Accumulator comprising at least one cylindrical battery cell

Abstract

The invention relates to an accumulator comprising: at least one cylindrical battery cell (2), which has an end face (3) with a central first contact surface (4) which forms a region of a first electrical pole (5) and with a second contact surface (7) which extends around the periphery of the end face (3) on the outside and which forms a region of a second electrical pole (6); and a printed circuit board (18) with which the at least one battery cell (2) is in contact on the end face (3) and which has resilient contact tongues (21, 22), and at least one resilient contact tongue (21, 22) is associated with the first and second contact surfaces (4, 7) of the at least one battery cell (2) and the contact tongues (21, 22) contact the first and second contact surfaces (4, 7) under spring tension.

Description

[0001] Accumulator with at least one cylindrical battery cell

[0002] The invention relates to a battery with at least one cylindrical battery cell.

[0003] Rechargeable batteries typically contain a large number of cylindrical battery cells of the 18650 or 21700 form factor. Several methods exist for electrically connecting these battery cells. Usually, the battery cells are contacted from both sides. The terminals of the battery cells are joined using nickel foils in a spot-welding process. Groups of cells connected in parallel are oriented in the same direction, while groups connected in series are alternately rotated by 180 degrees so that the positive terminal of one group can be connected to the negative terminal of the next group via the shortest possible path.

[0004] Wire bonding methods are also known, in which the battery cell is contacted on one side. These methods are disadvantageous in that the connection between the battery cell and the wires is a metallurgical bond, and if a battery cell fails, its replacement is unfortunately only possible with considerable manual labor. Furthermore, residues can be left behind, which make re-bonding more difficult.

[0005] From FR 3100929 B, a battery pack consisting of battery cells contacted from opposite sides is known. Conventional printed circuit boards are used, and spherical solder segments are formed on contact tongues. These segments are pressed onto the cells with a defined contact force, creating a positive connection that transmits sufficient current to drive the electrical load. The design is disadvantageous in that heat dissipation from the battery cells, which heat up over time, is primarily possible via the side walls of the battery cells, but no longer sufficiently via the end faces.

[0006] The object of the present invention is to provide an accumulator that reduces the aforementioned problems.

[0007] The task is accomplished by an accumulator having the features of claim 1.

[0008] The accumulator according to the invention has at least one cylindrical battery cell, which has an end face having a central first contact surface that forms a region of a first electrical pole and a second contact surface circumferentially around the outside of the end face, which forms a region of a second electrical pole and is connected to a contact plate with which the at least one battery cell is contacted at the end face and which has spring-elastic contact tongues and at least one spring-elastic contact tongue is assigned to the first and second contact surfaces of the at least one battery cell and the contact tongues contact the first and second contact surfaces under spring tension.

[0009] Advantageously, the invention can be applied to a single battery cell. The at least one battery cell is preferably rechargeable.

[0010] Preferably, the accumulator has a plurality of battery cells, each battery cell having an end face which has a central first contact surface forming a region of a first electrical pole and a second contact surface circumferentially surrounding the end face which forms a region of a second electrical pole and which has a contact plate with which the battery cells are contacted at the end face and the contact plate has spring-elastic contact tongues and at least one spring-elastic contact tongue is assigned to the first and second contact surfaces of at least some of the battery cells and the contact tongues contact the first and second contact surfaces under spring tension.

[0011] Thus, the battery can be adapted to different requirements in terms of its power, voltage and current.

[0012] Fortunately, the battery cells have the same design. This makes the battery simpler and cheaper to manufacture.

[0013] Preferably, the contact tongues form a friction-fit connection with the first and second contact surfaces. This means that the contact tongues press against the contact surface under spring force, but do not form a material bond with it. This friction-fit connection allows for easy maintenance of the accumulator, including the simple replacement of individual defective battery cells.

[0014] Preferably, the first electrical pole is a positive pole and the second electrical pole a negative pole. This embodiment corresponds to commercially available battery cells and is therefore cost-effective. Advantageously, the at least one battery cell has an end face and an opposite end face along a longitudinal dimension. The at least one battery cell can be of the 18650 or 21700 form factor. However, the invention is not limited to a specific size range for the battery cell or a particular form factor. The known forms 10440, 26650, and 4680 can also be used. Other forms are also conceivable for use in the invention.

[0015] The at least one battery cell preferably has a first and a second electrical pole, wherein the first electrical pole has a first contact area approximately centrally located on the end face of the battery cell, while the second electrical pole, although also formed on the opposite end face, also encompasses the casing of the battery cell as well as the second contact surface, which is arranged on the end face and surrounds the end face in a ring-like fashion. The second contact surface is advantageously a narrow annular strip that surrounds the end face and is arranged transversely to its longitudinal extent on the outside of one end face. In battery cells of type 21700, the first electrical pole is the positive pole and the second electrical pole is the negative pole, and this narrow annular strip has a radial width of only 2.7 mm ± 0.3 mm.

[0016] The term "end face" here refers to the circular top and bottom surfaces of the battery cell, which are visible when viewing the battery cell along its longitudinal axis. The end face is defined as the set of the outermost points of the battery cell along its longitudinal axis.

[0017] In this context, spring-elastic contact tongues are defined as contact tongues that have a neutral position located in the plane of the contact plate and can be elastically bent upwards and downwards along their longitudinal axis out of this neutral position, thereby generating a spring-elastic restoring force. Preferably, the contact tongue does not generate a restoring force in the neutral position. This spring-elastic restoring force is used to establish a frictional connection between the contact tongue and the positive or negative contact surface of the associated battery cell.

[0018] Advantageously, one or more contact tongues are formed as U-shaped, E-shaped, Q-shaped, H-shaped, double-L-shaped, or M-shaped cut lines from the contact board. The contact tongues are preferably formed in pairs. The contact tongues of a pair are arranged side by side and cut out of the contact board. The cutout in the contact board is preferably E-shaped. Of course, other cut line shapes such as double-U-shaped, double-Q-shaped, or M-shaped, etc., can also form one of the contact tongue pairs. Advantageously, the contact tongues are only connected to the contact board at one edge section, and otherwise approximately three-quarters of a circumferential edge of the contact tongue are cut out of the contact board and separated from the rest of the contact board by the cut line.

[0019] The spacing between the contact tongues can be chosen so that a separate cutout is not required for each contact tongue, but rather several contact tongues share a common cut in the circuit board, which saves space on the board and simplifies manufacturing. This is the case, for example, with E-shaped cut lines.

[0020] The contact board is usually a printed circuit board made of fiberglass, which, with a corresponding cutout as discussed above, acts as a mechanical spring and is printed with a conductive layer on one side, preferably on the side facing the battery cells.

[0021] Preferably, the first and second contact surfaces also form outermost surfaces along the longitudinal extent. They are arranged along and on the end face.

[0022] This design allows the first and second contact surfaces to be contacted by a defined contact force of at least one contact tongue, which is arranged along the longitudinal dimension above the end face of the battery cell and presses down on the end face of the battery cell from above along the longitudinal dimension, preferably exactly along the longitudinal dimension.

[0023] In a particularly preferred embodiment of the invention, conductive projections are arranged on one side of the contact tongues facing the battery cell. These projections, under spring force, establish contact, preferably a frictional contact, with the positive or negative contact surface. The conductive projections can preferably be spherical segment-shaped solder protrusions. Of course, other shapes of the protrusions are also conceivable.

[0024] The at least one battery cell and the contact plate are fixed in their operating position relative to each other. A raised section of the contact plate is designed such that the contact tongue is bent away from the battery cell along its longitudinal axis, thereby generating a spring-like force towards the end face of the battery cell. The distance the contact tongue is bent upwards is determined by the height of the raised section and the distance between the contact plate and the contact surface. The height of the raised section is specifically designed to ensure that the spring-like contact force is sufficient to allow adequate current flow between the contact tongue and the contact surface.

[0025] The first and second contact surfaces can have different heights along their longitudinal extension above the face. Higher contact surfaces project further from the face than lower contact surfaces. The higher contact surfaces can be configured as either first or second contact surfaces. Preferably, contact tongues with longer spring arms are assigned to the higher contact surfaces than to the lower contact surfaces. The length of the spring arm allows the contact force to be controlled, compensating for the different heights of the higher and lower contact surfaces and equalizing the contact force of the contact tongues on the contact surfaces.

[0026] Another way to equalize the contact pressure is to preferably assign contact tongues with higher elevations to the lower contact surfaces than to the higher contact surfaces.

[0027] Since the negative contact surface of at least one battery cell is particularly narrow, it is necessary that the associated contact tongue is positioned exactly opposite the negative contact surface in order to hit the first, and especially the second, contact surface as precisely as possible with the spring-elastic force.

[0028] Preferably, a cell positioner is provided in a section of the end face of the at least one battery cell, which brings the at least one battery cell to a defined position relative to the contact board and, in the case of multiple battery cells, preferably also holds the battery cells in position relative to each other. The cell positioner can be a single-piece component, in particular an injection-molded component.

[0029] The cell positioner may have openings through which contact tongues, each assigned to one of the battery cells, are guided onto the contact surfaces of the battery cell. Advantageously, each battery cell is assigned exactly one opening. The openings are preferably circular and have a constant inner diameter that corresponds exactly to the outer diameter of the battery cells in the section of the end face, so that the battery cells can be inserted through the opening with their upper section along the end face and are positioned securely within the cell positioner. Furthermore, the cell positioner has a circumferential outer rim whose circumferential shape corresponds exactly to the inner circumferential shape of an upper shell into which the cell positioner is inserted and is thus also positioned securely relative to the upper shell.

[0030] In a preferred embodiment of the invention, the cell positioner has three contact points per battery cell, preferably three pins arranged offset by 120°, which position the battery cell immovably.

[0031] In other embodiments of the invention, the cell positioner can comprise individual, separate cell positioner elements arranged on the side of the contact board facing the battery cells. These separate cell positioner elements can also be separate pins soldered to the contact board.

[0032] This is advantageous because the assembly can be integrated into the automated assembly process of the circuit board.

[0033] In a preferred embodiment, the two contact tongues associated with a battery cell are electrically isolated from each other in the contact board. This preferably prevents the battery cell from experiencing a short circuit.

[0034] In a preferred embodiment of the invention, a top plate has ribs arranged on the battery side for pressure distribution, with the battery cells and the contact board preferably being arranged in the top plate. The contact tongues in the contact board are preferably arranged in rows, and a free strip is formed between the rows of contact tongues, against which the ribs press. A free strip is understood to be a strip that is free of components, in particular electronic components, so that the rib can press against the free strip without impairing functionality. These are advantageously arranged side by side. The contact tongues are particularly preferably arranged in rows, with the rows being separated from one another by the free strip.The contact tongues of a battery cell can, for example, be arranged parallel to one another, with the contact tongues arranged in a precise row transverse to the longitudinal dimension. The connecting lines of the contact tongues with the rest of the contact plate form a precise line, and the two adjacent rows of contact tongues form the edges of the free strip. The free strip has a width approximately equal to the width of the ribs. The free strip is slightly wider than the rib, preferably one millimeter wider or more, so that in the operating position the ribs press against the free strip, thus ensuring that the contact plate experiences a defined contact pressure on the end faces of the battery cells across its entire surface. This results in all contact tongues exerting a spring-like force on the contact surfaces in the same manner.

[0035] Advantageously, the battery cells are arranged with their opposite ends facing each other on a base plate, and there is thermal coupling between the opposite ends and the base plate, which facilitates heat dissipation to the environment.

[0036] The opposite end face can be in direct contact with the base plate if the base plate is electrically insulating, or, if the base plate is electrically conductive, preferably spaced from the base plate by a thin, i.e., approximately 0.1 mm thick, electrically insulating layer, so that heat dissipation through the insulating layer is possible, but an electrical short circuit between the second contact surfaces of the battery cells is avoided. The base plate is preferably made of a thermally conductive material such as an aluminum die-cast part or similar. The electrically insulating layer is thermally conductive, which in this context means, for example, that it is formed by a rubber layer less than 0.1 mm thick.

[0037] The invention is described with reference to an exemplary embodiment in five figures, showing:

[0038] Fig. 1 shows an exploded view of an accumulator according to the invention.

[0039] Fig. 2a shows a sectional view of a battery cell of the accumulator in Fig. 1 ,

[0040] Fig. 2a shows a sectional view along line IIb - IIb, and Fig. 3 shows a top view of a configuration of contact tongues on a circuit board.

[0041] Fig. 4 shows a sectional view of an upper shell in Fig. 1.

[0042] The accumulator 1 shown in Fig. 1 has a plurality of battery cells 2. The battery cells 2 are conventional cylindrical cells of the 18650 or 21700 type.

[0043] According to Figures 2a and 2b, each battery cell 2 has a positive terminal 5 with a positive contact surface 4 on an end face 3. The positive contact surface 4 is arranged on an end plate (not shown) of the end face 3. It extends above the end plate along a longitudinal dimension L.

[0044] The battery cells 2 each have a negative terminal 6 with a negative contact surface 7. The negative terminal 6 is designed as a cup of the battery cell 2 and comprises a lateral sheath, an opposite end face 10, which is usually referred to as the negative terminal, and an end-face gripping 8 of the end plate with the negative contact surface 6.

[0045] The gripping element 8 surrounds an edge of the end plate and the positive terminal 5 and is electrically insulated from the positive terminal 5, so that when looking at the end face 3 of the battery cell 2, an outer narrow, ring-shaped edge surrounds the end face 3 and forms the negative contact surface 7. The negative contact surface 7 has a radial width of approximately 2.7 mm in the 21700 battery cell 2 configuration, while the positive contact surface 4 has a diameter of 7–9 mm.

[0046] The battery cell 2 shown in Figures 2a and 2b also has a tapered section 9 that surrounds a portion of the end face 3. Figures 2a and 2b show a simplified representation of the portion of the end face 3 of the battery cell 2. The positive terminal 5 comprises the circular end plate, which runs perpendicular to the longitudinal dimension L, as well as the positive contact surface 4. The positive terminal 5 is arranged on the end plate as an electrically conductive layer and is clamped in a positionally fixed position relative to the battery cell 2 between the circumferential section 8 and the tapered section 9.

[0047] Fig. 1 further shows an upper shell 11 and a base plate 12, which, in their assembled state, touch at a lateral edge of the base plate 12 and at a free edge of the upper shell 11 and are firmly connected to each other. The upper shell

[0048] 11 and the base plate 12 are each manufactured using an aluminum die-casting process.

[0049] An inner surface of the base plate 12 has a cup profile 13. One cup is provided for each opposite end face 10 of a battery cell 2. The inner diameter of the cups corresponds to the outer diameter of the opposite end face 10 of the battery cell 2.

[0050] In the embodiment shown in Fig. 1, a thin rubber insert 14 is provided between the opposite end faces 10 of the battery cells 2 and the base plate 12. The rubber insert 14 extends continuously over all opposite end faces 10 and insulates the negative terminals 6 of the battery cells 2 from each other. The rubber insert 14 can also have a cup profile 13a that is adapted to the cup profile 13 of the base plate 12.

[0051] The rubber insert 14 is advantageously designed to be so thin that it conforms completely to the cup profile 13 of the base plate 12.

[0052] The rubber insert 14 also allows heat generated in the battery cells 2 during operation to be dissipated via the opposite end face 10 to the base plate and from there to the environment. The rubber insert 14 is designed to be so thin that it acts as a good thermal conductor, enabling heat generated in the battery cells 2 during operation to be dissipated via the base plate 12.

[0053] A cell positioner 16 is provided on the end face 3 of the battery cell 2, extending along the end faces 3 of all battery cells 2. The cell positioner 16 can be seen in a side view in Figures 2a and 2b.

[0054] It has circular, continuous openings 17, each with an inner diameter corresponding to the outer diameter of the end faces 3 of the battery cells 2, so that sections of the battery cells 2 can be inserted through one of the openings 17 at the end faces 3. Circumferential edges of the openings rest against the casing of the battery cells 2 and thus hold the battery cells 2 in a stable position. The cell positioner 16 is a one-piece plastic component.

[0055] The cell positioner 16 allows the battery cells 2 to be positioned in a defined position relative to each other and also relative to the upper shell 11. The cell positioner 16 also has a circumferential lateral rim whose outer cross-section is precisely adapted to an inner cross-section of the upper shell 11 and which fits snugly against an inner wall of the upper shell 11, thus preventing the cell positioner 16 from slipping.

[0056] The contact board 18 is located on the end face opposite the cell positioner 16. The contact board 18 rests on the cell positioner 16. The contact board 18 has contact tongues 21 and 22, which are assigned in pairs to each of the battery cells 2. One contact tongue 21 is in electrical contact with the positive end face 4 of the battery cell 2. Another contact tongue 22 is in electrical contact with the negative end face 7. The contact tongue 21 and the contact tongue 22 together form the pair that is assigned to each of the battery cells 2.

[0057] The contact board 18 has a glass fiber plate as a carrier, on which conductive traces and areas are printed, particularly on the side facing a battery cell 2. One contact tongue and the other contact tongues 21, 22 are cut out of the glass fiber plate with the printed conductive traces. A cutting line 15 for each pair of contact tongues 21, 22 is E-shaped as shown in Fig. 3. The glass fiber plate acts, among other things, as a mechanical spring. On the side facing the battery cell 2, a protrusion 23 is applied to the conductive traces of one contact tongue 21 and another protrusion 24 is applied to those of the other contact tongue 22.

[0058] Figure 2a shows a pair of contact tongues 21, 22. Each pair of contact tongues 21, 22 is assigned to a battery cell 2. One contact tongue 21 rests under spring tension on the positive contact surface 4, the other contact tongue 22 rests under spring tension on the negative contact surface 7.

[0059] The contact tongues 21, 22, arranged in pairs, are spaced close together, with the section line 15 in the contact plate 18, through which the contact tongues 21, 22 are formed, each forming an “E” as shown in Fig. 3. To exert a spring force on the positive contact surface 4 and the negative contact surface 7 as shown in Fig. 2a, the contact tongues 21, 22 have conductive projections 23, 24 on their side facing the end face 3 of the battery cell 2. These projections are dimensioned such that, upon contact of the contact plate 18 with the cell positioner 16, the contact tongues 21, 22 are bent away from the battery cell 2 along their longitudinal dimension L, thus exerting a spring force on the respective contact surface 4, 7. Therefore, no metallurgical bond is required to form the electrical contact.

[0060] In this embodiment, a solder contact is used as a protrusion 23, 24. Here, solder paste is applied to a copper area on the contact tongue 21, 22; however, the solder paste is applied to a larger area than the area of ​​a corresponding copper pad. During the so-called reflow process, the solder paste contracts upon heating due to the surface tension of the solder, forming a spherical segment with the diameter of the copper pad, thus creating one protrusion 23 and the other protrusion 24.

[0061] In Fig. 3, seven conductive sections 26 and six insulating strips 27, which completely insulate the conductive sections 26 from each other, are shown on the side of the contact board 18 facing the battery cells 2. The contact tongues 21, 22 are arranged in two rows separated from each other by a free strip 29. The contact tongues 21, 22 of a pair lie exactly along one of the rows. The connecting lines of the contact tongues 21, 22 with the rest of the contact board 18 run along a straight edge of the free strip 29.

[0062] A negative terminal 6 and a positive terminal 5 along one of the conductive sections 26 of opposite battery cells 2 are electrically connected to each other via the conductive section 26, while the negative and positive terminals 6, 5 of each battery cell 2 are separated from each other by the insulating strip 27. The six battery cells 2 in Fig. 3 are arranged in a series connection. The connection is not shown.

[0063] A parallel circuit can be achieved by replicating the depicted construction to the right and / or left. In parallel-connected battery cells, the corresponding poles 5 and 6 are connected together, allowing balancing currents to flow.

[0064] The diameters of the spherical projections 23, 24 are the same at the positive and negative terminals 5, 6, as shown in Fig. 2a. A key aspect of the invention is that the contact tongues are positioned relative to each other, and particularly in relation to the associated battery cell 2, such that one contact tongue 21, with its projection 23, presses against the positive contact surface 4 of the battery cell 2 during operation, while the other contact tongue 22, with its other projection 24, presses against the negative contact surface 7, which is formed as a narrow edge strip of the battery cell 2, as shown in Fig. 2a. Therefore, the positioning of the contact plate 18 relative to the battery cells 2 must be positionally stable and permanently stable. The edge strip has a radial width of less than 3 mm, so the diameter and height, in particular of the other projection 24, and its relative position to the negative contact surface 7 must be very precise.

[0065] To generate a greater contact force of the projections 23, 24 of the contact tongues 21, 22 on the positive and negative contact surfaces 4, 7 of the battery cell 2, respectively, an inner surface of a cover wall of the upper shell 11 (see Fig. 4) has ribs 28. The ribs 28 are projections that are drawn deep from the cover wall and are arranged on the cover wall such that, in the assembled state, a rib 28 presses against one of the free strips 29, thus generating a higher and defined contact force across the entire contact plate 18, which the contact tongues 21, 22 exert on the contact surfaces 4, 7.

[0066] Reference symbol list

[0067] 1 accumulator

[0068] 2 battery cells

[0069] 3 Front

[0070] 4 positive contact surfaces

[0071] 5 positive terminal

[0072] 6 Negative terminal

[0073] 7 negative contact area

[0074] 8. Envelope

[0075] 9 Rejuvenation

[0076] 10 opposite end face

[0077] 11 Upper shell

[0078] 12 Base plate

[0079] 13 Cup profile

[0080] 13a Cup profile

[0081] 14 rubber inserts

[0082] 15 Section line

[0083] 16 cell positioners

[0084] 17 openings

[0085] 18 Contact board

[0086] 21 Contact tongue

[0087] 22 Contact tongue

[0088] 23 Survey

[0089] 24 Survey

[0090] 26 leading sections

[0091] 27 insulating strips

[0092] 28 ribs

[0093] 29 free lanes

[0094] L Longitudinal extent

Claims

Patent claims 1. Accumulator with at least one cylindrical battery cell (2) having an end face (3) having a central first contact surface (4) forming a region of a first electrical pole (5) and a second contact surface (7) circumferentially surrounding the end face (3) forming a region of a second electrical pole (6) and with a contact plate (18) with which the at least one battery cell (2) is contacted at the end face (3) and which has spring-elastic contact tongues (21, 22) and at least one spring-elastic contact tongue (21, 22) is assigned to the first and second contact surfaces (4, 7) of the at least one battery cell (2) and the contact tongues (21, 22) contact the first and second contact surfaces (4, 7) under spring tension.

2. Accumulator according to claim 1, characterized in that the at least one cylindrical battery cell (2) has a plurality of battery cells, and at least one spring-elastic contact tongue (21, 22) is assigned to at least one of the battery cells (2) for the first and second contact surfaces (4, 7) and the contact tongues (21, 22) contact the first and second contact surfaces (4, 7) under spring tension.

3. Accumulator according to claim 1 or 2, characterized in that the contact tongues (21 , 22) form a force-fit connection with the first and second contact surfaces (4, 7).

4. Accumulator according to claim 1, 2 or 3, characterized in that the first electrical pole (5) is a positive pole and the second electrical pole (6) is a negative pole.

5. Accumulator according to one of the preceding claims, characterized in that the at least one battery cell (2) has an end face (3) and an opposite end face (10) along a longitudinal extension (L).

6. Accumulator according to one of the preceding claims, characterized in that the first contact surfaces (4) and second contact surfaces (7) form outermost surfaces along the end face (3) in longitudinal extent (L).

7. Accumulator according to one of the preceding claims, characterized in that the circumferential second contact surfaces (7) are designed as circumferential edges of a battery cell casing.

8. Accumulator according to one of the preceding claims, characterized in that one or more contact tongues are formed as U-shaped, E-shaped, Q-shaped, H-shaped, double-l-shaped or M-shaped cut lines (15) from the contact board (18).

9. Accumulator according to one of the preceding claims, characterized in that conductive projections (23, 24) are arranged on the sides of the contact tongues facing the at least one battery cell (2), which establish contact with the second contact surface (7) and the first contact surface (4) under spring force.

10. Accumulator according to one of the preceding claims, characterized in that higher contact surfaces in longitudinal extent (L) protrude further from the end face (3) than lower contact surfaces and contact tongues (21 , 22) with longer spring arms are assigned to the higher contact surfaces than to the lower contact surfaces.

11. Accumulator according to one of the preceding claims, characterized in that higher contact surfaces in longitudinal extent (L) protrude further from the end face (3) than lower contact surfaces and contact tongues (21 , 22) with higher elevations (23, 24) are assigned to the lower contact surfaces than to the higher contact surfaces.

12. Accumulator according to one of the preceding claims, characterized in that a cell positioner (16) is provided in a section of the end faces (3) of the battery cells (2), which brings the battery cells (2) to defined positions relative to each other and to the contact board (18). 16 13. Accumulator according to one of the preceding claims, characterized in that openings (17) are provided in the cell positioner (16) through which a pair of contact tongues (21 , 22) is guided onto the contact surfaces (4, 7) of one of the battery cell (2).

14. Accumulator according to one of the preceding claims, characterized in that the cell positioner (16) has individual separate cell positioner elements which are arranged on the side of the contact board (18) facing the battery cells (2).

15. Accumulator according to one of the preceding claims, characterized in that the contact tongues (21 , 22) are electrically isolated from each other in the contact board (18).

16. Accumulator according to one of the preceding claims, characterized in that a top plate (11) is provided for pressure distribution with ribs (28) arranged on the battery side and the contact tongues (21 , 22) are arranged in a row in the contact plate (18) and a free strip (29) is formed between rows of contact tongues, on which the ribs (28) press.

17. Accumulator according to one of the preceding claims, characterized in that the at least one battery cell (2) is arranged with its opposite end face (10) on a base plate (12) and a thermal coupling exists between the opposite end faces and / or lateral surfaces (10) and the base plate (12).

18. Accumulator according to one of the preceding claims, characterized in that an electrically insulating layer (14) is provided between the base plate (12) and the opposite end faces (10), which is thermally conductive.

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