Modular energy storage system

Abstract

The invention relates to a modular energy storage system (100) for mounting on a support rail, comprising: at least one frame module (110) which can be mounted on the support rail; and at least one energy storage module (111) having one or more battery cells (531), which energy storage module can be plugged into the at least one frame module (110) so as to produce an electrical connection; wherein the at least one frame module (110) has an electrical contact element (120) for producing a plug-in electrical connection to a structurally identical contact element (120) of a further frame module (110), wherein the electrical contact element (120) has a female contact portion (121) and a male contact portion (122), which extend along a longitudinal direction (125) of the contact element (120), and a third contact portion (123), which is oriented transversely to the longitudinal direction (125) and is designed to produce a plug-in electrical connection to the energy storage module (111) in order to charge or to discharge the one or more battery cells (531).

Description

[0001] Modular energy storage system

[0002] The invention relates to a modular energy storage system for storing energy, in particular a modular energy storage system for a mounting rail such as a DIN-Rai I rail, which can be extended by several energy storage modules without tools or cables.

[0003] Battery modules for providing electrical energy are used, for example, in uninterruptible power supplies (UPS). These battery modules are permanently installed in a control cabinet and electrically connected via permanently installed cables. Installation and removal from the control cabinet require tools. The battery modules are mounted in the control cabinet according to a fixed, predefined configuration that meets predetermined power supply performance requirements.

[0004] All currently available battery module systems use cables for the electrical connection of the battery modules and cannot be expanded. Expanding or reducing the capacity of the battery module system, even retroactively, is not possible. Installing the battery module system is complex and requires significant time and expense.

[0005] The invention aims to create a modular energy storage system that requires no cables for the electrical connection of the energy storage modules or battery modules and can therefore be installed, removed, and expanded without tools. Furthermore, it aims to create a modular energy storage system whose capacity can be easily increased or decreased at a later date.

[0006] This problem is solved by the items with the features according to the independent claims. Advantageous embodiments are the subject of the dependent claims, the description, and the drawings.

[0007] The invention is based on the idea of ​​creating a modular energy storage system where, thanks to a simple plug-in design, no cables are required to connect the energy storage units to the energy pack / head module. Additionally, the battery pack's capacity can be increased or decreased. The simple plug-in design allows even unskilled personnel to replace and expand the energy system. Furthermore, the presented energy storage system enables faster and more convenient installation, saving time and costs. The energy storage system can be used on DIN rails or top-hat rails in industrial electrical applications.

[0008] The energy storage system presented here allows for cable- and tool-free assembly and replacement of energy storage units, as well as capacity expansion after delivery to the customer or installation in the field. The energy storage units can be connected in series or parallel by varying their arrangement.

[0009] According to a first aspect, the task described above is solved by a modular energy storage system for mounting on a support rail, comprising: at least one frame module that can be mounted on the support rail; and at least one energy storage module with one or more battery cells, which can be plugged into the at least one frame module by establishing an electrical connection;wherein the at least one frame module has an electrical contact element for making a pluggable electrical connection with an identically designed contact element of another frame module, wherein the electrical contact element has a female contact section and a male contact section extending along a longitudinal direction of the contact element and a third contact section oriented transversely to the longitudinal direction and designed to make a pluggable electrical connection with the energy storage module in order to charge or discharge the one or more battery cells.

[0010] Such a modular energy storage system requires no cables for the electrical connection of the energy storage modules. The energy storage modules, or battery modules, can be easily plugged into the electrical contact element on the frame module and electrically connected to each other via this contact element. This allows the energy storage system to be expanded without tools; the energy storage modules can be installed, removed, and expanded without tools. The capacity of the modular energy storage system can therefore be easily increased or decreased at a later date.

[0011] In an advantageous embodiment of the modular energy storage system, when a frame module is mounted on the support rail, the longitudinal direction of the electrical contact element runs along the support rail, and the third contact section is oriented perpendicular to the support rail. This allows the frame modules to be electrically connected to each other via the female and male contact sections of the contact element and to be easily expanded. The energy storage devices of the respective frame modules can be electrically contacted and connected via the third contact section. This enables simple installation without the need for tools.

[0012] In an advantageous embodiment of the modular energy storage system, the energy storage module comprises an electrical contact designed to fit the third contact section, which can be plugged into the third contact section to establish the electrical connection with the frame module.

[0013] The energy storage module can be electrically connected to the third contact section of the contact element via its electrical contact, thus easily expanding or reducing the energy storage system.

[0014] In an advantageous embodiment of the modular energy storage system, the female contact section is designed as an elastically deformable clamping contact.

[0015] This allows for easy insertion of the male contact section of an adjacent frame module, thus expanding the system by an additional energy storage module without the need for tools.

[0016] In an advantageous embodiment of the modular energy storage system, the third contact section is functionally identical to the female contact section.

[0017] The third contact section can be designed similarly to the female contact section, so that the same plugging function can be achieved. In a further embodiment, the third contact section can even be identical in construction to the female contact section.

[0018] This allows for easy manufacturing of both the contact element and the contacts on the energy storage module, as the same or a similar design can be used.

[0019] In an advantageous embodiment of the modular energy storage system, the

[0020] The energy storage module has a contact section that matches the third

[0021] The contact section of the electrical contact element of the frame module is shaped. This allows the energy storage module to be easily plugged into the frame module and creates the pluggable electrical connection between the two modules.

[0022] In an advantageous embodiment of the modular energy storage system, the third contact section of the electrical contact element is configured as a female contact section and the contact section of the energy storage module as a male contact section, or vice versa; or the third contact section of the electrical contact element and the contact section of the energy storage module are configured as a universal connection.

[0023] All types of electrical connectors can be implemented to create a pluggable electrical connection between the energy storage module and the frame module, providing flexibility in the design of the modular energy storage system.

[0024] In an advantageous embodiment of the modular energy storage system, the electrical contact element of the at least one frame module is designed as a bent sheet metal part.

[0025] This enables simple manufacturing of the contact element in the industrial process.

[0026] In an advantageous embodiment of the modular energy storage system, the electrical contact element forms part of a power path of the modular energy storage system for transferring electrical energy.

[0027] The electrical contact element can therefore be used directly as a busbar, via which high power from the energy modules can be transmitted without the need for additional wiring.

[0028] In an advantageous embodiment of the modular energy storage system, the at least one frame module has a second electrical contact element for establishing a pluggable electrical connection with an identically designed second contact element of the further frame module, wherein the second electrical contact element is identical in design to the electrical contact element.

[0029] A second electrical connection can be established via the second contact element, independent of the first electrical connection via the (first) contact element. This allows for the creation of an additional busbar or the implementation of a communication connection.

[0030] In an advantageous embodiment of the modular energy storage system, the second electrical contact element forms part of a communication path of the modular energy storage system for transmitting communication signals.

[0031] This makes it possible to implement the communication path independently of the energy path and to expand or reduce it without tools by adding or removing further energy modules.

[0032] In an advantageous embodiment of the modular energy storage system, the energy storage module comprises a battery block with one or more battery cells for storing energy; and the energy storage module comprises a battery management system which is communicatively connected via the communication path to a battery management system of another energy storage module and is configured to establish a charge balance between the energy storage module and the other energy storage module.

[0033] This allows for charge balancing between different energy modules. For example, when adding a new energy module, the battery load can be redistributed to the new battery module, thus reducing the load on the existing energy modules.

[0034] In an advantageous embodiment of the modular energy storage system, this comprises: a head module that can be mounted on the mounting rail; wherein the head module has a communication interface that can be electrically connected to the second electrical contact element of the at least one frame module in order to establish a communication link via the communication path to the energy storage module of the at least one frame module.

[0035] The head module serves to externally connect the energy storage modules and can also be electrically and communicatively connected to the (first) frame module without tools.

[0036] In an advantageous embodiment of the modular energy storage system, the head module has a power interface that can be electrically connected to the electrical contact element of the at least one frame module in order to supply power to the energy storage module of the at least one frame module or to deliver power from the energy storage module.

[0037] This allows the energy storage system to be charged or to supply its power to external loads.

[0038] In an advantageous embodiment of the modular energy storage system, the power interface can be electrically connected to a charging terminal of an uninterruptible power supply to provide the power.

[0039] The energy storage system can therefore be used as an uninterruptible power supply and supply external consumers with power via the charging terminal.

[0040] In an advantageous embodiment of the modular energy storage system, the at least one frame module comprises a housing into which the energy module can be inserted.

[0041] The energy module can therefore be easily inserted or plugged into the housing of the frame module by hand to expand or reduce the energy storage system without the need for tools.

[0042] In an advantageous embodiment of the modular energy storage system, the housing has locking elements which, when the at least one frame module is mounted on the support rail, lock into corresponding counter-locking elements of an identical housing of another frame module or into corresponding counter-locking elements of the head module.

[0043] This allows the energy storage system to be firmly attached to the support rail by means of a fixed connection between the frame modules.

[0044] Further examples of implementation are explained with reference to the accompanying drawings. These show:

[0045] Fig. 1 shows a three-dimensional representation of a modular energy storage system 100 according to the invention in one embodiment; Fig. 2 shows a three-dimensional representation of a modular energy storage system 100 according to the invention in a minimal configuration according to one embodiment;

[0046] Fig. 3a shows a three-dimensional representation of a frame module 110 of the modular energy storage system 100 with the energy storage module 111 extended according to one embodiment;

[0047] Fig. 3b shows a three-dimensional representation of the rear side of the frame module 110 according to one embodiment;

[0048] Fig. 3c shows a three-dimensional representation of an electrical contact element 120 of the frame module 110 according to one embodiment;

[0049] Fig. 3d shows a schematic representation of a pluggable electrical connection between the frame module and the energy storage module in the embodiment as a universal plug connection;

[0050] Fig. 3e shows a schematic representation of a pluggable electrical connection between the frame module and the energy storage module in the embodiment as a female-male plug connection;

[0051] Fig. 3f shows a schematic representation of a pluggable electrical connection between the frame module and the energy storage module in the embodiment as a male-female plug connection;

[0052] Fig. 4 shows a three-dimensional representation of the frame module 110 of the modular energy storage system 100 without energy storage module 111 according to one embodiment;

[0053] Fig. 5 shows an electrical circuit diagram of the modular energy storage system 100 according to one embodiment of the invention; and

[0054] Fig. 6 shows an electrical circuit diagram of a battery module 111 of the modular energy storage system 100 according to one embodiment of the invention. The following detailed description refers to the accompanying drawings, which form part thereof and illustrate specific embodiments in which the invention can be implemented. It is understood that other embodiments can also be used and structural or logical modifications can be made without departing from the concept of the present invention. Therefore, the following detailed description is not to be understood as limiting. Furthermore, it is understood that the features of the various embodiments described herein can be combined with one another, unless specifically stated otherwise.

[0055] The aspects and embodiments are described with reference to the drawings, whereby identical reference numerals generally refer to identical elements.

[0056] Devices and procedures are described. It is understood that fundamental properties of the devices also apply to the procedures and vice versa. Therefore, for the sake of brevity, a duplicate description of such properties will be omitted where necessary.

[0057] Fig. 1 shows a three-dimensional representation of a modular energy storage system 100 according to the invention in one embodiment.

[0058] The modular energy storage system 100 can be mounted on a support rail, which is not shown in Figure 1.

[0059] The modular energy storage system 100 comprises at least one frame module 1 10 that can be mounted on the mounting rail; and at least one energy storage module 1 11 with one or more battery cells 531, which can be plugged into the at least one frame module 1 10 by establishing an electrical connection. In this example, an exemplary number of six frame modules 1 10 with associated energy storage modules 1 11 are shown, each arranged side by side on the mounting rail (not shown).

[0060] Furthermore, the modular energy storage system 100 shown in Figure 1 comprises a head module 130, which is shown on the left side of Figure 1, and to which the respective frame modules 110 with corresponding energy storage modules 111 are connected. The at least one frame module 110 comprises an electrical contact element 120, which is not visible in Figure 1, for establishing a pluggable electrical connection with an identically designed contact element 120 of another frame module 110. The electrical contact element 120 has a female contact section 121 and a male contact section 122, which extend along a longitudinal direction 125 of the contact element 120, and a third contact section 123, which is oriented transversely to the longitudinal direction 125 and is designed to establish a pluggable electrical connection with the energy storage module 111. The contact element 120 is shown in Figures 3a-c.

[0061] The head module 130 can be mounted on the mounting rail.

[0062] The head module 130 can have a communication interface 131, as shown in Figure 5, which can be electrically connected to the second electrical contact element 120a of the frame module 110 in order to establish a communication link via the communication path 520 to the energy storage module 111 of the frame module 110.

[0063] The head module 130 can have a power interface 132 (see Figure 5) which can be electrically connected to the electrical contact element 120 of the at least one frame module 110 in order to supply power to the energy storage module 111 of the at least one frame module 110 or to the one or more battery cells 531 contained therein, or to supply power from the energy storage module 111.

[0064] The head module 130 can include a controller 135 to perform control tasks. The controller 135 is, for example, coupled via the communication interface 131 to the communication path 520 and, via that, to the frame modules 110 and their respective energy storage modules 111.

[0065] Fig. 2 shows a three-dimensional representation of a modular energy storage system 100 according to the invention in a minimal expansion stage according to one embodiment.

[0066] In the minimal expansion stage shown here, the modular energy storage system comprises only a frame module 110 with associated energy storage module 111 and the head module 130.

[0067] On the top side of the frame module, locking elements 113 can be seen, which, when the frame modules 110 are aligned, lock into counter-locking elements 114 of the adjacent frame module 110 or, in this case, into counter-locking elements 134 of the head module 130, thus fixing the frame module(s) to each other and to the head module 130.

[0068] Fig. 3a shows a three-dimensional view of a frame module 1 10 of the modular energy storage system 100 with an extended energy storage module 111 according to one embodiment. Fig. 3b shows a three-dimensional view of the rear side of the frame module 1 10 according to one embodiment. Fig. 3c shows a three-dimensional view of an electrical contact element 120 of the frame module 1 10 according to one embodiment.

[0069] The frame module 110 comprises an electrical contact element 120, as shown in detail in Figure 3c, which serves to create a pluggable electrical connection with an identically designed contact element 120 of another frame module 110.

[0070] The electrical contact element 120 has a female contact section 121 and a male contact section 122, which extend along a longitudinal direction 125 of the contact element 120, and a third contact section 123, which is oriented transversely to the longitudinal direction 125 and is designed to establish a pluggable electrical connection with the energy storage module 111.

[0071] As shown in Figures 3a to 3c, when the frame module 110 is mounted on the support rail, the longitudinal direction 125 of the electrical contact element 120 runs along the support rail and the third contact section 123 is aligned perpendicular to the support rail.

[0072] The energy storage module 1 11 includes an electrical contact designed to fit the third contact section 123 (not shown or recognizable in the figures), which can be plugged into the third contact section 123 to establish the electrical connection with the frame module 1 10.

[0073] The female contact section 121, for example, is designed as an elastically deformable clamping contact.

[0074] The third contact section 123 can be functionally identical to the female contact section 121, so that the same plugging function can be performed with both contact sections 123 and 121. In one embodiment, the third contact section 123 can even be structurally identical to the female contact section 121. The electrical contact element 120 of the at least one frame module 110 can, for example, be designed as a bent sheet metal part. It can be inserted into and removed from the frame module 110, for example, by means of inserts in the housing of the frame module 110, as can be seen in Figure 3b.

[0075] The electrical contact element 120 can thus form part of a power path 510, as shown in more detail in Figure 5, of the modular energy storage system 100 for transferring electrical energy, via which the one or more battery cells 531, as shown in more detail in Figure 5, can be charged and / or discharged.

[0076] In the illustrations of Figures 3a and 3b, the frame module 110 includes a second electrical contact element 120a for establishing a pluggable electrical connection with an identically designed second contact element 120a of the further frame module 110. The second electrical contact element 120a can be identical in design to the electrical contact element 120.

[0077] The second electrical contact element 120a can form part of a communication path 520, as shown in more detail in Figure 5, of the modular energy storage system 100 for transmitting communication signals.

[0078] The energy storage module 111 can comprise a battery block 530 with one or more battery cells 531 for storing energy, as shown in Figure 5.

[0079] The energy storage module 111 can also include further electrical contact elements 120, which can be located, for example, above the electrical contact element 120 on the rear of the housing. The energy storage module 111 can be electrically connected via the electrical contact elements 120 in a series configuration or a parallel configuration with the other energy storage modules 111 of the other frame modules 110.

[0080] A spring element 301 allows the energy storage module 111 to be manually ejected from the frame module 110.

[0081] Fig. 3d shows a schematic representation of a pluggable electrical connection between the frame module 110 and the energy storage module 111 in the embodiment as a universal plug connection or interface. The energy storage module 111 has a contact section 123b (shown on the right) which is shaped to match the third contact section 123 of the electrical contact element 120 of the frame module 110.

[0082] This allows the energy storage module 111 to be easily inserted into the frame module 110, creating a pluggable electrical connection between the two modules. This connection is, for example, a mechanical and electrical connection similar to a coupling, which can be identical on both sides. Such a connection can also be referred to as a universal connection, which establishes a pluggable electrical connection between the frame module 110, in particular the third contact section 123 of the contact element 120 of the frame module 110, and the energy storage module 111, in particular contact section 123b of the energy storage module 111.

[0083] This allows all types of electrical plug connections to be implemented in order to realize the pluggable electrical connection between energy storage module 111 and frame module 110, which creates flexibility in the design of the modular energy storage system 100.

[0084] Fig. 3e shows a schematic representation of a pluggable electrical connection between the frame module 110 and the energy storage module 111 in the embodiment as a female-male plug connection or interface.

[0085] In this example, the female contact section is implemented on the side of the frame module 110, i.e., as the third contact section 123 of the contact element 120 of the frame module 110 (see left side of Figure 3e). The male contact section is implemented here on the side of the energy storage module 111, i.e., as contact section 123b of the energy storage module 111 (see right side of Figure 3e).

[0086] Fig. 3f shows a schematic representation of a pluggable electrical connection between the frame module 110 and the energy storage module 111 in the embodiment as a male-female plug connection or interface.

[0087] In this example, the male contact section is implemented on the side of the frame module 110, i.e., as the third contact section 123 of the contact element 120 of the frame module 110 (see left side of Figure 3f). The female contact section is implemented here on the side of the energy storage module 111, i.e., as contact section 123b of the

[0088] Energy storage module 11 1 (see right side of Figure 3e).

[0089] The above statements show that any combination of pluggable electrical connection between frame module 1 10 and energy storage module 1 1 1 is feasible and is covered by this disclosure.

[0090] Fig. 4 shows a three-dimensional representation of the frame module 110 of the modular energy storage system 100 without energy storage module 11 1 according to one embodiment.

[0091] The frame module 110 comprises a housing 112 into which the energy module 111 (not shown in Figure 4) can be inserted. It can be inserted or pushed into it and plugged into the contact elements 120 or the second contact elements 120a on the rear of the housing 112.

[0092] The housing 1 12 can have locking elements 1 13 which, when the at least one frame module 110 is mounted on the support rail, engage in corresponding counter-locking elements 1 14 of an identical housing 1 12 of another frame module 1 10 or in corresponding counter-locking elements 134 of the head module 130, as shown in Figure 2.

[0093] Fig. 5 shows an electrical circuit diagram of the modular energy storage system 100 according to the invention in one embodiment.

[0094] The modular energy storage system 100 comprises at least one frame module 110 that can be mounted on the mounting rail; and at least one energy storage module 111 with one or more battery cells 531, which can be plugged into the at least one frame module 110 by establishing an electrical connection. In this example, an exemplary number of six frame modules 110 with associated energy storage modules 111 is shown, which can each be arranged side by side on the mounting rail.

[0095] Furthermore, the energy storage system 100 includes a head module 130, to which the respective frame modules 1 10 with corresponding energy storage modules 11 1 are attached.

[0096] The at least one frame module 110 comprises an electrical contact element 120, as described above with reference to Figures 1 to 4, for establishing a pluggable electrical connection with an identically designed contact element 120 of another frame module 110. The electrical contact element 120 has a female contact section 121 and a male contact section 122, which extend along a longitudinal direction 125 of the contact element 120, and a third contact section 123, which is oriented transversely to the longitudinal direction 125 and is designed to establish a pluggable electrical connection with the energy storage module 111. The female contact section 121 can establish an electrical connection with a male contact section 122 of the respective adjacent frame module 111. The same applies to the male contact section 122.

[0097] The energy storage module 11 1 can include a battery management system 540, which is communicatively connected via the communication path 520 to a battery management system 520 of another energy storage module 11 1. The battery management system can be configured to establish charge balancing between the energy storage module 1 11 and the other energy storage module 111.

[0098] The power interface 132 can be electrically connected to a charging terminal 133 of an uninterruptible power supply (UPS) to provide the power. The modular energy storage system 100 can serve as an uninterruptible power supply or draw power from an uninterruptible power supply.

[0099] The modular energy storage system 100 can also be electrically connected to another modular energy storage system 100 and function as part of a higher-level energy storage system 100.

[0100] A sensor or shunt 532 can be arranged in the respective energy storage module 111 to, together with a monitoring module 533, detect the current flowing into the energy storage module 1111 and to detect a fault current, such as a short circuit or an overload. The monitoring module can report a detected fault current to the battery management system 540, so that the battery management system 540 can initiate appropriate measures in the event of a fault, such as disconnecting the battery storage module 111 from the energy storage system 100, etc.

[0101] A charge / discharge switch 534 can be controlled via the battery management system 540 to charge or discharge the battery cells 531. Additionally, a protective switch 537, for example a fuse 537, can be provided to disconnect the current path in the event of a fault. Each energy storage module 111 can have a communication interface 535 to communicate with the other energy storage modules 111 and / or with the head module 130. This communication interface 535 is coupled to the communication path 520, for example via the second contact element 120a of the frame module 110, as described above with reference to Figures 1 to 4.

[0102] Fig. 6 shows an electrical circuit diagram of a battery module 1 11 of the modular energy storage system 100 according to one embodiment of the invention.

[0103] The energy storage module 111 includes a communication interface 535 for communication with the other energy storage modules 111 and / or with the head module 130. This communication interface 535 is coupled to the communication path 520, for example via the second contact element 120a, as described above with reference to Figures 1 to 4.

[0104] The energy storage module 111 comprises a sensor or shunt 532 and a monitoring module 533. The sensor 532, together with the monitoring module 533, can detect the current flowing into the energy storage module 111 and detect a fault current, such as a short circuit or an overload. The monitoring module 533 can report the detected fault current to the battery management system 540, enabling the battery management system 540 to initiate appropriate measures in the event of a fault, such as disconnecting the battery storage module 111 from the energy storage system 100, etc.

[0105] A charge / discharge switch 534 can be controlled via the battery management system 540 to charge or discharge the battery cells 531. Additionally, a protective switch 537, for example a fuse 537, can be provided to disconnect the current path in the event of a fault.

[0106] The energy storage module 111 can further include a heating element 536, which can heat the battery cells 531, for example, to reach an operating temperature at which the battery cells can efficiently charge and store energy. The heating element 536 can be controlled by the battery management system 540 and / or the head module 130. Tasks of the battery management system 540 can include: voltage measurement of the battery cells 531, balancing, temperature monitoring, current measurement, and voltage measurement of the entire battery module 530 or the battery cell pack 530.

[0107] The battery cell pack 530 can, for example, consist of LiFePO4 battery cells, for example with a power output of 60-99Wh.

[0108] The battery management system 540 can send or receive the following instructions via the communication interface 535, for example: switching the charge / discharge switch 534 on or off, transmitting lifetime counter readings, controlling operating modes, controlling self-discharge, SOH, SOC, cycle counter, manufacturer data, e.g. capacity and / or chemistry of the battery pack 530, alarms, instantaneous current, instantaneous voltage of the battery pack 530.

[0109] The battery management system 540 can control LEDs 538 to inform the user about the current operating status of the energy storage module by means of the states of the LEDs 538. These LEDs 538 can be mounted on the front of the energy storage module 1 11, as shown in Figure 1, so that the operating status is visible to the user when the energy storage module 1 11 is inserted into the frame module 1 10.

[0110] For example, a voltage of +24 volts relative to ground can be applied to power path 510, as shown in Figure 6.

Claims

PATENT CLAIMS 1. Modular energy storage system (100) for mounting on a support rail, comprising: at least one frame module (110) that can be mounted on the support rail; and at least one energy storage module (111) with one or more battery cells (531) which can be plugged into the at least one frame module (110) by establishing an electrical connection;wherein the at least one frame module (110) has an electrical contact element (120) for establishing a pluggable electrical connection with an identically designed contact element (120) of another frame module (110), wherein the electrical contact element (120) has a female contact section (121) and a male contact section (122) extending along a longitudinal direction (125) of the contact element (120) and a third contact section (123) oriented transversely to the longitudinal direction (125) and configured to establish a pluggable electrical connection with the energy storage module (111) in order to charge or discharge the one or more battery cells (531).

2. Modular energy storage system (100) according to claim 1, wherein, in the case of a frame module (110) mounted on the support rail, the longitudinal direction (125) of the electrical contact element (120) runs along the support rail and the third contact section (123) is oriented perpendicular to the support rail.

3. Modular energy storage system (100) according to claim 1 or 2, wherein the energy storage module (111) comprises an electrical contact designed to fit the third contact section (123), which can be plugged into the third contact section (123) to establish the electrical connection with the frame module (110).

4. Modular energy storage system (100) according to one of the preceding wherein the female contact section (121) is designed as an elastically deformable clamping contact.

5. Modular energy storage system (100) according to one of the preceding wherein the third contact section (123) is functionally identical to the female contact section (121).

6. Modular energy storage system (100) according to one of the preceding wherein the energy storage module (111) has a contact section (123b) which is shaped to fit the third contact section (123) of the electrical contact element (120) of the frame module (110).

7. Modular energy storage system (100) according to claim 6, wherein the third contact section (123) of the electrical contact element (120) is configured as a female contact section and the contact section (123b) of the energy storage module (111) is configured as a male contact section or vice versa; or wherein the third contact section (123) of the electrical contact element (120) and the contact section (123b) of the energy storage module (111) are configured as a universal connection.

8. Modular energy storage system (100) according to one of the preceding wherein the electrical contact element (120) of the at least one frame module (110) is designed as a sheet metal part.

9. Modular energy storage system (100) according to one of the preceding claims, wherein the electrical contact element (120) forms part of a power path (510) of the modular energy storage system (100) for transferring electrical energy.

10. Modular energy storage system (100) according to one of the preceding claims, wherein the at least one frame module (110) has a second electrical The contact element (120a) for making a pluggable electrical connection with a second contact element (120a) of identical design of the further frame module (110) is the second electrical contact element (120a) being identical in design to the electrical contact element (120).

11. Modular energy storage system (100) according to claim 10, wherein the second electrical contact element (120a) forms part of a communication path (520) of the modular energy storage system (100) for transmitting communication signals.

12. Modular energy storage system (100) according to claim 11, wherein the energy storage module (111) comprises a battery block (530) with one or more battery cells (531) for storing energy; and wherein the energy storage module (111) comprises a battery management system (540) which is communicatively connected via the communication path (520) to a battery management system (520) of another energy storage module (111) and is configured to establish a charge balance between the energy storage module (111) and the other energy storage module (111).

13. Modular energy storage system (100) according to one of claims 10 to 12, comprising: a head module (130) that can be mounted on the mounting rail; wherein the head module (130) has a communication interface (131) that can be electrically connected to the second electrical contact element (120a) of the at least one frame module (110) in order to establish a communication connection via the communication path (520) to the energy storage module (111) of the at least one frame module (110).

14. Modular energy storage system (100) according to claim 13, wherein the head module (130) has a power interface (132) which can be electrically connected to the electrical contact element (120) of the at least one frame module (110) in order to supply power to the energy storage module (111) of the at least one frame module (110) or to deliver power from the energy storage module (111).

15. Modular energy storage system (100) according to claim 14, wherein the power interface (132) can be electrically connected to a charging terminal (133) of an uninterruptible power supply to provide the power.

16. Modular energy storage system (100) according to one of claims 13 to 15, wherein the at least one frame module (110) comprises a housing (112) into which the energy module (111) can be inserted.

17. Modular energy storage system (100) according to claim 16, wherein the housing (112) has locking elements (113) which, when the at least one frame module (110) is mounted on the support rail, engage in corresponding counter-locking elements (114) of an identical housing (112) of a further frame module (110) or in corresponding counter-locking elements (134) of the head module (130).

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