DE102017123274A1 - Energy system for operating a household appliance, vacuum cleaner and temperature control - Google Patents

Abstract

The invention relates to an energy system (2) for operating a household appliance (1), in particular a vacuum cleaner (1), comprising
a path system (10) for guiding an air flow (20),
a pressure generator (13), by means of which the air flow (20) can be generated in the path system (10),
and a battery unit (30) comprising at least one rechargeable battery cell (31) for providing power to the pressure generator (13),
wherein the path system (10) has a battery path section (14) in which the at least one battery cell (31) is arranged, wherein a cell temperature of the at least one battery cell (31) is determined by a tempering flow (21) of the air flow (20) in the battery path section ( 14) can be influenced. Furthermore, the invention relates to a vacuum cleaner (1) and a temperature control method (100) for adjusting the temperature of a battery unit (30).

Description

The present invention relates to an energy system for operating a household appliance, a vacuum cleaner and a temperature control method for adjusting the temperature of a battery unit.

It is known to further equip household appliances with wireless power systems to provide the user with increased flexibility in using the home appliance as well as increased mobility. For this purpose, many household appliances are equipped with rechargeable batteries to design the power supply independently of a power outlet or a corresponding cable. However, it is often expensive to cool these batteries.

Therefore fans are known from the prior art, which supply the household appliance air flow and thereby cool the batteries. A disadvantage of such embodiments, however, is that a permanent, in particular too strong cooling, although a heating of the batteries can prevent a critical temperature, but at the same time can negatively affect the life of the battery.

It is therefore an object of the present invention, above, known from the prior art disadvantages, at least tlw. To fix. In particular, it is the object of the present invention to improve a temperature control of a battery unit in an energy system of a domestic appliance, in order to achieve a long service life and / or high performance of the battery unit.

The above object is achieved by an energy system for operating a household appliance with the features of the first independent device claim, a vacuum cleaner with the features of claim 19 and a tempering with the features of the independent method claim.

Further features and details of the invention will become apparent from the dependent claims, the description and the drawings. In this case, features and details that have been described in connection with the energy system according to the invention, of course, also in connection with the vacuum cleaner according to the invention and / or the temperature control method according to the invention and in each case vice versa, so that with respect to the disclosure of the individual aspects of the invention always reciprocal reference is made or can be.

According to the invention, the energy system for operating a household appliance has a path system for guiding an air flow and a pressure generator, by means of which the air flow in the path system can be generated. Furthermore, the energy system has a battery unit, which comprises at least one rechargeable battery cell for providing energy to the pressure generator. Furthermore, the path system has a battery path section, in which the at least one battery cell is arranged, wherein a cell temperature of the at least one battery cell can be influenced by a tempering flow of the air flow in the battery path section. The tempering flow is variable by a valve mechanism as a function of a defined temperature range of an operating temperature of the battery unit.

Preferably, the household appliance may be a vacuum cleaner. In this case, however, other household appliances come into question, so the energy system, for example, be suitable for operating a hair dryer, a fan or another household appliance. In this case, the path system of the energy system z. B. may be a channel system having a plurality of tubular sections. However, the path system can also be formed at least partially by surrounding components, so that the air flow in the path system, for example, is guided by the boundaries of these components. For the purposes of the present invention, the guiding of the air flow can be understood to be any property of a component which influences, in particular deflects, the air flows in any way in their direction. Preferably, the path system is a substantially closed system which allows the airflow to pass the energy system along a defined path. In order to generate the air flow, a pressure generator is provided, which is designed to generate a pressure difference within the path system, so that the air flow is created. For example, the pressure generator can have a fan or a motor fan, which can preferably be arranged in the path system. The battery unit is further connected to a drive of the pressure generator such that energy of at least one rechargeable battery cell of the battery unit can be made available to the pressure generator. For this purpose, the battery unit may preferably have a plurality of battery cells. By providing the energy of the battery cells or of the at least one battery cell, the pressure generator, which generates the air flow in the path system and thereby contributes to the temperature control of the battery unit, can itself be supplied with energy by the battery unit. In order to temper the battery unit, it is therefore at least partially arranged in the battery path section of the path system, in particular in such a way that a part of the air flow, i. H. the tempering, the battery path section can flow through. Preferably, the air flow and in particular thus also the tempering is generated only by the pressure generator during operation of the energy system or the household appliance, wherein the tempering can also be interrupted or blocked during operation of the energy system. The temperature control of the at least one battery cell can be understood to mean that a temperature of the battery unit, in particular a cell temperature of the at least one battery cell, is cooled or heated by the air flow. The at least one battery cell may, for example, be a lithium-ion cell, preferably wherein the at least one battery cell is designed for operation in the middle temperature range. For lithium-ion cells, the desired, defined temperature range of the cell temperature can be in particular between 0 ° and 100 °, preferably between 10 ° and 80 °, particularly preferably between 20 ° and 40 ° C. Depending on the defined temperature range of the battery unit, the temperature control flow can thus be changed by the valve mechanism. In particular, the variability of the tempering flow can also include complete blocking, so that the tempering flow is prevented. The latter can then lead to an increase in the cell temperature when energy is released or absorbed by the at least one battery cell. In the context of the invention, the valve mechanism can thus be understood in particular to mean a system of components which cooperate in order to change the air flow in the path system, for example to allow it in a first region and to shut it off in a second region. Thus, the valve mechanism can be understood as an arrangement of contiguous and / or structurally and / or spatially separate devices which can influence the air flow. In particular, the valve mechanism may therefore also be referred to as a valve arrangement. For this purpose, the air flow through the valve mechanism can be at least partially steerable and / or blockable.

The operating temperature may preferably be understood as meaning a temperature of the battery unit, in particular of the at least one battery cell. It has also been found that in certain operating conditions of the battery unit it may be advantageous to cool the battery unit and in other operating states of the battery unit it may be advantageous not to cool the battery unit, possibly even to heat. This results in a good compromise for the performance and service life of the battery unit by operating in a certain temperature range. In particular, an operating state of the battery unit can be defined by the operating temperature. Specifically, the defined temperature range of operating temperature may be fixed (e.g., depending on the type of battery cell) or dynamically adaptable during operation of the battery pack (e.g., depending on an operating condition of the battery pack). In particular, the defined temperature range can be a target range in which the battery unit, in particular the at least one battery cell, is to be operated. By the operation of the battery unit in the defined temperature range thus aging of the battery unit or the individual battery cells can be reduced and still the maximum (electrical) power of the battery unit can be used during charging or discharging. Thus, the defined temperature range of the battery unit, for example. From the charging status, d. H. the existing energy reserves in the rechargeable battery cells, depending. Furthermore, the defined temperature range can also take into account the current use of the battery unit. For example, it may be advantageous to change the tempering flow when loading and / or unloading the battery unit.

As a result, the energy system according to the invention advantageously makes it possible to adapt the tempering flow and thus the operating temperature, in particular the cell temperature of the at least one battery cell, to the current performance conditions of the battery unit. In particular, a regulation of the operating temperature of the battery unit can thus be achieved by means of the tempering. For example, the valve mechanism may then energize the tempering flow to cool the battery pack when the operating temperature of the battery pack exits the defined temperature range, i. E. e.g. exceeds a certain temperature limit, and turn off the tempering again, d. H. block the flow of air at least in the battery path section before the temperature of the battery unit falls below a lower temperature at which, for example, the operating temperature can again negatively affect the life and / or performance of the battery unit. Thus, an adaptive temperature control of the battery unit can be realized. By a thereby increased performance of the battery unit, in particular the utilization of a cell capacity of the battery cells can be improved.

In the context of the invention it can be provided that the path system has a path entrance and a path exit, wherein in a normal operation of the household appliance supply air can be sucked through the path input into the path system and exhaust air can be delivered from the path exit. In this case, the path entrance and / or the path exit may preferably be formed by one or more openings in order to allow the ambient air entry or exit possibilities into the path system or out of the Enable path system. Preferably, a main benefit of the household appliance can be effected by the supply air and / or the exhaust air. For example, it is particularly advantageous if the air flow in a vacuum cleaner can be used simultaneously for the temperature control of the battery unit and for suction, ie cleaning, of surfaces. This makes it possible, for example, to use only one pressure generator to fulfill both functions. For example, it may be provided in a vacuum cleaner that the air is first freed from the dust by means of a filter and then enters the path system. Thus, the air flow may be, in particular, suction air. A filter may, for example, be designed as a dust bag, through which the dust can be collected in a predefined space and at the same time the air can be cleaned. Thus, the main benefit of the household appliance, for example, be a cleaning by suction of surfaces. However, the main benefit of the household appliance, which brings the same or similar benefits, but may, for example, in drying, if the household appliance, for example. A hair dryer. In this case, for example, the supply air for controlling the temperature of the battery unit may be provided and the exhaust air, preferably (further) heated and used for drying. However, various other applications, such as. Be mentioned above in the context of a fan, conceivable, which can use the Temperierströmung simultaneously for a main benefit of the household appliance.

It is also conceivable in an energy system according to the invention that the defined temperature range is defined via an operating state which includes a temperature and / or a charging status of the battery unit, in particular at least one of the battery cells. The charging status of the battery unit may be an indicator of the current cooling or heating requirement of the battery unit. In order to achieve an increased accuracy, however, it may also be provided that the operating state takes the temperature directly into account, so that, irrespective of the current use of the battery unit, it is possible to react to any temperature conditions through the valve mechanism. Thus, for example, it is conceivable that at a higher ambient temperature, a tempering flow has to be switched on sooner than at a lower ambient temperature. It is also conceivable that the operating state is defined by other factors which relate to a temperature-relevant property of the energy system or the battery unit.

In the context of the invention may further be provided that the battery path portion is arranged in a flow direction of the air flow in front of the pressure generator. For example. For example, the pressure generator can preferably be designed such that the air flow flows through the pressure generator itself. Thus, the pressure generator may have a fan, which comprises at least one impeller and through which an air flow can be generated. During operation of the pressure generator, thus further heat can be generated which heats the air flow when the air flow flows through the pressure generator or flows past it. If the pressure generator is now arranged in front of the battery path, it can therefore preheat the air flow somewhat. This has the advantage if the air flow is to be heated anyway. Preferably, however, a cooling effect by the air flow should be achievable, so it is advantageous if the air flow is heated only optional or not at all by the pressure generator.

Advantageously, it may be provided in an energy system according to the invention that the battery path section is formed at least partially within a battery housing of the battery unit. This makes it possible, on the one hand, to design the path system in a cost-effective and space-saving manner, in that the battery housing assumes a dual function, namely the steering of the tempering flow and a protective effect of the at least one battery cell. If the battery housing flows through, there is also the advantage that the at least one battery cell can preferably be flowed around directly by the tempering flow and thus a heat exchange between the at least one battery cell and the tempering flow is favored. The battery housing can advantageously be part of an outer housing of the path system and, in particular, at least partially seal the path system or be inserted into a path section of the path system.

Preferably, in the case of an energy system according to the invention, the at least one battery cell can be designed in the manner of a cylinder and arranged such that a flow direction of the tempering flow in the battery housing extends at least substantially perpendicular to a cylinder axis of the at least one battery cell. The fact that the at least one battery cell is transverse to the flow direction of the Temperierströmung, this can be flowed around particularly effectively and thereby favor a temperature compensation. In contrast to an alignment of the at least one battery cell along the flow direction of the tempering while the battery cell is particularly uniformly applied over the length of at least one battery cell with the Temperierströmung, while in a longitudinal arrangement, the Temperierströmung is already slightly heated by the front region of the at least one battery cell and thus already preheated in the rear area and no longer achieves the same cooling effect. Furthermore, a cylinder in the transverse direction by the curved surface has an improved air resistance, so that by arranging the at least one battery cell transverse to the flow direction in this regard, advantages can result from a cylindrical configuration.

Preferably, in an energy system according to the invention, the path system may have a bypass section through which a bypass flow of the air flow to the battery path section can be switched in parallel. The bypass flow is also part of the air flow. By the bypass portion of the air flow, it is possible to maintain the air flow during operation of the household appliance in the path system. This may be possible even if the battery path section is, for example, closed and a temperature control of the battery unit by the air flow is not desired. Thus, with regard to the supply air or the exhaust air at the path entrance or at the path exit, there is only a slight or even no pressure drop or pressure build-up when the battery path section is switched on or off.

Within the scope of the invention, it may further be provided that the valve mechanism comprises a main blocking means, by means of which the tempering flow in the battery path section can be influenced. In particular, in this case, the main blocking means may be designed such that an at least partially releasing of a cross section of a battery path section and at the same time an at least partially closing of a cross section of the bypass section can be effected by opening the main blocking means at least once. Preferably, the thus released part of the cross section of the battery path portion and the thereby closed part of the cross section of the bypass portion may have the same area, in particular wherein the cross section of the battery path portion corresponds to the cross section of the bypass portion at least in the region of the main locking means. The main blocking means may, for example, be designed as a valve. Different valve forms can be considered. Thus, the main blocking means may be, for example, a through valve, a throttle valve or the like and a flow through the battery path section by the air flow by means of a butterfly valve, a ball valve or the like influence. Particularly preferably, the main blocking means may comprise a gate valve, which at the same time causes an occlusion of the bypass section in an opening of the battery path portion in the same way. Thereby, a pressure state prevailing in the path system can be maintained, in particular so that an actuation of the valve mechanism remains hidden to a user during the use of the household appliance, in particular with respect to the main benefit. As a result, the comfort or the perceived quality of the household appliance can be positively influenced.

In the context of the invention, it is also conceivable that the path system has a return section through which a return flow of the air flow from the pressure generator to the battery unit can be conducted. For example, the air can be preheated in the pressure generator and then returned to the battery unit in order to heat it. This makes it possible in particular without further active heating means to influence the temperature of the battery unit. For example, the recirculation section may be closed and the supply air battery path section may be opened to cool the battery unit and the supply air battery path section closed and the recirculation section opened to the battery path section to heat the battery unit. As a result, a different tempering, in particular heating and / or cooling, can be realized for different operating states. In addition, while using less active components, further benefits are gained by these components, such as the pressure generator. Through such multiple benefits of individual components costs in development and assembly can be saved and quality control can be simplified.

It can be provided within the scope of the invention that the valve mechanism comprises a return-blocking means, which is designed to influence the return flow of the air flow. The return-blocking means may preferably have a valve and thus form an easy way to design the return flow switched on or off. The restraining means may, as well as the main locking means, while, for example. Have a gate valve, a butterfly valve or a ball valve. In addition, however, other embodiments are conceivable.

Preferably, in an energy system according to the invention, the valve mechanism may comprise a closure unit, by which the path entrance and / or the path exit can be closed. Preferably, both the path input and the path output can be closed by the closure unit. As a result, an air circuit can be generated which comprises an air guide through the battery path section and the return section, in particular consists at least substantially of the air guide through the battery path section and the return section. If, for example, an increased temperature is required for the battery unit due to the operating state, can thereby the air flow are heated by the pressure generator, then return to the battery unit through the return section, heat them and returned to the pressure generator. As a result, rapid heating of the battery unit can be realized. This can, for example, lead to the cell temperature of the at least one battery cell increasing, as a result of which an internal resistance of the at least one battery cell drops and the performance thereby increases. Thus, for example, the battery unit can be brought into a kind of boost mode to retrieve a particularly high performance. The closure unit can preferably have a closure means, in particular a valve, at the path entrance and a further closure means, in particular a further valve, at the path exit. The valves at the path entrance and path exit can also be spatially and / or structurally separated.

It is also conceivable that in an energy system according to the invention, the valve mechanism has an actuating means which is designed such that by the actuating means, the main blocking means and / or the locking means and / or the closure unit is automatically actuated at a limit temperature of the battery unit. Preferably, therefore, the actuating means can be arranged on the main blocking means in order to be provided as close as possible to the at least one battery cell, so that its temperature can influence the main blocking means. Thus, it is, for example, possible to provide by the actuating means an automatic adjustment of the valve mechanism, so that this alone can change the Temperierströmung due to the temperature.

Preferably, the limit temperature can be adapted. Thus, the actuating means may be designed for various applications and provide a separate limit temperature for each application.

It may further be provided in an energy system according to the invention that the actuating means has at least a first and a second material portion, wherein the first and the second material portion have mutually different thermal expansion coefficients. Thus, the actuating means may, for example, be provided as a bimetal element, which has two different metal layers and, due to the different thermal expansion of the two metal layers, a bend is initiated, which actuates the main blocking means or the restraining means or the closure unit accordingly. Thus, it is not necessary to provide an electronic control or may be given in combination with an electronic control redundancy, so that the actuating means also works when, for example, the controller, for example, fails.

Furthermore, in the case of an energy system according to the invention, the valve mechanism can advantageously be connected to a control unit, by means of which the valve mechanism can be activated as a function of the defined temperature range. The control unit may for this purpose have a printed circuit board, which comprises a computing unit for data processing. Thus, for example, the control unit in response to a battery management system of the battery unit actuate the valve mechanism. Furthermore, various sensors, such as, for example, temperature and / or pressure sensors, may be designed to record measured data in the path system and determine the defined temperature range and / or the operating state of the battery unit based on the measured data, so that the control unit can in turn control the valve mechanism. In particular, this provides an accurate and programmable control of the valve mechanism.

In an energy system according to the invention, the control unit can furthermore be in communication with a measuring unit, wherein the measuring unit has a first detection means for detecting the cell temperature of the at least one battery cell and / or at least one air temperature sensor for detecting an air temperature of the air flow. By the measuring unit different data from the current operating state of the battery unit can be made available in the control unit. Thus, for example, directly the cell temperature of the at least one battery cell can be measured and based on the valve mechanism can be actuated via the control unit. Additionally or alternatively, however, an air temperature sensor for detecting the air temperature is conceivable, so that it is indirectly possible to deduce the defined temperature range and / or a current operating temperature or to compare the data of the first detection means for detecting the cell temperature with the data of the air temperature sensor or several air temperature sensors can. As a result, measurement uncertainties can be reduced. A temperature on a pressure side of the pressure generator, on the path input and / or output of the path system and / or in the battery path section and / or in the return section and / or in the bypass path section can preferably be measured via further air temperature sensors in order to obtain further data of the system and to obtain a more accurate picture of the operating state of the battery unit or the energy system. Therefore, air temperature sensors may preferably be present at the path entrance and exit of the path system, in the battery path section and in the bypass path section and / or in the Return section be arranged in order to detect a temperature distribution within the path system as accurately as possible.

Within the scope of the invention, it may further be provided that the measuring unit comprises at least one pressure sensor for detecting a pressure within the air flow. In addition, in particular, in each case a pressure sensor for measuring pressure in the battery path section and / or in the surrounding section and / or in the return section may be provided via the pressure sensor unit. About the pressure detection in the individual areas of the path system more data about the operating temperature of the battery unit and / or the energy system can be obtained and thus the temperature control of the battery unit can be optimized. Thus, losses can be detected via the pressure sensors and taken into account accordingly via the control unit in order to obtain an accurate picture of the operating temperature of the battery unit and / or to more accurately determine the defined temperature range.

It is also conceivable in an energy system according to the invention that in the path system, an active temperature control is provided, which is adapted to cool at least the Temperierströmung the air flow and / or to heat before the Temperierströmung the at least one battery cell passes. The active temperature control means may comprise, for example, a heat exchanger through which a cooling fluid flows in order to cool the tempering flow. Additionally or alternatively, the temperature control means may comprise a heating element, which, for example, may be energized to generate heat. Particularly preferably, a form of the temperature control means designed for cooling can also be supplied with current. Thus, for example, the active temperature control means may be formed as a Peltier element. Due to the additional active temperature control, the temperature of the battery unit can be further optimized to allow, for example. A faster heating or faster cooling while maintaining the operating temperature, in particular the cell temperature in the defined temperature range.

In an energy system according to the invention, the path system is preferably arranged behind an air filter, by means of which the air can be cleaned of foreign particles. Thus, foreign particles in the path system can negatively influence a temperature control of the battery unit, since these, for example substantially independent of the air flow, can collect on the battery unit or deposit on the at least one battery cell and thereby heat exchange the at least one battery cell with the air flow can affect negatively.

According to a further aspect of the invention, a vacuum cleaner is claimed which comprises an energy system according to the invention. Thus brings a vacuum cleaner according to the invention with the same advantages, as they have been explained in detail already with regard to an inventive energy system. As already explained above, the advantages in a vacuum cleaner, for example, be supplemented by the fact that the suction air of the vacuum cleaner for the air flow and / or the tempering can be used.

• - Erzeugen einer Luftströmung in einem Pfadsystem des Energiesystems,
• - Ermitteln einer Betriebstemperatur der Batterieeinheit,
• - Beeinflussen einer Zelltemperatur der wenigstens einen Batteriezelle durch eine Temperierströmung der Luftströmung in einem Batteriepfadabschnitt,
• - Verändern der Temperierströmung in Abhängigkeit von einem definierten Temperaturbereich der Betriebstemperatur der Batterieeinheit.

According to a further aspect of the invention, a temperature control method for adjusting the temperature of a battery unit with at least one rechargeable battery cell in an energy system for operating a household appliance, in particular a vacuum cleaner, claimed. The tempering process comprises the following steps:

• Generating an air flow in a path system of the energy system,
• Determining an operating temperature of the battery unit,
• Influencing a cell temperature of the at least one battery cell by a tempering flow of the air flow in a battery path section,
• - Changing the tempering as a function of a defined temperature range of the operating temperature of the battery unit.

Preferably, the energy system is an energy system according to the invention and / or the vacuum cleaner is a vacuum cleaner according to the invention. Thus, a tempering method according to the invention brings about the same advantages as have already been explained in detail in relation to an energy system according to the invention. By changing the tempering as a function of the defined temperature range of the battery unit depending on the situation in which the battery unit is located, a temperature to be adjusted to increase the performance of the battery unit and the life.

In the context of the invention may further be provided that in a normal operation of the household appliance supply air is sucked through the path input into the path system and exhaust air is discharged from the path output. Preferably, a main benefit of the household appliance can be effected by the supply air and / or the exhaust air. As a result, for example, the suction air of a vacuum cleaner can be used at the same time to temper the battery unit of the vacuum cleaner. Preferably, the supply air may be fresh air, which is sucked in from the environment of the household appliance. Thus, the supply air can previously through Filtered a filter, for example, in the case of a vacuum cleaner, first filter out dust from the air before it enters the path system as supply air.

• - Erfassen der Zelltemperatur der wenigstens einen Batteriezelle.

In the context of the invention, it may further be provided that the operating temperature comprises the cell temperature of the battery unit, in particular of the at least one battery cell, and the tempering method further comprises the following step:

• - Detecting the cell temperature of the at least one battery cell.

Thus, in the context of the tempering process, a change in the tempering flow as a function of the cell temperature can be made. The cell temperature of the battery unit may be a particularly significant operating temperature of the battery unit. Thus, the cell temperature is immediately a temperature which affects the life or performance of the battery unit. A charging status of the battery unit and / or the at least one battery cell in turn may preferably indicate the cell temperature or allow a prediction for this.

• - Erfassen der Temperatur der Luftströmung an einem Pfadeingang des Pfadsystems und/oder an einer Druckseite eines Druckerzeugers, mit dem die Luftströmung in dem Pfadsystem erzeugt wird, und/oder in einem Batteriepfadabschnitt,

wobei das Ergebnis der Temperaturerfassung der Luftströmung beim Verändern der Temperierströmung berücksichtigt wird.In the context of the invention, it may further be provided that the tempering method further comprises the following step:

• Detecting the temperature of the air flow at a path input of the path system and / or at a pressure side of a pressure generator, with which the air flow is generated in the path system, and / or in a battery path section,

wherein the result of the temperature detection of the air flow is taken into account when changing the tempering.

By detecting the further parameters, an accuracy of the adjustability of the temperature control of the battery unit can be further improved. In this case, reference is made to the above statements on the energy system and its advantages.

In the context of the invention, it can further be provided that the tempering flow of the air flow in a battery path section is changed by a change in a flow-through cross section of the battery path section. So this can be done within a simple embodiment via a valve. As a result, with little space requirement and with simple means, a change in the tempering be achieved without, for example, to change the power of the pressure generator.

Preferably, in a tempering method according to the invention, the at least one battery cell can be of cylindrical design and the tempering flow can flow around the at least one battery cell perpendicular to a cylinder axis of the at least one battery cell. The flow perpendicular to the cylinder axis leads to a uniform temperature of at least one battery cell and at the same time to a particularly effective temperature, without affecting the flow conditions negative. Thus, the flow is opposed only by the semicircular cross-section of the at least one cylinder-like battery cell and can be flowed around without causing turbulence to a great extent.

In a tempering method according to the invention, it can further be provided that a bypass flow and / or a return flow of the air flow is activated as a function of the defined temperature range. As a result, in particular without changing the power of the pressure generator, different operating scenarios can be generated in order to heat the battery unit, or to cool it particularly effectively. By the bypass flow, for example, in a vacuum cleaner, the suction air flow can continue to be ensured, even if the battery path section is closed.

• - Erfassen eines Drucks in der Umgehungsströmung und/oder der Rückführungsströmung,

wobei das Ergebnis der Druckerfassung beim Verändern der Temperierströmung der Batterieeinheit einbezogen wird. Dadurch kann die Genauigkeit der Einstellung der Temperatur der Batterieeinheit weiter gesteigert sein, da auch bspw. Druckverluste innerhalb des Energiesystems erfasst sein können.Furthermore, it can be provided in a tempering method according to the invention that the tempering process comprises the following step:

• Detecting a pressure in the bypass flow and / or the return flow,

wherein the result of the pressure detection when changing the tempering of the battery unit is included. As a result, the accuracy of the adjustment of the temperature of the battery unit can be further increased, since, for example, pressure losses within the energy system can also be detected.

It is also conceivable that in a tempering method according to the invention a path entrance and / or path exit is closed as a function of the defined temperature range, so that the air flow at least substantially circulates in an air circuit. As a result, a particularly rapid heating of the battery unit can be realized. As a result, the battery unit can, for example, be placed in a boost mode in which it can have an increased power output.

In the context of the invention, it is also conceivable that, depending on the defined temperature range, at least the tempering flow is heated or cooled before the tempering flow passes through the at least one battery cell. This can in particular by an active temperature control be realized, which has already been described in detail in the context of the energy system. As a result, the tempering effect of the tempering flow on the battery unit can be supported. Thus, for example, the temperature control by the heating or cooling may have a low dependence on the temperature of the ambient air, so that a reliable temperature control of the battery unit can be achieved even at different ambient temperatures.

• 1 ein erfindungsgemäßes Energiesystem in schematischer Darstellung in einem ersten Darstellungsbeispiel,
• 2 ein erfindungsgemäßes Energiesystem in schematischer Darstellung in einem weiteren Ausführungsbeispiel,
• 3 ein erfindungsgemäßes Energiesystem in schematischer Darstellung in einem weiteren Ausführungsbeispiel,
• 4 einen Staubsauger mit einem erfindungsgemäßen Energiesystem in schematischer, tlw. geschnittener Ansicht,
• 5a, 5b eine Batterieeinheit für ein Energiesystem in schematischer Darstellung in einem weiteren Ausführungsbeispiel,
• 6 ein Betätigungsmittel in einem weiteren Ausführungsbeispiel in schematischer Ansicht,
• 7 ein erfindungsgemäßes Temperierverfahren in schematischer Darstellung.

Further, measures improving the invention will become apparent from the following description of some embodiments of the invention, which are shown schematically in the figures. Any features and / or advantages resulting from the claims, the description or the drawings, including constructive details, spatial arrangements and method steps, can be essential to the invention, both individually and in the most diverse combinations. It should be noted that the figures have only descriptive character and are not intended to limit the invention in any way. Show it:

• 1 an inventive energy system in a schematic representation in a first representation example,
• 2 an inventive energy system in a schematic representation in a further embodiment,
• 3 an inventive energy system in a schematic representation in a further embodiment,
• 4 a vacuum cleaner with an energy system according to the invention in a schematic, partly cutaway view,
• 5a . 5b a battery unit for an energy system in a schematic representation in a further embodiment,
• 6 an actuating means in a further embodiment in a schematic view,
• 7 an inventive tempering in a schematic representation.

For the following figures, the identical reference numerals are used for the same technical features, even of different embodiments.

1 shows an inventive energy system 2 in a first embodiment in a schematic view. This is where the energy system points 2 a battery unit 30 on which with a battery case 32 and battery cells 31 in a battery path section 14 a path system 10 of the energy system 2 is arranged. To a flow of air 20 in the path system 10 to generate, the energy system points 2 also a pressure generator 13 on, which includes a fan. The path system 10 indicates in relation to the flow conditions of the air flow 20 in a parallel connection to the battery path section 14 a bypass section 15 on. About the blower can in the bypass section 15 and / or the battery path section 14 a bypass flow 22 or a tempering flow 21 be generated. This is done at a path entrance 11 of the path system 10 supply air 24 sucked in and on a pressure side 13.1 of the pressure generator 13 at the path exit 12 of the path system 10 as exhaust air 25 issued. The air flow 20 is doing, as shown on the pressure generator 13 produced, but can also be the tempering 21 and the bypass flow 22 and at least partially the exhaust air 25 and the supply air 24 include. It turned out that it is for the battery unit 30 , in particular the battery cells 31 , not in every application is beneficial to cool these. For example, leads to a higher cell temperature of the battery cells 31 to that the internal resistance of the battery cells 31 drops and the battery cells 31 thus be particularly powerful. That's why it's the energy system 2 provided, the air flow 20 in the path system 10 of the energy system 2 to generate and in particular at the same time an operating temperature and / or a defined temperature range of the operating temperature of the battery unit 30 to investigate. Because of the tempering 21 the air flow 20 in the battery path section 14 which at least partially through the battery case 32 is formed, a cell temperature of at least one of the battery cells 31 is thus influenced, depending on the defined temperature range of the battery unit 30 the tempering flow 21 to be changed. The tempering flow 21 So can the battery path section 14 and thus the battery case 32 flow through. As a result, a convection, ie a temperature compensation between Temperierströmung 21 and battery cell 31 , favors. For example, cool air gets through the battery cells 31 heated and then by means of the tempering 21 dissipated, allowing more air to heat exchange with the battery cells 31 can accomplish. Therefore, an effective change in the cell temperature of the battery cells 31 by means of the tempering flow 21 possible. For changing the tempering flow 21 and thus influencing the cell temperature is a valve mechanism 40 provided, which is a main locking means 41 indicates the flow conditions in the path system 10 to vary. As shown, is the main blocking means 41 preferably designed as a slide, so that by an at least tlw. Open the main locking means 41 at least partially releasing a cross-section 14.1 of the battery path section 14 and at the same time an at least partly closing a cross-section 15.1 of the bypass section 15 is feasible. Preferably, the thereby released part of the cross section 14.1 of the battery path section 14 and the thereby closed part of the cross section 15.1 of the bypass section 15 have the same area. In particular, the cross section 14.1 of the battery path section 14 the cross section 15.1 of the bypass section 15 at least in the area of the main blocking means 41 correspond. Thus, although a different distribution of the air flow 20 in the path system 10 causes, but in particular the pressure conditions remain in relation to the supply air 24 and the exhaust air 25 essentially unchanged. Thus, the energy system 2 especially in a household appliance 1 be used to provide this a higher mobility through a wireless power supply. Thus, for example, there are further advantages in a vacuum cleaner or another household appliance, which in any case has a main benefit, which aims to produce an air flow. So can the supply air 24 and / or the exhaust air 25 in particular a main benefit of the household appliance 1 cause. This can be done by the same pressure generator 13 on the one hand, a temperature control of the battery unit 30 be effected on the other hand, the main benefits, such as. Suctioning of surfaces, are met. The control or regulation of the tempering flow 21 takes place as a function of the defined temperature range, which is a temperature and / or a charging status of the battery unit 30 , in particular the battery cells 31 , may include or may be defined above. Thus, for example, the respective battery unit 30 directly with a control unit 50 and / or may be a first means of detection 52 for detecting a cell temperature of the battery cell 31 be provided, which with the control unit 50 communicates. Preferably, the first detection means 52 while near one of the battery cells 31 or directly to one of the battery cells 31 to be appropriate. Depending on the operating state detected thereby, in particular the operating temperature, the control unit then controls 50 according to the valve mechanism 40 to the tempering flow 21 to regulate, in particular on or off. In addition or as an alternative to detecting the operating state, an air temperature sensor may also be provided 53 be provided for detecting an air temperature. Thus, multiple air temperature sensors 53 be arranged at different locations of the path system, wherein, for example, the bypass section 15 , the path entrance 11 and / or the path exit 12 for the positioning of the air temperature sensors 53 may advantageously be provided, since significant temperatures are to be expected at these locations. This allows the accuracy of the method for temperature control of the battery unit 30 can be improved, since measurement inaccuracies in relation to the operating state of the battery unit 30 can be compensated. In addition, it may be advantageous at least one pressure sensor 54 provide, if necessary, pressure losses within the path system 10 to recognize, since this also affects the measurement result or the corresponding control or regulation with respect to the operating state of the battery unit 30 can have. Preferably, in each case a pressure sensor 54 in the bypass section 15 and in the battery path section 14 be arranged. To the effectiveness of the temperature control of the battery unit 30 to increase, are the battery cells 31 , which are designed like a cylinder, with a cylinder axis 31.1 perpendicular or at least substantially perpendicular to the flow direction of the tempering 21 arranged. Essentially, it refers to the fact that, for example, it is not necessary that an entire vector field of the tempering flow 21 perpendicular to the cylinder axis 31.1 shows, but only individual areas and / or components. As a result, they can be flowed around uniformly and at the same time offer a low flow resistance, in particular without the need for special aerodynamic characteristics. In addition, a temperature control 45 be provided, which is the air flow 20 , in particular the tempering flow 21 , can pre-temper, before the tempering 21 the battery unit 30 reached. So can the temperature control 45 For example, be provided as a coolant or as a heating means to a corresponding cooling or heating of the battery unit 30 to be able to carry out as quickly as possible. For this purpose, the temperature control 45 For example, be designed as a heating coil or as a Peltier element. Preferably, the temperature control 45 also with the control unit 50 communicate to the control unit 50 to be controllable.

2 shows an inventive energy system 2 in a further embodiment. Here is the energy system 2 of the second embodiment essentially constructed, as well as the energy system 2 of the first embodiment, so that reference is made to the comments on the first embodiment. In addition, the path system points 10 of the energy system 2 of the second embodiment, a return section 16 in which a recirculation flow 23 the air flow 20 after passing the pressure generator 13 the air flow 20 to the battery unit 30 can be returned. This is indicated by the valve mechanism 40 next to the main locking device 41 , which is a tempering flow 21 from the supply air 24 can cut off a reverse blocking agent 42 on which the return section 16 or the recirculation flow 23 can regulate. In particular, the recirculation flow 23 through the pressure generator 13 be preheated and thus when returning to the Battery path section 14 to a faster heating of the battery unit 30 or the battery cells 31 to lead. It can also be provided, the supply air 24 and the recirculation flow 23 each to be combined and dosed as Temperierströmung 21 the battery unit 30 supply. This can always be an optimum temperature of the tempering 21 be reached, the operating temperature of the battery unit 30 for the defined temperature range. Also the reverse lock 42 can from the control unit 50 be controllable.

3 shows an energy system 2 with a path system 10 in a further embodiment. The energy system 2 of the third embodiment is substantially formed, as the energy system 2 of the second embodiment, wherein the path system 10 a return section 16 , a battery path section 14 and a bypass section 15 having. Therefore, the comments on the second and the first embodiment of the energy system 2 Referenced. In addition, the valve mechanism points 40 of the third embodiment in addition to the main locking means 41 and the locking means 42 a closure unit 43 with closure means 43.1 on which the path entrance 11 and the path exit 12 of the path system 10 of the energy system 2 can close. This makes it possible to create a closed circuit of the air flow by means of the pressure generator when the closure means 43.1 are closed. This air circuit then essentially comprises the return section 16 and the battery path section 14 so that air is preheated by the pressure generator or its waste heat, via the recirculation streams 23 through the return section 16 to the battery unit 30 is performed there as Temperierströmung 21 the battery unit 30 heated and then again to the pressure generator 13 flows around there to be reheated. This is a particularly effective, rapid heating of the battery unit 30 possible, for example, in a boost mode, the performance of the battery unit 30 to increase.

4 shows a vacuum cleaner according to the invention 1 with an energy system 2 in a further embodiment. This is where the energy system points 2 of the vacuum cleaner 1 a path system 10 in which an airflow 20 by a pressure generator 13 can be generated. The path system 10 is behind an air filter 3 arranged. This will air, which as supply air 24 in the path system 10 enters, first cleaned of dirt. In addition, the pressure generator 13 adapted to generate the suction air, which the main benefit, namely the suction of surfaces for cleaning the surfaces of the vacuum cleaner 1 represents or contributes to the main benefit. The vacuum cleaner 1 is there with an energy unit 30 designed, which energy to operate the pressure generator 13 can provide. At the same time is the battery unit 30 via a tempering flow 21 the air flow 20 in the path system 10 temperature-controlled. The path system 10 has on the one hand a bypass section 15 in which a bypass flow 22 can flow, so that air around the battery unit 30 can be transported around. For tempering the battery unit 30 however, it is also inside a battery case 32 a battery path section 14 formed, in which the tempering 21 can flow to rechargeable battery cells 31 the battery unit 30 to cool or to heat. For this purpose, the battery case 32 a valve mechanism 40 on, in which a main locking means 41 The tempering flow is designed for this purpose 21 to regulate. Behind the battery section 14 or the bypass section 15 is the pressure generator 13 arranged, through which the air flow 20 can flow, and to a path exit 12 of the path system 10 is led to as exhaust air 25 from the vacuum cleaner 1 to be blown out. This allows the vacuum cleaner 1 be operated wirelessly, with a double benefit of the generated air flow 20 is obtained in that these for cleaning surfaces and for controlling the temperature of the battery unit 30 as a function of a defined temperature range of an operating temperature of the battery unit 30 to be used. The valve mechanism 40 can do this via a control unit 50 be controlled, which, for example, may be part of a battery management system.

The 5a and 5b show schematically a battery case 32 for an energy system 2 which is a main blocking agent 41 has a flow of air 20 in the battery case 32 let in or the battery case 32 to block. By the air flow can thus a tempering 21 the battery unit 30 be generated. Is the main locking means 41 the valve mechanism 40 closed, the battery case becomes 32 via a bypass flow 22 flows around. This is in 5a shown. 5b shows an opened main locking means 41 , so that a tempering 21 is admitted and an air flow 20 in a bypass flow 22 and a tempering flow 21 splits, with the bypass flow 22 the battery case 32 flows around and the tempering 21 through the battery case 32 flows to the battery unit 30 to temper. The main locking device 41 has an actuating means 44 on, which in particular may be designed to open automatically due to temperature effects. For this purpose, the actuating means 44 eg according to 6 be educated. In particular, by actuating means 44 direct or indirect force is exerted on a flap and thereby the flap can be actuated. One battery case 32 as in the 5a and 5b can also advantageously in the embodiments of the 1 to 4 , particularly preferably the 1 and 4 , are used.

6 shows an actuating means 44 , which is a first material section 44.1 and a second material portion 44.2 having. In this case, the material sections 44.1 . 44.2 mutually different coefficients of thermal expansion, so that when changing the ambient temperature, for example, the second material section 44.2 can expand further than the first material section 44.1 , Here are the material sections 44.1 . 44.2 However, firmly connected, so that the actuating means 44 is bent and thereby, for example, an opening of the main locking means 41 can cause.

7 shows a schematic representation of process steps of a temperature control method according to the invention 100 , Here is the temperature control 100 provided a temperature adjustment of a battery unit 30 with at least one rechargeable battery cell 31 in an energy system 2 for operating a household appliance 1 to effect. In accordance with a method step 101 is initially provided, an air flow 20 in a path system of the energy system 2 to create. In a normal operation of the household appliance 1 supply air 24 through the path entrance 11 in the path system 10 be sucked in and exhaust air 25 from the path exit 12 be discharged, in particular where by the supply air 24 and / or the exhaust air 25 a major benefit of the household appliance 1 can be effected. Thus, it may be in the household appliance 1 preferably to a vacuum cleaner. In particular, at the same time, in addition, an operating temperature of the battery unit is provided 30 to determine, wherein the operating temperature, for example, a cell temperature of the battery unit 30 may include. In order to be able to determine the operating temperature, it is thus preferable to detect the cell temperature and preferably a charging status of the battery unit 30 or at least one battery cell 31 in one step 102.1 be provided. Additionally or alternatively, further detection may be included 102.2 at least one temperature of the air flow 20 and / or capture 102.3 a pressure, in particular a bypass flow 22 and / or a recirculation flow 23 , be provided. As a result, measurement uncertainties and possibly flow losses can be taken into account in order to obtain a more accurate definition of the defined temperature range and / or a more accurate, current value of the operating temperature of the battery unit 30 to obtain. In particular, this can be a valve mechanism 40 be controlled more precisely to reach or maintain the defined temperature range. Furthermore, in the tempering process 100 in a process step 103 provided, a cell temperature of the at least one battery cell 31 by a tempering flow 21 the air flow 20 in a battery path section 14 to influence. This can preferably be done by adjusting valve elements of the valve mechanism 40 be performed. This can ensure that the battery unit, for example, not overheated. Depending on the defined temperature range of the operating temperature, which previously, in particular in the context of the method step 102 has been determined, then a change 104 the tempering flow 21 provided, in particular when a cooling of the battery unit 30 is no longer necessary. This allows the battery unit 30 always optimally cooled or heated to the temperature of the battery unit 30 to operate in an optimal temperature range during operation. Preferably, the method 100 for operating one of the energy systems of one of the embodiments of 1 to 3 or the vacuum cleaner of the embodiment of 4 be used.

The above explanation of the embodiments describes the present invention solely by way of example. Of course, individual features of the embodiments, if technically feasible, can be combined freely with one another, without departing from the scope of the present invention.

LIST OF REFERENCE NUMBERS

1

Household appliance, in particular vacuum cleaner

2

energy system

3

air filter

10

path system

11

path input

12

path output

13

pressure generator

13.1

pressure side

14

Battery path section

14.1

Cross section of 14

15

bypass section

15.1

Cross section of 15

16

Return section

20

airflow

21

Temperierströmung

22

bypass flow

23

Recirculation flow

24

supply air

25

exhaust

30

battery unit

31

battery cell

31.1

cylinder axis

32

battery case

40

valve mechanism

41

Main blocking means

42

Rear locking means

43

shutter unit

43.1

closure means

44

actuating means

45

temperature control

50

control unit

51

measuring unit

52

first detection means

53

Air temperature sensor

54

pressure sensor

100

tempering

101

Create 20

102

Determine an operating temperature of 30

102.1

Detecting a cell temperature of 31

102.2

Detecting a temperature of 20

102.3

Detecting a pressure

103

Affecting a cell temperature of 31

104

Changing 21

Claims (15)

Energy system (2) for operating a household appliance (1), in particular a vacuum cleaner (1), comprising a path system (10) for guiding an air flow (20), a pressure generator (13), by means of which the air flow (20) can be generated in the path system (10), and a battery unit (30) comprising at least one rechargeable battery cell (31) for providing power to the pressure generator (13), wherein the path system (10) has a battery path section (14) in which the at least one battery cell (31) is arranged, wherein a cell temperature of the at least one battery cell (31) is determined by a tempering flow (21) of the air flow (20) in the battery path section ( 14) can be influenced, wherein the Temperierströmung (21) by a valve mechanism (40) in response to a defined temperature range of an operating temperature of the battery unit (30) is variable. Energy system (2) according to the preceding claim, characterized in that the path system (10) has a path entrance (11) and a path exit (12), wherein in a normal operation of the household appliance (1) supply air (24) through the path entrance (11) in the path system (10) is sucked in and exhaust air (25) from the path exit (12) can be discharged, in particular wherein by the supply air (24) and / or the exhaust air (25), a main benefit of the household appliance (1) can be effected. Energy system (2) according to one of the preceding claims, characterized in that the battery path portion (14) in a flow direction of the air flow (20) in front of the pressure generator (13) is arranged. Energy system (2) according to any one of the preceding claims, characterized in that the battery path portion (14) at least partially within a battery housing (32) of the battery unit (30) is formed, in particular wherein the at least one battery cell (31) is formed like a cylinder and arranged in that a flow direction of the tempering flow (21) in the battery housing (32) runs at least substantially perpendicular to a cylinder axis (31.1) of the at least one battery cell (31). Energy system (2) according to one of the preceding claims, characterized in that the path system (10) has a bypass section (15) through which a bypass flow (22) of the air flow (20) to the battery path section (14) is connected in parallel. Energy system (2) according to one of the preceding claims, characterized in that the valve mechanism (40) comprises a main blocking means (41) through which the tempering (21) in the battery path section (14) can be influenced, in particular wherein the main blocking means (41) in such a way is formed by at least partially opening the main locking means (41) at least partially releasing a cross section (14.1) of the battery path portion (14) and at the same time at least partially closing a cross section (15.1) of the bypass section (15) is effected. Energy system (2) according to any one of the preceding claims, characterized in that the path system (10) has a return section (16) through which a return flow (23) of the air flow (20) from the pressure generator (13) to the battery unit (30) can be conducted in particular, wherein the valve mechanism (40) comprises a restraining means (42) which is adapted to the Return flow (23) of the air flow (20) to influence. Energy system (2) according to one of the preceding claims, characterized in that the valve mechanism (40) comprises an actuating means (44) which is formed such that by the actuating means (44) the main blocking means (41) and / or the restraining means (42 ) and / or the closure unit (43) is automatically actuatable at a limit temperature of the battery unit (30), in particular wherein the actuating means (44) at least a first and a second material portion (44.1, 44.2), wherein the first and the second material portion ( 44.1, 44.2) have mutually different thermal expansion coefficients. Energy system (2) according to one of the preceding claims, characterized in that the valve mechanism (40) is connected to a control unit (50), by means of which the valve mechanism (40) is controllable in dependence on the defined temperature range, in particular wherein the control unit (50 ) is in communication connection with a measuring unit (51), wherein the measuring unit (51) has a first detection means (52) for detecting the cell temperature of the at least one battery cell (31) and / or an air temperature sensor (53) for detecting an air temperature of the air flow (20 ) having. Stauauger (1) comprising an energy system (2) according to any one of the preceding claims. Temperature control method (100) for adjusting the temperature of a battery unit (30) with at least one rechargeable battery cell (31) in an energy system (2), in particular according to one of Claims 1 to 9 , for operating a household appliance (1), preferably a vacuum cleaner (1), in particular according to Claim 10 comprising the following steps: generating (101) an air flow (20) in a path system (10) of the energy system (2), determining (102) an operating temperature of the battery unit (30), influencing (103) a cell temperature of the at least one Battery cell (31) by a Temperierströmung (21) of the air flow (20) in a battery path section (14), - changing (104) the Temperierströmung (21) in response to a defined temperature range of the operating temperature of the battery unit (30). Temperierverfahren (100) after Claim 11 characterized in that in a normal operation of the household appliance (1) supply air (24) is sucked through a path entrance (11) in the path system (10) and exhaust air (25) from a path exit (12) is discharged, in particular wherein by the supply air (24) and / or the exhaust air (25) a main benefit of the household appliance (1) is effected. Temperature control method (100) according to one of Claims 11 or 12 characterized in that the operating temperature comprises the cell temperature of the at least one battery cell (31) of the battery unit (30) and the tempering method (100) further comprises the step of: - detecting (102.1) the cell temperature of the at least one battery cell (31). Temperature control method (100) according to one of the preceding claims, characterized in that the temperature control method (100) further comprises the following step: - detecting (102.2) a temperature of the air flow (20) at a path entrance (11) of the path system (12) and / or on a pressure side (13.1) of a pressure generator (13), with which the air flow (20) is generated in the path system (10), and / or in a battery path section (14), the result of the temperature detection (102.2) of the air flow (20 ) is taken into account when changing (104) the tempering flow (21). Temperature control method (100) according to one of the preceding claims, characterized in that a bypass flow (22) and / or a recirculation flow (23) of the air flow (20) is activated as a function of the defined temperature range and / or that in dependence on the defined temperature range at least the tempering (21) is heated or cooled before the tempering (21) passes the at least one battery cell (31).

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