closing circuits connecting the corresponding battery packs to the electrical equipment, A step of specifying for each battery pack whether or not a diagnostic process is required for the opening and closing operation of the internal relay of the battery pack, The process includes connecting the battery pack to the electrical equipment, In the aforementioned connection step, For the battery pack for which the aforementioned diagnostic process is specified as necessary, the aforementioned diagnostic process is performed. A method for starting an electric work machine, wherein the diagnostic process is omitted for battery packs that are designated as not requiring such a diagnostic process.
Electrical equipment and, An electrical circuit electrically connected to the aforementioned electrical equipment, A plurality of battery packs, each having an internal relay for opening and closing an internal circuit, the plurality of battery packs being sequentially connected in parallel to the electrical equipment via the electrical circuit, The aforementioned electrical circuit Each of the aforementioned plurality of battery packs corresponds to a plurality of external relays, which include a plurality of external relays that open and close a circuit connecting the corresponding battery pack to the electrical equipment, In a method for starting an electric work machine, each of the plurality of battery packs has a pre-charge circuit in which a series connection circuit of a pre-charge resistor and a pre-charge relay is connected in parallel to the internal relay, A step of specifying for each battery pack whether or not to perform a pre-charge, which involves closing the pre-charge relay before closing the internal relay, The process includes connecting the battery pack to the electrical equipment, In the aforementioned connection step, For the battery pack for which the aforementioned pre-charging is specified, after the pre-charging is performed, a first connection process is performed to close the internal relay of the battery pack. For the battery pack for which the pre-charging procedure is not required, a method for starting an electric work machine that omits the pre-charging procedure and performs the first connection procedure.

Description

This invention relates to an electric work machine that operates using power supplied from multiple battery packs. Conventionally, electric work machines that operate using power supplied from multiple battery packs (battery assemblies) have been provided. This type of electric work machine comprises a work device, an electrical device that operates the work device, an electrical circuit electrically connected to the electrical device, and multiple battery packs, each having an internal relay that opens and closes its internal circuit, and connected in parallel to the electrical device via the electrical circuit. This type of electric work machine electrically connects the multiple battery packs to the electrical device by simultaneously opening and closing the internal relays of the multiple battery packs when operating the work device (starting the electrical device) (see, for example, Patent Documents 1 and 2). International Publication No. 2015/167024Japanese Patent Publication No. 2011-188789 Figure 1 is a side view of an electric work machine according to one embodiment of the present invention.Figure 2 is a schematic diagram of the hydraulic and electrical systems of the electric work machine according to the same embodiment.Figure 3 is an electrical system diagram of an electric work machine according to the same embodiment.Figure 4 is a flowchart illustrating the process for diagnosing whether parallel connection is possible for the battery packs of an electric work machine according to the same embodiment.Figure 5 is a processing flow diagram of the parallel connection process of the battery pack of the electric work machine according to the same embodiment.Figure 6 is a table showing the diagnostic conditions and results for each diagnostic process in the diagnosis of the opening and closing operation of the internal relay of the battery pack of the electric work machine according to the same embodiment.Figure 7 is a flowchart illustrating the process for fault diagnosis of an electric work machine according to the same embodiment.Figure 8 is a processing flow diagram of the single connection process for the battery pack of the electric work machine according to the same embodiment.Figure 9 is a processing flow diagram of the charging mode for charging the battery pack of an electric work machine according to the same embodiment. The following description of an electric work machine according to one embodiment of the present invention will be made with reference to the drawings. As shown in Figure 1, the electric work machine 1 is a self-propelled, mobile work machine equipped with a mobile device 10. The traveling device 10 comprises a traveling frame 100 and a traveling mechanism 101. The traveling frame 100 is a structure to which the traveling mechanism 101 is attached. The travel mechanism 101 is provided on the left and right sides of the travel frame 100, respectively. That is, the travel mechanism 101 is arranged in pairs in the left-right width direction, perpendicular to the forward and reverse directions. In this embodiment, the travel mechanism 101 is a crawler-type travel mechanism. Specifically, the travel mechanism 101 comprises an idler 102, a drive wheel 103, a plurality of road wheels 104, an endless annular crawler belt 105, and a travel motor 106. The idler 102 is located at the front of the running frame 100, on the leading side in the forward direction. The drive wheel 103 is located at the rear of the running frame 100, on the leading side in the reverse direction. Multiple road wheels 104 are provided between the idler 102 and the drive wheel 103. The crawler belt 105 is wrapped around the idler 102, the drive wheel 103, and the road wheels 104. The travel motor 106 rotates the drive wheels 103. In this embodiment, a hydraulic motor is used for the travel motor 106. Each of the left and right travel mechanisms 101 rotates the crawler belt 105 by rotating the drive wheels 103. The electric work machine 1 according to this embodiment includes a work device 11 for performing a predetermined task. The electric work machine 1 also includes a turntable 12 fixed to a travel frame 100, a machine body 13 supported by the turntable 12, and a cabin 14 supported by the machine body 13. In this embodiment, the electric work machine 1 comprises a dozer device 11a and a shovel device 11b as the work device 11. The dozer device 11a is mounted in front of the traveling device 10. Specifically, the dozer device 11a comprises a dozer plate 110a, a support arm 111a to which the dozer plate 110a is connected at its tip, the support arm 111a being connected to the traveling frame 100 via a laterally extending shaft and capable of swinging vertically around the shaft, and a hydraulic cylinder 112a for swinging the support arm 111a. The shovel device 11b comprises a boom 110b, an arm 111b, a bucket 112b (a working tool), and hydraulic cylinders 113b, 114b, and 115b. The boom 110b has a base end a