Cap structure assembly, energy storage cell, battery module and method for filling energy storage cell

Abstract

A cover structure assembly (140) for a unit housing (110) of an energy storage unit (100) is described. In the mounted state, the cover assembly (140) is provided for enabling filling of the cell housing (110) with an electrolyte (190). In this case, the cover assembly (140) has an end plate (120), which has a fastening assembly (200), which has an opening region (220). A first gas barrier (240) is provided for closing the opening region (220) in a gas-tight manner before filling the cell housing (110) and for being penetrated by a filling element for filling the cell housing (110), such that an opening (221) is formed in the first gas barrier (240), through which an electrolyte (190) can be filled into the cell housing (110). Furthermore, a second gas barrier (250) is provided for closing the opening (221) in a gas-tight manner after filling the unit housing (110).

Description

Technical Field

[0001] The present invention relates to a cover structure assembly, an energy storage unit, a battery module, and a method for filling the energy storage unit. Background Technology

[0002] Electrochemical storage units such as lithium-ion battery cells typically must be transported over long distances after their manufacture. For example, international transport guidelines must be considered when transporting lithium-ion battery cells, including the European Convention on the International Road Transport of Dangerous Goods (ADR), the International Maritime Dangerous Goods Regulation (IMDG), the International Air Transport Association (IATA) Dangerous Goods Transport Regulations (DGR), and the United Nations Manual on Testing and Criteria for the Transport of Dangerous Goods. These transport regulations contain provisions for the labeling, packaging, documentation, handling, and storage of lithium-ion battery cells during transport to ensure their safety. Sometimes batteries are difficult to transport, especially when they have not yet been approved (e.g., according to UN 38.3). On the other hand, additional mounting components, such as temperature sensors, can invalidate approvals and make air or cross-border transport difficult. In particular, lithium-ion battery cells filled with electrolyte (development samples) may contain construction defects and are therefore considered potentially hazardous. Consequently, such battery cells cannot always, or at least not usually, be transported cost-effectively, and special requirements are placed on packaging.

[0003] According to existing technology, electrochemical storage cells are typically filled with electrolyte directly after assembly and then sealed. Dry cell batteries must be protected from air and moisture intrusion by costly transport packaging until filling. Figure 6 shows a cap configuration device 140 known from the prior art. The cap configuration device 140 has a sealing plate 120 having a groove 210 extending around a longitudinal axis L. The end plate 120 also has a fixing configuration device 200 having an opening 220 arranged substantially centrally about the end plate 120. The fixing configuration device 200 is arranged symmetrically about the longitudinal axis L. The fixing configuration device 200 includes a first support ring 201 arranged on one side of the end plate 120 and a second support ring 203 arranged on the opposite side of the end plate 120. The opening 220 is closed with a membrane 230.

[0004] The membrane 260 can be punctured using a filling tool, and then the electrolyte 190 can be filled into the cell housing 110. After filling and removing the filling tool from the cell housing 110 and the membrane 260, the membrane 260 is essentially sealed. This sealing prevents a large amount of electrolyte 190 from escaping from the cell housing 110. Deposition is particularly possible for electrolyte 190, which has a boiling point below room temperature. However, the sealing of the membrane 260 is only sufficient for the filling process. A stable and durable seal is required during battery cell 100 operation. Therefore, a cap is additionally provided, which is hermetically secured to the mounting device 200.

[0005] A new battery cell design must be developed that protects the cell from air and moisture after assembly and allows for later electrolyte filling to simplify and improve storage and transportation processes. This could also significantly reduce the cost of packaging and shipping unfilled dry cell cells and improve the efficiency and sustainability of lithium-ion battery cells and similar electrochemical storage units.

[0006] The purpose of this specification is to provide a cover structure assembly, an energy storage unit, a battery module, and a method for filling the energy storage unit, which simplifies and improves the storage and transportation process of electrochemical energy storage units.

[0007] These objectives are achieved by a cover structure assembly, an energy storage unit, a battery module, and a method for filling the energy storage unit, having the features of both independent and parallel patent claims. Advantageous embodiments and further improvements of the invention are derived from the dependent claims. Summary of the Invention

[0008] The following is a basic understanding: Each feature described with respect to any implementation can be used alone or in combination with other features described herein, and can be used in combination with one or more features of any other implementation or in any combination of any other implementation, unless this is explicitly described as an alternative. Furthermore, equivalent and modified embodiments not described below may be used without departing from the scope of the claimed technical solution.

[0009] The following describes a cover structure assembly for a cell housing of an energy storage unit. According to one embodiment, the cover structure assembly, in its installed state, is configured to enable the filling of the cell housing with an electrolyte. The cover structure assembly includes an end plate having a fixing structure assembly, which further has an opening region. Furthermore, the cover structure assembly includes first and second gas barrier elements.

[0010] The first gas barrier is configured to hermetically seal the opening area before filling the cell housing and to allow the element being filled to penetrate the cell housing, thereby forming an opening in the first gas barrier. Electrolyte can be filled into the cell housing through this opening. The second gas barrier is configured to hermetically seal the opening after filling the cell housing.

[0011] The second gas barrier is configured, for example, to close the filling opening in the first gas barrier created by filling the cell housing. The cell housing can be filled through the first gas barrier, and for this purpose, for example, by piercing and / or penetrating a filling element comprising a hollow needle. This creates a filling opening in the first gas barrier that can be at least partially, but possibly not completely, closed due to material properties. An optional septum can at least partially close the filling opening, thereby preventing or at least delaying the leakage of electrolyte from the cell housing after the filling process. As a result, the cell housing can be finally sealed by the second gas barrier, for example, by (laser) welding, crimping, or other mechanical connections (e.g., threaded connections).

[0012] Electrochemical storage units, as used below, refer to electrochemically based energy storage devices, particularly rechargeable energy storage devices, suitable for storing electrical energy and discharging it to consumers, such as those in vehicles. The concept presented herein can be used for various storage units, such as lithium-ion batteries. In the following text, the term "lithium-ion battery" is used synonymously with all names commonly used in the art for lithium-containing current-carrying elements and battery cells, such as lithium battery, lithium battery cell, lithium-ion battery, lithium polymer battery cell, lithium-ion battery unit, and lithium-ion accumulator.

[0013] In addition, sodium-ion batteries can be used. The term "sodium-ion battery" is used synonymously with all names commonly used in the prior art for sodium-containing current elements and battery cells, such as sodium battery, sodium battery cell, sodium-ion battery cell, sodium polymer battery cell, sodium-ion battery unit, and sodium-ion rechargeable battery. The aspects set forth within the scope of this specification are not limited to specific types of current elements and battery cells, but can also be used with lithium, magnesium, and sodium-ion batteries, etc. For example, this type with SO2 as the electrolyte can be used. In particular, rechargeable batteries, so-called secondary batteries, are included. The terms "battery" and "electrochemical battery cell" are also used synonymously with the terms "lithium-ion battery" and "lithium-ion battery cell" or "sodium-ion battery" and "sodium-ion battery cell".

[0014] The term "electrolyte" refers to a liquid or solid material through which ions can be guided, thereby enabling current transfer between the electrodes of a battery, particularly between the cathode and anode. Unlike the electronic conductivity (through electrons) of electrode materials, an electrolyte must be capable of conducting ions, that is, conducting current by transporting charged atoms or molecules (ions). An electrolyte is advantageously chemically stable over a wide temperature window and electrochemically stable over the largest possible voltage window, resisting decomposition. Ideally, it is non-toxic and non-flammable, or at least has a high ignition point and low heat of combustion. For example, an electrolyte may be liquid under operating conditions, such as SO2.

[0015] Furthermore, the concept presented here is based on the following considerations. The aforementioned drawbacks of the prior art are, in part, due to the fact that electrochemical storage cells are typically filled with electrolyte directly after assembly and then sealed. Transporting such battery cells is usually costly and intensive. In principle, dry cell cells that are not yet filled with electrolyte might be easier to transport, but until now they have had to be protected from air and moisture intrusion through costly transport packaging until filling. There are also other aspects to this consideration: when dry cell cells are stored as spares, they do not age because they are not electrically activated. Relatedly, costs for air conditioning and charging are saved, and dry cells can withstand greater temperature fluctuations than activated battery cells.

[0016] One approach proposes dry transport of assembled battery cells and the provision of special cell seals to prevent moisture from entering the cells during transport or storage. The new cell seals specify that the battery cells are filled with electrolyte, shaped, and then sealed only in their designated locations, or during filling. Gas barriers are incorporated to effectively and permanently protect the cell casing from external influences (such as moisture). Therefore, the battery cells can be stored for virtually any length of time and can be easily transported and cost-effectively stored in an unfilled state because they do not need to be declared hazardous materials.

[0017] The proposed cap structure assembly enables the transport of electrochemical storage units, i.e., lithium-ion battery cells, without having to meet stringent hazardous materials requirements or provide costly packaging. Therefore, series units and experimental units can be transported equally easily by land, air, or water. Furthermore, it eliminates the costly temperature control during transport, which is necessary for active battery cells to prevent aging at uncontrolled high temperatures. This minimal expense reduces transportation costs. Know-how can also be protected, for example, if the electrolyte should not be disclosed to battery manufacturers. It is also advantageous to store battery cells after end-of-production (EoP) and activate them only when needed. Advantageously, dry cell cells do not need to be aged and do not require temperature control during storage.

[0018] According to one embodiment, a partition is arranged between the first gas barrier and the second gas barrier in the opening region. The partition is configured to be penetrated by the filling element to fill the unit housing. Furthermore, the partition is configured to close the opening region after filling the unit housing. For example, the partition is made of an elastic material. This allows for the absence or minimal leakage of electrolyte or solvent at the point where the filling element penetrates the partition.

[0019] According to one embodiment, the first gas barrier and the end plate are integrated. The end plate has a small thickness in the region of the first gas barrier. The small thickness is selected or configured to hermetically seal the opening region before filling the cell housing and to allow the filling element to penetrate the cell housing such that the (filling) opening is formed in the first gas barrier, through which the electrolyte can be filled into the cell housing.

[0020] According to one embodiment, the first gas barrier and the end plate are implemented separately. The first gas barrier is inserted into an opening region of the end plate. For example, the end plate has a region into which the first gas barrier can be inserted and fixed. The first gas barrier is configured to hermetically seal the opening region before filling the cell housing and to be penetrated by the filling element to fill the cell housing, such that the opening is formed in the first gas barrier, through which the electrolyte can be filled into the cell housing.

[0021] According to one embodiment, the first gas barrier has a foil. The foil is disposed on the side of the partition facing the unit housing. The foil is preferably understood herein as various thin, planar structures, for example made of plastic, rubber, metal, or other materials, or a combination of two or more different materials, having a large planar extension relative to its thickness. This achieves both a good seal of the opening and good permeability of the first gas barrier. According to one embodiment, the first gas barrier has, for example, metal and / or metal foil.

[0022] According to one embodiment, the end plate also has a surrounding groove. The surrounding groove is configured to allow the end plate to break in the region of the groove. This occurs, for example, when a defined overpressure has been reached or exceeded in the cell housing, allowing the electrolyte to escape at least partially through the broken region.

[0023] With the cover structure assembly installed, the end plate can rupture in the area of ​​the surrounding groove when a predetermined pressure is reached or exceeded in the cell housing. This prevents further increase in the pressure present in the cell housing. This preferably achieves controlled, directional, and therefore safe pressure unloading. Thus, the cover structure assembly not only enables reliable and safe electrolyte filling under normal conditions but also reduces overpressure that may occur in the battery cell, such as due to strong temperature rise caused by short circuits within the cell.

[0024] According to one embodiment, the end plate has a support ring in the region of the first gas barrier. The support ring is configured to receive and secure a second gas barrier. The support ring is used for mechanical connection with the second gas barrier.

[0025] Furthermore, an energy storage unit is proposed. According to one embodiment, the energy storage unit includes a unit housing and two electrodes disposed within the unit housing. Additionally, the energy storage unit includes a cover structure assembly according to one or more of the aspects discussed above. The cover structure assembly is fixed to the unit housing such that the unit housing is closed.

[0026] Furthermore, a battery module is proposed. The battery module includes multiple energy storage units according to one or more of the aspects discussed above.

[0027] Furthermore, a motor vehicle having an electric drive unit or a hybrid drive unit and a battery module according to the aspects discussed above is proposed.

[0028] Furthermore, a method for manufacturing an energy storage unit is proposed. According to one embodiment, a unit housing is first provided. A cover structure assembly with end plates is manufactured by structuring the workpiece into a fixed structural assembly with open areas. A first gas barrier is provided, and the first gas barrier is configured to hermetically seal the open areas before filling the unit housing. The first gas barrier is also configured to allow the filling element to penetrate the unit housing such that an opening is formed in the first gas barrier, through which the electrolyte can be filled into the unit housing.

[0029] According to one embodiment, a second gas barrier is provided, the second gas barrier being configured to hermetically seal the opening after filling the unit housing.

[0030] Furthermore, a method for transporting energy storage units is proposed. According to one embodiment, an energy storage unit according to one or more of the above aspects is first manufactured. The manufactured energy storage unit is then transported from the manufacturing site to a location where it will be further used. The transport can be carried out without electrolyte already being filled into the energy storage unit.

[0031] Furthermore, a method for filling an energy storage unit is proposed. The energy storage unit can be manufactured and / or transported according to the above method. According to one embodiment, a filling element penetrates a first gas barrier, wherein the filling element forms an opening in the first gas barrier. Furthermore, the unit housing is filled with an electrolyte, and for this purpose, the filling element is guided through the opening. Finally, the opening is hermetically sealed by means of a second gas barrier.

[0032] Embodiments of the present invention are described below with reference to the accompanying drawings. Further details, preferred embodiments, and further improvements are thus derived. Identical or functionally equivalent components are given the same reference numerals in the drawings. The dimensions of the components shown and their relative proportions should not be considered to be proportional. As long as the parts and components in different drawings are functionally identical, it is unnecessary to repeat their description for each of the following drawings. Attached Figure Description

[0033] In detail:

[0034] Figure 1 An embodiment of a battery cell is shown.

[0035] Figure 2A , 2B An embodiment of a cover structure assembly is shown.

[0036] Figures 3A-3D An embodiment of a method for manufacturing a cover structure assembly is shown.

[0037] Figures 4A-4C An embodiment of a method for filling an energy storage unit is shown.

[0038] Figure 5A , 5B Another embodiment of the cover structure assembly is shown, and

[0039] Figure 6 illustrates an embodiment of a cover structure assembly from the prior art. Detailed Implementation

[0040] exist Figure 1The figure schematically illustrates a battery cell 100 according to one embodiment. The battery cell 100 has a hollow cylindrical cell housing 110 (circular cell) having a longitudinal axis L. The cell housing 110 may also be configured as a cuboid. The cell housing 110 has a conductive material, for example, for contact conduction. However, it is also conceivable that the cell housing 110 has an electrically insulating material. The cell housing 110 is closed on one side by a base plate 130. On the side opposite to the base plate 130, the cell housing 110 is closed by a cover mounting device 140. The cover mounting device 140 has an end plate 120. The area shown in dashed lines in this figure is described in more detail in the following figures.

[0041] An end plate 120 is arranged in a surrounding groove of the unit housing 110, wherein an electrical insulating element 150 is arranged between the end plate 120 and the groove, the electrical insulating element electrically insulating the end plate 120 relative to the unit housing 110. Furthermore, the electrical insulating element 150 functions hermetically, allowing the unit housing 110 to be hermetically closed using a cover mounting device 140. Here, the opening of the groove points towards the longitudinal axis L.

[0042] However, it is conceivable that no electrically insulating element 150 is arranged between the end plate 120 and the groove. This might be meaningful if the unit housing 110 has an electrically insulating material. Furthermore, it is conceivable that a polarity electrode passes through the base plate 130 of the unit housing 110, wherein the through portion is electrically insulated relative to the unit housing 110 and is also integrated into the base plate 130. In this case, the cover can also be directly connected to the unit housing 110, especially by crimping or welding.

[0043] An electrode winding 160 (also called an electrode roll or, in English, a "jelly roll") is arranged in the unit housing 110. The electrode roll 160 includes an electrode 170 having a first positive polarity and an electrode 175 having a second negative polarity. However, the electrode roll 160 can also be configured such that the first polarity is negative and the second polarity is positive. The electrode roll 160 is arranged in the unit housing 110 such that the positive electrode 170 and the negative electrode 175 are arranged alternately in the radial direction. A separator 180 is arranged between the positive electrode 170 and the negative electrode 175, respectively, so that the electrodes 170 and 175 of different polarities are electrically insulated from each other, wherein the separator 180 is made of an electrically insulating material. In addition, an electrolyte 190 with a certain filling level is schematically shown in the unit housing 110. The electrolyte 190 is filled into the unit housing 110 through a cover configuration device 140 (indicated by the dashed area).

[0044] Figure 2A and Figure 2BAn embodiment of a cover structure assembly is shown. The cover structure assembly 140 has an end plate 120. The end plate 120 has a longitudinal axis L about the unit housing 110 (see [reference]). Figure 1 A groove 210 surrounds the end plate 120. The groove 210 has a triangular cross-section. Similarly, the cross-section can be semi-circular, rectangular, or other shapes. The end plate 120 has a thinner thickness in the region of the groove 210 than its thickness at the time of manufacture, and thus can be more easily broken in these regions. The end plate 120 has a fixing structure assembly 200 having an opening region 220 arranged substantially centrally with respect to the end plate 120. The fixing structure assembly 200 is about the longitudinal axis L (see...). Figure 1 Arranged symmetrically.

[0045] The fixed configuration device 200 includes an opening region 220. In the opening region 220, the end plate 120 has a first gas barrier 240. In this embodiment, the gas barrier 240 and the end plate 120 are integral and made of the same material. The first gas barrier 240 is implemented as a region of the end plate 120 having a thickness smaller than the thickness outside the opening region 220. The end plate 120 thins to a certain extent within the opening region 220. Here, this smaller thickness is chosen such that it can be penetrated or pierced by the filling element 300 to fill the unit housing 110.

[0046] End plate 120 also has a recess 202 in the opening region 220. The recess 202 in end plate 140 is configured to receive a partition 230. The partition 230 is configured to be penetrated by the filling element 300 to fill the unit housing 110 and to close the opening region 220 after filling the unit housing 110. For example, the partition 230 has an elastic material into which the filling element 300 can be injected. The partition 230 automatically closes after the filling element 300 is pulled out. The fixing configuration device 200 also includes a support ring 201 disposed on the upper side of end plate 120. The partition 230 is disposed in and fixed by the support ring 201. Unlike the first gas barrier 240, the partition 230 is not completely airtight.

[0047] Battery cell 100 can be configured for storage and transportation in a first state (see [reference]). Figure 2A In this state, the unit is assembled but not filled with electrolyte. Figure 2A The illustrated cover assembly 140 can be fitted onto and closed the unit housing 110. In the first state, the first gas barrier 240 is intact, i.e., not penetrated or punctured by the filling element, and the unit is closed in an airtight manner. Optionally, a partition 230 is arranged in the support ring 201 or the recess 202 and additionally closes the unit.

[0048] During the operation of the battery cell 100, a stable and persistent sealing is required. Therefore, in the second state (or operating state), the battery cell 100 may be additionally supplemented with a second gas barrier 250 (e.g., a cover), which may be made of metal (see [link to relevant documentation]). Figure 2B A separator 230 is arranged in the opening region 220 between a first gas barrier 240 and a second gas barrier 250. The separator 230 is not necessarily completely airtight, allowing gas and / or electrolyte 190 to escape during battery cell 100 operation. The second gas barrier 250 provides an airtight seal to the cell housing 110, preventing gas from escaping through the separator 230. The second gas barrier 250 is preferably secured to the support ring 201 by a material locking mechanism, and is performed, for example, by welding, such as laser or ultrasonic welding.

[0049] In an alternative embodiment, the first gas barrier 240 may be implemented separately from the end plate 120. For example, the first gas barrier 240 may be implemented in or connected to an opening in the end plate 120 within the opening region 220. Alternatively, the first gas barrier 240 may also be implemented on the surface of the partition 230, for example, as a foil. Preferably, in various embodiments, the first gas barrier is made of metal, a metal alloy, or a metal composite material.

[0050] Figures 3A to 3D An exemplary manufacturing state of the cover structure assembly is schematically shown.

[0051] The unprocessed workpiece is provided in the first step (see...) Figure 3A Workpiece 121 forms the base for end plate 120, with longitudinal axis L, shown in a side view. In the side view of end plate 120, longitudinal axis L extends substantially perpendicular to end plate 120 (not shown).

[0052] In the next step, the workpiece is structured into end plate 120 (see...). Figure 3B For this purpose, the opening region 220 is introduced into the workpiece, for example, by milling and shaping. For example, the recess 202 is configured to receive the separator 230. In particular, the end plate 120 is structured substantially centrally to form the first gas barrier 240. For this purpose, the substantially central region of the end plate 120 is configured such that this region has a thickness smaller than that outside the opening region. The end plate 120 thins to some extent within the opening region 220. This smaller thickness is chosen such that it can be penetrated or pierced by the filling element 300 to fill the cell housing 110. The end plate 120 can serve as a cover for the battery cell and can permanently protect the cell interior from external influences, wherein the first gas barrier 240 hermetically seals the cell 100.

[0053] Alternatively, the end plate 120 can be structured to have a longitudinal axis L about the unit housing 110 (see [reference]). Figure 1 The end plate 120 surrounds the groove 210. The groove 210 has, for example, a triangular cross-section. Similarly, the cross-section can have a semi-circular, rectangular, or other shape. The end plate 120 has a thinner thickness in the region of the groove 210 than the original workpiece 121, and thus can be more easily broken in these regions.

[0054] In the next step, the partition 230 is inserted into the recess 202 (see...). Figure 3C The separator 230 protects the battery cell 100 from air and moisture ingress and from electrolyte solvent evaporation after the electrolyte 190 is filled.

[0055] In the next step, the first support ring 201 is secured to one side of the opening region 220 (see...). Figure 3D The fixing is preferably performed by material locking, for example by welding, such as laser welding or ultrasonic welding. The first support ring 201 is arranged symmetrically about the longitudinal axis L. The surrounding groove 210 is arranged radially outward about the longitudinal axis L than the first support ring 201. Figure 3D The arrangement shown corresponds to Figure 2A The arrangement.

[0056] Alternatively or supplementarily, it is conceivable that the fixing structure component 200 replaces the support ring 203 as a single piece and forms a surrounding groove. Here, the groove is open in one section, allowing the partition 230 to be arranged in the groove.

[0057] In a continuing step (see Figure 4C In this configuration, the opening region 220 is sealed by a second gas barrier 250, which abuts against the first support ring 201 within the opening region 220. This step is performed only after the energy storage unit 100 has been filled with the electrolyte 190. This can be done, for example, after the energy storage unit 100 has been transported from its manufacturing location to its initial use location.

[0058] Figures 4A to 4C An embodiment of a method for filling an energy storage unit 100 is schematically illustrated.

[0059] In the first step (see Figure 4A In the first gas barrier 240 (and, if present, partition 230), the filling element 300 penetrates the gas barrier 240, for example, by piercing it with a hollow needle. The needle pierces the gas barrier 240, thereby creating an opening (filling opening 221) in the end plate 120 through which the electrolyte 190 can be filled into the unit housing 110.

[0060] In the next step, the battery cell is first evacuated and then filled with electrolyte 190 (see [link]). Figure 4B ).

[0061] In a continuing step (see Figure 4C The battery cell 100 is hermetically sealed within the support ring 201. For this purpose, a second gas barrier 250 is disposed on and welded to the support ring 201, for example using laser or ultrasonic welding, or otherwise mechanically connected. Alternatively, the second barrier 250 may be threaded and screwed to the support ring 201. This allows for subsequent filling of the electrolyte 190 and / or solvent, for example, to extend the battery cell's lifespan.

[0062] Figure 5A and 5B The operation of the fixed structure assembly 200 is illustrated schematically.

[0063] During normal operation (see) Figure 5A The end plate 120 is connected to the cell housing 110 of the battery cell 100 and hermetically closes the cell 110. In a safe condition, the end plate 120 may break in the area of ​​the recess 210 and a portion of the end plate 120 may be severed. This allows gas to escape from the cell 100, reducing overpressure and / or critical temperature.

[0064] Although the above description has been set forth and described in detail with reference to embodiments, it is not limited to these embodiments. Rather, those skilled in the art can derive other variations of the specification without departing from the scope of protection defined by the claims.

[0065] List of reference numerals

[0066] 100 battery cells

[0067] 110 Unit Housing

[0068] 120 end plate

[0069] 121 workpiece

[0070] Part of 122 end plate

[0071] 130 base plate

[0072] 140 cover structural components,

[0073] 150 insulating elements

[0074] 160 electrode winding

[0075] 170 positive polarity electrode

[0076] 175 negative polarity electrode

[0077] 180 divider

[0078] 190 electrolyte

[0079] 200 Fixed Configuration Device

[0080] 201 First Support Ring

[0081] 202 concave part

[0082] 203 Second Support Ring

[0083] 210 groove

[0084] 220 opening area, opening

[0085] 221 Filling Opening

[0086] 230 partition

[0087] 231 Filling Opening

[0088] 240 First Gas Barrier

[0089] 250 Second Gas Barrier

[0090] 260 membrane

[0091] 300 filler element

Claims

1. A cover structure assembly (140) for the unit housing (110) of an energy storage unit (100), wherein, The cover structure assembly (140), in its installed state, is configured to enable the filling of the unit housing (110) with an electrolyte (190), wherein the cover structure assembly (140) has: End plate (120), the end plate having a fixing structure assembly (200), the fixing structure assembly having an opening area (220). A first gas barrier (240) is configured to hermetically seal an opening region (220) before the filling unit housing (110) and to allow the filling element (300) to penetrate the filling unit housing (110) such that an opening (221) is formed in the first gas barrier (240) through which the electrolyte (190) can be filled into the unit housing (110); and A second gas barrier (250) is configured to hermetically seal the opening (221) after the filling unit housing (110).

2. The cover structure assembly according to claim 1, wherein, A partition (230) is arranged in the opening region (220) between the first and second gas barrier members (240, 250), and The partition (230) is configured to be penetrated by the filling element (300) for filling the unit housing (110) and is configured to close the opening area (220) after filling the unit housing (110).

3. The cover structure assembly according to any one of the preceding claims, wherein, The first gas barrier (240) and the end plate (120) are implemented as a single unit, and The end plate (120) has a small thickness in the region of the first gas barrier (240), which is configured to hermetically close the opening region (220) before filling the unit housing (110) and to be penetrated by the filling element (300) to fill the unit housing (110), such that the opening (221) is formed in the first gas barrier (240) through which the electrolyte (190) can be filled into the unit housing (110).

4. The cover structure assembly according to any one of the preceding claims, wherein, The first gas barrier (240) and the end plate (120) are implemented separately from each other, and The first gas barrier (240) is inserted into the opening area (220) of the end plate (120).

5. The cover structure assembly according to any one of the preceding claims, wherein, The first gas barrier (240) has a foil, and the foil is arranged on the side of the partition (230) facing the unit housing (110).

6. The cover structure assembly according to any one of the preceding claims, wherein, The first gas barrier (240) comprises metal and / or metal foil.

7. The cover structure assembly (140) according to any one of the preceding claims, wherein, The end plate (120) also has a surrounding groove (210), and The surrounding groove (210) is configured to allow the end plate (120) to break in the region of the groove (210) when a determined overpressure has been reached or exceeded in the unit housing (110), so that the electrolyte (190) can at least partially exit through the broken region.

8. The cover structure assembly (140) according to any one of the preceding claims, wherein, The end plate (120) has a support ring (201) in the region of the first closure element (230), and the support ring (201) is configured to receive and secure the second gas barrier (250).

9. Energy storage unit (100), having: Unit housing (110); Two electrodes (170, 175) are arranged in the unit housing (110). The cover structure assembly (140) according to any one of the preceding claims, wherein, The cover structure assembly (140) is fixed to the unit housing (110) such that the unit housing (110) is closed.

10. A battery module having a plurality of energy storage units (100) according to claim 9.

11. A method for manufacturing an energy storage unit (100), comprising the steps of: Provide unit housing (110). The cover structure assembly (140) with end plates (120) is manufactured in the following manner: The workpiece is structured into a fixed structural component (200), the fixed structural component having an opening region (220), and A first gas barrier (240) is provided, which is configured to hermetically seal the opening region (220) before filling the cell housing (110) and be penetrated by the filling element (300) to fill the cell housing (110) such that an opening (221) is formed in the first gas barrier (240) through which the electrolyte (190) can be filled into the cell housing (110).

12. The method according to claim 11, wherein, A second gas barrier (250) is provided, which is configured to hermetically seal the opening (221) after the filling unit housing (110).

13. A method for transporting an energy storage unit (100), comprising the steps of: Manufacturing the energy storage unit (100) according to claim 11, and The energy storage unit (100) is transported from the manufacturing site to the location where the energy storage unit (100) is further used.

14. A method for filling an energy storage unit (100) manufactured according to claim 11 and / or transported according to claim 13; the method comprising the following steps: The filling element (300) penetrates the first gas barrier (240), wherein the filling element (300) forms an opening (221) in the first gas barrier (240). The cell housing (110) is filled with electrolyte (190) through opening (221 by means of filling element (300), and The opening (221) is sealed airtightly by means of a second gas barrier (250).

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