DE102014203927A1 - Device and method for drying a battery and battery, battery system and vehicle - Google Patents

Abstract

A device (200) for drying a battery (10; 20), characterized by: a heater (230) for generating heat for regeneration of a desiccant (260) capable of absorbing moisture from the battery (10; 20) by releasing the absorbed moisture, an opening (220) through which the moisture from the battery (10, 20) can reach the desiccant (260), and a closure element (240), which can close the opening (220) by means of the generated heat, a battery (10; 20), a battery system, a vehicle, and a method of drying a battery (10; 20).

Description

State of the art

It is foreseeable that both in stationary applications, for example in wind turbines, and in mobile applications, for example in electric vehicles (EV) or hybrid vehicles (hybrid electric vehicles, HEV), as rechargeable electrical energy storage (EES) increasingly new Battery systems, for example with lithium-ion batteries, lithium-polymer batteries or nickel-metal hybrid batteries will be used.

Lithium-ion batteries include a positive electrode (cathode) and a negative electrode (anode), the lithium-ion (Li +) reversible store during loading (intercalation) or outsource (deintercalation) during unloading. Lithium-ion batteries have a high energy density and low self-discharge.

The battery systems must meet very high requirements in terms of usable energy content, charge / discharge efficiency, reliability, life and unwanted capacity loss due to frequent partial discharge.

A battery system includes a plurality of battery cells. Due to their internal cell resistance and the electrochemical processes that take place, the battery cells heat up during charging and discharging. The battery cells can be connected in series (series) to increase the voltage and / or connected in parallel to increase the maximum electric current. In this case, the battery cells can be combined to form battery units or battery modules. When used to drive vehicles, for example, about 100 battery cells (as a traction battery) can be connected in series or in parallel. For example, in a high voltage battery system, the total voltage may be 450V or even 600V.

The permissible for the operation of the battery cells temperature range is typically between -30 ° C and +70 ° C, preferably between +5 ° C and +35 ° C. In the lower range of the operating temperature, the performance of the battery cells can be significantly reduced. At temperatures below about 0 ° C, the internal resistance of the battery cells increases sharply, and the performance and efficiency of the battery cells continue to decrease as temperatures continue to fall. In this case, an irreversible damage to the battery cells can occur. Even if the operating temperature is exceeded, the performance of the battery cells may decrease significantly. At temperatures above approx. 40 ° C, the service life of the battery cells is reduced. In this case, an irreversible damage to the battery cells can also occur. Furthermore, the allowable for the operation of the battery cells temperature difference (temperature gradient) in a battery cell and / or within a battery module or a battery typically between 5 Kelvin and 10 Kelvin. For larger temperature differences, different areas of a battery cell or different battery cells of a battery module or a battery can experience different loads or even (partially) overloaded and / or damaged. Furthermore, due to temperature differences and / or temperature changes, there is a risk of the formation of condensation in the battery. The damage can lead to an accelerated aging of the battery cells or a thermal runaway of the battery cells, which represents a danger to humans and the environment.

In a hybrid powertrain of a vehicle, Li-ion high-performance battery cells are operated with a very high dynamics. During short-term peak loads caused, for example, by recuperation of braking energy during braking or boost assistance during acceleration, the battery cells must in a very short time a high performance (when charging) record or deliver (on discharge). Due to the internal resistance of the battery cells, these short peak loads lead to significant heating of the battery cells. The efficiency of the battery cells when charging or discharging is very high (about 95%); Nevertheless, the resulting waste heat is not negligible. At a traction power of, for example, 60 KW results in a loss of 5%, a power loss of 3 KW. Furthermore, for example, in the summer months or in warmer regions, outside temperatures, which may be 40 ° C and more, outside the allowable temperature range, so that the battery cells without cooling the required life of, for example, ten or 15 years can not reach.

To ensure the safety, function and life of the battery module or battery system, it is therefore necessary to operate the battery cells within the specified temperature range. On the one hand arises, as described above, during operation of the battery cells heat that must be dissipated to prevent heating of the battery cells above the critical maximum temperature. On the other hand, it may be necessary to heat the battery cells at low temperatures to a minimum temperature. To maintain the predetermined temperature range, the battery module or battery system is heated, ie cooled or heated as needed, the cooling is usually required more often than the heater.

For this purpose, the battery may comprise a fluid, for example a liquid such as alcohol, for example propane-1,2,3-triol (glycerol, glycerol), oil or water, a liquid mixture or a refrigerant, as a temperature control agent, for example coolant or refrigerant in a temperature control medium circuit ,

Thus, in case of damage (leakage) of the temperature control medium circuit in the battery system tempering, for example water, are released. From a certain pressure difference zwischem the interior of the battery system and the environment is a pressure compensation. The pressure compensation can be done for example via a pressure balancing unit (PBU). If a housing of the battery system is not hermetically sealed (gas-tight), moisture, for example in the form of water vapor, can constantly penetrate into the battery system, for example through the pressure compensation element or seals. Since the tempering agent temperature is significantly lower than the temperature in the housing during cooling of the battery system, condensate (condensed water, condensation water) may form. Thus, in the battery system, water can form and / or accumulate in liquid form, either pure or as a liquid mixture. Liquid water, for example raindrops, mist droplets and solid water, for example ice and snow crystals, are not included in the humidity.

The battery systems, however, like all electrical, electronic or information technology devices in general, are very sensitive to the presence of fluids in liquid form, for example liquids such as water, as these, for example, short circuit, corrosion, electrochemical migration , Damage to insulation, such as electrical insulation can cause, or at least favor.

When the relative humidity (relative humidity, RH) in the housing is low, the formation of condensation in the housing can be prevented. By disposing a desiccant in the battery system, the liquid can be bound so that the relative humidity in the housing is low. The degree of absorption of the desiccant may increase over time. In principle, the degree of absorption can be determined by means of a weight determination, but it is extremely difficult to carry out in the battery system. However, the absorption capacity of the desiccant is limited. When it is reached, d. H. the desiccant is saturated, additional liquid causes the relative humidity in the housing to rise again, and the humidity in the housing can reach a critical level. Thus, it becomes necessary to dry the existing desiccant, i. H. remove the absorbed liquid or replace it with a fresh desiccant.

Out DE 10 2010 028 861 A1 is already a drying device for reducing the humidity of a gas in a housing interior, in particular in a Batteriegehäuseinnenraum, known, wherein the drying device comprises a desiccant body and a fixing device for positive and / or non-positive fixation of the desiccant body, by means of which the desiccant body in the housing interior or at least one Part of the inner surface of the housing training positionable. According to the invention, the fixing device is designed such that the desiccant body is reversibly fixable.

Thus, in order to improve the functionality of batteries and battery systems and increase the life of battery cells, it is necessary to improve the drying of batteries and battery systems.

Disclosure of the invention

The devices and methods according to the invention with the features of the independent claims have the advantage that the drying or Regenerieung (regeneration) of the desiccant such as silica, molecular sieve (molecular sieve) or clay-based desiccant can be simplified. In this case, the closure element, which can be actuated by means of the generated heat, close the inlet opening when the absorbed moisture, which may have penetrated from the outside into the battery or originate from a temperature control medium, is released by means of the generated heat. Thereby drying or regeneration of the drying agent in the device for drying the battery, by means of the heating device, for example, a heating element such as an electrically operated heating element, take place. Since the desiccant can thus remain in the battery over the life of the battery, it can be designed as a service life component. Thus, since no repeated or regular replacement of the desiccant over the life of the battery is required, the structure of the device can be simplified. Furthermore, the size of the device can be reduced. In this case, the moisture released during drying or regeneration of the drying agent does not reach the interior of the battery by means of a changeover of the device, but rather directly to the outside. Thus, the desiccant can be dried as needed or regularly, even at short intervals. This can reduce the amount of desiccant. Consequently, the size of the Device can be further reduced. Furthermore, the moisture-related corrosion and thermal stress on the battery cells during drying or regeneration of the desiccant can be avoided. Thus, the aging of the battery cells can be prevented by drying or regenerating the desiccant. Furthermore, the switching of the device between a dehumidification of the battery by means of the desiccant and the drying or Regenerieung the desiccant by heat energy, for example by means of the heating element, take place. This makes it possible to dispense with actuators (actuators) such as electric motors and / or electrically operated valves. Thus, the switching can be simplified. As a result, the structure of the device can be further simplified and the size and weight of the device can be further simplified. Overall, the reliability of the device can be increased. Furthermore, the size, weight and cost of the device can be reduced. Furthermore, the life of the battery cells and thus the entire battery can be increased.

Advantageous embodiments of the present invention are described in the dependent claims.

Conveniently, the closure element can be designed temperature-actuated. As a result, the closing of the opening can be achieved particularly compact.

Conveniently, the closure element may comprise bimetal. As a result, the closure element can be designed to be particularly simple and / or to close or open the opening particularly reliably.

Conveniently, the device may further comprise a temperature-actuable drive device for driving the closure element. As a result, the drive can be objected to by the generated heat from the opening or be spaced less from the heating device. Thus, the heat generated can make the closure of the opening more efficient, faster and more reliable. Furthermore, the closure element can be optimized with respect to the closure of the opening.

Conveniently, the device may further comprise a further opening through which the released moisture can escape from the device, and a further closure element which can open the further opening by means of the generated heat. Thereby, the released moisture can be removed from the device and the battery directly to the outside. Thus, a (re) contact of the moisture with the battery or the battery cells, which can lead to corrosion and / or short circuits, for example, can be avoided. Since the further opening can be opened by means of the generated heat, while the opening can be closed by means of the generated heat, a switch between dehumidification and regeneration can be achieved.

Conveniently, the device may further comprise a further opening through which the released moisture can escape from the device, and a further closure element which can open the further opening by means of an emerging pressure of the released moisture. Thereby, the released moisture can be removed from the device and the battery directly to the outside. Thus, a (re) contact of the moisture with the battery or the battery cells, which can lead to corrosion and / or short circuits, for example, can be avoided. Since the further opening can be opened by means of the resulting pressure, while the opening can be closed by means of the generated heat, the further opening can be designed, for example, as a pressure-controlled valve such as an overpressure valve.

Appropriately, the further closure element may be formed temperature-actuated. As a result, the closing of the further opening can be achieved in a particularly compact manner.

Conveniently, the further closure element may comprise bimetal. As a result, the further closure element can be made particularly simple and / or the additional opening can be opened or closed particularly reliably.

Conveniently, the device may further comprise a temperature-actuable drive device for driving the further closure element.

As a result, the drive can be objected to by means of the generated heat from the further opening or be spaced less from the heating device. Thus, the generated heat can make opening the wider opening more efficient, faster and more reliable. Furthermore, the closure element and the further closure element can be driven by means of a single drive device. As a result, the device can be made particularly compact.

Appropriately, the device may further comprise a temperature-actuable drive device for driving the closure element and the further closure element. As a result, the drive can be objected to by means of the generated heat from the opening and the further opening or be spaced less from the heating device. Thus, the generated Heat the closure of the opening and the opening of the wider opening more efficient, faster and more reliable effect. Furthermore, the further closure element can be optimized with respect to the opening of the further opening.

Conveniently, the temperature actuatable drive means may comprise a strain material, for example, wax for converting the generated heat into motion. As a result, the drive can be achieved particularly easily and reliably.

Conveniently, the temperature-actuated drive device may comprise a return element, for example a return spring. This can be ensured after the generation of heat switching between regeneration and dehumidification.

Conveniently, the apparatus may further comprise processing means connected to the heater for controlling the regeneration of the desiccant. As a result, the dehumidification and regeneration or regeneration and dehumidification switching can be monitored, controlled and / or regulated. As a result, the effect of the device can be adapted, improved or optimized.

Conveniently, the processing means may turn off the heater for a predetermined dehumidification time. As a result, the dehumidification of the battery or of the housing can be effected and ensured.

Conveniently, the processing means may turn on the heater for a predetermined regeneration time. As a result, the regeneration of the desiccant can be effected and ensured. By (repeated) switching between regeneration and dehumidification, the moisture can be removed from the battery. Thus, the life of the battery can be increased.

Conveniently, the apparatus may further comprise a humidity sensor connected to the processing device. Thereby, the amount of moisture absorbed by the desiccant or the saturation of the desiccant can be determined. Thus, the switch between regeneration and dehumidification can be made as needed. Thus, the amount of heat generated can be adjusted, reduced or optimized. This can reduce the amount of energy consumed and the cost. Furthermore, the life of the battery can be further increased.

Conveniently, the processing means may turn off the heater when the absorbed moisture falls below a predetermined lower limit. This can reduce the amount of heat generated. This can further reduce the amount of energy consumed and the cost. Furthermore, the life of the battery can be further increased.

Conveniently, the processing means may turn on the heater when the absorbed moisture exceeds a predetermined upper limit. As a result, the amount of desiccant can be reduced or optimized. Furthermore, the corrosion in the battery can be reduced. Thus, the life of the battery can be further increased.

Conveniently, the device may further comprise a housing or layer of a thermal insulating material for insulating the battery from the heat generated. As a result, the thermal load of the battery cells can be reduced. Thus, their aging can be slowed down. Consequently, the life of the battery can be further increased.

The invention further provides a battery or housing comprising the device described above. In this case, the device can be used for example in the battery or the housing or be formed in a cavity of the battery or the housing.

The invention further provides a battery system comprising the previously described device or battery.

The invention further provides a vehicle, in particular motor vehicle such as electric motor vehicle, hybrid vehicle or electric motorcycle (electric bike, e-bike), electric bicycle (pedal electric cycle, pedelec), a maritime vehicle such as electric boat or submarine (submarine), an aircraft or a Spacecraft, which includes the previously described and connected to the vehicle device, the previously described and connected to the vehicle battery or the previously described and connected to the vehicle battery system.

Conveniently, the closure element can be formed temperature-actuated. As a result, the closing of the opening can be achieved particularly compact.

Conveniently, the closure element may comprise bimetal. As a result, the closure element can be made particularly simple be and / or close the opening particularly reliable or open.

Conveniently, the method may further comprise providing a temperature-actuable drive device for driving the closure element. As a result, the drive can be objected to by means of the generated heat from the opening or can be arranged less spaced by the heating device. Thus, the heat generated can make the closure of the opening more efficient, faster and more reliable. Furthermore, the closure element can be optimized with respect to the closure of the opening.

Conveniently, the method may further comprise providing a further opening through which the released moisture can escape from the device, and providing a further closure element which can open the further opening by means of the generated heat. Thereby, the released moisture can be removed from the device and the battery directly to the outside. Thus, a (re) contact of the moisture with the battery or the battery cells, which can lead to corrosion and / or short circuits, for example, can be avoided. Since the further opening can be opened by means of the generated heat, while the opening can be closed by means of the generated heat, a switch between dehumidification and regeneration can be achieved.

Conveniently, the method may further comprise providing a further opening through which the released moisture can escape from the device, and providing a further closure element which can open the further opening by means of a resulting pressure of the released moisture. Thereby, the released moisture can be removed from the device and the battery directly to the outside. Thus, a (re) contact of the moisture with the battery or the battery cells, which can lead to corrosion and / or short circuits, for example, can be avoided. Since the further opening can be opened by means of the resulting pressure, while the opening can be closed by means of the generated heat, the further opening can be formed, for example, as a pressure-controlled valve such as an overpressure valve.

Appropriately, the further closure element can be formed temperature-actuated. As a result, the closing of the opening can be achieved particularly compact.

Conveniently, the further closure element may comprise bimetal. As a result, the further closure element can be made particularly simple and / or the opening can be closed or opened particularly reliably.

Advantageously, the method may further comprise providing a temperature-actuable drive device for driving the further closure element. As a result, the drive can be objected to by means of the generated heat from the further opening or be arranged at a shorter distance from the heating device. Thus, the generated heat can make opening the wider opening more efficient, faster and more reliable. Furthermore, the further closure element can be optimized with respect to the opening of the further opening.

Conveniently, the method may further comprise providing a temperature-actuable drive device for driving the closure element and the further closure element. As a result, the drive can be objected to by means of the generated heat from the further opening or be spaced less from the heating device. Thus, the generated heat can make opening the wider opening more efficient, faster and more reliable. Furthermore, the closure element and the further closure element can be driven by means of a single drive device. As a result, the device can be made particularly compact.

Conveniently, the temperature actuatable drive means may comprise a strain material, for example, wax for converting the generated heat into motion. As a result, the drive can be achieved particularly easily and reliably.

Conveniently, the temperature-actuated drive device may comprise a return element, for example a return spring. This can be ensured after the generation of heat switching between regeneration and dehumidification.

Conveniently, the method may further comprise providing processing means connected to the heater for controlling the desiccant regeneration. As a result, the dehumidification and regeneration or regeneration and dehumidification switching can be monitored, controlled and / or regulated. As a result, the effect of the method can be adapted, improved or optimized.

Conveniently, the processing means may turn off the heater for a predetermined dehumidification time. As a result, the dehumidification of the battery or of the housing can be effected and ensured.

Conveniently, the processing means may turn on the heater for a predetermined regeneration time. As a result, the regeneration of the desiccant can be effected and ensured. By (repeated) switching between regeneration and dehumidification, the moisture can be removed from the battery. Thus, the life of the battery can be increased.

Conveniently, the method may further comprise providing a humidity sensor connected to the processing device. Thereby, the amount of moisture absorbed by the desiccant or the saturation of the desiccant can be determined. Thus, the switch between regeneration and dehumidification can be made as needed. Thus, the amount of heat generated can be adjusted, reduced or optimized. This can reduce the amount of energy consumed and the cost. Furthermore, the life of the battery can be further increased.

Conveniently, the processing means may turn off the heater when the absorbed moisture falls below a predetermined lower limit. This can reduce the amount of heat generated. This can further reduce the amount of energy consumed and the cost. Furthermore, the life of the battery can be further increased.

Conveniently, the processing means may turn on the heater when the absorbed moisture exceeds a predetermined upper limit. As a result, the amount of desiccant can be reduced or optimized. Furthermore, the corrosion in the battery can be reduced. Thus, the life of the battery can be further increased.

Conveniently, the method may further comprise providing a housing or layer of a thermal insulating material to insulate the battery against the heat generated. As a result, the thermal load of the battery cells can be reduced. Thus, their aging can be slowed down. Consequently, the life of the battery can be further increased.

Other features and advantages of the present invention will become apparent to those skilled in the art from the following description of exemplary embodiments, which should not be construed as limiting the invention, with reference to the accompanying drawings.

1 shows a schematic side view of a battery 10 with a device 200 for drying the battery 10 according to an embodiment of the invention in a dehumidifying condition,

2 shows a schematic side view of the battery 10 with the device 200 for drying the battery 10 according to the embodiment of the invention in a regeneration state,

3 shows a schematic side view of a battery 20 with a device 200 for drying the battery 20 according to another embodiment of the invention in the dehumidifying condition, and

4 shows a schematic side view of the battery 20 with the device 200 for drying the battery 20 according to the other embodiment of the invention in the regeneration state.

1 shows a schematic side view of a battery 10 with a device 200 for drying the battery 10 according to one embodiment of the invention in a dehumidifying condition.

The electric battery 10 includes a housing (battery case) 110 and a battery cell 120 or a plurality of battery cells, for example, two, three, four or more battery cells stored in the battery case 110 is / are arranged. The battery cell may be disposed in a battery module or battery pack. The plurality of battery cells may be disposed in a battery module, a plurality of battery modules, a battery pack or a plurality of battery packs. The battery 10 Furthermore, a tempering device for temperature control, ie cooling or heating, the battery cell 120 or a plurality of battery cells and connecting lines (tubing) for supplying or discharging a temperature control.

The battery 10 further comprises a drying device 200 , The drying device 200 can be a case 210 include. The drying device 200 can from the outside into the battery case 110 can be used, for example, be screwed. The housing 210 Can in an opening of the battery case 110 be arranged. The opening may for example be oval, square, rectangular or round. As in 1 shown as an example, the (round) housing 210 , from its outside 215 , and the (round) opening of the battery case 110 , on her inside 115 , identify interlocking threaded sections so that the housing 210 in the opening of the battery case 110 can be arranged and screwed. Alternatively, the housing 210 for example, in the opening of the battery case 110 glued or clipped in (snap-in mounting). The casing 210 or the opening of the battery case 110 may have a seal. The housing 210 may include a heat-insulating material. Alternatively, the drying device 200 in a cavity or chamber of the battery case 110 be educated. The drying device 200 may further comprise a layer (not shown) of a heat-insulating material. The layer can be the case 210 or lining the cavity.

The drying device 200 includes a desiccant 260 For example, silica, molecular sieve (molecular sieve) or clay-based desiccant to absorb or temporarily bind moisture through an opening (interface, inlet port). 220 in the case 220 from the battery 10 in the drying device 200 can get. The inlet opening 220 For example, it can be oval, square, rectangular or round. The drying device 200 includes a closure element (inlet closure) 240 through which the inlet opening 220 during a regeneration of the desiccant 260 can be closed. The inlet closure 240 For example, it can be oval, square, rectangular or round. The inlet opening 220 or the inlet closure 240 may include a gasket (not shown). The desiccant 260 can, as in 1 shown by way of example, on the wall of the housing 210 be arranged so that the space along a central axis is substantially free of desiccant.

The drying device 200 further includes a heater 230 such as electric heating to generate heat for regeneration (heating and drying) of the desiccant 260 , The electric heater may be formed, for example, as a resistance wire (heating wire) or resistance foil. The heater may be disposed in the space along the central axis. Alternatively, the heater 230 the desiccant 260 penetrate.

The drying device 200 includes another opening (further interface, outlet opening) 225 in the case 220 , by which the moisture released by means of the generated heat from the drying device 200 can get outside, and another closure element (outlet closure) 245 through which the outlet opening 225 during dehumidification of the battery 10 can be closed. The outlet opening 225 For example, it can be oval, square, rectangular or round. The outlet opening 225 can, as in 1 exemplified, opposite the inlet opening 220 be arranged. The outlet closure 245 For example, it can be oval, square, rectangular or round. The outlet opening 225 or the outlet closure 245 may include a gasket (not shown).

In the 1 shown drying device 200 further comprises a drive device 250 for driving the inlet shutter 240 and the outlet closure 245 , Because the inlet opening 220 and the outlet opening 225 , as in 1 shown by way of example opposite each other, is the drive device 250 between them and also the heater 230 arranged in the space along the central axis. The drive device 250 is by means of the heater 230 thermally driven or moved. The drive device 250 can be a case 252 , a stretch material (expansion material) 256 like wax and a piston (expansion element) 253 include and with that of the heater 230 generated heat to be operated. The drive device 250 can continue a return spring 258 include. The inlet closure 240 and the outlet closure 245 are on opposite sides of the piston 253 medium of a rod (axle) 254 or two partial rods attached.

When the heater 230 during dehumidification, as in 1 is turned off, the outlet closure closes 245 the outlet opening 225 so that no moisture can penetrate from the outside while the inlet closure 240 the inlet opening 220 releases so that the desiccant 250 the moisture from the battery 10 can record.

The drying device 200 may further include a processing device 300 and / or a sensor such as a humidity sensor 270 or temperature sensor. The processing device 300 can by means of a line 330 with the heater 230 and / or by means of a line 335 with the humidity sensor 270 be connected. The processing device 300 for example, a processor 310 and a memory 320 For example, data may process measurements such as humidity readings and / or temperature readings of the drying device and control the heater so that, depending on the current situation, the battery 10 dehumidifies or the desiccant 230 is regenerated.

For this purpose, the processing device 300 , For example, at regular or adjustable intervals, the heater 230 for a predetermined dehumidification time or turn on the heater for a predetermined regeneration time. Alternatively or additionally, the processing device 300 the heater 230 turn off when the recorded Moisture falls below a predetermined lower limit or the heater 230 turn on when the absorbed humidity exceeds a predetermined upper limit.

2 shows a schematic side view of the battery 10 with the device 200 for drying the battery 10 according to the embodiment of the invention in a regeneration state.

When the heater 230 during regeneration, as in 2 As heat is generated, the expansion expands due to the heat generated and forces the piston 253 towards the inlet opening 220 , This closes the inlet closure 240 the inlet opening 220 , so no moisture in the battery 10 can penetrate while the outlet closure 245 the outlet opening 225 releases so that the released moisture can escape to the outside.

3 shows a schematic side view of a battery 20 with a device 200 for drying the battery 20 according to another embodiment of the invention in the dehumidifying state.

The battery 20 corresponds to with respect to 1 and 2 described battery 10 , The device 200 is essentially the same as with reference to 1 and 2 described device 200 ,

The inlet closure 240 and the outlet closure 245 include bimetal, which may deform or bend along an axis, for example. The inlet closure 240 and the outlet closure 245 can, as in 3 exemplified at the ends of the heater 230 be arranged. Alternatively, they may be at the ends of a Wärmeleiteinrichung that of the heater 230 is surrounded, be arranged. The heat conducting device may be formed, for example, as a metal rod such as copper rod.

The inlet closure 240 is how in 3 shown bent at normal temperature (ambient temperature), leaving the inlet opening 220 is open during dehumidification and thus the desiccant 250 the moisture from the battery 20 and heats when heated while the outlet closure 245 stretched at the normal temperature (ambient temperature), leaving the outlet opening 225 is closed during dehumidification and thus no moisture can penetrate from the outside, and bends when heated.

4 shows a schematic side view of the battery 20 with the device 200 for drying the battery 20 according to the other embodiment of the invention in the regeneration state.

The inlet closure 240 is how in 4 shown to be stretched at elevated temperature due to the heat generated, leaving the inlet opening 220 during the regeneration is closed and thus no moisture in the battery 20 can penetrate while the outlet closure 245 bent at the elevated temperature, leaving the outlet opening 225 is open during regeneration and thus the released moisture can escape to the outside.

Finally, it is noted that terms such as "comprising" and "having" or the like do not preclude that further elements or steps may be provided. It should also be noted that "a" or "an" does not exclude a multitude. In addition, the features described in connection with the various embodiments may be combined with each other as desired. Finally, it is noted that the reference signs in the claims should not be construed as limiting the scope of the claims.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102010028861 A1 [0012]

Claims (25)

Contraption ( 200 ) for drying a battery ( 10 ; 20 ), characterized by: - a heating device ( 230 ) for generating heat for the regeneration of a desiccant ( 260 ), the moisture from the battery ( 10 ; 20 ) by release of the absorbed moisture, - an opening ( 220 ), through which the moisture from the battery ( 10 ; 20 ) to the desiccant ( 260 ), and - a closure element ( 240 ), the opening ( 220 ) can close by means of the generated heat. The device ( 200 ) according to claim 1, wherein: - the closure element ( 240 ) is temperature-actuated, - the closure element ( 240 ) Comprises bimetal, or - the device ( 200 ) furthermore a temperature-actuable drive device ( 250 ) for driving the closure element ( 240 ). The device ( 200 ) according to claim 1 or 2, further comprising: - another opening ( 225 ), through which the released moisture from the device ( 200 ), and - another closure element ( 245 ), the further opening ( 225 ) can open by means of the generated heat or an emerging pressure of the released moisture. The device ( 200 ) according to claim 3, wherein: - the further closure element ( 245 ) is temperature-actuated, - the further closure element ( 245 ) Comprises bimetal, or - the device ( 200 ) furthermore a temperature-actuable drive device ( 250 ) for driving the further closure element ( 245 ). The device ( 200 ) according to claim 1 and 3, further comprising: - a temperature-actuable drive device ( 250 ) for driving the closure element ( 240 ) and the further closure element ( 245 ). The device ( 200 ) according to claim 2, 4 or 5, wherein: - the temperature-actuable drive means ( 250 ) a strain material ( 256 ) or wax for converting the heat generated in motion, or - the temperature-operated drive means ( 250 ) a return element or a return spring ( 258 ). The device ( 200 ) according to one of claims 1 to 6, further comprising: - a processing device ( 300 ) connected to the heater ( 230 ) for controlling the regeneration of the desiccant ( 260 ). The device ( 200 ) according to claim 7, wherein: - the processing device ( 300 ) the heating device ( 230 ) can switch off for a predetermined dehumidification time, or - the processing device ( 300 ) the heating device ( 230 ) can turn on for a predetermined regeneration time. The device ( 200 ) according to claim 7 or 8, further comprising: - a humidity sensor ( 270 ) connected to the processing device ( 300 ) connected is. The device ( 200 ) according to claim 9, wherein: - the processing device ( 300 ) the heating device ( 230 ) can turn off when the absorbed moisture falls below a predetermined lower limit, or - the processing device ( 300 ) the heating device ( 230 ) can turn on when the absorbed moisture exceeds a predetermined upper limit. The device ( 200 ) according to one of claims 1 to 10, further comprising: - a housing ( 210 ) or a layer of a thermally insulating material for the isolation of the battery ( 10 ; 20 ) against the generated heat. Battery ( 10 ; 20 ), comprising: - the device ( 200 ) according to one of claims 1 to 11. Battery system comprising: - the device ( 200 ) according to one of claims 1 to 11, or - the battery ( 10 ; 20 ) according to claim 12. Vehicle, motor vehicle, electric motor vehicle or hybrid vehicle, comprising: - the device ( 200 ) according to one of claims 1 to 11 connected to the vehicle, - the battery ( 10 ; 20 ) according to claim 12 connected to the vehicle, or - the battery system according to claim 13 connected to the vehicle. Method for drying a battery ( 10 ; 20 ), characterized by: - providing a heating device ( 230 ) for generating heat for the regeneration of a desiccant ( 260 ), the moisture from the battery ( 10 ; 20 ) by release of the absorbed moisture, - providing an opening ( 220 ), through which the moisture from the battery ( 10 ; 20 ) to the desiccant ( 260 ), and - providing a closure element ( 240 ), the opening ( 220 ) can close by means of the generated heat. The method of claim 15, wherein: - the closure element ( 240 ) is formed temperature-actuated, - the closure element ( 240 ) Comprises bimetal, or - the method further provides a temperature-actuable drive device ( 250 ) for driving the closure element ( 240 ). The method of claim 15 or 16, further comprising: providing a further opening ( 225 ), through which the released moisture from the device ( 200 ), and - providing a further closure element ( 245 ), the further opening ( 225 ) can open by means of the generated heat or an emerging pressure of the released moisture. The method of claim 17, wherein: - the further closure element ( 245 ) is formed temperature-actuated, - the further closure element ( 245 ) Comprises bimetal, or - the method further provides a temperature-actuable drive device ( 250 ) for driving the further closure element ( 245 ). The method according to claims 15 and 17, further comprising: providing a temperature-actuable drive device ( 250 ) for driving the closure element ( 240 ) and the further closure element ( 245 ). The method of claim 16, 18 or 19, wherein: - the temperature actuatable drive means ( 250 ) a strain material ( 256 ) or wax for converting the heat generated in motion, or - the temperature-operated drive means ( 250 ) a return element or a return spring ( 258 ). The method of any of claims 15 to 20, further comprising: providing a processing device ( 300 ) connected to the heater ( 230 ) for controlling the regeneration of the desiccant ( 260 ). The method of claim 21, wherein: - the processing device ( 300 ) the heating device ( 230 ) can switch off for a predetermined dehumidification time, or - the processing device ( 300 ) the heating device ( 230 ) can turn on for a predetermined regeneration time. The method of claim 21 or 22, further comprising: providing a humidity sensor ( 270 ) connected to the processing device ( 300 ) is connected. The method of claim 3, wherein: - the processing device ( 300 ) the heating device ( 230 ) can turn off when the absorbed moisture falls below a predetermined lower limit, or - the processing device ( 300 ) the heating device ( 230 ) can turn on when the absorbed moisture exceeds a predetermined upper limit. The method of any of claims 15 to 24, further comprising: providing a housing ( 210 ) or a layer of a heat-insulating material for the isolation of the battery ( 10 ; 20 ) against the generated heat.

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