Battery pack for a machining system, machining system and method for manufacturing a battery pack

Abstract

The invention relates to a battery pack (1) for a processing system (100), wherein the battery pack (1) has a cell arrangement (2) and a deflection device (27) through which temperature control fluid (TF) flows, wherein the deflection device (27) is adapted to deflect temperature control fluid (TF) flowing through the deflection device (27) in such a way that an output temperature gradient (AT) of the temperature control fluid (TF) flowing out at the fluid output (29) and an input temperature gradient (ET) of the temperature control fluid (TF) flowing in at the fluid input (28) are oriented in essentially the same direction.

Description

SCOPE OF APPLICATION AND STATE OF THE ART

[0001] The invention relates, in particular with several aspects thereof, to a battery pack for a machining system. Furthermore, the invention relates to such a machining system and to a method for manufacturing such a battery pack. TASK AND SOLUTION

[0002] It is an object of the present invention to provide a battery pack for a machining system, as well as such a machining system and a method for manufacturing such a battery pack, each of which has, in particular, special properties. In particular, the invention aims to counteract undesirable effects of heating the battery pack.

[0003] This problem is solved by the subject matter of the independent patent claims. Preferred embodiments are the subject matter of the dependent patent claims. The wording of all claims is made explicit by reference to the content of this description.

[0004] The invention aspects mentioned above and / or below can be implemented individually or jointly. A battery pack according to one of the invention aspects can, if necessary, also be further developed according to another invention aspect. In particular, the invention aspects can be implemented in the same battery pack.

[0005] Embodiments of the invention – unless expressly specified in a complete manner or otherwise mutually exclusive – can in principle be based on any of the aspects of the invention individually or on a combination of the aspects of the invention. The same applies in particular to expedient specifications.

[0006] A battery pack according to a first aspect of the invention is suitable for use in a machining system. In particular, the battery pack is designed and / or configured for use in the machining system. The battery pack has a cell arrangement comprising at least one solid-state battery cell for storing electrical energy. The at least one solid-state battery cell can, in particular, be substantially plate-shaped. The battery pack has an interior housing. The interior housing is designed to accommodate the cell arrangement. The battery pack has a housing that, in particular, at least partially and / or completely, delimits the interior housing. The housing can at least partially and / or completely surround the interior housing. The cell arrangement includes a preloading device.The preloading device is designed to generate a preload force such that it acts, in particular compressively, on the at least one solid-state battery cell of the cell assembly. The preload force is generated by the preloading device in such a way that, in the event of expansion of the housing relative to the cell assembly, the preload force does not fall below a certain minimum value. Such expansion, as a result of which the preload force does not fall below a minimum value, may be due to thermal expansion of the housing. In particular, the preload force can be generated in such a way that it does not fall below the specified minimum value even if the housing expands more than the at least one solid-state battery cell, particularly as a result of heating.Therefore, the preloading device can be designed to generate the preload force in such a way that it is maintained even if the housing experiences greater thermal expansion than the at least one solid-state battery cell. In this way, the at least one solid-state battery cell can be kept under compression when the battery pack heats up. The heating can be caused by discharging and / or charging the at least one solid-state battery cell. Alternatively or additionally, the heating can be caused by external heat input.

[0007] The battery pack can expediently consist of only one solid-state battery cell or at least two, in particular several, solid-state battery cells.

[0008] At least one solid-state battery cell can be a solid-state accumulator cell.

[0009] The at least one solid-state battery cell has, in particular, two electrodes and an electrolyte, wherein the electrodes and the electrolyte consist of a solid material. In particular, the electrolyte is solid under standard conditions, and more specifically, not liquid and / or gaseous. Polymeric, sulfide, or oxide electrolytes can be used.

[0010] Advantageously, at least one solid-state battery cell can be operated stably at significantly higher temperatures or within a wider temperature range than battery cells of another, particularly conventional, type. Due to such higher temperatures or wider temperature ranges, thermal expansion effects can be greater than in conventional battery packs with conventional battery cells. As a result of such higher temperatures or wider temperature ranges, the pressure that the frame and / or housing is to build up and maintain can be subject to large fluctuations, which can be countered by providing a preloading device.

[0011] In the present context, operating temperatures of at least one solid-state battery cell ranging from -35 °C to 200 °C are conceivable.

[0012] Advantageously, maintaining a vacuum in at least one solid-state battery cell ensures particularly reliable contact between the electrolyte and the electrodes. The preload force can generate and maintain pressure across the cell's frame and / or housing. Specifically, the preload force presses the electrolyte and electrodes against each other, particularly perpendicular to the contact surfaces between the electrolyte and the electrodes.

[0013] By providing the pre-tensioning device, it is advantageous to dispense with at least one pressure sensor, and in particular with any pressure sensor, that is present in conventional battery packs for monitoring the contact pressure of the electrodes on the electrolyte.

[0014] By providing the pre-tensioning device, the battery management system of the battery pack can be implemented much more simply compared to conventional battery packs, or even eliminated entirely.

[0015] In an embodiment of the invention, particularly starting from the first aspect of the invention, the preloading device comprises at least one spring-elastic element designed to generate the preload force. The spring-elastic element is, in particular, elastically deformable in order to generate the preload force in a deformation-dependent manner.

[0016] The spring-elastic element can be usefully employed to compensate for thermal expansion effects.

[0017] Advantageously, the preloading device is designed such that the preload force remains almost constant across typical thermal expansion distances of the at least one solid-state battery cell or the housing, and / or does not deviate from a predetermined range, so that the pressure of the housing on the cells is always at a minimum. In particular, fluctuations in the preload force should remain within a predetermined range, even if the preload force should decrease somewhat due to thermal expansion. Such a decrease can be taken into account, in particular, during the initial pressure and / or preloading of the at least one solid-state battery cell as a result of the manufacturing process.

[0018] In a further embodiment of the invention, particularly starting from the first aspect of the invention, the battery pack has two contact plates that serve to transmit the preload force. A spring-elastic element of the preload device, in particular the aforementioned spring-elastic element, is arranged sandwich-like between the two contact plates. The contact plates can enable a particularly uniform distribution of a preload-dependent pressure on the at least one solid-state battery cell.

[0019] Advantageously, each contact plate may comprise a sheet metal element, particularly a metal one. Alternatively or additionally, each contact plate may comprise a flat polymer element. Each contact plate may be electrically conductive or electrically insulating.

[0020] Advantageously, at least one of the contact plates can be designed separately from the solid-state battery cell in question, in particular as a component of a plate heat exchanger of the battery pack. Alternatively or additionally, at least one of the contact plates can be designed as part of a wall of the solid-state battery cell in question.

[0021] It is advantageous for at least one, and in particular each, of the contact plates to be designed to be flat and / or without internal cooling channels.

[0022] In a further embodiment of the invention, particularly starting from the first aspect of the invention, at least one contact plate of the battery pack, in particular at least one of the contact plates mentioned above, has a crown and / or a structure and / or a profile for uniform pressure distribution on one contact side of the contact plate in question. The contact side of at least one contact plate can be designed to be placed against the at least one solid-state battery cell.

[0023] Advantageously, at least one of the contact plates can have a curvature. The contact plate in question can have a trough-like or a bowl-like shape. The contact plate in question can have a concave and a convex side, arranged opposite each other along a thickness direction of the contact plate. The preloading device can contact the contact plate either on the concave side or on the convex side, in particular over a surface, more specifically over its entire surface.

[0024] Advantageously, the convexity of at least one contact plate can point towards the at least one solid-state battery cell. In particular, a convex side of the convex plate can point towards the solid-state battery cell in question. The convexity can also be used to distribute the pressure on the solid-state battery cell in a desirablely uniform manner.

[0025] In a further embodiment of the invention, particularly starting from the first aspect of the invention, a spring-elastic element of the preloading device, especially the aforementioned spring-elastic element, has or is a wave structure. The spring-elastic element can have an undulating shape. The wave structure can be a corrugated profile, particularly in the form of a corrugated sheet. In particular, the spring-elastic element is designed and arranged such that the preload force is generated along an amplitude direction of the wave structure.

[0026] In a further embodiment of the invention, particularly starting from the first aspect of the invention, a spring-elastic element of the preloading device, in particular the aforementioned spring-elastic element or another spring-elastic element of the preloading device, comprises a tubular body. In particular, the spring-elastic element is arranged such that the preload force is generated along a radial direction of the tubular body.

[0027] In a further embodiment of the invention, particularly starting from the first aspect of the invention, the battery pack has at least one fluid channel through which temperature control fluid can flow. The pre-tensioning device limits this at least one fluid channel, at least partially. At least one, or only one, surface area of ​​the pre-tensioning device, particularly a strip-shaped area, can come into contact with the temperature control fluid flowing through the fluid channel.

[0028] A suitable temperature control fluid can be a gas, particularly air, and / or a liquid, particularly polyalphaolefin (PAO) and / or hydrofluoroethers (HFE) and / or perfluorinated hydrocarbons (PFC). It is conceivable to use different temperature control fluids depending on the situation.

[0029] In a further embodiment of the invention, particularly starting from the first aspect of the invention, the pre-tensioning device limits at least two fluid channels of the battery pack, each at least, and in particular only, partially. Alternatively or additionally, two fluid channels of the battery pack, in particular the aforementioned at least two fluid channels, are permeable to temperature control fluid, either in a parallel connection or in a series connection.

[0030] In a further embodiment of the invention, particularly starting from the first aspect of the invention, the cell arrangement comprises at least two solid-state battery cells. The at least two solid-state battery cells are arranged at a distance from one another along a stacking direction of the cell arrangement, such that the at least two solid-state battery cells flank a cell space within the cell arrangement. The pre-tensioning device is arranged between the two solid-state battery cells flanking the cell space, such that opposing contact sides of the pre-tensioning device along the stacking direction each contact one of these two solid-state battery cells. The pre-tensioning device can extend completely through the cell space along the stacking direction.

[0031] Advantageously, the amplitude direction of the aforementioned wave structure can run parallel to the stacking direction. Alternatively or additionally, the aforementioned at least one fluid channel of the battery pack, in particular all fluid channels of the battery pack, can be designed to allow flow of temperature control fluid essentially perpendicular to the stacking direction and / or to the amplitude direction.

[0032] Advantageously, the thickness direction of at least one of the contact plates mentioned above can run parallel to the stacking direction.

[0033] In a further embodiment of the invention, particularly starting from the first aspect of the invention, the housing has a housing cover which adjoins the interior of the housing, especially at the end face. The housing cover can adjoin the interior of the housing perpendicular to the stacking direction.

[0034] In a further embodiment of the invention, particularly starting from the first aspect of the invention, the housing cover at least partially delimits a fluid distribution chamber of the battery pack. The fluid distribution chamber serves to distribute temperature control fluid to at least one fluid channel of the battery pack, in particular to the at least one fluid channel mentioned above. In particular, the fluid distribution chamber serves to distribute temperature control fluid to at least two fluid channels of the battery pack, in particular to the at least two fluid channels mentioned above. Alternatively or additionally, the housing cover or another housing cover of the housing has a fluid collection chamber through which temperature control fluid flows, wherein the fluid collection chamber is at least partially delimited for collecting temperature control fluid from at least one fluid channel of the battery pack, in particular from the at least one fluid channel mentioned above.In particular, the fluid collector chamber is designed to collect temperature control fluid from at least two fluid channels of the battery pack, especially from the at least two fluid channels mentioned above.

[0035] Advantageously, the fluid distribution chamber and the fluid collector chamber are connected by means of at least one fluid channel of the battery pack, in particular by means of at least two fluid channels of the battery pack, in a fluid-conducting manner.

[0036] In a further embodiment of the invention, particularly starting from the first aspect of the invention, the housing cover has an inlet opening. The inlet opening is designed to allow temperature control fluid to flow through it, in order to supply the temperature control fluid to at least one fluid channel of the battery pack, in particular the at least one fluid channel mentioned above. Alternatively or additionally, the housing cover, or the other housing cover of the housing, has an outlet opening for temperature control fluid to flow through it, in order to discharge temperature control fluid from the at least one fluid channel of the battery pack, in particular from the fluid channel mentioned above.

[0037] In a further embodiment of the invention, particularly starting from the first aspect of the invention, the housing cover and / or the other housing cover of the housing has a deflection device through which temperature control fluid can flow, at least partially, and in particular integrally and / or completely. The deflection device has a fluid inlet for the flow of temperature control fluid into the deflection device and a fluid outlet, which communicates fluid-conductingly with the fluid inlet, for the flow of temperature control fluid out of the deflection device. At least one fluid channel of the battery pack, in particular the at least one fluid channel mentioned above, connects fluid-conductingly to the fluid outlet of the deflection device.The deflection device is designed to redirect the temperature control fluid as it flows through it, such that the outlet temperature gradient of the fluid flowing out at the fluid outlet and the inlet temperature gradient of the fluid flowing in at the fluid inlet are essentially aligned. The deflection device may also be designed to impart a swirl to the temperature control fluid flowing through it.

[0038] The housing may expediently comprise a shell housing. The shell housing may have two shell housing parts, in particular shell housing halves, attached to one another. The housing cover of the housing and / or another housing cover of the housing may be attached to the end face of the shell housing, in particular detachably or permanently.

[0039] Advantageously, the casing components can be designed as identical parts and / or as L-profile parts. The casing and / or at least one of the casing covers can be made of or consist of a polymer material, in particular a thermoplastic one.

[0040] A method according to the invention serves to manufacture a battery pack according to the invention, in particular a battery pack according to at least the first aspect of the invention. The method comprises a step in which the cell arrangement, in particular pre-assembled cell arrangements, is positioned between two housing parts for the housing of the battery pack. Furthermore, the method comprises a step in which the housing parts are joined together such that the interior of the housing, in which the cell arrangement positioned between the housing parts is received, is at least partially enclosed, accompanied by setting the minimum value for the preload force. Finally, the method comprises a step in which the joined housing parts are fastened together such that the set minimum value for the preload force is maintained.

[0041] The housing parts can be expediently joined to one another by a material-bonded connection. This material-bonded connection can be achieved by gluing and / or, in particular, welding without filler metal.

[0042] The housing parts, when joined together and when attached to each other, can expediently surround the interior of the housing in a mantle-like and / or circumferential manner.

[0043] A battery pack according to a second aspect of the invention is suitable for use in a machining system. In particular, the battery pack is designed and / or configured for use in the machining system. The battery pack has a cell arrangement comprising at least one solid-state battery cell for storing electrical energy. The at least one solid-state battery cell can, in particular, be substantially plate-shaped. The battery pack also has a deflection device for the flow of a temperature control fluid. The deflection device has a fluid inlet for the flow of temperature control fluid into the deflection device. Furthermore, the deflection device has a fluid outlet for the flow of temperature control fluid out of the deflection device. The fluid inlet communicates with the fluid outlet via a fluid conductor.The diverting device is designed to redirect the temperature control fluid flowing through it. The diverting device deflects the fluid flowing through it in such a way that the outlet temperature gradient of the fluid flowing out of the fluid outlet and the inlet temperature gradient of the fluid flowing in at the fluid inlet are essentially aligned. As a result of the diverting device redirecting the temperature control fluid as it flows through it, particularly effective heat dissipation from the battery pack can be achieved. "Heat dissipation" can mean "cooling."

[0044] In particular, the outlet temperature gradient and the inlet temperature gradient are orthogonal to a main flow direction of the temperature control fluid flowing through the deflection device. The main flow direction can be defined by a flow velocity maximum of a flow profile of the temperature control fluid flowing through the deflection device.

[0045] By redirecting the temperature control fluid flowing through the deflection device, it is particularly possible to ensure that, after the temperature control fluid has absorbed heat upstream of the deflection device, a particularly large amount of heat can then be absorbed again downstream of the deflection device. In other words, the deflection can make it possible to utilize different, especially relatively cold, flow cross-sectional areas upstream and downstream of the deflection device for absorbing the heat to be dissipated.

[0046] The deflection device can be appropriately adapted to impose a swirl on the temperature control fluid flowing through it.

[0047] The deflection device can suitably enable a low-friction flow without turbulence, with low shear rates, but still good mixing of warm and cold fluid components of the temperature control fluid.

[0048] In an embodiment of the invention, particularly starting from the second aspect of the invention, the deflection device comprises a U-shaped deflection fluid channel through which temperature control fluid flows. The deflection fluid channel can connect a top side of the solid-state battery cell with a bottom side of the solid-state battery cell opposite the top side.

[0049] In a further embodiment of the invention, particularly starting from the second aspect of the invention, the deflection device has at least one channel wall surface section which extends, in particular substantially in a strip and / or band shape, from the fluid inlet to the fluid outlet along a, in particular virtual, U-shaped guide curve of the deflection device. The main flow direction of the temperature control fluid flowing through the deflection device can run substantially parallel to the guide curve. The channel wall surface section partially delimits a deflection fluid channel of the deflection device, in particular the aforementioned deflection fluid channel. The channel wall surface section between the fluid inlet and the fluid outlet has a coil, in particular at least or only partially.The winding is designed in such a way that the temperature control fluid flowing through the deflection fluid channel is deflected as a result of the winding in such a way that the output temperature gradient and the input temperature gradient are essentially oriented in the same direction.

[0050] In this context, the winding may be incomplete. In particular, the winding may be less than 360°. Specifically, the winding may be only about half a turn, especially a turn of 150° to 210°, and more specifically, around 180°.

[0051] In a further embodiment of the invention, particularly starting from the second aspect of the invention, the deflection device comprises at least one flow-guiding element, in particular in the form of a web and / or rib, projecting from a channel wall surface of the deflection device. The flow-guiding element serves to guide the temperature control fluid flowing through the deflection device. The channel wall surface from which the flow-guiding element, in particular in the form of a web and / or rib, projects can define a deflection fluid channel of the deflection device, in particular the aforementioned deflection fluid channel. The flow-guiding element can have a helix, in particular a helical and / or screw-like shape. Advantageously, the helix can be wound by less than 360°. The helix can be wound by only 150° to 210°, and more particularly by only 180°.Such a flow-guiding element can be particularly, but not exclusively, used in combination with round channel cross-sections.

[0052] In a further embodiment of the invention, particularly starting from the second aspect of the invention, the battery pack comprises an interior housing for receiving the cell arrangement and a housing that defines the interior housing. The cell arrangement includes a preloading device. The preloading device is designed to generate a preload force acting on the solid-state battery cell such that, when the housing expands relative to the cell arrangement, the preload force does not fall below a certain minimum value. The preloading device also defines at least a portion of a fluid channel in the battery pack through which temperature control fluid flows.

[0053] In a further embodiment of the invention, particularly starting from the second aspect of the invention, the preloading device has at least one spring-elastic element for generating the preload force.

[0054] In a further embodiment of the invention, particularly starting from at least the second aspect of the invention, a spring-elastic element of the preloading device, in particular the aforementioned spring-elastic element, has or is a wave structure. The wave structure has troughs and crests. The troughs and crests can be arranged alternately and / or taper in opposite directions, in particular along an amplitude direction of the wave structure. The wave structure separates first fluid channels of the battery pack from second fluid channels of the battery pack such that the first fluid channels are defined by the troughs and the second fluid channels by the crests.

[0055] Advantageously, spaces between a respective contact plate and the spring-elastic element attached to this contact plate can be used as cooling channels, in particular as first and / or second fluid channels through which temperature control fluid can flow.

[0056] In a further embodiment of the invention, particularly starting from at least the second aspect of the invention, a spring-elastic element of the preloading device, in particular the aforementioned spring-elastic element or another spring-elastic element of the preloading device, comprises a tubular body. The tubular body, in particular with its inner circumferential surface, defines the at least one fluid channel of the battery pack. In particular, the tubular body has a load-dependent deformable inner cross-section, which inner cross-section in a deformation-free state of the tubular body is either rectangular or elliptical, in particular circular or non-circular.

[0057] In a further embodiment of the invention, particularly starting from at least the second aspect of the invention, the battery pack has two contact plates for transmitting the preload force. The spring-elastic element is arranged sandwich-like between these contact plates. Each contact plate can, in particular alternatively or additionally to the spring-elastic element, partially delimit at least one fluid channel.

[0058] In a further embodiment of the invention, particularly starting from the second aspect of the invention, a housing of the battery pack has a housing cover which adjoins an interior space of the battery pack, particularly at the front.

[0059] In a further embodiment of the invention, particularly starting from the second aspect of the invention, the housing cover at least partially delimits a fluid distribution chamber of the battery pack through which temperature control fluid flows, which fluid distribution chamber is designed to distribute temperature control fluid to at least one fluid channel, in particular to the at least one fluid channel mentioned above. In particular, the fluid distribution chamber is designed to distribute temperature control fluid to at least two fluid channels of the battery pack, in particular to the at least two fluid channels mentioned above.Alternatively or additionally, the housing cover or another housing cover of the housing at least partially limits a fluid collector space of the battery pack through which temperature control fluid can flow, which fluid collector space is designed to collect temperature control fluid from the at least one fluid channel, in particular from at least two fluid channels, of the battery pack.

[0060] In a further embodiment of the invention, particularly starting from the second aspect of the invention, the housing cover has an inlet opening for flowing with temperature control fluid, which is supplied to at least one fluid channel of the battery pack, in particular the at least one fluid channel mentioned above. Alternatively or additionally, the housing cover or another housing cover of the housing has an outlet opening for flowing with temperature control fluid, which is discharged from the at least one fluid channel of the battery pack, in particular the at least one fluid channel mentioned above.

[0061] In a further embodiment of the invention, particularly starting from the second aspect of the invention, the housing cover and / or another housing cover of the housing has the deflection device of the battery pack, particularly mentioned above, at least partially, in particular integrally and / or completely.

[0062] In a further embodiment of the invention, particularly starting from the second aspect of the invention, the battery pack has at least one additional fluid channel through which temperature control fluid can flow. The at least one fluid channel and the at least one additional fluid channel flank the solid-state battery cell. The at least one fluid channel connects fluidically to the fluid outlet of the deflection device, whereas the at least one additional fluid channel connects fluidly to the fluid inlet of the deflection device. The at least one fluid channel and the at least one additional fluid channel communicate fluidly with each other via the deflection device.

[0063] Advantageously, at least one fluid channel extends along the top of at least one solid-state battery cell, whereas at least one further fluid channel extends along the bottom of said solid-state battery cell.

[0064] A machining system according to the invention comprises a battery pack according to the first aspect of the invention and / or according to the second aspect of the invention. The machining system also comprises an electric machining device. The electric machining device has a receiving device for the interchangeable reception of the battery pack. Furthermore, the electric machining device has an electric drive unit that can be supplied with electrical energy from the at least one solid-state battery cell of the received battery pack. The drive unit can serve to supply drive power to a tool assembly that can be mounted on the electric machining device. The tool assembly can be configured to machine a workpiece by separating it. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Further advantages and features of the invention will become apparent from the claims and from the following description of preferred embodiments of the invention, which are illustrated with reference to the drawings. In this context, identical reference numerals refer to identical, similar, or functionally equivalent components.

[0066] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or on their own, without leaving the scope of the present invention. Fig. Figure 1 shows a schematic side view of an embodiment of a machining system according to the invention. Fig. 2 In a roughly schematic sectional view, an embodiment of a battery pack according to the invention for the machining system according to Fig. 1, Fig. 3 in a roughly schematic sectional view a further embodiment of the battery pack according to the invention for the machining system according to Fig. 1, Fig. 4 in a roughly schematic sectional view a further embodiment of the battery pack according to the invention for the machining system according to Fig. 1 with different types of spring-elastic elements, each shown on the left in their deformation-free state and on the right in their installed, i.e. prestressed and / or deformed state, Fig. 5. A further embodiment of the battery pack according to the invention for the machining system is shown in a rough schematic representation. Fig. 1, Fig. 6. A further embodiment of the battery pack according to the invention for the machining system is shown schematically in broad terms. Fig. 1, Fig. 7. A further embodiment of the battery pack according to the invention for the machining system is shown in a rough schematic representation. Fig. 1, Fig. 8. A further embodiment of the battery pack according to the invention for the machining system is shown in a rough schematic representation. Fig. 1, Fig. Figure 9 shows a further embodiment of the battery pack according to the invention for the machining system in a rough schematic perspective exploded view. Fig. 1, Fig. 10 in a roughly schematic sectional view a deflection device for a further embodiment of the battery pack according to the invention for the machining system according to Fig. 1, and Fig. 11 in a roughly schematic sectional view a further embodiment of the battery pack according to the invention for the machining system according to Fig. 1. DETAILED DESCRIPTION OF THE EXECUTION EXAMPLES

[0067] A machining system 100 includes a battery pack 1. The battery pack 1 is designed and / or adapted for use in the machining system 100. The machining system 100 has an electric machining device 110, which is, for example, a chainsaw.

[0068] The electric machining device 110 has a receiving device 111, which serves to interchangeably receive the battery pack 1. The electric machining device 110 also has an electric drive unit 112. The electric drive unit 112 can be supplied with electrical energy from at least one solid-state battery cell 3 of the received battery pack 1. The drive unit 112 serves, for example, to supply a tool assembly of the electric machining device 110 with drive power for a machining operation, in particular for the cutting and machining of a workpiece.

[0069] The battery pack 1 comprises a cell arrangement 2. The cell arrangement 2 has at least one solid-state battery cell 3 for storing electrical energy. For example, the cell arrangement 2 comprises at least two solid-state battery cells 3 for storing electrical energy. The at least two solid-state battery cells 3 can be arranged along a stacking direction S of the cell arrangement 2 at a distance A from each other such that they flank a cell gap 5 of the cell arrangement 2. The cell arrangement 2 can have more than two solid-state battery cells 3, with a cell gap 5 being present between each pair of solid-state battery cells 3 adjacent along the stacking direction S. The cell arrangement 2 can be referred to as a cell stack.

[0070] For example, battery pack 1 has an interior housing 6 within which the cell arrangement 2 is arranged. In this case, battery pack 1 has a housing 7 which defines the interior housing 6 that accommodates the cell arrangement 2.

[0071] For example, the cell arrangement 2 has a preloading device 8. The preloading device 8 is designed to generate a preload force acting on the at least one solid-state battery cell 3. The preload force can be generated by the preloading device 8 in such a way that, even if the housing 7 expands relative to the cell arrangement 2, the preload force does not fall below a certain minimum value. In particular, the cell arrangement 2 can be held under compression along the stacking direction S by means of the preloading device 8, even if the housing 7 expands more than the cell arrangement 2 – for example, due to heating. The preloading device 8 can thus be designed to at least partially compensate for different thermal expansions of the housing 7 and the solid-state battery cell 3.

[0072] For example, the pre-tensioning device 8 is arranged in the cell space 5 in such a sandwich-like manner between the two solid-state battery cells 3 flanking the cell space 5 that the contact sides 9 of the pre-tensioning device 8 opposite each other along the stacking direction S each touch one of these two solid-state battery cells 3. If the cell arrangement 2 has several cell spaces 5, a pre-tensioning device 8 can be arranged in each, in selected, or only a single cell space 5.

[0073] The cell arrangement 2 can be received in the housing interior 6 in such a way that the cell arrangement 2 is supported on both sides along the stacking direction S on the housing 7 which at least partially absorbs the preload force.

[0074] The preloading device 8, for example, has at least one spring-elastic element 10 for generating the preload force. In some embodiments, the preloading device 8 has exactly one such spring-elastic element 10. In other embodiments, the preloading device 8 can have several, in particular identical or different, spring-elastic elements 10.

[0075] For example, the battery pack 1 has two contact plates 11, which are particularly thin relative to the at least one solid-state battery cell 3, for transmitting the preload force. The spring-elastic element 10 of the preloading device 8 can be arranged sandwich-like between the two contact plates 11. The contact plates 11 can be provided by the preloading device 8, in particular wherein each of the contact plates 11, facing away from the spring-elastic element 10 along the stacking direction S, forms and / or has one of the contact sides 9 of the preloading device 8.

[0076] For example, at least one contact plate 11 of the battery pack 1 has a crown for uniform pressure distribution on the respective contact side 9 of this contact plate 11. Alternatively or additionally, at least one contact plate 11 of the battery pack 1 has a textured surface for uniform pressure distribution on the respective contact side 9 of this contact plate 11. Alternatively or additionally, at least one contact plate 11 has a profiled surface for uniform pressure distribution on the respective contact side 9 of this contact plate 11. It is understood that either only one of the contact plates 11, in particular of the preload device 8, can have a crown and / or a textured surface and / or a profiled surface, or both contact plates 11 flanking the spring-elastic element 10.

[0077] The spring-elastic element 10 of the preloading device 8 can, for example, have or be a wave structure 12. The wave structure 12 can have alternating troughs 13 and crests 14 arranged along a width direction B of the battery pack 1. The troughs 13 can taper in the opposite direction to the stacking direction S. The crests 14 can taper in the stacking direction S. An amplitude direction of the wave structure 12 can run parallel to the stacking direction S. For example, the wave structure 12—viewed along the stacking direction S—is essentially planar, in particular extending over a respective contact side 9.

[0078] For example, the spring-elastic element 10 of the prestressing device 8 has a tube body 15, in particular as an alternative or additional feature to the shaft structure 12. The tube body 15 can be longitudinally extended perpendicular to the stacking direction S. For example, the tube body 15 has a rectangular internal cross-section in an unloaded state, in particular without the generation of the prestressing force. Alternatively, the tube body 15 can have an elliptical, in particular circular or non-circular, internal cross-section as long as the tube body 15 is in its unloaded state. This internal cross-section can be compressed during the generation of the prestressing force.

[0079] The battery pack 1, for example, has at least one fluid channel 18, 18A, 18B through which temperature control fluid TF can flow. The fluid channel 18, 18A, 18B can be part of a heat exchanger 17 of the battery pack 1. The heat exchanger 17 can be configured for temperature control, in particular for cooling, of the at least one solid-state battery cell 3. For example, the pre-tensioning device 8 limits the at least one fluid channel 18, 18A, 18B at least partially. The pre-tensioning device 8 can limit the fluid channel 18, 18A, 18B transversely to the stacking direction S at least partially, and in particular only partially. The pre-tensioning device 8 can be part of the heat exchanger 17.

[0080] For example, battery pack 1 has at least two fluid channels 18, 18A, 18B. The at least two fluid channels 18, 18A, 18B can run essentially, and in particular exactly, parallel to each other. The preloading device 8, for example, limits the at least two fluid channels 18, 18A, 18B at least partially, and in particular transversely to the stacking direction S.

[0081] The at least two fluid channels 18, 18A, 18B of the battery pack 1 can be permeated by temperature control fluid TF in a parallel configuration 19. Alternatively, the at least two fluid channels 18, 18A, 18B can be permeated by temperature control fluid TF in a series configuration 20. In principle, it is conceivable that at least two fluid channels 18, 18A, 18B of the battery pack 1 can be permeated by temperature control fluid TF in a parallel configuration 19, whereas at least two other fluid channels 18, 18A, 18B of the battery pack 1 can be permeated by temperature control fluid TF in a series configuration 20.

[0082] The wave structure 12 can separate the first fluid channels 18, 18A of the battery pack 1 from the second fluid channels 18, 18B of the battery pack 1. The first fluid channels 18, 18A and the second fluid channels 18, 18B can be separated from each other by means of the wave structure 12 such that the first fluid channels 18, 18A are defined by the wave troughs 13 and the second fluid channels 18, 18B by the wave crests 14.

[0083] The wave structure 12 can form a meandering course of fluid channels 18, 18A, 18B.

[0084] The pipe body 15 of the pre-tensioning device 8 can, for example, at least partially or completely define the fluid channel 18, 18A, 18B. The internal cross-section of the pipe body 15 can correspond to the internal cross-section of the fluid channel 18, 18A, 18B.

[0085] The spring-elastic element 10 or the heat exchanger 17 with such a spring-elastic element 10 can serve to dissipate excess heat from the solid-state battery cell 3. In particular, the heat exchanger 17 can be used for the active cooling of the solid-state battery cell 3.

[0086] For example, the housing 7 has a housing cover 21 that adjoins the housing interior 6. The housing cover 21 can adjoin the housing interior 6 at its end face. For example, the housing cover 21 adjoins the housing interior 6 perpendicular to the stacking direction S.

[0087] The housing cover 21, for example, at least partially, and in particular substantially completely, delimits a fluid distribution chamber 22 of the battery pack 1 through which temperature control fluid TF flows. The fluid distribution chamber 22 serves, for example, to distribute temperature control fluid TF to the at least one fluid channel 18, 18A, 18B. For example, the fluid distribution chamber 22 is configured to distribute temperature control fluid TF to at least two fluid channels 18, 18A, 18B of the battery pack 1. Alternatively or additionally, the housing cover 21 or another housing cover 23 of the housing 17 can at least partially, and in particular substantially completely, delimit a fluid collection chamber 24 of the battery pack 1. The fluid collection chamber 24 serves, for example, to collect temperature control fluid TF from the at least one fluid channel 18, 18A, 18B. In particular, temperature control fluid TF can be collected from at least two fluid channels 18, 18A, 18B by means of the fluid collector chamber 24.

[0088] The fluid collector chamber 24 and / or the fluid distribution chamber 22 can be permeated by temperature control fluid TF.

[0089] The phrase "essentially completely confined" can take into account locally existing openings for the inlet and / or outlet of temperature control fluid TF from fluid collector chamber 24 and / or fluid distribution chamber 22, or into fluid collector chamber 24 and / or fluid distribution chamber 22.

[0090] For example, the housing cover 21 has an inlet opening 25. The inlet opening 25 can be configured to allow the flow of temperature control fluid TF to the at least one fluid channel 18, 18A, 18B. In particular, the inlet opening 25 can be arranged substantially in the center of the housing cover 21. Alternatively or additionally, the housing cover 21 or another housing cover 23 of the housing 7 can have an outlet opening 26. The outlet opening 26 can be configured to allow the flow of temperature control fluid TF to discharge the temperature control fluid TF from the at least one fluid channel 18, 18A, 18B.

[0091] For example, battery pack 1 has a diverter 27 through which temperature control fluid TF can flow. The diverter 27 has a fluid inlet 28 for the flow of temperature control fluid TF into the diverter 27. The diverter 27 also has a fluid outlet 29 for the flow of temperature control fluid TF out of the diverter 27. The fluid inlet 28 and the fluid outlet 29 communicate with each other via fluid conduction.

[0092] The deflection device 27 is adapted, for example, to deflect the temperature control fluid TF as it flows through the deflection device 27 in such a way that an output temperature gradient AT of the temperature control fluid TF flowing out at the fluid output 29 and an input temperature gradient ET of the temperature control fluid TF flowing in at the fluid input 28 are essentially oriented in the same direction.

[0093] The outlet temperature gradient AT and the inlet temperature gradient ET are oriented orthogonally to a main flow direction of the temperature control fluid TF flowing through the deflection device 27. The main flow direction can be defined by a flow velocity maximum of a flow profile of the temperature control fluid TF flowing through the deflection device 27.

[0094] For example, a volume unit of temperature control fluid TF, in particular conceived as a plug, which moves in the main flow direction when flowing through the deflection device 27, can have a flow cross-sectional area oriented perpendicular to the main flow direction, wherein the flow cross-sectional area undergoes a rotation, in particular by about 180°, when the volume unit moves in the main flow direction towards the fluid outlet 29.

[0095] For example, the main flow direction of the temperature control fluid TF at the fluid outlet 29 is different, in particular substantially or exactly opposite, to the main flow direction of the temperature control fluid TF at the fluid inlet 28.

[0096] For example, the housing cover 21 has at least a partial, in particular integral and / or complete, deflection device 27 through which temperature control fluid TF flows. Alternatively or additionally, the other housing cover 23 of the housing 7 can have the deflection device 27 or a further deflection device 27.

[0097] For example, at least one fluid channel 18, 18A, 18B is connected to the fluid outlet 29 of the deflection device 27 in a fluid-conducting manner. Another, in particular a second, fluid channel 18, 18A, 18B can be connected to the fluid inlet 28 in a fluid-conducting manner.

[0098] The deflection device 27, for example, has a U-shaped deflection fluid channel 34 through which temperature control fluid TF can flow, particularly along the main flow direction. The deflection fluid channel 34 can extend longitudinally in a U-shape along the main flow direction.

[0099] The deflection device 27 has, for example, at least one, and in particular several, channel wall surface sections 36. Such a channel wall surface section 36 is, for example, essentially strip-shaped and / or band-shaped. The channel wall surface section 36 extends, for example, from the fluid inlet 28 to the fluid outlet 29 along a U-shaped guide curve 35 of the deflection device 27, in particular a virtual or imaginary one. The channel wall surface section 36 partially delimits the deflection fluid channel 34, in particular orthogonally to the main flow direction of the temperature control fluid TF flowing through the deflection device 27. The temperature control fluid TF can flow along the channel wall surface section 36 and thereby be deflected. There can be four channel wall surface sections 36, which define a rectangular cross-section, in particular a square cross-section, of the deflection fluid channel 34.

[0100] The channel wall section 36 can be designed in the manner of a Möbius strip section. The deflection device 27 can expediently be described as a "Möbius strip mixer" for the 180° deflection of the temperature control fluid TF.

[0101] The channel wall section 36, for example, has a coil between the fluid inlet 28 and the fluid outlet 29, specifically around the guide curve 35. The coil is designed such that the temperature control fluid TF flowing through the deflecting fluid channel 34 is deflected by the coil in such a way that the outlet temperature gradient AT and the inlet temperature gradient ET are essentially oriented in the same direction. In particular, the temperature gradient of a volume of temperature control fluid TF moving through the deflecting device 27 has a substantially constant angle to the channel wall section 36.

[0102] The turn of the channel wall surface section 36 can be an incomplete turn, in particular it can be less than 360°. The turn is, for example, only approximately half a turn, which can be between 150° and 210°, in particular approximately or exactly 180°.

[0103] The deflection device 27 can, for example, have at least one flow-guiding element 38 for guiding the temperature control fluid TF flowing through the deflection device 27. The at least one flow-guiding element 38 projects from a channel wall surface 37 of the deflection device 27 that defines the deflection fluid channel 34. Exactly one such flow-guiding element 38 or at least two such flow-guiding elements 38 can be provided. Such a flow-guiding element 38 can be web-shaped and / or rib-shaped. A web-shaped flow-guiding element 38 can continuously connect channel wall surface sections 36 that are opposite each other perpendicular to the main flow direction. In contrast, a rib-shaped flow-guiding element 38 can, in particular, only be integrally formed on a channel wall surface section 36 and / or terminate freely facing away from a channel wall surface section 36.

[0104] The flow-guiding element 38 can have a helix that is wound by 150° to 210°, in particular by approximately or exactly 180°. The helix can run inside the deflecting fluid channel 34. In particular, the helix can extend helically through the interior of the deflecting fluid channel 34, more especially in the main flow direction.

[0105] For example, battery pack 1 has at least one further fluid channel 18*, 18A*, 18B* through which temperature control fluid TF flows. The at least one fluid channel 18, 18A, 18B and the at least one further fluid channel 18*, 18A*, 18B* flank the solid-state battery cell 3. The at least one further fluid channel 18*, 18A*, 18B* may be connected to a further heat exchanger 17* of battery pack 1. The at least one fluid channel 18, 18A, 18B* connects, for example, to the fluid outlet 29 of the deflection device 27, whereas the at least one further fluid channel 18*, 18A*, 18B* connects to the fluid inlet 28 of the deflection device 27. In this process, at least one fluid channel 18, 18A, 18B and at least one further fluid channel 18*, 18A*, 18B* can communicate with each other fluid-conductingly by means of the deflection device 27.

[0106] The heat exchanger 17 and the further heat exchanger 17* can be of the same design.

[0107] The top and bottom surfaces of successive wave structures 12 in the stacking direction S can be connected by a channel rotation of the deflecting device 27, in particular due to the winding and / or the helix, such that a warm side of the temperature control fluid TF arrives at a cold side after the 180° deflection. The fluid channels 18, 18A, 18B, 18*, 18A*, 18B* can be interconnected such that the temperature control fluid TF flows essentially from the inside to the outside of the entire battery pack 1.

[0108] For example, the battery pack 1 is manufactured according to a method. This method has a step in which the cell arrangement 2, which is pre-assembled, in particular without preload and / or loosely, is positioned between two housing parts 32 for the housing 7. The method has a further step in which the housing parts 32 are joined together in such a way that the interior of the housing 6 is at least partially enclosed by accommodating the cell arrangement 2 positioned between the housing parts 32, and in which, concurrently with the joining of the housing parts 32, the minimum value for the preload force is set and / or defined. Furthermore, the method has a step in which the joined housing parts 32 are fastened together in such a way that the previously set or defined minimum value for the preload force is maintained.

[0109] During the manufacturing process of battery pack 1, a force measurement can be taken to adjust the preload force, in particular only before and / or only during the fastening of the housing parts 32 to one another. A pressure sensor, especially a permanent one, does not need to be installed in battery pack 1 itself.

[0110] The housing parts 32 can be fastened to one another by joining them materially. This material-bonded joining can be achieved, for example, by gluing and / or by welding, particularly without filler metal. It is understood that other joining methods and / or combinations thereof may be suitable for fastening.

[0111] The housing parts 32, in their assembled state, particularly in a fused state, can surround the interior of the housing 6 like a mantle and / or completely. The housing parts 32 can be designed as mantle housing parts and / or, in their fused state, form a mantle housing 32 of the housing 7. The mantle housing 33 can form a rectangular profile body.

[0112] The housing cover 21 of the housing 7 and / or the other housing cover 23 of the housing 7 can be attached to the outer housing 33, for example, at the end face. The housing parts 32 can be designed as identical parts and / or as L-profile parts 31. Two L-profile parts 31 can define the rectangular profile body of the outer housing 33, in particular each exactly half.

[0113] The casing 33 and / or at least one of the casing covers 21, 23 may have a polymer material or be made of a polymer material.

[0114] The temperature control fluid TF can be air and / or a low-viscosity polyalphaolefin (PAO).

[0115] When using a liquid as a temperature control fluid TF, it may be conceivable to pump the liquid out of the battery pack 1 after electrically charging the battery pack 1 or after operating an electric processing device 1 based on energy from the battery pack 1.

[0116] It is conceivable to use air as the temperature control fluid TF for the operation of the electric machining device 110 with the battery pack 1 installed, whereas a liquid, in particular PAO, is used as the temperature control fluid TF when charging the battery pack 1 outside the electric machining device 110. An electric charger for charging the battery pack 1 can be provided with a tank for the liquid, wherein the charger has a pump designed to pump liquid through the battery pack 1 during charging and which, at the end of charging, pumps the liquid out of the charged battery pack 1 again, so that when the charged battery pack 1 is subsequently used in the electric machining device 110, air can again be used as the temperature control fluid TF.

[0117] The electric machining unit 110, the charger and / or the battery pack 1 of the machining system 100 may include the pump for conveying temperature control fluid TF through the battery pack 1. The charger and / or the electric machining unit 110 may, for example, include a shell and tube heat exchanger that can dissipate heat extracted from the battery pack 1 to an external environment.

Claims

[1] Battery pack (1) for a processing system (100), wherein the battery pack (1) comprises: - a cell arrangement (2) comprising at least one solid-state electric battery cell (3) for storing electrical energy, and - a deflection device (27) through which temperature control fluid (TF) can flow, which has a fluid inlet (28) for the flow of temperature control fluid (TF) into the deflection device (27) and a fluid outlet (29) which communicates fluid-conductingly with the fluid inlet (28) for the flow of temperature control fluid (TF) out of the deflection device (27), - wherein the deflection device (27) is adapted to deflect the temperature control fluid (TF) flowing through the deflection device (27) such that an output temperature gradient (AT) of the temperature control fluid (TF) flowing out at the fluid outlet (29) and an input temperature gradient (ET) of the temperature control fluid (TF) flowing in at the fluid inlet (28) are oriented in essentially the same direction. [2] Battery pack (1) according to the preceding claim, - wherein the deflection device (27) has a U-shaped deflection fluid channel (34) through which temperature control fluid (TF) flows. [3] Battery pack (1) according to any of the preceding claims, - wherein the deflection device (27) has at least one channel wall surface section (36) extending longitudinally from the fluid inlet (28) to the fluid outlet (29) along a U-shaped guide curve (35) of the deflection device (27), in particular a virtual one, and partially defining a deflection fluid channel (34) of the deflection device (27), - wherein the channel wall surface section (36) between the fluid inlet (28) and the fluid outlet (29) has a coil which is designed such that the temperature control fluid (TF) flowing through the deflecting fluid channel (34) is deflected as a result of the coil in such a way that the outlet temperature gradient (AT) and the inlet temperature gradient (ET) are oriented in essentially the same direction. [4] Battery pack (1) according to any one of the preceding claims, - wherein the deflection device (27) has at least one, in particular rib-shaped and / or rib-shaped, flow-guiding element (38) projecting from a channel wall surface (37) of the deflection device (27) which defines a deflection fluid channel (34) of the deflection device (27) for guiding the temperature control fluids (TF) flowing through the deflection device (27). [5] Battery pack (1) according to any one of the preceding claims, - wherein the battery pack (1) has an interior housing (6) for receiving the cell arrangement (2) and a housing (7) delimiting the interior housing (6), - wherein the cell arrangement (2) has a preloading device (8), wherein the preloading device (8) is configured to generate a preload force acting on the solid-state battery cell (3) such that, when the housing (7) expands relative to the cell arrangement (2), the preload force does not fall below a certain minimum value, - wherein the pre-tensioning device (8) at least partially limits one fluid channel (18, 18A, 18B) of the battery pack (1). [6] Battery pack (1) according to the preceding claim, - wherein the preloading device (8) has at least one spring-elastic element (10) for generating the preload force. [7] Battery pack (1) according to one of the two preceding claims, - wherein a spring-elastic element (10) of the pre-tensioning device (8) has or is a wave structure (12) with wave troughs (13) and wave crests (14), in particular wherein the wave troughs (13) and the wave crests (14) are arranged alternately and / or taper in opposite directions, - wherein the wave structure (12) separates first fluid channels (18, 18A) of the battery pack (1) from second fluid channels (18, 18B) of the battery pack (1) such that the first fluid channels (18, 18A) are defined by the wave troughs (13) and the second fluid channels (18, 18B) by the wave crests (14). [8] Battery pack (1) according to any one of the three preceding claims, - wherein a spring-elastic element (10) of the pre-tensioning device (8) has a tube body (15), - wherein the pipe body (15) delimits the at least one fluid channel (18, 18A, 18B), - in particular wherein the pipe body (15) has a load-dependent deformable inner cross-section, which inner cross-section in a deformation-free state of the pipe body (15) is either rectangular or elliptical, in particular circular or non-circular. [9] Battery pack (1) according to any one of the four preceding claims, - wherein the battery pack (1) has two contact plates (11) for transmitting the preload force, - wherein the spring-elastic element (10) is arranged sandwich-like between the two contact plates (11). [10] Battery pack (1) according to any of the preceding claims, - wherein a housing (7) of the battery pack (1) has a housing cover (21) which adjoins a housing interior (6) of the battery pack (1), in particular at the front. [11] Battery pack (1) according to the preceding claim, - wherein the housing cover (21) at least partially defines a fluid distribution chamber (22) through which temperature control fluid (TF) flows for the distribution of temperature control fluid (TF) to at least one fluid channel (18, 18A, 18B), in particular to at least two fluid channels (18, 18A, 18B), of the battery pack (1), and / or - wherein the housing cover (21) or another housing cover (23) of the housing (7) at least partially delimits a fluid collector chamber (24) through which temperature control fluid (TF) flows for collecting temperature control fluid (TF) from the at least one fluid channel (18, 18A, 18B), in particular from at least two fluid channels (18, 18A, 18B), of the battery pack (1). [12] Battery pack (1) according to one of the two preceding claims, - wherein the housing cover (21) has an inlet opening (25) for the flow of temperature control fluid (TF) to at least one fluid channel (18, 18A, 18B) of the battery pack (1), and / or - wherein the housing cover (21) or another housing cover (23) of the housing (7) has an outlet opening (26) for flowing through with temperature control fluid (TF) to be discharged from the at least one fluid channel (18, 18a, 18B) of the battery pack (1). [13] Battery pack (1) according to any one of the three preceding claims, - wherein the housing cover (21) and / or another housing cover (23) of the housing has the deflecting device (27) at least partially, in particular integrally and / or completely. [14] Battery pack (1) according to any of the preceding claims, - wherein the battery pack (1) has at least one further fluid channel (18*, 18A*, 18B*) through which temperature control fluid (TF) flows, wherein the at least one fluid channel (18, 18A, 18B) and the at least one further fluid channel (18*, 18A*, 18B*) flank the solid-state battery cell (3), - wherein the at least one fluid channel (18, 18A, 18B) is fluid-conducting to the fluid outlet (29) of the deflection device (27) and the at least one further fluid channel (18*, 18A*, 18B*) is fluid-conducting to the fluid inlet (28) of the deflection device (27), so that the at least one fluid channel (18, 18A, 18B) and the at least one further fluid channel (18*, 18A*, 18B*) communicate with each other fluid-conductingly by means of the deflection device (27). [15] Processing system (100), comprising - a battery pack (1) according to any of the preceding claims, and - an electrical processing device (110) which has: - a receiving device (111) for interchangeably receiving the battery pack (1), and - an electric drive device (112) which can be supplied with electrical energy from at least one solid-state battery cell (3) of the incorporated battery pack (1).

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