SYSTEM FOR ACCELERATING THE ELECTROLYTE FILLING OF BATTERY CELLS BY ELECTROLYTE VAPOR PRETREATMENT

Abstract

A system for filling a battery cell with electrolyte comprises an electrolyte filling chamber configured to enclose a battery cell with an electrolyte filling port. A first heating element is configured to heat the electrolyte filling chamber to a predetermined temperature. A vacuum source is configured to maintain a vacuum in the electrolyte filling chamber. A vapor generator is configured to feed vapor from a liquid electrolyte and / or a liquid electrolyte co-solvent into the electrolyte filling chamber for a predetermined period. An electrolyte funnel is configured to fill the battery cell with the liquid electrolyte after the predetermined time. The predetermined temperature is greater than 40 °C and the vacuum is less than 1 bar. The vapor generator is located either inside or outside the electrolyte filling chamber.

Description

INTRODUCTION

[0001] The present disclosure relates to battery cells and in particular to systems and methods for adding electrolyte to battery cells.

[0002] A device for impregnating a leaf-shaped electrode with electrolyte using a porous plunger is known from DE 10 2022 003 928 B3. Furthermore, DE 10 2022 114 793 A1 describes a method for filling a battery cell with electrolyte by placing an electrolyte-containing container onto the battery cell in such a way that an outlet opening formed on the container is fluidically connected to an opening of the battery cell, without the battery cell being enclosed by the container.

[0003] Electric vehicles (EVs), such as battery electric vehicles (BEVs), hybrid vehicles, and / or fuel cell vehicles, comprise one or more electric motors and a battery system with one or more battery cells, modules, and / or packs. A power control system is used to control the charging and / or discharging process of the battery system during charging and / or driving.

[0004] Battery cells comprise cathode electrodes, anode electrodes, and separators arranged within a battery cell casing. The cathode electrodes include a layer of active cathode material arranged on a cathode current collector. The anode electrodes include a layer of active anode material arranged on an anode current collector. After the cathode and anode electrodes, along with the separators, are arranged within the battery cell casing, the casing is enclosed, and liquid electrolyte is added through an electrolyte filling port.

[0005] One of the aims of the invention is to make the manufacturing of a battery cell more efficient. SUMMARY

[0006] This problem is solved by a system having the features of claim 1.

[0007] A system according to the invention for filling a battery cell with electrolyte comprises an electrolyte filling chamber configured to enclose a battery cell with an electrolyte filling opening. A first heating element is configured to heat the electrolyte filling chamber to a predetermined temperature. A vacuum source is configured to control a vacuum in the electrolyte filling chamber. A vapor generator is configured to feed vapor from a liquid electrolyte and / or a liquid electrolyte co-solvent into the electrolyte filling chamber for a predetermined period. A liquid electrolyte funnel is configured to fill the battery cell with the liquid electrolyte after the predetermined time.

[0008] Advantageous further training can be found in the dependent requirements, the following description and the attached drawings.

[0009] In other cases, the predetermined temperature is greater than 40 °C and the vacuum less than 1 bar. The steam generator is located outside the electrolyte filling chamber. The steam generator includes a second heating element to heat the liquid electrolyte and / or the liquid electrolyte co-solvent to a temperature greater than 60 °C. The steam generator includes a container located within the electrolyte filling chamber, which contains the liquid electrolyte and / or the liquid electrolyte co-solvent.

[0010] Other features include a battery cell housing selected from a group consisting of prismatic housings, cylindrical housings, and pouch housings. The predetermined period is longer than 1 minute. A positioning device is designed to align a nozzle of a liquid electrolyte funnel in the electrolyte filling port during filling.

[0011] In other respects, a large number of battery cells are arranged within the electrolyte filling chamber. The vapor is generated from the liquid electrolyte co-solvent. The liquid electrolyte co-solvent is selected from a group consisting of dimethyl carbonate (DMC), ethyl methyl carbonate (EC), diethyl carbonate (DEC), propylene carbonate (PC), and combinations thereof.

[0012] A method for filling a battery cell comprises heating an electrolyte filling chamber to a predetermined temperature, arranging a battery cell with an electrolyte filling port in the chamber, creating a vacuum in the chamber, generating a vapor from a liquid electrolyte and / or a liquid electrolyte co-solvent, supplying the vapor to the chamber for a predetermined period, and filling the battery cell with the liquid electrolyte after the predetermined period.

[0013] For other characteristics, the predetermined temperature is greater than 40 °C and the vacuum less than 1 bar. The process involves generating steam using a steam generator located outside the electrolyte filling chamber. The steam generator heats the liquid electrolyte and / or the liquid electrolyte co-solvent to a temperature greater than 60 °C.

[0014] The method comprises generating the vapor by arranging a container containing the liquid electrolyte and / or the liquid electrolyte co-solvent in the electrolyte filling chamber. The battery cell comprises a casing selected from a group consisting of prismatic casings, cylindrical casings, and pouch casings.

[0015] For other characteristics, the predetermined period is longer than 1 minute. Filling the battery cell with the liquid electrolyte involves lowering a nozzle of an electrolyte funnel into the electrolyte filling opening during filling.

[0016] In other respects, a large number of battery cells are arranged within the electrolyte filling chamber. The vapor is generated from the liquid electrolyte co-solvent. The liquid electrolyte co-solvent is selected from a group consisting of dimethyl carbonate (DMC), ethyl methyl carbonate (EC), diethyl carbonate (DEC), propylene carbonate (PC), and combinations thereof.

[0017] Further applications of the present disclosure will become apparent from the detailed description, the claims, and the drawings. The detailed description and the specific examples serve only for illustration and are not intended to limit the scope of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present disclosure will be better understood from the detailed description and the accompanying drawings, whereby: Fig. 1. A functional block diagram of an example of a battery cell with A anode electrodes, C cathode electrodes, S separators and liquid electrolyte according to the present disclosure is; Fig. 2 a perspective view of an example of a housing for a battery cell according to the present disclosure is, Fig. 3 is a flowchart of an example of a process for filling a battery cell with liquid electrolyte; Fig. 4 a flowchart of an example of a process for pretreating the battery cell with steam before filling the battery cell with liquid electrolyte according to the present disclosure; Fig. 5A and Fig. 5B Functional block diagrams of an example of a system for pretreating the battery cell with steam using a steam generator arranged outside an electrolyte filling chamber prior to filling the battery cell according to the present disclosure; and Fig. 6A and Fig. 6B Functional block diagrams of an example of a system for pretreating the battery cell with steam using a steam generator arranged inside an electrolyte filling chamber prior to filling the battery cell according to the present disclosure.

[0019] Reference symbols may be reused in the drawings to identify similar and / or identical elements. DETAILED DESCRIPTION

[0020] Although the battery cells shown in the present disclosure are in connection with electric vehicles, the battery cells can be used in stationary applications and / or in other applications.

[0021] Electrolyte filling of battery cells is a crucial step in battery manufacturing, improving cell quality and / or avoiding local lithium plating. However, electrolyte filling is time-consuming and costly. In some cases, the electrolyte filling port is small (e.g., < 3 mm in diameter), and the electrolyte filling process takes approximately 24 hours. Accelerating the electrolyte filling process and reducing the wetting time can improve manufacturing efficiency and shorten the aging time.

[0022] General approaches to improving wettability include adjusting the surface tension and viscosity of the electrolyte by adding additives or heating, surface modification of the electrodes and / or separator, generating a vacuum and / or applying an electrochemical potential to generate electrocapillary forces.

[0023] Systems and methods according to this disclosure enable the rapid and uniform filling of battery cells with electrolyte to improve manufacturing efficiency. Prior to electrolyte filling, the battery cells are pretreated with electrolyte vapor or electrolyte-co-solvent vapor. The vapor condenses in the pore surfaces of the battery cells by capillary condensation. The wetted pore surfaces significantly improve the wettability of the battery cells and accelerate the subsequent electrolyte filling process. In some examples, the vapor pretreatment reduces the electrolyte filling time by more than 30% (and in some cases by more than 50%).

[0024] The molecular interaction between the electrolyte or electrolyte co-solvent vapor and the pore surfaces of the battery cell components accelerates subsequent wetting during filling. The vacuum pressure is controlled during vapor exposure to promote capillary condensation and reduce the energy barrier for vapor penetration into the micropores and / or nanopores. In some examples, the amount of added condensed vapor is less than 1 wt% of the total electrolyte to minimize the impact on the electrolyte composition. The large amount of heat generated by the battery cell (which takes a long time to heat up) is used to facilitate solvent condensation at a relatively lower temperature.

[0025] With the following reference to Fig. A battery cell 10 comprises C cathode electrodes 20, A anode electrodes 40, and S separators 32, arranged in a predetermined sequence in a battery cell stack 12, where C, S, and A are integers greater than zero. The C cathode electrodes 20-1, 20-2, ..., and 20-C comprise cathode active material layers 24 arranged on one or both sides of a cathode current collector 26. The A anode electrodes 40-1, 40-2, ..., and 40-A comprise anode active material layers 42 arranged on one or both sides of the anode current collectors 46. In some examples, the A anode electrodes 40 and the C cathode electrodes 20 exchange lithium ions during charging / discharging.

[0026] In some examples, the cathode active material layers 24 and / or the anode active material layers 42 comprise coatings with one or more active materials, one or more conductive additives, and / or one or more binders applied to the current collectors (e.g., by a wet or dry roll-to-roll process), although other manufacturing processes may also be used. In some examples, the cathode current collector 26 and / or the anode current collector 46 comprise metal foil, metal mesh, perforated metal, three-dimensional (3D) metal foam, and / or expanded metal. In some examples, the current collectors are manufactured from one or more materials selected from the group consisting of copper, stainless steel, brass, bronze, zinc, aluminum, and / or their alloys.The outer tabs 28 and 48 are each connected to the current collectors of the cathode electrodes and the anode electrodes and can be arranged on the same or on different sides of the battery cell stack 12. The outer tabs 28 and 48 are connected to the terminals of the battery cells.

[0027] With the following reference to Fig. Figure 2 comprises a battery cell 58 and a battery cell housing 60. In some examples, the housing 60 has a prismatic shape with a rectangular cross-section in the x-, y-, and z-axis planes, although other housing shapes, such as cylindrical housings or pouch housings, may also be used. In some examples, the battery cell housing 60 comprises a housing body 61 with sides 80 corresponding to the narrow faces and sides 82 corresponding to the wide faces. The housing body 61 forms an open, rectangular prism. In some examples, the battery cell housing 60 includes a lid section 84 and a bottom section 86. In other examples, the bottom section 86 is attached after the housing body 61 has been formed. The edges 83 are arranged between sides 80 and 82, between sides 80 and 82 and a lid section 84, and between sides 80 and 82 and the bottom section 86.

[0028] The lid section 84 and, optionally, the bottom section 86 are attached to the housing body 61 to close the upper and lower openings of the housing body 61, respectively. The battery cell 58 includes external terminals 62 and 64 that extend through the lid section 84. The battery cell stack 12, consisting of the C cathode electrodes 20, the A anode electrodes 40, and the S separators 32, is arranged within the battery cell housing 60.

[0029] The outer terminals 62 and 64 are each connected to the outer tabs 28 and 48 of the C cathode electrodes 20 and the A anode electrodes 40, respectively. The cover section 84 (and / or the bottom section 86) includes a pressure-based vent cap 66. The pressure-based vent cap 66 is designed to release vent gases when the pressure inside the inner housing exceeds a predetermined pressure. The cover section 84 includes an electrolyte filling port 91.

[0030] With the following reference to Fig. 3. After the battery cell has been manufactured, electrolyte fluid is typically dispensed into the battery cell housing through the electrolyte filling opening 91 at 110. At 114, the electrolyte filling opening 91 is closed. At 118, the battery cell is stored for a predetermined period to allow it to become saturated. At 122, the battery cell is formed.

[0031] With the following reference to Fig. Figure 4 shows a method for filling a battery cell according to the present disclosure. Before the electrolyte fluid is dispensed at 110, the battery cell is pretreated with electrolyte vapor (either liquid electrolyte or liquid electrolyte co-solvent) for a predetermined period. The vapor exposure wets the inner surfaces of the battery cells and reduces the time required to dispense the electrolyte fluid through the electrolyte filling port 91 into the battery cell housing.

[0032] With the following reference to Fig. 5A and Fig. Figure 5B shows a system for filling one or more battery cells with liquid electrolyte after pretreatment with steam. Fig. In 5A, a steam generator 220 is arranged outside an electrolyte filling chamber 210. The electrolyte filling chamber 210 comprises a lid 210-L and a lower body 210-B. In some examples, a heating element 214 is used to heat the electrolyte filling chamber 210. In some examples, the heating element heats the electrolyte filling chamber 210 to a temperature greater than 40 °C (e.g., 60 °C) to prevent condensation on the walls of the electrolyte filling chamber 210. In some examples, the electrolyte filling chamber 210 is heated before battery cells 212-1, 212-2, ..., and 212-B are arranged in it, where B is an integer greater than zero.

[0033] The B battery cells 212-1, 212-2, ..., and 212-B are arranged in the lower body 210-B of the electrolyte filling chamber 210. The cover 210-L encloses the lower body 210-B. A seal, such as an O-ring seal (not shown), can be arranged between the cover 210-L and the lower body 210-B to provide a vacuum seal.

[0034] A pump or vacuum source 234 empties the electrolyte filling chamber 210 before it is exposed to the steam. In some examples, the electrolyte filling chamber 210 is pumped to a vacuum of less than 1 bar (e.g., 400 mbar) to remove air from the B battery cells 212-1, 212-2, ..., and 212-B. The large amount of heat from the B battery cells 212-1, 212-2, ..., and 212-B causes the internal components of the B battery cells 212-1, 212-2, ..., and 212-B to have a lower temperature to facilitate condensation. The B battery cells 212-1, 212-2, ..., and 212-B are exposed to the steam for a predetermined period. In some examples, the predetermined period is longer than 1 minute.

[0035] The steam generator 220 stores a liquid 226 (liquid electrolyte and / or a liquid electrolyte co-solvent). A heating element 228 may be used to heat the liquid 226 and generate steam. In some examples, the heating element 228 heats the steam generator 220 to a temperature greater than 60 °C. A filling tube 222 may be provided to selectively supply electrolyte to the steam generator 220. The steam is passed through a line 224 and a valve 229 (when open) to deliver steam to the electrolyte filling chamber 210.

[0036] A control unit 240 can be used to control the steam treatment and filling process. The control unit 240 exposes the B battery cells 212-1, 212-2, ..., and 212-B to steam before they are filled with liquid electrolyte. In some examples, the control unit 240 controls the heating element 214 and / or the heating element 228 in response to the temperature sensors 215 and / or 217, respectively. In other examples, the heating element is controlled via an open-loop control system.

[0037] In some examples, the control unit 240 controls the pump or the vacuum source 234 to change the vacuum pressure in the electrolyte filling chamber 210. In some examples, a three-way valve (not shown) may be arranged in the line 232 that connects the electrolyte filling chamber 210 to the pump or the vacuum source 234 or to the atmosphere. In some examples, a pressure sensor (not shown) may be arranged inside the electrolyte filling chamber 210 to provide better control of the vacuum in the electrolyte filling chamber 210.

[0038] A liquid electrolyte funnel 246 stores and distributes the liquid electrolyte 248. The B nozzles 260-1, 260-2, ..., and 260-B extend downwards from the liquid electrolyte funnel 246 and include B valves 250-1, 250-2, ..., and 250-B for controlling the discharge of the liquid electrolyte. The control unit 240 fills the B battery cells with liquid electrolyte after the B battery cells 212-1, 212-2, ..., and 212-B have been exposed to the vapor.

[0039] In some examples, the position of one or both electrolyte filling chambers 210 and / or the liquid electrolyte funnel 246 is adjusted after vapor exposure by a positioning device 270. During filling, the tips of the nozzles 260-1, 260-2, ... and 260-B of the liquid electrolyte funnel 246 are positioned in or immediately adjacent to the electrolyte filling openings 91 (shown in Fig. 2) offset.

[0040] In Fig. 5A The tips of the nozzles 260-1, 260-2, ..., and 260-B of the liquid electrolyte funnel 246 are spaced apart by a predetermined distance above the B battery cells 212-1, 212-2, ..., and 212-B to allow a free flow of vapor into the electrolyte filling ports 91. In Fig. 5B the tips of the nozzles 260-1, 260-2, ..., and 260-B of the liquid electrolyte funnel 246 are arranged in or in the immediate vicinity of the electrolyte filling openings 91 to fill the B battery cells 212-1, 212-2, ..., and 212-B with electrolyte.

[0041] With the following reference to Fig. 6A and Fig. Figure 6B shows a simplified system. The steam generator comprises a container 280, which holds liquid electrolyte 282 and is located in the electrolyte filling chamber 210. The pump or vacuum source 234 empties the electrolyte filling chamber 210, and the heat from the electrolyte filling chamber 210 heats the container 280 with the liquid electrolyte 282 to generate electrolyte vapor. After exposure to the electrolyte vapor for a predetermined period, the vacuum in the electrolyte filling chamber 210 is removed, and the valves 250-1, 250-2, ..., and 250-B supply liquid electrolyte to the B battery cells 212-1, 212-2, ..., and 212-B.

[0042] In Fig. 6A The tips of the nozzles 260-1, 260-2, ..., and 260-B of the liquid electrolyte funnel 246 are spaced apart by a predetermined distance above the B battery cells 212-1, 212-2, ..., and 212-B to allow a free flow of vapor into the electrolyte filling ports 91. In Fig.6B the tips of the nozzles 260-1, 260-2, ..., and 260-B of the liquid electrolyte funnel 246 are arranged in or in the immediate vicinity of the electrolyte filling openings 91 to fill the B battery cells 212-1, 212-2, ..., and 212-B with electrolyte.

[0043] In some examples, the electrolyte co-solvent is selected from a group consisting of dimethyl carbonate (DMC), ethyl methyl carbonate (EC), diethyl carbonate (DEC), propylene carbonate (PC) and combinations thereof.

[0044] The foregoing description serves only for illustration and is not intended to limit the disclosure, its use, or application in any way. It is understood that one or more steps within a process may be carried out in a different order (or simultaneously) without altering the principles of the present disclosure. The described embodiments are not mutually exclusive.

[0045] Spatial and functional relationships between elements (e.g., between modules, circuit elements, semiconductor layers, etc.) are described using various terms, including "connected," "interlocking," "coupled," "adjacent," "next to," "on top of," "above," "below," and "arranged." If a relationship between a first and a second element is not expressly described as "direct" in the above disclosure, this relationship may be a direct relationship in which no other intervening elements exist between the first and the second element, or it may be an indirect relationship in which one or more intervening elements (either spatial or functional) exist between the first and the second element.As used herein, the phrase “A, B and / or C” should be interpreted using a non-exclusive logical OR operation as logical (A OR-connected with B OR-connected with C) and not as “at least one of A, at least one of B and at least one of C”.

[0046] In the figures, the direction of an arrow, as indicated by its tip, generally shows the flow of information (e.g., data or instructions) that is relevant to the illustration. For example, if Element A and Element B exchange a variety of information, but the information transmitted from Element A to Element B is relevant to the illustration, the arrow may point from Element A to Element B. This unidirectional arrow does not mean that no other information is transmitted from Element B to Element A. Furthermore, when information is sent from Element A to Element B, Element B may request the information from Element A or acknowledge its receipt.

[0047] In this application, including the definitions below, the term "module" or "control unit" may be replaced by the term "circuit". The term "module" may refer to, be part of, or include: an application-specific integrated circuit (ASIC); a digital, analog, or mixed analog / digital discrete circuit; a digital, analog, or mixed analog / digital integrated circuit; a combinational logic circuit; a field-programmable gate array (FPGA); a (shared, dedicated, or grouped) processor circuit that executes code; a (shared, dedicated, or grouped) memory circuit that stores code executed by the processor circuit; other suitable hardware components that provide the described functionality; or a combination of some or all of the above components, for example, in a system-on-a-chip.

[0048] The module may include one or more interface circuits. In some examples, the interface circuits may include wired or wireless interfaces connected to a local area network (LAN), the internet, a wide area network (WAN), or combinations thereof. The functionality of any module of this disclosure may be distributed across multiple modules connected via interface circuits. Multiple modules may, for example, enable load balancing. In another example, a server module (also known as a remote or cloud module) may perform some functions on behalf of a client module.

[0049] The term "code," as used above, can include software, firmware, and / or microcode, and can refer to programs, routines, functions, classes, data structures, and / or objects. The term "common processor circuit" refers to a single processor circuit that executes some or all of the code from multiple modules. The term "group processor circuit" refers to a processor circuit that, in combination with other processor circuits, executes some or all of the code from one or more modules. The term "multiple processor circuits" refers to multiple processor circuits on individual dies, multiple processor circuits on a single die, multiple cores of a single processor circuit, multiple threads of a single processor circuit, or a combination of the above.The term shared-memory circuit refers to a single memory circuit that stores some or all of the code from multiple modules. The term group memory circuit refers to a memory circuit that, in combination with additional memory, stores some or all of the code from one or more modules.

[0050] The term memory circuit is a subset of the term computer-readable medium. The term computer-readable medium, as used herein, does not include transient electrical or electromagnetic signals propagating through a medium (e.g., on a carrier wave); the term "computer-readable medium" can therefore be considered tangible and non-transient. Non-restrictive examples of a non-transient, tangible, computer-readable medium are non-volatile memory circuits (such as a flash memory circuit, an erasable programmable read-only memory circuit, or a mask read-only memory circuit), volatile memory circuits (such as a static random-access memory circuit or a dynamic random-access memory circuit), magnetic storage media (such as...an analog or digital magnetic tape or a hard disk drive) and optical storage media (such as a CD, a DVD or a Blu-ray Disc).

[0051] The devices and methods described in this application can be implemented partially or completely by a specialized computer created by configuring a general-purpose computer to perform one or more specific functions embodied in computer programs. The functional blocks, flowchart components, and other elements described above serve as software specifications that can be translated into computer programs through the routine work of a qualified technician or programmer.

[0052] Computer programs comprise processor-executable instructions stored on at least one non-transient, tangible, machine-readable medium. Computer programs may also include or rely on stored data. They may include a basic input / output system (BIOS) that interacts with the hardware of the specialized computer, device drivers that interact with specific devices of the specialized computer, one or more operating systems, user applications, background services, background applications, and so on.

[0053] The computer programs may include: (i) descriptive text to be parsed, e.g. B. HTML (Hypertext Markup Language), XML (Extensible Markup Language), or JSON (JavaScript Object Notation), (ii) assembly code, (iii) object code generated from source code by a compiler, (iv) source code for execution by an interpreter, (v) source code for compilation and execution by a just-in-time compiler, etc. The source code can be written in the syntax of languages ​​such as C, C++, C#, Objective-C, Swift, Haskell, Go, SQL, R, Lisp, Java®, Fortran, Perl, Pascal, Curl, OCaml, Javascript®, HTML5 (Hypertext Markup Language 5th revision), Ada, ASP (Active Server Pages), PHP (PHP: Hypertext Preprocessor), Scala, Eiffel, Smalltalk, Erlang, Ruby, Flash®, Visual Basic®, Lua, MATLAB, SIMULINK, and Python®. Reference symbol list 10 battery cells 12 battery cell stacks 20 Cathode electrode 24 Cathode active material layer 26 Cathode current collector 28 outer flap 32 Separator 40 anode electrode 42 Anode active material layer 46 Anode current collector 48 outer flap 58 battery cells 60 battery cell housings 61 Housing body 62 connection 64 connection 66 Vent cap Page 80 Page 82 83 edge 84 Cover section 86 floor section 91 Electrolyte filling opening 110 Process step 114 Process step 118 Process step 122 Process step 210 Electrolyte filling chamber 210-L lid 210-B lower body 212 battery cell 214 Heating element 215 Temperature sensor 217 Temperature sensor 220 steam generators 222 Filling tube 224 Line 226 Liquid 228 Heating element 229 Valve 232 Line 234 Vacuum source 240 control unit 246 Liquid electrolyte funnels 248 Liquid electrolyte 250 valve 260 nozzle 270 Positioning device 280 containers 282 Liquid electrolyte

Claims

[1] System for filling a battery cell (10, 58, 212-1 - 212-B) with electrolyte, comprising: an electrolyte filling chamber (210) designed to enclose a battery cell (10, 58, 212-1 - 212-B) with an electrolyte filling opening (91); a first heating element (214) designed to heat the electrolyte filling chamber (210) to a predetermined temperature; a vacuum source (234) designed to control a vacuum in the electrolyte filling chamber (210); a steam generator (220) configured to feed steam from a liquid electrolyte (248) and / or a liquid electrolyte co-solvent into the electrolyte filling chamber (210) for a predetermined period; and a liquid electrolyte funnel (246) designed to fill the battery cell (10, 58, 212-1 - 212-B) with the liquid electrolyte (248) after the predetermined period. [2] System according to claim 1, wherein the predetermined temperature is higher than 40 °C and the vacuum is less than 1 bar. [3] System according to claim 1, wherein the steam generator (220) is arranged outside the electrolyte filling chamber (210). [4] System according to claim 3, wherein the steam generator (220) comprises a second heating element (228) to heat the liquid electrolyte (248) and / or the liquid electrolyte co-solvent to a temperature of more than 60 °C. [5] System according to claim 1, wherein the steam generator (220) comprises a container (280) arranged within the electrolyte filling chamber (210) and comprising the liquid electrolyte (248) and / or the liquid electrolyte co-solvent. [6] System according to claim 1, wherein the battery cell (10, 58, 212-1 - 212-B) comprises a housing (60) selected from a group consisting of prismatic housings, cylindrical housings and pouch housings. [7] System according to claim 1, wherein the predetermined period is longer than 1 minute. [8] System according to claim 1, further comprising a positioning device (270) configured to position a nozzle (260-1 - 260B) of the liquid electrolyte funnel (246) in the electrolyte filling opening (91) during filling. [9] System according to claim 1, wherein a plurality of the battery cells (10, 58, 212-1 - 212-B) are arranged in the electrolyte filling chamber (210). [10] System according to claim 1, wherein: the vapor is generated from the liquid electrolyte co-solvent, and The liquid electrolyte co-solvent is selected from a group consisting of dimethyl carbonate (DMC), ethyl methyl carbonate (EC), diethyl carbonate (DEC), propylene carbonate (PC) and combinations thereof.

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