Battery cell

Abstract

The invention relates to a battery cell (10), comprising: a circuit board element (12); a light-emitting element (14) which is designed to indicate a state of charge of the battery unit (10); a light guide element (16); the light-emitting element (14) is arranged on the circuit board element (12), the light-guiding element (16) is in contact with the light-emitting element (14) in order to transmit a light beam from the light-emitting element (14), the key element (18) is arranged on the circuit board element (12), and the light-guiding element (16) is designed to transmit the light beam from the light-emitting element (14) to the key element (18). Forces acting on the light guide element (16) are transmitted to the key element (18) by means of a shape change of the light guide element (16).

Description

Field of the Invention

[0001] The present invention relates to a battery cell, a method for manufacturing a battery cell, and the use of a battery cell. Background Art

[0002] There are currently a variety of different solutions for constructing the housing assembly of a battery cell. Due to the increasing number of application scenarios of the battery and also due to the increasing comfort requirements, the demand for innovative and robust battery cells continues to increase.

[0003] The continuous weight reduction in the field of tools for increasing comfort and the increasing competition have led to cost pressure, thus more strongly demanding cheaper and more efficient components for tools. Summary of the Invention

[0004] The battery cell according to the invention having the features of claim 1 has the advantage over known battery cells that the light guide element and the covering of the button can be constructed in one piece, thereby increasing the resistance of the battery cell and reducing the manufacturing cost. Here, a cost advantage can be obtained in particular by the fact that the light guide element of the battery cell can be manufactured by means of a single-component or two-component injection molding process. This can particularly lead to a simplified assembly of the light guide element and also of the battery cell. Thus, the robustness of the battery pack can be particularly increased, and thus the quality can be improved or the customer comfort can be increased. A more durable product can be achieved by the integration of the light conduction function and the operating function, by resource conservation in the injection molding die structure, and by material savings and energy savings in the injection molding process. Further preferably, an improved sealing can be achieved by combining the light guide element with the housing of the battery cell, so that cheaper electronic components can be used, for example, components with high requirements for fluid tightness, etc. can be dispensed with.

[0005] This is achieved according to the invention in that the battery cell has a circuit board element. In addition, the battery cell has a light-emitting element which is designed to indicate the charge state of the battery cell. In addition, the battery cell has a light guide element and a button element. The light-emitting element is arranged on the circuit board element. The light guide element is in contact with the light-emitting element in order to transmit a light beam starting from the light-emitting element, wherein the button element is arranged at the circuit board element. In addition, the light guide element is designed to transmit the force acting on the light guide element to the button element by means of a shape change of the light guide element.

[0006] In other words, the light-guiding element assumes two functions, on the one hand, transporting the light beam from the light-emitting element to the outer surface of the battery cell, and on the other hand, forming a flexible cover for the key. Here, the battery cell can have a circuit board element in particular, on which the light-emitting element is arranged. It is further preferred that all other components of the battery cell, such as, for example, a battery management system or a charging module, can also be arranged on the circuit board element. It is further preferred that the light-emitting element can have a plurality of light-emitting diodes, or a plurality of light-emitting elements are arranged on the circuit board element, so as to indicate the charging state of the battery cell when the key element is operated. Here, the light-guiding element can in particular transport the light beam provided by the light-emitting element from the inner space of the battery cell to the outer surface of the battery cell. This can be achieved, for example, by means of plastic, such as, for example, polycarbonate. However, the light-guiding element can in particular have at least one other material and / or have a geometry that at least partially deflects the light-guiding element, so that the force acting on the light-guiding element can be transmitted to the key element. It is further preferred that ribs or protrusions, etc., can transport light from the light-emitting element, such as, for example, an LED, to a desired position on the outer side of the housing of the battery cell. In particular, the interior of the housing of the battery cell can thus be protected from environmental influences such as dust, moisture and the like.

[0007] The dependent claims reveal preferred developments of the invention.

[0008] The light-conducting element is preferably designed to actuate the key element at a predetermined force.

[0009] The advantage of this embodiment is that the light-conducting element can be designed by material selection or geometry in such a way that the key element is triggered only at a certain force, in order to thereby largely avoid unintentional activation of the key element.

[0010] Preferably, the battery cell comprises a housing element, wherein the light-conducting element is designed to form a substantially fluid-tight and / or particle-tight connection with the housing element.

[0011] The advantage of this embodiment is that the electronic components in the interior of the battery cell are protected from environmental influences, such as moisture and / or dust. "Substantially fluid-tight and / or particle-tight" in this context can particularly mean that the volume flow of the fluid and also the particles can be reduced, in particular, by at least 50%.

[0012] Preferably, the housing element, the button element and / or the light-conducting element have a stop element, wherein the stop element is designed to limit a pre-change of the light-conducting element.

[0013] The advantage of this embodiment is that, in the case of an increased force on the light guide element, the light guide element does not break or the breakage is avoided, and thus the durability of the battery unit can be significantly improved.

[0014] Further preferably, the light guide element has at least one tab that is inserted into a recess of the housing element.

[0015] The advantage of this embodiment is that a form-fitting connection is constructed between the light guide element and the housing by means of the tab and the recess of the housing element, so as to particularly provide a substantially fluid-tight and / or particle-tight connection. Here, the light guide element can particularly have tabs, ribs, etc. with a circular or angular cross-section, so that they can be inserted into the recesses or the like at the housing.

[0016] Preferably, the tab abuts against the light-emitting element.

[0017] The advantage of this embodiment is that the tab is designed such that the light beam can be transported from the light-emitting element to the outer surface of the battery unit, so as to substantially prevent the scattering effect of the light beam from the light-emitting element to other light-emitting elements.

[0018] Further preferably, the light guide element has another tab, wherein the other tab has a smaller longitudinal extension than the tab, so that the light guide element can be pushed between the light-emitting element and the housing element.

[0019] The advantage of this embodiment is that the light guide element can be better adapted to the available structural space because the light guide element can be pushed laterally due to the different tab heights.

[0020] Preferably, the light guide element has a first segment and a second segment, wherein the first segment abuts against the key element and the housing element, and wherein the second segment is provided for providing deflection of the first segment.

[0021] The advantage of this embodiment is that overvoltage of the key element can be prevented and the force guidance to the circuit board element can be reduced by the reduced deflection and also by the functional division into the first segment and the second segment.

[0022] Preferably, the second segment has an arcuate longitudinal extension to provide an elastic action for the first segment.

[0023] The advantage of this embodiment is that the excess load energy can be buffered by the arcuate longitudinal extension of the second segment or by the arcuate geometry, and thus the operating duration of the battery unit can be further increased.

[0024] Further preferably, the light guide element has a first section and a second section, wherein the first section is at least partially arranged above the key element, wherein the second section is at least partially arranged above the light emitting element, and wherein only the first section is configured to provide a shape change of the light guide element.

[0025] The advantage of this embodiment is that the second section is arranged at the light emitting element with a substantially fixed position, and thus the sealing performance at the light emitting element is further improved. At the same time, the necessary flexibility is provided in the first section to be able to activate the key element.

[0026] Preferably, the first section has a first material with a first elastic modulus, wherein the second section has a second material with a second elastic modulus, and wherein the first section and the second section are integrally constructed.

[0027] The advantage of this embodiment is that the performance of the first section or the second section can be specifically set by using different materials. For example, the first section has a material that can be at least partially deformed, so that a covering portion can be constructed for the key element. Further preferably, the second section has a substantially rigid material to be able to construct an improved sealing effect between the light guide element and the housing of the battery unit.

[0028] Preferably, the first section can be deflected relative to the second section, so that the second section is arranged with a substantially fixed position with respect to the light emitting element, and the first section provides a shape change of the light guide element.

[0029] The advantage of this embodiment is that the sealing performance between the light guide element and the housing of the battery unit can be further improved.

[0030] Further preferably, the light guide element has a deflection element, which is arranged between the first section and the second section, and wherein the deflection element is configured to deflect the first section relative to the second section to provide a shape change of the light guide element.

[0031] The advantage of this embodiment is that the degree of deflection or the deflection characteristics of the first section can be specifically set by adapting the material selection or the geometry of the deflection element.

[0032] Preferably, the first section and the second section are arranged relative to each other such that the first section is configured to exert a pre-tightening force against at least one side surface of the battery unit.

[0033] The advantage of this embodiment is that the amount of liquid and dust that may enter the housing during operation or when the key element is stationary can be reduced by means of the pre-tightening force.

[0034] Preferably, the circuit board element has a light emitting element, a key element and all electronic components of the battery management system, in particular the battery unit.

[0035] The advantage of this embodiment is that the manufacturing cost of the battery unit can be further reduced by means of functional integration.

[0036] Further preferably, the circuit board element has a main extension direction, and a plurality of light-emitting elements are arranged along the main extension direction to indicate the charging state of the battery unit.

[0037] The advantage of this embodiment is that the more light-emitting elements are arranged along the main extension direction, the more significantly the recognizability of the charging state can be improved.

[0038] Further preferably, the light guide element is provided for constructing at least one ring around the light-emitting element to guide light.

[0039] The advantage of this embodiment is that when the light guide element forms a ring or the like around the light-emitting element, the reflection of the emitted light is also guided to the outside of the housing.

[0040] Another aspect of the present invention relates to a method for manufacturing a battery unit as described above and below, the method having the steps of:

[0041] - providing a light guide element,

[0042] - arranging the light guide element at the battery unit,

[0043] wherein the arrangement constructs a substantially fluid-tight and / or particle-tight connection between the light guide element and the battery unit, and the light guide element provides a covering for the key element of the battery unit.

[0044] The advantage of this embodiment is that due to the arrangement of the light guide element, not only a fluid-tight but also a particle-tight connection can be provided, and a covering can be provided for the key element, so that the assembly duration of the battery unit can be significantly improved.

[0045] Another aspect of the present invention relates to the use of the battery unit as described above and below for energy supply. Description of the Drawings

[0046] The embodiments of the present invention will be described in detail below with reference to the drawings. In the drawings:

[0047] Figures 1 to 5 A battery unit according to an embodiment is shown,

[0048] Figure 6 A flowchart showing the steps of a method for explaining an embodiment is shown,

[0049] Figures 7 to 27 A battery unit according to an embodiment is shown. Detailed implementation manners

[0050] Preferably, all identical components, elements, and / or units are provided with the same reference numerals in all the drawings.

[0051] Figure 1 A battery unit 10 according to an embodiment is shown. Here, the battery unit 10 has a circuit board element 12. In addition, a light-emitting element 14 is arranged at the circuit board element 12 so as to be able to indicate the charging state of the battery unit 10. The light-emitting element 14 is arranged along the main extension direction 36 of the battery unit 10. Further preferably, the battery unit 10 has a light guide element 16, which, as shown in Figure 1 blocks the light-emitting element 14. Further preferably, the battery unit 10 has a key element 18, which indicates the charging state of the battery unit 10 when manipulated. Here, the light guide element 16 particularly has a first section 28 and a second section 30. The first section is arranged above the key element 18, and the second section is arranged above the light-emitting element 14. Further preferably, the battery unit 10 has a housing element 20, wherein the light guide element 16 and the housing element 20 provide a substantially fluid-tight and / or particle-tight connection, so as to be able to protect the light-emitting element 14 and also the circuit board element 12 from the environment.

[0052] Figure 2 A battery unit 10 according to an embodiment is shown. In Figure 2 the light guide element 16 of the battery unit 10 is shown. The light guide element 16 here has a first section 28 and a second section 30. Here, the first section 28 can particularly be arranged above the key element 18 of the battery unit 10, and the second section 30 can be arranged above the light-emitting element 14 of the battery unit 10.

[0053] Figure 3 An embodiment of a battery unit according to an embodiment is shown. The battery unit 10 here has a light-emitting element 14. The light guide element 16 abuts against the light-emitting element 14. In addition, the battery unit 10 has a housing element 20. The housing element 20 here forms a recess 26, and the tab 24 of the light guide element 16 is embedded in this recess. Thus, a light beam can start from the light-emitting element 14, and the light beam can be guided to the outside of the battery unit 10 by means of the tab 24. Further preferably, the battery unit 10 has a side surface 34. The light guide element 16 here particularly blocks the key element 18 in the first section 28. Here, when a force 40 acts on the light guide element 16, the key element 18 can deflect relative to the side surface 34. As shown in Figure 3As shown, the light guide element 16 is deflected in order to manipulate the key element 18. Further preferably, the light guide element 16 has a second section 30 which shields the light-emitting element 14. Here, the first section 28 can be arranged relative to the second section 30 such that the first section constructs a pretensioning force 38 in the direction of the side 34.

[0054] Figure 4a A battery cell 10 according to an embodiment is shown. Here, the light guide element 16 has a first section 28. The first section 28 is arranged at the second section 30 by means of a deflection element 32. Here, the deflection element 32 is configured such that a force 40 acts on the first section 28, so that the first section 28 of the light guide element 16 is deflected or in a deflected state 42 in order to manipulate the key element 18. Here, the deflected state 42 of the light guide element 16 can be defined in particular by a stop element 22. Further preferably, the stop element 22 is positioned such that when the force 40 acts on the first section 28, the key element 18 is manipulated, however the deflection 42 is limited to a predetermined extent.

[0055] Figure 4b A battery cell 10 according to an embodiment is shown. The battery cell 10 here has a light guide element 16. The light guide element 16 here has a tab 24 which is configured to transport a light beam from the light-emitting element 14 to the side 34 of the battery cell 10. Further preferably, the light guide element 16 has a first section 28 which is arranged above the key element 18. Further preferably, the light guide element 16 has a second section 30 which is arranged above the light-emitting element 14. Further preferably, the first section 28 and the second section 30 are connected to one another by means of a deflection element 32.

[0056] Figure 5 A battery cell 10 according to an embodiment is shown. The battery cell 10 here has a circuit board element 12. In addition, the battery cell 10 has a light-emitting element 14 which is configured to indicate the charge state of the battery cell 10. In addition, the battery cell 10 has a light guide element 16 and a key element 18. Here, the light-emitting element 14 is arranged on the circuit board element, wherein the light guide element 16 is in contact with the light-emitting element 14 in order to transmit a light beam starting from the light-emitting element 14. In addition, the key element 18 is arranged at the circuit board element 12. In addition, the light guide element 16 is configured to transmit a force 40 acting on the light guide element 16 to the key element 18 by means of a shape change of the light guide element 16.

[0057] Figure 6 A flow chart for explaining the steps of a method 100 according to an embodiment is shown. The method 100 for manufacturing the battery cell 10 as described above and below has the steps:

[0058] - Provide a light guide element 16,

[0059] - Arrange the light guide element 16 S2 at the battery unit 10,

[0060] wherein the arrangement of the light guide element 16 constructs a substantially fluid-tight and / or particle-tight connection between the light guide element 16 and the battery unit 10, and the light guide element 16 provides a covering for the key element 18 of the battery unit 10.

[0061] Figure 7 An embodiment of the battery unit 10 is shown. The battery unit 10 includes a housing element 20 herein. As Figure 7 shown, a covering 21 is arranged above the light guide element 16.

[0062] Figure 8 An embodiment of the battery unit 10 is shown. The battery unit 10 includes a housing element 20 herein. Preferably, the light guide element 16 is arranged at the housing element 20 in a force-locking and / or form-locking manner, so that no fluid or the like can enter the battery unit 10 from the outside.

[0063] Figure 9 An embodiment of the battery unit 10 is shown. The battery unit 10 includes a circuit board element 12, a plurality of light-emitting elements 14 and a key element 18. In addition, the battery unit 10 has a housing element 20. The housing element 20 is designed to be at least partially transparent as Figure 9 shown.

[0064] Figure 10 An embodiment of the battery unit 10 is shown. The battery unit 10 preferably includes a circuit board element 12, above which a light guide element 16 is arranged. In addition, the circuit board element 12 and the light guide element 16 are arranged at the housing element 20 of the battery unit 10.

[0065] Figure 11 An embodiment of the battery unit 10 is shown. The battery unit 10 has a light guide element 16 herein.

[0066] Figure 12 An embodiment of the battery unit 10 is shown. The battery unit 10 includes a light guide element 16 herein.

[0067] Figure 13Shows a battery cell 10 according to one embodiment. The battery cell 10 preferably includes a plurality of light-emitting elements 14 and a key element 18. Above the light-emitting elements 14 and the key element 18, a light guide element 16 of the battery cell 10 is arranged. Here, the light guide element 16 can in particular at least partially protrude from a housing element 20 of the battery cell 10, so that the light guide element 16 can be pressed against the key element 18 at least partially.

[0068] Figure 14 Shows a battery cell 10 according to one embodiment. The battery cell 10 preferably has a housing element 20. The housing element 20 at least partially surrounds the light guide element 16, the key element 18 and a circuit board element 12. Here, the light guide element 16 can be at least partially covered by a covering part 21. Preferably, the covering part 21 is fixed to the housing element 20.

[0069] Figure 15 Shows a battery cell 10 according to one embodiment. The battery cell 10 here has a circuit board element 12 and a light-emitting element 14, above which a light guide element 16 is arranged. In addition, the housing element 20 at least partially surrounds the light guide element 16. Further preferably, the light guide element 16 is covered by a covering part 21.

[0070] Figure 16 Shows an embodiment of the battery cell 10. The battery cell 10 preferably has a circuit board element 12, a light-emitting element 14 and a key element 18. The light guide element 16 is preferably arranged above the light-emitting element 14 and the key element 18. The light guide element 14 preferably has a first tab 24, which is embedded in a recess 26 of the housing element 20. Further preferably, the light guide element 16 has another tab 25, wherein the other tab 25 has a smaller longitudinal extension than the tab 24, so that the light guide element 16 can be pushed between the light-emitting element 14 and the housing element 20. Further preferably, the light guide element 16 has a first segment 29 and a second segment 31, wherein the first segment 29 abuts against the key element 18 and the housing element 20, and wherein the second segment 31 is provided for providing a deflection of the first segment 29. Further preferably, the second segment 31 has an arcuate longitudinal extension in order to be able to exert an elastic action on the first segment 29.

[0071] Figure 17 Shows an embodiment of the battery cell 10. Figure 17 Shows a perspective view of the battery cell 10 as already described in Figure 16 above.

[0072] Figure 18An embodiment of the battery unit 10 is shown. The battery unit 10 preferably includes a circuit board element 12 on which a key element 18 is arranged. Preferably, a first segment 29 of the light guide element 16 abuts against the key element 18.

[0073] Further preferably, a second segment 31 of the light guide element 16 enables the first segment 29 to deflect relative to the key element 18. Further preferably, the light guide element 16 has a tab 24 and a further tab 25.

[0074] Figure 19 An embodiment of the battery unit 10 is shown. Figure 19 A side view shows the battery unit 10 with a similar configuration as already described in Figure 18 as such.

[0075] Figure 20 An embodiment of the battery unit 10 is shown. The battery unit 10 has a circuit board element 12 at which a light-emitting element 14 and a key element 18 are arranged. Above the light-emitting element 14 and the key element 18, a light guide element 16 is arranged. An auxiliary light conductor 33 can be arranged between the light guide element 16 and the circuit board element 12. The auxiliary light conductor 33 can transport a light beam from the light-emitting element 14 to the light guide element 16 in particular.

[0076] Figure 21 An embodiment of the battery unit 10 is shown. The battery unit 10 has a circuit board element 12 on which a plurality of light-emitting elements 14 are arranged. Above the light-emitting elements 14, a light guide element 16 is arranged. Here, the circuit board element 12 and the light guide element 16 are preferably arranged at a housing element 20. The light guide element 16 can form a kind of ring 37 around the light-emitting elements 14. Thus, the light guide element 16 can guide light on the one hand and can also direct reflections to the outside of the housing element 20.

[0077] Figure 22 A battery unit 10 according to an embodiment is shown. The battery unit 10 preferably includes a light guide element 16 which has a plurality of rings 37 around the respective light-emitting elements 14.

[0078] Figure 23 An embodiment of the battery unit 10 is shown. The battery unit 10 here has a circuit board element 12 on which a key element 18 and a plurality of light-emitting elements 14 are arranged. Above the key element 18 and the light-emitting elements 14, a light guide element 16 is arranged. The light guide element 16 preferably forms a plurality of rings 37 especially around each of the light-emitting elements 14.

[0079] Figure 24An embodiment of the battery unit 10 is shown. The battery unit 10 preferably has an optical waveguide element 16 with a plurality of rings 37.

[0080] Figure 25 An embodiment of the battery unit 10 is shown. The battery unit 10 hereby has an optical waveguide element 16 with a plurality of rings 37.

[0081] Figure 26 An embodiment of the battery unit 10 according to is shown. The battery unit 10 preferably has a circuit board element 12, on which a light-emitting device 14 and a key element 18 are arranged. An optical waveguide element 16 is arranged above the light-emitting element 14 and the key element 18, and the optical waveguide element constructs a ring 37 around the light-emitting element 14. Preferably, a plug-in light conductor 39 can be arranged in the ring 37. Therefore, not only the reflected light passing through the ring 37 but also the direct light can be transported from the light-emitting element 14 to the outside of the housing element 20 through the plug-in light conductor 39.

[0082] Figure 27 An embodiment of the battery unit 10 is shown. The battery unit 10 preferably includes a circuit board element 12, on which an optical waveguide element 16 is arranged. Preferably, the circuit board element 12 and the optical waveguide element 16 are arranged at the housing element 20. The optical waveguide element 16 preferably has a plurality of rings 37, and a plug-in light conductor 39 can be arranged in the rings.

Claims

1. A battery unit (10) having - a circuit board component (12), a light-emitting element (14) which is designed to indicate the charge state of the battery cell (10), - a light-guiding element (16), - a key element (18), in, The light emitting element (14) is arranged on the circuit board element (12), wherein the light guide element (16) is in contact with the light emitting element (14) so ​​as to transmit a light beam from the light emitting element (14). The key element (18) is arranged on the circuit board element (12). The light-conducting element (16) is designed to transmit a force acting on the light-conducting element (16) to the key element (18) by means of a change in shape of the light-conducting element (16).

2. The battery unit (10) according to claim 1, wherein: The light-conducting element (16) is designed to actuate the key element (18) at a predetermined force.

3. The battery cell (10) according to any one of the preceding claims, wherein: The battery cell (10) has a housing element (20), wherein the light-conducting element (16) is designed to form a substantially fluid-tight and / or particle-tight connection with the housing element (20).

4. The battery unit (10) according to claim 3, wherein: The housing element (20), the button element (18) and / or the light-conducting element (16) have a stop element (22), wherein the stop element (22) is designed to limit a change in shape of the light-conducting element (16).

5. The battery unit (10) according to any one of claims 3 to 4, wherein: The light-conducting element (16) has at least one web (24) which engages in a recess (26) of the housing element (20) in order to provide the substantially fluid-tight and / or particle-tight connection.

6. The battery unit according to any one of claims 5, wherein: The light-conducting element (16) has a further web (25), wherein the further web (25) has a smaller longitudinal extension than the web (24), so that the light-conducting element (16) can be inserted between the light-emitting element (14) and the housing element (20).

7. The battery cell (10) according to any one of the preceding claims, wherein: The optical waveguide element (16) has a first section (29) and a second section (31), wherein the first section (29) abuts against the key element (18) and the housing element (20), and wherein the second section (31) is designed to provide a deflection of the first section (29).

8. The battery unit (10) according to claim 7, wherein: The second segment (31) has an arc-shaped longitudinal extension direction so as to provide a spring force for the first segment (29).

9. The battery cell (10) according to any one of the preceding claims, wherein: The optical waveguide element (16) has a first section (28) and a second section (30), wherein the first section (28) is at least partially arranged above the key element (18), wherein the second section (30) is at least partially arranged above the light-emitting element (14), wherein only the first section (28) is designed to provide a shape change of the optical waveguide element (16).

10. The battery unit (10) according to claim 9, wherein: The first section (28) is pivotable relative to the second section (30), so that the second section (30) is arranged substantially stationary relative to the light-emitting element (14) and the first section (28) provides a change in shape of the light-conducting element (16).

11. The battery unit (10) according to any one of claims 9 to 10, wherein: The optical waveguide element (16) has a deflection element (32) which is arranged between the first section (28) and the second section (30), wherein the deflection element (32) is designed to deflect the first section (28) relative to the second section (30) in order to provide a change in shape of the optical waveguide element (16).

12. The battery unit (10) according to any one of claims 9 to 11, wherein: The first section (28) and the second section (30) are arranged relative to one another in such a way that the first section (28) is designed to form a preload against at least one side surface (34) of the battery cell (10).

13. The battery cell (10) according to any one of the preceding claims, wherein: The light-guiding element (16) is designed to form at least one ring (37) around the light-emitting element (14) in order to guide light.

14. A method (100) for producing a battery cell (10) according to any one of the preceding claims, the method comprising the steps of: - providing (S1) a light-guiding element (16), - arranging (S2) the optical waveguide element (16) on the battery cell (10), in, The arrangement forms a substantially fluid-tight and / or particle-tight connection between the light-conducting element (16) and the battery cell (10), and the light-conducting element (16) provides a cover for a key element (18) of the battery cell (10).

15. Use of a battery cell (10) according to any one of claims 1 to 13 for energy supply.

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