Medical device with improved battery storage

Abstract

The medical device (1) has a battery store by means of which continuous operation of the medical device and / or emergency operation of the medical device is enabled. The battery store has a plurality of battery modules which are arranged in a module receptacle of the medical device. The power coupling of the battery modules to each other is determined by the arrangement of the battery modules in the module receptacles. The module accommodating part is divided into a plurality of basic accommodating parts and at least one additional accommodating part. The battery storage is associated with a compensation device. The compensation device can bring about a low-loss equalization of the basic state of charge and the additional state of charge between battery modules which are arranged in the basic receptacle on the one hand and have a uniform basic state of charge and battery modules which are arranged in the additional receptacle on the other hand and have an additional state of charge. And the compensation device cannot cause a uniform basic state of charge in the battery module arranged in the basic accommodating part.

Description

Technical Field

[0001] The present invention is based on a medical device,

[0002] wherein the device comprises a battery storage device, by means of which a continuous operation of the medical device and / or an emergency operation of the medical device is supported and / or enabled,

[0003] - wherein the battery storage has a plurality of battery modules,

[0004] wherein the battery module is arranged in a module receptacle of the medical device,

[0005] The power coupling of the battery modules to one another is determined by the arrangement of the battery modules in the module receptacles. Background Art

[0006] Such medical devices are generally known.

[0007] A typical example of such medical equipment is an X-ray system. While such systems are typically powered by the power grid, they have significantly fluctuating power consumption during continuous operation. Therefore, during periods of high power consumption (power phases), a battery storage device can supply energy to the medical device, while during periods of low power consumption (power pauses), energy is again supplied from the power grid to the battery storage device. This allows for a more even power draw from the grid and reduces, if necessary, even significantly, the maximum power draw from the grid. In some cases, network-independent, autonomous operation is also possible with mobile medical devices. Therefore, depending on the situation, a battery storage device may be necessary for continuous operation of the medical device. Only if the battery storage device is necessary does it enable continuous operation of the medical device. If it is not necessary, the battery storage device supports continuous operation, for example by reducing the maximum power draw from the grid. Alternatively, or in addition, the battery storage device can enable continuous operation or emergency operation of the medical device for a limited period of time in the event of a power grid failure. The extent to which continuous operation or emergency operation is enabled is determined by the energy requirements of the medical device and the design of the energy storage device.

[0008] In the prior art, battery storage systems typically consist of multiple battery modules, which are connected in parallel or series as needed to meet the requirements of the respective system. The individual battery modules are typically designed so that they can be legally operated even by unqualified service technicians. This allows these personnel to replace modules.

[0009] When a battery storage system is first installed, the battery modules generally all have the same state of charge. Furthermore, during subsequent operation, all modules generally have the same state of charge. However, the state of charge can be anywhere between a minimum and a maximum value—in extreme cases, between 0% (= fully discharged) and 100% (= fully charged).

[0010] If a single battery module fails or otherwise no longer meets the required specifications, the entire battery storage unit is sometimes replaced or removed. This is disadvantageous, as the other battery modules often still function as intended. This results in excessive costs and unnecessarily consumes resources.

[0011] It is known from the outset and easily conceivable that only a single battery module is replaced. However, this presents the following problem: a newly installed battery module may have a different state of charge than the battery modules already in the device. For example, due to applicable hazardous materials regulations, newly produced battery modules are typically stored and shipped with a maximum state of charge of approximately 30%. In contrast, the state of charge of battery modules already in the device may have different values, sometimes even significantly different values. However, to fully operate the medical device, all battery modules must (at least substantially) have the same state of charge.

[0012] Passive balancing circuits are known in the prior art. Such balancing circuits are used within battery modules to equalize the states of charge (SOCs) of the individual battery cells within the modules. It is conceivable that such passive balancing circuits could also be used to compensate for the SOCs of battery modules. However, this approach presents disadvantages. For one thing, equalizing the SOCs in this manner takes a long time, typically several hours. Furthermore, in passive balancing circuits, SOCs are equalized by equalizing charge differences through currents flowing through resistors, which converts energy into heat and results in losses.

[0013] Active balancing circuits are also known in the prior art. They are also used in the prior art to equalize the states of charge. It is conceivable that such active balancing circuits could also be used to compensate for the states of charge of battery modules. However, due to the relatively large number of battery modules, a high number of active balancing circuits would be required. Therefore, this solution is not adopted for cost reasons. Summary of the Invention

[0014] The object of the present invention is to provide a possibility by which, even when replacing individual battery modules, the state of charge of said battery module can be easily and cost-effectively equalized with the state of charge of other battery modules with low losses.

[0015] This object is achieved by the medical device according to the invention. Advantageous embodiments of the medical device are described below.

[0016] According to the invention, a medical device of the type mentioned at the outset is designed as follows:

[0017] - the module receptacle is divided into a plurality of basic receptacles and at least one additional receptacle,

[0018] -Battery storage is associated with a compensation device,

[0019] the compensating device is capable of achieving low-loss equalization of the basic state of charge and the additional state of charge between, on the one hand, the battery modules arranged in the basic receptacle and having a uniform basic state of charge and, on the other hand, the battery modules arranged in the additional receptacle and having an additional state of charge,

[0020] However, the compensation device is not able to bring about a uniform basic state of charge within the battery modules arranged in the basic receptacle.

[0021] The modular design of the battery storage simplifies the replacement of battery modules. The division of the module receptacle into a basic receptacle and, in theory, at least one, and usually precisely one, additional receptacle in practice, allows the new battery module to be introduced into the battery module assembly at a defined location. The compensation device ensures that the states of charge are balanced with each other in a low-loss manner. Because it is known which module receptacle the new battery module will be placed in (i.e., the additional receptacle) and the new battery module is the only one whose state of charge can differ from the standard state of charge of the other battery modules, the design of the compensation device is very simple. This is because the design of the compensation device does not need to account for the possibility that the new battery module could be placed in any module receptacle of the medical device.

[0022] For example, it is possible that the battery modules arranged in the module receptacle are connected in terms of data to the battery management system of the medical device, so that the battery modules arranged in the module receptacle can transmit their corresponding state of charge to the battery management system, and the basic receptacle is associated with a basic charging device that covers the basic receptacle, with the help of which the unified basic state of charge of the battery modules arranged in the additional receptacle can be changed without affecting the additional state of charge of the battery modules arranged in the additional receptacle.

[0023] In the described case, the battery management system that is usually already present can identify or query the charge state of the battery module arranged in the module receptacle via communication with the battery module arranged in the module receptacle, and if necessary, can bring the unified basic charge state of the battery module arranged in the basic receptacle closer to the additional charge state of the battery module arranged in the additional receptacle.

[0024] In this context, it is particularly preferred that, during ongoing operation of the medical device, the battery modules arranged in the basic receptacle are discharged or electrical energy is supplied to the battery modules arranged in the basic receptacle in the same manner and method as when no battery modules are arranged in the additional receptacle in order to adapt the uniform basic state of charge of the battery modules arranged in the basic receptacle to the additional state of charge of the battery modules arranged in the additional receptacle. This is because the adaptation then takes place completely automatically without any further special measures. Only the additional state of charge must be known. Which of the two measures—discharging the battery modules arranged in the basic receptacle or supplying electrical energy to the battery modules arranged in the basic receptacle—is taken depends on whether the additional state of charge is greater than or less than the basic state of charge.

[0025] Emergency operation occurs when the external energy supply to the medical device fails. Therefore, the battery modules cannot be charged during emergency operation of the medical device. However, if the battery modules arranged in the basic receptacle need to be discharged in order to match the uniform basic state of charge of the battery modules arranged in the basic receptacle to the additional state of charge of the battery modules arranged in the additional receptacle, discharging is performed in the same manner and method as when no battery modules are arranged in the additional receptacle.

[0026] This approach is particularly advantageous if the battery module arranged in the additional receptacle is not involved in the continuous operation or emergency operation of the medical device.

[0027] Alternatively or additionally to the basic charging device, it is possible that the additional receptacle is exclusively associated with an additional charging device, by means of which the additional state of charge of the battery modules arranged in the additional receptacle can be changed without affecting the uniform basic state of charge of the battery modules arranged in the basic receptacle. In this case, the battery management system can also—alternatively or additionally to bringing the uniform basic state of charge of the battery modules arranged in the basic receptacle closer to the additional state of charge of the battery modules arranged in the additional receptacle—bring the additional state of charge of the battery modules arranged in the additional receptacle closer to the uniform basic state of charge of the battery modules arranged in the basic receptacle.

[0028] The latter approach can be used when a battery module arranged in an additional receptacle is or is not integrated into the continuous operation or emergency operation of the medical device. Only the actual charging capability of the relevant battery module is required.

[0029] Another possibility is that the battery storage is associated with an active balancing circuit, by means of which charge can be transferred with low loss between the battery module as a whole arranged in the basic receptacle on the one hand and the battery module arranged in the additional receptacle on the other hand, and the change in the additional state of charge of the battery module arranged in the additional receptacle is evenly distributed to the battery modules arranged in the basic receptacle.

[0030] In this case, the unified basic state of charge and the additional state of charge are matched to each other solely by means of an active balancing circuit, without the assistance of a battery management system. The active balancing circuit is designed to accordingly account for the existing "imbalance" ("many-to-one") between the plurality of battery modules arranged in the basic receptacle and the individual battery modules arranged in the additional receptacle. For example, a correspondingly higher voltage can be accommodated when the battery modules arranged in the basic receptacle are connected in series.

[0031] As already mentioned, it is alternatively possible for the battery module arranged in the additional receptacle to be integrated or not integrated into the continuous operation or emergency operation of the medical device. If the battery module is not integrated, then during continuous operation and / or emergency operation of the medical device, electrical energy is drawn from the battery module arranged in the main receptacle, but not from the battery module arranged in the additional receptacle, for operating the medical device. If the battery module is integrated, then during continuous operation and / or emergency operation of the medical device, electrical energy is drawn from both the battery module arranged in the main receptacle and the battery module arranged in the additional receptacle, for operating the medical device.

[0032] It is even possible to associate a switching device with the battery storage device, which can be used to dynamically set whether, during continuous operation and / or emergency operation of the medical device, electrical energy is drawn solely from the battery modules located in the main receptacle, or not only from the battery modules located in the main receptacle but also from the battery modules located in the additional receptacle, for operating the medical device. In this case, the states of charge can be equalized without the battery modules located in the additional receptacle being integrated into continuous or emergency operation of the medical device. After the states of charge have been equalized, the battery modules located in the additional receptacle can then be integrated into continuous or emergency operation of the medical device by actuating the switching device.

[0033] Preferably, the battery storage is designed so that as long as the number of basic receptacles without battery modules or the number of basic receptacles in which battery modules are bridged does not exceed a limit number greater than 0, the battery storage supports and / or enables continuous operation of the medical device and / or enables emergency operation of the medical device.

[0034] This makes it possible, for example, to maintain continuous operation or emergency operation of the medical device even when, for example, one of the battery modules arranged in the basic receptacle fails and has to be bridged. At the time of the aforementioned battery module failure, for example, no battery module may yet be arranged in the additional receptacle. Nevertheless, it is possible to continue continuous operation or emergency operation. The battery module can be inserted into the additional receptacle at a later point in time and the state of charge can be equalized. When the basic state of charge and the additional state of charge are equalized, the battery module arranged in the additional receptacle is usually not integrated into the continuous operation or emergency operation of the medical device. However, continuous operation or emergency operation of the medical device can also be maintained during the time period. After the state of charge has been equalized, the battery module arranged in the additional receptacle can be either removed from the additional receptacle and inserted into a free basic receptacle, or integrated into the battery module complex while maintaining its arrangement in the additional receptacle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The characteristics, features, and advantages of the present invention described above, as well as the manner and method of achieving these characteristics, features, and advantages, will become clearer and easier to understand with reference to the following description of an embodiment, which is explained in detail with reference to the accompanying drawings. Here, the following is a schematic diagram showing:

[0036] Figure 1 A medical device is shown,

[0037] Figure 2 A battery storage device is shown.

[0038] Figure 3 A battery storage device and a compensation device are shown.

[0039] Figure 4 A battery storage device and a compensation device are shown.

[0040] Figure 5 A battery storage device and a compensation device are shown, and

[0041] Figure 6 A battery storage device is shown. DETAILED DESCRIPTION

[0042] according to Figure 1 , a (in principle any) medical device 1 is operated electrically. The medical device 1 therefore has a certain number of electrical loads 2. The medical device 1 is usually supplied with electrical energy from a power supply network 4 via an input stage 3. Figure 1, there is an intermediate circuit 5, to which the input stage 3 and the output stage 6 are connected, and via which the load 2 is supplied with electrical energy. A design with an intermediate circuit 5 is common, but not mandatory. The medical device 1 can be designed as an X-ray device, for example.

[0043] The medical device 1 also has a battery storage device 7. The battery storage device 7 supports and / or enables continuous operation of the medical device 1 (i.e., operation while powered by the power supply network 4). Alternatively or additionally, the battery storage device 7 can also enable emergency operation of the medical device 1 (i.e., operation without power supply via the power supply network 4). The battery storage device 7 can be connected to the intermediate circuit 5, for example, via a converter circuit 8.

[0044] according to Figure 2 , the battery storage 7 has a plurality of battery modules 9, 9'. Figure 2 In the figures and other drawings, five battery modules 9, 9' are always shown. However, the number of battery modules 9, 9' can also be greater or lesser. However, there are at least three battery modules 9, 9'.

[0045] The battery modules 9, 9' are arranged in module receptacles 10, 10'. The module receptacles 10, 10' serve at least to mechanically accommodate the battery modules 9, 9'. If necessary, the module receptacles may also allow the battery modules 9, 9' to be electrically integrated into the medical device 1. Regardless of whether the module receptacles 10, 10' also allow the battery modules 9, 9' to be electrically integrated into the medical device 1 or whether this is done independently (e.g., via a cable with a preassembled plug at its end), the power connection between the battery modules 9, 9' is determined by the arrangement of the battery modules 9, 9' in the module receptacles 10, 10'.

[0046] The module receptacles 10, 10' include a plurality of module receptacles 10 of the same type, hereinafter referred to as basic receptacles 10. The battery modules 9 disposed in the basic receptacles 10 are hereinafter referred to as basic modules 9. Furthermore, the module receptacles 10, 10' include at least one additional module receptacle 10', hereinafter referred to as additional receptacle 10'. The battery modules 9' disposed in the additional receptacles 10' are hereinafter referred to as additional modules 9'.

[0047] In the following it is assumed that there is only a single additional receptacle 10 ′, although a plurality of additional receptacles 10 ′ may be present. Since a total of five battery modules 9 , 9 ′ is assumed in the present case—although also only by way of example—there are four basic receptacles 10 .

[0048] The battery modules 9 , 9 ′ each have a state of charge L, L′. The respective states of charge L, L′ can vary between 0 (=completely discharged) and 1 (=completely charged). The state of charge L of the base module 9 is uniform and is hereinafter referred to as the basic state of charge L. The state of charge L′ of the additional module 9 ′—hereinafter referred to as the additional state of charge L′—is independent of the basic state of charge L. This means that the additional state of charge can have the same value, but can also have a different value than the basic state of charge L.

[0049] The battery storage device 7 is associated with a compensation device 11. The compensation device 11 can bring about a low-loss equalization of the basic state of charge L and the additional state of charge L' between the basic module 9 on the one hand and the additional module 9' on the other hand. In other words, the compensation device 11 can ensure that, after equalization, the basic state of charge and the additional state of charge L' have the same value, i.e., a uniform state of charge L' for all battery modules 9, 9'. However, the compensation device 11 is also limited to this functionality. In particular, the compensation device cannot bring about a uniform basic state of charge L, L' within a plurality of basic modules 9 or within a single basic module 9 or also within a single additional module 9'. Rather, the uniform basic state of charge must be given from the outset. Possible design options for the compensation device 11 are explained below in conjunction with other figures.

[0050] according to Figure 3 The compensation device 11 comprises a battery management system 12 of the medical device 1. Such a battery management system 12 is conventional and does not need to be explained in detail. Figure 3 The battery modules 9 , 9 ′ are connected to the battery management system 12 in terms of data via a communication connection 13 , typically a serial bus.

[0051] exist Figure 3 In the simplest case (not shown), the additional module 10' is not connected at all in terms of power, but is connected to the battery management system 12 only in terms of data via the communication connection 13. In this case, the charging and discharging of the battery storage device 7 essentially only affects the basic module 9. In this case, the basic state of charge L and the additional state of charge L' are equalized solely by the charging and discharging of the basic module 9. In this case, the compensation device 11 includes a basic charging device 14. The battery management system 12 determines the actuation for the basic charging device 14 by first determining a desired value for the basic state of charge L based on the additional state of charge L' and then determining the actuation based on the deviation of the basic state of charge L from the desired value for the basic state of charge.

[0052] For this purpose, the basic receptacle 10 can be associated with a basic charging device 14 that encompasses the basic receptacle 10 and by means of which the unified basic state of charge L can be changed. Since no additional module 9 ′ is connected in terms of power, the change in the unified basic state of charge L occurs without affecting the additional state of charge L′. The basic charging device 14 can, for example, be identical to the converter circuit 8 , via which energy is exchanged with the intermediate circuit 5 .

[0053] During normal operation of the medical device 1, i.e., when electrical energy is available via the input stage 3 and the power supply network 4, the battery storage device 7 can be operated in principle in the same manner and method as when the additional module 9' is not present, i.e., when the additional module 9' is not arranged in the additional receptacle 10', in order to achieve a uniform basic state of charge L and an equilibrium with the additional state of charge L'. In this case, the battery management system 12 only ensures the necessary adjustment of the basic state of charge L. In other words, if the basic state of charge L is less than the additional state of charge L', the energy drawn from the battery storage device 7 is only slightly reduced and / or the energy supplied to the battery storage device 7 is only slightly increased until the basic state of charge L and the additional state of charge L' are balanced. If, on the other hand, the basic state of charge L is greater than the additional state of charge L', the energy drawn from the battery storage device 7 is only slightly increased and / or the energy supplied to the battery storage device 7 is only slightly reduced until the basic state of charge L and the additional state of charge L' are balanced.

[0054] In emergency operation of medical device 1, ie when power supply via input stage 3 and supply network 4 is not possible, all power must be drawn from battery storage 7 to maintain emergency operation. However, in this case, discharging of basic module 9 can also be handled in a similar manner.

[0055] according to Figure 3 In the illustration, the compensation device 11 includes an additional charging device 15 that is specifically associated with the additional receptacle 10 ′. The additional state of charge L′ of the additional module 9 ′ can be changed using the additional charging device 15. The additional charging device 15 acts only on the additional module 9 ′. This means that the additional module 9 can be charged and discharged without affecting the uniform state of charge L of the base module 9 .

[0056] It is possible that the basic state of charge L and the additional state of charge L' are adjusted to one another solely by charging and discharging the additional module 9'. In this case, the battery management system 12 determines the actuation for the additional charger 15 by first determining a desired value for the additional state of charge L' as a function of the basic state of charge L and then ascertaining the actuation as a function of the deviation of the additional state of charge L' from the desired value for the additional state of charge L'.

[0057] However, it is also possible to have an additional charging device 15 in addition to the basic charging device 14. In this case, the states of charge L and L' can be changed in opposite directions to equalize the basic state of charge L and the additional state of charge L'. In this case, the two approaches mentioned above are combined.

[0058] Figure 4 Shown relative to Figure 3 An alternative to the design of Figure 4 The module receiving parts 10, 10' are not shown in FIG. Figure 4 , an active balancing circuit 16 is associated with the battery storage device 7. This active balancing circuit 16 enables low-loss charge transfer between the basic module 9 as a whole, on the one hand, and the additional module 9', on the other. This distributes the change in the additional state of charge L' evenly across the basic modules 9. This means, for example, that if the additional state of charge L' increases by x, the basic state of charge L of the basic modules 9 decreases correspondingly and evenly by y. A decrease in the basic state of charge L of an individual basic module 9 results in an increase in the additional state of charge L' by x / 4. In this case, "4" is obtained because four basic modules 9 are assumed.

[0059] Figure 3 The following embodiment is shown: in which the additional module 9' is not integrated into the operation of the basic module 9 in terms of power. Figure 4 If the additional module 9' is not integrated into the operation of the basic module 9 in terms of power, then during the continuous operation and / or emergency operation of the medical device 1, although electrical energy is drawn from the basic module 9 for operating the medical device 1, no electrical energy is drawn from the additional module 9'. However, it is also possible that during the continuous operation and / or emergency operation of the medical device 1, electrical energy is drawn not only from the basic module 9 but also from the additional module 9' for operating the medical device 1. In particular, this is combined with the Figure 4 The design of is feasible, because the active balancing circuit 16 can also compensate the charge states L, L' during the continuous operation of the battery storage 7. However, it is also possible to modify Figure 3 .

[0060] It is even possible to dynamically integrate the additional module 9' into the operation of the basic module 9 in terms of power or not as required. Possible designs for this are described below in conjunction with Figure 5 Explain.

[0061] according to Figure 5 The battery storage device 7 is associated with a switching device 17. The switching device 17 includes at least a switch 18 and one of two switches 19, and preferably includes the switch 18 and both switches 19. Switches 18 and 19 are preferably electronic switches (e.g., IGBTs or MOSFETs) that can switch quickly so as not to disrupt the operation of the medical device 1. The switching time of switches 18 and 19 can be in the millisecond range, or even in the μs or nanosecond range, as required. In some cases, it is also possible to configure switches 18 and 19 as electromechanical switches or even as manually operated switches (e.g., a manually pluggable switching bridge).

[0062] In many cases, the switching device 17 can be controlled by the battery management system 12. Switches 18 and 19 are switched in a push-pull manner by the battery management system 12. If switch 18 is closed, then switch 19 or switches 19 are open. In this state, the additional module 9' is not integrated into the operation of the basic module 9 in terms of power. Conversely, if switch 18 is open, then switch 19 or switches 19 are closed. In this state, the additional module 9' is not integrated into the operation of the basic module 9 in terms of power.

[0063] Thus, it is easy to dynamically set whether, during continuous operation and / or emergency operation of the medical device 1, electrical energy is drawn solely from the basic module 9 or not only from the basic module 9 but also from the additional modules 9′ for operating the medical device 1. The reverse is also possible, i.e., during continuous operation of the medical device 1, it is dynamically set whether electrical energy is supplied solely to the basic module 9 or not only to the basic module 9 but also to the additional modules 9′.

[0064] exist Figure 5 The module receptacles 10 , 10 ′ are also not shown.

[0065] Preferably, the battery storage device 7 is designed so that if the number of basic receptacles 10 in which no battery modules 9 are provided or the number of basic receptacles 10 in which battery modules 9 are bridged does not exceed a limit number, the battery storage device 7 also supports and / or enables continuous operation of the medical device 1 and / or enables emergency operation of the medical device 1. The limit number may be, for example, 1 or 2. For example, Figure 6A design of a battery storage device 7 is shown, in which one of the basic modules 9 is bridged by means of a switching bridge 20. The basic module 9 is decoupled from the power complex of the battery modules 9, 9'. The switching bridge 20 functions similarly to the switching device 17. That is, it does not short-circuit the corresponding basic module 9. The switching bridge 20 can be manually actuated (e.g., plugged in) by an operator (not shown). However, in individual cases, the switching bridge can also be designed as an electromechanical or electronic switch.

[0066] It is feasible that according to Figure 6 , if one (or more) basic modules 9 are not present or are bridged, the battery storage device 7 is only operable if the additional module 9 ′ is present and integrated into the power complex of the remaining basic modules 9. However, it is also possible to operate the battery storage device 7 even when the additional module 9 ′ is not present or is not integrated into the power complex of the remaining basic modules 9.

[0067] The present invention offers numerous advantages. In particular, it allows for the energy-efficient integration of additional battery modules 9' with any desired state of charge L' into a battery storage device 7 that already has multiple battery modules 9 with a uniform state of charge L in a simple and cost-effective manner. It also allows for the replacement of a single battery module 9, 9', meaning that the entire battery storage device 7 does not have to be replaced. Compared to conventional methods, the time required to perform charge compensation is significantly reduced.

[0068] Regardless of the grammatical gender of a particular term, persons with both male and female gender identities are included.

Claims

1. A medical device, - the device comprises a battery storage device (7), by means of which a continuous operation of the medical device and / or an emergency operation of the medical device is supported and / or enabled, - wherein the battery storage (7) has a plurality of battery modules (9, 9'), - wherein the battery module (9, 9') is arranged in a module receptacle (10, 10') of the medical device, - wherein the power coupling of the battery modules (9, 9') to one another is determined by the arrangement of the battery modules (9, 9') in the module receptacles (10, 10'), It is characterized by: - the module housing (10, 10') is divided into a plurality of basic housings (10) and at least one additional housing (10'), - a compensation device (11) is associated with the battery storage (7), - the compensation device (11) is capable of bringing about low-loss equalization of the basic state of charge (L) and the additional state of charge (L') between the battery modules (9) arranged in the basic receptacle (10) and having a uniform basic state of charge (L) on the one hand and the battery modules (9') arranged in the additional receptacle (10') and having an additional state of charge (L') on the other hand, - However, the compensation device (11) is not able to bring about a uniform basic state of charge (L) within the battery module (9) arranged in the basic receptacle (10).

2. The device according to claim 1, It is characterized by: The battery modules (9, 9') arranged in the module receptacles (10, 10') are connected in terms of data to a battery management system (12) of the medical device, so that the battery modules (9, 9') arranged in the module receptacles (10, 10') can transmit their respective states of charge (L, L') to the battery management system (12), and the basic receptacle (10) is associated with a basic charging device (14) covering the basic receptacle (10), by means of which the unified basic state of charge (L) of the battery modules (9) arranged in the basic receptacle (10) can be changed without affecting the additional state of charge (L') of the battery modules (9') arranged in the additional receptacle (10').

3. The device according to claim 2, It is characterized by: In the continuous operation of the medical device, in order to match the uniform basic state of charge (L) of the battery modules (9) arranged in the basic receptacle (10) to the supplementary state of charge (L') of the battery modules (9') arranged in the additional receptacle (10'), the battery modules (9) arranged in the basic receptacle (10) are discharged or electrical energy is supplied to the battery modules (9) arranged in the basic receptacle (10) in the same manner and method as when no battery modules (9') are arranged in the additional receptacle (10'); and in the emergency operation of the medical device, when it is necessary to discharge the battery modules (9) arranged in the basic receptacle (10) in order to match the uniform basic state of charge (L) of the battery modules (9) arranged in the basic receptacle (10) to the supplementary state of charge (L') of the battery modules (9') arranged in the additional receptacle (10'), the discharging is performed in the same manner and method as when no battery modules (9') are arranged in the additional receptacle (10').

4. The device according to claim 2 or 3, It is characterized by: The additional receptacle (10') is exclusively associated with an additional charging device (15), by means of which an additional state of charge (L') of a battery module (9') arranged in the additional receptacle (10') can be changed without affecting the uniform basic state of charge (L) of the battery module (9) arranged in the basic receptacle (10).

5. The device according to claim 1, It is characterized by: The battery modules (9, 9') arranged in the module receptacle (10, 10') are connected in terms of data to a battery management system (12) of the medical device, so that the battery modules (9, 9') arranged in the module receptacle (10, 10') can transmit their respective states of charge (L, L') to the battery management system (12), and the additional receptacle (10') is exclusively associated with an additional charging device (15), by means of which the additional state of charge (L') of the battery modules (9') arranged in the additional receptacle (10') can be changed without affecting the uniform basic state of charge (L) of the battery modules (9) arranged in the basic receptacle (10).

6. The device according to claim 1, It is characterized by: The battery storage (7) is associated with an active balancing circuit (16), by means of which a low-loss charge can be transferred between the entire battery module (9) arranged in the basic receptacle (10) on the one hand and the battery module (9') arranged in the additional receptacle (10') on the other hand, and a change in the additional state of charge (L') of the battery module (9') arranged in the additional receptacle (10') is evenly distributed to the battery module (9) arranged in the basic receptacle (10).

7. The apparatus according to any one of claims 1 to 6, It is characterized by: During continuous operation and / or emergency operation of the medical device, electrical energy is drawn from the battery module (9) arranged in the basic receptacle (10) for operating the medical device, but electrical energy is not drawn from the battery module (9') arranged in the additional receptacle (10').

8. The apparatus according to any one of claims 1 to 6, It is characterized by: During continuous operation and / or emergency operation of the medical device, electrical energy is drawn not only from the battery module (9) arranged in the basic receptacle (10) but also from the battery module (9') arranged in the additional receptacle (10') for operating the medical device.

9. The apparatus according to any one of claims 1 to 6, It is characterized by: The battery storage device (7) is associated with a switching device (17), by means of which it is dynamically set whether, during continuous operation and / or emergency operation of the medical device, electrical energy is drawn only from the battery module (9) arranged in the basic receptacle (10) for operating the medical device, or whether electrical energy is drawn not only from the battery module (9) arranged in the basic receptacle (10) but also from the battery module (9') arranged in the additional receptacle (10').

10. The device according to any one of the preceding claims, It is characterized by: The battery storage (7) is designed so that as long as the number of basic receptacles (10) without battery modules (9) or the number of basic receptacles (10) with battery modules (9) arranged in corresponding basic receptacles (10) bridged does not exceed a limit number greater than 0, the battery storage supports and / or enables continuous operation of the medical device and / or enables emergency operation of the medical device.

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