CELL CONNECTORS FOR CELLS AND CELL MODULES AND BATTERY MODULES WITH CELLS

Description

[0001] The invention relates to cell connectors for electrically connecting a first and a second cell. Specifically, a cell connector for electrically connecting the first and second cells in parallel and a cell connector for electrically connecting the first and second cells in series. The preamble of claims 1 and 7, which each relate to a cell connector, is based on EP 3 018 732.

[0002] The invention further relates to a cell module having at least two cells and at least one cell connector, wherein the at least two cells are electrically interconnected by the at least one cell connector. Furthermore, the invention relates to a battery module having at least two cell modules.

[0003] A cell comprises an electrical energy storage device and a hollow cylindrical housing. The electrical energy storage device is arranged in the housing, and the housing tightly encloses the electrical energy storage device. The electrical energy storage device has a first energy storage terminal and a second energy storage terminal. The housing has an outer casing, an inner casing, a first cap, and a second cap.

[0004] The cell housing is in the shape of a hollow cylinder. A hollow cylinder is generally understood to be a hollow cylinder. A general hollow cylinder is defined by an outer surface, inner surface, a first base surface, and a second base surface, with the base surfaces closing off the areas between the inner surface and outer surface. A general hollow cylinder can be not only vertical but also oblique. It can also have base surfaces with not only circular or oval but also polygonal cross-sectional contours. In particular, the hollow cylindrical housing can also be a prism. In the housing, the outer shell forms the outer surface, the inner shell forms the inner surface, the first cap forms the first base surface, and the second cap forms the second base surface.

[0005] The housing tightly encloses the electrical energy storage device located inside the housing. "Tightly enclosed" means, on the one hand, that the electrical energy storage device is protected from environmental influences, so that its functionality is not impaired, and, on the other hand, that the electrical energy storage device poses no environmental hazards.

[0006] The two energy storage poles of the electrical energy storage device are also called the positive pole and the negative pole.

[0007] One cell or several electrically interconnected cells are used to supply electrical devices with electrical energy. These electrical devices include smartphones, laptops, and automobiles.

[0008] Examples of cells of this type known in practice include lithium-ion round cells. Such a round cell has a vertical, hollow-cylindrical housing with an inner shell and an outer shell, the inner shell and the outer shell having circular cross-sectional contours. The two caps are adapted to the inner shell and the outer shell. The electrical energy storage device is arranged in the housing and is often wound around the inner shell. The first energy storage pole of the electrical energy storage device is electrically connected to the first cap, and the second energy storage pole is electrically connected to the second cap. Electrical contact between the cells is therefore only made via the two caps, with one cap representing the negative pole and the other cap the positive pole.

[0009] Several cells of this generic type can be electrically connected in series or in parallel. For electrically serially connecting a first and a second cell, these are preferably also arranged geometrically in series, so that the first cap of the first cell and the second cap of the second cell lie opposite one another. The first cap and the second cap are electrically connected to one another by a cell connector. For electrically parallelly connecting a first and a second cell, these are preferably also arranged geometrically in parallel, so that the first cap of the first cell and the first cap of the second cell lie next to one another. The first two caps are electrically connected to one another by a cell connector. Although other geometric arrangements of cells for electrically serial or parallel connection are also known, these require more complex cell connectors.Thus, the type of electrical interconnection of cells influences their geometric arrangement and the orientation of the cells within this arrangement. This results in a loss of symmetry and reduces the packing density of the cells. The orientation of cells refers to the sequence of their caps relative to each other, i.e., the sequence of the positive and negative poles. This is a limitation that represents a disadvantage.

[0010] The temperature of the electrical energy storage device in a cell must be within a specified temperature range to ensure maximum performance and maximum service life. However, heat is generated in the electrical energy storage device during charging and discharging. The current flowing during charging and discharging also generates heat in the areas of the housing and cell connectors through which the current flows. These areas include, in particular, the electrical contact points between the cell housings and the cell connectors. The ambient temperature of cells and the heat generated during charging and discharging can cause the temperature to deviate from the specified range. If the temperature rises so far that it lies outside the specified temperature range, there is a risk of thermal runaway.Therefore, it is necessary to temperature-control cells so that the temperature of the electrical energy storage device remains within the specified temperature range. A lack of temperature control, or a temperature control that does not keep the electrical energy storage device within the specified temperature range, represents a further disadvantage.

[0011] In the cell for use with the cell connectors, the inner jacket and the first cap form a first electrical cell conductor, and the outer jacket and the second cap form a second electrical cell conductor. The first electrical cell conductor and the second electrical cell conductor are electrically insulated from one another. Furthermore, the first energy storage pole and the inner jacket, and the second energy storage pole and the outer jacket, are electrically connected to one another. The inner jacket has a first socket on the first cap and a second socket on the second cap for plugs of a cell connector. The sockets are preferably of different sizes to prevent polarity reversal. Furthermore, the housing is designed such that a medium for temperature control of the cell can be accommodated in the inner jacket.

[0012] The hollow cylindrical shape of the housing, combined with the assignment of the housing elements—namely the outer shell, the inner shell, the first cap, and the second cap—to the first electrical cell conductor and second electrical cell conductor, and the electrical connection of the inner shell to the first energy storage pole and the connection of the outer shell to the second energy storage pole, enable, with appropriate cell connectors, both an electrical series connection and an electrical parallel connection of two geometrically serially arranged cells, regardless of their orientation. The orientation of the cells refers to the sequence of their caps relative to one another in the geometrically serial arrangement, i.e., the sequence of first and second caps.

[0013] The housing, and thus the inner casing, is designed to accommodate a medium for controlling the temperature of the cell. If a medium is accommodated in the inner casing, it serves to supply or dissipate heat, ensuring that the electrical energy storage device remains within the specified temperature range. The electrical energy storage device is usually arranged directly on the inner casing. This minimizes the thermal resistance between the electrical energy storage device and the inner casing, enabling efficient temperature control. Preferably, the outer casing and the caps are also arranged on the energy storage device, so that the thermal resistance is as low as possible.

[0014] The cell's housing is also characterized by its simplicity. The housing components—namely, the outer shell, the inner shell, the first cap, and the second cap—are easy to manufacture and assemble. This reduces manufacturing effort and costs.

[0015] The energy storage device in the cell is usually layered, for example by folding it in on itself or by winding it around the inner casing. The energy storage device therefore has layers. In this respect, the energy storage device resembles a coil. Consequently, the energy storage device also has a corresponding inductance, which affects transient changes in a current through the energy storage device. Therefore, in one embodiment of the cell, it is provided that, on the one hand, the first energy storage pole and the first cap and, on the other hand, the second energy storage pole and the second cap are electrically connected to one another. Thus, on the one hand, the inner casing and the first cap and, on the other hand, the first energy storage pole are electrically connected, and on the other hand, the outer casing and the second cap and, on the other hand, the second energy storage pole are electrically connected.The electrical connection between the first energy storage pole and the first cap is such that the first energy storage pole, preferably at each layer of the energy storage device, and the first cap are electrically connected to one another. Correspondingly, the electrical connection between the second energy storage pole and the second cap is such that the second energy storage pole, preferably at each layer of the energy storage device, and the second cap are electrically connected to one another. This connection of the layers of the energy storage device results in an electrical parallel connection between the layers, thereby reducing the inductance of the energy storage device. The additional electrical connections also reduce both the electrical and thermal resistance, and increase the maximum current.

[0016] In a further embodiment of the cell, the housing is designed such that a medium for controlling the temperature of the cell can flow through the inner casing. This medium is preferably a liquid medium. A liquid medium is characterized by, on the one hand, having a high heat capacity and, on the other hand, being in direct contact with the inner casing, so that the thermal resistance between the medium and the inner cavity is low. One advantage of a liquid medium over a solid medium is that heat added to or removed from the electrical energy storage device is transported not only by the thermal conductivity of the medium, but also by the movement of the flowing medium.

[0017] The first socket and the second socket in the inner casing of the housing are designed to accommodate plugs of cell connectors. In a further embodiment of the cell, it is provided that the first socket and / or the second socket are designed for plugging, screwing, gluing, soldering, welding, crimping or pressing a plug of a cell connector. An advantage of screwing and plugging compared to gluing, soldering, welding, crimping and pressing is that these connections are easier to separate. An advantage of gluing, soldering, welding, crimping and pressing compared to plugging and screwing is that these connections usually have a lower electrical resistance.

[0018] The cell housing can accommodate a variety of electrical energy storage devices. In one embodiment of the cell, the electrical energy storage device is a lithium-ion, sodium-ion, manganese-ion, magnesium-ion, or lithium-sulfur energy storage device. Alternatively, the electrical energy storage device can also be a capacitor such as a supercapacitor. A supercapacitor is, for example, a double-layer capacitor, pseudocapacitor, or hybrid capacitor.

[0019] The housing with outer shell, inner shell, first cap, and second cap can have a wide variety of hollow cylindrical geometries. In one embodiment, the inner shell has a circular cross-sectional contour. In another embodiment, the outer shell has a circular cross-sectional contour. In an alternative embodiment to the preceding embodiment, the outer shell has a polygonal cross-sectional contour.

[0020] To further simplify production and consequently further reduce manufacturing costs, a further embodiment provides for the first electrical cell conductor to be integral and made from a single piece. A further embodiment, which has the same objective as the previous one, provides for the second electrical cell conductor to be integral and made from a single piece.

[0021] In a further embodiment, the housing, preferably the outer casing, has a predetermined breaking point, so that the housing breaks at the predetermined breaking point when the energy storage device exerts a predetermined force on the predetermined breaking point. The energy storage device exerts such a force on the predetermined breaking point, for example, when it thermally breaks, for example, as a result of an electrical overload.

[0022] The object of the present invention is to overcome or at least mitigate the disadvantages described.

[0023] The problem is solved, on the one hand, by a cell connector for electrical parallel connection with the features of patent claim 1. The cell connector has a first electrical connecting conductor, a second electrical connecting conductor and a connecting insulator and is designed to be arranged between a cap of a first cell and a cap of a second cell. On the one hand, the first electrical connecting conductor and the connecting insulator and, on the other hand, the second electrical connecting conductor and the connecting insulator are connected to one another, such that the first electrical connecting conductor and the second electrical connecting conductor are electrically insulated from one another. The first electrical connecting conductor has a first plug and a second plug, the first plug being designed to be complementary to a socket of the first cell and the second plug being designed to be complementary to a socket of the second cell.The first electrical connection conductor is configured to electrically connect the socket of the first cell and the socket of the second cell, and the second electrical connection conductor is configured to electrically connect the second electrical cell conductor of the first cell and the second electrical cell conductor of the second cell. The first electrical connection conductor, including the first plug and the second plug, is configured to accommodate a medium for temperature control of cells.

[0024] A first and a second cell are electrically connected in parallel by the cell connector and arranged geometrically in series with one another by inserting the first plug of the cell connector into one of the sockets of the first cell and the second plug into a socket of the second cell. The first plug makes electrical contact with the first electrical cell conductor of the first cell via the socket and the second plug makes electrical contact with the first electrical cell conductor of the second cell via the socket, whereby the first electrical connecting conductor electrically connects the first electrical cell conductors of the two cells. The second electrical connecting conductor makes contact with both the second electrical cell conductor of the first cell and the second electrical cell conductor of the second cell, preferably in each case on the outer jacket.Accordingly, the cell connector is designed not only for electrical interconnection, but also for the mechanical connection of two cells. The electrical parallel connection of the two cells is independent of their orientation relative to each other.

[0025] The design of both the cell housing and the cell connectors to accommodate the same medium ensures efficient transport of heat to temper the cell.

[0026] In one embodiment of the cell connector for electrical parallel connection, the first electrical connecting conductor, including the first plug and the second plug, is designed for the flow of a medium for temperature control of the cells. The medium is preferably liquid. Such a medium is characterized by having a high heat capacity and being in direct contact with the first electrical connecting conductor, so that the thermal resistance between the medium and the electrical connecting conductor is low.

[0027] In a further embodiment of the cell connector for electrical parallel connection, the first electrical connecting conductor is a hollow cylinder with a collar, and the first plug and the second plug are formed on the hollow cylinder. Furthermore, the second electrical connecting conductor is a ring. The connecting insulator is arranged directly around the hollow cylinder and directly on the collar. The second electrical connecting conductor is arranged directly around the connecting insulator. This embodiment is characterized by a small number of components, namely essentially the hollow cylinder with collar, the ring, and the connecting insulator. Furthermore, these components have simple geometric shapes. This keeps manufacturing effort and costs low.

[0028] In a further embodiment of the cell connector for electrical parallel connection, it is provided that the first electrical connecting conductor and / or the second electrical connecting conductor and / or the connecting insulator are made in one piece and from a single piece. By manufacturing the first and / or second electrical connecting conductor and / or the connecting insulator from a single piece, manufacturing effort and costs are also kept low.

[0029] In a further embodiment of the cell connector for electrical parallel connection, the connection insulator comprises connecting means for connecting to the first electrical connecting conductor and / or the second electrical connecting conductor, and the first electrical connecting conductor and / or the second electrical connecting conductor are configured to complement the connecting means. The configuration of the connecting means in the connection insulator further simplifies production and reduces manufacturing costs, since no separate connecting means are required. The complementary configuration ensures a precise fit of the components.

[0030] In a further embodiment of the cell connector for electrical parallel connection, the connecting insulator is an injection-molded part. This embodiment is particularly preferred because the injection-molded part inherently features both the one-piece design and the formation of connecting means and the complementary design of the first and / or second electrical connecting conductor.

[0031] The problem is also solved by a cell connector for electrical series connection with the features of patent claim 7. The cell connector has an electrical connecting conductor, a first connecting insulator, a second connecting insulator, and a connecting element, and is designed to be arranged between a cap of a first cell and a cap of a second cell. On the one hand, the electrical connecting conductor and the first connecting insulator, and on the other hand, the connecting element and the first connecting insulator are connected to one another, so that the electrical connecting conductor and the connecting element are electrically insulated from one another. The electrical connecting conductor is connected to the second connecting insulator.The electrical connecting conductor has a first plug, and the connecting element has a second plug, wherein the first plug is complementary to a socket of the first cell and the second plug is complementary to a socket of the second cell. The electrical connecting conductor is designed to electrically connect the socket of the first cell and the second electrical cell conductor of the second cell. The electrical connecting conductor, including the first plug, the first connection insulator, and the connecting element, including the second plug, are designed to accommodate a medium for temperature control of cells.

[0032] A first and a second cell are electrically connected in series with one another by the cell connector and arranged geometrically in series with one another by inserting the first plug of the cell connector into one of the sockets of the first cell and the second plug into a socket of the second cell. The first plug makes electrical contact with the first electrical cell conductor of the first cell via the socket. Since the first plug is part of the electrical connecting conductor and the electrical connecting conductor also electrically contacts the second electrical cell conductor, preferably on the outer jacket, of the second cell, the electrical connecting conductor electrically connects the first electrical cell conductor of the first cell with the second electrical cell conductor of the second cell. The cell connector is therefore designed not only for the electrical interconnection but also for the mechanical connection of two cells.The electrical series connection of the two cells is independent of the orientation of the two cells to each other.

[0033] In one embodiment of the cell connector for electrical series connection, the electrical connecting conductor, including the first connector, the first connecting insulator, and the connecting element, including the second connector, are designed for the flow of a medium for temperature control of cells. The medium is preferably liquid and preferably an electrical insulator. Such an insulator is characterized by having a high heat capacity and being in direct contact with the first electrical connecting conductor, so that the thermal resistance between the medium and the electrical connecting conductor is low.

[0034] In a further embodiment of the cell connector for electrical series connection, it is provided that both the first connection insulator and the second connection insulator are each a ring, that the electrical connecting conductor is a hollow cylinder with a pot-shaped collar, the collar has a first collar side and a second collar side, the first plug is formed on the hollow cylinder, the first collar side is arranged directly on the first connection insulator and the second collar side is arranged directly on the second connection insulator and that the connecting element is a hollow cylinder with a collar, the second plug is formed on the hollow cylinder and the collar is arranged directly on the first connection insulator. This embodiment is characterized by a small number of components, namely essentially the two rings and the two hollow cylinders with collars.Furthermore, these components feature simple geometric shapes, which minimizes manufacturing effort and costs.

[0035] In a further embodiment of the cell connector for electrical series connection, it is provided that the electrical connecting conductor and / or the connecting element and / or the first connecting insulator and / or the second connecting insulator are / is made in one piece and from a single piece. By manufacturing the electrical connecting conductor and / or the connecting element and / or the first connecting insulator and / or the second connecting insulator from a single piece, manufacturing effort and costs are also kept low.

[0036] In a further embodiment of the cell connector for electrical series connection, it is provided that the first connection insulator has connecting means for connecting to the connecting element and / or the electrical connecting conductor and / or that the second connection insulator has connecting means for connecting to the electrical connecting conductor, and that the connecting element and / or the electrical connecting conductor are designed to be complementary to the connecting means. The design of the connecting means in the first and / or second connection insulator leads to a further simplification of production and a reduction in production costs, since no separate connecting means are required. The complementary design means a precise fit of the components.

[0037] In a further embodiment of the cell connector for electrical series connection, the first connection insulator and / or the second connection insulator are / is an injection-molded part. This embodiment is particularly preferred because the injection-molded parts inherently feature both a one-piece construction and the formation of connecting means and a complementary design to the connected components.

[0038] The cell connector for electrical parallel connection and the cell connector for electrical series connection also have common configurations. Such common configurations are referred to as cell connectors, which refers to both the cell connector for electrical parallel connection and the cell connector for electrical series connection.

[0039] In one embodiment of the cell connector, the cell connector is designed to seal between the cap of a first cell and the cap of a second cell. The sealing design ensures that, when a first cell and a second cell are mechanically connected to one another by the cell connector, a liquid and / or gaseous medium can flow from the first cell to the second cell without loss.

[0040] In a further development of the above embodiment of the cell connector for electrical parallel connection, the connection insulator comprises sealing means for sealing. When a first and a second cell are mechanically connected to one another by the cell connector, the sealing is provided by the sealing means between the connection insulator and the cell caps. The sealing means are therefore separate components and arranged on opposite sides of the connection insulator. The sealing means are, for example, seals made of an elastic material, and grooves for receiving the seals are provided in the sides of the connection insulator.

[0041] In a further development of the above embodiment of the cell connector for electrical series connection, it is provided that the first connection insulator and the second connection insulator have sealing means for sealing. If a first and a second cell are mechanically connected to one another by the cell connector, then the sealing takes place on the one hand by one of the sealing means between the first connection insulator and one of the caps of the first cell and on the other hand by one of the sealing means between the second connection insulator and one of the caps of the second cell. The sealing means are therefore separate components and arranged on the side of the respective connection insulator facing a cap. The sealing means are, for example, seals made of an elastic material and, for example, grooves for receiving the seals are provided in the respective sides of the connection insulators.

[0042] In a further embodiment of the cell connector, it is provided that there are radially running recesses in the cell connector so that when a medium for temperature control of cells flows through the cell connector, part of the medium flows through the radially running recesses. When a first and a second cell are mechanically connected to one another by the cell connector, the cell connector has electrical contacts to the cells. Since electrical contacts usually have a higher electrical resistance than the electrical conductors they connect, a current flowing through the electrical contacts generates more heat in the electrical contacts than in the electrical conductors. The medium transports the heat generated in the electrical contacts away through the radially running recesses.

[0043] In a cell connector for electrical parallel connection, in which the first electrical connecting conductor is a hollow cylinder with a collar, the first plug and the second plug are formed on the hollow cylinder and the connecting insulator is arranged directly around the hollow cylinder and directly on the collar and in which the second electrical connecting conductor is a ring and is arranged directly around the connecting insulator, it is provided in a development of the above embodiment that the recesses are formed in the hollow cylinder and in the ring and in the collar and / or in the connecting insulator.

[0044] In a cell connector for electrical series connection, in which both the first connection insulator and the second connection insulator are a ring, the electrical connection conductor is a hollow cylinder with a pot-shaped collar, the collar has a first collar side and a second collar side, the first plug is formed on the hollow cylinder, the first collar side is arranged directly on the first connection insulator and the second collar side is arranged directly on the second connection insulator and the connecting element is a hollow cylinder with a collar, the second plug is formed on the hollow cylinder and the collar is arranged directly on the first connection insulator, a development of the above embodiment provides that the recesses are formed in the hollow cylinder of the electrical connection conductor and in the collar and / or in the second connection insulator.

[0045] In an alternative or additional development to the above development, it is provided that the recesses are formed in the first connection insulator and / or in the collar of the electrical connection conductor.

[0046] The object is also achieved by a cell module having the features of patent claim 20. The cell module has at least two cells and at least one of the previously described cell connectors. The at least two cells are connected to one another by the at least one cell connector.

[0047] In one embodiment of the cell module, it is provided that the cell module has a module housing with a module interior, a module longitudinal axis, and an inner cross-sectional contour of the module interior, such that the inner cross-sectional contour is adapted to the outer shells of the at least two cells such that the at least two cells and the at least one cell connector can be inserted into the module interior, the at least two cells are positioned radially to the module longitudinal axis in the module interior, and a medium for temperature control of cells can be accommodated between, on the one hand, the outer shells of the at least two cells and the at least one cell connector and, on the other hand, the module interior. The cell module thus arranges the cells geometrically in series.Two consecutive cells in the cell module are electrically connected in parallel by a cell connector for electrical parallel connection between these cells, or electrically connected in series by a cell connector for electrical series connection between these cells. In this configuration, the electrical energy storage devices in the cells are temperature-controlled at least from the inner and outer casings. Additionally, the previously described radial recesses in the cell connector are also useful for further improving the temperature control of the electrical energy storage devices and the electrical contacts.

[0048] In a further development of the above-mentioned cell module configuration, a medium for temperature control of the cells can flow between, on the one hand, the outer casings of the at least two cells and the at least one cell connector, and, on the other hand, the module interior. The medium is preferably liquid. Such a medium is characterized by having a high heat capacity and being in direct contact with the second electrical connecting conductor, so that the thermal resistance between the medium and the second electrical connecting conductor is low.

[0049] In a further embodiment of the cell module, the module housing is electrically conductive, the at least two cells are electrically connected in parallel by the at least one cell connector, and the outer casings of the at least two cells are electrically connected to one another by the module interior. The additional electrical connection of the outer casings of the cells by the module housing reduces the electrical resistance for an electrical current flowing through the cells.

[0050] In a further embodiment of the cell module, which is an alternative to the previously described embodiment, it is provided that the module housing is electrically insulating in the module interior and that the at least two cells are electrically connected in series by the at least one cell connector.

[0051] In a further embodiment of the cell module, the interior cross-sectional area is provided with ribs. These ribs are therefore longitudinal ribs with respect to the module's longitudinal axis. The upper ends of the ribs position the cells radially to the module's longitudinal axis within the module's interior. Furthermore, the ribs provide a cross-sectional area that allows for the inclusion of a medium for temperature control of the cells. A liquid medium is particularly suitable. The ribs also increase the surface area of ​​the module housing, allowing for better heat transfer from the medium to the module housing.

[0052] In a further embodiment of the cell module, access points for measuring cell voltages and / or temperatures are provided in the module housing. Since the properties of electrical energy storage devices in cells are not identical due to manufacturing tolerances, monitoring the voltages and / or temperatures of individual cells in the module housing is recommended. The voltage and temperature represent the status of a cell. The access points are sealed so that a temperature-regulating medium cannot escape from the module housing.

[0053] The object is also achieved by a battery module having the features of patent claim 27. The battery module has at least two of the cell modules described above.

[0054] In the context of the invention, an electrical connection always means an electrically conductive connection and an electrical contact means an electrically conductive contact.

[0055] In detail, there are numerous possibilities for designing and developing the cell connectors, the cell module, and the battery module. Reference is made to the claims subordinate to the independent patent claims as well as to the following description of preferred embodiments in conjunction with the drawing. The drawing shows an abstract Fig. 1a, 1b show a first embodiment of a cell, Fig. 2 show a second embodiment of a cell, Fig. 3 show an electrical series connection of two cells according to the first embodiment by means of an embodiment of a cell connector for electrical series connection, Fig. 4a-4c show the embodiment of a cell connector for electrical series connection, Fig. 5 show an electrical parallel connection of two cells according to the first embodiment by means of a first embodiment of a cell connector for electrical parallel connection, Fig. 6a-6c show the embodiment of a cell connector for electrical parallel connection, Fig. 7a-7c show a further embodiment of a cell connector for electrical parallel connection, Fig. 8a-8b show an embodiment of a cell module and Fig. 9a-9b show an embodiment of a battery module.

[0056] Fig. 1a shows a first embodiment of a cell 1 in perspective view and Fig. 1b A longitudinal section of the exemplary embodiment. The cell has an electrical energy storage device 2 and a vertical, hollow-cylindrical housing 3.

[0057] The housing 3 has an outer shell 4, an inner shell 5, a first cap 6, and a second cap 7. Both the outer shell 4 and the inner shell 5 each have a circular cross-sectional contour. A first electrical cell conductor 8 is formed by the inner shell 5 and the first cap 6, and a second electrical cell conductor 9 is formed by the outer shell 4 and the second cap 7. Both the first electrical cell conductor 8 and the second electrical cell conductor 9 are each made integrally from a single piece and are electrically conductive. The first electrical cell conductor 8 and the second electrical cell conductor 9 are electrically insulated from one another.

[0058] The one-piece construction of the first cell conductor 8 and the second cell conductor 9 simplifies the manufacture of the cell 1, which also reduces manufacturing costs. In addition, by assigning the first cap 6 to the inner sheath 5 on the one hand and the second cap 7 to the outer sheath on the other hand, joining the first cell conductor 8 and the second cell conductor 9 is simplified to simply inserting the first cell conductor 8 into the second cell conductor 9. A further simplification is provided by the fact that the electrical energy storage device 2 is wound onto the inner sheath 5. Preferably, the inner sheath 5 is used as a winding mandrel for winding the electrical energy storage device 2. Individual energy storage layers of the energy storage device 2 are shown, for example, in the lower half of Fig. 1b shown.

[0059] The inner casing 5 has, on one side, i.e., at the level of the first cap 6, a first socket 10, and on the other side, i.e., at the level of the second cap 7, a second socket 11 for the plug of a cell connector. The first socket 10 and the second socket 11 are identical and designed for plugging in the plug of a cell connector.

[0060] The electrical energy storage device 2 is a lithium-ion energy storage device and has a first energy storage pole 12 and a second energy storage pole 13. The electrical energy storage device 2 is arranged in the housing 3.

[0061] On the one hand, the first energy storage pole 12 and the first electrical cell conductor 8, and on the other hand, the second energy storage pole 13 and the second electrical cell conductor 9 are electrically connected to one another. Accordingly, on the one hand, the inner casing 5 and the first cap 6, and on the other hand, the first energy storage pole 12 are electrically connected, and on the other hand, the outer casing 4 and the second cap 7, and on the other hand, the second energy storage pole 13, are electrically connected. The electrical connection between the first energy storage pole 12 and the first cap 6 is such that the first energy storage pole 12, preferably at each energy storage layer of the electrical energy storage device 2, and the first cap 6 are electrically connected to one another.An electrical connection to the cell 1 can thus be established via the first cell conductor 8, i.e., the first cap 6 and the inner sheath 5, and via the second cell conductor 9, i.e., the outer sheath 4 and the second cap 7. It should be noted that the first socket 10 and the second socket 11 belong to the inner sheath 5.

[0062] The temperature of the electrical energy storage device 2 in the cell 1 must lie within a predetermined temperature range to ensure the maximum possible performance of the electrical energy storage device 2 and to achieve its maximum possible service life. The ambient temperature of the cell 1 and the heat generated in the electrical energy storage device 2 during charging and discharging can cause the temperature to exceed the predetermined range. Consequently, it is necessary to temperature-control the cell 1 so that the temperature of the electrical energy storage device 2 lies within the predetermined temperature range. For this reason, the housing 3 is designed such that a liquid medium for temperature-controlling the cell 1 can flow through the inner casing 7.A liquid medium is characterized by the fact that it has a high heat capacity and is in direct contact with the inner jacket 5, so that the thermal resistance between the medium and the inner jacket 5 is low.

[0063] Furthermore, the housing 3 tightly encloses the electrical energy storage device 2. "Tightly enclosed" means, on the one hand, that the electrical energy storage device 2 is protected against environmental influences, so that its functionality is not impaired, and, on the other hand, that the electrical energy storage device 2 poses no environmental hazards. The tight enclosure also applies to the medium, so that the medium cannot penetrate into the housing 3.

[0064] Fig. 2 shows a second embodiment of a cell 1 in perspective view. The second embodiment differs from the first embodiment only in that the outer casing 4 has a rectangular, rather than a circular, cross-sectional contour. Otherwise, the statements regarding the first embodiment apply accordingly to the second embodiment.

[0065] Fig. 3 shows a longitudinal section of an electrical series connection of two cells 1 according to the first embodiment through an embodiment of a cell connector 14 for the electrical series connection. The two cells 1 are geometrically arranged in series, and the cell connector 14 is arranged between the left cell 1 and the right cell 1.

[0066] Fig. 4a shows the cell connector 14 for electrical series connection from Fig. 3 separately in perspective view. Fig. 4b shows the components of the cell connector 14 pulled apart along its longitudinal axis. Fig. 4c shows a longitudinal section of the cell connector 14.

[0067] The cell connector 14 has an electrical connecting conductor 15, a first connection insulator 16, a second connection insulator 17 and a connecting element 18 and is designed to be arranged between the first cap 6 of the left cell 1 and the second cap 7 of the right cell 1.

[0068] The electrical connecting conductor 15, the connecting element 18, the first connecting insulator 16, and the second connecting insulator 17 are each integrally formed from a single workpiece. The electrical connecting conductor 15 and the first connecting insulator 16 are connected to one another, and the connecting element 18 and the first connecting insulator 16 are connected to one another, so that the electrical connecting conductor 15 and the connecting element 18 are electrically insulated from one another. The electrical connecting conductor 15 is connected to the second connecting insulator 17.

[0069] The electrical connecting conductor 15 has a first plug 19, and the connecting element 18 has a second plug 20. The first plug 19 is designed to complement the first socket 10 of the left cell 1, and the second plug 20 is designed to complement the second socket 11 of the right cell 1. The electrical connecting conductor 15 is designed to electrically connect the first socket 10 of the left cell 1 and the second electrical cell conductor 9 on the outer casing 4 of the right cell 1. The electrical connecting conductor 15, including the first plug 19, the first connection insulator 16, and the connecting element 18, including the second plug 20, are designed to accommodate a medium for tempering the cells 1.

[0070] The electrical connecting conductor 15 including the first plug 19, the first connecting insulator 16 and the connecting element 18 including the second plug 20 are designed for flow through with a medium for tempering the cells 1.

[0071] The left cell 1 and the right cell 1 are thus both electrically connected in series with one another and geometrically arranged in series with one another by the cell connector 14, in that the first plug 19 of the cell connector 14 is inserted into the first socket 10 of the left cell 1 and the second plug 20 is inserted into the second socket 11 of the right cell 1. The first plug 19 electrically contacts the first electrical cell conductor 8 of the left cell 1 via the first socket 10. Since the first plug 10 belongs to the electrical connecting conductor 15 and the electrical connecting conductor 15 also electrically contacts the second electrical cell conductor 9, preferably on the outer jacket 4, of the right cell 1, the electrical connecting conductor 15 electrically connects the first electrical cell conductor 8 of the left cell 1 to the second electrical cell conductor 9 of the right cell 1.Accordingly, the cell connector 14 is designed not only for electrical interconnection, but also for mechanical connection of two cells 1. The electrical series connection of the two cells 1 is independent of the orientation of the two cells 1 relative to each other.

[0072] Both the first connection insulator 16 and the second connection insulator 17 are rings. The electrical connection conductor 15 is a hollow cylinder with a cup-shaped collar. The collar has a first collar side 21 and a second collar side 22. The first plug 19 is formed on the hollow cylinder. The first collar side 21 is arranged directly on the first connection insulator 16 and the second collar side 22 is arranged directly on the second connection insulator 17. The connection element 18 is a hollow cylinder with a collar, although the collar is not cup-shaped. The second plug 20 is formed on the hollow cylinder. The collar of the connection element 18 is arranged directly on the first connection insulator 16.

[0073] The first connection insulator 16 has connecting means 23 for connecting to the connecting element 18 and the electrical connecting conductor 15. The second connection insulator 17 also has connecting means 23 for connecting to the electrical connecting conductor 15. The connecting element 18 and the electrical connecting conductor 15 are designed to complement the connecting means 23. The first connection insulator 16 and the second connection insulator 17 are each an injection-molded part. The connecting means 23 are projections which correspond to the recesses complementary to the projections and establish the connection so that these components are fixed to one another. The connection is created during the injection molding process of the injection-molded parts, since the electrical connecting conductor 15 and the connecting element 18 are part of the injection mold of the injection-molded parts.

[0074] The cell connector 14 is designed to seal between the first cap 6 of the left cell 1 and the second cap 7 of the right cell 1. For this purpose, the first connection insulator 16 has a sealant 24, and the second connection insulator 17 also has a sealant 24. The sealants 24 are gaskets made of an elastic material. To accommodate the sealant 24, both the first connection insulator 16 and the second connection insulator 17 each have a groove 25. For example, two-component injection molding technology is used, in which the soft component, i.e. the sealant 24, is injected directly into the hard component, i.e. the groove 25.

[0075] Fig. 5 shows a longitudinal section of an electrical parallel connection of two cells 1 according to the first embodiment through a first embodiment of a cell connector 26 for electrical parallel connection. The two cells 1 are geometrically arranged in series, and the cell connector 26 is arranged between the left cell 1 and the right cell 1.

[0076] Fig. 6a shows the cell connector 26 for electrical parallel connection of Fig. 5 separately in perspective view. Fig. 6b shows the components of the cell connector 26 pulled apart along its longitudinal axis. Fig. 6c shows a longitudinal section of the cell connector 26.

[0077] The cell connector 26 has a first electrical connecting conductor 27, a second electrical connecting conductor 28 and a connecting insulator 29 and is designed to be arranged between the first cap 6 of the left cell 1 and the second cap 7 of the right cell 1.

[0078] The first electrical connecting conductor 27, the second electrical connecting conductor 28, and the connecting insulator 29 are each integrally formed from a single piece. Firstly, the first electrical connecting conductor 27 and the connecting insulator 29, and secondly, the second electrical connecting conductor 28 and the connecting insulator 29 are connected to one another, such that the first electrical connecting conductor 27 and the second electrical connecting conductor 28 are electrically insulated from one another. The connecting insulator 29 is an injection-molded part, with the first electrical connecting conductor 27 and the second electrical connecting conductor 28 being parts of the injection mold of the connecting insulator 29.

[0079] The first electrical connecting conductor 27 has a first plug 19 and a second plug 20. The first plug 19 is designed to be complementary to the first socket 10 of the left cell 1, and the second plug 20 is designed to be complementary to the second socket 11 of the right cell 1. The first electrical connecting conductor 27 is designed to electrically connect the first socket 10 of the left cell 1 and the second socket 11 of the right cell 1. The second electrical connecting conductor 28 is designed to electrically connect the second electrical cell conductor 9 on the outer casing 4 of the left cell 1 and the second electrical cell conductor 9 on the outer casing 4 of the right cell 1. The first electrical connecting conductor 27, including the first plug 19 and the second plug 20, is designed to accommodate a medium for temperature control of cells 1.

[0080] The first electrical connecting conductor 27 including the first plug 19 and the second plug 20 are designed for flow through with a medium for tempering the cells 1.

[0081] Thus, the left cell 1 and the right cell 1 are both electrically connected in parallel and geometrically arranged in series with one another by the cell connector 26, in that the first plug 19 of the cell connector 26 is inserted into the first socket 10 of the left cell 1 and the second plug 20 is inserted into the second socket 11 of the right cell 1.

[0082] The first plug 19 makes electrical contact with the first electrical cell conductor 8 of the left cell 1 via the first socket 10, and the second plug 20 makes electrical contact with the first electrical cell conductor 8 of the right cell 1 via the second socket 11, whereby the first electrical connecting conductor 27 electrically connects the first electrical cell conductors 8 of the two cells 1. The second electrical connecting conductor 28 makes electrical contact with both the second electrical cell conductor 9 of the left cell 1 and the second electrical cell conductor 9 of the right cell 1, preferably in each case on the outer jacket 4. Accordingly, the cell connector 26 is designed not only for the electrical interconnection but also for the mechanical connection of two cells 1. The electrical parallel connection of the two cells 1 is independent of the orientation of the two cells 1 to one another.

[0083] The first electrical connecting conductor 27 is a hollow cylinder with a collar. The first plug 19 and the second plug 20 are formed on the hollow cylinder. Furthermore, the second electrical connecting conductor 28 is a ring. The connecting insulator 29 is arranged directly around the hollow cylinder and directly on the collar. The second electrical connecting conductor 28 is arranged directly around the connecting insulator 29.

[0084] The cell connector 26 is designed to seal between the first cap 6 of the left cell 1 and the second cap 7 of the right cell 1. For this purpose, the connection insulator 29 has sealing means 24. The sealing means 24 are gaskets made of an elastic material. The connection insulator 29 has two grooves 25 to accommodate the sealing means 24.

[0085] Fig. 7a bis 7b show a second embodiment of a cell connector 26 for electrical parallel connection. In detail, Fig. 7a the cell connector 26 in perspective view, Fig. 7b the components of the cell connector 26 are pulled apart along its longitudinal axis and Fig. 7c a longitudinal section of the cell connector 26.

[0086] In the following, only the differences between the cell connector according to the second embodiment and that of the first embodiment are explained.

[0087] Specifically, radially extending recesses 30 are formed in the hollow cylinder of the first electrical connecting conductor 27, in the annular second electrical connecting conductor 28 and in the connecting insulator 29, so that when a medium for tempering cells 1 flows through the cell connector 26, a part of the medium also flows through the radially extending recesses 30.

[0088] Fig. 8a shows an embodiment of a cell module 31 in perspective view and Fig. 8b a longitudinal section of the embodiment.

[0089] The cell module 31 has two cells 1, a cell connector 26, a module housing 32 with a module interior 33, a module longitudinal axis 34, and an inner cross-sectional contour 35 of the module interior 33. The inner cross-sectional contour 35 has longitudinal ribs and is adapted to the outer shells 4 of the two cells 1 such that the two cells 1 and the cell connector 26 can be inserted into the module interior 33 along the module longitudinal axis 34, the at least two cells 1 are positioned radially to the module longitudinal axis 34 in the module interior 33, and a medium for tempering the cells 1 can be accommodated between, on the one hand, the outer shells 4 of the two cells 1 and the cell connector 26 and, on the other hand, the module interior 33. For example, a liquid medium can flow between, on the one hand, the outer shells 4 of the two cells 1 and the cell connector, and, on the other hand, the module interior 33. The same medium can also flow through the inner shells 4.

[0090] Fig. 9a shows an embodiment of a battery module 36 in perspective view and Fig. 9b a longitudinal section of the embodiment.

[0091] The battery module 36 has a battery housing 37 with two cell modules 31 in its interior, a first battery terminal 38, and a second battery terminal 39. The cell modules 31 are electrically connected in parallel via the two battery terminals 38, 39. The first battery terminal 38 is the positive pole and the second battery terminal 39 is the negative pole. A medium for controlling the temperature of the cells 1 in the cell modules 31 can also flow through the battery terminals 38, 39. A medium can be supplied through the first battery terminal 38 and discharged through the second battery terminal 39. Bezugszeichen

[0092] 1 Cell 2 Electrical energy storage device 3 Housing 4 Outer sheath 5 Inner sheath 6 First cap 7 Second cap 8 First cell conductor 9 Second cell conductor 10 First socket 11 Second socket 12 First energy storage terminal 13 Second energy storage terminal 14 Cell connector for electrical series connection 15 Electrical connecting conductor 16 First connecting insulator 17 Second connecting insulator 18 Connecting element 19 First plug 20 Second plug 21 First collar side 22 Second collar side 23 Connecting means 24 Sealing means 25 Groove 26 Cell connector for electrical parallel connection 27 First electrical connecting conductor 28 Second electrical connecting conductor 29 Connecting insulator 30 Recess 31 Cell module 32 Module housing 33 Module interior 34 Module longitudinal axis 35 Internal cross-sectional contour 36 Battery module 37Battery housing 38First battery connection 39Second battery connection

Claims

1. Cell connector (26) for electrically connecting a first cell (1) and a second cell (1) in parallel with each other wherein each of the cells (1) has a hollow cylindrical housing (3), wherein the housing (3) has an outer casing (4), an inner casing (5), a first cap (6) and a second cap (7), wherein on the one hand the inner casing (5) and the first cap (6) form a first electrical cell conductor (8) and on the other hand the outer casing (4) and the second cap (7) form a second electrical cell conductor (9) and wherein the inner casing (5) has, on the one hand, a first socket (10) on the first cap (6) and, on the other hand, a second socket (11) on the second cap (7), characterized in that the cell connector (26) has a first electrical connecting conductor (27), a second electrical connecting conductor (28) and a connecting insulator (29), that the cell connector (26) is designed to be arranged between one of the caps (6, 7) of the first cell (1) and one of the caps (7, 6) of the second cell (1), that, on the one hand, the first electrical connecting conductor (27) and the connecting insulator (29) and, on the other hand, the second electrical connecting conductor (28) and the connecting insulator (29) are connected to one another, so that the first electrical connecting conductor (27) and the second electrical connecting conductor (28) are electrically insulated from one another, that the first electrical connecting conductor (27) has a first plug (19) and a second plug (20), that the first plug (19) is designed to complement one of the sockets (10, 11) of the first cell (1) and the second plug (20) is designed to complement one of the sockets (11, 10) of the second cell (1), that the first electrical connecting conductor (27) is designed to electrically connect the socket (10, 11) of the first cell (1) and the socket (11, 10) of the second cell (1) to one another, that the second electrical connecting conductor (28) is designed to electrically connect the second electrical cell conductor (9) of the first cell (1) and the second electrical cell conductor (9) of the second cell (1) to one another, and that the first electrical connecting conductor (27) including the first plug (19) and the second plug (20) is designed to receive a medium for temperature conditioning of cells (1).

2. Cell connector (26) according to claim 1, characterized in that the first electrical connecting conductor (27), including the first plug (19) and the second plug (20), is designed for the flow of a medium for temperature conditioning of cells (1).

3. Cell connector (26) according to claim 1 or 2, characterized in that the first electrical connecting conductor (27) is a hollow cylinder with a collar, the first plug (19) and the second plug (20) are designed on the hollow cylinder and the connecting insulator (29) is arranged directly around the hollow cylinder and directly on the collar, and that the second electrical connecting conductor (28) is a ring and is arranged directly around the connecting insulator (29).

4. Cell connector (26) according to any one of claims 1 to 3, characterized in that the first electrical connecting conductor (27) and / or the second electrical connecting conductor (28) and / or the connecting insulator (29) are or is made in one piece and from a single piece.

5. Cell connector (26) according to any one of claims 1 to 4, characterized in that the connecting insulator (29) has connecting means for connection to the first electrical connecting conductor (27) and / or the second electrical connecting conductor (28), and that the first electrical connecting conductor (27) and / or the second electrical connecting conductor (28) are designed to be complementary to the connecting means.

6. Cell connector (26) according to any one of claims 1 to 5, characterized in that the connection insulator (29) is an injection molded part.

7. Cell connector (14) for electrically connecting a first cell (1) and a second cell (1) in series with each other, wherein each of the cells (1) has a hollow cylindrical housing (3), wherein the housing (3) has an outer casing (4), an inner casing (5), a first cap (6) and a second cap (7), wherein, on the one hand, the inner casing (5) and the first cap (6) form a first electrical cell conductor (8) and, on the other hand, the outer casing (4) and the second cap (7) form a second electrical cell conductor (9) and wherein the inner casing (5) has on the one hand a first socket (10) on the first cap (6) and on the other hand a second socket (11) on the second cap (7), characterized in that the cell connector (14) has an electrical connecting conductor (15), a first connecting insulator (16), a second connecting insulator (17) and a connecting element (18), that the cell connector (14) is designed to be arranged between one of the caps (6, 7) of the first cell (1) and one of the caps (7, 6) of the second cell (1), that, on the one hand, the electrical connecting conductor (15) and the first connecting insulator (16) and, on the other hand, the connecting element (18) and the first connecting insulator (16) are connected to one another, so that the electrical connecting conductor (15) and the connecting element (18) are electrically insulated from one another, that the electrical connecting conductor (15) is connected to the second connecting insulator (17), that the electrical connecting conductor (15) has a first plug (19) and the connecting element (18) has a second plug (20), that the first plug (19) is designed to complement one of the sockets (10, 11) of the first cell (1) and the second plug (20) is designed to complement one of the sockets (11, 10) of the second cell (1), that the electrical connecting conductor (15) is designed to electrically connect the socket (10, 11) of the first cell (1) and the second electrical cell conductor (9) of the second cell (1) to one another, and that the electrical connecting conductor (15) including the first plug (19), the first connecting insulator (16) and the connecting element (18) including the second plug (20) are designed to receive a medium for temperature conditioning of cells (1).

8. Cell connector (14) according to claim 7, characterized in that the electrical connecting conductor (15) including the first plug (19), the first connecting insulator (16) and the connecting element (18) including the second plug (20) are designed for the flow of a medium for temperature conditioning of cells (1).

9. Cell connector (14) according to claim 7 or 8, characterized in that both the first connecting insulator (16) and the second connecting insulator (17) are a ring, that the electrical connecting conductor (15) is a hollow cylinder with a cup-shaped collar, the collar has a first collar side (21) and a second collar side (22), the first plug (19) is designed on the hollow cylinder, the first collar side (21) is arranged directly on the first connecting insulator (16) and the second collar side (22) is arranged directly on the second connecting insulator (17), and that the connecting element (18) is a hollow cylinder with a collar, the second plug (20) is designed on the hollow cylinder and the collar is arranged directly on the first connecting insulator (16).

10. Cell connector (14) according to any one of claims 7 to 9, characterized in that the electrical connecting conductor (15) and / or the connecting element (18) and / or the first connecting insulator (16) and / or the second connecting insulator (17) are or is made in one piece and from a single piece.

11. Cell connector (14) according to any one of claims 7 to 10, characterized in that the first connecting insulator (16) comprises connecting means for connection to the connecting element (18) and / or the electrical connecting conductor (15) and / or that the second connecting insulator (17) comprises connecting means for connection to the electrical connecting conductor (15) and that the connecting element (18) and / or the electrical connecting conductor (15) are designed to complement the connecting means.

12. Cell connector (14) according to any one of claims 7 to 11, characterized in that the first connecting insulator (16) and / or the second connecting insulator (17) is / are an injection-molded part.

13. Cell connector (14, 26) according to any one of claims 1 to 12, characterized in that the cell connector (14, 26) is designed for sealing between the cap (6, 7) of the first cell (1) and the cap (7, 6) of the second cell (1).

14. Cell connector (26) according to claim 13 and any one of claims 1 to 6, characterized in that the connection insulator (29) comprises sealing means (24) for sealing.

15. Cell connector (14) according to claim 13 and any one of claims 7 to 12, characterized in that the first connecting insulator (16) and the second connecting insulator (17) comprise sealing means (24) for sealing.

16. Cell connector (14, 26) according to any one of claims 1 to 15, characterized in that there are radially extending recesses (30) in the cell connector (14, 26), so that when a medium for temperature conditioning of cells (1) is made to flow through the cell connector (14, 26), part of the medium flows through the radially extending recesses (30).

17. Cell connector (26) according to claims 16 and 3, characterized in that the recesses (30) are designed in the hollow cylinder and in the ring and in the collar and / or in the connecting insulator (29).

18. Cell connector (14) according to claims 16 and 9, characterized in that the recesses (30) are designed in the hollow cylinder of the electrical connecting conductor (15) and in the collar and / or in the second connecting insulator (17).

19. Cell connector (14) according to claims 16 and 9, characterized in that the recesses (30) are designed in the first connecting insulator (16) and / or in the collar of the electrical connecting conductor (15).

20. Cell module (31) with at least two cells (1) and at least one cell connector (14, 26), wherein the at least two cells (1) are electrically interconnected by the at least one cell connector (14, 26), characterized in that the at least one cell connector (14, 26) is designed according to any one of claims 1 to 19.

21. Cell module (31) according to claim 20, characterized in that the cell module (31) has a module housing (32) with a module interior (33), a module longitudinal axis (34) and an inner cross-sectional contour (35) of the module interior (33), and that the inner cross-sectional contour (35) is adapted to the outer casings (4) of the at least two cells (1) in such a way that the at least two cells (1) and the at least one cell connector (14, 26) can be pushed into the module interior (33), the at least two cells (1) are positioned radially to the module longitudinal axis (34) in the module interior (33) and a medium for temperature conditioning of the cells (1) can be accommodated between, on the one hand, the outer casings (4) of the at least two cells (1) and the at least one cell connector (14, 26) and, on the other hand, the module interior (33).

22. Cell module (31) according to claim 21, characterized in that a medium for temperature conditioning of cells (1) can flow between, on the one hand, the outer casings (4) of the at least two cells (1) and the at least one cell connector (14, 26) and, on the other hand, the module interior (33).

23. Cell module (31) according to claim 21 or 22, characterized in that the module housing (32) is electrically conductive, that the at least two cells (1) are electrically connected in parallel by the at least one cell connector (26), and that the outer casings (4) of the at least two cells (1) are electrically connected to one another by the module interior (33).

24. Cell module (31) according to claim 21 or 22, characterized in that that the module housing (32) in the module interior (33) is electrically insulating, and that the at least two cells (1) are electrically connected in series by the at least one cell connector (14).

25. Cell module (31) according to any one of claims 21 to 24, characterized in that the inner cross-sectional contour (35) comprises ribs.

26. Cell module (31) according to any one of claims 20 to 25, characterized in that access for measuring voltages and / or temperatures of cells (1) is designed in the module housing (32).

27. Battery module with at least two cell modules (31), characterized in that at least one of the cell modules (31) is designed according to any one of claims 20 to 26.