DE102017207055A1 - Electrochemical energy storage, cell controller, energy storage system, means of transportation and contacting device for an electrical energy storage system - Google Patents

Abstract

An electrochemical energy store, a cell controller, an energy storage system, a means of locomotion and a contacting device (1) for an electrical energy storage system (100) are proposed. The contacting device (1) comprises: a first external electrical interface (2), a second external electrical interface (3), and a balancing resistor (4), the first electrical interface (2) being set up with a cell controller (5 ) for monitoring the electrical energy storage system (100) to be electrically connected, wherein the second electrical interface (3) is adapted to be electrically connected to an electrical energy store (6) of the electrical energy storage system (100) and the balancing resistor (4) is arranged to conduct a current for charge equalization between memory cells of the electrical energy storage device (6) via the first electrical interface (2) and via the second electrical interface (3).

Description

State of the art

The present invention relates to an electrochemical energy store, a cell controller, an energy storage system and a contacting device for an electrical energy storage system. In particular, the present invention relates to an improved architecture for sharing the balancing components and better reusability of cell controllers for measuring the temperature and voltage of electrochemical storage cells.

In systems with interconnected battery cells, e.g. a battery system / a traction battery, today usually take so-called cell controllers task to measure the voltages and temperatures of the battery cells. Furthermore, these have the task of bringing the battery cells at different charge states, which can be determined by means of voltage measurements, to a uniform charge level. This process is commonly referred to as "balancing" battery cells.

In order to harmonize the state of charge of all the interconnected battery cells, the battery cells, which are above the charge level of the battery cell with the lowest charge level, are usually discharged. This is done by the temporary connection of load resistors to these battery cells. In this case, the stored energy of these battery cells lying above the charge level of the lowest battery cell is converted into heat by being converted via a balancing resistor / load resistor. In practice, the cell controller used is usually designed so that it is able to "balance" even battery cells with a larger spread. This is necessary in particular when, in the case of a modularization of the cell controller, the same cell controller is to be used for cells of different suppliers and / or cell technologies, as is usually the case in a multi-supplier strategy. As a result, the design of the cell controller with respect to the load resistances and their heating when balancing on the battery cells must be oriented with the greatest self-discharge rate.

Due to the structural design of the cell controller on the basis of a printed circuit board (PCB) with poorly thermally conductive plastic component due to build-up, the waste heat generated at the "balances" is an essential criterion, which determines the area required for the heat-resistant arrangement of the load resistors of the printed circuit board. This means that the higher the scatter of the battery cells, the higher the area requirement of the PCB of the cell controller. The goal in energy storage, however, is to keep the size of non-energy-storing components as low as possible. There are approaches, such as the introduction of thick-film copper plating into PCBs, which can reduce the area required for the cooling of components on a PCB. However, these are quite expensive.

For contacting the cell controllers with the battery cells, depending on their location in a system, there are various approaches, such as e.g. the direct contacting via bonding, welding, plugging, soldering, etc. as well as the indirect contacting via line elements from e.g. Punched screens, flat / round conductors, printed conductors, etc., which in turn are connected via common joining methods with the battery cells or cell controllers. As the size of a system with interconnected battery cells increases, larger contacting systems are needed to connect battery cells to the cell controllers. This is especially the case when large systems are to be managed with as few cell controllers as possible. From the relationships described above and the resulting dependencies, it is possible to pursue an optimized architectural approach for mapping the functions of a cell controller.

EP 3 048 697 A1 shows a special electrotechnical approach for the implementation of a battery management with special functional architecture.

WO 2014/199181 A1 discloses a cell management module, a battery and a corresponding method for optimizing thermal management, wherein field effect transistors for balancing are arranged on a dissipative substrate and driven by a cell controller. Since the balancing currents only flow through the cells to be balanced and the FETs, the cell controller only has to output control signals to the FETs.

Based on the aforementioned prior art, it is an object of the present invention to provide a space-and cost-optimized approach for an optimized architecture of an electrochemical energy storage system.

The aforementioned object is achieved by a contacting device for an electrical energy storage system. The electrical energy storage system may be, for example, an electrochemical traction energy storage system for a means of transportation. The contacting device comprises a first external electrical interface and a second external electrical interface and a balancing Resistance. The first electrical interface is there to electrically connect the cell controller of the energy storage system with the contacting device. The second electrical interface is there to electrically connect the electrochemical energy store with the contacting device. As part of the contacting device, the balancing resistor is arranged to conduct a balancing current from the first electrical interface to the second electrical interface (or vice versa). In other words, the contacting device directs the balancing current from the cell to be balanced and through the balancing resistor into the cell controller. Optionally, the same current is also conducted from the cell controller and via the first electrical interface and the second electrical interface back into the electrical energy storage. In contrast to the prior art, therefore, not only a control signal is obtained from the cell controller, so that active switching elements in the contacting device according to the invention are not required for this purpose. Thus, the contacting device can be carried out inexpensively and with a particularly small volume. In this way, the cell controller has to conduct the balancing current in full. However, this leads due to the low resistance to no significant thermal load on the cell controller, which can thus be made very universal and inexpensive and can be manufactured with a small volume. The heat generated during balancing can be released via the contacting device to the environment (eg body component, the thermal mass of the electrical energy storage system or the like). The contacting device can be arranged outside a housing of the cell controller and, alternatively or additionally, outside a housing of the electrical energy store.

The dependent claims show preferred developments of the invention.

The second electrical interface can have spatially corresponding electrical contacts with poles of a pack of electrical cells of the electrochemical energy store. In other words, the contacting device can be configured such that positions of the poles resulting from the cell geometry or cell pack geometry are imaged by corresponding electrical contacts of the second interface. In other words, the electrical contacts of the second electrical interface preferably provide a spatially predefined arrangement, which is spatially matched to the battery pack geometry. In this way, the second electrical interface can be electrically connected to the poles of the electrical energy store in a particularly simple manner (for example by soldering, welding or the like) and / or automatically.

By way of example, the first electrical interface can have a plug connection by means of which an electrical connection to the cell controller can be established. The electrical connection can be reversible. It can have a latching device which can enter into a connection secured against undesired release with a corresponding latching device of the cell controller. Thus, the cell controller can be arranged spatially flexible in the environment of the electrical energy storage or the contacting device. In particular, defects on the cell controller, on the contacting device and / or on the electrical energy store can be remedied quickly and efficiently by respectively exchanging the affected component.

In order not to damage the balancing resistors, which can sometimes be designed for comparatively small currents, in the case of a static discharge, the capacitors can be arranged in parallel with the balancing resistors, which can buffer sudden potential differences. In this way, a short-term high heating and / or overuse of the balancing resistors can be avoided. Each balancing resistor may have its own capacitor connected in parallel. Alternatively, multiple balancing resistors may have a common capacitor which protects the respective balancing resistors from static discharge. In order to enable the balancing for individual cells separately, switches can be provided in order to release the respectively required balancing resistor from the parallel connection of the other balancing resistors or of the capacitor.

The contacting device may have flexible or rigid electrical conductor tracks. These can be configured as a flat conductor or as a round conductor. Alternatively or additionally, a stamped grid may be provided for the electrical connection between the first electrical interface and the balancing resistor and / or for connecting the second electrical interface to the balancing resistor and, alternatively or additionally, between the first electrical interface and the second electrical interface. The stamped grid can be understood as an electrically conductive sheet having bridged by the balancing resistor interruptions.

In particular, the contacting device can be arranged spatially close to electrical contacts of electrochemical storage cells of an electrochemical energy store of the Energy storage system to be arranged. In particular, the contacting device can be defined essentially in one plane, in order to stress the smallest possible installation space. Thus, the contacting device can be arranged on the outside or inside of a housing of the electrochemical energy store and, alternatively or additionally, on a housing of the cell controller and optionally fastened there.

According to a second aspect of the present invention, an electrochemical energy storage is proposed, which may be configured for example as a traction battery. The electrochemical energy store comprises electrochemical storage cells and at least one balancing resistor. The balancing resistor serves to charge balance one or more of the electrochemical storage cells. An external third interface is set up to lead a respective electrical parameter of two of the electrochemical storage cells to the outside. In other words, the electrochemical energy store can be assessed with regard to at least two electrochemical storage cells to determine whether the electrical characteristics, in particular the charge state of the electrochemical storage cells, necessitate a balancing process. If this is the case, the external third interface can connect the balancing resistor to one of the electrochemical storage cells for the purpose of charge equalization (eg via a contacting device according to the invention and / or a cell controller according to the invention) to the periphery, such that a balancing current is supplied via an electrical current Mass of the electrochemical energy storage flows. In other words, the external third interface carries a current for charge compensation from the to be balanced electrochemical storage cell and the balancing resistor to the outside of the electrochemical energy storage.

According to a third aspect of the present invention, a cell controller for an electrical energy storage system is proposed, which comprises, for example, an electrochemical energy store according to the second-mentioned aspect of the invention and / or a contacting device according to the first-mentioned aspect of the invention. The cell controller can also be understood as an electronic control unit, which in particular has its own housing. The cell controller comprises an evaluation unit and a fourth electrical (external) interface. For example, the fourth electrical interface can reversibly make an electrical connection to the contacting device (the first external electrical interface). Therefore, the fourth electrical interface as a plug, socket o. and in particular comprising a snap-lock connection or similar. be designed. The fourth electrical interface is set up to conduct a respective electrical parameter of two of the electrochemical storage cells of an electrochemical energy store connected electrically to it to the evaluation unit and additionally to switch or conduct a current flowing through an external balancing resistor for charge equalization of one of the electrochemical storage cells , For this purpose, the cell controller has a switch, by means of which the balancing current can be switched on or interrupted by the external balancing resistor. Because the cell controller does not have the balancing resistor itself, the waste heat is also generated outside the cell controller. Due to the fact that the cell controller has the switch for switching the balancing current on and off, corresponding active components in the contacting device according to the invention or in the electrochemical energy store according to the invention can be dispensed with.

Both the contacting device according to the invention and the electrochemical energy store or the cell controller according to the invention can have as a first or second or third or fourth electrical external interface a plug connection and / or flat contacts and / or a solder connection and / or an SMD connection and / or a Crimp connection include. The connector can be combined with other types of connections, in particular for securing an unwanted release. For example, a bayonet connection, a pivot lever lock, a snap / lock connection or similar. be provided to secure the electrical connection of the interfaces.

According to a fourth aspect of the invention, an energy storage system is proposed, which can be designed as an electrochemical or electrical energy storage system, preferably for traction energy for automotive use. It comprises a contacting device according to the first-mentioned aspect of the invention and, alternatively or additionally, an electrochemical energy store according to the second-named aspect of the invention and, alternatively or additionally, a cell controller according to the third aspect of the invention. At least one of the three aforementioned components of the energy storage system is designed according to the invention. The cell controller is set up to conduct a balancing current through the balancing resistor and the affected memory cell in response to detection of a charge balancing requirement or balancing requirement of an electrical memory cell or a plurality of electrical memory cells of the electrochemical energy store. In other words, flows through the cell controller of the energy storage system, the same stream, which by the Resistor used for charge equalization (resistance to balancing, balancing resistor) flows. In this way it is avoided that the balancing resistor must be switched by a switch external to the cell controller. In this way, a simple structure of the contacting device or of the electrochemical energy store of the energy storage system and yet an extremely low heating by balancing processes, which are caused or controlled by the cell controller of the energy storage system results.

According to a fifth aspect of the present invention, a means of transportation is proposed, which may be designed as a car, van, truck, motorcycle, aircraft and / or watercraft. The means of locomotion comprises an energy storage system according to the fourth aspect of the invention, which it can use in particular for the provision of traction energy. The features, combinations of features and resulting from this advantage of the means according to the invention and the energy storage system according to the invention are apparent from those embodiments which in conjunction with the former, the second-mentioned and the third-mentioned aspect of the invention, that to avoid repetition of the above is referenced.

• 1 eine Prinzipskizze eines aus dem Stand der Technik bekannten elektrischen Energiespeichersystems;
• 2 eine Explosionsdarstellung eines aus dem Stand der Technik bekannten Energiespeichersystems;
• 3 eine Prinzipskizze eines weiteren aus dem Stand der Technik bekannten Energiespeichersystems;
• 4 eine Explosionsdarstellung des Weiteren aus dem Stand der Technik bekannten Energiespeichersystems;
• 5 eine vereinfachte Prinzipskizze eines im Stand der Technik bekannten Energiespeichersystems;
• 6 eine Prinzipskizze eines ersten Ausführungsbeispiels eines erfindungsgemäß ausgestalteten Energiespeichersystems;
• 7 eine Explosionsdarstellung unterschiedlicher Alternativen des ersten Ausführungsbeispiels eines erfindungsgemäß ausgestalteten Energiespeichersystems;
• 8 eine Prinzipskizze eines zweiten Ausführungsbeispiels eines erfindungsgemäß ausgestalteten Energiespeichersystems;
• 9 eine Prinzipskizze eines Ausführungsbeispiels einer erfindungsgemäß ausgestalteten Kontaktierungseinrichtung; und
• 10 eine vereinfachte Prinzipskizze eines Ausführungsbeispiels eines erfindungsgemäß ausgestalteten Energiespeichersystems.

Further details, features and combinations of features and advantages will become apparent from the embodiments, which are described below with reference to the accompanying figures. Show it:

• 1 a schematic diagram of a known from the prior art electrical energy storage system;
• 2 an exploded view of a known from the prior art energy storage system;
• 3 a schematic diagram of another known from the prior art energy storage system;
• 4 an exploded view of the further known from the prior art energy storage system;
• 5 a simplified schematic diagram of an energy storage system known in the prior art;
• 6 a schematic diagram of a first embodiment of an inventively designed energy storage system;
• 7 an exploded view of different alternatives of the first embodiment of an inventively designed energy storage system;
• 8th a schematic diagram of a second embodiment of an inventively designed energy storage system;
• 9 a schematic diagram of an embodiment of an inventively designed contacting device; and
• 10 a simplified schematic diagram of an embodiment of an inventively designed energy storage system.

1 shows a schematic diagram of an energy storage system known in the art 100 , which is about electrochemical cells in an electrical energy storage 6 features. The energy storage 6 is via a first contacting system 1 (also within a housing 6a a battery cell module) with a cell controller 5 electrically connected, the cell controller 5 Balancing resistors 4 and a logic 4a for controlling the balancing. The balancing resistors 4 are considered internal balancing resistors within the cell controller 5 arranged and heat the cell controller 5 depending on the "destructive" charge. The cell controller is correspondingly large 5 To perform and accordingly good to thermally connect it to the heat dissipation with its periphery.

2 shows an exploded view of a known electrical energy storage system 100 in which a contacting system 1 with a cell controller 5 is provided. The contacting system 1 is set up, at predefined positions of the poles of the energy storage 6 to enter with these electrically conductive compounds and the energy of the energy storage 6 to collect collected or from the outside. In addition, the cell controller 5 set up (not shown) internal balancing resistors for charge equalization individual cells of the energy storage 6 add switch.

3 shows another embodiment of the prior art known energy storage systems 100 in which an external (outside a housing 6a of the battery cell module) 5 which oneself accordingly 1 is configured via a second contacting system 1b is electrically connected to a battery cell module, within which a first contacting system 1a with an energy storage 6 connected is. Although, by the arrangement shown, the cell controller 5 not in addition by heat from the energy storage 6 be charged. Through the balancing resistors 4 in the cell controller 5 However, waste heat generated must still be dissipated consuming.

4 shows a perspective view and an exploded view of the in 3 illustrated known energy storage system 100 , The energy storage 6 are via ribbon cable with the cell controller 5 electrically connected. The ribbon cables determine the temperature and voltage measurements of the cells within the energy store 6 through the cell controller 5 carried out. Moreover, balancing operations are either triggered or by the cell controller 5 executed. Right in the figure is an exploded view of a single energy store 6 to illustrate the basic structure of a corresponding energy storage 6 shown.

5 shows a simplified schematic diagram of an electrochemical energy storage system 100 according to the prior art, in which the functional and / or structural units energy storage 6 , Contacting system 1 and cell controllers 5 are block-like illustrated. Inside the cell controller 5 are a balancing unit comprising balancing resistors 4 and a logic 4a as well as a temperature measuring device 5a and a tension measuring device 5b arranged. The presence of balancing resistors 4 leads to a considerable thermal heating of the cell controller 5 because the stored energy of the above-average cells is converted into heat.

6 shows a schematic diagram of a first embodiment of an electrochemical energy storage system according to the invention 100 in which the balancing resistors 4 in a first contacting system 1a within a housing 6a of the battery cell module are arranged. This is the first contacting system 1a as well as the energy storage 6 comprehensive battery cell module is designed according to the invention, since the balancing resistors 4 in the prior art in the first contacting system 1a are arranged and the balancing currents both in the direction of energy storage 6 as well as in the direction of the cell controller 5 flow. In other words, no switch in the contacting system 1a provided to balancing currents in the direction of the cell controller 5 to spare. The logic 4a to balances is within the cell controller 5 accommodated, which via a second contacting system 1b the balancing currents via a fourth electrical interface 12 from the second contacting system 1b receives and returns to this. The warming due to the balancing resistors 4 converted electrical energy takes place within the battery cell module, which usually already has heat generated by appropriate Entwärmungseinrichtungen for dissipation to the internal cell resistances.

7 shows an exploded view of different components of the in 6 shown first embodiment of an energy storage system according to the invention 100 , The first interface 2 of the contacting system 1 for the connection of the (not shown) cell controller 5 is designed as a flat contact rail. Balancing resistors 4 are on the contact grid designed as a punched grid 1 arranged. The connection to the energy storage 6 via conventional copper cables 3 as a second external electrical interface. Further to the right in the picture is another embodiment of a first contacting device 1a shown, which is designed as a small circuit board, which only with load resistors, a plug-in system and a flat / foil conductor connection for contacting the energy storage 6 is provided. The first illustrated contacting device 1 can as a component unit on a contacting device 1 be provided, which has a predefined spatially distributed arrangement of electrical contacts, which with the positions of memory cells in a battery pack 6 correspond. These are set up for electrical connection by soldering and / or welding. Another embodiment shows an energy storage 6 with a flat / foil conductor 1a , which with the contacting device 1 can be connected via a foil conductor connection. Down in 7 is essentially with 4 Corresponding representation shown, but with the board of the cell controller 5 is made narrower, since the balancing resistors (not shown) are not accommodated on the board and thus do not contribute to the heating of the same.

8th shows a schematic diagram of a second embodiment of an energy storage system according to the invention 100 in which the in 6 within the first contacting system 1a arranged balancing resistors 4 in the second contacting system 1b are arranged. That way are the balancing resistors 4 also outside the case 6a arranged the battery cell module and therefore can be easily cooled. The second contacting system 1b can be configured for example as a flat conductor, as in 9 is shown.

9 shows a flat conductor as a contacting system 1 , its first interface 2 for contacting a cell controller (not shown) and its second interface 3 for contacting a memory cell comprehensive electrical energy storage device (not shown) is set up. On the flat conductor are balancing resistors 4 arranged, their balancing current both over the first interface 2 as well as the second interface 3 flows as soon as the required Switching operations were made by (not shown) cell controller.

10 shows a simplified schematic diagram of an embodiment of an electrical energy storage system 100 , which the function blocks energy storage 6 , Contacting system 1 and cell controllers 5 having. Opposite the in 5 illustrated, known from the prior art arrangement are in the contacting system 1 Balancing resistors 4 arranged, which are traversed by a balancing current, which in both energy storage 6 as well as flowing in the cell controller. To turn on the balancing power becomes the logic 4a within the cell controller 5 which is used within the cell controller 5 arranged switches, which are traversed in the balancing case of the balancing current. The cell controller 5 Therefore, it can be made smaller than known in the art because it is due to the use of external balancing resistors 4 does not have to be heated complicated.

In summary, in the functional architecture according to the invention, the balancing function is broken up into several parts in its localization. The first part maps the activation of the balancing as usual on the cell controller. The second part takes over the unloading of the cells by means of the load resistances. By dividing the location, the cell-specific "balancing" load resistors are coupled to the cell interconnection and, so to speak, modularized. Furthermore, the cell controller can be significantly reduced because it is no longer thermally loaded by the load resistors. In other words, according to the invention, a number of battery cells with a contacting system are connected to a cell controller. Preferably, the balancing resistors can be carried by the contacting system. It is advantageous that the contacting system carries specific load resistances for the balancing and in this case is adapted to the battery cell module or the quality level of the battery cell module. Depending on the scatter of the self-discharge of the battery cells larger or smaller balancing resistors can be used without a change of the cell controller is required. With a preferred use of a punched grid for the contacting system, the load resistances are optimally cooled in the "balancing" and can thus be positioned on the stamped grid to save space. The stamped grid can preferably be encapsulated or foamed and thus provides the necessary contact protection. Alternatively, flat conductors, printed circuit boards, etc. can also be used for the contacting system, which can be equipped equally with contact protection. A further advantage is that the contacting system for the battery cells usually provides enough area, so that the cooling of the load resistors can be done without problems.

A two-part contacting device / a two-part contacting system can be dispensed with if the cell controller is arranged in the battery cell module. In this case, the cell controller is preferably contacted directly via the stamped grid, which may comprise the contacting device. In a preferably central arrangement of the cell controller in the energy storage, a contacting system known in the prior art is optionally used. The cell controller may preferably be foamed or injected in this embodiment of the functional location of the balancing, as it hardly develops heat due to the balancing. Thus, its space requirement can be further reduced. The preferably selected according to the invention punched grid can be equipped in an SMT process (soldering) with the balancing resistors. Alternatively, other joining methods such as e.g. Welding, etc. for connecting the resistors on the stamped grid possible.

In principle, further electronic components, if they are not functionally required for controlling the balancing or for temperature and voltage measurement on the cell controller, such as e.g. Capacitors for electrostatic suppression, are outsourced to the contacting system or the punched grid.

LIST OF REFERENCE NUMBERS

1

contact system

1a

first contacting system

1b

second contacting system

2

first interface

3

third interface

4

Balancing resistor

4a

logic

5

cell controller

5a

Temperature measuring device

5b

Voltage measuring device

6

energy storage

6a

casing

100

electrochemical energy storage system

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

• EP 3048697 A1 [0006]
• WO 2014/199181 A1 [0007]

Claims (11)

Contacting device (1) for an electrical energy storage system (100) comprising: a first external electrical interface (2), - A second external electrical interface (3), and a balancing resistor (4), - wherein the first electrical interface (2) is arranged to be electrically connected to a cell controller (5) for monitoring the electrical energy storage system (100), - wherein the second electrical interface (3) is adapted to be electrically connected to an electrical energy store (6) of the electrical energy storage system (100) and - The balancing resistor (4) is arranged to conduct a current for charge equalization between memory cells of the electrical energy storage device (6) via the first electrical interface (2) and via the second electrical interface (3). Contacting device (1) according to Claim 1 , Wherein the first external electrical interface (2) has a reversible, in particular mechanically secured against unwanted release, plug-in device. Contacting device (1) according to Claim 1 or 2 further comprising a capacitor (8) arranged to protect the balancing resistor (4) from electrostatic discharge. Contacting device (1) according to one of the preceding claims, wherein the contacting device (1) - Electrical conductors (9) and / or - A punched grid for electrical connection - the first electrical interface with the balancing resistor (4) and - the second electrical interface with the balancing resistor (4) and - The first electrical interface (2) with the second electrical interface (3). Contacting device (1) according to one of the preceding claims, wherein the contacting device (1) is arranged to be arranged on electrical contacts of electrochemical storage cells of an electrochemical energy store (6) of the energy storage system (100). Contacting device (1) according to one of the preceding claims, which is designed as an electrically passive element. Electrochemical energy store (6) comprising - electrochemical storage cells, - a balancing resistor (4) and an external third interface (11) which is set up a respective electrical characteristic of two of the electrochemical storage cells leading to the outside, - To connect the balancing resistor (4) with one of the electrochemical storage cells for the purpose of charge compensation and / or - To lead a current for charge compensation from one of the electrochemical storage cells by the balancing resistor (4) flowing current to the outside. Cell controller (5) for an electrical energy storage system (100) comprising - An evaluation unit (13), and a fourth electrical interface (12) which is set up - To lead a respective electrical characteristic of two of the electrochemical storage cells to the evaluation unit (13), and to switch, in particular lead, a current flowing through an external balancing resistor (4) for charge equalization of an electrochemical storage cell. Contacting device (1) according to one of the preceding Claims 1 to 6 , Electrochemical energy storage (6) after Claim 7 or cell controller (5) after Claim 8 wherein the interface (2, 3, 11, 12) - a plug connection and / or - flat contacts and / or - a solder connection and / or - a smd connection and / or - a crimp connection comprises. Energy storage system comprising - a contacting device (1), in particular according to one of the preceding Claims 1 to 6 or 9 , and - an electrochemical energy store (6), in particular according to one of the preceding Claims 7 or 9 , and / or - a cell controller (5), in particular according to one of the preceding Claims 8 or 9 in which - the cell controller (5) is arranged to conduct a balancing current through the balancing resistor (4) and the memory cell in response to detecting a charge balance requirement of an electrical memory cell in the electrochemical energy store (6). Means of transport comprising an energy storage system (100) according to Claim 10 ,

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