EP4209308A1 - Système comportant une machine-outil et un dispositif d'alimentation électrique, ainsi qu'interface et dispositif d'alimentation électrique - Google Patents

Système comportant une machine-outil et un dispositif d'alimentation électrique, ainsi qu'interface et dispositif d'alimentation électrique Download PDF

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Publication number
EP4209308A1
EP4209308A1 EP22150915.1A EP22150915A EP4209308A1 EP 4209308 A1 EP4209308 A1 EP 4209308A1 EP 22150915 A EP22150915 A EP 22150915A EP 4209308 A1 EP4209308 A1 EP 4209308A1
Authority
EP
European Patent Office
Prior art keywords
contact
partner
supply device
interface
energy supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP22150915.1A
Other languages
German (de)
English (en)
Inventor
Markus Hartmann
Robert Stanger
Markus Holubarsch
Stefan Schmid
Jens Kondratiuk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Priority to EP22150915.1A priority Critical patent/EP4209308A1/fr
Priority to PCT/EP2022/081932 priority patent/WO2023099203A1/fr
Priority to CN202280077883.9A priority patent/CN118302272A/zh
Publication of EP4209308A1 publication Critical patent/EP4209308A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/006—Vibration damping means

Definitions

  • the present invention relates to a system comprising a machine tool and an energy supply device, the energy supply device being provided for supplying the machine tool with electrical energy.
  • the energy supply device can be detachably connected to the machine tool via an interface, the interface comprising at least one female contact partner and one male contact partner.
  • the female contact partner and the male contact partner are in contact with each other at least in a first contact area and in a second contact area.
  • the first contact area can be defined by a first contact normal force while the second contact area can be defined by a second contact normal force, the first contact normal force and the second contact normal force having different orientations.
  • the interface can have an elastic means for reducing a relative movement between the male contact partner and the female contact partner.
  • the invention relates to an interface for the transmission of electrical energy and an energy supply device.
  • So-called cordless machine tools such as cordless screwdrivers, drills, saws, grinders, or the like, can be connected to an energy supply device for energy supply.
  • the energy supply device can, for example, be in the form of a rechargeable battery (“rechargeable battery”) or include one.
  • Accumulators usually have a large number of energy storage cells, also called accumulator cells, with the help of which electrical energy can be absorbed, stored and released again. If the accumulator is connected to a machine tool, the electrical energy stored in the energy storage cells can be supplied to the consumers (eg a brushless electric motor) of the machine tool.
  • the accumulator is connected to a charging device, such as a charging device, so that electrical energy can reach the energy storage cells.
  • the interface between the machine tool and the energy supply device represents a particular technical challenge.
  • the electrical contacts of the machine tool and the electrical contacts of the energy supply device (“contact partners") are connected to one another in such a way that the electrical energy stored in the energy storage cells can be drawn from the accumulator the machine tool can reach.
  • contact normal force is understood to mean the force that acts in a contact area between the contact partners of an interface. In other words, it can be the forces with which the contact partners are pressed against one another in order to form a contact.
  • high contact normal forces are desirable on the one hand in order to obtain good mechanical contact between the power contacts.
  • the contact normal forces should not become too great either, in order to keep undesired mating cycle wear low.
  • the object on which the present invention is based is to overcome the above-described deficiencies and disadvantages of the prior art and to provide an interface and a system of machine tool and power supply device with which the transmission of particularly high discharge currents or large amounts of electrical Allows energy from the power supply device to the machine tool and the service life of the interface can be extended.
  • experts would appreciate it if the interface were still working optimally even after many plugging or clamping cycles and were robust to minor mechanical deviations.
  • a system comprising a machine tool and an energy supply device
  • the energy supply device being designed to supply the machine tool with electrical energy.
  • the energy supply device can be detachably connected to the machine tool via an interface, the interface comprising at least one female contact partner and one male contact partner.
  • the female contact partner and the male contact partner are in a first contact area and in contact with each other in a second contact area.
  • this preferably means that the interface has a first and a second contact area, with the at least one female and the at least one male contact partner being in contact with one another in the contact areas of the interface.
  • the at least one female and the at least one male contact partner can form a pair of power contacts, with electrical current or electrical energy being exchanged via the contact areas between the power contacts. It is particularly preferred within the meaning of the invention that the electrical energy flows from the energy supply device in the direction of the machine tool when the energy supply device and the machine tool are connected to one another via the interface.
  • the transmission of electrical energy from the energy supply device to the machine tool is made possible in particular by active contact between the at least one female and the at least one male contact partner, the active contact in the context of the present invention being provided by at least two contact areas between the at least one female and the at least one male contact partner is established or formed.
  • the contact resistance between the at least one female and the at least one male contact partner can be significantly reduced. This can advantageously lead to larger currents from the energy supply device can be transferred to the machine tool. Consequently, the proposed interface can enable higher discharge currents of the interface, so that the proposed energy supply device is particularly well suited for supplying energy to particularly powerful machine tools.
  • the interface can also have more than two, ie for example three, four, five or more, contact areas between the contact partners.
  • the power contacts are in the form of flat contacts.
  • the interface thus includes flat contacts which, with multiple contacts, i.e. with at least two contact areas, enable electrical energy to be transmitted from the energy supply device to the machine tool.
  • the multiple contacts preferably have differently oriented normal contact forces.
  • the contact normal forces caused by the interface act not only in the clamping or plugging direction of the interface, but in different directions, so that a particularly robust interface can be provided.
  • by providing contact normal forces in different directions it is possible to avoid the contacts “lifting off” at high accelerations, i.e. undesirably detaching from one another.
  • the interface is optimally suited to solving the conflict of objectives between a desired low contact resistance, which is required to transfer high currents and amounts of energy between the power contacts, on the one hand, and a desired low mating cycle wear, on the other hand.
  • the interface can preferably be referred to as a flat contact system with at least one male and at least one female contact partner.
  • the provision of more than one contact area between the at least one female and the at least one male contact partner can ensure that the grade, quality and quantity of the transmission of electrical energy from the energy supply device to the machine tool is less dependent on manufacturing tolerances and relaxation processes.
  • the proposed power supply device is less susceptible and is still able to ensure high discharge currents of the power supply device if manufacturing specifications are not met exactly and minor mechanical deviations occur at the contact partners of the interface or relaxation, especially due to high thermal stress on the elastic Deflection areas leads to a reduction in the contact normal force.
  • a further advantage of the invention is that relative distances between the contact partners can be significantly shortened by providing more than one contact area between power contacts of the interface. Such relative distances between the power contacts can lead to wear and poorer energy transmission from the energy supply device to the machine tool, so that a reduction in the relative movements between the contact partners of the interface can make a significant contribution to keeping the current transmission capacity of the interface at a high level and on to enable the transmission of high discharge currents in this way.
  • the first contact area can be defined by a first normal contact force and the second contact area can be defined by a second normal contact force, the first normal contact force and the second normal contact force having different orientations.
  • the orientations or directions of the two contact normal forces do not coincide, but differ. It is preferred within the meaning of the invention that the orientations and/or directions of the first normal contact force and the second normal contact force do not match but differ by an angular range delta.
  • the wording that "a contact area can be defined by a contact normal force" or is defined preferably means in the context of the invention that the corresponding contact normal force indicates or describes the direction in which the contact partners in the corresponding contact area act or press against one another.
  • a first contact normal force of the first contact area of the interface may be defined by the thighs of the female contact pressing against the blade of the male contact. This slight pressure is caused in particular by the elastic, springy material (e.g. spring steel) of the female contact partner.
  • the first contact normal force may be substantially perpendicular to a virtual axis through the sword of the male contact.
  • a virtual axis can be conceived, preferably running centrally through the sword of the male contact partner, which is essentially perpendicular, ie “normal” to the first contact normal force of the first contact area of the interface. Possible orientations of the contact normal forces of the different contact areas are given, for example, in 4 shown.
  • an insertion direction is also shown, in which the contact partners of the interface can be joined together. It is preferred within the meaning of the invention that a first normal contact force is oriented essentially perpendicularly to this direction of insertion, while a second normal contact force is oriented essentially parallel to the direction of insertion. In this way, the first contact normal force and the second contact normal force preferably substantially perpendicular to each other.
  • the direction of insertion preferably coincides with the virtual axis, which can be put through the sword of the male contact partner.
  • a second contact area for example, stops of the female contact partner against contact surfaces of the male contact partner can come into contact with one another, so that electric current can flow via the contact surfaces.
  • the second contact area can be described by a second normal contact force, which preferably indicates the direction in which the components involved in the contact partners—here stops and contact surfaces—act or press on one another.
  • the second contact normal force may be substantially parallel to the insertion direction. It is therefore preferred within the meaning of the invention that the first normal contact force and the second normal contact force have different orientations. In the embodiment of the invention described above, which is 4 is shown, it is preferred within the meaning of the invention that the first normal contact force and the second normal contact force are oriented substantially perpendicular to one another.
  • stops of the female contact partner and contact surfaces of the male contact partner which together form the second contact area, are particularly well suited for the transmission of high discharge currents from the energy supply device to the machine tool, because there is close contact between the contact partners can be further improved by springing at least one of the contact partners, as explained below.
  • the female contact partner can have stops that interact with contact or support surfaces of the male contact partner in order to create a particularly stable connection between the contact partners. If the female contact partner includes exactly one stop, it is preferred within the meaning of the invention that this one stop is arranged in a plane of symmetry of the female contact partner. If the female contact partner has two stops, it is preferred within the meaning of the invention that these two stops are arranged as far apart as possible in order to ensure improved support for the contact partner.
  • the abutment or support surfaces of the male contact partner can also have ramps in order to facilitate the establishment of the connection between the contact partners and to prevent mechanical damage to the contact partners.
  • the wording "essentially perpendicular" is not an unclear term for the person skilled in the art, because the person skilled in the art knows that this wording is not limited to such contact normal forces are included, which are mathematically exactly perpendicular to each other, but also such contact normal forces that show slight deviations from the mathematically exact normality. Such deviations can be, for example, in a range of +/-10° or +/-10% starting from a right angle (90°).
  • the first contact area is formed by at least one leg of the female contact partner and a sword of the male contact partner.
  • the female contact partner is formed as a receiving clamp, which preferably comprises two legs.
  • the legs can be made of a resilient, elastic material, for example, and can press against the sword of the male contact partner due to the elastic properties of the leg material.
  • This touching of the at least one leg of the female contact partner and the sword of the male contact partner preferably forms the first contact area of the interface.
  • the first contact area is formed by the two thighs of the female contact partner and a middle area of the sword of the male contact partner.
  • the interface has at least one elastic means for reducing a relative movement between the male contact partner and the female contact partner.
  • the elastic means for reducing the relative movement between the contact partners is set up to act on the at least one male contact partner and/or on the at least one female contact partner.
  • the elastic means for reducing the relative movement between the power contacts of the interface acts on the female contact partner.
  • the at least one female contact partner of the interface is spring-loaded, with the at least one female contact partner also preferably being arranged on the energy supply device.
  • the elastic means for reducing the relative movement is preferably also referred to as "elastic means for springing" within the meaning of the invention.
  • the at least one elastic means for reducing a relative movement between the contact partners is set up to generate a prestress, the prestress being oriented essentially perpendicularly to a first contact normal force.
  • the prestressing against the male contact partner in particular against his sword, can be supported by a material with good conductivity properties.
  • this allows a one-piece Contact can be made. Since the components of the female contact partner are preferably only supported on the sword of the male contact partner in the direction of the pretension, the development of relative movements between the at least one female and the at least one male contact partner is surprisingly effectively avoided.
  • the at least one elastic means presses the female contact partner in the direction of the male contact partner, so that there is a particularly close mechanical contact between the female contact partner and the male contact partner.
  • This close mechanical contact has a particularly low transition resistance, which is suitable for the transmission of high discharge currents, with surprisingly low mating cycle wear of the interface being observed at the same time.
  • the provision of the prestress or the provision of the at least one elastic means with which the prestress can be generated provides a particularly tolerance-independent interface for connecting an energy supply device to a machine tool.
  • the interface with the at least one prestressed or spring-loaded power contact in connection with the at least two contact areas between the power contacts has also turned out to be extremely low in relaxation and plug-in wear. Consequently, the proposed interface is particularly robust in relation to high electrical and mechanical loads. It has a long service life and is also suitable for transferring surprisingly high discharge currents or large amounts of electrical charge per unit of time.
  • the prestress can be oriented essentially parallel to the second contact normal force.
  • the elastic means for reducing a relative movement between the contact partners can act on one of the contact partners involved.
  • the elastic means to reduce the relative movement between the contact partners can attack the at least one male contact partner or the at least one female contact partner, the contact partners forming a positive connection between the Form machine tool and the power supply device.
  • the elastic means can act on one of the contact partners, namely either the male or the female contact partner, in order to create a detachable connection between the machine tool and the energy supply device.
  • a significant advantage of the invention is that the particularly large electric currents can be transmitted with the form-fitting connection and that, surprisingly, the relative distances between the contact partners can be kept particularly short, if not reduced to a minimum. As a result, the service life of the interface between the machine tool and the energy supply device can advantageously be significantly extended.
  • the female and male contact partners of the interface can preferably also be referred to as "power contacts" of the interface within the meaning of the invention.
  • a relative distance between the male and female contact partner of the interface can be significantly reduced, so that mechanical friction losses and electrical current conduction losses between the contact partners are reduced to a considerable extent can.
  • a relative distance between the male and the female contact partner of the interface can be reduced to, for example, less than 0.3 mm ⁇ m, preferably less than 0.1 mm and particularly preferably less than 0.05 mm.
  • a first effect relates to the relative movements or the relative distances between the contact partners, which produce the positive connection between the machine tool and the energy supply device.
  • These relative movements or the relative paths can undesirably increase the contact resistance of the interface, this increase being initially independent of the state of wear of the interface.
  • the relative movements between the contact partners can lead to wear and later oxidation, so that the contact resistance of the interface can disadvantageously increase further.
  • the invention makes a significant contribution to the fact that particularly large electrical currents can be transmitted from the energy supply device to the machine tool with the proposed interface.
  • the invention reduces undesired wear and tear on the contact partners and thus makes an equally valuable contribution to increasing the service life of the interface.
  • the elastic means for shortening the relative paths between the power contacts of the interface lead to a mechanical decoupling between the machine tool and the unit made up of male and female contact partners.
  • the elastic means can lead to a mechanical decoupling between the energy supply device and the unit made up of male and female contact partners. Due to the mechanical decoupling, any undesired relative movement between the contact partners is not transmitted, but is advantageously compensated for by the elastic means.
  • the temperature measured in the contact area between the contact partners can be reduced by up to 30 degrees, since the quality of the contact between the contact partners is significantly improved with the invention, ie by providing the elastic means to reduce the relative movement can be improved.
  • the improvement in the transition resistance advantageously leads to an increased current-carrying capacity of the interface, so that machine tools in larger power classes, ie particularly powerful machine tools, can be operated or supplied with electrical energy with the invention.
  • the reduction in the power loss in the contact resistance can advantageously lead to a reduced thermal load on the surrounding components. In particular, components made of thermoplastic material can be effectively protected from damage caused by excessive heat.
  • the contact partner on which the elastic means acts to reduce the relative movement is movably mounted.
  • that contact partner with which the elastic means for reducing the relative movement is operatively connected can be movably mounted.
  • the movably mounted contact partner and/or the movably mounted receiving device is spring-loaded. If there is more than one contact partner per connection partner of the interface, or if the machine tool and/or the energy supply device has more than one receiving device, it may be preferred within the meaning of the invention for the movably mounted contact partner and/or the movably mounted receiving device to be spring-loaded. In this way, the relative movements between the contact partners and the contact resistance can be reduced further and the service life of the interface can be extended considerably.
  • the elastic means for reducing the relative movement acts on a receiving device described later.
  • the receiving device can receive male and/or female power contacts and can also be movably mounted.
  • the receiving device is movably mounted in particular when it is operatively connected to the at least one elastic means for reducing the relative movement between the power contacts or when these elastic means act on the receiving device.
  • the at least one elastic means for reducing the relative movement between the contact partners is set up to act on the at least one male contact partner or on the at least one female contact partner means in the exemplary embodiment of the invention that individual contact partners are arranged in a receiving device are present, preferably that the at least one elastic means for reducing the relative movement between the contact partners is set up to attack the receiving device in which the individual contact partners are contained.
  • the receiving device can form a contact block or a contact means block, which can be mounted movably or spring-loaded with the help of the elastic means. It is preferred within the meaning of the invention that the receiving device comprises the contact partners of a connection partner of the interface, ie machine tool or power supply device.
  • receiving devices are provided, each of which can receive a subset of the contact partners of a connection partner.
  • these multiple receiving devices can also be spring-loaded in that the elastic means for reducing the relative movement acts on these multiple receiving devices.
  • the receiving devices can include the power contacts, ie the female and male contact partners, and/or the communication elements.
  • the elastic means for reducing the relative movement it is preferred to also designate the elastic means for reducing the relative movement as “elastic means for springing”.
  • That contact partner on which the elastic means acts to reduce the relative movement is movably mounted relative to the machine tool or relative to the energy supply device in the connected state.
  • the springing is on the part of the machine tool, i.e. the at least one elastic means acts on the contact partner or the receiving device of the machine tool, the springing designed in this way in the area of the machine tool preferably means that the corresponding contact partner is movably mounted relative to the machine tool in the connected state is.
  • the springing is on the part of the energy supply device, i.e. the at least one elastic means acts on the contact partner or the receiving device of the energy supply device, the springing designed in this way in the area of the energy supply device preferably means that the corresponding contact partner is movably mounted relative to the energy supply device in the connected state is.
  • the wording according to which the elastic means for reducing the relative movement between the contact partners is set up to attack the at least one male contact partner and/or the at least one female contact partner includes, on the one hand, the possibility that the elastic means can be attached to one of the groups of Contact partners attacks, for example on all contact partners that are arranged on the power supply device, or on all contact partners that are arranged on the machine tool.
  • both the machine tool and the energy supply device comprise elastic means for spring-loading their contact partners.
  • the elastic means acts on the at least one male contact partner and on the at least one female contact partner. If one or both groups of contact partners are arranged in a receiving device, the elastic means can act on one of the receiving devices.
  • the elastic means can also act on both receiving devices.
  • An attack on both the contact partners of the machine tool and the contact partners of the energy supply device can be implemented, for example, by using a hard spring for one of the connection partners - energy supply device or machine tool - and a soft (rather) spring for the other connection partner - machine tool or energy supply device ) Feather.
  • the term "hard spring” is in the sense of the invention as a spring with a high To understand spring stiffness, while the term “soft spring” is to be understood in the context of the invention as a spring with a lower spring stiffness.
  • the at least one male contact partner is arranged on the machine tool.
  • the male contacts may include swords that can be inserted into a female contact of the interface or other system component.
  • the male contact partners are in the form of pin-like plugs or swords and the female contact partners of the interface are designed in the form of clamps with elastically deformable legs to accommodate the pin-like plug or swords.
  • the male contact partner can be formed by a protruding area and a stop, with the protruding area being inserted into one of the female contact partners when the interface is in a plugged-in state, in which the power supply device is connected to the machine tool (hence: “connected state”) present.
  • the machine tool and the energy supply device can be independent and separate from one another. This can be the case, for example, when the energy supply device is being charged and is in a charger for charging. It can also be preferred within the meaning of the invention that the at least one male contact partner is arranged on the energy supply device.
  • the energy supply device can preferably include at least one rechargeable battery (“accumulator”), the energy supply device being set up to supply the machine tool with electrical energy. Electrical energy is delivered from the energy supply device to the machine tool in particular in the connected state, in which the machine tool is connected to the energy supply device via the interface.
  • the female and male contact partners engage in one another in the connected state, so that electrical current or electrical energy can flow between the contact partners via a contact area.
  • Tests have shown that by using the at least one elastic means to reduce a relative movement between the contact partners, which acts on one of the contact partners, significantly higher currents can be transmitted than with conventional contact systems, as is the case from the prior art.
  • the invention enables the transmission of currents in a range of more than 50 amperes, preferably more than 70 amperes or particularly preferably more than 100 amperes.
  • the at least one elastic means for reducing the relative movement can preferably comprise at least one elastic element, such as a spring.
  • the elastic element can be designed in the form of a spring and in particular a spiral, bending or helical spring.
  • the elastic element can be designed as a component made of an elastically deformable material.
  • An elastomer is also possible as the material. In this way, a vibration-induced movement of the connection element in several directions, i.e. not only in the direction towards or against the connection element, can be counteracted in a simple manner.
  • the undesired relative movements between the contact partners of the interface can be effectively shortened by using an elastic element.
  • the male contact partner compresses the at least one elastic means when penetrating into the female contact partner, so that the elastic means are brought into a state of tension.
  • the at least one male contact partner can also be spring-loaded.
  • the term "springing" is to be understood in the context of the invention in such a way that the spring-loaded contact partner is operatively connected to the elastic means for reducing the relative movements between the contact partners.
  • the elastic means can act on one of the contact partners in order to reduce the relative movements between the contact partners, as a result of which springing of the corresponding contact partner is advantageously achieved.
  • the at least one elastic means is in a stressed or clamped state in the plugged-in state, in which the energy supply device and the machine tool are connected to one another. It is preferred within the meaning of the invention that the elastic means are also prestressed in the non-installed state, whereby a flow of forces within the energy supply device is closed as a result.
  • the at least one female contact partner can thereby be supported on the energy supply device.
  • the power density of the contact produced can be significantly increased, so that a transmission of electrical currents in a range of more than 50 amps, preferably more than 70 amps or more preferably more than 100 amperes is made possible.
  • the service life of the proposed contact system can be significantly extended, so that the proposed contact system is particularly well suited for power supply devices with long service lives and/or high output currents, because the higher mechanical and/or electrical requirements for an interface can be optimally met by the invention .
  • the at least one female contact partner is arranged on the energy supply device.
  • the at least one female contact partner can preferably be formed by a receiving clamp which is designed to receive the sword of the male contact partner.
  • the female contact partner can have two legs made of an elastic material, the legs being pressed apart when the male contact partner is inserted, so that the male contact partner comes to rest in an interior space of the female contact partner or the receiving clamp.
  • the connected or plugged-in state of the interface is spoken of.
  • the legs of the receiving clip of the female contact in this connected state press against the tongue or protruding portion of the male contact, so that a contact area is created between the contacts .
  • Electrical current or electrical energy is preferably exchanged between the contact partners via this contact area, so that current or electrical energy can flow from the energy supply device in the direction of the machine tool. It can also be preferred within the meaning of the invention that the at least one female contact partner is arranged on the machine tool.
  • the legs of the female contact partner can preferably comprise or be made of spring steel.
  • spring steel In addition to spring steel, other metals, metal alloys or plastics with elastic properties can also be used to produce the female contact partner. Materials with good conductivity, a high yield point and/or low relaxations, such as CuFe2P or CuCrSiTi, can be very particularly preferred.
  • the legs of the female contact partner or the receiving clamp have a minimum spacing in the contact area in order to enable particularly good contact with the male contact partner.
  • the female contact partner preferably has a taper in the contact area with the male contact partner, which is defined by the minimum distance between the thighs of the female contact partner.
  • the legs of the female contact partner have copper or are coated with a copper layer in the contact area or in the area of the taper or in the area of the minimum distance between the legs. Additionally, coatings including but not limited to nickel and/or silver may be used.
  • the current flow or the flow of electrical energy from the energy supply device to the machine tool can be further optimized by the coating material, which is preferably present in the contact area between the male and female contact partners of the proposed interface, so that in particular high currents, such as 50 amps, 70 amps or 100 and more amps can flow through the interface.
  • the female contact partner can comprise a preferably spring-loaded clamp or receiving clamp, while the male contact partner can have an insertion element that can be inserted into the clamp or the receiving clamp.
  • the at least one elastic means for reducing the relative movement comprises at least one elastic element.
  • the male contact partner and the female contact partner can form a unit in the connected state, which is produced by inserting the male contact partner into the female contact partner.
  • the elastic means for reducing the relative movement between the contact partners is operatively connected to the unit made up of female and male contact partners, ie acts on the unit or one of the contact partners of the interface. In the connected state, the unit of male and female contact partners can be pushed in the direction of the machine tool or in the direction of the energy supply device such that the energy supply device can move independently of the unit of male and female contact partners.
  • the vibration-sensitive unit made up of male and female contact partners to be decoupled from the energy supply device, the decoupling of the unit and the energy supply device significantly improves the resilience of the interface, its service life and its robustness to undesired heating.
  • the provision of the at least one elastic means for reducing the relative movement can give the unit of male and female contact partners a freedom of movement, which is referred to as "play" in the context of the invention. Within this movement space, the unit can move without hitting the boundary walls of the movement space.
  • the power supply device can move around it independently of the unit, so that the movement of the power supply device is decoupled from the touch- and vibration-sensitive unit of male and female contact partner is.
  • the at least one elastic means for reducing the relative movement advantageously ensures that the touch-sensitive and vibration-sensitive pairs of male and female contact partners are decoupled from the energy supply device and so on are protected from their movements and vibrations.
  • At least one male and one female contact partner each form a unit, this unit being in a connected state and decoupled from a movement of the energy supply device.
  • this decoupling of the unit made up of male and female contact partners and the energy supply device is brought about in particular by the at least one elastic means for reducing the relative movement, which is made of on one of the contact partners or on the unit attacks at least one male and one female contact partner.
  • the elastic means for reducing the relative movement between the contact partners are set up to act on one of the contact partners or on the unit made up of one male and one female contact partner.
  • the decoupling of the unit from the energy supply device occurs in particular when there is at least one elastic means for reducing the relative distances between the contact partners on the energy supply device.
  • the unit of male and female contact partners can preferably be decoupled from the machine tool.
  • the interface has one to eight, preferably two to six and most preferably four female contact partners.
  • the interface preferably has a corresponding number of male contact partners, so that one male contact partner and one female contact partner can form a contact pair. It is preferred within the meaning of the invention that the male contact partners are arranged on the machine tool, while the female contact partners are arranged on the energy supply device. It can of course also be preferred within the meaning of the invention that the male contact partners are arranged on the energy supply device, while the female contact partners are arranged on the machine tool.
  • the interface comprises a receiving device for receiving at least one female contact partner and/or at least one male contact partner.
  • the receiving device can be set up to receive at least one female contact partner or at least one male contact partner or at least one female and at least one male contact partner.
  • the receiving device can receive at least one female contact partner.
  • the female contact partners it may be preferable for the female contact partners to be arranged individually at the interface or for them to be part of a receiving device, with the individual female contact partners or the receiving device being either part of the machine tool or the energy supply device.
  • the individual female contact partners or the receiving device are/is components of the energy supply device.
  • the receiving device can form a drawer or a cassette in which female contacts and/or male contacts can be accommodated.
  • a contact block can advantageously be provided, so that the female contact partners move together or can be moved together.
  • the receiving device can accommodate one to eight, preferably two to six and most preferably four female contact partners.
  • the contact partners of the interface are spring-loaded individually or that a contact block formed by the contact partners is spring-loaded as a whole. If the contact partners are spring-loaded individually, the contact partners can be individually operatively connected to the elastic means to reduce the relative travel. If the interface on one of the system participants—ie machine tool or energy supply device—for example includes four contact partners, each of these four contact partners can be assigned an elastic means or an elastic element. In this embodiment of the invention, reference is preferably made to “individual spring-loading of the power contacts of the interface”. Alternatively, it can be preferred within the meaning of the invention that an entire contact block, which preferably comprises a plurality of contact partners—female and/or male—is spring-loaded as a whole.
  • Such a contact block is preferably also referred to as a contact center block within the meaning of the invention, it being possible for the contact center block to be formed by a receiving device with power contacts. It is preferred within the meaning of the invention that the contact block or the receiving device is operatively connected to an elastic means or an elastic element. For the purposes of the invention, this preferably means that an elastic means or an elastic element is assigned to the contact block or the receiving device. In this embodiment of the invention, reference is preferably made to a “spring-loaded receiving device” or a “spring-loaded contact means block”. It is preferred within the meaning of the invention that the interface includes communication elements for exchanging data between the machine tool and the energy supply device.
  • the interface can include at least two communication elements, with a first communication element being arranged on the machine tool and a second communication element being arranged on the energy supply device.
  • the communication elements can be set up to establish a communication connection between the machine tool and the energy supply device, it being possible for the communication connection to be wired or wireless.
  • the communication connection between the machine tool and the energy supply device can be wired or “wireless”.
  • wireless communication between the machine tool and the energy supply device can be based on Bluetooth, WLAN, Zigbee, radio, near-field communication or the like.
  • transmitters and receivers can be provided as communication elements.
  • the interface comprises four power contacts and two communication elements.
  • the power contacts and the communication elements can be arranged together in a receiving device, with the common receiving device being assigned an elastic spring-loading means.
  • the power contacts are individually spring-loaded and that the communication elements have their own communication receiving device.
  • Individual spring-loading of the power contacts of the interface can be provided by assigning elastic means to the movably mounted power contacts of the interface.
  • the communication elements are integrated in the receiving device.
  • the receiving device can have at least one communication element for transmitting data between the machine tool and the energy supply device.
  • the communication elements can preferably also be referred to as “communication plugs”, in particular when the communication connection is in the form of a cable.
  • the receiving device has two communication elements, wherein the communication elements can preferably be arranged centrally within the receiving device.
  • two female contact partners can be arranged on one side of the preferably centrally arranged two communication elements and two female contact partners on the other side of the communication elements.
  • the communication elements can be arranged one above the other, for example.
  • the power contacts of the interface ie the female and male contact partners of the interface
  • the power contacts of the interface can be individually spring-loaded, while a separate small receiving device is provided for the communication elements of the interface, which therefore has its own drawer or cassette for the communication elements forms.
  • the receiving device for the communication elements can also be part of the interface between the machine tool and the energy supply device.
  • the at least one elastic means for reducing the relative movement of the receiving device is assigned—preferably as a whole.
  • a receiving device which can receive four female contact partners, for example, can be present with an elastic element connected to the corresponding system component—machine tool or energy supply device.
  • the decoupling then takes place, for example, between the energy supply device and/or the machine tool on the one hand and the receiving device on the other side, so that the female contact partners in the receiving device are decoupled from the movements and/or vibrations of the energy supply device or are protected from them .
  • the decoupling takes place between the receiving device and the machine tool, so that the interface can advantageously also be decoupled from the movements and/or vibrations of the machine tool.
  • the at least one elastic means for reducing the relative movement is assigned to a contact pair consisting of female and male contact partners.
  • each contact pair consisting of female and male contact partners can have its own elastic means for reducing the relative movement, such as an elastic element, and can be decoupled from or protected from the movements and/or vibrations of the energy supply device with the help of the elastic means.
  • elastic means which counteract a relative movement between the energy supply device and the machine tool can.
  • the energy supply device and machine tool are detachably connected to one another via an interface, the interface including male and female contact partners.
  • the female contact partners can be in the form of individual contacts, with each female contact partner being designed to receive a male contact partner or his sword.
  • the female contact partners can form a contact block ("receptacle" or "drawer"), which can be part of the energy supply device or the machine tool. It is particularly preferred within the meaning of the invention that the female contact partners are arranged on the energy supply device. However, it can also be preferred that the female contact partners are arranged on the machine tool.
  • the male contact partners can be designed as individual contacts, with each male contact partner being designed to form a contact pair with a female contact partner with a contact area for the transmission of electrical energy.
  • the male contact partners can form a contact block, which can be part of the energy supply device or the machine tool. It is particularly preferred within the meaning of the invention that the male contact partners are arranged on the machine tool. However, it can also be preferred that the male contact partners are arranged on the energy supply device.
  • the at least one elastic means for reducing the relative movement between the contact partners is preferably set up to prevent or reduce a relative movement between the contact partners of the interface or the machine tool and the energy supply device. The at least one elastic means for reducing the relative movement can act individually on the male and/or female contact partners of the interface.
  • the at least one elastic means can also be preferable for the at least one elastic means to reduce the relative movement to act on the contact blocks or the receiving device for the female contact partners, which are usually formed by two to eight contact partners.
  • the individual female and/or male individual contacts or the contact blocks formed from them can be arranged both on the machine tool and on the energy supply device, with an arrangement of the female contact partners in the area of the energy supply device and an arrangement of the male contact partners in the area of the machine tool being particularly preferred is.
  • the invention in a second aspect, relates to an interface for transmitting electrical energy between a machine tool and an energy supply device.
  • the terms introduced for the system of machine tool and energy supply device, Definitions and technical advantages preferably apply analogously to the interface.
  • the interface preferably has at least one male and at least one female contact partner and is characterized in that the female contact partner and the male contact partner are in contact with one another in at least a first contact area and in a second contact area, the first contact area being definable by a first contact normal force and the second contact area is definable by a second normal contact force, the first normal contact force and the second normal contact force having different orientations.
  • a male and a female contact partner form a unit, the unit being in a connected state and decoupled from a movement of the energy supply device.
  • the invention relates to an energy supply device for use in the proposed system.
  • the energy supply device is preferably an energy supply device with a particularly long service life and/or an energy supply device that is set up to deliver particularly high currents, in particular constant currents of more than 50 amps, preferably more than 70 amps and most preferably of more than 100 amps.
  • the energy supply device can preferably have an accumulator or a preferably rechargeable battery. It is of course also possible within the meaning of the invention for the energy supply device to have two or more rechargeable batteries and/or batteries.
  • the accumulators and/or batteries can have so-called battery packs, which include cylindrical cells, for example. These cylindrical cells may contain, for example, but not limited to, a chemical substance including lithium ions, magnesium ions, and/or sodium ions. However, other cell types, for example with cuboid or cubic cells, can also be used in the context of the present invention.
  • the energy supply device is preferably an energy supply device with a particularly long service life and/or an energy supply device that is set up to deliver particularly high currents, in particular constant currents of more than 50 amps, preferably more than 70 amps and most preferably of more than 100 amps.
  • the particularly long service life can preferably result in the energy supply device surviving a particularly large number of insertion processes or insertion cycles without wearing out.
  • the particularly long service life can mean that the chemical components of the energy supply device are set up to be able to be charged more frequently than previous energy supply devices without significantly aging.
  • a major advantage of the proposed contact system is that such powerful energy supply devices can be connected to it safely and easily.
  • the proposed contact system is able to transmit high currents and can be used throughout the entire service life of the energy supply devices without wearing out.
  • the advantages of new cell and battery technologies can be optimally utilized with the aid of the invention.
  • a contact system of machine tool and energy supply device can be provided that enables efficient use of energy supply devices in battery-operated machine tools, in particular for applications and applications that have very high electrical power requirements and / or very high service life requirements for the system or its interface.
  • the energy supply device comprises at least one energy storage cell (“cell”), the at least one cell having an internal resistance DCR_I of less than 10 milliohms (mOhm).
  • the internal resistance DCR_I of the at least one cell can be less than 8 milliohms and preferably less than 6 milliohms.
  • the internal resistance DCR_I is preferably measured according to the IEC61960 standard.
  • the internal resistance DCR_I represents in particular the resistance of a cell of the energy supply device, with any components or accessories of the cell making no contribution to the internal resistance DCR_I.
  • a low internal resistance DCR_I is advantageous, as this means that unwanted heat that needs to be dissipated does not arise at all.
  • the internal resistance DCR_I is in particular a direct current resistance that can be measured inside a cell of the proposed energy supply device.
  • the internal resistance DCR_I can also have intermediate values, such as 6.02 milliohms; 7.49 milliohms; 8.33 milliohms; 8.65 milliohms or 9.5 milliohms.
  • a power supply device which has particularly good thermal properties in the sense that it can be operated particularly well at low temperatures, with the cooling effort being surprising can be kept low.
  • an energy supply device with a cell internal resistance DCR_I of less than 10 milliohms is particularly well suited to particularly powerful To supply machine tools with electrical energy.
  • Such energy supply devices can thus make a valuable contribution to enabling battery-operated machine tools to be used in areas of application which experts had previously assumed that these areas of application were not accessible to battery-operated machine tools.
  • a possibility can be created for supplying a battery or accumulator-operated machine tool with a power supply device according to the invention with a high output power over a long period of time without damaging the surrounding plastic components or the cell chemistry within the cells of the power supply device.
  • a ratio of a resistance of the at least one cell to a surface area A of the at least one cell is less than 0.2 milliohms/cm 2 , preferably less than 0.1 milliohms/cm 2 and most preferred less than 0.05 milliohms/cm 2 .
  • the surface of the cell can be formed by the outer surface of the cylinder and the top and bottom of the cell.
  • a ratio of a resistance of the at least one cell to a volume V of the at least one cell is less than 0.4 milliohms/cm 3 , preferably less than 0.3 milliohms/cm 3 and most preferably less than 0.2 milliohms/cm 3 .
  • the person skilled in the art knows the formulas for calculating the surface area or the volume of such a geometric body for customary geometric shapes such as cuboids, cubes, spheres or the like.
  • the term “resistance” preferably designates the internal resistance DCR_I, which can preferably be measured according to the IEC61960 standard. This is preferably a DC resistor.
  • the at least one cell has a heating coefficient of less than 1.0 W/(Ah A), preferably less than 0.75 W/(Ah A) and particularly preferably less than 0 .5W/(Ah ⁇ A).
  • the at least one cell may be configured to deliver a current greater than 1,000 amperes/liter in a substantially constant manner.
  • the discharge current is specified in relation to the volume of the at least one cell, with the spatial unit of measurement "liter" (I) being used as the unit for the volume.
  • the cells according to the invention are thus capable of delivering a discharge current of essentially constantly greater than 1,000 A per liter of cell volume.
  • a cell with a volume of 1 liter is capable of delivering a substantially constant discharge current of greater than 1000 A, the at least one cell also having a heating coefficient less than 1.0 W/(Ah ⁇ A).
  • the at least one cell of the proposed energy supply device can have a heating coefficient of less than 0.75 W/(Ah*A), preferably less than 0.5 W/(Ah*A).
  • the unit of the heating coefficient is watts / (ampere-hours ⁇ ampere).
  • the heating coefficient can also have intermediate values, such as 0.56 W/(Ah.A); 0.723 W/(Ah.A) or 0.925 W/(Ah.A).
  • the invention advantageously makes it possible to provide an energy supply device with at least one cell, which has reduced heating and is therefore particularly well suited for supplying machine tools in which high power and high currents, preferably constant currents, are desired for operation.
  • an energy supply device for a machine tool can be provided with the invention, in which the heat that may arise during operation of the machine tool and when electrical energy is supplied to the machine tool can be dissipated in a particularly simple and uncomplicated manner. Tests have shown that with the invention not only existing heat can be dissipated better. Rather, the invention prevents heat from being generated or the amount of heat generated during operation of the machine tool can be significantly reduced with the invention.
  • an energy supply device can be provided which, above all, can optimally supply such machine tools with electrical energy that place high demands on power and discharge current.
  • the invention can be used to provide an energy supply device for particularly powerful machine tools that are used, for example, to carry out heavy drilling or demolition work on construction sites.
  • machine tool is to be understood as a typical piece of equipment that can be used on a construction site, for example a building construction site and/or a civil engineering construction site. It can be, without being limited to, rotary hammers, chisels, core drills, angle grinders or cut-off grinders, cutting devices or the like.
  • auxiliary devices such as those occasionally used on construction sites, such as lamps, radios, vacuum cleaners, measuring devices, construction robots, wheelbarrows, transport devices, feed devices or other auxiliary devices can be "machine tools" within the meaning of the invention.
  • the machine tool can in particular be a mobile machine tool, in which case the proposed energy supply device can also be used in particular in stationary machine tools, such as column-guided drills or circular saws.
  • stationary machine tools such as column-guided drills or circular saws.
  • hand-held power tools that are, in particular, rechargeable or battery-operated.
  • the at least one cell has a temperature-cooling half-life of less than 12 minutes, preferably less than 10 minutes, particularly preferably less than 8 minutes.
  • this preferably means that a temperature of the at least one cell is halved in less than 12, 10 or 8 minutes in the case of free convection.
  • the temperature-cooling half-life is preferably determined when the energy supply device is in an idle state, i.e. when the energy supply device is not in operation, i.e. when it is connected to a machine tool.
  • energy supply devices with temperature-cooling half-times of less than 8 minutes have proven to be particularly suitable for use in powerful machine tools.
  • the temperature-cooling half-time can also have a value of 8.5 minutes, 9 minutes 20 seconds or 11 minutes 47 seconds.
  • the heat generated during operation of the machine tool or when it is being charged remains within the at least one cell for only a short time.
  • the cell can be recharged particularly quickly and is quickly available for renewed use in the machine tool.
  • the thermal load on the component of the energy supply device or the machine tool can be significantly reduced with the proposed energy supply device.
  • the energy supply device can be protected and its service life can be extended.
  • the at least one cell is arranged in a battery pack of the energy supply device.
  • a number of individual cells can preferably be combined in the battery pack and in this way optimally inserted into the energy supply device.
  • 5, 6 or 10 cells can form a battery pack, with integer multiples of these numbers also being possible.
  • the energy supply device can have individual cell strings, which can include, for example, 5, 6 or 10 cells.
  • An energy supply device with, for example, three strings of five cells can include, for example, 15 individual cells.
  • the energy supply device has a capacity of at least 2.2 Ah, preferably at least 2.5 Ah. Tests have shown that the capacitance values mentioned are particularly well suited for the use of high-performance machine tools in the construction industry and correspond particularly well to the local requirements for the availability of electrical energy and the possible service life of the machine tool.
  • the at least one cell of the energy supply device is preferably set up to deliver a discharge current of at least 20 A over at least 10 s.
  • a cell of the energy supply device can be designed to provide a discharge current of at least 20 A, in particular at least 25 A, over at least 10 s.
  • the at least one cell of an energy supply device can be set up to provide a continuous current of at least 20 A, in particular of at least 25 A.
  • peak currents in particular brief peak currents
  • An energy supply device with powerful cooling is therefore particularly advantageous.
  • the at least one cell of the energy supply device can provide at least 50 A over 1 second.
  • the at least one cell of the energy supply device is set up to provide a discharge current of at least 50 A over at least 1 s.
  • Machine tools can often require high performance for a short period of time.
  • a power supply device whose cells are capable of delivering such a peak current and/or such a continuous current can therefore be particularly suitable for powerful machine tools such as those used on construction sites.
  • the at least one cell comprises an electrolyte, the electrolyte preferably being in a liquid state at room temperature.
  • the electrolyte may include, but is not limited to, lithium, sodium, and/or magnesium.
  • the electrolyte can be lithium-based. Alternatively or additionally, it can also be sodium-based.
  • the accumulator is magnesium-based.
  • the electrolyte-based energy supply device can have a nominal voltage of at least 10 V, preferably at least 18 V, in particular at least 28 V, for example 36 V. A nominal voltage in a range from 18 to 22 V, in particular in a range from 21 to 22 V, is very particularly preferred.
  • the at least one cell of the energy supply device can have a voltage of 3.6 V, for example, without being limited to this.
  • the energy supply device is charged, for example, with a charging rate of 1.5 C, preferably 2 C and most preferably 3 C.
  • a charging rate xC can be understood as the current intensity that is required to to fully charge a discharged energy supply device in a fraction of an hour corresponding to the numerical value x of the charging rate x C.
  • a charging rate of 3 C enables the battery to be fully charged within 20 minutes.
  • the at least cell of the energy supply device has a surface area A and a volume V, with a ratio A/V of surface area to volume being greater than six times, preferably eight times and particularly preferably ten times the reciprocal of the third root of volume.
  • the formulation that the surface area A of the at least one cell is greater than, for example , eight times the cube root of the square of the volume V can preferably also be expressed by the formula A >8* V ⁇ ( 2/3 ). In another notation, this relationship can be described by the fact that the ratio A/V of surface area to volume is greater than eight times the reciprocal value of the cube root of the volume.
  • values in the same basic unit must always be used. For example, if a value for the surface area in m 2 is substituted into the above formula, then a value in units for the volume is preferably substituted in m 3 . For example, if a value for surface area in units of cm 2 is substituted into the above formula, a value for volume is preferably substituted in units of cm 3 . For example, if a value for surface area in units of mm 2 is substituted into the above formula, a value for volume is preferably substituted in units of mm 3 .
  • Cell geometries which, for example, satisfy the relation of A >8* V ⁇ ( 2/3 ) advantageously have a particularly favorable ratio between the outer surface of the cell, which is decisive for the cooling effect, and the cell volume.
  • the inventors have recognized that the ratio of surface area to volume of the at least one cell of the energy supply device has an important influence on the heat dissipation of the energy supply device.
  • the improved cooling capability of the proposed energy supply device can advantageously be achieved by increasing the cell surface area with the same volume and low internal resistance of the at least one cell. It is preferred within the meaning of the invention that a low cell temperature with a simultaneously high power output can preferably be made possible when the internal resistance of the cell is reduced. Reducing the internal resistance of the at least one cell can result in less heat being generated.
  • a low cell temperature can be achieved by using cells in which the surface area A of at least one cell within the power supply device is greater than six times, preferably eight times and particularly preferably that Ten times the cube root of the square of the volume V of the at least one cell. In this way, in particular, the heat dissipation to the environment can be improved.
  • energy supply devices whose cells fulfill the stated relationship can be cooled significantly better than previously known energy supply devices with, for example, cylindrical cells.
  • the above relationship can be fulfilled, for example, in that the cells of the proposed energy supply device have a cylindrical basic shape, but additional surface-enlarging elements are arranged on their surface. This can be, for example, ribs, teeth or the like.
  • the cells of the proposed energy supply device can have an essentially cuboid or cubic basic shape.
  • the at least one cell has a cell nucleus, with no point within the cell nucleus being more than 5 mm away from a surface of the energy supply device.
  • heat can be generated in the cell nucleus.
  • this heat can be transported over a relatively short distance to the surface of the cell of the energy supply device.
  • the heat can be optimally dissipated from the surface.
  • Such an energy supply device can therefore have good cooling, in particular comparatively good self-cooling.
  • the time it takes for the limit temperature to be reached can be lengthened and/or the limit temperature can advantageously be completely avoided.
  • a relatively homogeneous temperature distribution can be achieved within the cell nucleus. This can result in a uniform aging of the accumulator. This in turn can increase the lifetime of the power supply device.
  • the at least one cell has a maximum constant current output of greater than 50 amperes, preferably greater than 70 amperes, most preferably greater than 100 amperes.
  • the maximum constant current output is the amount of Current of a cell or power supply device that can be drawn without the cell or power supply device reaching an upper temperature limit. Potential upper temperature limits may range from 60°C or 70°C, but are not limited thereto.
  • the unit of maximum constant current output is ampere.
  • values between 50 and 70 A should also be considered disclosed for the maximum constant current output, ie for example 51; 62.3; 54, 65.55 or 57.06 amps, etc.
  • values between 70 and 100 A should also be considered disclosed, for example 72; 83.3; 96, 78.55, 87.25 or 98.07 amps etc.
  • the energy supply device has a discharge C-rate of greater than 80*t ⁇ (-0.45), where the letter "t" stands for time in seconds.
  • the C rate advantageously enables the charging and discharging currents for energy supply devices to be quantified, the discharge C rate used here in particular enabling the quantification of the discharging currents from energy supply devices.
  • the C rate can be used to specify the maximum allowable charge and discharge currents.
  • These charging and discharging currents preferably depend on the nominal capacity of the energy supply device.
  • the unusually high discharge C rate of 80 ⁇ t ⁇ (-0.45) advantageously means that particularly high discharge currents can be achieved with the proposed energy supply device, which are required for the operation of powerful machine tools in the construction industry.
  • the discharge currents can be in a range of greater than 50 amperes, preferably greater than 70 amperes, or even more preferably greater than 100 amperes.
  • the cell has a cell temperature gradient of less than 10 Kelvin.
  • the cell temperature gradient is preferably a measure of temperature differences within the at least one cell of the proposed energy supply device, it being preferred in the context of the invention that the cell has a temperature distribution that is as uniform as possible, ie that a temperature in an inner region of the cell deviates as little as possible from a Temperature measured in the area of a shell or outer surface of the cell.
  • figure 1 shows a possible embodiment of the system 100 from the machine tool 10 and the energy supply device 20.
  • the machine tool 10 is shown on the left half of the figure and the energy supply device 20 on the right half of the figure.
  • Machine tool 10 has two male contact partners 50, with swords 52 in particular in 1 are shown.
  • the male contact partners 50 are part of an interface 30 , the interface 30 also having female contact partners 40 .
  • in the in 1 illustrated embodiment of the invention are the female contact partners 40 arranged on the energy supply device 20 before.
  • the female contact partners 40 can represent individual contacts or - as in 1 and 2 shown - integrated into a block or a drawer.
  • the block or drawer containing the female contacts 40 is referred to as the receptacle 80 (see Fig 2 ).
  • the interface 30 also includes at least one elastic means 60 for reducing a relative path between the male contact partners 50 and the female contact partners 40.
  • the at least one elastic means 60 can include an elastic element 62, which can be a spring or a spiral spring, for example. However, all other conceivable elastic elements 62 are also possible and conceivable.
  • the contact of the contact partners 40, 50 and the compression of the elastic means 60 to reduce a relative path results in play or a space for movement in which a unit 70 (see 3 ) of male contact partner 50 and female contact partner 40 can be present.
  • a movement or vibration of the energy supply device 20 then results in the unit 70 made up of male contact partner 50 and female contact partner 40 having sufficient play so as not to collide with the boundary walls of the movement space.
  • the close contact between the contact partners 40, 50 means that particularly high currents can flow from the energy supply device 20 to the machine tool.
  • the male contact partners 50 are arranged on the machine tool 10 and the female contact partners 40 on the energy supply device 20
  • a mirrored arrangement may also be possible in which the male contact partners 50 are arranged on the energy supply device 20 and the female contact partners 40 on the machine tool 10.
  • the male contact partners 50 are spring-loaded, ie are connected to an elastic means 60 for reducing a relative path.
  • An insertion direction 34 is shown in the figures, which indicates the direction in which the contact partners 40, 50 of the interface 30 can be inserted or pushed into one another in order to establish an electrically conductive connection.
  • FIG. 2 shows a possible embodiment of the upper side of an energy supply device 20 of a preferred embodiment of the proposed system 100.
  • Four female contact partners 40 which are arranged in a receiving device 80, are shown.
  • the receiving device 80 can also accommodate male contact partners 50 or male contact partners 50 and female contact partners 40 .
  • the receiving device 80 is set up in particular to receive the power or current contacts 40, 50 of the interface 30.
  • the interface 30 can have communication elements 90 which can be arranged, for example, in the area of the receiving device 80 or can be part of the receiving device 80 .
  • the communication elements 90 can be arranged in the middle or centrally in the receiving device 80 and can be provided for the transmission of data between the machine tool 10 and the energy supply device 20 .
  • the communication elements 90 can be set up to establish a communication connection 92 between the machine tool 10 and the energy supply device 20, wherein the communication connection 92 can be wired or wireless. Communication link 92 is in 1 represented schematically by the dashed line between the communication elements 90 .
  • the receiving device 80 can also have communication elements 90 which are preferably arranged in the middle or centrally in the receiving device 80 .
  • the communication elements 90 are preferably provided for the transmission of data between the machine tool 10 and the energy supply device 20 .
  • FIG. 3 shows a possible embodiment of a unit 70 from a female contact partner 40 and a male contact partner 50.
  • an interface 30 which has a female contact partner 40 and a male contact partner 50 .
  • FIG. 3 shows 3 a connected state in which the energy supply device 20 and the machine tool 10 are connected to one another, so that current or electrical energy can flow from the energy supply device 20 in the direction of the machine tool 10 .
  • the blade 52 of the male contact partner 50 is located in the receiving clamp 44 or the legs 44 of the female contact partner 40, with the contact partners 40, 50 forming a contact area 32 with one another, via which the current or the electrical energy from the energy supply device 20 can be transmitted to the machine tool 10.
  • the contact area 32 is formed in particular in the area of a taper 42 of the female contact partner 40, in which the legs 44 or the components of the receiving clamp 44 of the female contact partner 40 assume a minimum distance from one another. As a result, the legs 44 of the female contact partner 40 lie particularly tightly against the sword 52 of the male contact partner 50 .
  • the contact area 32 preferably represents a first contact area 110.
  • a first contact normal force 112 is oriented essentially perpendicular to the insertion direction 34 in the first contact area 110 of the interface 30.
  • FIG. 4 shows a possible embodiment of a unit 70 from a female contact partner 40 and a male contact partner 50.
  • the at least one female contact partner 40 having an elastic means 60 for reducing the relative distance between the contact partners 40, 50 is spring-loaded or prestressed.
  • the sword 52 of the male contact partner 50 is received in an interior space 48 of the female contact partner 40, this interior space 48 being formed by the thighs 44 of the female contact partner 40.
  • the contact between the contact partners 40, 50 consists in particular in a contact area 32 of the interface 30, which in 4 illustrated embodiment of the invention is arranged in the region of the smallest distance between the legs 44 of the female contact partner 40.
  • This contact area 32 is preferably also referred to as first contact area 110 within the meaning of the invention.
  • the first contact normal force 112 is in 4 shown with the arrows pointing at each other.
  • the first contact normal force 112 is preferably essentially perpendicular to a virtual central axis through the sword 52 of the male contact partner 50.
  • the first contact normal force 112 can also be essentially perpendicular to the second contact normal force 122, which is generated by a second contact area 120 of the interface 30 is defined.
  • the first normal contact force 112 is oriented essentially perpendicular to the insertion direction 34 of the interface 30
  • the second normal contact force 122 is oriented essentially parallel to the insertion direction 34 of the interface 30 .
  • the second contact area 120 can be formed by stops 49 on the female contact partner 40 and bearing surfaces 56 on the male contact partner 50 .
  • the second contact area 120 is preferably formed between the contact partners 40 , 50 by contact surfaces 49 , 56 , the female contact partner 40 having a contact surface 49 and the male contact partner 50 having a contact surface 56 .
  • the contact surfaces 49, 56 of the contact partners 40, 50 are aligned substantially perpendicularly with respect to the insertion direction 34.
  • the contact surfaces 49, 56 can be described by a surface normal, the surface normal in the figure 5 illustrated embodiment of the invention is oriented substantially parallel to the insertion direction 34.
  • a second contact normal force 122 which is preferably oriented essentially parallel to the insertion direction 34, acts between the contact surfaces 49, 56 of the contact partners 40, 50.
  • the direction in which the second normal contact force 122 acts is indicated in sub-figure 5b) with a black arrow.
  • the second normal contact force 122 is oriented substantially perpendicular to the first normal contact force 112 .
  • Electric current can be transmitted from one contact partner 40, 50 to the other contact partner 50, 40 both in the first contact area 110 and in the second contact area 120 of the interface 30. Tests have shown that the transmission of electric current is particularly without loss, which is due to the close contact between the one contact partner 40, 50 of the interface 30. The transmission of the electric current can be further improved if at least one of the contact partners 40, 50 of the pair of conductors 70 or of the pair 70 of power contacts 40, 50 is spring-loaded.
  • the female contact partner 40 has two stops 49. It is preferred within the meaning of the invention that these two stops 49 have the greatest possible distance from one another, because this improves the mechanical stability of the interface 30 . In particular, the largest possible distance between the stops 49 of the female contact partner 40 effectively protects against undesired tilting of the interface 30, which could impair the current-carrying capacity of the interface 30.
  • the sword 52 of the male contact partner 50 protrudes into an interior space 48 of the female contact partner 40 but does not strike anywhere there.
  • the pointed or wedge-shaped design of the front region 54 of the sword 52 of the male contact partner 50 is preferably intended to push the contact legs 44 of the female contact partner 40 apart in such a way that the sword 52 of the male contact partner 50 can be pushed into the interior space 48 of the female contact partner 40 as easily as possible can slide in.
  • the contact surface 47 of the female contact partner 40 is preferably set up to cover a relative path between the contact partners 40, 50 of the interface 30
  • figure 5 shows different views of a male contact partner 50 and a female contact partner 40 in the connected state.
  • Subfigure 5a shows a side view of the unit 70 made up of female contact partner 40 and male contact partner 50
  • subfigure 5b shows a plan view of the unit 70 made up of female contact partner 40 and male contact partner 50.
  • the female contact partner 40 can be connected to a current conductor 36 , wherein the current conductor 36 can be connected to energy storage cells of the energy supply device 20 , for example, in order to conduct electrical current or energy in the direction of the interface 30 .
  • the current conductor 36 can be formed, for example, by a braided braid.
  • the male contact partner 50 can preferably be arranged on a machine tool 10 or be part of a machine tool 10 .
  • the male contact partner 50 can be set up in particular to absorb the electric current or energy via his sword 52 if the male contact partner 50 and the female contact partner 40, as in figure 5 shown, connected to each other.
  • the sword 52 of the male contact 50 may then be received in an interior space 48 of the female contact 40 and may be in contact with components of the female contact 40 at two locations 110,120.
  • These contact points 110, 120 are in the sense referred to as first contact area 110 and second contact area 120 of the invention.
  • the first contact area 110 is in the area of a taper 42 of the legs 44 of the female contact partner 40 .
  • first contact normal force 112 is preferably oriented essentially perpendicular to an insertion direction 34 of the contact partners 40, 50 to one another.
  • the direction in which the first contact normal force 112 acts is indicated in sub-figure 5b) with a black arrow.
  • the insertion direction 34 preferably corresponds to the direction in which the swords 52 of the male contact partners 50 can be inserted into the contact arms 44 of the female contact partners 40 in order to connect the contact partners 40, 50 of the interface 30.
  • a pair 70 consisting of a male contact partner 50 and a female contact partner 40 is shown in each case. It is preferred within the meaning of the invention that the interface 30 or its connection partner 10, 20 comprises more than one pair of contacts 70.
  • the machine tool 10 and/or the energy supply device 20 can each have four contact partners 40, 50. These contact partners 40, 50 can also be placed in receiving devices 80 (cf. 1 ) are arranged.
  • a female contact partner 40 spring-loaded in the in figure 5 illustrated embodiment of the invention is a female contact partner 40 spring-loaded.
  • the female contact partner 40 is connected to an elastic spring-loading means 60, which can be a spring 62 or another elastic means 62, for example.
  • the elastic means 60 compressed or compressed for springing.
  • a pretension is exerted on the unit 70 from the contact partners 40, 50, which leads to a decoupling of this unit 70.
  • a single spring-loaded female contact partner 40 is thus illustrated.
  • the female contact partner 40 can also have a stop 49 which can interact with a contact surface 56 of the male contact partner 50 .
  • a stop 49 which can interact with a contact surface 56 of the male contact partner 50 .
  • the stability of the connection between the contact partners 40, 50 can be increased.
  • FIG. 5a shown side view of the contact partner pair 70 two stops 49 of the female contact partner 40 are shown, with a first or upper stop 49 on the top of the female contact partner 40 and a second or lower stop 49 on the underside of the female contact partner 40 is arranged. If the female contact partner 40 has two stops 49, it is preferred within the meaning of the invention that these stops 49 have the greatest possible distance from one another. By the providence of Stops 49 which interact with the contact surface 56 of the male contact partner 50 can effectively prevent the contact partners 40, 50 from tilting in relation to one another.
  • the contact surface 56 can have ramps 59 for guiding the stops 49 in order to guide the contact partners 40, 50 to one another when the connection is made between the contact partners 40, 50 in such a way that no damage occurs to the contact partners 40, 50 occur.
  • figure 6 shows different views of a male contact partner 50 and a female contact partner 40 in the separate state, ie that the contact partners 40, 50 are not connected to one another but are separate from one another.
  • Subfigure 6a shows a side view of the unit 70 made up of female contact partner 40 and male contact partner 50
  • subfigure 6b shows a plan view of the unit 70 made up of female contact partner 40 and male contact partner 50.
  • the male contact partner 50 includes a sword 52 for insertion into the female contact partner 40, and a contact surface 56 with ramps 59.
  • the sword 52 of the male contact partner 50 and the contact legs 44 of the female contact partner 40 preferably form the first contact area 110 within the meaning of the invention, while the stops 49 of the female contact partner 40 and the bearing surfaces 56 of the male contact partner 50 form the second contact region 120.
  • a second normal contact force 122 acts in the second contact region 120 and is preferably oriented essentially parallel to an insertion direction 34 of the interface 30 .
  • the direction in which the second contact normal force 122 acts is in Figure 6b ) indicated with a black arrow.
  • the stops 49 and contact surfaces 56 are oriented essentially perpendicularly to the insertion direction 34 of the interface 30.
  • a surface normal of the contact surfaces 49, 56 can be defined, which is oriented essentially parallel to the insertion direction 34, the surface normal being oriented essentially perpendicular to the contact surfaces 49, 56.
  • a first contact area 110 can be formed by the contact arms 44 of the female contact partner 40 and the sword 52 of the male contact partner 50 .
  • a first normal contact force 122 acts in this first contact region 110 and is preferably oriented essentially perpendicular to an insertion direction 34 of the interface 30 .
  • the direction in which the first contact normal force 112 acts is in Figure 6b ) indicated with a black arrow.
  • the female contact partner 40 is spring-loaded, ie the female contact partner 40 is connected to an elastic means 60, which in 6 is relaxed, ie the spring 62 or the elastic means 62 of the elastic means 60 for springing is in a non-compressed state.
  • the female contact partner 40 shown can be part of an energy supply device 20, wherein the female contact partner 40 can be connected to other components of the energy supply device 20 via a current conductor 36.
  • the current conductor 36 can be in the form of braided braid or can include such a braid.
  • figure 7 shows a detailed view of a preferred embodiment of a female contact partner 40.
  • the in 7 The illustrated embodiment of the female contact partner 40 has two contact arms 44 on each side, into which a sword 52 of a male contact partner 50 (in 7 not shown) can be introduced.
  • the blade 52 of the male contact 50 and the contact arms 44 of the female contact 40 may form a first contact area 110 of the interface 30 .
  • the inside 7 shown female contact partner 40 is connected to an elastic element 60 for springing, so that the female contact partner 50 is preferably spring-loaded.
  • the stops 49 are shown in particular, which are connected to contact surfaces 56 of the male contact partner 50 (in 7 not shown) can form a second contact area 120 of the interface 30 .
  • Electric current can flow through the contact areas 110, 120 of the interface 30 and electric energy can thus be transmitted from one contact partner 40, 50 to the other contact partner 50, 40.
  • the current-carrying areas of the contact areas 110, 120 of the interface 30 are in particular in 8 shown.
  • the stops 49 are spaced as far apart as possible in order to enable the most stable possible mechanical connection between the contact partners 40, 50.
  • the distance is in particular essentially perpendicular to the direction of the first contact normal force 112 and essentially perpendicular to the insertion direction 34 of the interface 30.
  • the largest possible distance between the stops 49 ensures in particular that the interface 30 is particularly well protected against tilting movements.
  • FIG 8 shows a detailed view of a preferred embodiment of a male contact partner 50.
  • the in figure 8 The male contact partner 50 shown has a sword 52 with a front area 54, as well as an upper and a lower contact surface 56.
  • the contact surfaces 56 can be connected to the stops 49 of the female contact partner 40 (in 8 not shown) interact and form a second contact area 120 .
  • the blade 52 of the male contact partner 50 protrudes into an interior space 48 of the female contact partner 40 without coming into contact with a component of the female contact partner 40 are present.
  • the front area 54 of the sword 52 of the male contact partner 50 is preferably tapered or wedge-shaped in order to widen the contact arms 44 of the female contact partner 40 when the contact partners 40, 50 are connected so that the sword 52 can be inserted particularly easily into an interior space 48 of the female contact partner 40 can be introduced.
  • the shaded area of the in figure 8 The illustrated sword 52 of the male contact partner 50 is "clasped" in the connected state of the interface 30 by the contact arms 44 of the female contact partner 40, whereby a first contact area 110 between the contact partners 40, 50 is formed. According to the invention, it is preferred that electric current can flow through both contact areas 110, 120, with these areas through which current flows in figure 8 are shown hatched.
  • the male contact 50 may also have ramps 59 that help bring the stops 49 of the female contact 40 and the abutment surfaces 56 of the male contact 50 together.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
EP22150915.1A 2021-12-01 2022-01-11 Système comportant une machine-outil et un dispositif d'alimentation électrique, ainsi qu'interface et dispositif d'alimentation électrique Withdrawn EP4209308A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP22150915.1A EP4209308A1 (fr) 2022-01-11 2022-01-11 Système comportant une machine-outil et un dispositif d'alimentation électrique, ainsi qu'interface et dispositif d'alimentation électrique
PCT/EP2022/081932 WO2023099203A1 (fr) 2021-12-01 2022-11-15 Système composé d'une machine-outil et d'un dispositif d'alimentation en énergie, interface et dispositif d'alimentation en énergie
CN202280077883.9A CN118302272A (zh) 2021-12-01 2022-11-15 具有动力工具和能量供应装置的系统、以及接口和能量供应装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22150915.1A EP4209308A1 (fr) 2022-01-11 2022-01-11 Système comportant une machine-outil et un dispositif d'alimentation électrique, ainsi qu'interface et dispositif d'alimentation électrique

Publications (1)

Publication Number Publication Date
EP4209308A1 true EP4209308A1 (fr) 2023-07-12

Family

ID=79316676

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Application Number Title Priority Date Filing Date
EP22150915.1A Withdrawn EP4209308A1 (fr) 2021-12-01 2022-01-11 Système comportant une machine-outil et un dispositif d'alimentation électrique, ainsi qu'interface et dispositif d'alimentation électrique

Country Status (2)

Country Link
EP (1) EP4209308A1 (fr)
CN (1) CN118302272A (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007105816A (ja) * 2005-10-12 2007-04-26 Ryobi Ltd バッテリ式電動工具
US20080084181A1 (en) * 2006-10-02 2008-04-10 Snap-On Incorporated Self-aligning terminal block for battery pack
US20140326477A1 (en) * 2013-05-06 2014-11-06 Milwaukee Electric Tool Corporation Power tool including a battery pack isolation system
US20160126533A1 (en) * 2014-05-18 2016-05-05 Black & Decker Inc. Transport System for Convertible Battery Pack
DE102016120329A1 (de) * 2016-10-25 2018-04-26 Festool Gmbh Anschlussvorrichtung eines Elektrogeräts oder eines Energiespeichers
EP3653340A1 (fr) * 2018-11-13 2020-05-20 Hilti Aktiengesellschaft Machine-outil portative doté d'une interface de batterie

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007105816A (ja) * 2005-10-12 2007-04-26 Ryobi Ltd バッテリ式電動工具
US20080084181A1 (en) * 2006-10-02 2008-04-10 Snap-On Incorporated Self-aligning terminal block for battery pack
US20140326477A1 (en) * 2013-05-06 2014-11-06 Milwaukee Electric Tool Corporation Power tool including a battery pack isolation system
US20160126533A1 (en) * 2014-05-18 2016-05-05 Black & Decker Inc. Transport System for Convertible Battery Pack
DE102016120329A1 (de) * 2016-10-25 2018-04-26 Festool Gmbh Anschlussvorrichtung eines Elektrogeräts oder eines Energiespeichers
EP3653340A1 (fr) * 2018-11-13 2020-05-20 Hilti Aktiengesellschaft Machine-outil portative doté d'une interface de batterie

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