CN115458847A - Battery cell with cover element - Google Patents

Battery cell with cover element Download PDF

Info

Publication number
CN115458847A
CN115458847A CN202210649222.0A CN202210649222A CN115458847A CN 115458847 A CN115458847 A CN 115458847A CN 202210649222 A CN202210649222 A CN 202210649222A CN 115458847 A CN115458847 A CN 115458847A
Authority
CN
China
Prior art keywords
layer
cover element
cover
battery cell
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210649222.0A
Other languages
Chinese (zh)
Inventor
K.S-v.多伦
A.布罗伊尔
D.勃姆
T.B.赫默西洛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volkswagen AG
Original Assignee
Volkswagen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of CN115458847A publication Critical patent/CN115458847A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/155—Lids or covers characterised by the material
    • H01M50/164—Lids or covers characterised by the material having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/155—Lids or covers characterised by the material
    • H01M50/16—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

A battery cell (1) comprising at least a casing (2) and at least one active material block (3) arranged in the casing, wherein the active material block (3) has a plurality of electrodes (4) and separators between different electrodes (4), said electrodes comprising at least one anode, at least one cathode; wherein the housing (2) has a housing part (5) with at least one open end side (6, 7); wherein the end sides (6, 7) are at least partially closed by a cover element (8); wherein the cover element (8) is designed in a multi-layer manner; wherein the first layer (9) oriented towards the active material block (3) and the second layer (11) oriented towards the environment (10) of the battery cell (1) are each made of an electrically conductive material, wherein a third layer (12) is arranged between the first layer (9) and the second layer (11), by means of which the cover element (8) is connected to the housing part (5).

Description

Battery cell with cover element
Technical Field
The invention relates to a battery cell comprising at least a housing and at least one active material block arranged in the housing, wherein the active material block has a plurality of electrodes comprising at least one anode, at least one cathode and a separator between the different electrodes. The active material mass comprises in particular a stack or a coil (e.g. flat coil, circular coil, Z-fold) of at least two electrodes and the separator.
In particular, each active material block has multiple anodes and cathodes and a separator between the different electrodes. The stacked cathode, anode and electrode form a flat, but large-faced mass of active material. Each electrode comprises, in particular, an active material layer arranged on a discharger membrane, wherein the discharger membrane extends with uncoated segments outwardly from the active material block. The uncoated section of the arrester film constitutes the arrester, so that current can be discharged from or supplied to the active material mass. The anode and cathode arresters are respectively interconnected so as to electrically connect corresponding like electrodes in parallel.
Background
Batteries, in particular lithium ion batteries, are increasingly used for driving motor vehicles. Batteries are typically constructed of battery cells and/or of battery modules including a plurality of battery cells.
The active material blocks are arranged individually or in groups in the housing and thus constitute a battery cell. In particular, the most efficient use of installation space should be achieved here. Here, the Wh/l [ watt-hours per liter ] value is an important characteristic value of the battery cell. In the present configuration of prismatic units, a certain proportion of the housing volume can be used for the unit winding/unit stack.
In the current design of battery cells, the cell stack/cell winding or active material mass is arranged within a deep-drawn housing part. The deep drawn housing part is connected to a cover group, which usually has a current collector for contacting an electrode-type arrester, a receiving grid for receiving the current collector and electrically insulating it with respect to the housing part, a terminal for providing electrical contact of the current collector with the environment of the battery cell, and an insulator for insulating the terminal with respect to the housing.
The arrangement of the cover as a constituent part of the housing, the connection of the arrester to the current collector and the outward guidance of the electrical contacts through the cover require installation space.
A battery having a housing and a cover for closing the housing is known from patent document US 10,290,841 B2. The lid has three layers, two layers made of plastic and one layer being a metal layer.
A battery having a housing and a cover for closing the housing is known from patent document US 10,707,461 B2. The lid has three layers, two metal layers and one plastic layer.
A prismatic battery cell with a casing is known from the patent document US 2004/0061476 A1. The housing is closed on the narrow side by a cover.
Disclosure of Invention
The technical problem underlying the present invention is to solve, at least in part, the problems mentioned with regard to the prior art. In particular, a battery cell is to be proposed, which enables an efficient use of the space of the housing by means of the cover element. In particular, the complexity of the cover element is reduced and at the same time the tightness of the battery cell is ensured, in particular when the electrical contacts are guided through the cover element.
The object is achieved by a battery cell according to the invention, comprising at least a housing and at least one active material block arranged in the housing, wherein the active material block has a plurality of electrodes and separators between the different electrodes, the electrodes comprising at least one anode and at least one cathode; wherein the housing has a cover section with at least one open end side; wherein the end side is at least partially closed by a cover element; wherein the cover element is designed in multiple layers; wherein a first layer oriented towards the active material mass and a second layer oriented towards the environment of the battery cell are each made of an electrically conductive material, wherein a third layer is arranged between the first and second layers, through which third layer the cover element is connected with the outer cover part; wherein a first intermediate layer is arranged between the first layer and the third layer, and a second intermediate layer is arranged between the second layer and the third layer, the first intermediate layer and the second intermediate layer being made of an electrically non-conductive material, respectively; wherein at least one electrically conductive connecting element extends in a radial direction through the cover element and from the first layer to the second layer in order to electrically conductively connect the first layer with the second layer.
The object is achieved by a cover element according to the invention for a battery cell according to the invention, wherein the cover element is designed in a multi-layer manner.
Advantageous further embodiments include at least one of the following features:
at least the at least one anode or the at least one cathode is conductively connected to the first layer;
at least the at least one anode or the at least one cathode can be electrically conductively connected to a circuit arranged outside the battery cell via the cover element;
the third layer is arranged in the cover element electrically insulated with respect to the at least one connection element and with respect to the first and second layers;
the at least one connecting element is connected with the first layer and with the second layer material in an engaging manner or in a form-fitting manner relative to the radial direction;
the third layer is adhesively connected with the outer cover material;
the cover element has an overpressure valve;
at least the first intermediate layer or the second intermediate layer is composed of a fluororubber, PTFE, PFA, or ceramic;
the cover part is an extruded profile or is produced by impact extrusion.
The features mentioned individually in the description can be combined with one another in a technologically meaningful manner and can be supplemented by explanatory facts in the description and/or details in the drawings, in which further embodiment variants of the invention are shown.
A battery cell is suggested that includes at least a housing and at least one active material block disposed in the housing. The active material mass has a plurality of electrodes including at least one anode and at least one cathode and a separator between the different electrodes. The housing has a cover section with at least one open end side. The end side is at least partially closed by a cover element. The cover element is designed in multiple layers. The first layer of the cover element oriented towards the block and the second layer of the cover element oriented towards the environment of the battery cell are each made of an electrically conductive material. A third layer is arranged between the first layer and the second layer, by means of which third layer the cover element is connected to the outer cover part. A first intermediate layer is arranged between the first layer and the third layer, and a second intermediate layer is arranged between the second layer and the third layer, the first and second intermediate layers each being made of a non-conductive material. At least one electrically conductive connecting element extends in the radial direction through the cover element and from the first layer up to the second layer in order to electrically conductively connect the first layer to the second layer.
The active material mass comprises in a known manner, in particular, at least one anode and at least one cathode as electrodes. Separators are disposed between the anode and the cathode, respectively. The active material is arranged, in particular, as a coating on an electrically conductive carrier material, which is used, in particular, as an arrester. The anode, the cathode and the separator are in particular respectively referred to as layers, which are arranged one above the other.
The active material mass may also be designed as a pouch-like cell (or soft-pack cell), i.e. the own housing of the pouch-like cell is arranged in the housing described herein comprising the cover and the core. The pouch-like cell comprises a deformable shell consisting of a pouch-like membrane and is therefore just not a prismatic cell (with a shape-stable shell). A pouch-like membrane is a known deformable housing member which serves as a housing of a so-called pouch-like cell. The bag-like film is a composite material, which for example comprises plastic and aluminium.
The electrodes are arranged in particular in a known manner to constitute an active material mass and are acted upon by an electrolyte or electrolyte.
In particular, the active material block has a plurality of electrodes and separators, which are arranged one above the other or stacked and then co-wound. The layers may be arranged in any number of single sheet stacks, laminae, Z-folds, jelly rolls (Jelly Roll), respectively.
The electrodes are in particular designed as a membrane, i.e. with a large lateral surface and a small thickness. A coating with an active material is arranged in particular on one or each side of the electrode. The separators are respectively disposed between the sides of the different electrodes disposed adjacently. In particular, the uncoated portion of the electrode extends from the active material mass as a discharger.
In particular, the anodes and cathodes are connected in parallel to one another in each case within the active material block or in the housing, so that the arresters of a plurality of anodes are connected to one another in an electrically conductive manner and the arresters of a plurality of cathodes are connected to one another in an electrically conductive manner.
The housing of the battery cell can be deformed only plastically. The housing is also referred to as a hard case, and the battery cell is, for example, referred to as a prismatic cell.
The battery cell is in particular a lithium-containing battery cell, in particular a secondary cell, i.e. a rechargeable battery cell.
The housing is designed in particular in one piece in the ready-to-use battery unit. The housing is formed at least by a cover part and the at least one cover element, which are connected to one another only during the manufacture of the housing, but which were previously present as separate components.
The outer cup is in particular designed as a cylinder or cylinder, i.e. has only faces which extend parallel to the axial direction.
In particular, aluminum or aluminum alloys or other materials can also be used as the material for the housing or the cover. The materials used here should have, in particular, a good thermal conductivity, which is preferably comparable to or higher than that of aluminum.
The cover part can be designed in one piece or in several pieces. The cover part has in particular at least one open end side. The end side is at least partially closed by a cover element. The cover element is designed in multiple layers. The individual layers extend in particular parallel to one another and preferably parallel to the open end face. A first layer is arranged on the side of the cover element oriented towards the block. A second layer of the cover element is arranged on the opposite side of the cover element oriented towards the environment of the battery cell. The first and second layers are each made of an electrically conductive material.
Between the first layer and the second layer, in particular, a third layer is arranged, by means of which the cover element is connected to the housing part. In particular, the cover element is connected to the housing part only via the third layer. In particular, only the third layer is configured as a first connection portion which engages with the material of the cover portion.
A first intermediate layer is arranged in particular between the first layer and the third layer, and a second intermediate layer is arranged between the second layer and the third layer, the first and second intermediate layers each being made of a non-conductive material. The third layer is electrically insulated from the other electrically conductive parts of the cover element by these intermediate layers.
At least one electrically conductive connecting element extends in the radial direction through the cover element and from the first layer up to the second layer in order to electrically conductively connect the first layer to the second layer.
The housing is in particular substantially cuboid. The largest side of the housing extends in particular parallel to the largest side of the electrodes of the block. The largest sides are spaced from each other by four circumferential surfaces. In particular, two circumferential surfaces lying opposite one another are designed to have the same dimensions. The pairs of circumferential surfaces thus produced have in particular different dimensions. The at least one cover element is arranged in particular on one of the smallest circumferential surfaces. Alternatively, the at least one cover element is arranged in particular on the largest circumferential surface. In particular, the largest side of the housing is formed by the housing part. In particular, additionally, at least two or even three circumferential surfaces are formed by the cover part.
In particular, at least the at least one anode or the at least one cathode is electrically conductively connected to the first layer. In particular, all anodes or all cathodes of at least one block are electrically conductively connected to the first layer. The electrodes are connected to the first layer, in particular via their arresters. The connection is designed in particular as a material-bonded connection. The material-bonded connection can be produced in particular by soldering or welding, in particular laser welding.
In particular, the same type of electrode arrester of the at least one block extends from a side face of the block. In particular, the arresters are joined together and arranged one above the other. The arresters arranged in this way can be connected jointly or also individually to the first layer in a bonded manner. Here, the cover element can still be provided as a separate component and separately from the housing part.
In particular, the cover element is arranged on the housing part and connected to it only after the arrester has been connected to the first layer.
In particular, at least the at least one anode or the at least one cathode can be connected in an electrically conductive manner to a circuit arranged outside the battery cell via the cover element. In particular, the electrically conductive contacting of the circuit is realized by the second layer.
In particular, the third layer is arranged in the cover element electrically insulated with respect to the connecting element and with respect to the first layer and the second layer. In particular, the cover element is connected to the housing part only via the third layer, i.e. neither via the first layer nor via the second layer.
In particular aluminum or aluminum alloys, copper or copper alloys or other materials can also be used as materials for the first and second layers and for the connecting elements. The materials used here should in particular have a good electrical conductivity, which is preferably comparable to or higher than the conductivity of aluminum.
In particular, the material for the third layer should be chosen in particular to be suitable for the material of the cover part, at least for the first connecting portion with which the material of the cover part is joined. In particular, the material of the third layer corresponds to the material of the cover part.
In particular, the cover part is arranged electrically insulated with respect to the connection element and with respect to the first and second layer.
In particular, the at least one connecting element is connected in a positive-locking manner to the first layer and to the second layer material or relative to the radial direction.
The connecting element can be designed, for example, as a bolt. The bolt can be designed substantially symmetrically in the radial direction. The bolt can also be designed, for example, rotationally symmetrically about an axis of the connecting element extending in the radial direction.
The connecting element can, for example, be inserted into an opening in the cover element, which opening is provided for receiving the connecting element. The opening is designed in particular as a through-hole in the cover element, and is thus provided as an opening in each of the layers of the multilayered cover element. The connecting element may be arranged in the opening by press fitting. The connecting element should ensure, in particular, an electrically conductive contact between the first layer and the second layer.
The connecting element can be connected to the first layer and/or to the second layer by soldering or welding, i.e. by a second connection. Alternatively or additionally, the connection element may be connected to the layer by a third connection which is form-fit with respect to the radial direction. For example, the connecting element can be deformed at least at one end, for example in the manner of a rivet, after being arranged in the opening, in order to achieve a form fit.
The cover element may have one or more connecting elements. The geometry and/or the material of the connecting elements and/or the number of connecting elements can be selected as appropriate, in particular with regard to the properties, such as the wire cross-section, the electrical conductivity, etc., which ensure as efficient a conduction of the electrical current as possible.
The overpressure valve can also be constructed from a connecting element.
In particular, the third layer is connected in a bonded manner to the covering material. In particular, the first connection between the third layer and the cover part constitutes an airtight connection.
In particular, the cover element has an overpressure valve. The overpressure valve should be able to reduce the overpressure occurring in the battery cell, in particular during operation of the battery cell. The overpressure valve is designed in the type of a rupture opening, i.e. the rupture opening cannot be closed again after the initial opening. Alternatively, the overpressure valve can be designed as a re-closable valve.
In particular, at least the first intermediate layer or the second intermediate layer is composed of a fluoroelastomer, PTFE (polytetrafluoroethylene), PFA (perfluoroalkoxy polymer, i.e. perfluoroplastic, copolymer of Tetrafluoroethylene (TFE) and perfluoroalkoxy vinyl ether, such as perfluorovinyl ether) or of a ceramic.
In particular PTFE and PFA are gas-tight and thus can ensure that no or only a small amount of electrolyte can diffuse from the casing into the environment.
In particular, the housing part also has at least one open second end face, in particular opposite the first end face, which is closed by a further multi-layered cover element.
In particular, the outer mantle section is an extruded profile, i.e. produced by extrusion or deep drawing.
In the extrusion process, the raw material is heated to a deformation temperature and extruded through a forming die using high pressure. The profile thus produced is moved further from the die in the direction of feed.
During the impact extrusion, in particular the base of the component produced is separated and thus forms the cover.
A cover element for the battery cell described is also proposed, wherein the cover element is designed in a multilayer manner.
Battery cells can be used in particular in motor vehicles in order to store electrical energy. In particular, battery units are used in motor vehicles to supply electric energy to traction drives.
The description relating to the battery cell applies in particular also to the cover element and to the motor vehicle, and the description relating to the cover element and to the motor vehicle applies in particular also to the battery cell.
The use of the indefinite articles "a" and "an" in particular in the specification should be understood as such and not as a word of art. Accordingly, terms or components introduced accordingly by way of this should be understood such that they occur at least once and in particular also several times.
It should be noted that the numbers ("first", "second", etc.) used herein are used primarily (only) to distinguish one object, dimension, or process from another, and thus do not particularly impose a requirement on the relevance and/or order of such objects, dimensions, or processes to one another. Where a dependency and/or order is required, it may be explicitly stated herein or may be apparent to one of ordinary skill in the art in view of the specifically described design. If a component can appear multiple times ("at least one"), then the description of one of the components can apply equally to all or most of the components, but this is not mandatory.
Drawings
The invention and the technical environment are explained in more detail below with reference to the drawings. It should be noted that the present invention should not be limited by the illustrated embodiments. In particular, if not explicitly stated otherwise, parts of the facts described in the figures may also be extracted and combined with other constituent parts and knowledge in the specification. It should be noted in particular that the drawings and the dimensional ratios shown in particular are purely schematic. In the drawings:
fig. 1 shows a plan view of an electrode with a discharger;
fig. 2 shows a side view of the battery cell during assembly;
fig. 3 shows a side view of the battery unit according to fig. 2 after assembly;
fig. 4 shows a plan view of a first embodiment variant of the cover element;
fig. 5 shows a side view of the cover element according to fig. 4;
FIG. 6 shows a detail of FIG. 5;
fig. 7 shows a plan view of a second embodiment variant of the cover element;
fig. 8 shows a side view of the cover element according to fig. 7;
fig. 9 shows a top view of a third embodiment variant of the cover element;
fig. 10 shows a side view of the cover element according to fig. 9;
fig. 11 shows a top view of a fourth embodiment variant of the cover element;
fig. 12 shows a side view of the cover element according to fig. 11; and
fig. 13 shows a detail of fig. 12.
Detailed Description
Fig. 1 shows a plan view of an electrode 4 with a discharger 19. The electrode 4 has a coated region and an uncoated region. The electrode 4 is designed as a membrane, i.e. with a large lateral surface and a small thickness. A coating with an active material is arranged on one or each side of the electrode 4. The uncoated part of the electrode 4 serves as a discharger 19.
Fig. 2 shows a side view of the battery unit 1 during assembly. Fig. 3 shows a side view of the battery unit 1 according to fig. 2 after assembly. Fig. 4 shows a plan view of a first embodiment variant of the cover element 8. Fig. 5 shows a side view of the cover element 8 according to fig. 4. Fig. 6 shows a detail of fig. 5. Fig. 2 to 6 are collectively described below.
The battery unit 1 includes a housing 2 and at least one active material block 3 disposed therein. The active material block has a plurality of electrodes 4 including an anode and a cathode and separators respectively between the different electrodes 4. The housing 2 has a cover 5 with two open end sides 6, 7. The end sides 6, 7 are each closed by a cover element 8.
The anodes and cathodes are each connected in parallel to one another in the housing 2, so that the arresters 19 of the anodes are connected to one another in an electrically conductive manner and the arresters 19 of the cathodes are connected to one another in an electrically conductive manner. The arresters 19 of the electrodes 4 of the same type of block 3 each extend from a side of the block 3 opposite the respective end side 6, 7. The arresters 19 are joined together and arranged one above the other. The arresters 19 arranged in this way are connected together in a bonded manner to the first layer 9 of the respective cover element 8. At this time, the cover element 8 is still provided as a separate component and separately from the housing part 5 (see fig. 2).
After the arrester 19 has been connected to the first layer 9, each cover element 8 is arranged on and connected to the housing part 5 (see fig. 3).
The electrodes 4 can be connected in an electrically conductive manner to an electrical circuit 17 (shown in fig. 3) arranged outside the battery cell 1 via the respective cover element 8. The electrically conductive contacting of the circuit 17 is realized by the second layer 11.
The housing 2 is designed in one piece in the ready-to-use battery unit 1 (see fig. 3). The housing 2 is formed by an outer shell part 5 and two cover elements 8. The outer cup 5 is cylindrical in design, i.e. has only faces extending parallel to the axial direction 20.
The housing 2 is designed as a cuboid. The largest side of the housing 2 extends parallel to the largest side of the electrode 4 of the block 3, i.e. transversely to the axial direction 20 and parallel to the radial direction 16. The largest sides are spaced from each other by four circumferential surfaces. Two circumferential surfaces lying opposite one another are each designed with the same dimensions. The pairs of circumferential surfaces thus produced have different dimensions. The cover element 8 is arranged on the end sides 6, 7 formed by the smallest circumference.
The outer cup 5 is designed in one piece. The cover part has two open end sides 6, 7. The end sides 6, 7 are closed by a cover element 8.
The cover element 8 is designed in multiple layers. The individual layers 9, 11, 12 of the cover element 8 run parallel to one another and to the end sides 6, 7. On the side of the cover element 8 oriented towards the block 3, a first layer 9 is arranged. On the opposite side of the cover element 8, which is oriented towards the environment 10 of the battery unit 1, a second layer 11 of the cover element 8 is arranged. The first layer 9 and the second layer 11 are each made of an electrically conductive material.
Between the first layer 9 and the second layer 11, a third layer 12 is arranged, by means of which the cover element 8 is connected to the outer mantle section 5. A first intermediate layer 13 is arranged between the first layer 9 and the third layer 12, and a second intermediate layer 14 is arranged between the second layer 11 and the third layer 12, the first and second intermediate layers each being made of a non-conductive material. Two electrically conductive connecting elements 15 extend in the radial direction 16 through the cover element 8 and from the first layer 9 to the second layer 11 in order to electrically conductively connect the first layer 9 to the second layer 11.
Between the first layer 9 and the second layer 11, a third layer 12 is arranged, by means of which the cover element 8 is connected to the outer mantle section 5. The cover element 8 is connected to the cover part 5 only via the third layer 12. Here, only the third layer 12 constitutes the first connecting portion 21 to be joined to the material of the outer cover portion 5.
The third layer 12 is electrically insulated from the other electrically conductive parts of the cover element 8 by the intermediate layers 13, 14.
The third layer 12 is arranged in the cover element 8 electrically insulated with respect to the connection element 15 and with respect to the first layer 9 and the second layer 11. The cover element 8 is connected to the cover part 5 only via the third layer 12, i.e. neither via the first layer 9 nor via the second layer 11. The third layer 12 is connected to the cover 5 in a bonded manner. The first connection 21 between the third layer 12 and the cover part 5 constitutes an airtight connection.
The cover 5 is arranged electrically insulated relative to the connecting element 15 and relative to the first layer 9 and the second layer 11.
The connecting element 15 is connected to the first layer 9 and to the second layer 11 in a bonded manner.
The connecting elements 15 are each designed as a bolt. The bolt is designed substantially symmetrically in the radial direction 16. The bolt is also designed to be rotationally symmetrical about an axis of the connecting element 15 extending in the radial direction 16.
The connecting element 15 is arranged in an opening in the cover element 8, which opening is provided for accommodating the connecting element 15. The openings are designed as through-holes in the cover element 8 and are thus provided as openings in each layer 9, 11, 12, 13, 14 of the multi-layered cover element 8. The electrically conductive contact between the first layer 9 and the second layer 11 is ensured by the connecting element 15.
The connecting element 15 is connected to the first layer 9 and to the second layer 11 by a materially bonded second connecting portion 22.
The cover element 8 has an overpressure valve 18. During operation of the battery unit 1, the overpressure generated in the battery unit 1 can be reduced by the overpressure valve 18. The overpressure valve 18 is designed in the form of a rupture opening, which therefore cannot be closed again after the initial opening.
Fig. 7 shows a plan view of a second embodiment variant of the cover element 8. Fig. 8 shows a side view of the cover element 8 according to fig. 7. Fig. 7 and 8 are collectively described below. Reference is made herein to the description relating to fig. 1 to 6.
In contrast to the first embodiment variant, the connection element 15 is connected to the layers 9, 11, 12, 13, 14 by a third connection 23 that is form-fit with respect to the radial direction 16. For this purpose, the connecting element 15 is shaped at both ends, for example in the manner of a rivet, in order to achieve a form fit. The second connection 22 of the material bond between the connection element 15 and the respective layer 9, 11 is not required here.
Fig. 9 shows a plan view of a third embodiment variant of the cover element 8. Fig. 10 shows a side view of the cover element 8 according to fig. 9. Fig. 9 and 10 are collectively described below. Reference is made herein to the description relating to figures 1 to 8.
In contrast to the first and second embodiment variants, the cover element 8 has only one connecting element 15. However, the connecting element extends over a large surface area over a large partial region of each individual layer 9, 11, 12, 13, 14. As in the first embodiment variant, the connecting element 15 is connected to the first layer 9 and the second layer 11 in each case in a bonded manner.
The excess-pressure valve 18 is formed by the connecting element 15.
Fig. 11 shows a top view of a fourth embodiment variant of the cover element 8. Fig. 12 shows a side view of the cover element 8 according to fig. 11. Fig. 13 shows a detail of fig. 12. Fig. 11 to 13 are collectively described below. Reference is made herein to the description relating to fig. 4 to 6.
In contrast to the first embodiment variant, the connecting element 15 is designed in a rotationally asymmetrical manner.
List of reference numerals
1. Battery unit
2. Shell body
3. Block body
4. Electrode for electrochemical cell
5. Outer cover part
6. First end side
7. Second end side
8. Cover element
9. First layer
10. Environment(s)
11. Second layer
12. Third layer
13. A first intermediate layer
14. A second intermediate layer
15. Connecting element
16. Radial direction
17. Circuit arrangement
18. Overpressure valve
19. Discharge vessel
20. Axial direction
21. First connecting part
22. Second connecting part
23. Third connecting part

Claims (10)

1. A battery cell (1) comprising at least a casing (2) and at least one active material block (3) arranged in the casing, wherein the active material block (3) has a plurality of electrodes (4) and separators between different electrodes (4), said electrodes comprising at least one anode and at least one cathode; wherein the housing (2) has a cover (5) with at least one open end side (6, 7); wherein the end sides (6, 7) are at least partially closed by a cover element (8); wherein the cover element (8) is designed in a multi-layer manner; wherein the first layer (9) oriented towards the active material block (3) and the second layer (11) oriented towards the environment (10) of the battery cell (1) are each made of an electrically conductive material, wherein a third layer (12) is arranged between the first layer (9) and the second layer (11), by means of which the cover element (8) is connected to the housing part (5); wherein a first intermediate layer (13) is arranged between the first layer (9) and the third layer (12), and a second intermediate layer (14) is arranged between the second layer (11) and the third layer (12), the first and second intermediate layers each being made of an electrically non-conductive material; wherein at least one electrically conductive connecting element (15) extends in a radial direction (16) through the cover element (8) and from the first layer (9) to the second layer (11) in order to electrically conductively connect the first layer (9) to the second layer (11).
2. The battery cell (1) according to claim 1, wherein at least the at least one anode or the at least one cathode is electrically conductively connected with the first layer (9).
3. The battery unit (1) according to any of the preceding claims, wherein at least the at least one anode or the at least one cathode is conductively connectable with an electrical circuit (17) arranged outside the battery unit (1) through the cover element (8).
4. The battery cell (1) according to any one of the preceding claims, wherein the third layer (12) is arranged in the cover element (8) electrically insulated with respect to the at least one connection element (15) and with respect to the first layer (9) and the second layer (11).
5. The battery cell (1) according to any one of the preceding claims, wherein the at least one connecting element (15) is connected with the first layer (9) and with the second layer (11) in a material-bonded or form-fitting manner with respect to a radial direction (16).
6. The battery unit (1) according to any one of the preceding claims, wherein the third layer (12) is connected in a material-bonded manner with the cover part (5).
7. The battery unit (1) according to any one of the preceding claims, wherein the cover element (8) has an overpressure valve (18).
8. The battery cell (1) according to any one of the preceding claims, wherein at least the first intermediate layer (13) or the second intermediate layer (14) is composed of a fluoroelastomer, PTFE, PFA or of a ceramic.
9. The battery unit (1) according to any one of the preceding claims, wherein the cover part (5) is an extruded profile or manufactured by impact extrusion.
10. Cover element (8) for a battery cell (1) according to one of the preceding claims, wherein the cover element (8) is designed as a multilayer.
CN202210649222.0A 2021-06-09 2022-06-09 Battery cell with cover element Pending CN115458847A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021114887.1 2021-06-09
DE102021114887.1A DE102021114887A1 (en) 2021-06-09 2021-06-09 Battery cell with cover element

Publications (1)

Publication Number Publication Date
CN115458847A true CN115458847A (en) 2022-12-09

Family

ID=84192840

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210649222.0A Pending CN115458847A (en) 2021-06-09 2022-06-09 Battery cell with cover element

Country Status (2)

Country Link
CN (1) CN115458847A (en)
DE (1) DE102021114887A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013000416A1 (en) * 2011-06-28 2013-01-03 Shenzhen Byd Auto R & D Company Limited Cover assembly and lithium ion battery comprising the same
CN107039606A (en) * 2017-06-13 2017-08-11 四川南光新能源有限公司 A kind of lithium battery
CN111224022A (en) * 2018-11-23 2020-06-02 常州微宙电子科技有限公司 Lithium ion battery and double-sided insulating metal cover plate thereof
CN111525051A (en) * 2020-04-30 2020-08-11 蜂巢能源科技有限公司 Battery core cover plate, battery module and vehicle
CN111916584A (en) * 2020-07-02 2020-11-10 欣旺达电动汽车电池有限公司 Lithium ion battery top cover assembly and lithium ion battery

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4166063B2 (en) 2002-09-18 2008-10-15 松下電器産業株式会社 Square battery
US10290841B2 (en) 2012-01-31 2019-05-14 Johnson Controls Technology Company Cover for battery cell
DE102017104711A1 (en) 2017-03-07 2018-09-13 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Automotive high-voltage energy storage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013000416A1 (en) * 2011-06-28 2013-01-03 Shenzhen Byd Auto R & D Company Limited Cover assembly and lithium ion battery comprising the same
CN107039606A (en) * 2017-06-13 2017-08-11 四川南光新能源有限公司 A kind of lithium battery
CN111224022A (en) * 2018-11-23 2020-06-02 常州微宙电子科技有限公司 Lithium ion battery and double-sided insulating metal cover plate thereof
CN111525051A (en) * 2020-04-30 2020-08-11 蜂巢能源科技有限公司 Battery core cover plate, battery module and vehicle
CN111916584A (en) * 2020-07-02 2020-11-10 欣旺达电动汽车电池有限公司 Lithium ion battery top cover assembly and lithium ion battery

Also Published As

Publication number Publication date
DE102021114887A1 (en) 2022-12-15

Similar Documents

Publication Publication Date Title
EP2750241B1 (en) Electrode assembly having stepped levels and battery cell, battery pack, and device comprising same
KR100648731B1 (en) Secondary battery and the fabrication method thereof
JP5275298B2 (en) Secondary battery
US7544440B2 (en) Secondary battery having a sealing gasket with concave and convex portions
EP3696874A1 (en) Secondary battery
KR100786875B1 (en) Battery module
CN1998101A (en) Low impedance layered battery apparatus and method for making the same
KR100919691B1 (en) Unit cell for secondary battery having conductive sheet layer and lithium ion secondary battery having the same
US4957830A (en) Rechargeable metal oxide-hydrogen battery
KR100776766B1 (en) Battery having upper terminal
US20130130099A1 (en) Secondary battery of differential lead structure
US20120282504A1 (en) Secondary Battery And Cover Assembly Employed Therein
KR100913174B1 (en) Battery module
KR20050103645A (en) Secondary battery
JP2993069B2 (en) Sealed battery pack
JP2010525552A (en) Electrochemical unit cell and energy storage device with welding point connection
US8586223B2 (en) Cylindrical secondary battery
KR101515672B1 (en) Electrode assembly including anode and cathod electrode more than 2 and electrochemical device using the same
WO2017153490A1 (en) Electrode assembly and battery cell
EP4125151A1 (en) Secondary battery
CN115458847A (en) Battery cell with cover element
KR100754918B1 (en) Battery having side terminal
CN110770963A (en) Electrode assembly for battery module
CN107978761B (en) Current collector for an energy storage cell for storing electrical energy
EP3133675B1 (en) Secondary battery

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination